/* ─── Variables ─────────────────────────────────────────────────────────── */
:root {
  /* Apex — EdTech profesional (azul institucional + grises) */
  --bg:       #f8fafc;
  --panel:    #ffffff;
  --surface:  #f1f5f9;
  --surface2: #e8eef5;
  --border:   #e2e8f0;
  --text:     #1e293b;
  --muted:    #475569;
  --accent:   #2563eb;
  --accent2:  #3b82f6;
  --primary:  #2563eb;
  --primary-glow: rgba(37,99,235,.15);
  --grad:     linear-gradient(135deg,#2563eb,#3b82f6);
  --success:  #16a34a;
  --warning:  #d97706;
  --danger:   #dc2626;
  --radius:   12px;
  --sidebar:  270px;
  --font-display: "Montserrat", -apple-system, system-ui, sans-serif;
  /* Sombras tenues y controladas (Fase 3) */
  --shadow:   0 1px 3px rgba(0,0,0,.05);
  --shadow-lg:0 4px 12px rgba(0,0,0,.07);
  /* Acentos por herramienta */
  --t-chat:     #6d4aff;
  --t-flash:    #d98a2b;
  --t-quiz:     #12a572;
  --t-practice: #0e9488;
  --t-exam:     #d6634a;
  --t-live:     #7c63ff;
  --t-hw:       #6d4aff;
  --t-summary:  #5a7bf0;
  --t-mindmap:  #9b5cf6;
  --t-essay:    #d6478a;
  --t-classes:  #0c91a8;
  --t-grapher:  #22d3ee;
  --t-calendar: #f59e0b;
  --t-analytics:#34d399;
  --tint-ok:    #e7f7f0;
  --tint-bad:   #fdecec;
}
/* ─── Tema oscuro ───────────────────────────────────────────────────────── */
html[data-theme="dark"]{
  /* Apex — alineado con apexs.base44.app (navy profundo + cian neón + índigo + oro) */
  --bg:       #080d21;
  --panel:    #0e142a;
  --surface:  rgba(255,255,255,0.04);
  --surface2: rgba(255,255,255,0.07);
  --border:   rgba(120,150,210,0.16);
  --border2:  rgba(120,150,210,0.26);
  --text:     #f7fafd;
  --muted:    #8a99b3;
  --accent:   #00eaff;
  --accent2:  #6467f2;
  --primary:  #00eaff;
  --gold:     #ffcc00;
  --primary-glow: rgba(0,234,255,.28);
  --grad:     linear-gradient(135deg,#00eaff,#6467f2);
  --grad2:    linear-gradient(135deg,#6467f2,#00eaff);
  --success:  #34d399;
  --warning:  #ffcc00;
  --danger:   #f87171;
  /* Glass morphism */
  --glass:    rgba(14,20,42,0.72);
  --glass-border: rgba(120,150,210,0.14);
  --blur:     blur(18px) saturate(160%);
  /* Shadows — OLED deep */
  --shadow:   0 1px 3px rgba(0,0,0,.7), 0 6px 24px rgba(0,0,0,.5);
  --shadow-lg:0 2px 10px rgba(0,0,0,.7), 0 24px 64px rgba(8,13,33,.6);
  --shadow-glow: 0 0 0 1px rgba(0,234,255,.30), 0 4px 24px rgba(0,234,255,.22);
  --tint-ok:  rgba(52,211,153,.15);
  --tint-bad: rgba(248,113,113,.15);
  /* Ambient blob colors */
  --blob1:    rgba(0,234,255,.12);
  --blob2:    rgba(100,103,242,.12);
  --blob3:    rgba(255,204,0,.05);
  --t-chat:#4f7cff; --t-flash:#fbbf3a; --t-quiz:#34d399; --t-practice:#2dd4bf;
  --t-exam:#f87171; --t-live:#22d3ee; --t-hw:#3b82f6; --t-summary:#7c9bff;
  --t-mindmap:#b08bff; --t-essay:#f06aa6; --t-classes:#22d3ee;
  --t-grapher:#22d3ee; --t-calendar:#fb923c; --t-analytics:#34d399;
}
*{box-sizing:border-box;margin:0;padding:0}

/* ─── Ambient blobs (dark only) ──────────────────────────────────────────── */
html[data-theme="dark"] body::before,
html[data-theme="dark"] body::after{
  content:'';position:fixed;border-radius:50%;pointer-events:none;z-index:0;filter:blur(72px);
}
html[data-theme="dark"] body::before{
  width:520px;height:520px;top:-120px;right:-80px;
  background:radial-gradient(circle,var(--blob1),transparent 70%);
  animation:blobFloat1 18s ease-in-out infinite;
}
html[data-theme="dark"] body::after{
  width:400px;height:400px;bottom:-100px;left:60px;
  background:radial-gradient(circle,var(--blob2),transparent 70%);
  animation:blobFloat2 22s ease-in-out infinite;
}
@keyframes blobFloat1{0%,100%{transform:translate(0,0) scale(1);}33%{transform:translate(-40px,30px) scale(1.08);}66%{transform:translate(30px,-20px) scale(.95);}}
@keyframes blobFloat2{0%,100%{transform:translate(0,0) scale(1);}40%{transform:translate(30px,-40px) scale(1.05);}70%{transform:translate(-20px,20px) scale(.97);}}

/* Grid sutil cian (firma visual Apex base44) — solo dark */
html[data-theme="dark"] body{
  background-image:
    linear-gradient(rgba(0,242,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,242,255,.035) 1px, transparent 1px);
  background-size:54px 54px;
  background-position:center top;
}
body{font-family:"Inter",-apple-system,system-ui,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);height:100vh;overflow:hidden;display:flex;flex-direction:column;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:15px;line-height:1.6;letter-spacing:0;position:relative;}
/* Jerarquía tipográfica — Syne para display, Inter para cuerpo */
h1,h2,h3,
#hero-greeting,
.tools-hub-title,
.hc-title,
.live-start-card h2,
.lr-title,
#lr-title,
.class-card-name,
#profile-modal-title,
.logo-text,
#cal-month-label,
.an-kpi-num {
  font-family:"Montserrat","Inter",system-ui,sans-serif;
  letter-spacing:-.025em;
}
/* Tool titles mantienen Inter pero con Syne para el nombre */
.tool-title,.prog-title{
  letter-spacing:-.02em;
}
/* Hero greeting — firma tipográfica principal */
/* Saludo: secundario (Fase 7) */
#hero-greeting{
  font-family:"Inter",system-ui,sans-serif;
  font-size:15px;font-weight:600;color:var(--muted);
  letter-spacing:0;line-height:1.3;margin-bottom:6px;
}
/* Pregunta protagonista (Fase 7) */
#hero-lead{
  font-family:"Montserrat",system-ui,sans-serif;
  font-size:25px;font-weight:700;color:var(--text);
  letter-spacing:-.015em;line-height:1.2;margin-bottom:18px;max-width:560px;
}
.tab-icon svg,.hc-icon svg{stroke-width:1.9;}
button{cursor:pointer;border:none;font-family:inherit;}
input,textarea,select{font-family:inherit;}
::-webkit-scrollbar{width:5px;}
::-webkit-scrollbar-track{background:transparent;}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px;}
html[data-theme="dark"] ::-webkit-scrollbar-thumb{background:rgba(255,255,255,0.1);border-radius:3px;}
html[data-theme="dark"] ::-webkit-scrollbar-thumb:hover{background:rgba(124,99,255,0.4);}

/* ─── Top nav ────────────────────────────────────────────────────────────── */
#topnav {
  display:flex;align-items:center;gap:4px;
  padding:0 16px;height:52px;
  background:var(--panel);border-bottom:1px solid var(--border);
  flex-shrink:0;position:relative;z-index:100;
}
html[data-theme="dark"] #topnav{
  background:var(--glass);
  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);
  border-bottom:1px solid var(--glass-border);
}
#logo {
  display:flex;align-items:center;gap:9px;margin-right:20px;
  font-size:16px;font-weight:800;letter-spacing:-.04em;
}
.logo-img{height:26px;width:auto;display:block;}
/* Logo PNG ya es blanco con fondo transparente → blend directo, sin filtros */
.auth-brand img{height:34px;width:auto;display:block;margin:0 auto;}
.logo-text{
  font-family:"Montserrat",system-ui,sans-serif;
  font-weight:800;letter-spacing:-.04em;
}
html[data-theme="dark"] .logo-text{
  background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
  filter:drop-shadow(0 0 8px rgba(124,99,255,.4));
}
#logo .ai-mark{width:30px;height:30px;}
/* Marca de IA (icono con destello) */
.ai-mark{display:block;border-radius:24%;filter:drop-shadow(0 2px 7px rgba(110,74,224,.38));}
html[data-theme="dark"] .ai-mark{
  filter:drop-shadow(0 0 8px rgba(124,99,255,.55)) drop-shadow(0 2px 4px rgba(0,0,0,.5));
}
.ai-mark .spark{transform-origin:16px 16px;animation:aiPulse 3.2s ease-in-out infinite;}
@keyframes aiPulse{0%,100%{transform:scale(1);opacity:1;}50%{transform:scale(.86);opacity:.82;}}
/* Avatar/nombre del bot en el chat */
.bot-name{display:flex;align-items:center;gap:6px;font-size:11px;font-weight:700;color:var(--muted);margin-bottom:7px;}
.bot-name .ai-mark{width:18px;height:18px;}
/* Sugerencias en el chat vacío */
.chat-suggestions{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:18px;max-width:460px;}
.chat-sugg{padding:8px 13px;border-radius:20px;font-size:12.5px;font-weight:500;background:var(--panel);
  border:1px solid var(--border);color:var(--text);box-shadow:var(--shadow);transition:all .15s;}
.chat-sugg:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-1px);}
.nav-tab {
  display:flex;align-items:center;gap:6px;padding:6px 12px;
  border-radius:8px;font-size:13px;font-weight:500;
  background:none;color:var(--muted);transition:all .15s;
}
.nav-tab:hover{background:var(--surface);color:var(--text);}
.nav-tab.active{background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--accent);font-weight:600;}
.nav-tab .tab-icon{font-size:14px;}
#nav-subject{
  background:var(--surface);color:var(--text);
  border:1px solid var(--border);border-radius:8px;padding:5px 10px;font-size:12px;margin-left:10px;
}
/* Selector de idioma del tutor */
#lang-switch{display:inline-flex;background:var(--surface2);border:1px solid var(--border);border-radius:9px;padding:2px;gap:2px;}
.lang-btn{padding:5px 11px;border-radius:7px;font-size:12px;font-weight:700;color:var(--muted);background:none;letter-spacing:.02em;transition:all .15s;}
.lang-btn.active{background:var(--panel);color:var(--accent);box-shadow:var(--shadow);}
#theme-btn{background:var(--surface);border:1px solid var(--border);border-radius:9px;
  width:34px;height:34px;font-size:15px;color:var(--text);}
#theme-btn:hover{border-color:var(--accent);}

/* ─── Layout ─────────────────────────────────────────────────────────────── */
#layout{display:flex;flex:1;overflow:hidden;}

/* ─── Sidebar (contenedor flotante) ──────────────────────────────────────── */
#sidebar {
  width:var(--sidebar);flex-shrink:0;
  background:var(--panel);border:1px solid var(--border);border-radius:16px;
  margin:12px 0 12px 12px;
  display:flex;flex-direction:column;overflow:hidden;transition:width .25s cubic-bezier(.4,0,.2,1);
  position:relative;z-index:50;box-shadow:var(--shadow);
}
html[data-theme="dark"] #sidebar{
  background:rgba(6,5,18,0.82);
  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);
  border-right:1px solid var(--glass-border);
}
#sidebar.collapsed{width:0;}
#sidebar-inner{flex:1;overflow-y:auto;padding:12px;}
/* Navegación principal en la barra lateral */
#sidebar-nav{display:flex;flex-direction:column;gap:3px;margin-bottom:14px;padding-bottom:12px;border-bottom:1px solid var(--border);}
.nav-cat{
  font-size:10px;text-transform:uppercase;letter-spacing:.1em;
  color:var(--muted);font-weight:600;margin:16px 0 6px;padding:0 8px;opacity:.55;
  font-family:"Inter",system-ui,sans-serif;
}
.nav-cat:first-child{margin-top:4px;}
#sidebar-nav .nav-tab,.nav-group-head{
  width:100%;display:flex;align-items:center;gap:13px;padding:10px 13px;border-radius:12px;
  font-size:14px;font-weight:500;background:none;color:#475569;text-align:left;
  transition:background .16s ease, color .16s ease;
}
#sidebar-nav .nav-tab .tab-icon,.nav-group-head .tab-icon{width:22px;flex-shrink:0;color:#64748b;display:inline-flex;align-items:center;justify-content:center;transition:color .16s ease;}
#sidebar-nav .nav-tab .tab-icon svg,.nav-group-head .tab-icon svg{width:20px;height:20px;stroke-width:1.7;}
#sidebar-nav .nav-tab:hover,.nav-group-head:hover{background:var(--surface);color:var(--text);}
#sidebar-nav .nav-tab:hover .tab-icon,.nav-group-head:hover .tab-icon{color:var(--text);}
#sidebar-nav .nav-tab.active{
  background:color-mix(in srgb,var(--accent) 11%,transparent);
  color:var(--accent);font-weight:600;
}
#sidebar-nav .nav-tab.active .tab-icon{color:var(--accent);}
.nav-group{margin-top:2px;}
.nav-chev{font-size:11px;color:var(--muted);transition:transform .2s cubic-bezier(.4,0,.2,1);}
.nav-group.collapsed .nav-chev{transform:rotate(-90deg);}
.nav-group-items{display:flex;flex-direction:column;gap:3px;margin-left:17px;padding-left:8px;border-left:1px solid var(--border);}
.nav-group.collapsed .nav-group-items{display:none;}
.nav-group-items .nav-tab{font-size:13.5px;padding:9px 12px;}
.nav-group-items .nav-tab .tab-icon svg{width:18px;height:18px;}
#sidebar-foot{flex-shrink:0;border-top:1px solid var(--border);padding:10px 12px;}
html[data-theme="dark"] #sidebar-foot{border-top-color:var(--glass-border);}
/* Card Apex Pro */
#apex-pro{
  width:100%;display:flex;align-items:center;gap:11px;text-align:left;margin-bottom:10px;
  padding:12px 13px;border-radius:14px;
  background:linear-gradient(135deg, color-mix(in srgb,var(--accent) 18%,var(--panel)), color-mix(in srgb,var(--accent2) 16%,var(--panel)));
  border:1px solid color-mix(in srgb,var(--accent) 30%,var(--border));transition:all .18s;
}
#apex-pro:hover{box-shadow:0 6px 18px rgba(34,211,238,.22);transform:translateY(-1px);}
.apex-pro-ic{width:38px;height:38px;border-radius:11px;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:#fff;border:1px solid var(--border);box-shadow:0 4px 10px rgba(37,99,235,.18);padding:6px;}
.apex-pro-ic svg{width:20px;height:20px;stroke:#fff;}
.apex-pro-ic img{width:100%;height:100%;object-fit:contain;display:block;}
.apex-pro-txt{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px;}
.apex-pro-title{font-family:"Montserrat",system-ui,sans-serif;font-size:13.5px;font-weight:700;color:var(--text);}
.apex-pro-sub{font-size:11px;color:var(--muted);line-height:1.35;}
.apex-pro-arrow{color:var(--muted);flex-shrink:0;display:flex;}
.apex-pro-arrow svg{width:15px;height:15px;}
.sidebar-section{margin-bottom:18px;}
.sidebar-label{font-size:10px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:8px;}
.new-chat-btn{
  width:100%;padding:9px;border-radius:11px;font-size:13px;font-weight:600;
  background:var(--grad);color:#fff;margin-bottom:8px;
  box-shadow:0 2px 12px rgba(91,108,240,.25);
  transition:opacity .15s, box-shadow .2s, transform .15s;
  position:relative;overflow:hidden;
}
html[data-theme="dark"] .new-chat-btn{
  box-shadow:0 0 0 1px rgba(124,99,255,.3), 0 4px 20px rgba(109,86,245,.35);
}
.new-chat-btn::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(135deg,rgba(255,255,255,.12) 0%,transparent 60%);
  pointer-events:none;
}
.new-chat-btn:hover{opacity:.92;transform:translateY(-1px);}
html[data-theme="dark"] .new-chat-btn:hover{
  box-shadow:0 0 0 1px rgba(124,99,255,.45), 0 6px 28px rgba(109,86,245,.5);
}
#sidebar-classes-btn{
  width:100%;text-align:left;padding:9px 12px;border-radius:10px;font-size:13px;font-weight:500;
  background:var(--surface);color:var(--text);border:1px solid var(--border);transition:all .15s;
}
#sidebar-classes-btn:hover{border-color:var(--accent);color:var(--accent);}

/* Sesiones */
.session-item{
  display:flex;align-items:center;gap:6px;padding:7px 9px;
  border-radius:9px;cursor:pointer;border:1px solid transparent;margin-bottom:2px;
  transition:all .15s;
}
.session-item:hover{background:var(--surface);}
.session-item.active{background:var(--surface2);border-color:var(--accent);}
.session-name{flex:1;font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;outline:none;}
.session-name[contenteditable="true"]{background:var(--bg);border-radius:4px;padding:1px 4px;border:1px solid var(--accent);}
.session-meta{font-size:10px;color:var(--muted);flex-shrink:0;}
.session-del{background:none;color:transparent;font-size:12px;padding:2px 4px;border-radius:4px;flex-shrink:0;}
.session-item:hover .session-del{color:var(--muted);}
.session-del:hover{color:var(--danger)!important;background:var(--tint-bad);}

/* Material */
.material-item{font-size:12px;padding:2px 0;color:var(--muted);}
.material-subject{font-size:12px;font-weight:600;color:var(--text);padding:3px 0;}

