/* УРОК — записи рабочей сессии. Палитра и типографика УПОР */
:root{
  --ink:#0e1620; --dark:#141f2b; --paper:#f7f8fa; --paper2:#ebe9df;
  --gold:#3f7396; --green:#1d4f7a; --muted:#5d6861; --line:#d3d0c4; --red:#a63b35;
  --serif:Georgia,"Times New Roman",serif;
  --sans:"Helvetica Neue",Arial,sans-serif;
  --radius:14px;
  --shadow:0 10px 30px rgba(14,22,32,.10);
  --shadow-lg:0 24px 60px rgba(14,22,32,.22);
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.62 var(--sans);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{width:min(1120px,calc(100% - 40px));margin:auto}
.wrap-narrow{width:min(820px,calc(100% - 40px));margin:auto}

/* ---------- header ---------- */
.top{background:var(--dark);color:var(--paper)}
.top-in{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:72px;flex-wrap:wrap}
.brand{display:flex;align-items:baseline;gap:10px;font-family:var(--serif)}
.brand b{font-size:22px;letter-spacing:.06em;text-transform:uppercase}
.brand span{font-size:13px;color:#9fb0bd;letter-spacing:.04em}
.top nav{display:flex;gap:20px;font-size:15px;flex-wrap:wrap}
.top nav a{color:#cdd8e0;border-bottom:1px solid transparent;padding-bottom:2px}
.top nav a:hover{color:#fff;border-color:var(--gold)}

/* ---------- typography ---------- */
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;line-height:1.18;margin:0}
h1{font-size:clamp(30px,4.4vw,52px);letter-spacing:-.01em}
h2{font-size:clamp(24px,2.9vw,36px);margin-bottom:18px}
h3{font-size:clamp(19px,2.1vw,24px)}
p{margin:0 0 16px}
.lead{font-size:clamp(18px,2.1vw,22px);color:#26333f;max-width:76ch}
.kicker{font-size:13px;letter-spacing:.16em;text-transform:uppercase;color:var(--gold);margin-bottom:14px}
.muted{color:var(--muted)}
section{padding:64px 0;border-bottom:1px solid var(--line)}
section.dark{background:var(--dark);color:var(--paper);border-bottom:0}
section.dark .muted{color:#a9b7c2}
section.dark .kicker{color:#8fb6cf}
section.tint{background:var(--paper2)}

/* ---------- hero ---------- */
.hero{padding:72px 0 56px;background:linear-gradient(180deg,#fff 0%,var(--paper) 100%)}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center}
.hero-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.hero-card img{aspect-ratio:16/10;object-fit:cover;width:100%}
.hero-card figcaption{padding:14px 18px;font-size:14px;color:var(--muted)}
.meta-row{display:flex;gap:10px;flex-wrap:wrap;margin:24px 0 26px}
.chip{font-size:13px;padding:7px 13px;border:1px solid var(--line);border-radius:999px;background:#fff;color:#2c3a46}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:10px;padding:14px 24px;border-radius:999px;
  background:var(--green);color:#fff;font-size:16px;border:1px solid var(--green);cursor:pointer;transition:.18s}
.btn:hover{background:var(--ink);border-color:var(--ink)}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover{background:#fff;border-color:var(--ink)}
.btn-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:8px}

/* ---------- cards ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px;margin-top:26px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);color:var(--ink)}
.card h3{margin-bottom:10px}
.card p{color:#38424d;margin-bottom:12px}
.card .small{font-size:14px;color:var(--muted)}
.card-link{display:inline-block;margin-top:14px;color:var(--green);font-weight:600;border-bottom:1px solid rgba(29,79,122,.35)}
.num{font-family:var(--serif);font-size:15px;color:var(--gold);letter-spacing:.14em;text-transform:uppercase;margin-bottom:10px}

/* ---------- lesson / player ---------- */
.stage{position:relative;border-radius:var(--radius);overflow:hidden;background:#0b1119;box-shadow:var(--shadow-lg)}
.stage-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:blur(18px) saturate(.85) brightness(.55);transform:scale(1.12);transition:opacity .7s ease}
.stage-bg.b{opacity:0}
.stage-scrim{position:absolute;inset:0;background:radial-gradient(120% 90% at 50% 30%,rgba(11,17,25,.25) 0%,rgba(11,17,25,.82) 70%,rgba(11,17,25,.94) 100%)}
.stage-inner{position:relative;padding:26px clamp(14px,3.2vw,40px) 22px}
.stage-top{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;color:#e8eef3;margin-bottom:16px;flex-wrap:wrap}
.topic{max-width:min(640px,100%)}
.topic .t-label{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:#8fb6cf;margin-bottom:6px}
.topic .t-title{font-family:var(--serif);font-size:clamp(17px,2.2vw,24px);line-height:1.25}
.topic .t-mean{font-size:14.5px;color:#c3d0da;margin-top:6px}
.stage-clock{font-variant-numeric:tabular-nums;font-size:14px;color:#c3d0da;background:rgba(255,255,255,.08);padding:7px 12px;border-radius:999px;white-space:nowrap}

.video-shell{position:relative;background:#000;border-radius:10px;overflow:hidden;box-shadow:0 18px 46px rgba(0,0,0,.45)}
.video-shell video{width:100%;display:block;background:#000;aspect-ratio:16/10}
.badge-fr{position:absolute;top:12px;right:12px;background:rgba(11,17,25,.72);color:#dfe8ee;font-size:12px;padding:6px 11px;border-radius:999px;border:1px solid rgba(255,255,255,.16);backdrop-filter:blur(6px)}

