/* ═══════════════════════════════════════════════════════════════
   LEARNING HUB — Design System (Platzi-inspired)
   ═══════════════════════════════════════════════════════════════ */
*{margin:0;padding:0;box-sizing:border-box}

/* User widget: siempre fijo en esquina superior derecha. En páginas
   con .xp-bar (módulos) queda centrado verticalmente dentro de la
   barra sticky; en landing/admin sin xp-bar queda pegado al tope. */
#userWidget{position:fixed;top:5px;right:14px;z-index:10000}
:root{
  --bg:#0b0d13;
  --bg-2:#121520;
  --bg-card:#181c28;
  --bg-hover:#1f2433;
  --bg-elevated:#1c2030;
  --border:#262b3a;
  --border-light:#2f3547;
  --text:#f1f3fa;
  --text-d:#8a91a8;
  --text-dd:#5f667c;
  --primary:#98ca3f;
  --primary-d:#7aa82f;
  --primary-glow:rgba(152,202,63,.15);
  --on-primary:#0b0d13; /* texto/iconos sobre fondo --primary. Verde lima → negro OK (contrast 11:1). */
  --accent:#6c63ff;
  --accent-2:#38bdf8;
  --warn:#f59e0b;
  --danger:#ef4444;
  --success:#22c55e;
  --radius:14px;
  --radius-lg:20px;
  --shadow-sm:0 1px 0 rgba(255,255,255,.04) inset,0 1px 2px rgba(0,0,0,.4);
  --shadow:0 1px 0 rgba(255,255,255,.04) inset,0 4px 10px rgba(0,0,0,.45),0 1px 2px rgba(0,0,0,.5);
  /* Glow sutil: borde 1px + sombra discreta. Antes era un halo de 40px. */
  --shadow-glow:0 0 0 1px var(--primary),0 4px 12px rgba(0,0,0,.4);
  --shadow-lg:0 8px 24px rgba(0,0,0,.5),0 1px 2px rgba(0,0,0,.6);
}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',sans-serif;background:var(--bg);color:var(--text);min-height:100vh;min-height:100svh;line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden;padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom)}
a{color:var(--accent-2);text-decoration:none;transition:color .15s}
a:hover{color:var(--primary)}
::selection{background:var(--primary);color:var(--on-primary)}

/* Reading progress bar (top) */
.read-progress{position:fixed;top:0;left:0;right:0;height:3px;background:transparent;z-index:1000;pointer-events:none}
.read-progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--accent-2));width:0%;transition:width .1s;box-shadow:none}

/* ═══════════════════════════════════════════════════════════════
   HERO SECTIONS
   ═══════════════════════════════════════════════════════════════ */
.hero{position:relative;padding:60px 20px 40px;overflow:hidden;border-bottom:1px solid var(--border)}
.hero::before{content:'';position:absolute;top:-50%;right:-10%;width:600px;height:600px;background:radial-gradient(circle,var(--primary-glow) 0%,transparent 60%);pointer-events:none;animation:floatBg 20s ease-in-out infinite;will-change:transform}
.hero::after{content:'';position:absolute;bottom:-40%;left:-15%;width:500px;height:500px;background:radial-gradient(circle,rgba(108,99,255,.12) 0%,transparent 60%);pointer-events:none;animation:floatBg 25s ease-in-out infinite reverse;will-change:transform}
@keyframes floatBg{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(40px,-30px) scale(1.05)}}
/* Pausar animaciones costosas cuando la pestaña no está visible o el hero salió del viewport */
.hero-out .hero::before,.hero-out .hero::after{animation-play-state:paused}
html.page-hidden *,html.page-hidden *::before,html.page-hidden *::after{animation-play-state:paused!important}
/* Pausa global de animaciones en elementos fuera del viewport (toggleado por interactive.js).
   Crítico para hotspot-point (box-shadow infinite, no GPU), anim-sprint-loop, anim-wip-overload,
   anim-changing-reqs y demás animation:infinite que de otro modo seguirían pintando 24/7. */
.viewport-out,.viewport-out *,.viewport-out *::before,.viewport-out *::after{animation-play-state:paused!important}
@media (prefers-reduced-motion: reduce){
  .hero::before,.hero::after{animation:none}
}
.hero-inner{max-width:1100px;margin:0 auto;position:relative;z-index:1}
.hero h1{font-size:clamp(1.8rem,5vw,3.2rem);font-weight:900;letter-spacing:-.03em;line-height:1.1;margin-bottom:14px;background:linear-gradient(135deg,var(--text) 0%,var(--primary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero .tagline{font-size:clamp(.95rem,1.8vw,1.15rem);color:var(--text-d);max-width:650px;line-height:1.6}
.hero .badges{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.hero-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:100px;font-size:.78rem;font-weight:600;color:var(--text-d)}
.hero-badge strong{color:var(--primary)}

.breadcrumb{display:flex;align-items:center;gap:6px;font-size:.8rem;color:var(--text-d);margin-bottom:20px;flex-wrap:wrap}
.breadcrumb a{color:var(--text-d);font-weight:500;transition:color .15s}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb span.sep{opacity:.5}

.container{max-width:1100px;margin:0 auto;padding:40px 20px 80px}
.container-narrow{max-width:820px;margin:0 auto;padding:40px 20px 80px}

/* ═══════════════════════════════════════════════════════════════
   COURSE CARDS (Hub)
   ═══════════════════════════════════════════════════════════════ */
.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(320px,100%),1fr));gap:20px}
.course-card{background:linear-gradient(135deg,var(--bg-card) 0%,var(--bg-2) 100%);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden;display:block;text-decoration:none!important;color:var(--text)}
.course-card:hover{border-color:var(--primary);transform:translateY(-4px);box-shadow:none}
.course-card::before{content:'';position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary),var(--accent-2));opacity:0;transition:opacity .3s}
.course-card:hover::before{opacity:1}
.course-card .emoji{font-size:2.4rem;margin-bottom:14px;display:block;filter:drop-shadow(0 4px 8px rgba(0,0,0,.3))}
.course-card h3{font-size:1.15rem;font-weight:800;margin-bottom:8px;letter-spacing:-.01em;color:var(--text)}
.course-card p{font-size:.85rem;color:var(--text-d);line-height:1.55}
.course-card .meta{display:flex;gap:14px;margin-top:20px;padding-top:18px;border-top:1px solid var(--border);font-size:.72rem;color:var(--text-d);flex-wrap:wrap}
.course-card .meta span{display:inline-flex;align-items:center;gap:5px;font-weight:600}

/* ═══════════════════════════════════════════════════════════════
   LEARNING PATH (Course → Modules)
   ═══════════════════════════════════════════════════════════════ */
.path{position:relative;padding-left:50px}
.path::before{content:'';position:absolute;left:19px;top:20px;bottom:20px;width:2px;background:linear-gradient(180deg,var(--primary),var(--border) 100%)}
.path-item{position:relative;margin-bottom:18px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:22px 26px;transition:all .25s;display:block;text-decoration:none!important;color:var(--text)}
.path-item::before{content:'';position:absolute;left:-37px;top:24px;width:18px;height:18px;border-radius:50%;background:var(--bg);border:3px solid var(--border);transition:all .25s}
.path-item:hover{border-color:var(--primary);transform:translateX(4px);box-shadow:none}
.path-item:hover::before{background:var(--primary);border-color:var(--primary);box-shadow:0 0 0 4px var(--primary-glow)}
.path-item.completed::before{background:var(--primary);border-color:var(--primary);content:'✓';color:var(--on-primary);font-weight:900;font-size:.75rem;text-align:center;line-height:14px}
.path-item-head{display:flex;align-items:center;gap:14px;margin-bottom:8px}
.path-num{font-size:.7rem;font-weight:800;color:var(--primary);letter-spacing:.15em;text-transform:uppercase}
.path-item h3{font-size:1.05rem;font-weight:800;margin-bottom:6px;letter-spacing:-.01em}
.path-item p{font-size:.85rem;color:var(--text-d);line-height:1.55}
.path-item-meta{display:flex;gap:14px;margin-top:12px;font-size:.72rem;color:var(--text-dd);flex-wrap:wrap}
.path-item-meta span{display:inline-flex;align-items:center;gap:4px}