/* Upload */
.upload-box{background:var(--surface);border:1px dashed var(--border);border-radius:10px;padding:12px;}
.upload-hint{color:var(--muted);font-size:11px;margin-bottom:8px;line-height:1.5;}
.upload-box input{
  width:100%;margin:3px 0;background:var(--bg);color:var(--text);
  border:1px solid var(--border);border-radius:7px;padding:6px;font-size:11px;
}
.upload-btn{width:100%;margin-top:8px;padding:7px;border-radius:8px;font-size:12px;font-weight:600;background:var(--accent);color:#fff;}
.upload-btn:hover{opacity:.9;}

/* ─── Main content ───────────────────────────────────────────────────────── */
#main{flex:1;display:flex;flex-direction:column;overflow:hidden;position:relative;z-index:1;}

/* ─── Cards — premium glass effect (dark only) ──────────────────────────── */
html[data-theme="dark"] .prog-card,
html[data-theme="dark"] #home-tasks,
html[data-theme="dark"] .review-card,
html[data-theme="dark"] .hc-card,
html[data-theme="dark"] .lr-card,
html[data-theme="dark"] .class-card,
html[data-theme="dark"] .an-card,
html[data-theme="dark"] .an-card-wide {
  background:rgba(12,10,28,0.75);
  backdrop-filter:blur(12px) saturate(140%);
  -webkit-backdrop-filter:blur(12px) saturate(140%);
  border:1px solid rgba(255,255,255,0.08);
}
html[data-theme="dark"] .review-card.due{
  border-color:rgba(45,212,191,0.35);
  box-shadow:0 0 0 2px rgba(45,212,191,0.12), var(--shadow);
}

/* Hero card glass */
html[data-theme="dark"] #home-hero{
  background:
    radial-gradient(circle at 88% 12%, rgba(109,86,245,.12), transparent 42%),
    radial-gradient(circle at 5% 95%, rgba(124,99,255,.09), transparent 45%),
    rgba(10,8,26,0.8);
  backdrop-filter:blur(14px) saturate(150%);
  -webkit-backdrop-filter:blur(14px) saturate(150%);
  border:1px solid rgba(255,255,255,0.09);
  box-shadow:0 0 0 1px rgba(124,99,255,.1), var(--shadow-lg);
}

/* Hover lift on cards */
.prog-card,.review-card,.hc-card{
  transition:transform .2s cubic-bezier(.4,0,.2,1), box-shadow .2s ease;
}
.prog-card:hover,.hc-card:hover{
  transform:translateY(-2px);
  box-shadow:var(--shadow-lg);
}
html[data-theme="dark"] .prog-card:hover,
html[data-theme="dark"] .hc-card:hover{
  box-shadow:0 0 0 1px rgba(124,99,255,.2), 0 12px 40px rgba(0,0,0,.6);
}

/* Tool views */
.tool-view{display:none;flex:1;flex-direction:column;overflow:hidden;position:relative;}
.tool-view.active{display:flex;}

/* ─── INICIO / HOME ──────────────────────────────────────────────────────── */
#home-scroll{flex:1;overflow-y:auto;padding:32px 40px 48px;max-width:1100px;width:100%;margin:0 auto;}
/* Header superior */
#home-topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:22px;flex-wrap:wrap;}
#hero-greeting{font-family:"Montserrat",system-ui,sans-serif;font-size:24px;font-weight:700;color:var(--text);letter-spacing:-.02em;line-height:1.2;}
#hero-date{font-size:13.5px;color:var(--muted);margin-top:3px;}
#hero-clock{
  font-family:ui-monospace,"SF Mono","Menlo","Roboto Mono",monospace;
  font-size:22px;font-weight:500;letter-spacing:.04em;color:var(--muted);
  font-variant-numeric:tabular-nums;font-feature-settings:"tnum";white-space:nowrap;padding-top:4px;
}
/* Hero: foco de hoy (glassmorphism controlado) */
#home-hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(circle at 88% 18%, rgba(37,99,235,.05), transparent 46%),
    rgba(255,255,255,.72);
  backdrop-filter:blur(14px) saturate(140%);-webkit-backdrop-filter:blur(14px) saturate(140%);
  border:1px solid var(--border);border-radius:20px;
  padding:34px 36px;margin-bottom:28px;
  box-shadow:0 1px 3px rgba(0,0,0,.04), 0 12px 30px rgba(37,99,235,.06);
}
.hero-eyebrow{font-size:11px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:14px;}
/* Barra de búsqueda del hero */
.hero-search{
  display:flex;align-items:center;gap:11px;width:100%;max-width:560px;
  background:var(--surface);border:1px solid var(--border);border-radius:13px;
  padding:13px 14px;cursor:text;text-align:left;
  box-shadow:0 1px 2px rgba(0,0,0,.04);transition:border-color .15s, box-shadow .15s;
}
.hero-search:hover{border-color:color-mix(in srgb,var(--accent) 45%,var(--border));box-shadow:0 2px 10px rgba(37,99,235,.08);}
.hero-search .hs-ic{display:inline-flex;color:var(--muted);}
.hero-search .hs-ic svg{width:19px;height:19px;}
.hero-search .hs-ph{flex:1;color:var(--muted);font-size:14.5px;}
.hero-search .hs-kbd{
  font-family:ui-monospace,monospace;font-size:11px;color:var(--muted);
  background:var(--surface);border:1px solid var(--border);border-radius:6px;padding:3px 7px;
}
/* Repaso (repetición espaciada) */
#home-review{margin-bottom:34px;}
.review-card{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:18px;box-shadow:var(--shadow);}
.review-card.due{border-color:var(--t-practice);box-shadow:0 0 0 3px color-mix(in srgb,var(--t-practice) 12%,transparent);}
.review-head{display:flex;align-items:center;gap:10px;margin-bottom:12px;}
.review-title{font-size:14px;font-weight:700;}
.review-count{margin-left:auto;font-size:12px;font-weight:700;color:var(--t-practice);background:color-mix(in srgb,var(--t-practice) 14%,transparent);padding:3px 10px;border-radius:20px;}
.review-all{display:inline-flex;align-items:center;gap:6px;margin-bottom:12px;padding:9px 16px;border-radius:10px;font-size:13px;font-weight:700;cursor:pointer;background:var(--t-practice);color:#fff;border:none;box-shadow:var(--shadow);transition:transform .12s ease,filter .12s ease;}
.review-all:hover{transform:translateY(-1px);filter:brightness(1.07);}
.srs-badge{display:inline-flex;align-items:center;justify-content:center;min-width:17px;height:17px;padding:0 4px;margin-left:6px;border-radius:9px;background:#ef4444;color:#fff;font-size:10.5px;font-weight:800;line-height:1;vertical-align:middle;}
#bottom-nav .bn-item{position:relative;}
#bottom-nav .srs-badge{position:absolute;top:3px;left:calc(50% + 6px);margin:0;}
.review-chips{display:flex;flex-wrap:wrap;gap:8px;}
.review-chip{display:flex;align-items:center;gap:8px;padding:8px 12px;border-radius:10px;border:1px solid var(--border);background:var(--surface);font-size:13px;}
.review-chip b{text-transform:capitalize;}
.review-chip button{padding:5px 12px;border-radius:8px;font-size:12px;font-weight:600;background:var(--t-practice);color:#fff;}
.review-empty{color:var(--muted);font-size:13px;}
/* Progreso */
#home-progress{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:34px;}
.prog-card{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:18px;box-shadow:var(--shadow);}
.prog-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;}
.prog-title{font-family:"Montserrat",system-ui,sans-serif;font-size:14px;font-weight:700;color:var(--text);letter-spacing:-.01em;}
.prog-edit{font-size:11px;color:var(--accent);font-weight:600;background:none;}
.prog-bar{height:8px;background:var(--surface2);border-radius:6px;overflow:hidden;}
.prog-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:6px;width:0;transition:width .5s cubic-bezier(.4,0,.2,1);}
.prog-sub{font-size:12px;color:var(--muted);margin-top:8px;}
/* Progreso semanal: % grande + mini-stats */
.pw-pct{font-family:"Montserrat",system-ui,sans-serif;font-size:34px;font-weight:800;letter-spacing:-.02em;line-height:1;color:var(--accent);}
.pw-pct small{font-size:18px;font-weight:700;color:var(--accent);margin-left:1px;}
.pw-mini{display:flex;gap:10px;margin-top:16px;padding-top:14px;border-top:1px solid var(--border);}
.pwm{flex:1;text-align:center;}
.pwm-num{font-family:"Montserrat",system-ui,sans-serif;font-size:18px;font-weight:800;color:var(--text);line-height:1;}
.pwm-lbl{font-size:10px;color:var(--muted);margin-top:4px;font-weight:500;line-height:1.2;}
.weak-item{display:flex;align-items:center;gap:10px;padding:6px 0;font-size:13px;}
.weak-name{flex:1;color:var(--text);text-transform:capitalize;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.weak-pct{font-size:12px;font-weight:700;flex-shrink:0;}
.weak-bar{width:70px;height:6px;background:var(--surface2);border-radius:4px;overflow:hidden;flex-shrink:0;}
.weak-bar>div{height:100%;border-radius:4px;}
.prog-empty{font-size:12px;color:var(--muted);line-height:1.5;}
#hero-qs-label{margin-top:18px;font-size:13px;font-weight:700;color:var(--text);}
#home-hero-actions{display:flex;gap:10px;margin-top:10px;flex-wrap:wrap;}
.qs-btn{
  display:inline-flex;align-items:center;gap:8px;padding:11px 16px;border-radius:12px;
  font-size:13px;font-weight:600;background:var(--panel);color:var(--text);
  border:1px solid var(--border);box-shadow:var(--shadow);
  transition:transform .18s cubic-bezier(.4,0,.2,1), box-shadow .18s ease, border-color .18s ease;
}
html[data-theme="dark"] .qs-btn{
  background:rgba(255,255,255,0.04);
  border:1px solid rgba(255,255,255,0.09);
}
.qs-btn span{font-size:16px;}
.qs-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);border-color:var(--accent);}
html[data-theme="dark"] .qs-btn:hover{
  border-color:rgba(124,99,255,.5);
  box-shadow:0 0 0 1px rgba(124,99,255,.2), 0 8px 32px rgba(0,0,0,.55);
  background:rgba(124,99,255,0.07);
}
.hero-btn{
  padding:10px 18px;border-radius:11px;font-size:13px;font-weight:600;
  background:var(--panel);color:var(--text);border:1px solid var(--border);
  box-shadow:var(--shadow);transition:transform .18s cubic-bezier(.4,0,.2,1), box-shadow .18s ease;
}
html[data-theme="dark"] .hero-btn{
  background:rgba(255,255,255,0.04);
  border:1px solid rgba(255,255,255,0.09);
}
.hero-btn:hover{transform:translateY(-1px);box-shadow:var(--shadow-lg);}
.hero-btn.primary{background:var(--grad);color:#fff;border-color:transparent;box-shadow:0 1px 2px rgba(37,99,235,.25);}
.hero-btn.primary:active{transform:translateY(1px);box-shadow:inset 0 2px 5px rgba(0,0,0,.18);}
.new-chat-btn:active,#chat-send:active,#tasks-add-btn:active{transform:translateY(1px);box-shadow:inset 0 2px 5px rgba(0,0,0,.18);}
html[data-theme="dark"] .hero-btn.primary{
  box-shadow:0 0 0 1px rgba(124,99,255,.3), 0 4px 20px rgba(109,86,245,.4);
}
html[data-theme="dark"] .hero-btn.primary:hover{
  box-shadow:0 0 0 1px rgba(124,99,255,.5), 0 6px 28px rgba(109,86,245,.55);
}
#home-hero-art{flex-shrink:0;}
#home-hero-art .ai-mark{width:88px;height:88px;}
.home-section-label{
  font-size:9.5px;font-weight:700;text-transform:uppercase;letter-spacing:.14em;
  color:var(--muted);margin:6px 0 14px;opacity:.7;
  display:flex;align-items:center;gap:10px;
}
.home-section-label::after{
  content:'';flex:1;height:1px;background:var(--border);
}
html[data-theme="dark"] .home-section-label::after{
  background:rgba(255,255,255,0.07);
}
/* Tracker de tareas */
#home-tasks{
  background:var(--panel);border:1px solid var(--border);border-radius:16px;
  padding:18px 20px;margin-bottom:34px;box-shadow:var(--shadow);
}
/* ── Tu semana (agenda de Google) ── */
#home-week{
  background:var(--panel);border:1px solid var(--border);border-radius:16px;
  padding:18px 20px;margin-bottom:20px;box-shadow:var(--shadow);
}
.week-connect{text-align:center;padding:8px 4px;}
.week-connect p{color:var(--muted);font-size:13.5px;margin:0 0 12px;line-height:1.5;}
.week-connect small{display:block;margin-top:9px;color:var(--muted);font-size:11.5px;}
.week-gbtn{
  display:inline-flex;align-items:center;gap:9px;padding:10px 18px;border-radius:10px;
  background:var(--grad);color:#fff;border:none;font-weight:600;font-size:13.5px;cursor:pointer;
  box-shadow:var(--shadow);transition:transform .12s ease,box-shadow .12s ease;
}
.week-gbtn:hover{transform:translateY(-1px);box-shadow:var(--shadow-lg);}
.week-gbtn span{background:#fff;color:#4285F4;border-radius:50%;width:20px;height:20px;display:inline-flex;align-items:center;justify-content:center;font-size:13px;}
.week-loading{color:var(--muted);font-size:13px;padding:8px 2px;}
.week-item{
  display:flex;align-items:center;gap:12px;padding:11px 4px;border-bottom:1px solid var(--border);
}
.week-item:last-child{border-bottom:none;}
.week-ic{font-size:18px;flex-shrink:0;}
.week-info{flex:1;min-width:0;}
.week-t{font-weight:600;font-size:13.5px;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.week-meta{font-size:11.5px;color:var(--muted);margin-top:2px;text-transform:capitalize;}
.week-overdue{color:var(--danger);font-weight:600;text-transform:none;}
.week-suggest{display:flex;align-items:center;gap:12px;flex-wrap:wrap;justify-content:space-between;padding:11px 14px;margin-bottom:10px;border-radius:12px;background:color-mix(in srgb,var(--accent) 9%,transparent);border:1px solid color-mix(in srgb,var(--accent) 22%,transparent);font-size:13px;color:var(--text);}
.week-item.is-overdue .week-ic{opacity:.85;}
.week-study{
  flex-shrink:0;padding:5px 12px;border-radius:8px;font-size:12px;font-weight:600;cursor:pointer;
  background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--accent);
  border:1px solid color-mix(in srgb,var(--accent) 30%,transparent);
}
.week-study:hover{background:color-mix(in srgb,var(--accent) 20%,transparent);}
.week-item{align-items:flex-start;}
.week-actions{display:flex;flex-direction:column;gap:6px;flex-shrink:0;}
.week-learn{
  flex-shrink:0;padding:5px 12px;border-radius:8px;font-size:12px;font-weight:700;cursor:pointer;white-space:nowrap;
  background:var(--t-live,#0ea5e9);color:#fff;border:none;
}
.week-learn:hover{filter:brightness(1.08);}
.week-docs{display:flex;flex-wrap:wrap;gap:6px;margin-top:7px;}
.week-doc{display:inline-flex;align-items:center;gap:5px;max-width:240px;padding:3px 9px;border-radius:8px;font-size:11.5px;
  background:color-mix(in srgb,var(--t-hw,#d97706) 12%,transparent);border:1px solid color-mix(in srgb,var(--t-hw,#d97706) 26%,transparent);
  color:var(--text);text-decoration:none;}
.week-doc-ic{flex-shrink:0;}
.week-doc-n{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.week-doc-open{color:var(--accent);text-decoration:none;font-weight:700;flex-shrink:0;}
/* Modal: elegir cómo estudiar una tarea de Classroom */
.sc-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:10000;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .2s;padding:20px;}
.sc-overlay.open{opacity:1;pointer-events:auto;}
.sc-modal{position:relative;background:var(--panel);border:1px solid var(--border);border-radius:18px;box-shadow:0 12px 40px rgba(0,0,0,.4);max-width:440px;width:100%;padding:26px 24px;}
.sc-close{position:absolute;top:14px;right:14px;width:30px;height:30px;border-radius:8px;background:var(--surface);border:1px solid var(--border);color:var(--muted);font-size:14px;cursor:pointer;}
.sc-close:hover{color:var(--text);}
.sc-title{font-size:18px;font-weight:700;color:var(--text);margin-bottom:4px;}
.sc-sub{font-size:13px;color:var(--muted);margin-bottom:18px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.sc-opts{display:flex;flex-direction:column;gap:12px;}
.sc-opt{display:flex;align-items:center;gap:14px;text-align:left;padding:14px 16px;border-radius:14px;background:var(--surface);border:1px solid var(--border);cursor:pointer;transition:all .15s;}
.sc-opt:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:var(--shadow);}
.sc-opt-ic{flex-shrink:0;width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:22px;}
.sc-opt-body{display:flex;flex-direction:column;gap:3px;}
.sc-opt-t{font-size:15px;font-weight:700;color:var(--text);}
.sc-opt-d{font-size:12.5px;color:var(--muted);line-height:1.4;}
.sc-divider{display:flex;align-items:center;gap:10px;margin:4px 0;color:var(--muted);font-size:11.5px;}
.sc-divider::before,.sc-divider::after{content:"";flex:1;height:1px;background:var(--border);}
.sc-tools{display:flex;gap:8px;}
.sc-tool{flex:1;display:flex;flex-direction:column;align-items:center;gap:5px;padding:11px 6px;border-radius:12px;background:var(--surface);border:1px solid var(--border);cursor:pointer;font-size:12px;font-weight:600;color:var(--text);transition:all .15s;}
.sc-tool:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:var(--shadow);}
.sc-tool-ic{font-size:20px;}
.week-foot{margin-top:12px;font-size:11.5px;color:var(--muted);}
.week-foot a{color:var(--accent);cursor:pointer;text-decoration:underline;}
.tasks-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;}
.tasks-title{font-family:"Montserrat",system-ui,sans-serif;font-size:16px;font-weight:700;color:var(--text);display:flex;align-items:center;gap:9px;}
.tasks-count{font-size:12px;font-weight:700;color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,transparent);border-radius:20px;min-width:22px;height:22px;display:inline-flex;align-items:center;justify-content:center;padding:0 7px;}
.tasks-new{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--accent);background:none;padding:6px 8px;border-radius:9px;}
.tasks-new:hover{background:color-mix(in srgb,var(--accent) 8%,transparent);}
.tasks-foot{display:flex;align-items:center;justify-content:center;gap:7px;font-size:11.5px;color:var(--muted);margin-top:12px;padding-top:12px;border-top:1px solid var(--border);}
#tasks-add-row{display:flex;gap:8px;margin-bottom:12px;}
#tasks-date{background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:10px;padding:9px 11px;font-size:13px;cursor:pointer;flex-shrink:0;}
#tasks-date:focus{outline:none;border-color:var(--accent);}
#tasks-input{
  flex:1;background:var(--surface);color:var(--text);border:1px solid var(--border);
  border-radius:10px;padding:9px 13px;font-size:13px;
}
#tasks-input:focus{outline:none;border-color:var(--accent);}
#tasks-cat{
  background:var(--surface);color:var(--text);border:1px solid var(--border);
  border-radius:10px;padding:9px 11px;font-size:13px;cursor:pointer;flex-shrink:0;
}
#tasks-cat:focus{outline:none;border-color:var(--accent);}
/* Etiquetas de categoría */
.task-tag{
  font-size:10.5px;font-weight:700;padding:3px 9px;border-radius:20px;flex-shrink:0;
  text-transform:uppercase;letter-spacing:.03em;
}
.task-tag.estudio{background:#dbeafe;color:#1d4ed8;}
.task-tag.ejercicios{background:#ede9fe;color:#6d28d9;}
.task-tag.tutoria{background:#fef3c7;color:#b45309;}
.task-tag.general{background:var(--surface2);color:var(--muted);}
.task-tag.completado{background:#dcfce7;color:#15803d;}
#tasks-add-btn{
  padding:9px 16px;border-radius:10px;font-size:13px;font-weight:600;
  background:var(--grad);color:#fff;box-shadow:0 2px 10px rgba(91,108,240,.25);flex-shrink:0;
}
#tasks-add-btn:hover{opacity:.9;}
.task-item{
  display:flex;align-items:center;gap:11px;padding:11px 8px;
  border-bottom:1px solid var(--border);border-radius:10px;transition:background .15s;
}
.task-item:last-child{border-bottom:none;}
.task-item:hover{background:var(--surface);}
.task-item.dragging{opacity:.5;}
.task-grip{display:flex;color:var(--muted);cursor:grab;opacity:.5;flex-shrink:0;}
.task-grip svg{width:16px;height:16px;}
.task-item:hover .task-grip{opacity:.9;}
.task-check{
  width:22px;height:22px;flex-shrink:0;border-radius:50%;border:2px solid color-mix(in srgb,var(--accent) 45%,var(--border));
  background:var(--panel);color:transparent;font-size:12px;font-weight:800;line-height:1;
  display:flex;align-items:center;justify-content:center;transition:all .15s;cursor:pointer;
}
.task-check:hover{border-color:var(--accent);}
.task-check.done{background:var(--success);border-color:var(--success);color:#fff;}
.task-text{flex:1;font-size:14px;color:var(--text);line-height:1.4;word-break:break-word;}
.task-item.done .task-text{text-decoration:line-through;color:var(--muted);}
.task-date{display:inline-flex;align-items:center;gap:4px;font-size:11.5px;font-weight:600;color:var(--muted);flex-shrink:0;}
.task-date svg{width:13px;height:13px;}
.task-date.over{color:var(--danger);}
.task-menu{display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:8px;background:none;color:var(--muted);flex-shrink:0;opacity:0;transition:all .15s;}
.task-menu svg{width:16px;height:16px;}
.task-item:hover .task-menu{opacity:1;}
.task-menu:hover{background:var(--surface2);color:var(--danger);}
.tasks-empty{color:var(--muted);font-size:13px;text-align:center;padding:16px;}
#home-tools{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));
  gap:16px;margin-bottom:34px;
}
/* Hub de Herramientas */
#tools-scroll{flex:1;overflow-y:auto;padding:32px 40px 48px;max-width:1100px;width:100%;margin:0 auto;}
.tools-hub-title{font-family:"Montserrat",system-ui,sans-serif;font-size:26px;font-weight:800;letter-spacing:-.05em;margin-bottom:6px;}
.tools-hub-sub{font-size:14px;color:var(--muted);margin-bottom:26px;line-height:1.6;}
#tools-hub-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;}
/* Boton volver dentro de las herramientas */
.tool-back{
  width:30px;height:30px;border-radius:8px;font-size:15px;font-weight:700;flex-shrink:0;
  background:var(--surface2);color:var(--text);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;transition:all .15s;margin-right:4px;
}
.tool-back:hover{border-color:var(--c,var(--accent));color:var(--c,var(--accent));}
/* Segmented control (toggle Aprender / Prueba) */
.seg{display:inline-flex;background:var(--surface2);border:1px solid var(--border);border-radius:9px;padding:2px;gap:2px;}
.seg-btn{padding:5px 12px;border-radius:7px;font-size:12px;font-weight:600;background:none;color:var(--muted);transition:all .15s;}
.seg-btn.active{background:var(--panel);color:var(--c,var(--accent));box-shadow:var(--shadow);}
.home-card{
  text-align:left;background:var(--panel);border:1px solid var(--border);
  border-radius:16px;padding:18px;cursor:pointer;
  box-shadow:var(--shadow);
  transition:transform .22s cubic-bezier(.4,0,.2,1), box-shadow .22s ease, border-color .2s ease;
  position:relative;overflow:hidden;
}
.home-card::before{
  content:"";position:absolute;top:0;left:0;width:100%;height:3px;background:var(--c);
}
/* Shine overlay */
.home-card::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(135deg,rgba(255,255,255,.06) 0%,transparent 55%);
  pointer-events:none;opacity:0;transition:opacity .2s;
}
.home-card:hover::after{opacity:1;}
.home-card:hover{
  transform:translateY(-3px);
  box-shadow:0 12px 32px color-mix(in srgb,var(--c) 22%,transparent);
  border-color:var(--c);
}
html[data-theme="dark"] .home-card{
  background:rgba(12,10,28,0.72);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,0.08);
}
html[data-theme="dark"] .home-card:hover{
  box-shadow:0 0 0 1px color-mix(in srgb,var(--c) 40%,transparent),
             0 12px 36px rgba(0,0,0,.6);
  border-color:color-mix(in srgb,var(--c) 50%,transparent);
}
.hc-icon{
  width:44px;height:44px;border-radius:12px;display:flex;align-items:center;
  justify-content:center;font-size:22px;margin-bottom:14px;color:var(--c);
  background:color-mix(in srgb, var(--c) 13%, transparent);
}
html[data-theme="dark"] .hc-icon{
  background:color-mix(in srgb, var(--c) 18%, transparent);
  box-shadow:0 0 0 1px color-mix(in srgb,var(--c) 20%,transparent);
}
.hc-icon svg{width:23px;height:23px;}
.tab-icon{display:inline-flex;align-items:center;justify-content:center;}
.tab-icon svg{width:18px;height:18px;display:block;}
.hc-title{font-family:"Montserrat",system-ui,sans-serif;font-size:15px;font-weight:700;letter-spacing:-.02em;margin-bottom:4px;}
.hc-desc{font-size:12px;color:var(--muted);line-height:1.55;}

