*{box-sizing:border-box}
  .w{
    --blue:#0385FF;--blue-dk:#0270D9;--blue-2:#0257B8;--blue-soft:#EAF4FF;--blue-line:rgba(3,133,255,.24);
    --navy:#0B1B33;--violet:#6D5EF6;--cyan:#22D3EE;
    --ink:#0B1220;--ink-2:#3D4859;--ink-3:#6B7688;
    --bg:#fff;--bg-2:#F5F8FC;--bg-3:#ECF2F9;--card:#fff;
    --hair:#E5EBF3;--hair-2:#EEF3F8;
    --amber:#B45309;--amber-bg:#FEF6E7;--amber-line:#F59E0B;
    --green:#15803D;--green-bg:#E9F7EE;--green-line:#16A34A;
    --red:#C2342B;--red-bg:#FDECEA;--red-line:#EF4444;
    --sh-1:0 1px 1px rgba(11,27,51,.05),0 2px 2px rgba(11,27,51,.045),0 4px 5px rgba(11,27,51,.04),0 7px 10px rgba(11,27,51,.035),0 12px 18px rgba(11,27,51,.03);
    --sh-2:0 1px 1px rgba(11,27,51,.05),0 2px 3px rgba(11,27,51,.045),0 5px 8px rgba(11,27,51,.05),0 10px 16px rgba(11,27,51,.055),0 18px 30px rgba(11,27,51,.06),0 30px 48px rgba(11,27,51,.07);
    --sh-3:0 2px 2px rgba(11,27,51,.05),0 5px 7px rgba(11,27,51,.05),0 11px 15px rgba(11,27,51,.055),0 21px 30px rgba(11,27,51,.06),0 38px 56px rgba(11,27,51,.08),0 64px 96px rgba(11,27,51,.10);
    --sh-blue:0 10px 26px rgba(3,133,255,.32);
    --dot:rgba(11,27,51,.05);
    --page-grad:linear-gradient(180deg,#EAF1FC 0%,#EFF5FD 22%,#F7FAFE 55%,#FFFFFF 100%);
    --font:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
    color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  }
  .w[data-theme="dark"]{
    --blue:#3D9EFF;--blue-dk:#5AB0FF;--blue-2:#7CC0FF;--blue-soft:rgba(61,158,255,.10);--blue-line:rgba(61,158,255,.30);
    --navy:#0A1426;--violet:#8B7DFF;--cyan:#34E0F0;
    --ink:#F1F6FC;--ink-2:#C5D0DE;--ink-3:#8C99AC;
    --bg:#0A1322;--bg-2:#0E1728;--bg-3:#141E33;--card:#111B2F;
    --hair:rgba(148,163,184,.16);--hair-2:rgba(148,163,184,.10);
    --amber:#FCD34D;--amber-bg:rgba(245,158,11,.12);--amber-line:#F59E0B;
    --green:#4ADE80;--green-bg:rgba(34,197,94,.12);--green-line:#16A34A;
    --red:#FCA5A5;--red-bg:rgba(239,68,68,.12);--red-line:#EF4444;
    --sh-1:inset 0 1px 0 rgba(255,255,255,.05),0 1px 2px rgba(0,0,0,.45),0 2px 5px rgba(0,0,0,.4),0 5px 10px rgba(0,0,0,.38);
    --sh-2:inset 0 1px 0 rgba(255,255,255,.06),0 1px 2px rgba(0,0,0,.5),0 3px 7px rgba(0,0,0,.45),0 7px 15px rgba(0,0,0,.48),0 15px 30px rgba(0,0,0,.52);
    --sh-3:inset 0 1px 0 rgba(255,255,255,.07),0 2px 4px rgba(0,0,0,.5),0 6px 13px rgba(0,0,0,.48),0 14px 28px rgba(0,0,0,.52),0 28px 52px rgba(0,0,0,.56);
    --sh-blue:0 12px 30px rgba(3,133,255,.4);
    --dot:rgba(160,185,220,.07);
    --page-grad:radial-gradient(135% 95% at 50% 6%,#14203A 0%,#0C1426 40%,#080D1A 74%,#05080F 100%);
  }
  .w a{text-decoration:none;color:inherit}
  .w ::selection{background:rgba(3,133,255,.25)}
  .w h1,.w h2,.w h3,.w h4{font-weight:800;letter-spacing:-.02em;text-wrap:balance;margin:0}

  @keyframes wAura{0%{transform:translate3d(-3%,-2%,0) scale(1)}50%{transform:translate3d(4%,3%,0) scale(1.08)}100%{transform:translate3d(-3%,-2%,0) scale(1)}}
  @keyframes wPulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.35;transform:scale(.82)}}
  @keyframes wFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
  @keyframes wShimmer{0%{background-position:-200% 0}100%{background-position:200% 0}}
  @keyframes wRing{0%{transform:scale(.9);opacity:.7}70%{transform:scale(1.5);opacity:0}100%{opacity:0}}
  @keyframes wBars{0%,100%{height:5px}50%{height:15px}}
  .w .rv{opacity:0;transform:translateY(22px);transition:opacity .6s cubic-bezier(.2,.7,.2,1),transform .6s cubic-bezier(.2,.7,.2,1)}
  .w .rv.in{opacity:1;transform:none}
  .w .lift{transition:transform .26s cubic-bezier(.2,.7,.2,1),box-shadow .26s,border-color .26s}
  .w .lift:hover{transform:translateY(-5px);box-shadow:var(--sh-3);border-color:var(--blue-line)}
  @media(prefers-reduced-motion:reduce){.w *{animation:none!important}.w .rv{opacity:1;transform:none}}

  .w{background:var(--bg);min-height:100vh}
  .w .page-bg{position:fixed;inset:0;background:var(--page-grad);z-index:-1}
  .w .dots{position:fixed;inset:0;z-index:-1;opacity:.55;background-image:radial-gradient(var(--dot) 1px,transparent 1px);background-size:26px 26px;-webkit-mask-image:linear-gradient(180deg,#000,transparent 60%);mask-image:linear-gradient(180deg,#000,transparent 60%)}
  .w .aura{position:fixed;z-index:-1;filter:blur(55px);opacity:.45;pointer-events:none;animation:wAura 20s ease-in-out infinite}
  .w .aura.a1{top:-140px;left:-90px;width:520px;height:520px;background:radial-gradient(circle at 30% 30%,rgba(3,133,255,.35),transparent 62%)}
  .w .aura.a2{top:20px;right:-140px;width:460px;height:460px;background:radial-gradient(circle at 60% 40%,rgba(109,94,246,.3),transparent 64%);animation-duration:24s}
  .w .scr{position:relative;z-index:1;display:none}
  .w .scr.show{display:block}