/* ═══════════════════════════════════════════════════════════════
   MODULE PAGE — Layout with sticky sidebar
   ═══════════════════════════════════════════════════════════════ */
.module-layout{display:grid;grid-template-columns:260px 1fr;gap:40px;max-width:1200px;margin:0 auto;padding:30px 20px 80px;align-items:start}
/* top deja espacio para la xp-bar / teacher-bar sticky (~50px). */
.sidebar{position:sticky;top:70px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;max-height:calc(100vh - 90px);overflow-y:auto}
.sidebar h4{font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.1em;color:var(--text-d);margin-bottom:14px}
.sidebar-nav{display:flex;flex-direction:column;gap:4px}
.sidebar-link{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:8px;font-size:.82rem;color:var(--text-d);cursor:pointer;transition:all .15s;text-decoration:none!important;border-left:3px solid transparent}
.sidebar-link:hover{background:var(--bg-hover);color:var(--text)}
.sidebar-link.active{background:var(--primary-glow);color:var(--primary);border-left-color:var(--primary);font-weight:700}
.sidebar-link.completed{color:var(--success)}
.sidebar-link.bonus{color:var(--accent)}
.sidebar-link.bonus::after{content:'BONUS';margin-left:auto;font-size:.55rem;font-weight:900;letter-spacing:.1em;padding:2px 6px;border-radius:4px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff}
.sidebar-link .num{width:24px;height:24px;border-radius:50%;background:var(--bg-2);color:var(--text);border:1.5px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:.72rem;font-weight:900;flex-shrink:0}
.sidebar-link.active .num{background:var(--primary);color:var(--on-primary);border-color:var(--primary)}
.sidebar-link.completed .num{background:var(--success);color:#fff;border-color:var(--success)}
.sidebar-link.bonus .num{background:var(--accent);color:#fff;border-color:var(--accent)}

/* Bonus clase — visual distinction (optional content) */
.clase.bonus{position:relative;padding:28px;background:linear-gradient(135deg,rgba(108,99,255,.06),rgba(56,189,248,.04));border:1px dashed var(--accent);border-radius:var(--radius-lg);margin-top:50px}
.clase.bonus::before{content:'✨ BONUS OPCIONAL';position:absolute;top:-12px;left:24px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;font-size:.68rem;font-weight:900;letter-spacing:.2em;padding:5px 12px;border-radius:20px}
.clase.bonus .clase-num{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff}
.clase.bonus .clase-label{color:var(--accent-2)}
.bonus-note{display:flex;align-items:flex-start;gap:14px;padding:16px 20px;background:rgba(108,99,255,.1);border:1px solid rgba(108,99,255,.3);border-radius:var(--radius);margin-bottom:24px;font-size:.88rem;color:var(--text-d)}
.bonus-note strong{color:var(--accent-2)}
.bonus-note .ico{font-size:1.4rem;flex-shrink:0}

/* ═══════════════════════════════════════════════════════════════
   SESSION TABS — Split module into multiple teaching sessions
   ═══════════════════════════════════════════════════════════════ */
.session-tabs{max-width:1200px;margin:24px auto 0;padding:0 20px;display:flex;gap:8px;flex-wrap:wrap}
.session-tab{flex:1;min-width:180px;padding:14px 18px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:all .18s;color:var(--text-d);text-align:left;font-family:inherit;font-size:.85rem;display:flex;flex-direction:column;gap:4px;position:relative;overflow:hidden}
.session-tab:hover{background:var(--bg-hover);color:var(--text);border-color:var(--border-light)}
.session-tab.active{background:linear-gradient(135deg,var(--primary-glow),rgba(108,99,255,.1));border-color:var(--primary);color:var(--text)}
.session-tab.active::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--accent-2))}
.session-tab .s-label{font-size:.68rem;font-weight:800;letter-spacing:.15em;text-transform:uppercase;color:var(--text-dd)}
.session-tab.active .s-label{color:var(--primary)}
.session-tab .s-title{font-size:.95rem;font-weight:800;color:inherit}
.session-tab .s-meta{font-size:.72rem;color:var(--text-dd);margin-top:2px}
.session-tab .s-icon{position:absolute;right:14px;top:50%;transform:translateY(-50%);font-size:1.4rem;opacity:.6}

/* Session divider banner (only visible in "all" view) */
.session-divider{margin:50px 0 30px;padding:22px 26px;background:linear-gradient(135deg,var(--primary-glow),rgba(108,99,255,.08));border:1px solid var(--primary);border-radius:var(--radius-lg);display:flex;align-items:center;gap:18px;position:relative;overflow:hidden}
.session-divider::before{content:'';position:absolute;inset:0;background:radial-gradient(circle at 90% 50%,rgba(152,202,63,.15),transparent 60%);pointer-events:none}
.session-divider .s-num{width:56px;height:56px;border-radius:14px;background:linear-gradient(135deg,var(--primary),var(--accent-2));color:#000;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:900;flex-shrink:0;z-index:1}
.session-divider-info{flex:1;z-index:1}
.session-divider .s-eyebrow{font-size:.68rem;font-weight:800;letter-spacing:.2em;color:var(--primary);margin-bottom:4px}
.session-divider h3{font-size:1.3rem;font-weight:900;letter-spacing:-.02em;margin-bottom:6px}
.session-divider p{font-size:.85rem;color:var(--text-d);line-height:1.5}
.session-divider .s-time{font-size:.75rem;color:var(--text-dd);margin-top:6px;display:flex;gap:14px;flex-wrap:wrap}

/* Recap card — shown at start of session 2 */
.recap-card{margin:30px 0;padding:24px 28px;background:var(--bg-card);border:1px solid var(--border);border-left:4px solid var(--accent-2);border-radius:var(--radius);position:relative}
.recap-card .r-label{font-size:.68rem;font-weight:800;letter-spacing:.2em;color:var(--accent-2);margin-bottom:6px}
.recap-card h3{font-size:1.15rem;font-weight:900;margin-bottom:14px}
.recap-card .r-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(240px,100%),1fr));gap:12px;margin-top:14px}
.recap-card .r-item{padding:12px 14px;background:var(--bg-2);border-radius:10px;font-size:.85rem;color:var(--text-d);display:flex;gap:10px;align-items:flex-start}
.recap-card .r-item .r-i-num{width:22px;height:22px;border-radius:50%;background:var(--accent-2);color:#000;font-weight:900;font-size:.7rem;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.recap-card .r-item strong{color:var(--text)}

/* Homework card — end of session 1 */
.homework-card{margin:30px 0;padding:24px 28px;background:linear-gradient(135deg,rgba(245,158,11,.08),rgba(152,202,63,.05));border:1px solid rgba(245,158,11,.4);border-radius:var(--radius);position:relative}
.homework-card .hw-label{font-size:.68rem;font-weight:800;letter-spacing:.2em;color:var(--warn);margin-bottom:6px;display:flex;align-items:center;gap:8px}
.homework-card h3{font-size:1.15rem;font-weight:900;margin-bottom:10px}
.homework-card p{font-size:.9rem;color:var(--text-d);line-height:1.6}
.homework-card ul{margin-top:12px;padding-left:20px}
.homework-card li{font-size:.88rem;color:var(--text-d);line-height:1.7;margin-bottom:4px}
.homework-card li strong{color:var(--text)}

/* Session label in sidebar */
.sidebar-session{font-size:.62rem;font-weight:800;letter-spacing:.15em;color:var(--text-dd);text-transform:uppercase;padding:12px 12px 6px;margin-top:8px;border-top:1px dashed var(--border)}
.sidebar-session:first-of-type{margin-top:0;border-top:none;padding-top:0}
.sidebar-link .s-tag{margin-left:auto;font-size:.55rem;font-weight:900;padding:2px 5px;border-radius:4px;background:var(--bg-2);color:var(--text-dd)}
.sidebar-link.active .s-tag{background:var(--primary);color:var(--on-primary)}

