/* ============================================================
   JD Emirates — Academia. Tema "detailing alta gama".
   Negro carbono + plata metálica + ámbar premium.
   ============================================================ */
:root{
  --bg:#07080a;
  --bg-2:#0d0f13;
  --surface:#12151b;
  --surface-2:#171b23;
  --line:#232833;
  --line-2:#2e3542;
  --txt:#eef1f6;
  --txt-dim:#a4adbd;
  --txt-mut:#6b7486;
  --amber:#e8a33d;
  --amber-2:#f6c667;
  --amber-deep:#c47f1c;
  --chrome:#c7cfdb;
  --ok:#3fbf7f;
  --danger:#e5484d;
  --radius:16px;
  --radius-sm:11px;
  --shadow:0 18px 50px -18px rgba(0,0,0,.75);
  --maxw:1180px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --safe-t:env(safe-area-inset-top);
  --safe-b:env(safe-area-inset-bottom);
  font-synthesis:none;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(232,163,61,.10), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(120,140,180,.07), transparent 55%),
    var(--bg);
  color:var(--txt);
  font-family:"Space Grotesk",-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
  min-height:100dvh;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
img,video{max-width:100%;display:block}
::selection{background:rgba(232,163,61,.28)}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* ---- top bar ---- */
.topbar{
  position:sticky;top:0;z-index:40;
  padding-top:var(--safe-t);
  background:linear-gradient(180deg, rgba(7,8,10,.92), rgba(7,8,10,.66) 70%, transparent);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(35,40,51,.6);
}
.topbar-in{display:flex;align-items:center;gap:14px;height:60px}
.brand{display:flex;align-items:center;gap:11px;font-weight:600;letter-spacing:.2px}
.brand .mark{
  width:34px;height:34px;border-radius:9px;flex:none;
  background:linear-gradient(145deg,var(--amber-2),var(--amber-deep));
  display:grid;place-items:center;color:#0a0a0a;box-shadow:0 6px 18px -6px rgba(232,163,61,.6);
}
.brand .mark svg{width:20px;height:20px}
.brand b{font-size:15px}
.brand span{display:block;font-size:11px;color:var(--txt-mut);font-weight:500;letter-spacing:.3px;margin-top:-2px}
.topbar .spacer{flex:1}
.top-progress{display:flex;align-items:center;gap:9px;font-size:12.5px;color:var(--txt-dim)}
.top-progress .bar{width:96px;height:6px;border-radius:99px;background:var(--line);overflow:hidden}
.top-progress .bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--amber),var(--amber-2));border-radius:99px;transition:width .5s var(--ease)}
.iconbtn{
  width:40px;height:40px;border-radius:11px;border:1px solid var(--line);background:var(--surface);
  color:var(--txt-dim);display:grid;place-items:center;cursor:pointer;transition:.18s var(--ease)
}
.iconbtn:hover{color:var(--txt);border-color:var(--line-2);background:var(--surface-2)}
.iconbtn svg{width:19px;height:19px}

/* ---- hero ---- */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.hero video{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  filter:saturate(1.05) contrast(1.02) brightness(.62);
}
.hero .veil{
  position:absolute;inset:0;
  background:
    linear-gradient(180deg, rgba(7,8,10,.35), rgba(7,8,10,.72) 62%, var(--bg) 100%),
    radial-gradient(700px 340px at 20% 30%, rgba(232,163,61,.18), transparent 60%);
}
.hero-in{position:relative;z-index:2;padding:54px 0 42px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:600;letter-spacing:1.6px;
  text-transform:uppercase;color:var(--amber-2);
  border:1px solid rgba(232,163,61,.32);background:rgba(232,163,61,.08);
  padding:6px 12px;border-radius:99px;margin-bottom:18px
}
.eyebrow .dot{width:6px;height:6px;border-radius:99px;background:var(--amber);box-shadow:0 0 10px var(--amber)}
.hero h1{
  font-size:clamp(30px,6vw,52px);line-height:1.03;margin:0 0 14px;font-weight:600;letter-spacing:-.5px;
  max-width:16ch;text-wrap:balance
}
.hero h1 em{font-style:normal;color:var(--amber-2)}
.hero p.lead{font-size:clamp(15px,2.4vw,18px);color:var(--txt-dim);max-width:52ch;margin:0 0 26px}
.hero-stats{display:flex;flex-wrap:wrap;gap:26px}
.hstat .k{font-size:clamp(22px,4vw,30px);font-weight:600;letter-spacing:-.5px;font-variant-numeric:tabular-nums}
.hstat .k b{color:var(--amber-2);font-weight:600}
.hstat .l{font-size:12px;color:var(--txt-mut);text-transform:uppercase;letter-spacing:1px;margin-top:2px}
.hero-cta{margin-top:30px;display:flex;gap:12px;flex-wrap:wrap}