  /* atoms */
  .w .wrap{max-width:1240px;margin:0 auto;padding:0 24px}
  .w .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;font-size:14px;border-radius:11px;padding:11px 18px;cursor:pointer;border:1px solid transparent;transition:transform .2s,box-shadow .2s,background .2s;font-family:inherit}
  .w .btn-primary{background:var(--blue);color:#fff;box-shadow:var(--sh-blue)}
  .w .btn-primary:hover{transform:translateY(-2px);background:var(--blue-dk)}
  .w .btn-ghost{background:var(--card);color:var(--ink);border-color:var(--hair);box-shadow:var(--sh-1)}
  .w .btn-ghost:hover{transform:translateY(-2px);border-color:var(--blue-line);color:var(--blue-dk)}
  .w .btn-sm{padding:8px 13px;font-size:13px;border-radius:9px}
  .w .btn-lg{padding:14px 22px;font-size:15px;border-radius:13px}
  .w .eyebrow{display:inline-flex;align-items:center;gap:7px;font-weight:700;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--blue-dk);background:var(--blue-soft);border:1px solid var(--blue-line);padding:6px 11px;border-radius:50px}
  .w .card{background:var(--card);border:1px solid var(--hair);border-radius:18px;box-shadow:var(--sh-1)}
  .w .av{border-radius:50%;display:grid;place-items:center;font-weight:700;color:#fff;flex:none}
  .w .tag{font-size:11.5px;font-weight:700;color:var(--ink-2);background:var(--bg-3);border:1px solid var(--hair);padding:4px 9px;border-radius:50px}
  .w .icon-btn{width:38px;height:38px;border-radius:10px;border:1px solid var(--hair);background:var(--card);display:grid;place-items:center;cursor:pointer;color:var(--ink-2);box-shadow:var(--sh-1);transition:.2s}
  .w .icon-btn:hover{border-color:var(--blue-line);color:var(--blue-dk);transform:translateY(-1px)}
  .w .live{display:inline-flex;align-items:center;gap:7px;font-weight:800;font-size:11px;letter-spacing:.07em;text-transform:uppercase;color:#fff;background:var(--red-line);padding:5px 10px;border-radius:7px}
  .w .live .dot{width:7px;height:7px;border-radius:50%;background:#fff;animation:wPulse 1.4s ease-in-out infinite}
  .w .live.soft{color:var(--red);background:var(--red-bg);border:1px solid var(--red-line)}
  .w .live.soft .dot{background:var(--red-line)}
  .w .pill-badge{display:inline-flex;align-items:center;gap:6px;font-size:11.5px;font-weight:700;padding:4px 9px;border-radius:50px;border:1px solid}
  .w .pb-green{color:var(--green);background:var(--green-bg);border-color:var(--green-line)}
  .w .pb-amber{color:var(--amber);background:var(--amber-bg);border-color:var(--amber-line)}
  .w .pb-blue{color:var(--blue-dk);background:var(--blue-soft);border-color:var(--blue-line)}
  .w .field{display:block;margin-bottom:14px}
  .w .field label{display:block;font-size:12.5px;font-weight:700;color:var(--ink-2);margin-bottom:6px}
  .w .field input,.w .field select{width:100%;border:1px solid var(--hair);background:var(--bg-2);border-radius:11px;padding:12px 14px;font-size:14px;color:var(--ink);outline:none;font-family:inherit;transition:.18s}
  .w .field input:focus,.w .field select:focus{border-color:var(--blue-line);box-shadow:0 0 0 3px var(--blue-soft);background:var(--card)}
  .w .eq{display:inline-flex;align-items:flex-end;gap:2px;height:15px}
  .w .eq i{width:3px;background:currentColor;border-radius:2px;animation:wBars 1s ease-in-out infinite}
  .w .eq i:nth-child(2){animation-delay:.15s}.w .eq i:nth-child(3){animation-delay:.3s}.w .eq i:nth-child(4){animation-delay:.45s}

  /* ===== MARKETING HEADER ===== */
  .w .hd{position:sticky;top:0;z-index:40;border-bottom:1px solid var(--hair);background:color-mix(in oklab,var(--bg) 82%,transparent);backdrop-filter:saturate(180%) blur(16px)}
  .w .hd-in{display:flex;align-items:center;gap:16px;height:64px}
  .w .brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:-.02em}
  .w .brand .mk{width:32px;height:32px;border-radius:9px;background:linear-gradient(140deg,var(--blue),var(--violet));display:grid;place-items:center;color:#fff;box-shadow:var(--sh-blue);position:relative;font-weight:800}
  .w .brand .mk::after{content:"";position:absolute;right:-2px;top:-2px;width:9px;height:9px;border-radius:50%;background:var(--red-line);border:2px solid var(--bg);animation:wPulse 1.6s ease-in-out infinite}
  .w .navlink{position:relative;transition:color .2s;padding:8px 12px;border-radius:8px;font-weight:600;font-size:14px;color:var(--ink-2)}
  .w .navlink::after{content:"";position:absolute;left:12px;right:12px;bottom:3px;height:2px;background:var(--blue);border-radius:2px;transform:scaleX(0);transform-origin:left;transition:transform .25s}
  .w .navlink:hover{color:var(--blue-dk)}.w .navlink:hover::after{transform:scaleX(1)}
  .w .spacer{flex:1}

  /* ===== APP SHELL (dashboards) ===== */
  .w .shell{display:grid;grid-template-columns:248px 1fr;min-height:100vh}
  .w .side{border-right:1px solid var(--hair);background:color-mix(in oklab,var(--card) 70%,transparent);backdrop-filter:blur(8px);padding:18px 14px;display:flex;flex-direction:column;gap:6px;position:sticky;top:0;height:100vh}
  .w .side .brand{padding:6px 8px 16px}
  .w .side-lbl{font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);padding:14px 12px 6px}
  .w .side-item{display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:11px;font-size:14px;font-weight:600;color:var(--ink-2);cursor:pointer;transition:.16s}
  .w .side-item:hover{background:var(--bg-2);color:var(--ink)}
  .w .side-item.on{background:var(--blue-soft);color:var(--blue-dk);border:1px solid var(--blue-line)}
  .w .side-item .i{width:20px;text-align:center;font-size:15px}
  .w .side-item .badge{margin-left:auto;font-size:10.5px;font-weight:800;color:#fff;background:var(--red-line);padding:1px 7px;border-radius:50px}
  .w .side-foot{margin-top:auto;border-top:1px solid var(--hair);padding-top:12px;display:flex;align-items:center;gap:10px}
  .w .main{min-width:0;display:flex;flex-direction:column}
  .w .topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:14px;padding:14px 26px;border-bottom:1px solid var(--hair);background:color-mix(in oklab,var(--bg) 80%,transparent);backdrop-filter:blur(14px)}
  .w .topbar h1{font-size:20px}
  .w .search{display:flex;align-items:center;gap:9px;background:var(--card);border:1px solid var(--hair);border-radius:11px;padding:9px 13px;box-shadow:var(--sh-1);color:var(--ink-3);font-size:13.5px;min-width:200px}
  .w .content{padding:26px;position:relative;z-index:1}