/* Hide clases not in active session */
body[data-session="1"] .clase[data-session="2"],
body[data-session="1"] .session-divider[data-session="2"],
body[data-session="1"] .recap-card,
body[data-session="2"] .clase[data-session="1"],
body[data-session="2"] .session-divider[data-session="1"],
body[data-session="2"] .homework-card{display:none}
body[data-session="1"] .sidebar-link[data-session="2"],
body[data-session="2"] .sidebar-link[data-session="1"]{display:none}
/* "all" view: hide recap (only useful when jumping to session 2) */
body[data-session="all"] .recap-card{display:none}
.sidebar-progress{margin:16px 0;padding:12px;background:var(--bg-2);border-radius:8px}
.sidebar-progress-label{display:flex;justify-content:space-between;font-size:.72rem;margin-bottom:6px;color:var(--text-d)}
.sidebar-progress-label strong{color:var(--primary)}
.sidebar-progress-bar{height:6px;background:var(--border);border-radius:4px;overflow:hidden}
.sidebar-progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--accent-2));border-radius:4px;transition:width .5s}

/* ═══════════════════════════════════════════════════════════════
   CLASE SECTIONS
   ═══════════════════════════════════════════════════════════════ */
.clase{margin-bottom:60px;scroll-margin-top:20px;opacity:0;transform:translateY(20px);animation:fadeUp .6s forwards}
.clase:nth-child(1){animation-delay:.1s}.clase:nth-child(2){animation-delay:.2s}.clase:nth-child(3){animation-delay:.3s}
@keyframes fadeUp{to{opacity:1;transform:translateY(0)}}

.clase-head{display:flex;align-items:center;gap:16px;margin-bottom:20px;padding-bottom:20px;border-bottom:1px solid var(--border)}
.clase-num{width:52px;height:52px;border-radius:14px;background:linear-gradient(135deg,var(--primary),var(--primary-d));color:#000;display:flex;align-items:center;justify-content:center;font-size:1.1rem;font-weight:900;flex-shrink:0}
.clase-head-info{flex:1;min-width:0}
.clase-label{font-size:.7rem;font-weight:800;color:var(--primary);letter-spacing:.15em;text-transform:uppercase;margin-bottom:4px}
.clase-head h2{font-size:clamp(1.3rem,2.5vw,1.8rem);font-weight:900;letter-spacing:-.02em;line-height:1.25}
.clase-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;font-size:.72rem;color:var(--text-d)}
.clase-meta span{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;background:var(--bg-2);border:1px solid var(--border);border-radius:999px;font-weight:600;letter-spacing:.01em}

.clase-intro{font-size:1rem;color:var(--text-d);line-height:1.7;margin-bottom:28px;padding:20px 24px;background:var(--bg-card);border-left:3px solid var(--primary);border-radius:0 var(--radius) var(--radius) 0}
.clase-intro strong{color:var(--text)}

.clase-content{display:flex;flex-direction:column;gap:20px}

/* ═══════════════════════════════════════════════════════════════
   CONTENT BLOCKS (Cards, callouts, examples)
   ═══════════════════════════════════════════════════════════════ */
.block{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:22px 26px;transition:all .2s}
.block:hover{border-color:var(--border-light)}
.block h3{font-size:1.08rem;font-weight:800;margin-bottom:10px;display:flex;align-items:center;gap:8px;letter-spacing:-.01em}
.block h3 .block-icon{font-size:1.2rem}
.block p{color:var(--text-d);font-size:.92rem;line-height:1.7}
.block p+p{margin-top:10px}
.block ul,.block ol{margin:10px 0 0 20px;color:var(--text-d)}
.block li{margin-bottom:6px;line-height:1.65}
.block li strong{color:var(--text)}

/* Callouts (info, warn, success, danger) */
.callout{border-radius:var(--radius);padding:18px 22px 18px 60px;position:relative;margin:8px 0}
.callout::before{content:'';position:absolute;left:20px;top:18px;font-size:1.4rem;line-height:1}
.callout strong{color:var(--text)}
.callout.info{background:rgba(56,189,248,.08);border-left:3px solid var(--accent-2);color:var(--text-d)}
.callout.info::before{content:'💡'}
.callout.warn{background:rgba(245,158,11,.08);border-left:3px solid var(--warn);color:var(--text-d)}
.callout.warn::before{content:'⚠️'}
.callout.success{background:rgba(34,197,94,.08);border-left:3px solid var(--success);color:var(--text-d)}
.callout.success::before{content:'✅'}
.callout.key{background:linear-gradient(135deg,rgba(152,202,63,.1),rgba(108,99,255,.05));border-left:3px solid var(--primary);color:var(--text-d)}
.callout.key::before{content:'🎯'}
.callout.quote{background:var(--bg-2);border-left:3px solid var(--text-d);font-style:italic;color:var(--text)}
.callout.quote::before{content:'❝';font-size:2rem;color:var(--text-dd)}

/* Flip cards */
.flip-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(260px,100%),1fr));gap:14px}
.flip-card{perspective:1000px;height:240px;cursor:pointer}
.flip-inner{position:relative;width:100%;height:100%;transition:transform .6s;transform-style:preserve-3d}
.flip-card.flipped .flip-inner{transform:rotateY(180deg)}
.flip-front,.flip-back{position:absolute;inset:0;backface-visibility:hidden;border-radius:var(--radius);padding:18px;display:flex;flex-direction:column;justify-content:center;border:1px solid var(--border);overflow:hidden}
.flip-front{background:linear-gradient(135deg,var(--bg-card),var(--bg-2))}
.flip-back{background:linear-gradient(135deg,var(--primary-glow),var(--bg-card));transform:rotateY(180deg);border-color:var(--primary);justify-content:flex-start;overflow-y:auto}
.flip-front .flip-q{font-size:.95rem;font-weight:700;color:var(--text);margin-bottom:8px}
.flip-front .flip-hint{font-size:.72rem;color:var(--primary);margin-top:auto;display:flex;align-items:center;gap:4px;font-weight:600}
/* Indicador "↻ tap" centrado en el front: cubre el aire muerto entre el
   título y el hint en cards con texto corto. Solo visible si el front
   tiene un single .flip-q + .flip-hint (no rompe variantes con más
   contenido). */
.flip-front:has(>.flip-q+.flip-hint:last-child)::after{
  content:'↻ tocar';
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  font-size:.72rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;
  color:var(--text-d);opacity:.55;pointer-events:none;
}
.flip-back p{font-size:.8rem;color:var(--text);line-height:1.5;margin:0}
.flip-back p+p{margin-top:6px}
/* Cuando flip-front tiene fondo oscuro inline (style="background:linear-gradient..."), forzar texto claro y alto contraste */
.flip-front[style*="background"] .flip-q,
.flip-front[style*="gradient"] .flip-q{color:#fff;text-shadow:0 1px 2px rgba(0,0,0,.45)}
.flip-front[style*="background"] .flip-hint,
.flip-front[style*="gradient"] .flip-hint{color:rgba(255,255,255,.92);text-shadow:0 1px 2px rgba(0,0,0,.4)}
.flip-front[style*="background"],
.flip-front[style*="gradient"]{border-color:rgba(255,255,255,.18)}

/* Comparison (vs) */
.vs-grid{display:grid;grid-template-columns:1fr auto 1fr;gap:16px;align-items:stretch;margin:10px 0}
.vs-side{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px 22px}
.vs-side h4{font-size:1rem;font-weight:800;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.vs-side.left h4{color:var(--accent-2)}
.vs-side.right h4{color:var(--primary)}
.vs-side ul{margin:0;padding-left:18px;color:var(--text-d);font-size:.88rem}
.vs-side li{margin-bottom:6px;line-height:1.55}
.vs-divider{display:flex;align-items:center;justify-content:center;width:44px;font-weight:900;color:var(--text-d);font-size:.8rem;background:var(--bg-2);border-radius:50%;align-self:center;height:44px;border:2px solid var(--border);justify-self:center}
@media(max-width:640px){
  .vs-grid{grid-template-columns:1fr}
  .vs-divider{width:100%;height:32px;border-radius:8px;margin:4px 0}
}

