/* Learn AI course experience v2 — course overview + lesson player (pairs with course.js).
   Layout: an overview page (cover, outcomes, syllabus, FAQ) and a two-pane player
   (inline video / reading on the left, the syllabus sidebar on the right). */

/* ── Overview ─────────────────────────────────────────────────── */
.co{padding:26px 0 40px}
.co-hero{display:grid;grid-template-columns:1fr 300px;gap:44px;align-items:center;padding:14px 0 28px}
.co-cover{display:flex;justify-content:center;align-items:center;min-height:330px}
.co-hero h1{font-size:clamp(36px,5vw,60px);margin:10px 0 12px}
.co-tag{font-family:var(--serif);font-size:clamp(20px,2.4vw,26px);color:var(--paper2);line-height:1.3;margin:0 0 16px}
.co-meta{display:flex;flex-wrap:wrap;gap:8px 18px;font-size:13.5px;color:var(--paper2);margin:0 0 22px}
.co-meta span::before{content:"✦";color:var(--gold);margin-right:7px;font-size:10px}
.co-cta{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.co-prog{display:flex;align-items:center;gap:12px;margin-top:16px;max-width:520px}
.co-prog .progress{flex:1}
.co-prog .n{font-size:12.5px;color:var(--paper2);white-space:nowrap}
.co-body{display:grid;grid-template-columns:1fr 320px;gap:44px;align-items:start;margin-top:22px}
.co-main>section{padding:26px 0;border-top:1px solid var(--line)}
.co-main h2{font-size:clamp(24px,3vw,32px);margin:0 0 16px}
.co-side{position:sticky;top:calc(var(--nav-h) + 20px)}
.facts{display:grid;gap:0}
.facts div{display:flex;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px solid var(--line);font-size:14px}
.facts div:last-child{border-bottom:0}
.facts span{color:var(--mut)}
.facts b{font-weight:500;color:var(--paper);text-align:right}
.outcomes{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:10px 22px}
.outcomes li{position:relative;padding-left:26px;color:var(--paper2);font-size:15px;line-height:1.5}
.outcomes li::before{content:"✓";position:absolute;left:0;top:0;color:var(--gold);font-weight:700}
.co-about p{color:var(--paper2);font-size:16px;line-height:1.7;max-width:680px;margin:0 0 14px}
.tools{display:flex;flex-wrap:wrap;gap:8px}
.tools span{border:1px solid var(--line2);border-radius:999px;padding:5px 12px;font-size:13px;color:var(--paper2)}
.syl-mod{border:1px solid var(--line);border-radius:16px;margin-bottom:12px;overflow:hidden;background:rgba(241,232,214,.015)}
.syl-h{display:flex;align-items:center;gap:16px;padding:16px 18px;cursor:pointer}
.syl-h .num{font-family:var(--serif);font-size:30px;color:var(--gold);line-height:1;min-width:38px}
.syl-h b{display:block;font-size:16px;font-weight:600}
.syl-h small{display:block;color:var(--mut);font-size:13px;margin-top:2px}
.syl-h .cnt{margin-left:auto;font-size:12.5px;color:var(--mut);white-space:nowrap}
.syl-item{display:flex;align-items:center;gap:12px;padding:11px 18px;border-top:1px solid var(--line);color:var(--paper2);font-size:14.5px;text-decoration:none;transition:background .15s}
.syl-item:hover{background:rgba(214,178,94,.05);color:var(--paper)}
.syl-ic{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;background:var(--pan2);border:1px solid var(--line);font-size:12px;color:var(--paper2);flex:none}
.syl-item.done .syl-ic{color:var(--sage);border-color:rgba(154,211,168,.45);background:rgba(154,211,168,.08)}
.syl-item .min{margin-left:auto;font-size:12px;color:var(--mut);white-space:nowrap}
.syl-item.check .syl-ic{color:var(--gold)}
.syl-item.exam{background:linear-gradient(90deg,rgba(214,178,94,.06),transparent)}
.instructor{display:flex;gap:18px;align-items:center}