/* ─── Tool cards (outline, estilo template pro) ──────────────────────────── */
#home-quicktools{
  display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:36px;
}
.qt-card{
  position:relative;text-align:left;cursor:pointer;
  border:1px solid var(--border);border-radius:16px;padding:20px;
  background:var(--panel);box-shadow:var(--shadow);
  transition:transform .18s cubic-bezier(.4,0,.2,1), box-shadow .18s ease, border-color .18s ease;
}
.qt-card:hover{
  transform:translateY(-3px);box-shadow:var(--shadow-lg);
  border-color:color-mix(in srgb,var(--accent) 35%,var(--border));
}
.qt-ic{
  display:flex;align-items:center;justify-content:center;
  width:50px;height:50px;border-radius:14px;margin-bottom:14px;color:#fff;
  background:var(--g, var(--grad));box-shadow:0 5px 14px rgba(60,40,140,.18);
  transition:transform .18s;
}
.qt-ic svg{width:25px;height:25px;stroke:#fff;stroke-width:1.7;}
.qt-card:hover .qt-ic{transform:scale(1.05);}
.qt-title{font-family:"Montserrat",system-ui,sans-serif;font-size:16px;font-weight:700;color:var(--text);letter-spacing:-.01em;line-height:1.2;margin-bottom:5px;}
.qt-sub{font-size:13px;font-weight:400;color:var(--muted);line-height:1.5;max-width:90%;}
.qt-arrow{
  position:absolute;right:18px;bottom:18px;display:flex;color:var(--muted);
  opacity:.55;transition:opacity .18s, transform .18s, color .18s;
}
.qt-arrow svg{width:18px;height:18px;stroke-width:1.8;}
.qt-card:hover .qt-arrow{opacity:1;color:var(--accent);transform:translate(2px,-2px);}

/* ─── Stat cards (estilo template: icono+label arriba, número grande, sub) ── */
#home-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:36px;}
.stat-card{
  display:flex;flex-direction:column;
  background:var(--panel);border:1px solid var(--border);border-radius:16px;
  padding:18px 20px;box-shadow:var(--shadow);
  transition:transform .2s cubic-bezier(.4,0,.2,1), box-shadow .2s ease;
}
.stat-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}
.stat-top{display:flex;align-items:center;gap:12px;margin-bottom:14px;}
.stat-ic{
  width:46px;height:46px;border-radius:13px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;font-size:20px;color:var(--sc);
  background:color-mix(in srgb,var(--sc) 12%,transparent);
}
.stat-ic svg{width:23px;height:23px;stroke:var(--sc);}
.stat-lbl{font-size:11px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;line-height:1.3;}
.stat-num{font-family:"Montserrat",system-ui,sans-serif;font-size:30px;font-weight:800;letter-spacing:-.02em;line-height:1;color:var(--text);}
.stat-num small{font-size:14px;font-weight:600;color:var(--muted);}
.stat-sub{font-size:12.5px;font-weight:600;color:var(--accent);margin-top:8px;}
.stat-sub.amber{color:#b8821f;}
.stat-sub.green{color:var(--success);}

/* ─── Columnas home (contenido + panel lateral) — estilo SkillSet ────────── */
.home-cols{display:grid;grid-template-columns:1fr;gap:28px;align-items:start;}
.home-col-side{position:sticky;top:8px;display:flex;flex-direction:column;gap:18px;}
.home-col-side #home-progress{grid-template-columns:1fr;margin-bottom:0;gap:14px;}
/* Side cards (Próximas sesiones, Logros) */
.side-card{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:18px;box-shadow:var(--shadow);}
.side-card-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px;}
.side-card-title{font-family:"Montserrat",system-ui,sans-serif;font-size:14px;font-weight:700;color:var(--text);letter-spacing:-.01em;}
.side-link{font-size:12px;font-weight:600;color:var(--accent);cursor:pointer;}
.side-link:hover{text-decoration:underline;}
.up-row{display:flex;align-items:center;gap:12px;padding:9px 0;border-bottom:1px solid var(--border);cursor:pointer;transition:opacity .15s;}
.up-row:last-child{border-bottom:none;}
.up-row:hover{opacity:.7;}
.up-ic{width:38px;height:38px;border-radius:11px;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:17px;
  background:color-mix(in srgb,var(--accent) 12%,transparent);}
.up-body{flex:1;min-width:0;}
.up-name{font-size:13.5px;font-weight:600;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.up-when{font-size:11.5px;color:var(--muted);margin-top:1px;}
.up-empty{font-size:12.5px;color:var(--muted);line-height:1.5;}
.ach-row{display:flex;align-items:center;gap:12px;padding:11px 0;border-bottom:1px solid var(--border);}
.ach-row:last-child{border-bottom:none;}
.ach-badge{width:42px;height:42px;border-radius:12px;flex-shrink:0;display:flex;align-items:center;justify-content:center;color:var(--abc,#16a34a);background:color-mix(in srgb,var(--abc,#16a34a) 12%,transparent);}
.ach-badge svg{width:21px;height:21px;stroke:var(--abc,#16a34a);}
.ach-main{flex:1;min-width:0;}
.ach-name{font-size:13.5px;font-weight:700;color:var(--text);}
.ach-desc{font-size:11.5px;color:var(--muted);margin-top:1px;line-height:1.4;}
.ach-meta{display:flex;flex-direction:column;align-items:flex-end;gap:3px;flex-shrink:0;}
.ach-xp{font-size:11.5px;font-weight:700;color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,transparent);border-radius:8px;padding:2px 8px;white-space:nowrap;}
.ach-when{font-size:11px;color:var(--muted);}
.ach-row.locked{opacity:.45;filter:grayscale(.6);}
/* Página de Logros (vista dedicada) */
#ach-page{flex:1;overflow-y:auto;padding:28px 36px 48px;max-width:1100px;width:100%;margin:0 auto;}
/* Nivel + barra de XP (inicio) */
#home-level{display:flex;align-items:center;gap:16px;background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:16px 20px;box-shadow:var(--shadow);margin-bottom:20px;cursor:pointer;transition:transform .12s ease,box-shadow .12s ease;}
#home-level:hover{transform:translateY(-1px);box-shadow:var(--shadow-lg);}
.lv-badge{flex-shrink:0;width:54px;height:54px;border-radius:16px;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;background:linear-gradient(135deg,#7c63ff,#6d4aff);box-shadow:0 4px 14px color-mix(in srgb,#6d4aff 40%,transparent);}
.lv-badge .lv-n{font-family:"Montserrat",system-ui,sans-serif;font-size:22px;font-weight:800;line-height:1;}
.lv-badge .lv-k{font-size:8.5px;font-weight:700;letter-spacing:.08em;opacity:.9;text-transform:uppercase;}
.lv-mid{flex:1;min-width:0;}
.lv-top{display:flex;align-items:baseline;justify-content:space-between;gap:10px;margin-bottom:7px;}
.lv-rank{font-family:"Montserrat",system-ui,sans-serif;font-size:15px;font-weight:700;color:var(--text);}
.lv-xp{font-size:12px;color:var(--muted);font-weight:600;white-space:nowrap;}
.lv-bar{height:10px;border-radius:20px;background:color-mix(in srgb,var(--accent) 12%,var(--surface));overflow:hidden;}
.lv-fill{height:100%;border-radius:20px;background:linear-gradient(90deg,#7c63ff,#22d3ee);transition:width .6s cubic-bezier(.22,1,.36,1);}
.lv-next{font-size:11px;color:var(--muted);margin-top:6px;}
@media(max-width:560px){#home-level{padding:14px;gap:12px;}.lv-badge{width:46px;height:46px;}}
#ach-summary{display:flex;gap:16px;margin-bottom:26px;flex-wrap:wrap;}
.ach-sum-card{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:18px 26px;box-shadow:var(--shadow);min-width:150px;}
.ach-sum-num{font-family:"Montserrat",system-ui,sans-serif;font-size:34px;font-weight:800;color:var(--text);line-height:1;}
.ach-sum-num span{font-size:18px;color:var(--muted);font-weight:700;}
.ach-sum-lbl{font-size:12px;color:var(--muted);margin-top:6px;text-transform:uppercase;letter-spacing:.05em;}
#achievements-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px;}
.ach-card{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:20px 18px;text-align:center;box-shadow:var(--shadow);transition:transform .14s ease,box-shadow .14s ease;}
.ach-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}
.ach-card.locked{opacity:.55;filter:grayscale(.7);}
.ach-card-badge{width:56px;height:56px;border-radius:16px;margin:0 auto 12px;display:flex;align-items:center;justify-content:center;font-size:26px;color:var(--abc,#16a34a);background:color-mix(in srgb,var(--abc,#16a34a) 14%,transparent);}
.ach-card-badge svg{width:28px;height:28px;stroke:var(--abc,#16a34a);}
.ach-card-name{font-size:14.5px;font-weight:700;color:var(--text);}
.ach-card-desc{font-size:12px;color:var(--muted);margin-top:4px;line-height:1.4;min-height:32px;}
.ach-card-xp{font-size:12px;font-weight:700;color:var(--accent);margin-top:10px;}
.ach-card.locked .ach-card-xp{color:var(--muted);}
/* Panel de logros en el inicio */
#home-medals{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:18px 20px;margin-bottom:34px;box-shadow:var(--shadow);}
/* Toast de medalla desbloqueada */
.ach-toast{position:fixed;right:22px;bottom:22px;z-index:9999;display:flex;align-items:center;gap:13px;max-width:330px;
  background:var(--panel);border:1px solid var(--border2,var(--border));border-radius:14px;padding:14px 16px;box-shadow:0 12px 34px rgba(0,0,0,.28);
  transform:translateY(140%);opacity:0;transition:transform .42s cubic-bezier(.2,.9,.3,1.2),opacity .42s ease;}
.ach-toast.show{transform:translateY(0);opacity:1;}
.ach-toast-badge{width:46px;height:46px;border-radius:13px;flex-shrink:0;display:flex;align-items:center;justify-content:center;color:var(--abc,#16a34a);background:color-mix(in srgb,var(--abc,#16a34a) 16%,transparent);}
.ach-toast-badge svg{width:24px;height:24px;stroke:var(--abc,#16a34a);}
.ach-toast-top{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--accent);}
.ach-toast-name{font-size:14.5px;font-weight:800;color:var(--text);margin-top:1px;}
.ach-toast-desc{font-size:11.5px;color:var(--muted);margin-top:2px;line-height:1.4;}
/* Progreso Semanal (right rail) */
.ws-sel{font-size:12px;color:var(--muted);font-weight:600;background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:5px 10px;}
.ws-time{font-family:"Montserrat",system-ui,sans-serif;font-size:14px;color:var(--muted);font-weight:600;margin-top:4px;}
.ws-time b{font-size:30px;font-weight:800;color:var(--text);letter-spacing:-.02em;}
.ws-time span{margin:0 8px 0 3px;}
.ws-row{display:flex;align-items:center;justify-content:space-between;margin:7px 0 18px;}
.ws-lbl{font-size:13px;color:var(--muted);}
.ws-delta{font-size:11.5px;font-weight:700;color:#15803d;background:#dcfce7;border-radius:20px;padding:4px 11px;}
.ws-chart{display:flex;align-items:flex-end;gap:7px;height:130px;}
.ws-bar-col{flex:1;display:flex;flex-direction:column;align-items:center;gap:7px;height:100%;justify-content:flex-end;}
.ws-bar{width:100%;max-width:24px;border-radius:6px 6px 4px 4px;background:linear-gradient(180deg,#86efac,#22c55e);min-height:5px;transition:height .4s cubic-bezier(.4,0,.2,1);}
.ws-bar-col.today .ws-bar{background:linear-gradient(180deg,#34d399,#15803d);}
.ws-bar-lbl{font-size:10.5px;color:var(--muted);font-weight:600;}
.ws-bar-col.today .ws-bar-lbl{color:#15803d;font-weight:700;}
/* Consejo del día */
.tip-card{display:flex;gap:13px;align-items:flex-start;}
.tip-ic{width:44px;height:44px;border-radius:13px;flex-shrink:0;display:flex;align-items:center;justify-content:center;color:#fff;background:var(--grad);box-shadow:0 4px 12px rgba(37,99,235,.28);}
.tip-ic svg{width:22px;height:22px;stroke:#fff;}
.tip-title{font-family:"Montserrat",system-ui,sans-serif;font-size:14px;font-weight:700;color:var(--text);margin-bottom:4px;}
.tip-d{font-size:12.5px;color:var(--muted);line-height:1.5;}