/* ---- buttons ---- */
.btn{
  display:inline-flex;align-items:center;gap:9px;cursor:pointer;
  padding:13px 20px;border-radius:12px;font-weight:600;font-size:14.5px;
  border:1px solid transparent;transition:.18s var(--ease);white-space:nowrap
}
.btn svg{width:18px;height:18px}
.btn-primary{background:linear-gradient(145deg,var(--amber-2),var(--amber-deep));color:#0a0a0a;box-shadow:0 12px 30px -12px rgba(232,163,61,.7)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 16px 36px -12px rgba(232,163,61,.8)}
.btn-ghost{background:rgba(255,255,255,.04);border-color:var(--line-2);color:var(--txt)}
.btn-ghost:hover{background:rgba(255,255,255,.08);border-color:var(--chrome)}

/* ---- controls row ---- */
.controls{display:flex;gap:12px;align-items:center;margin:30px 0 20px;flex-wrap:wrap}
.search{position:relative;flex:1;min-width:220px}
.search svg{position:absolute;left:14px;top:50%;transform:translateY(-50%);width:18px;height:18px;color:var(--txt-mut)}
.search input{
  width:100%;padding:13px 14px 13px 42px;border-radius:12px;border:1px solid var(--line);
  background:var(--surface);color:var(--txt);font-size:16px;outline:none;transition:.18s var(--ease)
}
.search input:focus{border-color:var(--amber-deep);box-shadow:0 0 0 3px rgba(232,163,61,.14)}
.search input::placeholder{color:var(--txt-mut)}
.seg{display:flex;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:4px;gap:2px}
.seg button{
  border:none;background:transparent;color:var(--txt-dim);padding:9px 14px;border-radius:9px;
  font-size:13.5px;font-weight:600;cursor:pointer;transition:.16s var(--ease);white-space:nowrap
}
.seg button.on{background:var(--surface-2);color:var(--txt);box-shadow:0 1px 0 rgba(255,255,255,.04) inset,0 6px 16px -10px #000}

/* ---- section head ---- */
.sec-head{display:flex;align-items:baseline;gap:12px;margin:34px 0 16px}
.sec-head h2{font-size:20px;font-weight:600;margin:0;letter-spacing:-.3px}
.sec-head .count{font-size:13px;color:var(--txt-mut)}
.sec-head .rule{flex:1;height:1px;background:linear-gradient(90deg,var(--line),transparent)}

/* ---- lesson list ---- */
.lessons{display:grid;gap:10px}
.lesson{
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:16px;
  padding:14px 16px;border-radius:var(--radius-sm);border:1px solid var(--line);
  background:linear-gradient(180deg,var(--surface),var(--bg-2));
  cursor:pointer;transition:.16s var(--ease);position:relative;overflow:hidden
}
.lesson:hover{border-color:var(--line-2);transform:translateX(2px)}
.lesson::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:transparent;transition:.16s var(--ease)}
.lesson:hover::before{background:linear-gradient(180deg,var(--amber),var(--amber-deep))}
.lesson.done::before{background:var(--ok)}
.lesson.playing{border-color:var(--amber-deep);background:linear-gradient(180deg,rgba(232,163,61,.10),var(--bg-2))}
.lesson.playing::before{background:linear-gradient(180deg,var(--amber),var(--amber-deep))}
.l-num{
  width:44px;height:44px;border-radius:11px;flex:none;display:grid;place-items:center;
  font-weight:600;font-size:15px;font-variant-numeric:tabular-nums;
  background:var(--surface-2);border:1px solid var(--line);color:var(--txt-dim);position:relative
}
.lesson.done .l-num{color:var(--ok);border-color:rgba(63,191,127,.35)}
.lesson.playing .l-num{background:linear-gradient(145deg,var(--amber-2),var(--amber-deep));color:#0a0a0a;border-color:transparent}
.l-main{min-width:0}
.l-title{font-size:15px;font-weight:500;line-height:1.35;margin-bottom:5px;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.l-meta{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--txt-mut)}
.l-meta .chip{display:inline-flex;align-items:center;gap:5px}
.l-meta svg{width:13px;height:13px}
.l-pbar{height:3px;border-radius:99px;background:var(--line);margin-top:8px;overflow:hidden;max-width:230px}
.l-pbar i{display:block;height:100%;background:linear-gradient(90deg,var(--amber),var(--amber-2));border-radius:99px;width:0}
.l-side{display:flex;align-items:center;gap:8px;color:var(--txt-mut)}
.l-side .dur{font-size:13px;font-variant-numeric:tabular-nums;color:var(--txt-dim)}
.l-side .play{width:38px;height:38px;border-radius:10px;background:var(--surface-2);border:1px solid var(--line);display:grid;place-items:center;transition:.16s var(--ease)}
.lesson:hover .l-side .play{background:linear-gradient(145deg,var(--amber-2),var(--amber-deep));color:#0a0a0a;border-color:transparent}
.l-side .play svg{width:16px;height:16px;margin-left:2px}
.badge-live{font-size:10px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;color:var(--amber-2);border:1px solid rgba(232,163,61,.3);padding:2px 6px;border-radius:6px}