.instructor .av{width:64px;height:64px;border-radius:50%;background:linear-gradient(160deg,#3a2d21,#1a130e);border:1px solid var(--line2);display:grid;place-items:center;font-family:var(--serif);font-size:28px;color:var(--gold);flex:none}
.instructor p{margin:4px 0 0;color:var(--paper2);font-size:14.5px}
.next-vols{display:flex;gap:44px;flex-wrap:wrap;padding:10px 0 40px}
.next-vols .vbook{margin-bottom:28px}
@media(max-width:900px){.co-hero{grid-template-columns:1fr;gap:20px}.co-cover{order:-1;min-height:260px}.co-body{grid-template-columns:1fr}.co-side{position:static}.outcomes{grid-template-columns:1fr}}

/* ── Player ───────────────────────────────────────────────────── */
main.is-player{max-width:none;padding:0}
.pl{display:grid;grid-template-columns:minmax(0,1fr) 340px;min-height:calc(100vh - var(--nav-h))}
.pl-main{padding:18px 40px 40px;max-width:940px;width:100%;justify-self:center}
.pl-top{display:flex;align-items:center;gap:12px;font-size:13px;color:var(--mut);margin-bottom:16px;flex-wrap:wrap}
.pl-top a{color:var(--paper2)}.pl-top a:hover{color:var(--paper)}
.pl-top .sp{flex:1}
.pl-top .progress{width:120px}
.pl-syl-btn{display:none}
.pl-kicker{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:8px}
.pl-h1{font-size:clamp(28px,3.6vw,42px);margin:0 0 14px}
.pl-summary{color:var(--paper2);font-size:17px;line-height:1.6;max-width:720px;margin:0 0 22px}
.pl-video{position:relative;aspect-ratio:16/9;background:#000;border-radius:14px;overflow:hidden;border:1px solid var(--line);margin:0 0 22px;box-shadow:var(--shadow)}
.pl-video video,.pl-video iframe{position:absolute;inset:0;width:100%;height:100%;border:0;background:#000;object-fit:contain}
.pl-video .ph{position:absolute;inset:0;display:grid;place-items:center;color:var(--paper2);text-align:center;font-size:14px;padding:20px;background:linear-gradient(160deg,#171512,#0f0e0b)}
.pl-read{display:flex;align-items:center;gap:14px;border:1px solid var(--line);border-radius:14px;padding:14px 18px;margin:0 0 22px;background:rgba(241,232,214,.02)}
.pl-read .ic{font-family:var(--serif);font-size:30px;color:var(--gold);line-height:1}
.pl-read b{display:block;font-size:14px}
.pl-read small{color:var(--mut);font-size:12.5px}
.pl-text{margin-top:6px}
.pl-text .prose h2{font-size:clamp(24px,2.8vw,30px);margin:1.6em 0 .45em}
.pl-text .prose>*:first-child{margin-top:0}
.ex{background:#0a0907;border:1px solid var(--line);border-radius:12px;overflow:hidden;margin:1.2em 0}
.ex-top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:9px 13px;border-bottom:1px solid var(--line);background:rgba(214,178,94,.04)}
.ex-lbl{font-family:var(--mono);font-size:12px;color:var(--gold);letter-spacing:.3px}
.ex-copy,.lb-copy{font-family:var(--mono);font-size:12px;font-weight:600;padding:6px 12px;border-radius:8px;border:1px solid var(--line);background:rgba(214,178,94,.1);color:var(--gold);cursor:pointer;white-space:nowrap;transition:background .15s,color .15s,border-color .15s}
.ex-copy:hover,.lb-copy:hover{border-color:var(--gold)}
.ex-copy.done,.lb-copy.done{background:var(--gr);color:#0f0e0b;border-color:var(--gr)}
.ex pre{margin:0;padding:14px;font-family:var(--mono);font-size:13px;line-height:1.62;color:#e6dcc4;white-space:pre-wrap;word-break:break-word;max-height:420px;overflow:auto}
.lesson-box{border:1px solid var(--line2);border-radius:16px;padding:20px 22px;margin:28px 0 0;background:linear-gradient(180deg,rgba(214,178,94,.06),rgba(214,178,94,.02))}
.lesson-box h3{font-family:var(--serif);font-weight:400;font-size:22px;margin:0 0 10px}
.lesson-box ul{margin:0;padding-left:1.2em;color:var(--paper2);font-size:15px;line-height:1.6}
.lesson-box li::marker{color:var(--gold)}