/* Timeline */
.timeline{position:relative;padding-left:32px}
.timeline::before{content:'';position:absolute;left:10px;top:6px;bottom:6px;width:2px;background:var(--border)}
.timeline-item{position:relative;margin-bottom:18px;padding-left:12px}
.timeline-item::before{content:'';position:absolute;left:-28px;top:6px;width:14px;height:14px;border-radius:50%;background:var(--primary);border:3px solid var(--bg);box-shadow:0 0 0 2px var(--primary)}
.timeline-item .t-year{font-size:.72rem;font-weight:800;color:var(--primary);letter-spacing:.1em}
.timeline-item h4{font-size:.95rem;font-weight:700;margin:2px 0 4px}
.timeline-item p{font-size:.85rem;color:var(--text-d);line-height:1.55}

/* Reveal cards (accordion) */
.reveal{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:all .2s;color:var(--text)}
.reveal-head{padding:16px 20px;cursor:pointer;display:flex;align-items:center;gap:12px;user-select:none;transition:background .15s;color:var(--text)}
.reveal-head:hover{background:var(--bg-hover)}
.reveal-head h4{flex:1;font-size:.95rem;font-weight:700;margin:0;color:var(--text)}
.reveal-head .r-icon{font-size:1.1rem;flex-shrink:0}
.reveal-head .r-arrow{color:var(--text-d);transition:transform .25s;flex-shrink:0;font-size:1.2rem}
.reveal.open .r-arrow{transform:rotate(180deg);color:var(--primary)}
.reveal-body{max-height:0;overflow:hidden;transition:max-height .3s ease-out}
.reveal.open .reveal-body{max-height:800px;border-top:1px solid var(--border)}
.reveal-body-inner{padding:18px 20px;color:var(--text-d);font-size:.88rem;line-height:1.65}

/* Reveal grid (lista de <details class="reveal">) */
.reveal-grid{display:flex;flex-direction:column;gap:10px;margin:10px 0}
.reveal-grid details.reveal{padding:0}
.reveal-grid details.reveal > summary{list-style:none;padding:14px 18px;cursor:pointer;display:flex;align-items:flex-start;gap:10px;font-size:.92rem;line-height:1.5;color:var(--text);user-select:none;transition:background .15s}
.reveal-grid details.reveal > summary::-webkit-details-marker{display:none}
.reveal-grid details.reveal > summary::before{content:'▸';color:var(--text-d);transition:transform .2s;flex-shrink:0;display:inline-block;font-size:.8rem;margin-top:3px}
.reveal-grid details.reveal[open] > summary::before{transform:rotate(90deg);color:var(--primary)}
.reveal-grid details.reveal > summary:hover{background:var(--bg-hover)}
.reveal-grid details.reveal[open] > summary{border-bottom:1px solid var(--border);background:var(--bg-hover)}
.reveal-grid details.reveal > p,
.reveal-grid details.reveal > div{margin:0;padding:14px 18px 16px;color:var(--text-d);font-size:.86rem;line-height:1.65}

/* Chips / tags */
.chip{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:100px;font-size:.68rem;font-weight:700;background:var(--bg-2);color:var(--text-d);border:1px solid var(--border)}
.chip.primary{background:var(--primary-glow);color:var(--primary);border-color:var(--primary)}
.chip.accent{background:rgba(108,99,255,.12);color:var(--accent);border-color:var(--accent)}
.chip.locked{background:rgba(245,158,11,.1);color:var(--warn);border-color:rgba(245,158,11,.35)}
.chip.partial{background:rgba(99,102,241,.15);color:#a5b4fc;border-color:rgba(165,180,252,.45)}

/* Módulo bloqueado por política de avance */
.path-item.locked{opacity:.55;cursor:not-allowed;pointer-events:auto}
.path-item.locked:hover{transform:none;border-color:var(--border);box-shadow:none}
.path-item.locked:hover::before{background:var(--bg);border-color:var(--border);box-shadow:none}
.path-item.locked::after{content:'🔒';position:absolute;top:18px;right:18px;font-size:1.2rem;opacity:.7}
.path-item-lock-reason{margin-top:10px;padding:8px 12px;background:rgba(245,158,11,.08);border:1px dashed rgba(245,158,11,.3);border-radius:8px;font-size:.75rem;color:var(--warn);font-weight:600;display:flex;align-items:center;gap:6px}

/* ─── Anti-flash mientras se evalúa el gate de política ──────── */
/* En el hub: ocultar path-items hasta saber si están bloqueados */
.path-item.gate-checking{opacity:0;pointer-events:none;transition:opacity .15s}
.path-item:not(.gate-checking){opacity:1}
/* En página de módulo: ocultar todo el main hasta resolver el gate */
body.learn-gate-checking main,
body.learn-gate-checking .module-layout,
body.learn-gate-checking .hero,
body.learn-gate-checking .session-tabs,
body.learn-gate-checking footer{visibility:hidden}
#learn-gate-loader{position:fixed;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;background:var(--bg,#0a0d14);z-index:99999;color:var(--text-d,#9699a6);font-size:.85rem;font-weight:600}
.learn-gate-spin{width:32px;height:32px;border:3px solid rgba(165,180,252,.25);border-top-color:#a5b4fc;border-radius:50%;animation:learnGateSpin .8s linear infinite}
@keyframes learnGateSpin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion: reduce){.learn-gate-spin{animation:none}}

/* ═══════════════════════════════════════════════════════════════
   QUIZ
   ═══════════════════════════════════════════════════════════════ */
.quiz-card{background:linear-gradient(135deg,var(--bg-card),var(--bg-2));border:2px solid var(--border);border-radius:var(--radius-lg);padding:28px;margin:24px 0;position:relative;overflow:hidden}
.quiz-card::before{content:'';position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary),var(--accent-2))}
.quiz-card h3{font-size:1.05rem;font-weight:800;margin-bottom:6px;display:flex;align-items:center;gap:8px}
.quiz-card>p.qd{font-size:.82rem;color:var(--text-d);margin-bottom:20px}
.quiz-q{margin-bottom:22px}
.quiz-q>p{font-size:.95rem;font-weight:700;margin-bottom:12px;color:var(--text)}
.quiz-q .qnum{display:inline-block;width:24px;height:24px;border-radius:50%;background:var(--primary-glow);color:var(--primary);text-align:center;line-height:24px;font-size:.75rem;font-weight:800;margin-right:8px}
.quiz-opt{display:flex;flex-direction:column;gap:8px}
.quiz-opt label{display:flex;align-items:flex-start;gap:12px;padding:12px 16px;border:1.5px solid var(--border);border-radius:10px;font-size:.88rem;cursor:pointer;transition:all .15s;line-height:1.5}
.quiz-opt label:hover{background:var(--bg-hover);border-color:var(--border-light);transform:translateX(2px)}
.quiz-opt input{accent-color:var(--primary);width:18px;height:18px;margin-top:2px;flex-shrink:0}
.quiz-opt label.correct{background:rgba(34,197,94,.12);border-color:var(--success);color:var(--success)}
.quiz-opt label.correct::after{content:'✓';margin-left:auto;font-weight:900;font-size:1.1rem}
.quiz-opt label.wrong{background:rgba(239,68,68,.08);border-color:var(--danger);color:var(--danger);opacity:.7}
.quiz-opt label.wrong::after{content:'✕';margin-left:auto;font-weight:900;font-size:1.1rem}
.quiz-btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;background:linear-gradient(135deg,var(--primary),var(--primary-d));color:#000;border:none;border-radius:10px;font-size:.9rem;font-weight:800;cursor:pointer;transition:all .15s;letter-spacing:.01em}
.quiz-btn:hover{filter:brightness(1.08);transform:translateY(-1px)}
.quiz-btn:disabled{opacity:.4;cursor:default;transform:none}
.quiz-btn.secondary{background:var(--bg-elevated);color:var(--text)}
.quiz-result{margin-top:18px;padding:18px 22px;border-radius:10px;font-size:.92rem;font-weight:700;display:flex;align-items:center;gap:10px}
.quiz-result.pass{background:rgba(34,197,94,.12);color:var(--success);border:1px solid rgba(34,197,94,.3)}
.quiz-result.fail{background:rgba(245,158,11,.1);color:var(--warn);border:1px solid rgba(245,158,11,.3)}
.quiz-result .big{font-size:1.5rem}