/* субтитры: отдельная полоса под видео — не перекрывают ни видео, ни плашку темы */
.subs{margin-top:14px;background:rgba(6,10,15,.74);border:1px solid rgba(255,255,255,.12);border-radius:10px;
  padding:14px 18px;min-height:92px;display:flex;align-items:center;justify-content:center;text-align:center;backdrop-filter:blur(8px)}
.subs .cue{font-size:clamp(17px,2.3vw,25px);line-height:1.35;color:#f2f6f9;font-weight:500;letter-spacing:.005em}
.subs .cue .w{transition:color .12s linear}
.subs .cue .w.on{color:#9ed0f0}
.subs.off{opacity:.35}
.subs .cue .placeholder{color:#8ea0ad;font-weight:400;font-size:16px}

/* смысловой слой: что обсуждают в этой части */
.meaning-strip{margin-top:12px;display:flex;gap:12px;align-items:center;color:#c9d5de;font-size:14.5px;flex-wrap:wrap}
.meaning-strip .k{color:#8fb6cf;letter-spacing:.1em;text-transform:uppercase;font-size:11.5px}

/* controls */
.controls{margin-top:14px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.ctl{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);color:#eef4f8;border-radius:999px;
  padding:9px 15px;font-size:14px;cursor:pointer;transition:.16s}
.ctl:hover{background:rgba(255,255,255,.2)}
.ctl[aria-pressed="false"]{opacity:.55}
.scrub{position:relative;flex:1 1 320px;height:26px;display:flex;align-items:center;cursor:pointer}
.scrub-track{position:relative;width:100%;height:6px;background:rgba(255,255,255,.22);border-radius:999px}
.scrub-fill{position:absolute;left:0;top:0;bottom:0;background:var(--gold);border-radius:999px}
.scrub-mark{position:absolute;top:-5px;width:2px;height:16px;background:rgba(255,255,255,.45)}
.scrub-knob{position:absolute;top:50%;width:14px;height:14px;border-radius:50%;background:#fff;transform:translate(-50%,-50%);box-shadow:0 2px 6px rgba(0,0,0,.4)}
.time-box{font-variant-numeric:tabular-nums;font-size:14px;color:#c3d0da;white-space:nowrap}

/* ---------- timeline ---------- */
.timeline{margin-top:34px}
.tl-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;flex-wrap:wrap;margin-bottom:14px}
.tl-list{display:flex;flex-direction:column;gap:10px;max-height:520px;overflow:auto;padding-right:6px}
.tl-item{display:grid;grid-template-columns:112px 1fr;gap:16px;align-items:start;padding:14px 16px;background:#fff;
  border:1px solid var(--line);border-radius:12px;cursor:pointer;transition:.16s;text-align:left}
.tl-item:hover{border-color:var(--gold);box-shadow:var(--shadow)}
.tl-item.active{border-color:var(--green);background:#f2f7fb}
.tl-thumb{width:112px;aspect-ratio:16/10;object-fit:cover;border-radius:8px;background:#dfe4e8}
.tl-body h4{font-size:16.5px;margin-bottom:4px}
.tl-body p{margin:0;font-size:14.5px;color:var(--muted)}
.tl-time{font-variant-numeric:tabular-nums;font-size:13px;color:var(--gold);letter-spacing:.05em;margin-bottom:4px;display:block}

/* ---------- transcript ---------- */
.tp-search{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:18px}
.tp-search input{flex:1 1 260px;padding:12px 16px;border:1px solid var(--line);border-radius:999px;font:16px var(--sans);background:#fff}
.tp-search input:focus{outline:2px solid var(--gold);outline-offset:2px}
.tp-body{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:8px 0;max-height:600px;overflow:auto}
.tp-row{display:grid;grid-template-columns:74px 1fr;gap:14px;padding:9px 20px;cursor:pointer;border-bottom:1px solid #f0f1f3;font-size:16px}
.tp-row:hover{background:#f5f8fb}
.tp-row.active{background:#eef5fb}
.tp-row .t{color:var(--gold);font-variant-numeric:tabular-nums;font-size:13.5px;padding-top:3px}
.tp-row mark{background:#ffe9a8;padding:0 2px}

/* ---------- misc ---------- */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:18px;margin-top:24px}
.stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}
.stat b{display:block;font-family:var(--serif);font-size:26px;margin-bottom:4px}
.stat span{font-size:14px;color:var(--muted)}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:34px}
ul.clean{list-style:none;padding:0;margin:0}
ul.clean li{padding-left:22px;position:relative;margin-bottom:11px}
ul.clean li:before{content:"";position:absolute;left:0;top:.62em;width:8px;height:8px;border-radius:2px;background:var(--gold)}
footer{background:var(--dark);color:#c3d0da;padding:44px 0}
footer a{border-bottom:1px solid rgba(255,255,255,.25)}
.foot-in{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;font-size:15px}
.note{background:#fff;border-left:3px solid var(--gold);padding:16px 20px;border-radius:0 10px 10px 0;font-size:15.5px;color:#3a4550}
.dl-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}

@media (max-width:900px){
  .hero-grid,.two-col{grid-template-columns:1fr}
  section{padding:48px 0}
  .subs{min-height:78px}
}
@media (max-width:560px){
  .tl-item{grid-template-columns:1fr}
  .tl-thumb{width:100%}
  .tp-row{grid-template-columns:58px 1fr;font-size:15px}
  .stage-inner{padding:16px 12px 16px}
  .controls{gap:9px}
  .ctl{padding:8px 12px;font-size:13px}
}