/* Heatmap "Revisión diaria" */
#heatmap-card{margin-top:18px;}
.hm-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:16px;flex-wrap:wrap;}
.hm-sub{font-size:12px;color:var(--muted);margin-top:3px;}
.hm-legend{display:flex;align-items:center;gap:4px;font-size:11px;color:var(--muted);}
.hm-legend .hm-cell{width:12px;height:12px;}
#heatmap{display:flex;gap:4px;overflow-x:auto;padding-bottom:4px;}
.hm-days{display:flex;flex-direction:column;gap:4px;margin-right:6px;}
.hm-days span{height:14px;font-size:9px;color:var(--muted);display:flex;align-items:center;line-height:1;}
.hm-col{display:flex;flex-direction:column;gap:4px;}
.hm-cell{width:14px;height:14px;border-radius:3px;background:#eef2f7;flex-shrink:0;}
.hm-cell.l0{background:#eef2f7;}
.hm-cell.l1{background:#bfdbfe;}
.hm-cell.l2{background:#60a5fa;}
.hm-cell.l3{background:#3b82f6;}
.hm-cell.l4{background:#1d4ed8;}
.hm-cell.fut{background:transparent;}
.home-col-main .home-section-label:first-child,
.home-col-side .home-section-label:first-child{margin-top:0;}
@media(max-width:920px){.home-cols{grid-template-columns:1fr;gap:0;}.home-col-side{position:static;}}
#home-classes{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px;
}
.home-class-card{
  display:flex;align-items:center;gap:12px;background:var(--panel);
  border:1px solid var(--border);border-radius:14px;padding:14px 16px;
  cursor:pointer;box-shadow:var(--shadow);transition:transform .12s, box-shadow .15s;
}
.home-class-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}
.home-class-card .hcc-icon{
  width:40px;height:40px;border-radius:11px;background:var(--grad);
  display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0;
}
.home-class-card .hcc-name{font-size:14px;font-weight:700;}
.home-class-card .hcc-meta{font-size:11px;color:var(--muted);margin-top:2px;}
.home-empty{
  color:var(--muted);font-size:13px;padding:18px;border:1px dashed var(--border);
  border-radius:14px;background:var(--surface);
}
.home-empty a{color:var(--accent);cursor:pointer;font-weight:600;}

/* Tool header (filters) */
.tool-header{
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  padding:13px 20px;border-bottom:1px solid var(--border);
  background:var(--panel);flex-shrink:0;
  position:relative;z-index:10;
}
html[data-theme="dark"] .tool-header{
  background:rgba(6,5,18,0.8);
  backdrop-filter:blur(16px) saturate(150%);
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  border-bottom:1px solid rgba(255,255,255,0.08);
}
.tool-header{--c:var(--accent);}
.tool-title{font-size:15px;font-weight:700;margin-right:4px;color:var(--c);display:inline-flex;align-items:center;gap:8px;}
.tt-icon{display:inline-flex;align-items:center;justify-content:center;color:var(--c);}
.tt-icon svg{width:18px;height:18px;}
/* Botón adjuntar foto en herramientas */
.tool-attach{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:9px;background:var(--surface);border:1px solid var(--border);color:var(--muted);}
.tool-attach:hover{border-color:var(--c,var(--accent));color:var(--c,var(--accent));}
.tool-attach svg{width:18px;height:18px;}
.tool-img-chip{display:inline-flex;align-items:center;gap:6px;background:var(--surface);border:1px solid var(--c,var(--accent));border-radius:9px;padding:3px 4px 3px 6px;font-size:11px;color:var(--muted);}
.tool-img-chip img{width:26px;height:26px;border-radius:5px;object-fit:cover;}
.tool-img-chip button{background:none;color:var(--muted);font-size:12px;padding:2px 5px;border-radius:5px;}
.tool-img-chip button:hover{color:var(--danger);}
/* Estados vacíos: ícono en una placa suave (en vez de emoji gigante) */
.big[data-icon]{width:62px;height:62px;border-radius:18px;margin:0 auto 16px;display:flex;
  align-items:center;justify-content:center;background:var(--surface2);color:var(--muted);}
.big[data-icon] svg{width:28px;height:28px;}
/* Números tabulares (alineados) en relojes/contadores/estadísticas */
#hero-clock,#quiz-timer,#exam-timer,#live-timer,.lr-stat b,.score-num,.weak-pct,
.pr-score .score-num,#hero-streak{font-variant-numeric:tabular-nums;}
.tool-input{
  background:var(--surface);color:var(--text);border:1px solid var(--border);
  border-radius:8px;padding:6px 10px;font-size:12px;
}
.tool-input:focus{outline:none;border-color:var(--c);}
.tool-btn{
  padding:7px 16px;border-radius:8px;font-size:12px;font-weight:600;
  background:var(--c,var(--accent));color:#fff;
  box-shadow:0 2px 10px color-mix(in srgb,var(--c,var(--accent)) 35%,transparent);
}
.tool-btn:hover{opacity:.9;}
.tool-btn:disabled{opacity:.4;cursor:not-allowed;}
.tool-count{width:60px;}
#upStatus{font-size:11px;color:var(--muted);}

/* ─── CHAT ───────────────────────────────────────────────────────────────── */
#chat-header{
  display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 20px;
  background:var(--panel);border-bottom:1px solid var(--border);flex-shrink:0;
}
.ch-left{min-width:0;}
.ch-title{font-family:"Montserrat",system-ui,sans-serif;font-size:16px;font-weight:700;color:var(--text);display:flex;align-items:center;gap:9px;letter-spacing:-.01em;}
.ch-online{display:inline-flex;align-items:center;gap:5px;font-family:"Inter",system-ui,sans-serif;font-size:11.5px;font-weight:600;color:var(--success);}
.ch-dot{width:7px;height:7px;border-radius:50%;background:var(--success);box-shadow:0 0 0 3px color-mix(in srgb,var(--success) 22%,transparent);}
.ch-sub{font-size:13px;color:var(--muted);margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:480px;}
.ch-sub.placeholder{color:var(--muted);}
.ch-history{display:inline-flex;align-items:center;gap:7px;font-size:13px;font-weight:600;color:var(--text);
  background:var(--panel);border:1px solid var(--border);border-radius:11px;padding:8px 14px;box-shadow:var(--shadow);transition:all .15s;flex-shrink:0;}
.ch-history svg{width:16px;height:16px;}
.ch-history:hover{border-color:var(--accent);color:var(--accent);}

/* Modos */
.modes-bar{
  display:flex;gap:5px;padding:8px 18px;flex-wrap:wrap;
  border-bottom:1px solid var(--border);background:var(--bg);flex-shrink:0;
}
.mode-chip{
  padding:4px 11px;border-radius:20px;font-size:11px;font-weight:500;
  background:var(--surface);color:var(--muted);position:relative;transition:all .15s;
}
.mode-chip.active{background:var(--accent);color:#fff;}
.mode-chip:hover .mode-tip{display:block;}
.mode-tip{
  display:none;position:absolute;bottom:calc(100%+8px);left:50%;
  transform:translateX(-50%);background:var(--surface2);color:var(--text);
  font-size:10px;padding:6px 10px;border-radius:8px;white-space:normal;
  border:1px solid var(--border);z-index:20;pointer-events:none;
  max-width:200px;text-align:center;line-height:1.4;
}
.mode-tip::after{
  content:"";position:absolute;top:100%;left:50%;transform:translateX(-50%);
  border:5px solid transparent;border-top-color:var(--surface2);
}

/* Mensajes */
#messages{flex:1;overflow-y:auto;padding:22px 18px;display:flex;flex-direction:column;gap:14px;}
.msg{max-width:760px;line-height:1.65;}
.msg.user{
  align-self:flex-end;background:var(--grad);
  padding:11px 15px;border-radius:16px 16px 4px 16px;font-size:14.5px;color:#062032;font-weight:500;
  border:none;box-shadow:0 4px 14px rgba(34,211,238,.2);
}
/* Bot: avatar afuera + burbuja */
.msg.bot{
  align-self:flex-start;display:flex;gap:11px;align-items:flex-start;
  background:none;border:none;padding:0;font-size:14.5px;max-width:780px;
}
.msg-avatar{width:34px;height:34px;flex-shrink:0;border-radius:10px;display:flex;align-items:center;justify-content:center;
  background:var(--surface);border:1px solid var(--border);}
.msg-avatar .ai-mark{width:21px;height:21px;}
.msg-avatar.mascot{background:none;border:none;width:38px;height:38px;}
.bot-mascot{width:38px;height:38px;object-fit:contain;display:block;}
.bot-name .bot-mascot{width:22px;height:22px;}
.msg-main{min-width:0;flex:1;}
.msg-bubble{
  background:var(--panel);border:1px solid var(--border);border-radius:4px 16px 16px 16px;
  padding:14px 16px;box-shadow:var(--shadow);
}
.msg-actions{display:flex;gap:4px;margin-top:7px;padding-left:2px;}
.msg.typing-indicator .msg-actions{display:none;}
.msg-act{display:flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:8px;
  background:none;color:var(--muted);transition:all .15s;}
.msg-act svg{width:16px;height:16px;}
.msg-act:hover{background:var(--surface);color:var(--accent);}
.msg-act.ok{color:var(--success);}
.msg.bot h1,.msg.bot h2,.msg.bot h3{margin:10px 0 5px;font-size:15px;color:var(--text);}
.msg.bot p{margin:4px 0;}
.msg.bot ul,.msg.bot ol{margin:5px 0;padding-left:20px;}
.msg.bot li{margin:3px 0;}
.msg.bot strong{color:var(--accent);}
/* Diagramas (SVG) dentro de respuestas/explicaciones.
   Fondo blanco fijo: los diagramas usan trazos oscuros, así se ven en cualquier tema.
   :not(.katex *) excluye los SVG internos de KaTeX (raíces, etc.) para no convertirlos en cajas. */
.msg.bot svg:not(.katex *),#summary-output svg:not(.katex *),#essay-feedback svg:not(.katex *),.exam-figure svg:not(.katex *),
#hw-sol svg:not(.katex *),.lr-pane svg:not(.katex *),.pr-explanation svg:not(.katex *),.pr-q svg:not(.katex *),.exam-sol svg:not(.katex *){
  max-width:100%;max-height:360px;height:auto;display:block;margin:10px auto;
  background:#fff;border:1px solid var(--border);border-radius:10px;padding:10px;
}
.msg.bot code{background:var(--surface2);padding:2px 6px;border-radius:5px;font-size:12px;}
.msg.bot pre{background:var(--surface2);padding:12px;border-radius:9px;overflow-x:auto;margin:6px 0;}
.msg.bot blockquote{border-left:3px solid var(--accent);padding-left:10px;color:var(--muted);margin:6px 0;}
.sources{font-size:10px;color:var(--muted);margin-top:8px;border-top:1px solid var(--border);padding-top:6px;}
.empty-state{color:var(--muted);text-align:center;margin:auto;padding:40px 20px;line-height:2;}
.empty-state .big{font-size:32px;margin-bottom:8px;}
.typing-indicator{color:var(--muted);font-style:italic;font-size:13px;}

/* Chat input */
#chat-form{display:flex;flex-direction:column;gap:8px;padding:12px 18px;border-top:1px solid var(--border);background:var(--panel);flex-shrink:0;}
html[data-theme="dark"] #chat-form{
  background:var(--glass);
  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);
  border-top:1px solid var(--glass-border);
}
#img-preview-wrap{display:none;position:relative;width:fit-content;}
#img-preview{max-height:90px;max-width:200px;border-radius:8px;border:1px solid var(--border);}
#img-clear{
  position:absolute;top:-6px;right:-6px;background:var(--danger);
  color:#fff;border:none;border-radius:50%;width:19px;height:19px;
  font-size:11px;cursor:pointer;display:flex;align-items:center;justify-content:center;
}
.chat-row{display:flex;gap:6px;align-items:center;background:var(--panel);border:1px solid var(--border);border-radius:28px;padding:7px 8px 7px 12px;box-shadow:0 2px 14px rgba(37,99,235,.06);transition:border-color .2s, box-shadow .2s;}
.chat-row:focus-within{border-color:color-mix(in srgb,var(--accent) 45%,var(--border));box-shadow:0 4px 20px rgba(37,99,235,.12);}
#chat-img-btn,#chat-audio-btn{
  display:flex;align-items:center;justify-content:center;width:38px;height:38px;flex-shrink:0;
  background:none;color:var(--muted);border:none;border-radius:50%;transition:all .15s;
}
#chat-img-btn svg,#chat-audio-btn svg{width:20px;height:20px;}
#chat-img-btn:hover{background:var(--surface);color:var(--accent);}
#chat-audio-btn:hover{background:var(--surface);color:var(--accent);}
#chat-audio-btn.recording{color:var(--danger);animation:pulse 1s infinite;}
@keyframes pulse{0%,100%{opacity:1;}50%{opacity:.5;}}
#chat-input{
  flex:1;background:none;color:var(--text);border:none;
  padding:9px 6px;font-size:15px;resize:none;line-height:1.4;max-height:120px;
}
#chat-input:focus{outline:none;}
#chat-send{
  display:flex;align-items:center;justify-content:center;width:42px;height:42px;flex-shrink:0;
  border-radius:50%;background:var(--grad);color:#fff;
  box-shadow:0 3px 12px color-mix(in srgb,var(--accent) 38%,transparent);
  transition:box-shadow .2s, transform .15s;
}
#chat-send svg{width:19px;height:19px;}
#chat-send:hover{transform:translateY(-1px);box-shadow:0 5px 18px color-mix(in srgb,var(--accent) 50%,transparent);}
#chat-send:active{transform:translateY(0);}
.msg.user img{max-width:200px;border-radius:8px;display:block;margin-top:6px;}

/* ─── FLASHCARDS ─────────────────────────────────────────────────────────── */
#fc-content{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:30px;gap:20px;}
#fc-progress{font-size:12px;color:var(--muted);}
.flashcard{width:100%;max-width:560px;height:260px;perspective:1200px;cursor:pointer;}
.fc-inner{
  width:100%;height:100%;position:relative;transform-style:preserve-3d;
  transition:transform .55s cubic-bezier(.4,0,.2,1);
}
.flashcard.flipped .fc-inner{transform:rotateY(180deg);}
.fc-face{
  position:absolute;width:100%;height:100%;backface-visibility:hidden;
  border-radius:16px;display:flex;flex-direction:column;align-items:center;
  justify-content:center;padding:28px;text-align:center;
  border:1px solid var(--border);
}
.fc-front{background:var(--surface2);box-shadow:var(--shadow-lg);}
.fc-back{background:var(--surface);transform:rotateY(180deg);box-shadow:var(--shadow-lg);}
.fc-label{font-size:10px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:12px;}
.fc-text{font-size:18px;font-weight:600;line-height:1.5;}
.fc-back .fc-text{font-size:15px;font-weight:400;color:var(--text);}
.fc-hint{font-size:11px;color:var(--muted);margin-top:12px;}
.fc-actions{display:flex;gap:12px;}
.fc-btn{padding:10px 28px;border-radius:10px;font-size:14px;font-weight:600;}
.fc-no{background:var(--tint-bad);color:var(--danger);border:1px solid var(--danger);}
.fc-yes{background:var(--tint-ok);color:var(--success);border:1px solid var(--success);}
.fc-no:hover{background:var(--danger);color:#fff;}
.fc-yes:hover{background:var(--success);color:#fff;}
.fc-score{text-align:center;max-width:400px;}
.fc-score h2{font-size:22px;margin-bottom:8px;}
.fc-score .score-num{font-size:48px;font-weight:800;background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;}
.fc-score p{color:var(--muted);margin:8px 0;}
.fc-retry{margin-top:16px;padding:10px 24px;border-radius:10px;background:var(--grad);color:#fff;font-weight:600;}