/* ---- slides / materials grid ---- */
.mats{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}
.mat{
  display:flex;align-items:center;gap:13px;padding:15px;border-radius:var(--radius-sm);
  border:1px solid var(--line);background:linear-gradient(180deg,var(--surface),var(--bg-2));
  cursor:pointer;transition:.16s var(--ease)
}
.mat:hover{border-color:var(--line-2);transform:translateY(-2px);box-shadow:var(--shadow)}
.mat .pdf-ic{width:42px;height:42px;border-radius:10px;flex:none;display:grid;place-items:center;background:rgba(229,72,77,.12);border:1px solid rgba(229,72,77,.25);color:#ff7a7e}
.mat .pdf-ic svg{width:20px;height:20px}
.mat .nm{font-size:13.5px;font-weight:500;line-height:1.35}
.mat .sub{font-size:11.5px;color:var(--txt-mut);margin-top:2px}

/* ---- player modal ---- */
.modal{position:fixed;inset:0;z-index:80;display:none}
.modal.open{display:block}
.modal-veil{position:absolute;inset:0;background:rgba(3,4,6,.82);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);animation:fade .2s var(--ease)}
.sheet{
  position:absolute;inset:0;overflow-y:auto;-webkit-overflow-scrolling:touch;
  padding:0 0 calc(40px + var(--safe-b))
}
.player-top{
  position:sticky;top:0;z-index:5;display:flex;align-items:center;gap:12px;
  padding:calc(12px + var(--safe-t)) 18px 12px;
  background:linear-gradient(180deg,rgba(7,8,10,.96),rgba(7,8,10,.7) 80%,transparent);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)
}
.player-top .t{flex:1;min-width:0}
.player-top .t b{font-size:15px;font-weight:600;display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.player-top .t span{font-size:12px;color:var(--txt-mut)}
.p-wrap{max-width:1020px;margin:0 auto;padding:0 18px}
.video-shell{position:relative;background:#000;border-radius:14px;overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow);aspect-ratio:16/9}
.video-shell video{width:100%;height:100%;background:#000}
.video-loading{position:absolute;inset:0;display:grid;place-items:center;color:var(--txt-mut);font-size:13px;gap:10px;pointer-events:none}
.spinner{width:34px;height:34px;border-radius:50%;border:3px solid var(--line);border-top-color:var(--amber);animation:spin .8s linear infinite;margin:0 auto}
.p-nav{display:flex;gap:10px;margin-top:14px}
.p-nav button{flex:1;justify-content:center}
.p-nav button:disabled{opacity:.4;cursor:not-allowed}