  /* stat cards */
  .w .g4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
  .w .g3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
  .w .g2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
  .w .stat{padding:18px 20px;border-radius:16px}
  .w .stat .top{display:flex;align-items:center;justify-content:space-between}
  .w .stat .ic{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;font-size:16px}
  .w .stat .n{font-size:28px;font-weight:800;letter-spacing:-.02em;margin-top:12px;font-variant-numeric:tabular-nums}
  .w .stat .l{color:var(--ink-3);font-size:13px;font-weight:600;margin-top:2px}
  .w .stat .delta{font-size:12px;font-weight:700}

  /* section header inside content */
  .w .sh{display:flex;align-items:center;justify-content:space-between;margin:28px 0 14px}
  .w .sh h2{font-size:18px}
  .w .sh a{font-size:13px;font-weight:700;color:var(--blue-dk);cursor:pointer}

  /* course/class list rows */
  .w .row-card{display:flex;align-items:center;gap:14px;padding:14px 16px;border-radius:14px;border:1px solid var(--hair);background:var(--card);box-shadow:var(--sh-1);margin-bottom:11px}
  .w .cov-sq{width:56px;height:56px;border-radius:12px;display:grid;place-items:center;color:#fff;font-weight:800;font-size:15px;flex:none}
  .w .row-card .info{flex:1;min-width:0}
  .w .row-card .info h4{font-size:15px;font-weight:700}
  .w .row-card .info p{margin:3px 0 0;font-size:12.5px;color:var(--ink-3)}
  .w .prog{height:6px;border-radius:50px;background:var(--bg-3);position:relative;overflow:hidden}
  .w .prog i{position:absolute;left:0;top:0;bottom:0;background:var(--blue);border-radius:50px}

  /* catalog card */
  .w .course{border-radius:18px;overflow:hidden;cursor:pointer}
  .w .course .cov{aspect-ratio:16/9;position:relative;display:grid;place-items:center;color:#fff}
  .w .course .cov .subj{font-weight:800;font-size:26px;opacity:.92;letter-spacing:-.02em}
  .w .course .body{padding:15px 17px 17px}
  .w .course .body h3{font-size:16px}
  .w .course .meta{display:flex;align-items:center;gap:8px;margin-top:11px;color:var(--ink-3);font-size:12.5px}

  /* schedule / calendar */
  .w .cal{display:grid;grid-template-columns:56px repeat(5,1fr);gap:1px;background:var(--hair);border:1px solid var(--hair);border-radius:16px;overflow:hidden}
  .w .cal .cell{background:var(--card);min-height:64px;padding:6px}
  .w .cal .hd-cell{background:var(--bg-2);text-align:center;padding:10px 4px;font-size:12px;font-weight:800;color:var(--ink-2)}
  .w .cal .hd-cell small{display:block;color:var(--ink-3);font-weight:600;font-size:11px}
  .w .cal .time{background:var(--bg-2);font-size:11px;color:var(--ink-3);text-align:right;padding:6px 8px;font-weight:600}
  .w .ev{border-radius:9px;padding:7px 9px;font-size:11.5px;font-weight:700;line-height:1.3;margin-bottom:4px;border-left:3px solid}
  .w .ev.blue{background:var(--blue-soft);color:var(--blue-dk);border-color:var(--blue)}
  .w .ev.violet{background:rgba(109,94,246,.12);color:var(--violet);border-color:var(--violet)}
  .w .ev.green{background:var(--green-bg);color:var(--green);border-color:var(--green-line)}
  .w .ev.live{background:var(--red-bg);color:var(--red);border-color:var(--red-line)}
  .w .ev small{display:block;font-weight:600;opacity:.8;font-size:10.5px}

  /* ===== AUTH ===== */
  .w .auth{display:grid;grid-template-columns:1.05fr .95fr;min-height:100vh}
  .w .auth-brand{position:relative;overflow:hidden;padding:56px;display:flex;flex-direction:column;justify-content:space-between;color:#fff;background:radial-gradient(120% 120% at 20% 0%,#12325e,#0B1B33 55%,#081226)}
  .w .auth-brand .aura2{position:absolute;filter:blur(60px);opacity:.5;animation:wAura 22s ease-in-out infinite}
  .w .auth-quote{position:relative;max-width:30ch}
  .w .auth-quote h2{font-size:30px;line-height:1.2;color:#fff}
  .w .auth-quote p{color:rgba(255,255,255,.7);margin-top:14px;line-height:1.6}
  .w .auth-side-form{display:grid;place-items:center;padding:40px;position:relative;z-index:1}
  .w .auth-card{width:100%;max-width:392px}
  .w .auth-card h1{font-size:26px}
  .w .auth-card .sub{color:var(--ink-3);font-size:14px;margin:8px 0 26px}
  .w .role-pick{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:18px}
  .w .role-opt{border:1px solid var(--hair);border-radius:13px;padding:14px;cursor:pointer;text-align:center;transition:.18s;background:var(--card)}
  .w .role-opt:hover{border-color:var(--blue-line)}
  .w .role-opt.on{border-color:var(--blue);background:var(--blue-soft);box-shadow:0 0 0 3px var(--blue-soft)}
  .w .role-opt .ri{font-size:22px}
  .w .role-opt .rt{font-weight:800;font-size:14px;margin-top:6px}
  .w .role-opt .rd{font-size:11.5px;color:var(--ink-3);margin-top:2px}
  .w .divider{display:flex;align-items:center;gap:12px;color:var(--ink-3);font-size:12px;margin:18px 0}
  .w .divider::before,.w .divider::after{content:"";flex:1;height:1px;background:var(--hair)}