/* ─── QUIZ ───────────────────────────────────────────────────────────────── */
#quiz-content{flex:1;overflow-y:auto;padding:28px;display:flex;flex-direction:column;align-items:center;gap:20px;}
#quiz-progress-bar{width:100%;max-width:640px;height:4px;background:var(--border);border-radius:2px;}
#quiz-progress-fill{height:100%;background:var(--grad);border-radius:2px;transition:width .3s;}
#quiz-card{width:100%;max-width:640px;background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:28px;}
.quiz-q{font-size:16px;font-weight:600;margin-bottom:20px;line-height:1.5;}
.quiz-options{display:flex;flex-direction:column;gap:10px;}
.quiz-opt{
  padding:12px 16px;border-radius:10px;font-size:14px;text-align:left;
  background:var(--surface2);border:1px solid var(--border);color:var(--text);
  transition:all .15s;
}
.quiz-opt:hover:not(:disabled){background:var(--surface2);border-color:var(--accent);}
.quiz-opt.correct{background:var(--tint-ok);border-color:var(--success);color:var(--success);}
.quiz-opt.wrong{background:var(--tint-bad);border-color:var(--danger);color:var(--danger);}
.quiz-explanation{
  margin-top:16px;padding:12px;border-radius:9px;
  background:var(--surface2);font-size:13px;color:var(--muted);line-height:1.5;
}
.quiz-next{margin-top:16px;padding:10px 24px;border-radius:10px;background:var(--grad);color:#fff;font-weight:600;}
.quiz-score{text-align:center;max-width:400px;}
.quiz-score .score-num{font-size:52px;font-weight:800;background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;}
#quiz-timer{font-size:12px;color:var(--warning);margin-left:auto;}

/* ─── RESUELVE TU TAREA (PDF) ────────────────────────────────────────────── */
#hw-body{flex:1;overflow-y:auto;padding:32px 40px 48px;}
#hw-landing{max-width:1080px;margin:0 auto;}
.hw-title{font-family:"Montserrat",system-ui,sans-serif;font-size:30px;font-weight:800;letter-spacing:-.02em;color:var(--text);}
.hw-subtitle{font-size:14.5px;color:var(--muted);margin:6px 0 26px;line-height:1.5;}
.hw-cols{display:grid;grid-template-columns:1.15fr 1fr;gap:24px;align-items:start;margin-bottom:26px;}
/* Dropzone */
#hw-drop{min-height:100%;}
.hw-drop-inner{border:2px dashed color-mix(in srgb,var(--accent) 38%,var(--border));border-radius:20px;padding:48px 28px;text-align:center;cursor:pointer;
  background:linear-gradient(180deg, color-mix(in srgb,var(--accent) 7%,var(--panel)), var(--panel));transition:all .18s;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;}
.hw-drop-inner:hover,#hw-drop.dragover .hw-drop-inner{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,var(--panel));}
.hw-pdf{position:relative;width:96px;height:96px;margin-bottom:20px;filter:drop-shadow(0 8px 18px rgba(37,99,235,.18));}
.hw-pdf svg{width:96px;height:96px;color:var(--accent);}
.hw-pdf-tag{position:absolute;left:50%;bottom:14px;transform:translateX(-50%);background:var(--accent);color:#fff;font-size:11px;font-weight:800;letter-spacing:.05em;padding:3px 9px;border-radius:6px;}
.hw-drop-inner h2{font-family:"Montserrat",system-ui,sans-serif;font-size:19px;font-weight:700;letter-spacing:-.01em;margin-bottom:6px;color:var(--text);}
.hw-drop-inner p{font-size:13.5px;color:var(--muted);margin:0 0 16px;line-height:1.5;}
.hw-up-btn{display:inline-flex;align-items:center;gap:8px;background:var(--panel);color:var(--text);font-weight:600;font-size:14px;padding:11px 22px;border-radius:12px;border:1px solid var(--border);box-shadow:var(--shadow);transition:all .15s;}
.hw-up-btn:hover{border-color:var(--accent);color:var(--accent);}
.hw-hint{font-size:12px;color:var(--muted);margin-top:16px;}
/* Tareas recientes */
.hw-recent{background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:18px 20px;box-shadow:var(--shadow);}
.hw-recent-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px;}
.hw-seeall{font-size:12px;font-weight:600;color:var(--accent);background:var(--surface);border:1px solid var(--border);border-radius:9px;padding:6px 12px;}
.hw-seeall:hover{border-color:var(--accent);}
.hw-recent-empty{font-size:13px;color:var(--muted);line-height:1.6;padding:18px 4px;}
.hw-rec{display:flex;align-items:center;gap:13px;padding:13px 4px;border-bottom:1px solid var(--border);cursor:default;}
.hw-rec:last-child{border-bottom:none;}
.hw-rec-ic{width:42px;height:42px;border-radius:11px;flex-shrink:0;display:flex;align-items:center;justify-content:center;color:var(--rc);background:color-mix(in srgb,var(--rc) 12%,transparent);}
.hw-rec-ic svg{width:21px;height:21px;}
.hw-rec-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:3px;}
.hw-rec-name{font-size:13.5px;font-weight:600;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.hw-rec-meta{font-size:11.5px;color:var(--muted);}
.hw-rec-bar{height:4px;background:var(--surface2);border-radius:3px;overflow:hidden;margin-top:2px;}
.hw-rec-bar i{display:block;height:100%;width:100%;background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:3px;}
.hw-rec-count{font-size:11px;color:var(--muted);}
.hw-rec-badge{font-size:10.5px;font-weight:700;color:#15803d;background:#dcfce7;border-radius:20px;padding:4px 10px;flex-shrink:0;}
/* ¿Cómo funciona? */
.hw-how{background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:24px 28px;box-shadow:var(--shadow);}
.hw-how-title{font-family:"Montserrat",system-ui,sans-serif;font-size:16px;font-weight:700;color:var(--text);margin-bottom:20px;}
.hw-steps{display:flex;align-items:flex-start;gap:8px;}
.hw-step{flex:1;display:flex;align-items:flex-start;gap:13px;}
.hw-step-n{width:26px;height:26px;border-radius:50%;flex-shrink:0;background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--accent);font-size:13px;font-weight:800;display:flex;align-items:center;justify-content:center;}
.hw-step-ic{width:48px;height:48px;border-radius:14px;flex-shrink:0;background:color-mix(in srgb,var(--accent) 9%,transparent);color:var(--accent);display:flex;align-items:center;justify-content:center;}
.hw-step-ic svg{width:24px;height:24px;}
.hw-step-t{font-size:14px;font-weight:700;color:var(--text);margin-bottom:3px;}
.hw-step-d{font-size:12.5px;color:var(--muted);line-height:1.5;}
.hw-step-line{flex:0 0 40px;height:1px;border-top:2px dashed var(--border);margin-top:24px;}
@media(max-width:880px){.hw-cols{grid-template-columns:1fr;}.hw-steps{flex-direction:column;gap:18px;}.hw-step-line{display:none;}}
#hw-result{max-width:760px;margin:0 auto;}
#hw-result h1,#hw-result h2{font-size:17px;margin:18px 0 8px;color:var(--t-hw);}
#hw-result h2{font-size:16px;}
#hw-result p{margin:6px 0;line-height:1.7;}
#hw-result ul,#hw-result ol{padding-left:22px;margin:6px 0;}
#hw-result li{margin:4px 0;}
#hw-result strong{color:var(--text);}
#hw-result svg{max-width:100%;height:auto;}
.hw-file-tag{display:inline-flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:8px 14px;font-size:13px;font-weight:600;margin-bottom:18px;}
/* ── Tarea resuelta y explicada ── */
.hw-ex{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:20px 22px;margin-bottom:16px;box-shadow:var(--shadow);}
.hw-ex-head{font-family:"Montserrat",system-ui,sans-serif;font-size:12px;font-weight:800;letter-spacing:.05em;text-transform:uppercase;color:var(--accent);margin-bottom:8px;}
.hw-ex-q{font-size:15px;font-weight:600;color:var(--text);line-height:1.55;margin-bottom:8px;}
.hw-ex-opts{display:flex;flex-direction:column;gap:6px;margin:10px 0;}
.hw-ex-opt{font-size:13.5px;color:var(--muted);padding:7px 12px;border-radius:9px;border:1px solid var(--border);}
.hw-ex-opt.correct{color:var(--success);border-color:color-mix(in srgb,var(--success) 40%,transparent);background:color-mix(in srgb,var(--success) 10%,transparent);font-weight:600;}
.hw-ex-sol{margin-top:12px;padding:14px 16px;border-radius:12px;background:color-mix(in srgb,var(--accent) 7%,transparent);border:1px solid color-mix(in srgb,var(--accent) 18%,transparent);}
.hw-ex-sol-lbl{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--accent);margin-bottom:8px;}
/* ─── TUTOR EN VIVO ──────────────────────────────────────────────────────── */
#live-start{flex:1;overflow-y:auto;display:flex;align-items:center;justify-content:center;padding:40px 24px;
  background:radial-gradient(circle at 50% -5%, rgba(37,99,235,.07), transparent 55%),
             radial-gradient(circle at 92% 108%, rgba(124,99,255,.06), transparent 50%);}
.ls-wrap{max-width:740px;width:100%;text-align:center;}
.ls-status{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:600;color:var(--muted);
  background:var(--panel);border:1px solid var(--border);padding:6px 15px;border-radius:20px;margin-bottom:26px;box-shadow:var(--shadow);}
.ls-dot{width:8px;height:8px;border-radius:50%;background:var(--success);box-shadow:0 0 0 3px color-mix(in srgb,var(--success) 22%,transparent);}
.ls-title{font-family:"Montserrat",system-ui,sans-serif;font-size:40px;font-weight:800;letter-spacing:-.03em;line-height:1.1;color:var(--text);margin-bottom:30px;}
.ls-input-card{display:flex;align-items:center;gap:12px;background:var(--panel);border:1px solid var(--border);border-radius:18px;
  padding:12px 12px 12px 20px;box-shadow:0 4px 22px rgba(37,99,235,.08);margin-bottom:30px;text-align:left;flex-wrap:wrap;}
.ls-input-card:focus-within{border-color:color-mix(in srgb,var(--accent) 45%,var(--border));box-shadow:0 6px 28px rgba(37,99,235,.15);}
.ls-input-card textarea{flex:1;min-width:200px;border:none;background:none;resize:none;font-size:15.5px;color:var(--text);
  min-height:30px;max-height:140px;line-height:1.5;outline:none;font-family:inherit;}
.ls-input-actions{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.ls-upload{display:flex;flex-direction:column;align-items:center;gap:3px;font-size:10px;color:var(--muted);
  background:var(--surface);border:1px solid var(--border);border-radius:13px;padding:9px 13px;font-weight:500;}
.ls-upload svg{width:20px;height:20px;}
.ls-upload:hover{border-color:var(--accent);color:var(--accent);}
.ls-start{display:inline-flex;align-items:center;gap:8px;background:var(--grad);color:#fff;font-size:15px;font-weight:700;
  padding:15px 26px;border-radius:14px;box-shadow:0 4px 16px rgba(37,99,235,.3);transition:transform .15s, box-shadow .2s;}
.ls-start:hover{box-shadow:0 6px 24px rgba(37,99,235,.42);transform:translateY(-1px);}
.ls-start:active{transform:translateY(1px);}
.ls-topics-label{font-size:12.5px;font-weight:600;color:var(--accent);margin-bottom:13px;}
.ls-topics{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:38px;}
.ls-topics button{display:inline-flex;align-items:center;gap:8px;padding:9px 16px;border-radius:24px;font-size:13px;font-weight:500;
  background:var(--panel);border:1px solid var(--border);color:var(--text);box-shadow:var(--shadow);transition:all .15s;}
.ls-topics button .lt-ic{font-style:italic;font-weight:700;color:var(--accent);font-family:Georgia,"Times New Roman",serif;}
.ls-topics button:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px);}
/* Lecciones guardadas */
#saved-lessons{margin-top:30px;border-top:1px solid var(--border);padding-top:24px;text-align:left;}
.sl-head{font-size:14px;font-weight:700;color:var(--text);margin-bottom:14px;}
#saved-lessons-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px;}
.sl-card{position:relative;text-align:left;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:14px 16px;cursor:pointer;transition:all .15s;}
.sl-card:hover{border-color:var(--t-live);box-shadow:var(--shadow);transform:translateY(-2px);}
.sl-card .sl-title{font-size:14px;font-weight:600;color:var(--text);margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.sl-card .sl-meta{font-size:11.5px;color:var(--muted);display:flex;align-items:center;gap:8px;}
.sl-card .sl-badge{background:color-mix(in srgb,var(--success) 14%,transparent);color:var(--success);border-radius:20px;padding:1px 8px;font-weight:700;}
.sl-card .sl-del{position:absolute;top:8px;right:8px;width:24px;height:24px;border-radius:7px;background:var(--surface2);border:1px solid var(--border);color:var(--muted);font-size:12px;opacity:0;transition:opacity .15s;}
.sl-card:hover .sl-del{opacity:1;}
/* Panel lateral de historial del Tutor en Vivo */
.live-history-panel{position:fixed;top:0;right:-420px;width:400px;max-width:90vw;height:100vh;background:var(--panel);border-left:1px solid var(--border);box-shadow:-4px 0 24px rgba(0,0,0,.3);z-index:9999;transition:right .3s ease;display:flex;flex-direction:column;}
.live-history-panel.open{right:0;}
.lhp-header{display:flex;align-items:center;padding:20px;border-bottom:1px solid var(--border);gap:12px;}
.lhp-header h3{flex:1;margin:0;font-size:17px;font-weight:700;color:var(--text);}
.lhp-close{width:32px;height:32px;border-radius:8px;background:var(--surface);border:1px solid var(--border);color:var(--muted);font-size:14px;cursor:pointer;}
.lhp-close:hover{color:var(--text);border-color:var(--text);}
.lhp-list{flex:1;overflow-y:auto;padding:16px;}
.lhp-item{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:14px 16px;margin-bottom:12px;cursor:pointer;transition:all .15s;}
.lhp-item:hover{border-color:var(--t-live);box-shadow:var(--shadow);}
.lhp-item-title{font-size:14px;font-weight:600;color:var(--text);margin-bottom:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.lhp-item-meta{font-size:11.5px;color:var(--muted);display:flex;align-items:center;gap:8px;}
.lhp-item-badge{background:color-mix(in srgb,var(--success) 14%,transparent);color:var(--success);border-radius:20px;padding:1px 8px;font-weight:700;font-size:11px;}
.lhp-item-badge.progress{background:color-mix(in srgb,var(--warning) 14%,transparent);color:var(--warning);}
.lhp-detail{flex:1;overflow-y:auto;padding:16px;}
.lhp-detail-head{display:flex;align-items:center;gap:8px;margin-bottom:16px;}
.lhp-back{width:28px;height:28px;border-radius:7px;background:var(--surface);border:1px solid var(--border);color:var(--muted);font-size:13px;cursor:pointer;}
.lhp-back:hover{color:var(--text);}
.lhp-detail-title{font-size:15px;font-weight:700;color:var(--text);}
.lhp-convo-wrap{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:16px;max-height:60vh;overflow-y:auto;}
.lhp-convo-wrap .msg{margin-bottom:12px;font-size:13.5px;line-height:1.6;}
.lhp-stats{display:flex;gap:12px;margin-bottom:16px;flex-wrap:wrap;}
.lhp-stat{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:8px 12px;font-size:12px;color:var(--muted);}
.lhp-stat b{color:var(--text);}
.lhp-overlay{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:9998;opacity:0;pointer-events:none;transition:opacity .3s;}
.lhp-overlay.open{opacity:1;pointer-events:auto;}
.sl-card .sl-del:hover{color:var(--danger);border-color:var(--danger);}
.ls-features{display:flex;gap:34px;justify-content:center;flex-wrap:wrap;}
.ls-features button{display:flex;flex-direction:column;align-items:center;gap:6px;background:none;}
.ls-feat-ic{width:42px;height:42px;border-radius:13px;background:var(--surface);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;color:var(--text);transition:all .15s;}
.ls-feat-ic svg{width:20px;height:20px;}
.ls-features button:hover .ls-feat-ic{border-color:var(--accent);color:var(--accent);}
.ls-feat-lbl{font-size:12px;font-weight:600;color:var(--text);}
.ls-feat-kbd{font-size:10px;color:var(--muted);}
/* Layout en dos paneles */
#live-main{flex:1;display:flex;overflow:hidden;}
#live-left{width:42%;min-width:300px;display:flex;flex-direction:column;border-right:1px solid var(--border);}
#live-convo{flex:1;overflow-y:auto;padding:20px 16px;display:flex;flex-direction:column;gap:14px;}
/* ── Burbujas del tutor en vivo (fix: bloque, no columnas) ── */
#live-convo .msg.bot{display:block;background:var(--panel);border:1px solid var(--border);border-radius:4px 16px 16px 16px;padding:12px 16px;box-shadow:var(--shadow);max-width:100%;font-size:14.5px;line-height:1.6;}
#live-convo .msg.bot .bot-name{display:flex;align-items:center;gap:8px;font-weight:700;font-size:13px;color:var(--t-live);margin-bottom:6px;}
#live-convo .msg.bot .bot-name .bot-mascot{width:24px;height:24px;}
#live-convo .msg.bot p{margin:6px 0;}
#live-convo .msg.bot .katex{font-size:1.02em;}
#live-convo .msg.user{align-self:flex-end;background:var(--t-live);color:#fff;border-radius:16px 16px 4px 16px;padding:10px 14px;max-width:85%;}
#live-convo .msg.user b{color:#fff;}