/* ═══════════════════════════════════════════════════════════════
   KEY TAKEAWAYS / CONCLUSIONES
   ═══════════════════════════════════════════════════════════════ */
.takeaways{background:linear-gradient(135deg,rgba(152,202,63,.08),rgba(108,99,255,.05));border:1px solid var(--border);border-radius:var(--radius-lg);padding:30px 32px;margin:32px 0}
.takeaways h3{font-size:1.15rem;font-weight:900;margin-bottom:16px;display:flex;align-items:center;gap:10px}
.takeaway-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(260px,100%),1fr));gap:14px;margin-top:18px}
.takeaway{display:flex;gap:12px;padding:14px 16px;background:var(--bg-card);border-radius:10px;border:1px solid var(--border)}
.takeaway .t-num{width:28px;height:28px;border-radius:50%;background:var(--primary);color:var(--on-primary);display:flex;align-items:center;justify-content:center;font-size:.82rem;font-weight:900;flex-shrink:0}
.takeaway p{font-size:.85rem;color:var(--text);line-height:1.55;margin:0}
/* Variante .ta-item — usada en mods 2/3/9/10. Mismo look que .takeaway pero
   con <span> en vez de .t-num. Se renderiza en columna única apilada. */
.takeaways .ta-item{display:flex;gap:14px;align-items:flex-start;padding:14px 16px;background:var(--bg-card);border-radius:10px;border:1px solid var(--border);margin-top:12px}
.takeaways .ta-item:first-of-type{margin-top:18px}
.takeaways .ta-item > span{flex:0 0 auto;width:30px;height:30px;border-radius:50%;background:var(--primary);color:var(--on-primary);display:inline-flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:900;line-height:1}
.takeaways .ta-item p{font-size:.92rem;color:var(--text);line-height:1.6;margin:0;flex:1;min-width:0}
html[data-theme="udemy"] .takeaways .ta-item > span{color:#fff}

/* ═══════════════════════════════════════════════════════════════
   FINAL CTA — Module complete
   ═══════════════════════════════════════════════════════════════ */
.cta-final{text-align:center;padding:50px 30px;background:linear-gradient(135deg,var(--bg-card),var(--bg-2));border:1px solid var(--border);border-radius:var(--radius-lg);margin-top:40px;position:relative;overflow:hidden}
.cta-final::before{content:'';position:absolute;top:-50%;left:50%;transform:translateX(-50%);width:400px;height:400px;background:radial-gradient(circle,var(--primary-glow) 0%,transparent 60%);pointer-events:none}
.cta-final h2{font-size:1.6rem;font-weight:900;margin-bottom:10px;position:relative;letter-spacing:-.02em}
.cta-final p{color:var(--text-d);font-size:.95rem;margin-bottom:24px;position:relative}
.cta-final .btn-group{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;position:relative}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 22px;border-radius:10px;font-size:.88rem;font-weight:700;cursor:pointer;transition:all .15s;border:1px solid transparent;text-decoration:none!important}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-d));color:#000}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-1px)}
.btn-outline{background:transparent;border-color:var(--border);color:var(--text)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}

/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════════ */
@media(max-width:900px){
  .module-layout{grid-template-columns:1fr;gap:20px;padding:20px 16px 60px}
  .sidebar{position:static;max-height:none;order:-1}
  .sidebar-nav{
    flex-direction:row;overflow-x:auto;gap:6px;padding-bottom:6px;
    /* Fade derecho indica que hay más clases scrolleando: evita la
       impresión de que el último link visible está cortado a medias. */
    -webkit-mask-image:linear-gradient(90deg,#000 0,#000 calc(100% - 24px),transparent 100%);
            mask-image:linear-gradient(90deg,#000 0,#000 calc(100% - 24px),transparent 100%);
    scroll-snap-type:x proximity;
    scrollbar-width:none;
  }
  .sidebar-nav::-webkit-scrollbar{display:none}
  .sidebar-link{flex-shrink:0;white-space:nowrap;padding:8px 12px;scroll-snap-align:start}
  .sidebar-progress{display:none}
  .sidebar h4{display:none}
  /* Evita overflow horizontal: todo hijo directo del main respeta el
     ancho del viewport. Cards con padding grande no se salen. */
  .module-layout > main{min-width:0}
  .module-layout > main > *{max-width:100%;min-width:0}
}
@media(max-width:600px){
  .hero{padding:40px 16px 30px}
  .hero h1{font-size:clamp(1.6rem,7vw,2rem)}
  .hero::before,.hero::after{animation:none;opacity:.3}
  .container,.container-narrow{padding:24px 16px 60px}
  .clase-head{gap:12px}
  .clase-num{width:44px;height:44px;font-size:.95rem}
  .block,.quiz-card,.takeaways,.cta-final{padding:18px 20px;min-width:0}
  .path{padding-left:28px}
  .path::before{left:9px}
  .path-item{padding:18px 16px;min-width:0}
  .path-item::before{left:-23px;width:14px;height:14px}
  /* Topbars del Hub e índice de curso: padding lateral reducido para
     no comer espacio del logo+brand y permitir que el avatar/luna se vean
     completos en viewports chicos (≤360px). */
  .topbar, .lh-topbar{padding-left:14px!important;padding-right:14px!important;gap:8px}
  .topbar .brand, .lh-topbar .brand{font-size:.92rem;min-width:0;flex:0 1 auto}
  /* Read-progress discreta */
  .read-progress{height:2px}
  /* User widget (avatar flotante): más pequeño y pegado a la esquina
     con safe-area para no chocar con la xp-bar ni el notch. */
  #userWidget{top:max(5px,env(safe-area-inset-top))!important;right:8px!important}
  /* Staff: el avatar va DENTRO de la teacher-bar (slot reservado por
     padding-right:72px), no debajo. Misma altura que la barra. */
  body.is-staff:not(.pm-active) #userWidget{top:max(6px,env(safe-area-inset-top,0px))!important;right:10px!important}
  #userWidget .la-avatar{width:32px;height:32px}
  /* Theme toggle: alineado al MISMO Y que el avatar para verse como unidad,
     no como dos botones flotantes a alturas distintas. */
  .learn-theme-toggle{top:max(8px,env(safe-area-inset-top))!important;right:54px!important;width:32px;height:32px}
  body.is-staff:not(.pm-active) .learn-theme-toggle{top:max(8px,env(safe-area-inset-top,0px))!important;right:54px!important}
  .learn-theme-toggle .lth-ico svg{width:16px;height:16px}
  /* Hero: padding-top mayor para que el avatar+toggle no superpongan el
     breadcrumb. En staff baja aún más por la teacher-bar fija. */
  .hero{padding-top:54px}
  body.is-staff .hero{padding-top:104px}
  /* Teacher bar: fijada al top en móvil para que SIEMPRE esté visible y
     no compita con el dock+fab en posición natural al final del hero.
     Compensar body con padding-top adicional. */
  body.is-staff:not(.pm-active) .tb-bar{position:fixed;top:0;left:0;right:0}
  body.is-staff:not(.pm-active){padding-top:env(safe-area-inset-top)}
  /* Avatar y theme toggle quedan FIJOS al hacer scroll para que el usuario
     siempre tenga acceso al menú de cuenta y al toggle de tema. La sombra
     y backdrop ligeros evitan que choquen visualmente con cards detrás. */
  #userWidget{position:fixed!important}
  #userWidget .la-avatar{box-shadow:none}
  .learn-theme-toggle{position:fixed!important;background:var(--bg-card);backdrop-filter:saturate(140%) blur(8px);-webkit-backdrop-filter:saturate(140%) blur(8px)}
  /* Session-tabs compactas */
  .session-tabs{padding:0 16px;gap:6px;margin-top:16px}
  .session-tab{padding:10px 12px;font-size:.78rem;min-width:0}
  .session-tab .s-icon{display:none}
  /* Divider y cards largos — sin padding excesivo */
  .session-divider{padding:16px 18px;gap:12px}
  .session-divider .s-num{width:44px;height:44px;font-size:1.2rem}
  .session-divider h3{font-size:1.1rem}
  .recap-card,.homework-card{padding:18px 20px}
  /* VS / flip / takeaway grids colapsan a 1 col con min-width:0 para
     que su contenido pueda reducirse sin forzar overflow. */
  .flip-grid,.takeaway-list{grid-template-columns:1fr}
  .takeaway{min-width:0}
  /* Hotspot/mock visor — que no se salga */
  .mock-explorer{max-width:100%;overflow-x:auto;white-space:pre-wrap;word-break:break-word}
}