  /* ===== START-CLASS SETUP ===== */
  .w .setup{min-height:100vh;display:grid;place-items:center;padding:40px 24px}
  .w .setup-card{width:100%;max-width:920px;display:grid;grid-template-columns:1fr 360px;gap:0;border-radius:22px;overflow:hidden;box-shadow:var(--sh-3);border:1px solid var(--hair);background:var(--card)}
  .w .self-preview{position:relative;min-width:0;min-height:400px;background:radial-gradient(120% 90% at 30% 20%,rgba(109,94,246,.35),transparent 55%),linear-gradient(160deg,#0B1B33,#0A1322);display:grid;place-items:center}
  .w .self-preview .selfav{width:110px;height:110px;border-radius:50%;background:linear-gradient(140deg,#2b3f63,#0d1a30);border:3px solid rgba(255,255,255,.16);display:grid;place-items:center;color:#cfe0f5;font-size:38px;font-weight:800}
  .w .self-preview .devbar{position:absolute;bottom:14px;left:50%;transform:translateX(-50%);display:flex;gap:10px}
  .w .dev-btn{width:46px;height:46px;border-radius:13px;background:rgba(255,255,255,.14);backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.2);display:grid;place-items:center;color:#fff;cursor:pointer;transition:.18s}
  .w .dev-btn:hover{background:rgba(255,255,255,.24)}
  .w .dev-btn.off{background:rgba(194,52,43,.8);border-color:transparent}
  .w .setup-side{padding:26px}
  .w .setup-side h2{font-size:20px}
  .w .qopts{display:flex;gap:8px;margin-top:6px}
  .w .qopt{flex:1;text-align:center;border:1px solid var(--hair);border-radius:10px;padding:9px;font-size:12.5px;font-weight:700;cursor:pointer;color:var(--ink-2);transition:.16s}
  .w .qopt.on{border-color:var(--blue);background:var(--blue-soft);color:var(--blue-dk)}

  /* ===== WAITING ROOM ===== */
  .w .waiting{min-height:100vh;display:grid;place-items:center;padding:40px 24px;position:relative;z-index:1}
  .w .waiting-card{width:100%;max-width:560px;text-align:center}
  .w .pulse-orb{width:120px;height:120px;margin:0 auto 8px;border-radius:50%;display:grid;place-items:center;position:relative;background:linear-gradient(140deg,var(--blue),var(--violet));color:#fff;font-size:40px;box-shadow:var(--sh-blue)}
  .w .pulse-orb::before,.w .pulse-orb::after{content:"";position:absolute;inset:0;border-radius:50%;border:2px solid var(--blue);animation:wRing 2.4s ease-out infinite}
  .w .pulse-orb::after{animation-delay:1.2s}
  .w .join-avs{display:flex;justify-content:center;margin-top:22px}
  .w .join-avs .av{width:36px;height:36px;border:2px solid var(--card);margin-left:-8px;font-size:13px}

  /* ===== HERO (landing) ===== */
  .w .hero{display:grid;grid-template-columns:1.05fr .95fr;gap:46px;align-items:center;padding:66px 0 44px}
  .w .hero h1{font-size:clamp(34px,5vw,54px);line-height:1.05;margin-top:18px}
  .w .hero p.sub{color:var(--ink-2);font-size:clamp(16px,1.4vw,18px);line-height:1.55;margin:18px 0 26px;max-width:44ch}
  .w .stats-row{display:flex;gap:28px;margin-top:30px;flex-wrap:wrap}
  .w .stats-row .n{font-size:28px;font-weight:800;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
  .w .stats-row .l{color:var(--ink-3);font-size:12.5px;font-weight:600;margin-top:2px}
  .w .preview{position:relative;border-radius:22px;overflow:hidden;box-shadow:var(--sh-3);border:1px solid var(--hair);animation:wFloat 7s ease-in-out infinite}
  .w .preview .vid{aspect-ratio:16/10;background:radial-gradient(120% 80% at 30% 20%,rgba(109,94,246,.5),transparent 60%),radial-gradient(120% 90% at 80% 90%,rgba(3,133,255,.55),transparent 62%),linear-gradient(160deg,#0B1B33,#0A1322);position:relative;display:grid;place-items:center}
  .w .preview .prof-av{width:92px;height:92px;border-radius:50%;background:linear-gradient(140deg,#2b3f63,#0d1a30);border:3px solid rgba(255,255,255,.16);display:grid;place-items:center;color:#cfe0f5;font-size:30px;font-weight:800}
  .w .preview .ov{position:absolute;left:14px;top:14px;right:14px;display:flex;justify-content:space-between}
  .w .preview .glass{background:rgba(6,12,24,.6);backdrop-filter:blur(8px);color:#fff;font-size:12px;font-weight:700;padding:6px 10px;border-radius:8px;display:inline-flex;align-items:center;gap:7px}
  .w .preview .cap{position:absolute;left:14px;bottom:14px;color:#fff}
  .w .preview .cap .t{font-weight:800;font-size:15px}
  .w .preview .cap .s{font-size:12px;opacity:.85;margin-top:2px}
  .w .sec{padding:52px 0}
  .w .sec-head{max-width:640px;margin-bottom:30px}
  .w .sec-head h2{font-size:clamp(25px,3.2vw,36px);line-height:1.15;margin-top:12px}
  .w .sec-head p{color:var(--ink-2);font-size:15.5px;line-height:1.55;margin:12px 0 0}
  .w .feat{padding:20px;border-radius:16px}
  .w .feat .ic{width:42px;height:42px;border-radius:12px;background:var(--blue-soft);border:1px solid var(--blue-line);color:var(--blue-dk);display:grid;place-items:center;margin-bottom:12px}
  .w .feat h3{font-size:16px}
  .w .feat p{color:var(--ink-3);font-size:13.5px;line-height:1.55;margin:7px 0 0}
  .w .band{position:relative;overflow:hidden;border-radius:26px;padding:50px 40px;color:#fff;text-align:center;background:radial-gradient(120% 140% at 50% 0%,#12325e,#0B1B33 60%,#081226);box-shadow:var(--sh-3)}
  .w .band h2{font-size:clamp(24px,3vw,34px);color:#fff}
  .w .band p{color:rgba(255,255,255,.72);max-width:52ch;margin:14px auto 24px;font-size:15.5px;line-height:1.55}
  .w .ft{border-top:1px solid var(--hair);background:var(--bg-2);padding:34px 0;margin-top:16px}
  .w .ft-in{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;color:var(--ink-3);font-size:13px}