/* ── Pizarra interactiva (panel derecho) ── */
#live-board{flex:1;display:flex;flex-direction:column;position:relative;background:var(--panel);min-width:0;}
.board-title{padding:10px 16px;font-size:13px;font-weight:700;border-bottom:1px solid var(--border);background:var(--panel);display:flex;align-items:center;gap:10px;z-index:3;}
.board-title .board-mode{margin-left:auto;}
.board-mode .seg-btn{padding:5px 10px;font-size:11px;}
.board-acts{display:flex;gap:6px;}
.board-acts button{width:32px;height:32px;border-radius:8px;background:var(--surface);border:1px solid var(--border);font-size:14px;color:var(--text);}
.board-acts button:hover{border-color:var(--t-live);color:var(--t-live);}
/* Superficie tipo cuaderno: clic en cualquier parte para escribir */
#board-surface{flex:1;position:relative;overflow:auto;
  background-color:var(--panel);
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:26px 26px;background-position:-1px -1px;cursor:text;}
#board-surface.draw-mode{cursor:crosshair;}
#draw-canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none;pointer-events:none;z-index:1;}
#board-surface.draw-mode #draw-canvas{pointer-events:auto;}
#board-items{position:absolute;inset:0;z-index:2;pointer-events:none;}
#board-tip{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:13px;color:var(--muted);text-align:center;pointer-events:none;z-index:0;max-width:80%;}
/* Cada paso escrito por el estudiante (caja flotante) */
.board-item{position:absolute;pointer-events:auto;display:flex;align-items:center;gap:8px;}
.board-item .bl-edit{position:relative;min-width:150px;background:var(--panel);border:1.5px solid var(--t-live);border-radius:10px;box-shadow:0 4px 18px rgba(0,0,0,.5);padding:9px 14px;}
.board-item .bl-live{font-size:20px;color:var(--text);min-height:26px;display:flex;align-items:center;white-space:nowrap;}
.board-item .bl-live.empty{color:var(--muted);font-size:14px;}
.board-item .bl-live.prose,.board-item .bl-text.prose{white-space:normal;font-size:15px;line-height:1.45;display:block;max-width:320px;}
/* El input cubre la caja pero es invisible: solo captura el teclado. */
.board-item .bl-input{position:absolute;inset:0;width:100%;height:100%;opacity:0;border:none;background:transparent;font-size:16px;cursor:text;padding:0;margin:0;}
.board-item .bl-input:focus{outline:none;}
.board-item .bl-text{font-size:18px;color:var(--text);background:color-mix(in srgb,var(--panel) 88%,transparent);border-radius:8px;padding:2px 8px;}
.board-item .bl-mark{flex-shrink:0;width:24px;height:24px;border-radius:50%;display:none;align-items:center;justify-content:center;font-size:13px;font-weight:800;}
.board-item.pending .bl-mark{display:flex;color:var(--muted);}
.board-item.ok .bl-mark{display:flex;background:var(--success);color:#fff;}
.board-item.fix .bl-mark{display:flex;background:var(--danger);color:#fff;}
.board-item.fix .bl-text{text-decoration:line-through;color:var(--danger);opacity:.85;}
/* Tarjeta de pista escrita en la pizarra (estilo Mathos) */
.board-hint{position:absolute;pointer-events:auto;max-width:340px;background:color-mix(in srgb,var(--t-live) 16%,var(--panel));border:1px solid color-mix(in srgb,var(--t-live) 40%,var(--border));border-radius:14px;padding:12px 16px;box-shadow:0 6px 22px rgba(0,0,0,.45);z-index:2;}
.board-hint .bh-head{display:flex;align-items:center;gap:6px;font-size:12px;font-weight:800;letter-spacing:.03em;color:var(--t-live);margin-bottom:5px;}
.board-hint .bh-body{font-size:14.5px;line-height:1.5;color:var(--text);}
.board-hint .bh-x{position:absolute;top:6px;right:8px;font-size:13px;color:var(--muted);background:none;}
.bl-img{max-width:160px;max-height:70px;border-radius:6px;border:1px solid var(--border);background:var(--surface);}
/* Teclado matemático flotante */
.fx-btn{flex-shrink:0;width:34px;height:34px;border-radius:8px;background:var(--surface);border:1px solid var(--border);color:var(--t-live);font-size:15px;font-style:italic;font-weight:700;}
.fx-btn.on{background:color-mix(in srgb,var(--t-live) 14%,transparent);border-color:var(--t-live);}
#math-palette{position:absolute;left:14px;right:14px;bottom:14px;z-index:5;background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:12px 14px;box-shadow:var(--shadow-lg);max-height:42vh;overflow-y:auto;}
.mp-tabs{display:flex;gap:4px;flex-wrap:wrap;margin-bottom:14px;border-bottom:1px solid var(--border);}
.mp-tab{padding:8px 14px;font-size:13px;font-weight:600;background:none;color:var(--muted);border-bottom:2px solid transparent;margin-bottom:-1px;transition:color .15s, border-color .15s;}
.mp-tab:hover{color:var(--text);}
.mp-tab.active{color:var(--accent);border-bottom-color:var(--accent);}
.mp-panel{display:flex;gap:22px;flex-wrap:wrap;align-items:flex-start;}
.mp-group{display:grid;grid-template-columns:repeat(4,minmax(46px,1fr));gap:7px;flex:1;min-width:200px;}
.mp-key{min-height:38px;padding:6px 8px;border-radius:9px;background:var(--panel);border:1px solid var(--border);color:var(--text);
  display:flex;align-items:center;justify-content:center;font-size:14px;cursor:pointer;transition:all .12s;box-shadow:0 1px 2px rgba(0,0,0,.03);}
.mp-key:hover{border-color:color-mix(in srgb,var(--accent) 50%,var(--border));background:color-mix(in srgb,var(--accent) 7%,#fff);color:var(--accent);transform:translateY(-1px);}
.mp-key:active{transform:translateY(0);}
.mp-key .katex{font-size:1em;}
.mp-key.wide{grid-column:span 1;}
@media(max-width:760px){.mp-panel{gap:14px;}.mp-group{min-width:150px;grid-template-columns:repeat(4,1fr);}}
@media (max-width:760px){
  #live-main{flex-direction:column;}
  #live-left{width:100%;min-width:0;border-right:none;border-bottom:1px solid var(--border);max-height:42%;}
}

/* ─── Modo Concentración (Fase 5) ────────────────────────────────────────── */
body.focus-mode #topnav,
body.focus-mode #sidebar{display:none;}
#focus-exit{
  display:none;position:fixed;top:14px;right:16px;z-index:1200;
  align-items:center;gap:7px;padding:8px 14px;border-radius:10px;
  background:var(--panel);border:1px solid var(--border);color:var(--text);
  font-size:13px;font-weight:600;box-shadow:var(--shadow);cursor:pointer;
}
#focus-exit:hover{border-color:var(--accent);color:var(--accent);}
body.focus-mode #focus-exit{display:inline-flex;}

/* ─── Bottom navigation móvil (Fase 6) ───────────────────────────────────── */
#bottom-nav{display:none;}
@media (max-width:760px){
  #bottom-nav{
    display:flex;position:fixed;left:0;right:0;bottom:0;z-index:900;
    background:var(--panel);border-top:1px solid var(--border);
    padding:6px 4px calc(6px + env(safe-area-inset-bottom));
    box-shadow:0 -2px 12px rgba(0,0,0,.06);
  }
  .bn-item{
    flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;
    background:none;border:none;color:var(--muted);font-size:10.5px;font-weight:600;
    padding:6px 2px;border-radius:10px;cursor:pointer;min-height:48px;justify-content:center;
  }
  .bn-item svg{width:22px;height:22px;}
  .bn-item.active{color:var(--accent);}
  body.focus-mode #bottom-nav{display:none;}
  /* Espacio para que el contenido no quede tapado por la barra */
  #home-scroll,#tools-scroll{padding-bottom:78px;}
}
.live-helpers{display:flex;gap:8px;flex-wrap:wrap;padding:10px 16px;border-top:1px solid var(--border);background:var(--panel);}
.live-voice{padding:6px 12px;border-radius:18px;font-size:12px;font-weight:600;background:var(--surface);border:1px solid var(--border);color:var(--muted);}
.live-voice.on{background:color-mix(in srgb,var(--t-live) 14%,transparent);border-color:var(--t-live);color:var(--t-live);}
.live-voice.speaking{animation:voicePulse 1s ease-in-out infinite;}
@keyframes voicePulse{0%,100%{box-shadow:0 0 0 0 color-mix(in srgb,var(--t-live) 40%,transparent);}50%{box-shadow:0 0 0 5px transparent;}}
/* Modal de reporte */
#live-report-overlay{display:none;position:fixed;inset:0;background:rgba(20,20,40,.45);backdrop-filter:blur(3px);z-index:1100;align-items:center;justify-content:center;padding:18px;}
#live-report-overlay.open{display:flex;}
#live-report-modal{background:var(--panel);border:1px solid var(--border);border-radius:18px;width:640px;max-width:96vw;max-height:88vh;display:flex;flex-direction:column;box-shadow:var(--shadow-lg);overflow:hidden;}
#lr-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;padding:20px 22px 10px;}
#lr-title{font-size:19px;font-weight:800;}
.lr-summary{font-size:13px;color:var(--muted);line-height:1.5;margin-top:4px;}
.lr-close{background:var(--surface);border:1px solid var(--border);border-radius:8px;width:30px;height:30px;font-size:14px;color:var(--muted);flex-shrink:0;}
#lr-stats{display:flex;gap:8px;flex-wrap:wrap;padding:0 22px 14px;}
.lr-stat{display:flex;align-items:center;gap:6px;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:7px 12px;font-size:12px;font-weight:600;color:var(--text);}
.lr-stat b{color:var(--t-live);font-size:14px;}
#lr-foot{display:flex;gap:8px;justify-content:flex-end;padding:14px 22px;border-top:1px solid var(--border);}
.lr-foot-btn{padding:9px 18px;border-radius:10px;font-size:13px;font-weight:600;}
.lr-foot-btn.ghost{background:var(--surface);border:1px solid var(--border);color:var(--text);}
.lr-foot-btn.primary{background:var(--t-live);color:#fff;}
#lr-tabs{display:flex;gap:4px;padding:0 18px;border-bottom:1px solid var(--border);}
.lr-tab{padding:9px 14px;font-size:13px;font-weight:600;color:var(--muted);background:none;border-bottom:2px solid transparent;}
.lr-tab.active{color:var(--t-live);border-bottom-color:var(--t-live);}
#lr-body{overflow-y:auto;padding:20px 22px;}
.lr-pane{font-size:14px;line-height:1.6;}
.lr-pane h1,.lr-pane h2,.lr-pane h3{font-size:15px;margin:12px 0 6px;}
.lr-pane ul{padding-left:20px;margin:6px 0;}
.lr-pane li{margin:4px 0;}
.lr-skill{display:flex;gap:12px;align-items:flex-start;padding:12px 0;border-bottom:1px solid var(--border);}
.lr-skill:last-child{border-bottom:none;}
.lr-skill-emoji{font-size:20px;flex-shrink:0;}
.lr-skill-name{font-weight:700;font-size:14px;}
.lr-skill-rating{font-size:11px;font-weight:700;padding:1px 8px;border-radius:10px;margin-left:8px;}
.lr-skill-comment{font-size:13px;color:var(--muted);margin-top:2px;}
.live-help{padding:6px 12px;border-radius:18px;font-size:12px;font-weight:600;background:color-mix(in srgb,var(--t-live) 12%,transparent);color:var(--t-live);border:1px solid color-mix(in srgb,var(--t-live) 35%,transparent);}
.live-help:hover{background:color-mix(in srgb,var(--t-live) 20%,transparent);}
.live-help:disabled{opacity:.6;cursor:default;}
.live-help.recording{background:color-mix(in srgb,var(--danger) 16%,transparent);color:var(--danger);border-color:var(--danger);animation:pulse 1s infinite;}
.live-preview{background:var(--surface);border:1px dashed var(--border);border-radius:9px;padding:8px 12px;font-size:14px;color:var(--text);}
.live-preview-label{font-size:10px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-bottom:3px;}
.live-done{text-align:center;background:color-mix(in srgb,var(--success) 12%,transparent);border:1px solid var(--success);border-radius:12px;padding:14px;font-weight:700;color:var(--success);margin:4px 0;}
/* ─── PRÁCTICA GUIADA ────────────────────────────────────────────────────── */
#practice-content{flex:1;overflow-y:auto;padding:28px;display:flex;flex-direction:column;align-items:center;gap:20px;}
#pr-progress-bar{width:100%;max-width:640px;height:4px;background:var(--border);border-radius:2px;}
#pr-progress-fill{height:100%;background:var(--t-practice);border-radius:2px;transition:width .3s;}
#pr-card{width:100%;max-width:640px;background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:28px;}
.pr-step{font-size:11px;color:var(--muted);margin-bottom:12px;}
.pr-q{font-size:16px;font-weight:600;margin-bottom:20px;line-height:1.6;}
.pr-options{display:flex;flex-direction:column;gap:10px;}
.pr-opt{
  padding:12px 16px;border-radius:10px;font-size:14px;text-align:left;
  background:var(--surface2);border:1px solid var(--border);color:var(--text);transition:all .15s;
}
.pr-opt:hover:not(:disabled){border-color:var(--t-practice);}
.pr-opt.correct{background:var(--tint-ok);border-color:var(--success);color:var(--success);}
.pr-opt.wrong{background:var(--tint-bad);border-color:var(--danger);color:var(--danger);}
.pr-hint-btn{
  margin-top:16px;padding:8px 16px;border-radius:9px;font-size:13px;font-weight:600;
  background:color-mix(in srgb,var(--t-practice) 14%,transparent);color:var(--t-practice);
  border:1px solid color-mix(in srgb,var(--t-practice) 40%,transparent);
}
.pr-hint-btn:hover{background:color-mix(in srgb,var(--t-practice) 22%,transparent);}
.pr-hint{
  margin-top:12px;padding:11px 14px;border-radius:10px;font-size:13px;line-height:1.55;
  background:color-mix(in srgb,var(--t-practice) 9%,transparent);
  border-left:3px solid var(--t-practice);color:var(--text);
}
.pr-hint b{color:var(--t-practice);}
.pr-explanation{
  margin-top:16px;padding:13px 15px;border-radius:10px;line-height:1.6;font-size:13.5px;
  background:var(--surface2);color:var(--text);
}
.pr-open{display:flex;gap:8px;flex-wrap:wrap;}
.pr-answer-input{
  flex:1;min-width:160px;background:var(--panel);color:var(--text);border:1.5px solid var(--border);
  border-radius:10px;padding:12px 14px;font-size:15px;
}
.pr-answer-input:focus{outline:none;border-color:var(--t-practice);}
.pr-answer-input:disabled{opacity:.7;}
.pr-check-btn{
  padding:12px 22px;border-radius:10px;font-size:14px;font-weight:600;
  background:var(--t-practice);color:#fff;flex-shrink:0;
}
.pr-check-btn:disabled{opacity:.6;}
.pr-next{margin-top:16px;padding:10px 24px;border-radius:10px;background:var(--t-practice);color:#fff;font-weight:600;}
.pr-feedback{font-size:13px;font-weight:600;margin-top:14px;}
.pr-feedback.ok{color:var(--success);}
.pr-feedback.no{color:var(--danger);}
.pr-score{text-align:center;max-width:420px;}
.pr-score .score-num{font-size:52px;font-weight:800;color:var(--t-practice);}

/* ─── PRUEBA / EXAMEN ────────────────────────────────────────────────────── */
#exam-content{flex:1;overflow-y:auto;padding:28px;}
#exam-timer{font-size:13px;font-weight:700;color:var(--t-exam);margin-left:auto;}
.exam-paper{max-width:780px;margin:0 auto;background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:34px 38px;box-shadow:var(--shadow);}
.exam-toolbar{display:flex;gap:8px;justify-content:flex-end;margin-bottom:18px;flex-wrap:wrap;}
.exam-tool{padding:7px 14px;border-radius:9px;font-size:12px;font-weight:600;background:var(--surface);border:1px solid var(--border);color:var(--text);}
.exam-tool:hover{border-color:var(--t-exam);color:var(--t-exam);}
.exam-title{font-size:22px;font-weight:800;letter-spacing:-.3px;margin-bottom:6px;}
.exam-meta{font-size:12px;color:var(--muted);margin-bottom:14px;}
.exam-instructions{font-size:13px;color:var(--text);background:var(--surface);border-radius:10px;padding:12px 14px;margin-bottom:22px;line-height:1.5;}
.exam-section-name{font-size:14px;font-weight:700;margin:22px 0 12px;padding-bottom:6px;border-bottom:2px solid var(--border);}
.exam-q{margin-bottom:22px;}
.exam-q-head{display:flex;gap:8px;font-size:14px;font-weight:600;line-height:1.5;margin-bottom:8px;}
.exam-q-num{color:var(--t-exam);flex-shrink:0;}
.exam-q-pts{margin-left:auto;font-size:11px;color:var(--muted);font-weight:500;flex-shrink:0;white-space:nowrap;}
.exam-figure{margin:10px 0;}
.exam-figure svg{max-width:100%;height:auto;display:block;}
.exam-opts{display:flex;flex-direction:column;gap:7px;margin:8px 0 0 14px;}
.exam-opt{display:flex;align-items:flex-start;gap:9px;font-size:13.5px;cursor:pointer;padding:7px 10px;border:1px solid var(--border);border-radius:9px;background:var(--surface);}
.exam-opt:hover{border-color:var(--t-exam);}
.exam-opt.sel{border-color:var(--t-exam);background:color-mix(in srgb,var(--t-exam) 12%,transparent);}
.exam-opt.ok{border-color:var(--success);background:var(--tint-ok);}
.exam-opt.bad{border-color:var(--danger);background:var(--tint-bad);}
.exam-open-input{width:100%;background:var(--surface);border:1px solid var(--border);border-radius:9px;padding:10px 12px;font-size:14px;color:var(--text);margin-top:6px;min-height:42px;}
.exam-open-input:focus{outline:none;border-color:var(--t-exam);}
.exam-line{height:1px;background:var(--border);margin:10px 0;}
.exam-work{
  margin-top:10px;border-radius:8px;
  background-image:repeating-linear-gradient(transparent,transparent 27px,var(--border) 28px);
}
.exam-sol{margin-top:10px;padding:11px 14px;border-radius:9px;background:var(--surface2);font-size:13px;line-height:1.55;border-left:3px solid var(--t-exam);}
.exam-sol-label{font-size:10px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:700;margin-bottom:4px;}
.exam-submit{margin-top:24px;padding:12px 26px;border-radius:11px;background:var(--t-exam);color:#fff;font-weight:700;font-size:14px;}
.exam-result{text-align:center;padding:18px;margin-bottom:20px;border-radius:14px;background:var(--surface);border:1px solid var(--border);}
.exam-result .score-num{font-size:46px;font-weight:800;color:var(--t-exam);}
.q-verdict{font-size:12px;font-weight:700;margin-top:6px;}
.q-verdict.ok{color:var(--success);}
.q-verdict.bad{color:var(--danger);}
@media print{
  body *{visibility:hidden;}
  #exam-content,#exam-content *{visibility:visible;}
  #exam-content{position:absolute;inset:0;overflow:visible;padding:0;}
  .exam-toolbar{display:none;}
  .exam-paper{box-shadow:none;border:none;max-width:100%;}
}