/* ═══════════════════════════════════════════════════════════════
   THEME: UDEMY (light)
   Se activa con <html data-theme="udemy">.
   Sobrescribe los tokens de color pero mantiene geometría/spacing.
   ═══════════════════════════════════════════════════════════════ */
html[data-theme="udemy"]{
  --bg:#ffffff;
  --bg-2:#f7f9fa;
  --bg-card:#ffffff;
  --bg-hover:#f4f5f7;
  --bg-elevated:#f7f9fa;
  --border:#d1d7dc;
  --border-light:#b4babf;
  --text:#1c1d1f;
  --text-d:#6a6f73;
  --text-dd:#898f94;
  --primary:#a435f0;
  --primary-d:#8710d8;
  --primary-glow:rgba(164,53,240,.10);
  --on-primary:#ffffff; /* sobre violeta Udemy, blanco lee mejor que negro. */
  --accent:#5624d0;
  --accent-2:#5624d0;
  --warn:#b98407;
  --danger:#c4221f;
  --success:#197a3d;
  --shadow-sm:0 1px 3px rgba(40,44,63,.06),0 1px 2px rgba(40,44,63,.04);
  --shadow:0 4px 10px rgba(40,44,63,.08),0 2px 4px rgba(40,44,63,.05);
  --shadow-lg:0 12px 28px rgba(40,44,63,.12),0 4px 10px rgba(40,44,63,.06);
  --shadow-glow:0 0 0 3px rgba(164,53,240,.15);
}
html[data-theme="udemy"] body{background:var(--bg);color:var(--text)}
html[data-theme="udemy"] ::selection{background:var(--primary);color:#fff}
html[data-theme="udemy"] a{color:var(--primary)}
html[data-theme="udemy"] a:hover{color:var(--primary-d)}

/* Hero fondos suaves en light */
html[data-theme="udemy"] .hero{background:#ffffff;border-bottom:1px solid var(--border)}
html[data-theme="udemy"] .hero::before,html[data-theme="udemy"] .hero::after{display:none}
html[data-theme="udemy"] .hero h1{
  background:none;-webkit-text-fill-color:initial;color:var(--text);
  font-weight:800;
}

/* Cards planos tipo Udemy */
html[data-theme="udemy"] .course-card{background:#ffffff;border-radius:4px;box-shadow:none;padding:18px}
html[data-theme="udemy"] .course-card:hover{transform:none;box-shadow:none;border-color:var(--text)}
html[data-theme="udemy"] .course-card::before{display:none}
html[data-theme="udemy"] .course-card .emoji{filter:none}
html[data-theme="udemy"] .course-card h3{font-weight:700}

/* Path (módulos) */
html[data-theme="udemy"] .path-item{background:#ffffff;border-radius:4px;box-shadow:none}
html[data-theme="udemy"] .path-item:hover{transform:none;box-shadow:none;border-color:var(--text)}
html[data-theme="udemy"] .path-item::before{background:#ffffff}
html[data-theme="udemy"] .path::before{background:var(--border)}
html[data-theme="udemy"] .path-item.completed::before{color:#fff;background:var(--success);border-color:var(--success)}

html[data-theme="udemy"] .hero-badge{background:#ffffff;border-radius:4px}

/* Scrollbar claro */
html[data-theme="udemy"] *::-webkit-scrollbar-thumb{background:#d1d7dc}
html[data-theme="udemy"] *::-webkit-scrollbar-thumb:hover{background:#b4babf}

/* Read progress discreto */
html[data-theme="udemy"] .read-progress-fill{background:var(--primary);box-shadow:none}

/* ═══════════════════════════════════════════════════════════════
   THEME TOGGLE — botón flotante (todas las páginas)
   ═══════════════════════════════════════════════════════════════ */
.learn-theme-toggle{
  position:fixed;top:7px;right:68px;z-index:10000;
  width:36px;height:36px;border-radius:50%;
  background:var(--bg-card);border:1px solid var(--border);
  color:var(--text);cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  font-size:1rem;line-height:1;padding:0;
  box-shadow:none;
  transition:transform .15s ease,border-color .15s ease,box-shadow .15s ease,background .15s ease;
}
.learn-theme-toggle:hover{transform:scale(1.08) rotate(-6deg);border-color:var(--primary);box-shadow:none}
.learn-theme-toggle:active{transform:scale(.95)}
.learn-theme-toggle:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.learn-theme-toggle .lth-ico{display:inline-flex;align-items:center;justify-content:center;transition:transform .3s cubic-bezier(.16,1,.3,1)}
.learn-theme-toggle .lth-ico svg{display:block;width:18px;height:18px}
.learn-theme-toggle:hover .lth-ico{transform:rotate(20deg) scale(1.12)}
/* En tema oscuro la luna tiene un tono más cálido; en claro el sol queda en el primary del tema. */
html[data-theme="platzi"] .learn-theme-toggle{color:#fde68a}
html[data-theme="udemy"]  .learn-theme-toggle{color:#a435f0}
body.pm-active .learn-theme-toggle,body.wb-active .learn-theme-toggle{display:none!important}
html[data-theme="udemy"] .learn-theme-toggle{box-shadow:none}
/* Cuando el usuario está logueado, el switch de tema vive dentro del
   menú del avatar. Ocultamos el botón flotante para no duplicar la
   acción y liberar la esquina superior derecha. */
body:has(#userWidget .la-user) .learn-theme-toggle{display:none !important}
html[data-theme="udemy"] .learn-theme-toggle:hover{transform:scale(1.08) rotate(-6deg);box-shadow:none}
@media (max-width:820px){
  .learn-theme-toggle{top:max(8px,env(safe-area-inset-top));right:58px;width:32px;height:32px;font-size:.9rem}
}

/* ═══════════════════════════════════════════════════════════════
   THEME: UDEMY — componentes específicos de módulo/clase
   Flat, sin gradients ni glows. Mantiene jerarquía visual.
   ═══════════════════════════════════════════════════════════════ */

/* Session tabs (SESIÓN 1 / 2 / VISTA COMPLETA) */
html[data-theme="udemy"] .session-tab{background:#ffffff;border-radius:4px;box-shadow:none}
html[data-theme="udemy"] .session-tab:hover{background:#f7f9fa}
html[data-theme="udemy"] .session-tab.active{background:var(--primary-glow);border-color:var(--primary);box-shadow:none;color:var(--text)}
html[data-theme="udemy"] .session-tab.active::before{background:var(--primary)}
html[data-theme="udemy"] .session-tab.active .s-label{color:var(--primary-d)}
html[data-theme="udemy"] .session-tab .s-label{letter-spacing:.08em;color:var(--text-d)}

/* Session divider (Sesión 1 de 2 / Entender el mundo) */
html[data-theme="udemy"] .session-divider{
  background:var(--primary-glow);
  border:1px solid rgba(164,53,240,.25);
  border-radius:4px;
}
html[data-theme="udemy"] .session-divider::before{display:none}
html[data-theme="udemy"] .session-divider .s-num{
  background:var(--primary);color:#ffffff;
  box-shadow:none;border-radius:4px;
}
html[data-theme="udemy"] .session-divider .s-eyebrow{color:var(--primary-d);letter-spacing:.08em}
html[data-theme="udemy"] .session-divider h3{font-weight:800;letter-spacing:-.01em}

/* Clase number (círculo morado con "1") */
html[data-theme="udemy"] .clase-num{
  background:var(--primary);color:#ffffff;
  border-radius:4px;box-shadow:none;
}
html[data-theme="udemy"] .clase.bonus .clase-num{background:var(--accent);box-shadow:none}