.lesson-box p{margin:0;color:var(--paper2);font-size:15px;line-height:1.65}
.lesson-box.try{border-color:rgba(154,211,168,.35);background:linear-gradient(180deg,rgba(154,211,168,.07),transparent)}
.build{margin:30px 0 0;padding-top:24px;border-top:1px solid var(--line)}
.build>.eyebrow{margin-bottom:10px}
.build h3{font-family:var(--serif);font-weight:400;font-size:26px;margin:0 0 12px}
.lbody{margin:6px 0}
.lb-p{color:var(--paper2);font-size:15.5px;line-height:1.65;margin:0 0 12px}
.lb-p b{color:var(--paper)}
.lb-prompt{background:#0a0907;border:1px solid var(--line);border-radius:12px;overflow:hidden;margin:10px 0}
.lb-top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:9px 13px;border-bottom:1px solid var(--line);background:rgba(214,178,94,.04)}
.lb-lbl{font-family:var(--mono);font-size:12px;color:var(--gold);letter-spacing:.3px}
.lb-prompt pre{margin:0;padding:14px;font-family:var(--mono);font-size:12.5px;line-height:1.62;color:#e6dcc4;white-space:pre-wrap;word-break:break-word;max-height:380px;overflow:auto}
.lb-tip{font-size:13.5px;color:#ffe0a3;margin:12px 0 0;line-height:1.55}
.resources{margin:22px 0 0;padding:0;list-style:none}
.resources li{padding:8px 0;border-top:1px solid var(--line);font-size:14px}
.resources a{border-bottom:1px solid rgba(214,178,94,.35)}
.notes{margin-top:28px;border:1px solid var(--line);border-radius:14px;padding:14px 16px}
.notes label{display:block;font-size:12px;letter-spacing:1.6px;text-transform:uppercase;color:var(--gold);margin-bottom:8px}
.notes textarea{width:100%;min-height:90px;border:0;background:transparent;color:var(--paper);font-family:var(--sans);font-size:14px;line-height:1.55;resize:vertical;outline:none}
.notes small{color:var(--mut);font-size:12px}
.pl-nav{position:sticky;bottom:0;z-index:5;display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:34px;padding:14px 0;border-top:1px solid var(--line);background:rgba(15,14,11,.92);backdrop-filter:blur(10px)}
.pl-nav .done-note{color:var(--sage);font-size:13px}
.pl-nav .btn{max-width:100%}
/* sidebar */
.pl-side{border-left:1px solid var(--line);background:linear-gradient(180deg,var(--ink2),var(--ink));position:sticky;top:var(--nav-h);height:calc(100vh - var(--nav-h));overflow:auto;padding:18px 14px 30px}
.pl-side-h{padding:6px 8px 14px;border-bottom:1px solid var(--line);margin-bottom:10px}
.pl-side-h a.t{display:block;font-family:var(--serif);font-size:22px;color:var(--paper);line-height:1.15}
.pl-side-h .vol{font-size:11px;letter-spacing:2px;text-transform:uppercase;color:var(--gold);margin-bottom:6px}
.pl-side-h .pr{display:flex;align-items:center;gap:10px;margin-top:10px}
.pl-side-h .pr .progress{flex:1}
.pl-side-h .pr small{color:var(--mut);font-size:12px;white-space:nowrap}
.pl-mod{margin-bottom:6px}
.pl-mod-h{display:flex;gap:8px;align-items:baseline;font-size:11.5px;letter-spacing:1.4px;text-transform:uppercase;color:var(--gold);padding:12px 8px 6px}
.pl-mod-h small{color:var(--mut);letter-spacing:0;text-transform:none;font-size:11.5px;margin-left:auto}
.pl-item{display:flex;gap:10px;align-items:center;padding:9px 10px;border-radius:10px;color:var(--paper2);font-size:13.5px;line-height:1.3;cursor:pointer;text-decoration:none;border:1px solid transparent}
.pl-item:hover{background:rgba(241,232,214,.05);color:var(--paper)}
.pl-item.cur{background:var(--gold-soft);border-color:rgba(214,178,94,.3);color:var(--paper)}
.pl-item .ic{width:22px;height:22px;border-radius:6px;display:grid;place-items:center;font-size:11px;background:var(--pan2);border:1px solid var(--line);flex:none;color:var(--paper2)}