/* ─── RESUMEN ────────────────────────────────────────────────────────────── */
#summary-content{flex:1;overflow-y:auto;padding:28px;}
#summary-output{max-width:760px;margin:0 auto;}
#summary-output h1,#summary-output h2{margin:16px 0 8px;font-size:17px;}
#summary-output h3{margin:12px 0 6px;font-size:15px;color:var(--t-summary);}
#summary-output p{margin:6px 0;line-height:1.7;}
#summary-output ul,#summary-output ol{padding-left:22px;margin:6px 0;}
#summary-output li{margin:4px 0;line-height:1.6;}
#summary-output strong{color:var(--text);}
#summary-output code{background:var(--surface2);padding:2px 6px;border-radius:5px;font-size:12px;}
#summary-output blockquote{border-left:3px solid var(--accent);padding-left:12px;color:var(--muted);margin:8px 0;}
.summary-placeholder{color:var(--muted);text-align:center;margin:60px auto;max-width:400px;line-height:1.8;}
.summary-placeholder .big{font-size:36px;margin-bottom:12px;}

/* ─── MAPA MENTAL ────────────────────────────────────────────────────────── */
#mindmap-content{flex:1;overflow:hidden;display:flex;align-items:flex-start;justify-content:flex-start;background:var(--bg);}
#mm-svg-wrap{position:relative;display:block;width:100%;height:100%;cursor:grab;}
#mm-svg-wrap.dragging{cursor:grabbing;}
#mm-svg-wrap svg{display:block;will-change:transform;}
/* Animacion de entrada escalonada (estilo NotebookLM) */
@keyframes mmPop{from{opacity:0;transform:scale(.7);}to{opacity:1;transform:scale(1);}}
@keyframes mmDraw{to{stroke-dashoffset:0;}}
.mm-enter{opacity:0;animation:mmPop .5s cubic-bezier(.34,1.56,.64,1) forwards;transform-box:fill-box;transform-origin:center;}
.mm-node{transition:transform .16s ease;transform-box:fill-box;transform-origin:center;}
.mm-node.clickable{cursor:pointer;}
.mm-node.clickable:hover{transform:scale(1.05);}
.mm-link{stroke-dashoffset:9999;}
.mm-toggle{cursor:pointer;}
.mm-toggle:hover circle{filter:brightness(.95);}
.mm-placeholder{color:var(--muted);text-align:center;margin:auto;max-width:360px;line-height:1.8;}
.mm-placeholder .big{font-size:36px;margin-bottom:12px;}
/* zoom controls */
#mm-controls{position:absolute;top:12px;right:12px;display:flex;flex-direction:column;gap:4px;}
#mm-controls button{
  width:30px;height:30px;border-radius:8px;font-size:16px;font-weight:700;
  background:var(--surface2);color:var(--text);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;transition:background .15s;
}
#mm-controls button:hover{background:var(--surface);}

/* ─── ENSAYO ─────────────────────────────────────────────────────────────── */
#essay-content{flex:1;display:grid;grid-template-columns:1fr 1fr;gap:0;overflow:hidden;}
#essay-input-area{
  display:flex;flex-direction:column;border-right:1px solid var(--border);overflow:hidden;
}
#essay-label{padding:14px 18px;font-size:12px;font-weight:600;color:var(--muted);border-bottom:1px solid var(--border);}
#essay-textarea{
  flex:1;background:var(--surface);color:var(--text);border:none;
  padding:18px;font-size:13px;resize:none;line-height:1.7;
}
#essay-textarea:focus{outline:none;}
#essay-submit-bar{padding:12px 18px;border-top:1px solid var(--border);background:var(--panel);}
#essay-submit{padding:8px 20px;border-radius:9px;background:var(--grad);color:#fff;font-weight:600;font-size:13px;}
#essay-feedback-area{display:flex;flex-direction:column;overflow:hidden;}
#essay-fb-label{padding:14px 18px;font-size:12px;font-weight:600;color:var(--muted);border-bottom:1px solid var(--border);}
#essay-feedback{flex:1;overflow-y:auto;padding:18px;}
#essay-feedback h1,#essay-feedback h2,#essay-feedback h3{margin:12px 0 6px;font-size:14px;color:var(--t-essay);}
#essay-feedback p{margin:5px 0;font-size:13px;line-height:1.6;}
#essay-feedback ul{padding-left:18px;}
#essay-feedback li{margin:3px 0;font-size:13px;}
#essay-feedback strong{color:var(--text);}
.essay-placeholder{color:var(--muted);text-align:center;margin:auto;padding:40px;line-height:1.8;}

/* ─── Loading spinner ────────────────────────────────────────────────────── */
.spinner{
  display:inline-block;width:20px;height:20px;border:2px solid var(--border);
  border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg);}}
.loading-state{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:13px;justify-content:center;padding:40px;}
.error-state{color:var(--danger);font-size:13px;text-align:center;padding:20px;}

/* ─── GRAFICADOR (Desmos) ────────────────────────────────────────────────── */
#grapher-body{flex:1;position:relative;overflow:hidden;}
#grapher-calc{position:absolute;inset:0;width:100%;height:100%;}

/* ─── ANALYTICS ──────────────────────────────────────────────────────────── */
#analytics-body{flex:1;overflow-y:auto;padding:24px 28px 44px;max-width:1000px;margin:0 auto;width:100%;}
#analytics-body{flex:1;overflow-y:auto;padding:28px 36px 44px;max-width:1240px;margin:0 auto;width:100%;}
.an-pagehead{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:24px;flex-wrap:wrap;}
.an-h1{font-family:"Montserrat",system-ui,sans-serif;font-size:28px;font-weight:800;letter-spacing:-.02em;color:var(--text);}
.an-sub{font-size:14px;color:var(--muted);margin-top:4px;}
.an-range{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--text);background:var(--panel);border:1px solid var(--border);border-radius:11px;padding:9px 14px;box-shadow:var(--shadow);}
/* KPIs */
#an-kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:18px;}
.an-kpi{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:18px;box-shadow:var(--shadow);transition:transform .2s, box-shadow .2s;overflow:hidden;}
.an-kpi:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}
.an-kpi-top{display:flex;align-items:center;gap:11px;margin-bottom:14px;}
.an-kpi-ic{width:40px;height:40px;border-radius:11px;flex-shrink:0;display:flex;align-items:center;justify-content:center;color:#fff;
  background:linear-gradient(135deg,color-mix(in srgb,var(--kc) 80%,#fff),var(--kc));box-shadow:0 4px 10px color-mix(in srgb,var(--kc) 26%,transparent);}
.an-kpi-ic svg{width:21px;height:21px;stroke:#fff;}
.an-kpi-lbl{font-size:13px;color:var(--muted);font-weight:500;}
.an-kpi-num{font-family:"Montserrat",system-ui,sans-serif;font-size:30px;font-weight:800;letter-spacing:-.02em;color:var(--text);line-height:1;}
.an-kpi-num small{font-size:15px;font-weight:600;color:var(--muted);}
.an-kpi-delta{font-size:12px;font-weight:600;color:var(--success);margin-top:7px;}
.an-kpi-spark{margin-top:10px;height:34px;}
.an-kpi-spark svg{width:100%;height:34px;display:block;}
/* Cards */
#an-charts{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.an-card{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:20px;box-shadow:var(--shadow);}
.an-card-wide{grid-column:1 / -1;}
.an-card-head{display:flex;align-items:baseline;justify-content:space-between;gap:10px;margin-bottom:16px;flex-wrap:wrap;}
.an-card-title{font-family:"Montserrat",system-ui,sans-serif;font-size:16px;font-weight:700;color:var(--text);}
.an-card-sub{font-size:12.5px;color:var(--muted);}
.an-canvas-wrap{position:relative;height:240px;}
.an-empty{font-size:13px;color:var(--muted);text-align:center;padding:40px 10px;line-height:1.6;}
/* Donut + legend */
.an-donut-row{display:flex;align-items:center;gap:24px;flex-wrap:wrap;}
.an-donut-wrap{position:relative;width:200px;height:200px;flex-shrink:0;}
.an-donut-center{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;pointer-events:none;}
.an-donut-center b{font-family:"Montserrat",system-ui,sans-serif;font-size:30px;font-weight:800;color:var(--text);line-height:1;}
.an-donut-center span{font-size:11px;color:var(--muted);margin-top:3px;line-height:1.2;}
#an-topic-legend{flex:1;min-width:180px;display:flex;flex-direction:column;gap:9px;}
.an-leg{display:flex;align-items:center;gap:9px;font-size:13px;}
.an-leg-dot{width:10px;height:10px;border-radius:3px;flex-shrink:0;}
.an-leg-name{flex:1;color:var(--text);text-transform:capitalize;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.an-leg-pct{font-weight:700;color:var(--text);}
/* Repaso table */
#an-repaso{display:flex;flex-direction:column;}
.an-rep-head,.an-rep-row{display:grid;grid-template-columns:1.4fr 2fr 1fr 0.7fr;gap:14px;align-items:center;}
.an-rep-head{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);padding:0 4px 10px;border-bottom:1px solid var(--border);}
.an-rep-row{padding:13px 4px;border-bottom:1px solid var(--border);font-size:13.5px;}
.an-rep-row:last-child{border-bottom:none;}
.an-rep-mat{display:flex;align-items:center;gap:10px;font-weight:600;color:var(--text);text-transform:capitalize;}
.an-rep-mat-ic{width:30px;height:30px;border-radius:9px;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:15px;background:var(--surface);}
.an-rep-ret{display:flex;align-items:center;gap:10px;}
.an-rep-pct{font-weight:700;width:42px;flex-shrink:0;}
.an-rep-bars{flex:1;display:flex;gap:3px;}
.an-rep-seg{flex:1;height:7px;border-radius:2px;background:var(--surface2);}
.an-rep-next{font-size:12.5px;font-weight:600;}
.an-rep-cards{font-variant-numeric:tabular-nums;color:var(--muted);text-align:right;}
@media (max-width:820px){
  #an-kpis{grid-template-columns:repeat(2,1fr);}
  #an-charts{grid-template-columns:1fr;}
  .an-rep-head{display:none;}
  .an-rep-row{grid-template-columns:1fr 1fr;gap:8px;}
}

/* ─── CALENDARIO ─────────────────────────────────────────────────────────── */
#calendar-body{flex:1;overflow-y:auto;padding:28px 36px 44px;max-width:1240px;margin:0 auto;width:100%;}
.cal-pagehead{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px;}
.cal-h1{font-family:"Montserrat",system-ui,sans-serif;font-size:28px;font-weight:800;letter-spacing:-.02em;color:var(--text);}
.cal-new{display:inline-flex;align-items:center;gap:8px;background:var(--grad);color:#fff;font-size:14px;font-weight:600;padding:11px 18px;border-radius:12px;box-shadow:0 4px 14px rgba(37,99,235,.28);transition:transform .15s, box-shadow .2s;}
.cal-new:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(37,99,235,.4);}
.cal-top{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:18px;flex-wrap:wrap;}
.cal-toolbar{display:flex;align-items:center;gap:10px;}
#cal-month-label{font-family:"Montserrat",system-ui,sans-serif;font-size:18px;font-weight:700;letter-spacing:-.01em;text-transform:capitalize;margin-left:6px;}
.cal-arrow{width:36px;height:36px;border-radius:10px;background:var(--panel);border:1px solid var(--border);color:var(--text);font-size:18px;line-height:1;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);}
.cal-arrow:hover{border-color:var(--accent);color:var(--accent);}
.cal-today-btn{padding:8px 16px;border-radius:10px;background:var(--panel);border:1px solid var(--border);color:var(--text);font-size:13px;font-weight:600;box-shadow:var(--shadow);}
.cal-today-btn:hover{border-color:var(--accent);color:var(--accent);}
.cal-viewseg{display:inline-flex;background:var(--surface2);border-radius:11px;padding:3px;gap:2px;}
.cal-viewseg button{padding:7px 16px;border-radius:8px;font-size:13px;font-weight:600;color:var(--muted);background:none;transition:all .15s;}
.cal-viewseg button.active{background:var(--panel);color:var(--accent);box-shadow:var(--shadow);}
/* 2 columnas */
.cal-cols{display:grid;grid-template-columns:1fr 320px;gap:24px;align-items:start;}
.cal-main{background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:16px;box-shadow:var(--shadow);}
#cal-weekdays{display:grid;grid-template-columns:repeat(7,1fr);gap:8px;margin-bottom:8px;}
#cal-weekdays span{font-size:11px;font-weight:700;color:var(--muted);text-align:left;padding-left:4px;text-transform:uppercase;letter-spacing:.04em;}
#cal-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:8px;}
.cal-cell{min-height:92px;border-radius:10px;background:var(--panel);border:1px solid var(--border);padding:7px 8px;cursor:pointer;transition:border-color .18s,box-shadow .18s;display:flex;flex-direction:column;gap:3px;overflow:hidden;}
.cal-cell:hover{border-color:color-mix(in srgb,var(--accent) 40%,var(--border));box-shadow:var(--shadow);}
.cal-cell.other{opacity:.45;background:var(--surface);}
.cal-daynum{font-size:13px;font-weight:600;color:var(--text);width:26px;height:26px;display:flex;align-items:center;justify-content:center;}
.cal-cell.today .cal-daynum{color:#fff;background:var(--accent);border-radius:50%;font-weight:700;box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 18%,transparent);}
.cal-ev{font-size:10.5px;font-weight:600;border-radius:6px;padding:3px 7px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;line-height:1.4;}
.cal-ev.study{background:color-mix(in srgb,var(--accent) 14%,transparent);color:var(--accent);}
.cal-ev.exam{background:color-mix(in srgb,#d97706 16%,transparent);color:#b45309;}
.cal-ev.task{background:color-mix(in srgb,var(--success) 16%,transparent);color:#15803d;}
.cal-more{font-size:10px;color:var(--muted);font-weight:600;}
/* Panel lateral */
.cal-side{display:flex;flex-direction:column;gap:18px;position:sticky;top:8px;}
.cal-up-row{display:flex;flex-direction:column;gap:2px;padding:12px 14px;border-radius:12px;background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--accent);margin-bottom:10px;cursor:pointer;transition:all .15s;}
.cal-up-row:last-child{margin-bottom:0;}
.cal-up-row.exam{border-left-color:#d97706;}
.cal-up-row.task{border-left-color:var(--success);}
.cal-up-row:hover{box-shadow:var(--shadow);transform:translateX(2px);}
.cal-up-when{font-size:11.5px;font-weight:600;color:var(--accent);display:flex;align-items:center;gap:6px;}
.cal-up-row.exam .cal-up-when{color:#b45309;}
.cal-up-row.task .cal-up-when{color:#15803d;}
.cal-up-name{font-size:14px;font-weight:600;color:var(--text);}
.cal-up-empty{font-size:13px;color:var(--muted);padding:8px 0;line-height:1.5;}
.cal-cta-card{background:linear-gradient(160deg, color-mix(in srgb,var(--accent) 12%,var(--panel)), var(--panel));border:1px solid var(--border);border-radius:18px;padding:22px;text-align:center;box-shadow:var(--shadow);}
.cal-cta-ic{width:54px;height:54px;border-radius:15px;margin:0 auto 14px;display:flex;align-items:center;justify-content:center;color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,transparent);}
.cal-cta-ic svg{width:26px;height:26px;}
.cal-cta-title{font-family:"Montserrat",system-ui,sans-serif;font-size:15px;font-weight:700;color:var(--text);margin-bottom:5px;line-height:1.3;}
.cal-cta-d{font-size:12.5px;color:var(--muted);line-height:1.5;margin-bottom:16px;}
.cal-cta-card .cal-new{width:100%;justify-content:center;}
@media(max-width:900px){.cal-cols{grid-template-columns:1fr;}.cal-side{position:static;}}
#cal-modal-overlay{display:none;position:fixed;inset:0;background:rgba(4,4,18,.6);backdrop-filter:blur(8px);z-index:1000;align-items:center;justify-content:center;}
#cal-modal-overlay.open{display:flex;}
#cal-modal{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:26px;width:420px;max-width:92vw;box-shadow:var(--shadow-lg);animation:modalSlideIn .22s cubic-bezier(.4,0,.2,1);}
html[data-theme="dark"] #cal-modal{
  background:rgba(8,6,22,0.88);
  backdrop-filter:blur(24px) saturate(160%);
  -webkit-backdrop-filter:blur(24px) saturate(160%);
  border:1px solid rgba(251,146,60,0.2);
  box-shadow:0 0 0 1px rgba(251,146,60,0.12), 0 32px 80px rgba(0,0,0,.7);
}
#cal-modal h3{font-size:16px;font-weight:700;margin-bottom:18px;}
#cal-modal .modal-field select,#cal-modal .modal-field input{width:100%;background:var(--surface);border:1px solid var(--border);border-radius:9px;padding:10px 12px;color:var(--text);font-size:14px;}
#cal-modal .modal-field input:focus,#cal-modal .modal-field select:focus{outline:none;border-color:var(--t-calendar);}