/* Blocks (generic content cards) */
html[data-theme="udemy"] .block{background:#ffffff;border-radius:4px;box-shadow:none}
html[data-theme="udemy"] .block:hover{border-color:var(--text-d)}

/* Recap card */
html[data-theme="udemy"] .recap-card{background:#ffffff;border-radius:4px;border-left:4px solid var(--accent)}
html[data-theme="udemy"] .recap-card .r-label{color:var(--accent);letter-spacing:.08em}
html[data-theme="udemy"] .recap-card .r-item{background:#f7f9fa;border-radius:4px}
html[data-theme="udemy"] .recap-card .r-item .r-i-num{background:var(--accent);color:#ffffff}

/* Homework card */
html[data-theme="udemy"] .homework-card{
  background:#ffffff;border-radius:4px;
  border:1px solid rgba(185,132,7,.4);border-left:4px solid var(--warn);
}
html[data-theme="udemy"] .homework-card .hw-label{color:var(--warn);letter-spacing:.08em}

/* Takeaways: ya no gradient verde-morado */
html[data-theme="udemy"] .takeaways{
  background:#ffffff;border:1px solid var(--border);border-radius:4px;
}

/* Contraste WCAG AA: en theme oscuro --accent-2 es #38bdf8 (azul claro) y
   color:#000 funciona; en theme udemy --accent-2 es #5624d0 (violeta oscuro)
   y #000 da apenas 4.6:1. Forzar blanco da 7.5:1 (AAA). */
html[data-theme="udemy"] .int-check-btn.primary,
html[data-theme="udemy"] .recap-card .r-item .r-i-num,
html[data-theme="udemy"] .pm-help-close{color:#fff}

/* Objetivo del módulo (la card verdosa arriba) */
html[data-theme="udemy"] .objetivo,
html[data-theme="udemy"] .block.objetivo,
html[data-theme="udemy"] .module-goal{
  background:var(--primary-glow);
  border:1px solid rgba(164,53,240,.22);
  border-radius:4px;
}

/* Quiz card */
html[data-theme="udemy"] .quiz-card{background:#ffffff;border-radius:4px}
html[data-theme="udemy"] .quiz-card::before{background:var(--primary)}

/* CTA final */
html[data-theme="udemy"] .cta-final{background:#ffffff;border-radius:4px;box-shadow:none}
html[data-theme="udemy"] .cta-final::before{display:none}

/* Clase head */
html[data-theme="udemy"] .clase-head{border-bottom-color:var(--border)}

/* Path eyebrows / session headings */
html[data-theme="udemy"] .path-num{color:var(--primary-d);letter-spacing:.08em}

/* Bonus pill (badge inline). NO debe afectar a .clase.bonus (sección completa). */
html[data-theme="udemy"] .bonus-pill,
html[data-theme="udemy"] span.bonus,
html[data-theme="udemy"] .bonus:not(.clase):not(section){background:var(--accent);color:#ffffff;border-radius:4px;box-shadow:none}

/* Xp-bar (barra "Vista docente / En vivo / Matriculados") */
html[data-theme="udemy"] .xp-bar{
  background:#ffffff;border-bottom:1px solid var(--border);
  backdrop-filter:none;-webkit-backdrop-filter:none;
}

/* Teacher bar (la barra superior verde de docente) */
html[data-theme="udemy"] .tb-bar{
  background:#ffffff;
  border-bottom:1px solid var(--border);
}
html[data-theme="udemy"] .tb-label{background:rgba(86,36,208,.08);color:var(--accent)}
html[data-theme="udemy"] .tb-label::before{background:var(--accent);box-shadow:none}
html[data-theme="udemy"] .tb-stat{background:#f7f9fa;border:1px solid var(--border);color:var(--text)}
html[data-theme="udemy"] .tb-panel{background:#ffffff;border-left:1px solid var(--border)}
html[data-theme="udemy"] .tb-panel-close{border-color:var(--border);color:var(--text-d)}
html[data-theme="udemy"] .tb-student{background:#ffffff;border:1px solid var(--border)}
html[data-theme="udemy"] .tb-student.online{background:rgba(164,53,240,.06);border-color:rgba(164,53,240,.28)}
html[data-theme="udemy"] .tb-student-av{background:#f7f9fa;color:var(--text)}
html[data-theme="udemy"] .tb-student.online .tb-student-dot{background:var(--primary);box-shadow:0 0 6px rgba(164,53,240,.5)}
html[data-theme="udemy"] .tb-badge-card{background:#ffffff;border:1px solid var(--border)}

/* Dock (barra inferior derecha con pizarra/presentación) */
html[data-theme="udemy"] .lh-dock{
  background:rgba(255,255,255,.92);
  border:1px solid var(--border);
  box-shadow:none;
  backdrop-filter:blur(10px);
}
html[data-theme="udemy"] .lh-dock > button,
html[data-theme="udemy"] .lh-dock > .wb-toggle{color:var(--text)}
html[data-theme="udemy"] .lh-dock-sep{background:var(--border)}

/* Feedback FAB en light */
html[data-theme="udemy"] .lfb-fab{
  background:var(--primary);color:#ffffff;
  box-shadow:none;
  border-radius:100px;
}
html[data-theme="udemy"] .lfb-fab:hover{background:var(--primary-d);transform:none}

/* Quiz button en Udemy: texto blanco sobre morado (no gradient, no glow) */
html[data-theme="udemy"] .quiz-btn{
  background:var(--primary);color:#ffffff;
  border-radius:4px;border:1px solid var(--primary);
  letter-spacing:.02em;
}
html[data-theme="udemy"] .quiz-btn:hover{
  background:var(--primary-d);border-color:var(--primary-d);
  filter:none;transform:none;box-shadow:none;
}
html[data-theme="udemy"] .quiz-btn.secondary{
  background:#ffffff;color:var(--text);border-color:var(--border);
}
html[data-theme="udemy"] .quiz-btn.secondary:hover{
  background:var(--primary-glow);border-color:var(--primary);color:var(--primary-d);
}

/* ═══════════════════════════════════════════════════════════════
   THEME: UDEMY — fix contrastes de texto sobre morado
   (heredados de Platzi que usaba color:#000 sobre verde lima)
   ═══════════════════════════════════════════════════════════════ */

/* Botones con fondo primario: texto BLANCO en Udemy */
html[data-theme="udemy"] .btn-primary{
  background:var(--primary);color:#ffffff;
  border-radius:4px;border:1px solid var(--primary);
}
html[data-theme="udemy"] .btn-primary:hover{
  background:var(--primary-d);border-color:var(--primary-d);
  filter:none;transform:none;box-shadow:none;color:#ffffff;
}

/* Clase-num: número blanco sobre morado (el override previo solo cambiaba bg) */
html[data-theme="udemy"] .clase-num{color:#ffffff}
html[data-theme="udemy"] .clase.bonus .clase-num{color:#ffffff}

/* ═══ Bonus clase (.clase.bonus) — en Udemy, fondo claro con borde morado ═══ */
html[data-theme="udemy"] .clase.bonus{
  background:var(--primary-glow);
  border:1px dashed var(--primary);
  border-radius:4px;
}
html[data-theme="udemy"] .clase.bonus::before{
  background:var(--primary);color:#ffffff;
  box-shadow:none;border-radius:4px;
  letter-spacing:.15em;
}
html[data-theme="udemy"] .clase.bonus .clase-label{color:var(--primary-d)}
html[data-theme="udemy"] .clase.bonus h2,
html[data-theme="udemy"] .clase.bonus h3,
html[data-theme="udemy"] .clase.bonus .clase-head{color:var(--text)}

/* Bonus note callout — flat claro */
html[data-theme="udemy"] .bonus-note{
  background:#ffffff;
  border:1px solid var(--border);
  border-left:3px solid var(--primary);
  color:var(--text-d);
  border-radius:4px;
}
html[data-theme="udemy"] .bonus-note strong{color:var(--primary-d)}

