/* Layout: a demo switcher on top, then one course column — sale page, student room, Rina's admin window — in her cream, brown and gold */
:root{
  --bg:#F6F0E7; --surface:#FFFCF7; --sunk:#EEE3D4; --ink:#33251B; --muted:#6B5546; --line:#E2D2BE;
  --brown:#4A3326; --on-brown:#FBF6EF; --caramel:#8E5F3A; --gold:#B08D57; --gold-soft:#EADBBE;
  --ok:#3E6B45; --ok-bg:#E3EEE1; --warn:#7A4A1E; --warn-bg:#F6E5CC; --danger:#9C3424; --danger-bg:#F7E1DB;
  --player:#1E1611; --on-player:#F6EFE6; --shadow:rgba(51,37,27,.14); --img-filter:none;
  --display:'Frank Ruhl Libre',Georgia,'Times New Roman',serif;
  --body:'Rubik','Segoe UI',system-ui,-apple-system,Arial,sans-serif;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){--bg:#1A1410;--surface:#231B15;--sunk:#2D231C;--ink:#F2E8DC;--muted:#C4B09C;--line:#3F3229;--brown:#E8C9A1;--on-brown:#2A1D15;--caramel:#DDAE80;--gold:#D6B67E;--gold-soft:#4A3B27;--ok:#9FD3A8;--ok-bg:#20342A;--warn:#F2C994;--warn-bg:#3E2D1B;--danger:#F3A091;--danger-bg:#46231C;--player:#0F0B08;--on-player:#F2E8DC;--shadow:rgba(0,0,0,.45);--img-filter:brightness(.86) contrast(1.04);color-scheme:dark}
}
:root[data-theme="dark"]{--bg:#1A1410;--surface:#231B15;--sunk:#2D231C;--ink:#F2E8DC;--muted:#C4B09C;--line:#3F3229;--brown:#E8C9A1;--on-brown:#2A1D15;--caramel:#DDAE80;--gold:#D6B67E;--gold-soft:#4A3B27;--ok:#9FD3A8;--ok-bg:#20342A;--warn:#F2C994;--warn-bg:#3E2D1B;--danger:#F3A091;--danger-bg:#46231C;--player:#0F0B08;--on-player:#F2E8DC;--shadow:rgba(0,0,0,.45);--img-filter:brightness(.86) contrast(1.04);color-scheme:dark}
*{box-sizing:border-box}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:16px;line-height:1.55;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));padding-block:0 56px}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--surface)}
h1,h2,h3{font-family:var(--display);font-weight:700;line-height:1.18;margin:0;text-wrap:balance}
p{margin:0}
a{color:var(--caramel)}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--caramel);outline-offset:3px;border-radius:8px}
.num{font-variant-numeric:tabular-nums}
.ic{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;flex:none}

#view{max-width:980px;margin:0 auto;padding-top:22px;display:flex;flex-direction:column;gap:30px}
.muted{color:var(--muted)}
.lead{font-size:17px;color:var(--muted);max-width:62ch}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:0 24px;border-radius:26px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font-weight:500;text-decoration:none;cursor:pointer;text-align:center}
.btn-main{background:var(--brown);border-color:var(--brown);color:var(--on-brown)}
.btn-gold{background:var(--gold);border-color:var(--gold);color:#22180F}
.btn-sm{min-height:42px;padding:0 16px;font-size:14px}
.btn-danger{color:var(--danger);border-color:var(--danger)}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.card{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:18px}
.toast{position:fixed;inset-inline:0;bottom:calc(18px + env(safe-area-inset-bottom,0px));display:flex;justify-content:center;z-index:40;pointer-events:none;padding-inline:16px}
.toast span{background:var(--brown);color:var(--on-brown);padding:11px 16px;border-radius:14px;font-size:15px;max-width:520px;box-shadow:0 8px 24px var(--shadow)}