/* ---- study tabs ---- */
.tabs{display:flex;gap:4px;margin:22px 0 0;border-bottom:1px solid var(--line);overflow-x:auto;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tabs button{
  border:none;background:transparent;color:var(--txt-dim);font-weight:600;font-size:14px;
  padding:12px 14px;cursor:pointer;position:relative;white-space:nowrap;transition:.15s
}
.tabs button.on{color:var(--txt)}
.tabs button.on::after{content:"";position:absolute;left:12px;right:12px;bottom:-1px;height:2px;background:linear-gradient(90deg,var(--amber),var(--amber-2));border-radius:2px}
.tabpane{display:none;padding:20px 2px 8px;animation:fade .2s var(--ease)}
.tabpane.on{display:block}
.markdown{font-size:15px;color:var(--txt-dim);line-height:1.72}
.markdown h1{font-size:21px;color:var(--txt);margin:.2em 0 .5em;font-weight:600;letter-spacing:-.3px}
.markdown h2{font-size:16px;color:var(--amber-2);margin:1.4em 0 .5em;font-weight:600;letter-spacing:.3px;text-transform:uppercase}
.markdown h3{font-size:15px;color:var(--txt);margin:1.1em 0 .4em}
.markdown p{margin:.6em 0}
.markdown ul,.markdown ol{margin:.5em 0;padding-left:1.3em}
.markdown li{margin:.4em 0}
.markdown li::marker{color:var(--amber-deep)}
.markdown strong{color:var(--txt);font-weight:600}
.markdown code{background:var(--surface-2);padding:2px 6px;border-radius:6px;font-size:.9em;color:var(--amber-2)}
.quiz-q{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px;margin:12px 0}
.quiz-q .q{font-weight:600;color:var(--txt);margin-bottom:10px}
.quiz-opt{display:block;padding:10px 13px;border:1px solid var(--line);border-radius:9px;margin:7px 0;cursor:pointer;font-size:14px;color:var(--txt-dim);transition:.14s var(--ease)}
.quiz-opt:hover{border-color:var(--line-2);background:var(--surface-2)}
.quiz-opt.correct{border-color:rgba(63,191,127,.5);background:rgba(63,191,127,.10);color:#a9e7c6}
.quiz-opt.wrong{border-color:rgba(229,72,77,.5);background:rgba(229,72,77,.10);color:#f3a9ab}
.transcript-box{font-size:14.5px;color:var(--txt-dim);line-height:1.8;white-space:pre-wrap;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px;max-height:60vh;overflow:auto}
.empty{color:var(--txt-mut);font-size:14px;padding:30px 0;text-align:center}

/* ---- pdf modal ---- */
.pdf-modal{position:fixed;inset:0;z-index:90;display:none;background:rgba(3,4,6,.9)}
.pdf-modal.open{display:flex;flex-direction:column}
.pdf-bar{display:flex;align-items:center;gap:12px;padding:calc(12px + var(--safe-t)) 18px 12px;background:var(--bg-2);border-bottom:1px solid var(--line)}
.pdf-bar b{flex:1;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pdf-modal iframe{flex:1;border:none;width:100%;background:#333}

/* ---- footer ---- */
.foot{padding:40px 0 calc(40px + var(--safe-b));color:var(--txt-mut);font-size:12.5px;text-align:center;border-top:1px solid var(--line);margin-top:44px}
.foot b{color:var(--txt-dim)}

/* ---- toast ---- */
.toast{position:fixed;left:50%;bottom:calc(24px + var(--safe-b));transform:translateX(-50%) translateY(20px);
  background:var(--surface-2);border:1px solid var(--line-2);color:var(--txt);padding:12px 18px;border-radius:12px;
  font-size:13.5px;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.3s var(--ease);z-index:120}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---- install banner ---- */
.install{display:none;align-items:center;gap:12px;margin:18px 0 0;padding:13px 15px;border-radius:12px;
  border:1px solid rgba(232,163,61,.3);background:rgba(232,163,61,.07)}
.install.show{display:flex}
.install .txt{flex:1;font-size:13px;color:var(--txt-dim)}
.install .txt b{color:var(--txt)}

@keyframes fade{from{opacity:0}to{opacity:1}}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---- responsive ---- */
@media(max-width:640px){
  .wrap{padding:0 15px}
  .hero-in{padding:38px 0 30px}
  .hero-stats{gap:18px}
  .lesson{grid-template-columns:auto 1fr;gap:13px;padding:13px}
  .l-side{grid-column:2;justify-content:flex-end;margin-top:2px}
  .l-side .play{display:none}
  .brand span{display:none}
  .controls{gap:9px}
  .p-wrap{padding:0 12px}
  .btn{padding:12px 16px}
}
@media(min-width:641px){ .hero video{filter:saturate(1.05) contrast(1.02) brightness(.55)} }
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}