/* Callouts en Udemy: tintes más sutiles, bordes claros, texto oscuro */
html[data-theme="udemy"] .callout{border-radius:4px;color:var(--text)}
html[data-theme="udemy"] .callout.info{background:rgba(86,36,208,.06);border-left-color:var(--accent)}
html[data-theme="udemy"] .callout.warn{background:rgba(185,132,7,.08);border-left-color:var(--warn)}
html[data-theme="udemy"] .callout.success{background:rgba(25,122,61,.06);border-left-color:var(--success)}
html[data-theme="udemy"] .callout.key{background:var(--primary-glow);border-left-color:var(--primary)}
html[data-theme="udemy"] .callout.quote{background:#f7f9fa;border-left-color:var(--text-d);color:var(--text)}
html[data-theme="udemy"] .callout strong{color:var(--text)}

/* ═══════════════════════════════════════════════════════════════
   THEME: UDEMY — timeline y puntos de fase
   ═══════════════════════════════════════════════════════════════ */
html[data-theme="udemy"] .timeline::before{
  background:var(--primary-glow);
}
html[data-theme="udemy"] .timeline-item::before{
  background:#fff;
  border:3px solid var(--primary);
  box-shadow:0 0 0 3px var(--primary-glow);
}
html[data-theme="udemy"] .timeline-item .t-year,
html[data-theme="udemy"] .timeline-item h4{
  color:var(--primary-d);
}
html[data-theme="udemy"] .timeline-item p{
  color:var(--text-d);
}

/* ── Reto launcher (compartido por todos los módulos) ─────────────────────── */
.reto-launcher{
  background:linear-gradient(135deg, rgba(56,36,208,.10), rgba(152,202,63,.08));
  border:2px solid var(--primary);
  border-radius:18px;
  padding:32px 28px;
  margin-bottom:22px;
  position:relative;
  overflow:hidden;
}
.reto-launcher::before{
  content:'🏆';
  position:absolute;
  font-size:160px;
  opacity:.05;
  right:-20px;
  top:-30px;
  pointer-events:none;
}
.reto-launcher-tag{
  display:inline-block;
  background:rgba(245,158,11,.15);
  color:#f59e0b;
  border:1px solid rgba(245,158,11,.4);
  padding:6px 14px;
  border-radius:999px;
  font-size:.74rem;
  font-weight:800;
  letter-spacing:.04em;
  margin-bottom:16px;
}
.reto-launcher h3{
  font-size:1.7rem;
  margin:0 0 12px;
  color:var(--text);
  line-height:1.2;
}
.reto-launcher-desc{
  font-size:1rem;
  line-height:1.65;
  color:var(--text);
  margin:0 0 22px;
  max-width:680px;
}
.reto-launcher-stats{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(150px, 1fr));
  gap:12px;
  list-style:none;
  padding:0;
  margin:0 0 22px;
}
.reto-launcher-stats li{
  background:var(--bg-2);
  border:1px solid var(--border);
  border-radius:10px;
  padding:14px;
  display:flex;
  flex-direction:column;
  gap:4px;
  align-items:flex-start;
}
.reto-launcher-stats li strong{
  font-size:1.15rem;
  color:var(--primary);
  font-weight:900;
}
.reto-launcher-stats li span{
  font-size:.78rem;
  color:var(--text-d);
  font-weight:600;
}
.reto-launcher-warn{
  background:rgba(239,68,68,.08);
  border-left:3px solid #ef4444;
  padding:12px 16px;
  border-radius:6px;
  font-size:.86rem;
  color:var(--text);
  margin:0 0 24px;
  line-height:1.55;
}
.reto-launcher-btn,
a.reto-launcher-btn,
a.reto-launcher-btn:link,
a.reto-launcher-btn:visited,
a.reto-launcher-btn:hover,
a.reto-launcher-btn:active{
  display:inline-block;
  background:linear-gradient(135deg, var(--primary), var(--accent-2, var(--primary)));
  color:#fff !important;
  text-decoration:none;
  padding:16px 32px;
  border-radius:10px;
  font-weight:900;
  font-size:1.05rem;
  letter-spacing:.01em;
  box-shadow:none;
  transition:transform .15s, box-shadow .15s;
}
.reto-launcher-btn:hover{
  transform:translateY(-2px);
  box-shadow:none;
}
.reto-launcher-foot{
  margin:18px 0 0;
  font-size:.78rem;
  color:var(--text-d);
}
html[data-theme="udemy"] .reto-launcher{
  background:linear-gradient(135deg, rgba(164,53,240,.12), rgba(86,36,208,.10));
}
html[data-theme="udemy"] a.reto-launcher-btn,
html[data-theme="udemy"] a.reto-launcher-btn:link,
html[data-theme="udemy"] a.reto-launcher-btn:visited,
html[data-theme="udemy"] a.reto-launcher-btn:hover,
html[data-theme="udemy"] a.reto-launcher-btn:active{ color:#fff !important }

/* ── Variante integrador (cubre múltiples módulos) ──────────────────── */
.reto-launcher--integrador{
  background:linear-gradient(135deg, rgba(168,85,247,.14), rgba(56,36,208,.10));
  border-color:#a855f7;
}
.reto-launcher--integrador::before{ content:'🎯' }
.reto-launcher--integrador .reto-launcher-tag{
  background:rgba(168,85,247,.18);
  color:#a855f7;
  border-color:rgba(168,85,247,.45);
}
.reto-launcher--integrador .reto-launcher-stats li strong{
  color:#a855f7;
}
.reto-launcher--integrador a.reto-launcher-btn,
.reto-launcher--integrador a.reto-launcher-btn:link,
.reto-launcher--integrador a.reto-launcher-btn:visited,
.reto-launcher--integrador a.reto-launcher-btn:hover,
.reto-launcher--integrador a.reto-launcher-btn:active{
  background:linear-gradient(135deg, #a855f7, #6d28d9);
  box-shadow:none;
}
.reto-launcher--integrador a.reto-launcher-btn:hover{
  box-shadow:none;
}
html[data-theme="udemy"] .reto-launcher--integrador{
  background:linear-gradient(135deg, rgba(168,85,247,.18), rgba(86,36,208,.12));
}

/* ── Variante caso (análisis de caso real, scenario-based) ──────────── */
.reto-launcher--caso{
  background:linear-gradient(135deg, rgba(14,165,233,.14), rgba(8,145,178,.10));
  border-color:#0ea5e9;
}
.reto-launcher--caso::before{ content:'🔍' }
.reto-launcher--caso .reto-launcher-tag{
  background:rgba(14,165,233,.18);
  color:#0284c7;
  border-color:rgba(14,165,233,.45);
}
.reto-launcher--caso .reto-launcher-stats li strong{
  color:#0284c7;
}
.reto-launcher--caso a.reto-launcher-btn,
.reto-launcher--caso a.reto-launcher-btn:link,
.reto-launcher--caso a.reto-launcher-btn:visited,
.reto-launcher--caso a.reto-launcher-btn:hover,
.reto-launcher--caso a.reto-launcher-btn:active{
  background:linear-gradient(135deg, #0ea5e9, #0369a1);
  box-shadow:none;
}
.reto-launcher--caso a.reto-launcher-btn:hover{
  box-shadow:none;
}
html[data-theme="udemy"] .reto-launcher--caso{
  background:linear-gradient(135deg, rgba(14,165,233,.18), rgba(8,145,178,.12));
}

/* Práctica opcional — colapsable bajo el reto */
.reto-practica{
  background:var(--bg-2);
  border:1px dashed var(--border);
  border-radius:14px;
  padding:0;
  margin-bottom:22px;
}
.reto-practica > summary{
  padding:18px 22px;
  cursor:pointer;
  font-weight:800;
  list-style:none;
  user-select:none;
  font-size:.95rem;
  color:var(--text);
}
.reto-practica > summary::-webkit-details-marker{display:none}
.reto-practica > summary::before{
  content:'▶';
  display:inline-block;
  margin-right:10px;
  transition:transform .2s;
  font-size:.7rem;
  color:var(--text-d);
}
.reto-practica[open] > summary::before{ transform:rotate(90deg) }
.reto-practica-body{
  padding:0 22px 22px;
}
@media (prefers-reduced-motion: reduce){
  .reto-launcher-btn,.reto-practica > summary::before{transition:none}
}