/* sale hero */
.hero{display:grid;grid-template-columns:minmax(0,1fr);gap:22px;align-items:center}
.hero-img{position:relative;padding:8px;border-radius:26px;background:var(--surface);border:1px solid var(--gold);box-shadow:0 18px 44px var(--shadow)}
.hero-img img{display:block;width:100%;max-width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:19px;filter:var(--img-filter);background:var(--sunk)}
.hero-img .chip{position:absolute;inset-inline-start:22px;bottom:22px;background:rgba(251,246,236,.92);color:#4A3326;border:1px solid #B08D57;border-radius:12px;padding:6px 12px;font-size:11px;letter-spacing:.24em;font-weight:600;direction:ltr}
.gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.gallery figure{margin:0;display:flex;flex-direction:column;gap:6px}
.gallery img{display:block;width:100%;max-width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:16px;border:1px solid var(--line);filter:var(--img-filter);background:var(--sunk)}
.gallery figcaption{font-size:13px;color:var(--muted)}
.teacher{display:grid;grid-template-columns:minmax(0,1fr);gap:18px;align-items:center}
.teacher img{display:block;width:100%;max-width:340px;aspect-ratio:1/1;object-fit:cover;border-radius:50%;border:3px solid var(--gold);padding:6px;background:var(--surface);filter:var(--img-filter)}
.fv img{width:72px;height:72px;border-radius:14px;object-fit:cover;flex:none;filter:var(--img-filter)}
.fv .thumb{position:relative;display:block}
.fv .thumb .pl{position:absolute;inset:0;margin:auto;width:34px;height:34px}
.fv .thumb .pl svg{width:14px;height:14px}
.eyebrow{font-size:12px;letter-spacing:.2em;color:var(--caramel);font-weight:600;direction:ltr;unicode-bidi:isolate}
.hero h1{font-size:clamp(36px,8vw,58px);font-weight:900;margin-top:6px}
.stats{display:flex;flex-wrap:wrap;gap:4px 0;font-size:15px;margin-top:12px}
.stats span+span::before{content:"·";color:var(--gold);padding-inline:10px}
.buy{display:flex;flex-direction:column;gap:10px;margin-top:18px}
.price{font-family:var(--display);font-size:34px;font-weight:700}
.price small{font-family:var(--body);font-size:14px;font-weight:400;color:var(--muted);margin-inline-start:8px}
.wa{font-size:14px;color:var(--muted)}
.wa b{direction:ltr;unicode-bidi:isolate;user-select:all;color:var(--ink)}
.steps3{display:grid;grid-template-columns:minmax(0,1fr);gap:12px;list-style:none;margin:0;padding:0;counter-reset:st}
.steps3 li{counter-increment:st;display:grid;grid-template-columns:44px minmax(0,1fr);gap:12px;align-items:start;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:14px}
.steps3 li::before{content:counter(st);font-family:var(--display);font-size:30px;font-weight:700;color:var(--caramel);line-height:1;text-align:center}
.steps3 b{display:block;margin-bottom:2px}
.sect{display:flex;flex-direction:column;gap:14px}
.sect h2{font-size:clamp(26px,5vw,32px)}
.twocol{display:grid;grid-template-columns:minmax(0,1fr);gap:14px}
.bul{margin:0;padding-inline-start:20px;display:flex;flex-direction:column;gap:6px}
.bul li::marker{color:var(--gold)}
.free{display:grid;grid-template-columns:minmax(0,1fr);gap:12px}
.fv{display:grid;grid-template-columns:auto minmax(0,1fr);gap:14px;align-items:center;padding:14px;border-radius:16px;border:1px solid var(--ok);background:var(--ok-bg);text-decoration:none;color:var(--ink)}
.fv .pl{width:52px;height:52px;border-radius:50%;background:var(--brown);color:var(--on-brown);display:flex;align-items:center;justify-content:center}
.fv .pl svg{width:20px;height:20px;fill:currentColor}
.fv b{display:block}
.fv small{color:var(--muted);font-size:13px}