  /* course detail */
  .w .detail{display:grid;grid-template-columns:1fr 330px;gap:30px;align-items:start}
  .w .session{display:flex;align-items:center;gap:14px;padding:15px;border-radius:14px;border:1px solid var(--hair);background:var(--card);box-shadow:var(--sh-1);margin-bottom:11px}
  .w .session .when{width:50px;text-align:center;flex:none}
  .w .session .when .d{font-size:19px;font-weight:800;line-height:1}
  .w .session .when .m{font-size:10.5px;color:var(--ink-3);text-transform:uppercase;font-weight:700}
  .w .session .info{flex:1}.w .session .info h4{font-size:14.5px;font-weight:700}
  .w .session .info p{margin:3px 0 0;font-size:12.5px;color:var(--ink-3)}

  /* ===== CLASSROOM ===== */
  .w .room{position:relative;z-index:1;height:100vh;min-height:640px;display:grid;grid-template-rows:1fr;background:var(--bg-2)}
  .w[data-theme="dark"] .room{background:#070d18}
  .w .room-top{display:flex;align-items:center;gap:12px;padding:11px 18px;border-bottom:1px solid var(--hair);background:var(--card)}
  .w .room-top .tt{font-weight:800;font-size:14.5px}
  .w .room-top .sub{color:var(--ink-3);font-size:12px}
  .w .metric{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--ink-2);font-weight:600;font-variant-numeric:tabular-nums}
  .w .rec{display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:700;color:var(--red);background:var(--red-bg);border:1px solid var(--red-line);padding:5px 10px;border-radius:8px}
  .w .rec .dot{width:8px;height:8px;border-radius:50%;background:var(--red-line);animation:wPulse 1.4s infinite}
  .w .sel{display:inline-flex;align-items:center;gap:8px;background:var(--card);border:1px solid var(--hair);border-radius:10px;padding:8px 12px;font-size:13px;font-weight:700;color:var(--ink);cursor:pointer;box-shadow:var(--sh-1)}
  .w .sel:hover{border-color:var(--blue-line)}
  .w .room-body{display:grid;grid-template-columns:1fr 322px;gap:14px;padding:14px;min-height:0}
  .w .stage{display:grid;grid-template-rows:1fr auto;gap:12px;min-height:0}
  .w .stage-main{position:relative;border-radius:16px;overflow:hidden;box-shadow:var(--sh-2);border:1px solid var(--hair);background:radial-gradient(130% 90% at 25% 15%,rgba(109,94,246,.4),transparent 55%),radial-gradient(120% 90% at 85% 95%,rgba(3,133,255,.45),transparent 60%),linear-gradient(160deg,#0B1B33,#0A1322);display:grid;place-items:center}
  .w .stage-main .prof-av{width:118px;height:118px;border-radius:50%;background:linear-gradient(140deg,#2b3f63,#0d1a30);border:3px solid rgba(255,255,255,.16);display:grid;place-items:center;color:#cfe0f5;font-size:38px;font-weight:800;box-shadow:var(--sh-2)}
  .w .name-tag{position:absolute;left:12px;bottom:12px;display:flex;align-items:center;gap:8px;background:rgba(6,12,24,.62);backdrop-filter:blur(8px);color:#fff;font-size:13px;font-weight:700;padding:7px 11px;border-radius:9px}
  .w .stage-main .live{position:absolute;left:12px;top:12px}
  .w .stage-main .spot{position:absolute;right:12px;top:12px}
  .w .glass{background:rgba(6,12,24,.6);backdrop-filter:blur(8px);color:#fff;font-size:12px;font-weight:700;padding:6px 10px;border-radius:8px;display:inline-flex;align-items:center;gap:7px}
  .w .filmstrip{display:flex;gap:10px;overflow-x:auto;padding:2px}
  .w .tile{flex:none;width:150px;aspect-ratio:16/10;border-radius:12px;overflow:hidden;position:relative;border:1px solid var(--hair);box-shadow:var(--sh-1);background:linear-gradient(150deg,#1a2c49,#101e36);display:grid;place-items:center;cursor:pointer;transition:.2s}
  .w .tile:hover{border-color:var(--blue-line);transform:translateY(-2px)}
  .w .tile.cam-off{background:var(--bg-3)}
  .w .tile .sm-av{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;font-weight:800;font-size:15px;color:#fff}
  .w .tile .nm{position:absolute;left:7px;bottom:6px;font-size:11px;font-weight:700;color:#fff;background:rgba(6,12,24,.6);padding:3px 7px;border-radius:6px;max-width:82%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .w .tile .hand{position:absolute;right:6px;top:6px;width:22px;height:22px;border-radius:6px;background:var(--amber-bg);border:1px solid var(--amber-line);display:grid;place-items:center;font-size:12px}
  .w .tile .mutei{position:absolute;right:6px;bottom:6px;width:20px;height:20px;border-radius:5px;background:rgba(194,52,43,.9);display:grid;place-items:center;font-size:10px}
  .w .panel{display:flex;flex-direction:column;min-height:0;border-radius:16px;border:1px solid var(--hair);background:var(--card);box-shadow:var(--sh-1);overflow:hidden}
  .w .ptabs{display:flex;border-bottom:1px solid var(--hair);flex:none}
  .w .ptab{flex:1;padding:11px;font-size:12.5px;font-weight:700;color:var(--ink-3);text-align:center;cursor:pointer;border-bottom:2px solid transparent}
  .w .ptab.on{color:var(--blue-dk);border-bottom-color:var(--blue)}
  .w .pbody{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:12px}
  .w .msg .who{font-size:12px;font-weight:800;color:var(--ink)}
  .w .msg .who .role{font-weight:700;font-size:10px;color:var(--blue-dk);background:var(--blue-soft);border:1px solid var(--blue-line);padding:1px 6px;border-radius:50px;margin-left:6px}
  .w .msg .tx{font-size:13px;color:var(--ink-2);line-height:1.45;margin-top:2px}
  .w .pfoot{flex:none;border-top:1px solid var(--hair);padding:10px;display:flex;gap:8px}
  .w .pfoot input{flex:1;border:1px solid var(--hair);background:var(--bg-2);border-radius:10px;padding:10px 12px;font-size:13px;color:var(--ink);outline:none;font-family:inherit}
  .w .pfoot input:focus{border-color:var(--blue-line);box-shadow:0 0 0 3px var(--blue-soft)}
  .w .prow{display:flex;align-items:center;gap:10px}
  .w .prow .av{width:32px;height:32px;font-size:13px}
  .w .prow .pn{flex:1;font-size:13px;font-weight:600}
  .w .prow .pn small{display:block;color:var(--ink-3);font-weight:500;font-size:11px}
  .w .mini{width:28px;height:28px;border-radius:8px;border:1px solid var(--hair);background:var(--bg-2);display:grid;place-items:center;cursor:pointer;color:var(--ink-2);transition:.15s;font-size:12px}
  .w .mini:hover{border-color:var(--blue-line);color:var(--blue-dk)}
  .w .mini.warn:hover{border-color:var(--amber-line);color:var(--amber)}
  .w .controls{display:flex;align-items:center;justify-content:center;gap:9px;padding:12px;border-top:1px solid var(--hair);background:var(--card);flex-wrap:wrap}
  .w .ctrl{width:46px;height:46px;border-radius:13px;border:1px solid var(--hair);background:var(--bg-2);display:grid;place-items:center;cursor:pointer;color:var(--ink);transition:.18s;position:relative;font-size:17px}
  .w .ctrl:hover{transform:translateY(-2px);border-color:var(--blue-line);color:var(--blue-dk)}
  .w .ctrl.active{background:var(--blue);color:#fff;border-color:transparent;box-shadow:var(--sh-blue)}
  .w .ctrl.off{background:var(--red-bg);color:var(--red);border-color:var(--red-line)}
  .w .ctrl .lbl{position:absolute;bottom:-17px;font-size:9.5px;font-weight:700;color:var(--ink-3);white-space:nowrap}
  .w .cdiv{width:1px;height:32px;background:var(--hair);margin:0 3px}
  .w .end{display:inline-flex;align-items:center;gap:8px;background:var(--red-line);color:#fff;font-weight:800;font-size:14px;border-radius:13px;padding:0 18px;height:46px;cursor:pointer;border:none;font-family:inherit}