/* ─── CLASES ─────────────────────────────────────────────────────────────── */
#classes-content{flex:1;overflow-y:auto;padding:28px;}
.classes-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;}
.classes-title{font-size:20px;font-weight:700;}
.btn-new-class{
  display:flex;align-items:center;gap:6px;padding:9px 18px;
  background:var(--grad);color:#fff;border-radius:10px;font-size:13px;font-weight:600;
  box-shadow:0 2px 12px rgba(91,108,240,.3);transition:opacity .15s;
}
.btn-new-class:hover{opacity:.88;}
.classes-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:18px;}
.class-card{
  background:var(--surface);border:1px solid var(--border);border-radius:16px;
  overflow:hidden;transition:border-color .15s;
}
.class-card:hover{border-color:var(--accent);}
.class-card-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 18px;border-bottom:1px solid var(--border);cursor:pointer;
}
.class-card-name{font-size:15px;font-weight:700;display:flex;align-items:center;gap:8px;}
.class-card-name .cc-icon{
  width:32px;height:32px;border-radius:9px;background:var(--grad);
  display:flex;align-items:center;justify-content:center;font-size:15px;flex-shrink:0;
}
.class-card-meta{font-size:11px;color:var(--muted);}
.class-card-actions{display:flex;gap:6px;}
.cc-btn{
  padding:5px 10px;border-radius:7px;font-size:12px;font-weight:500;
  background:var(--surface2);color:var(--text);border:1px solid var(--border);
  transition:all .15s;
}
.cc-btn:hover{background:var(--border);border-color:var(--accent);color:var(--accent);}
.cc-btn.danger:hover{background:var(--tint-bad);border-color:var(--danger);color:var(--danger);}
.class-units{padding:12px 18px 16px;}
.unit-block{margin-bottom:14px;}
.unit-name{
  font-size:12px;font-weight:600;color:var(--accent);
  display:flex;align-items:center;justify-content:space-between;margin-bottom:6px;
}
.unit-files{display:flex;flex-direction:column;gap:4px;}
.file-row{
  display:flex;align-items:center;gap:8px;padding:7px 10px;
  background:var(--surface2);border:1px solid var(--border);border-radius:8px;
  font-size:12px;
}
.file-row .file-icon{font-size:13px;flex-shrink:0;}
.file-row .file-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text);}
.file-row .file-size{font-size:10px;color:var(--muted);flex-shrink:0;}
.file-row .file-del{
  background:none;color:var(--muted);font-size:13px;padding:2px 5px;border-radius:4px;flex-shrink:0;
  transition:all .15s;
}
.file-row .file-del:hover{color:var(--danger);background:var(--tint-bad);}
.no-files{font-size:12px;color:var(--muted);padding:10px 2px;}
/* Lista plana de archivos (nuevo modelo sin unidades) */
.class-files{padding:14px 18px 6px;display:flex;flex-direction:column;gap:6px;}
.class-foot{padding:6px 18px 16px;display:flex;align-items:center;gap:10px;}
.cc-add{
  padding:8px 14px;border-radius:9px;font-size:13px;font-weight:600;
  background:color-mix(in srgb,var(--t-classes) 14%,transparent);color:var(--t-classes);
  border:1px solid color-mix(in srgb,var(--t-classes) 40%,transparent);
}
.cc-add:hover{background:color-mix(in srgb,var(--t-classes) 24%,transparent);}
.cc-drop-hint{font-size:11px;color:var(--muted);}
.class-card.dragover{border-color:var(--t-classes);box-shadow:0 0 0 3px color-mix(in srgb,var(--t-classes) 18%,transparent);}
.empty-classes{text-align:center;color:var(--muted);margin-top:80px;line-height:1.9;}
.empty-classes .big{font-size:48px;margin-bottom:16px;}

/* modal */
#class-modal-overlay{
  display:none;position:fixed;inset:0;background:rgba(0,0,0,.65);
  z-index:1000;align-items:center;justify-content:center;
}
#class-modal-overlay.open{display:flex;}
#class-modal{
  background:var(--surface);border:1px solid var(--border);border-radius:16px;
  padding:28px;width:420px;max-width:95vw;
}
#class-modal h3{font-size:16px;font-weight:700;margin-bottom:18px;}
.modal-field{margin-bottom:14px;}
.modal-field label{display:block;font-size:12px;color:var(--muted);margin-bottom:5px;}
.modal-field input{
  width:100%;background:var(--surface2);border:1px solid var(--border);
  border-radius:8px;padding:9px 12px;color:var(--text);font-size:13px;
}
.modal-field input:focus{outline:none;border-color:var(--accent);}
.modal-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:20px;}
.modal-cancel{padding:8px 18px;background:var(--surface2);color:var(--muted);border-radius:8px;font-size:13px;border:1px solid var(--border);}
.modal-submit{padding:8px 18px;background:var(--grad);color:#fff;border-radius:8px;font-size:13px;font-weight:600;}

/* Chip de perfil en la sidebar */
#profile-chip{
  display:flex;align-items:center;gap:8px;padding:8px 10px;
  background:var(--surface);border:1px solid var(--border);border-radius:12px;cursor:pointer;
  transition:border-color .15s;
}
#profile-chip:hover{border-color:var(--accent);}
#profile-avatar{font-size:18px;width:30px;height:30px;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;}
#profile-avatar.has-photo{border-radius:50%;overflow:hidden;border:1.5px solid var(--border);}
#profile-avatar.has-photo img{width:100%;height:100%;object-fit:cover;display:block;}
#profile-name{flex:1;font-size:13px;font-weight:600;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
#profile-switch{font-size:10px;color:var(--accent);font-weight:600;flex-shrink:0;}

/* Modal de perfil */
/* ─── Pantalla de autenticación (página completa) ───────────────────────── */
#profile-modal-overlay{
  display:none;position:fixed;inset:0;z-index:1100;overflow-y:auto;
  background:
    radial-gradient(circle at 50% -10%, rgba(37,99,235,.08), transparent 55%),
    radial-gradient(circle at 90% 110%, rgba(124,99,255,.06), transparent 50%),
    var(--bg);
}
#profile-modal-overlay.open{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;padding:64px 20px;}
#auth-screen{width:100%;max-width:420px;text-align:center;animation:modalSlideIn .25s cubic-bezier(.4,0,.2,1);}
@keyframes modalSlideIn{from{opacity:0;transform:translateY(14px);}to{opacity:1;transform:none;}}
.auth-brand{margin-bottom:26px;}
.auth-brand img{height:34px;width:auto;}
#auth-title{font-family:"Montserrat",system-ui,sans-serif;font-size:30px;font-weight:800;letter-spacing:-.02em;color:var(--text);margin-bottom:8px;}
#auth-sub{font-size:15px;color:var(--muted);margin-bottom:28px;}
.auth-card{background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:30px 28px;box-shadow:0 4px 24px rgba(37,99,235,.07);text-align:left;}
#auth-error{display:none;font-size:12.5px;color:var(--danger);background:color-mix(in srgb,var(--danger) 10%,transparent);border:1px solid color-mix(in srgb,var(--danger) 25%,transparent);border-radius:10px;padding:10px 13px;margin-bottom:16px;line-height:1.45;}
#auth-error.show{display:block;}
.auth-group{margin-bottom:16px;}
.auth-group label{display:block;font-size:13px;font-weight:600;color:var(--text);margin-bottom:7px;}
.auth-group input,.auth-group select{
  width:100%;background:var(--surface);border:1px solid var(--border);border-radius:11px;
  padding:12px 14px;color:var(--text);font-size:14.5px;transition:border-color .15s, box-shadow .15s;
}
.auth-group input:focus,.auth-group select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 14%,transparent);}
.auth-group input::placeholder{color:var(--muted);}
#auth-submit{
  width:100%;margin-top:6px;padding:13px;border-radius:12px;font-size:15px;font-weight:700;
  background:var(--grad);color:#fff;box-shadow:0 4px 14px rgba(37,99,235,.28);
  transition:transform .15s, box-shadow .2s;
}
#auth-submit:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(37,99,235,.4);}
#auth-submit:disabled{opacity:.65;cursor:wait;transform:none;}
#auth-toggle{font-size:13.5px;color:var(--muted);margin-top:16px;text-align:center;}
#auth-toggle a{color:var(--accent);font-weight:600;cursor:pointer;}
#auth-toggle a:hover{text-decoration:underline;}
.auth-or{display:flex;align-items:center;gap:12px;margin:20px 0;color:var(--muted);font-size:12px;font-weight:600;}
.auth-or::before,.auth-or::after{content:"";flex:1;height:1px;background:var(--border);}
.auth-google{
  width:100%;display:flex;align-items:center;justify-content:center;gap:10px;
  padding:12px;border-radius:12px;font-size:14.5px;font-weight:600;color:var(--text);
  background:var(--panel);border:1px solid var(--border);box-shadow:var(--shadow);transition:all .15s;
}
.auth-google:hover{border-color:var(--accent);background:var(--surface);}
/* ─── Paywall (Apex Pro) ─────────────────────────────────────────────────── */
#paywall-overlay{display:none;position:fixed;inset:0;z-index:1200;background:rgba(15,23,42,.55);backdrop-filter:blur(6px);align-items:center;justify-content:center;padding:20px;}
#paywall-overlay.open{display:flex;}
#paywall{position:relative;width:400px;max-width:94vw;background:var(--panel);border:1px solid var(--border);border-radius:22px;padding:34px 30px 26px;text-align:center;box-shadow:var(--shadow-lg);animation:modalSlideIn .25s cubic-bezier(.4,0,.2,1);}
.paywall-x{position:absolute;top:14px;right:16px;width:30px;height:30px;border-radius:8px;background:none;color:var(--muted);font-size:14px;}
.paywall-x:hover{background:var(--surface);color:var(--text);}
.paywall-ic{width:60px;height:60px;border-radius:17px;margin:0 auto 16px;display:flex;align-items:center;justify-content:center;background:#fff;border:1px solid var(--border);box-shadow:0 6px 18px rgba(37,99,235,.22);padding:11px;}
.paywall-ic svg{width:30px;height:30px;stroke:#fff;}
.paywall-ic img{width:100%;height:100%;object-fit:contain;display:block;}
.paywall-title{font-family:"Montserrat",system-ui,sans-serif;font-size:24px;font-weight:800;color:var(--text);margin-bottom:8px;}
.paywall-reason{font-size:13.5px;color:var(--muted);line-height:1.5;margin-bottom:18px;}
.paywall-price{margin-bottom:18px;}
.paywall-price b{font-family:"Montserrat",system-ui,sans-serif;font-size:42px;font-weight:800;color:var(--text);letter-spacing:-.02em;}
.paywall-price span{font-size:16px;color:var(--muted);font-weight:600;}
.paywall-list{list-style:none;text-align:left;margin:0 0 22px;display:flex;flex-direction:column;gap:11px;}
.paywall-list li{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--text);}
.paywall-list li b{color:var(--accent);}
.paywall-list svg{width:19px;height:19px;stroke:var(--success);flex-shrink:0;}
.paywall-cta{width:100%;padding:14px;border-radius:13px;font-size:15px;font-weight:700;background:var(--grad);color:#fff;box-shadow:0 4px 16px rgba(37,99,235,.32);transition:transform .15s, box-shadow .2s;}
.paywall-cta:hover{transform:translateY(-1px);box-shadow:0 6px 22px rgba(37,99,235,.45);}
.paywall-cta:disabled{opacity:.65;cursor:wait;}
.paywall-later{width:100%;margin-top:10px;padding:10px;font-size:13px;font-weight:600;color:var(--muted);background:none;}
.paywall-later:hover{color:var(--text);}
/* Planes (Pro vs Ilimitado) */
.plan-cards{display:flex;gap:12px;margin:4px 0 6px;}
.plan-card{flex:1;position:relative;border:1px solid var(--border);border-radius:14px;padding:16px 14px;background:var(--surface);display:flex;flex-direction:column;text-align:center;}
.plan-card.featured{border-color:var(--accent);box-shadow:0 0 0 2px color-mix(in srgb,var(--accent) 22%,transparent);}
.plan-badge{position:absolute;top:-10px;left:50%;transform:translateX(-50%);background:var(--accent);color:#fff;font-size:10px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;padding:3px 9px;border-radius:20px;white-space:nowrap;}
.plan-name{font-family:"Montserrat",system-ui,sans-serif;font-size:15px;font-weight:800;color:var(--text);margin-bottom:4px;}
.plan-price{margin-bottom:12px;}
.plan-price b{font-family:"Montserrat",system-ui,sans-serif;font-size:26px;font-weight:800;color:var(--text);letter-spacing:-.02em;}
.plan-price span{display:block;font-size:11px;color:var(--muted);font-weight:600;}
.plan-list{list-style:none;text-align:left;margin:0 0 14px;padding:0;display:flex;flex-direction:column;gap:8px;flex:1;}
.plan-list li{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--text);}
.plan-list li b{color:var(--accent);}
.plan-list svg{width:16px;height:16px;stroke:var(--success);flex-shrink:0;}
.plan-card .paywall-cta{margin-top:auto;font-size:13.5px;padding:11px;}
@media(max-width:480px){.plan-cards{flex-direction:column;}}
/* Modo "límite diario alcanzado" (usuarios Pro): solo mensaje + cerrar. */
#paywall-overlay.daily-limit .plan-cards{display:none;}
#paywall-overlay.daily-limit .paywall-title::after{content:" — límite diario";font-size:14px;font-weight:600;color:var(--muted);}
#paywall-overlay.daily-limit .paywall-later{margin-top:18px;color:var(--accent);}

/* ─── Botón de menú (hamburguesa) y backdrop ─────────────────────────────── */
#menu-toggle{display:none;background:none;border:none;font-size:20px;color:var(--text);
  padding:4px 9px;margin-right:2px;border-radius:8px;cursor:pointer;align-items:center;justify-content:center;}
#menu-toggle:hover{background:var(--surface);}
#sidebar-backdrop{display:none;position:fixed;inset:0;background:rgba(20,30,60,.4);z-index:40;}
#sidebar-backdrop.open{display:block;}

/* ─── RESPONSIVE / MÓVIL ─────────────────────────────────────────────────── */
@media (max-width:820px){
  #menu-toggle{display:flex;}
  .logo-text{display:none;}
  #logo{margin-right:6px;}
  #topnav{gap:2px;padding:0 10px;overflow-x:auto;-webkit-overflow-scrolling:touch;}
  #topnav::-webkit-scrollbar{display:none;}
  .nav-tab{padding:6px 9px;font-size:12px;white-space:nowrap;flex-shrink:0;}
  #nav-subject{display:none;}

  /* Sidebar como cajón deslizante */
  #sidebar{position:fixed;top:52px;left:0;height:calc(100% - 52px);width:82vw;max-width:300px;margin:0;border-radius:0;
    z-index:50;transform:translateX(-100%);transition:transform .22s ease;box-shadow:var(--shadow-lg);}
  #sidebar.open{transform:translateX(0);}
  #main{width:100%;}

  /* Inicio / hub */
  #home-scroll,#tools-scroll{padding:18px 14px 40px;}
  #home-hero{padding:20px 18px;border-radius:18px;gap:12px;}
  #hero-clock{font-size:24px;}
  #hero-lead{font-size:23px;}
  #home-stats{grid-template-columns:1fr 1fr;gap:11px;}
  #home-hero-actions .hero-btn{padding:9px 14px;font-size:12px;}
  #tools-hub-grid{grid-template-columns:1fr 1fr;gap:12px;}
  #home-quicktools{grid-template-columns:1fr 1fr;gap:11px;}
  .qt-card{padding:15px 15px 14px;gap:11px;}
  .qt-title{font-size:15px;}
  .qt-badge{width:40px;height:40px;border-radius:12px;}
  .qt-badge svg{width:21px;height:21px;}
  .tools-hub-title{font-size:20px;}

  /* Herramientas: headers e inputs */
  .tool-header{padding:9px 12px;gap:6px;}
  .tool-input{flex:1;min-width:0;max-width:none!important;}
  .tool-count{flex:0 0 56px;}

  /* Chat */
  #messages{padding:16px 12px;}
  .msg{max-width:100%;}
  #chat-form{padding:9px 12px;}
  #chat-img-btn span.lbl,#chat-audio-btn span.lbl{display:none;}

  /* Clases / tareas / progreso */
  .classes-grid{grid-template-columns:1fr;}
  #home-progress{grid-template-columns:1fr;}
  /* Prueba */
  #exam-content{padding:14px;}
  .exam-paper{padding:22px 18px;}
  #tasks-add-row{flex-direction:column;}
  #tasks-add-btn{width:100%;}

  /* Tarjetas de práctica/quiz a ancho completo */
  #pr-card,#quiz-card,.flashcard{max-width:100%;}
}
@media (max-width:480px){
  .nav-tab{font-size:0;padding:6px 8px;gap:0;}
  .nav-tab .tab-icon{font-size:18px;}
  #tools-hub-grid{grid-template-columns:1fr;}
}