/* program */
.chap{border-top:1px solid var(--line)}
.chap:last-child{border-bottom:1px solid var(--line)}
.chap-head{width:100%;display:flex;align-items:center;gap:14px;padding:16px 2px;border:0;background:none;cursor:pointer;text-align:start}
.chap-no{flex:none;width:40px;font-family:var(--display);font-size:28px;font-weight:700;color:var(--caramel);text-align:center;line-height:1}
.chap-t{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}
.chap-t strong{font-family:var(--display);font-size:20px;line-height:1.25}
.chap-t small{color:var(--muted);font-size:13px}
.chev{width:22px;height:22px;flex:none;stroke:var(--muted);fill:none;stroke-width:1.8;transition:transform .2s}
.chap-head[aria-expanded="true"] .chev{transform:rotate(180deg)}
.chap-body{padding:0 0 16px;display:flex;flex-direction:column;gap:8px}
.chap-img{display:block;width:100%;max-width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:14px;border:1px solid var(--line);filter:var(--img-filter);background:var(--sunk)}
.les{display:flex;align-items:center;gap:12px;min-height:54px;padding:6px 8px;border-radius:12px;width:100%;border:0;background:none;cursor:pointer;text-align:start}
.les:hover{background:var(--sunk)}
.bead{flex:none;width:30px;height:30px;border-radius:50%;border:2px solid var(--caramel);display:flex;align-items:center;justify-content:center;color:var(--caramel);font-size:12px;font-weight:600}
.bead.done{background:var(--caramel);color:var(--bg)}
.bead.lock{border-color:var(--line);color:var(--muted)}
.bead svg{width:15px;height:15px;stroke:currentColor;fill:none;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.lt{flex:1;min-width:0;font-size:15px;line-height:1.35}
.tag{flex:none;font-size:12px;padding:2px 9px;border-radius:9px;background:var(--ok-bg);color:var(--ok);font-weight:600}
.tag.lock{background:var(--sunk);color:var(--muted);font-weight:500}
.dur{flex:none;font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums;direction:ltr}
.panel{margin:4px 0 8px;display:flex;flex-direction:column;gap:10px}
.player{position:relative;border-radius:16px;overflow:hidden;background:var(--player);aspect-ratio:16/9;max-width:100%;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:10px;color:var(--on-player);text-align:center;padding:16px}
.player .big{width:64px;height:64px;border-radius:50%;background:var(--brown);display:flex;align-items:center;justify-content:center}
.player .big svg{width:26px;height:26px;fill:var(--on-brown)}
.wm{position:absolute;inset-inline-end:12px;top:10px;font-size:12px;opacity:.7;direction:ltr}

/* student */
.banner{border-radius:18px;padding:16px 18px;display:flex;flex-direction:column;gap:8px}
.banner.wait{background:var(--warn-bg);color:var(--warn)}
.banner.ok{background:var(--ok-bg);color:var(--ok)}
.banner h2{font-size:24px}
.banner p{color:var(--ink)}
.who{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--muted)}
.who b{color:var(--ink)}
.bar{height:8px;border-radius:4px;background:var(--sunk);overflow:hidden}
.bar i{display:block;height:100%;background:var(--caramel);border-radius:4px}
.test{border:1px dashed var(--line);border-radius:16px;padding:14px;display:flex;flex-direction:column;gap:10px;background:var(--surface)}
.test .res{font-weight:600}
.test .res.no{color:var(--danger)}

/* certificate */
.cert{position:relative;background:#FBF6EC;color:#33251B;border-radius:12px;padding:30px 22px;text-align:center;border:2px solid #B08D57;outline:1px solid #B08D57;outline-offset:-10px;display:flex;flex-direction:column;align-items:center;gap:8px;box-shadow:0 14px 40px var(--shadow);max-width:640px;margin:0 auto;width:100%}
.cert img{width:72px;height:76px;object-fit:cover;border-radius:12px}
.cert .k{font-size:11px;letter-spacing:.3em;color:#8E5F3A;direction:ltr}
.cert h2{font-size:34px;font-weight:900}
.cert .name{font-family:var(--display);font-size:28px;border-bottom:1px solid #B08D57;padding:0 18px 4px}
.cert .course{font-family:var(--display);font-size:22px;font-weight:700}
.cert .foot{display:flex;gap:16px;flex-wrap:wrap;justify-content:center;font-size:12px;color:#6B5546}
.cert .note{font-size:12px;color:#6B5546}