  /* replay */
  .w .replay{display:grid;grid-template-columns:1fr 330px;gap:24px;align-items:start;padding:26px 0}
  .w .player{border-radius:18px;overflow:hidden;box-shadow:var(--sh-2);border:1px solid var(--hair)}
  .w .player .screen{aspect-ratio:16/9;position:relative;display:grid;place-items:center;background:radial-gradient(130% 90% at 30% 20%,rgba(3,133,255,.4),transparent 58%),linear-gradient(160deg,#0B1B33,#0A1322)}
  .w .player .play{width:72px;height:72px;border-radius:50%;background:rgba(255,255,255,.95);display:grid;place-items:center;color:var(--blue-dk);box-shadow:var(--sh-3);cursor:pointer;transition:.2s;font-size:22px}
  .w .player .play:hover{transform:scale(1.06)}
  .w .player .recorded{position:absolute;left:14px;top:14px;background:rgba(6,12,24,.62);backdrop-filter:blur(8px);color:#fff;font-size:11px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;padding:5px 10px;border-radius:7px}
  .w .scrub{padding:14px 16px;background:var(--card)}
  .w .bar{height:6px;border-radius:50px;background:var(--bg-3);position:relative;cursor:pointer}
  .w .bar .fill{position:absolute;left:0;top:0;bottom:0;width:38%;background:var(--blue);border-radius:50px}
  .w .bar .knob{position:absolute;left:38%;top:50%;transform:translate(-50%,-50%);width:15px;height:15px;border-radius:50%;background:var(--blue);border:3px solid var(--card);box-shadow:var(--sh-2)}
  .w .scrub .trow{display:flex;justify-content:space-between;margin-top:9px;color:var(--ink-3);font-size:12px;font-variant-numeric:tabular-nums}

  /* mock nav */
  .w .mocknav{position:fixed;top:14px;left:14px;z-index:200;background:rgba(11,27,51,.9);backdrop-filter:blur(14px);border:1px solid rgba(255,255,255,.12);border-radius:14px;padding:10px;box-shadow:var(--sh-3);width:180px;max-height:calc(100vh - 28px);overflow:auto}
  .w .mocknav .mh{display:flex;align-items:center;justify-content:space-between;color:#fff;font-weight:800;font-size:12px;letter-spacing:.04em;padding:2px 4px 8px}
  .w .mocknav .mg{color:rgba(255,255,255,.4);font-size:9.5px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;padding:8px 4px 3px}
  .w .mocknav button{display:block;width:100%;text-align:left;border:none;background:transparent;color:rgba(255,255,255,.72);font-weight:600;font-size:12.5px;padding:6px 8px;border-radius:8px;cursor:pointer;font-family:inherit;transition:.15s}
  .w .mocknav button:hover{color:#fff;background:rgba(255,255,255,.08)}
  .w .mocknav button.on{background:var(--blue);color:#fff}
  .w .mocknav .tgl{border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.1);color:#fff;width:26px;height:26px;border-radius:8px;cursor:pointer;display:grid;place-items:center}
  .w .mn-collapsed{width:auto}.w .mn-collapsed .mn-body{display:none}

  @media(max-width:1080px){
    .w .shell{grid-template-columns:1fr}.w .side{display:none}
    .w .g4{grid-template-columns:1fr 1fr}.w .g3{grid-template-columns:1fr}
    .w .hero,.w .detail,.w .replay,.w .auth,.w .setup-card{grid-template-columns:1fr}
    .w .self-preview{min-height:220px}
    .w .cal{font-size:10px}
  }
  /* role picker reflects the checked radio (SSR form, no JS) */
  .w .role-opt:has(input:checked){border-color:var(--blue);background:var(--blue-soft);box-shadow:0 0 0 3px var(--blue-soft)}
  .w .role-opt input{position:absolute;opacity:0;pointer-events:none}
  /* quality radio (setup page) reflects selection without JS */
  .w .qopt input{position:absolute;opacity:0;pointer-events:none}
  .w .qopt:has(input:checked){border-color:var(--blue);background:var(--blue-soft);color:var(--blue-dk)}

  /* ===== Classroom video engine (grid + speaker view) ===== */
  .w #lk-stage{position:relative;flex:1;min-height:0;border-radius:16px;overflow:hidden;box-shadow:var(--sh-2);border:1px solid var(--hair);padding:10px;display:flex;flex-direction:column;gap:10px;background:radial-gradient(130% 90% at 25% 15%,rgba(109,94,246,.25),transparent 55%),radial-gradient(120% 90% at 85% 95%,rgba(3,133,255,.3),transparent 60%),linear-gradient(160deg,#0B1B33,#0A1322)}
  .w #lk-spotlight{flex:1;min-height:0;display:none;position:relative}
  .w #lk-spotlight video{width:100%;height:100%;border-radius:12px}
  .w .spot-avatar{position:absolute;inset:0;margin:auto;width:120px;height:120px;border-radius:50%;display:none;place-items:center;font-weight:800;font-size:38px;color:#cfe0f5;background:linear-gradient(140deg,#2b3f63,#0d1a30);border:2px solid rgba(255,255,255,.14)}
  .w .spot-label{position:absolute;left:12px;bottom:12px;font-size:13px;font-weight:800;color:#fff;background:rgba(6,12,24,.6);backdrop-filter:blur(6px);padding:6px 11px;border-radius:9px;z-index:2}
  .w .vtile.is-host{outline:2px solid rgba(109,94,246,.7);outline-offset:-2px}
  .w #lk-tiles{flex:1;min-height:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:10px;align-content:center;overflow:auto}
  .w #lk-stage.speaker #lk-tiles{flex:none;display:flex;grid-template-columns:none;height:96px;overflow-x:auto;overflow-y:hidden;align-content:start}
  .w #lk-stage.speaker #lk-tiles .vtile{flex:none;width:150px;height:100%;aspect-ratio:auto}
  .w .vtile{position:relative;border-radius:12px;overflow:hidden;background:linear-gradient(150deg,#1a2c49,#101e36);border:1px solid rgba(255,255,255,.08);aspect-ratio:16/9;min-height:0;display:grid;place-items:center}
  .w .vtile video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
  .w .vtile.speaking{outline:3px solid var(--green-line);outline-offset:-3px;box-shadow:0 0 0 4px rgba(22,163,74,.25)}
  .w .vavatar{width:64px;height:64px;border-radius:50%;display:grid;place-items:center;font-weight:800;font-size:22px;color:#cfe0f5;background:linear-gradient(140deg,#2b3f63,#0d1a30);border:2px solid rgba(255,255,255,.14)}
  .w .vlabel{position:absolute;left:8px;bottom:7px;display:flex;align-items:center;gap:6px;max-width:88%;font-size:11.5px;font-weight:700;color:#fff;background:rgba(6,12,24,.6);backdrop-filter:blur(6px);padding:4px 8px;border-radius:7px}
  .w .vlabel .vname{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .w .vmic.muted{color:#fca5a5}
  .w .vpin{position:absolute;right:7px;top:7px;width:26px;height:26px;border-radius:7px;border:none;background:rgba(6,12,24,.55);backdrop-filter:blur(6px);color:#fff;cursor:pointer;opacity:0;transition:.15s;font-size:13px}
  .w .vtile:hover .vpin{opacity:1}
  .w .vpin:hover{background:var(--blue)}
  .w .vtile.hand::after{content:"✋";position:absolute;left:8px;top:7px;background:var(--amber-bg);border:1px solid var(--amber-line);border-radius:7px;padding:2px 5px;font-size:12px}
  .w .vquality{position:absolute;right:8px;bottom:9px;display:flex;align-items:flex-end;gap:2px;height:12px;opacity:.85}
  .w .vquality i{width:3px;background:#fff;border-radius:1px;height:4px}
  .w .vquality i:nth-child(2){height:8px}.w .vquality i:nth-child(3){height:12px}
  .w .vtile[data-q="poor"] .vquality i{background:#fca5a5}
  .w .vtile[data-q="poor"] .vquality i:nth-child(2),.w .vtile[data-q="poor"] .vquality i:nth-child(3){opacity:.3}
  .w .placeholder-empty{position:absolute;inset:0;display:grid;place-items:center;color:rgba(255,255,255,.6);font-size:13px}

  /* floating emoji reactions */
  .w #lk-reactions{position:absolute;inset:0;pointer-events:none;overflow:hidden;z-index:5}
  .w .reaction{position:absolute;bottom:8px;font-size:30px;animation:wReactUp 3.1s ease-out forwards}
  @keyframes wReactUp{0%{transform:translateY(0) scale(.5);opacity:0}12%{opacity:1;transform:translateY(-20px) scale(1.15)}100%{transform:translateY(-70vh) scale(1);opacity:0}}

  /* reactions popover on the control bar */
  .w .react-pop{position:relative}
  .w .react-menu{position:absolute;bottom:56px;left:50%;transform:translateX(-50%);display:none;gap:4px;background:var(--card);border:1px solid var(--hair);border-radius:50px;padding:6px 8px;box-shadow:var(--sh-3);z-index:20}
  .w .react-pop:hover .react-menu{display:flex}
  .w .react-menu button{border:none;background:transparent;font-size:20px;cursor:pointer;padding:3px;border-radius:8px;transition:.12s}
  .w .react-menu button:hover{transform:scale(1.25);background:var(--bg-2)}

  /* ===== Classroom overlay UI (banner + floating dock + settings) ===== */
  .w #lk-stage{padding:58px 12px 76px 12px}
  .w .ov-banner{position:absolute;top:0;left:0;right:0;z-index:6;display:flex;align-items:center;gap:12px;padding:14px 16px 26px;color:#fff;background:linear-gradient(180deg,rgba(8,14,26,.78) 0%,rgba(8,14,26,.35) 55%,transparent 100%);pointer-events:none}
  .w .ov-banner>*{pointer-events:auto}
  .w .ov-title{min-width:0}
  .w .ov-title .ov-t{font-weight:800;font-size:15px;letter-spacing:-.01em;line-height:1.1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .w .ov-title .ov-s{font-size:12px;color:rgba(255,255,255,.72);margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .w .ov-spacer{flex:1}
  .w .ov-metric{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:rgba(255,255,255,.9);font-variant-numeric:tabular-nums;background:rgba(255,255,255,.12);backdrop-filter:blur(8px);padding:6px 11px;border-radius:50px}
  .w .ov-rec{display:inline-flex;align-items:center;gap:7px;font-size:11.5px;font-weight:800;letter-spacing:.05em;color:#fff;background:rgba(239,68,68,.28);border:1px solid rgba(239,68,68,.5);backdrop-filter:blur(8px);padding:5px 10px;border-radius:50px}
  .w .ov-rec .dot{width:7px;height:7px;border-radius:50%;background:#fff;animation:wPulse 1.4s infinite}
  .w .ov-menu{position:relative}
  .w .ov-menu summary{list-style:none;width:40px;height:40px;border-radius:50%;background:rgba(255,255,255,.14);backdrop-filter:blur(8px);display:grid;place-items:center;cursor:pointer;font-size:17px;transition:.15s}
  .w .ov-menu summary::-webkit-details-marker{display:none}
  .w .ov-menu summary:hover,.w .ov-menu[open] summary{background:rgba(255,255,255,.26)}
  .w .ov-menu-list{position:absolute;right:0;top:calc(100% + 10px);min-width:220px;background:var(--card);border:1px solid var(--hair);border-radius:14px;box-shadow:var(--sh-3);padding:6px;display:flex;flex-direction:column;gap:2px;z-index:20}
  .w .ov-menu-list button{display:flex;align-items:center;gap:10px;width:100%;text-align:left;border:none;background:transparent;color:var(--ink);font-family:inherit;font-size:13.5px;font-weight:600;padding:10px 12px;border-radius:10px;cursor:pointer}
  .w .ov-menu-list button:hover{background:var(--bg-2);color:var(--blue-dk)}
  .w .ov-menu-list button span{width:18px;text-align:center}