/* admin (Russian, left-to-right) */
.admin{display:flex;flex-direction:column;gap:22px}
.admin h1{font-size:clamp(28px,6vw,36px)}
.kpis{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.kpi{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:14px}
.kpi b{display:block;font-family:var(--display);font-size:28px;font-variant-numeric:tabular-nums}
.kpi span{font-size:13px;color:var(--muted)}
.st{border:1px solid var(--line);border-radius:18px;background:var(--surface);padding:16px;display:flex;flex-direction:column;gap:12px}
.st.pending{border-color:var(--gold)}
.st-top{display:flex;flex-wrap:wrap;align-items:center;gap:6px 12px}
.st-top b{font-size:17px}
.pill{font-size:12px;padding:3px 10px;border-radius:10px;font-weight:600;white-space:nowrap}
.pill.wait{background:var(--warn-bg);color:var(--warn)}
.pill.ok{background:var(--ok-bg);color:var(--ok)}
.pill.off{background:var(--danger-bg);color:var(--danger)}
.kv{display:grid;grid-template-columns:minmax(0,1fr);gap:4px;font-size:14px;color:var(--muted)}
.kv span b{color:var(--ink);font-weight:500}
.grid2{display:grid;grid-template-columns:minmax(0,1fr);gap:10px}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:14px;font-weight:500}
input[type=text],input[type=number],input[type=date],select{width:100%;min-height:48px;border:1px solid var(--line);border-radius:12px;background:var(--bg);color:var(--ink);padding:0 12px;font:400 16px/1.4 var(--body)}
.confirm{border-radius:14px;background:var(--warn-bg);color:var(--ink);padding:14px;display:flex;flex-direction:column;gap:10px}
.shield{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.shield li{display:grid;grid-template-columns:22px minmax(0,1fr);gap:10px;align-items:start;font-size:15px}
.shield li::before{content:"✓";color:var(--ok);font-weight:700}
.shield li.warn::before{content:"!";color:var(--warn)}

@media (min-width:760px){
  .hero{grid-template-columns:minmax(0,1.1fr) minmax(0,1fr)}
  .steps3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .twocol{grid-template-columns:repeat(2,minmax(0,1fr))}
  .free{grid-template-columns:repeat(2,minmax(0,1fr))}
  .gallery{grid-template-columns:repeat(4,minmax(0,1fr))}
  .teacher{grid-template-columns:300px minmax(0,1fr)}
  .kpis{grid-template-columns:repeat(4,minmax(0,1fr))}
  .grid2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .kv{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* real app additions */
.topbar{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--surface);border-bottom:1px solid var(--line);margin-inline:calc(-1 * max(16px,env(safe-area-inset-left,0px)));padding:8px max(16px,env(safe-area-inset-right,0px)) 8px max(16px,env(safe-area-inset-left,0px));display:flex;align-items:center;gap:10px;min-height:60px}
.topbar .brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);flex:1;min-width:0}
.topbar .brand img{width:38px;height:40px;object-fit:cover;border-radius:10px}
.topbar .brand b{font-family:var(--display);font-size:18px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar a.btn,.topbar button.btn{min-height:40px;padding:0 14px;font-size:14px}
.form{display:flex;flex-direction:column;gap:12px;max-width:440px}
input[type=email],input[type=tel]{width:100%;min-height:50px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);padding:0 14px;font:400 16px/1.4 var(--body)}
.err{color:var(--danger);font-weight:500}
.okmsg{color:var(--ok);font-weight:500}
.player iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.center{max-width:520px;margin:20px auto 0;display:flex;flex-direction:column;gap:16px}