  .w .ov-dock{position:absolute;bottom:16px;left:50%;transform:translateX(-50%);z-index:7;display:flex;align-items:center;gap:8px;background:rgba(11,27,51,.5);backdrop-filter:blur(18px) saturate(150%);border:1px solid rgba(255,255,255,.14);border-radius:50px;padding:8px 10px;box-shadow:0 12px 36px rgba(0,0,0,.42)}
  .w .ov-btn{width:48px;height:48px;border-radius:50%;border:none;background:rgba(255,255,255,.13);color:#fff;font-size:19px;cursor:pointer;display:grid;place-items:center;transition:transform .15s,background .15s;position:relative;text-decoration:none}
  .w .ov-btn:hover{background:rgba(255,255,255,.24);transform:translateY(-2px)}
  .w .ov-btn.off{background:var(--red-line)}
  .w .ov-btn.ov-danger{background:var(--red-line)}
  .w .ov-btn.ov-danger:hover{background:#b02a22}
  .w .ov-status{position:absolute;bottom:80px;left:50%;transform:translateX(-50%);z-index:6;display:none;color:#fff;font-size:12.5px;font-weight:600;background:rgba(6,12,24,.62);backdrop-filter:blur(8px);padding:7px 13px;border-radius:50px}
  .w .ov-dock .react-menu{bottom:60px}
  /* Auto-hide: banner + dock fade away when the pointer is idle, revealing full video. */
  .w .ov-banner,.w .ov-dock{transition:opacity .3s ease,transform .3s ease}
  .w #lk-stage.idle{cursor:none}
  .w #lk-stage.idle .ov-banner{opacity:0;transform:translateY(-8px);pointer-events:none}
  .w #lk-stage.idle .ov-dock{opacity:0;transform:translateX(-50%) translateY(12px);pointer-events:none}

  /* Chat/people DOCKED next to the video on desktop (always visible with live people/chat) */
  .w .room-body{position:relative;display:grid;grid-template-columns:1fr 340px;gap:14px;padding:14px;height:100%;min-height:0}
  .w .room-body .stage{min-width:0;height:100%}
  .w .room-body .panel{min-height:0;display:flex}
  .w .panel-close{display:none;margin-left:auto;align-self:center;width:30px;height:30px;border:none;background:transparent;color:var(--ink-3);cursor:pointer;font-size:14px;border-radius:8px;margin-right:8px}
  .w .panel-close:hover{background:var(--bg-2);color:var(--ink)}

  /* ===== Responsive video: full frame + student carousel + mobile ===== */
  /* Spotlight shows the whole frame (never crops a mobile portrait / screenshare feed) */
  .w #lk-spotlight video{object-fit:contain;background:#05080f}
  /* Participant carousel in regular (speaker) view — centered, professor in the middle */
  .w #lk-stage.speaker #lk-tiles{gap:8px;scrollbar-width:thin;scroll-snap-type:x proximity;justify-content:safe center}
  .w #lk-stage.speaker #lk-tiles .vtile{width:168px;scroll-snap-align:center}

  @media(max-width:820px){
    .w #lk-stage{padding:50px 8px 84px 8px}
    .w .ov-banner{padding:10px 12px 22px;gap:8px}
    .w .ov-title .ov-t{font-size:13.5px}
    .w .ov-title .ov-s{font-size:11px}
    .w .ov-metric{padding:5px 9px;font-size:12px}
    .w .ov-menu summary{width:36px;height:36px;font-size:15px}
    .w .ov-dock{gap:5px;padding:6px;bottom:10px;max-width:94vw;flex-wrap:wrap;justify-content:center;border-radius:22px}
    .w .ov-btn{width:44px;height:44px;font-size:18px}
    .w #lk-stage.speaker #lk-tiles{height:82px}
    .w #lk-stage.speaker #lk-tiles .vtile{width:128px}
    .w #lk-tiles{grid-template-columns:repeat(auto-fit,minmax(min(100%,150px),1fr))}
    .w .room-body{display:block;padding:8px}
    .w .room-body .panel{position:absolute;top:0;right:0;bottom:0;width:340px;max-width:100%;transform:translateX(calc(100% + 24px));transition:transform .28s cubic-bezier(.2,.7,.2,1);z-index:9;box-shadow:var(--sh-3);border-radius:0}
    .w .room-body .panel.open{transform:none !important}
    .w .panel-close{display:block}
  }

  /* ===== App shell mobile nav (hamburger + drawer) ===== */
  .w .mnav-btn{display:none}
  .w .side-backdrop{display:none}
  @media(max-width:1080px){
    .w .mnav-btn{display:grid;place-items:center;width:40px;height:40px;border-radius:10px;border:1px solid var(--hair);background:var(--card);color:var(--ink);font-size:18px;cursor:pointer;box-shadow:var(--sh-1);flex:none}
    .w .shell .side{display:flex!important;position:fixed;left:0;top:0;bottom:0;width:264px;max-width:82vw;transform:translateX(-100%);transition:transform .26s cubic-bezier(.2,.7,.2,1);z-index:60;box-shadow:var(--sh-3);height:100vh}
    .w .shell .side.open{transform:none}
    .w .side-backdrop{display:block;position:fixed;inset:0;background:rgba(6,12,24,.5);opacity:0;pointer-events:none;transition:opacity .26s;z-index:55}
    .w .side-backdrop.show{opacity:1;pointer-events:auto}
  }
  /* Small-phone niceties across the app */
  @media(max-width:560px){
    .w .topbar{padding:12px 16px;gap:10px}
    .w .topbar h1{font-size:17px}
    .w .content{padding:16px}
    .w .search{min-width:0;flex:1}
    .w .g4,.w .g3,.w .g2{grid-template-columns:1fr}
    .w .wrap{padding:0 16px}
    .w .auth{grid-template-columns:1fr}
    .w .auth-brand{display:none}
  }