.pl-item.done .ic{color:#0f0e0b;background:var(--sage);border-color:var(--sage)}
.pl-item.check .ic{color:var(--gold)}
.pl-item .min{margin-left:auto;font-size:11px;color:var(--mut);white-space:nowrap}
.pl-item.exam{margin-top:6px;border-top:1px solid var(--line);border-radius:0 0 10px 10px;padding-top:12px}
.pl-side-x{display:none}
@media(max-width:980px){
  .pl{grid-template-columns:1fr}
  .pl-main{padding:14px 18px 30px}
  .pl-syl-btn{display:inline-flex}
  .pl-side{position:fixed;inset:0;left:auto;width:min(380px,92vw);height:100vh;z-index:130;transform:translateX(102%);transition:transform .25s;box-shadow:-20px 0 50px rgba(0,0,0,.5)}
  .pl-side.open{transform:none}
  .pl-side-x{display:block;position:absolute;top:10px;right:10px;background:none;border:1px solid var(--line);border-radius:8px;color:var(--paper);width:34px;height:34px;cursor:pointer}
  .pl-scrim{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:120;display:none}
  .pl-scrim.open{display:block}
}

/* ── Quizzes (knowledge checks + final exam) ───────────────────── */
.qz-intro{border:1px solid var(--line2);border-radius:16px;padding:22px;margin-bottom:22px;background:linear-gradient(180deg,rgba(214,178,94,.06),transparent)}
.qz-intro p{margin:0;color:var(--paper2);font-size:15px}
.q{border:1px solid var(--line);border-radius:14px;padding:18px;margin:0 0 14px;background:rgba(241,232,214,.015)}
.q .qn{font-size:11px;letter-spacing:1.6px;text-transform:uppercase;color:var(--gold);margin-bottom:6px}
.q .qt{font-weight:600;font-size:16.5px;margin:0 0 12px;line-height:1.4}
.opt{display:flex;gap:12px;align-items:flex-start;padding:11px 13px;border:1px solid var(--line);border-radius:10px;margin-bottom:8px;cursor:pointer;font-size:14.5px;line-height:1.45;color:var(--paper2);transition:border-color .15s,background .15s}
.opt:hover{border-color:var(--gold)}
.opt input{margin:3px 0 0;accent-color:var(--gold)}
.opt.sel{border-color:var(--gold);background:rgba(214,178,94,.07);color:var(--paper)}
.opt.right{border-color:rgba(154,211,168,.7);background:rgba(154,211,168,.1);color:var(--paper)}
.opt.wrong{border-color:rgba(240,169,155,.7);background:rgba(240,169,155,.08)}
.q .why{margin-top:8px;padding:10px 13px;border-left:3px solid var(--gold);background:var(--gold-soft);border-radius:0 10px 10px 0;font-size:14px;color:var(--paper);line-height:1.55}
.q.ok .why{border-color:var(--sage)}
.qz-actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:18px}
.qz-res{border:1px solid var(--line2);border-radius:16px;padding:24px;text-align:center;margin:0 0 22px}
.qz-res .big{font-family:var(--serif);font-size:56px;line-height:1;color:var(--gold)}
.qz-res .big.fail{color:var(--rose)}
.qz-res p{margin:8px 0 0;color:var(--paper2)}
.qz-res .ok{color:var(--sage)}
.qz-res .review{margin-top:14px;text-align:left;font-size:14px;color:var(--paper2)}
.qz-res .review li{margin:4px 0}

/* ── Certificate ──────────────────────────────────────────────── */
.cert{border:1px solid rgba(214,178,94,.55);border-radius:6px;padding:40px 44px;text-align:center;background:linear-gradient(180deg,#f7f0e0,#efe4cc);color:#1a1405;position:relative;max-width:760px;margin:0 auto;box-shadow:var(--shadow)}
.cert::before{content:"";position:absolute;inset:10px;border:1px solid rgba(184,148,63,.55);border-radius:3px;pointer-events:none}
.cert .cl{font-size:11px;letter-spacing:3px;text-transform:uppercase;color:#7a6224}
.cert h2{font-family:var(--serif);font-weight:400;font-size:clamp(30px,4.6vw,46px);margin:14px 0 8px;color:#1a1405}
.cert .nm{font-family:var(--serif);font-size:clamp(28px,4vw,40px);font-style:italic;color:#7a6224;margin:12px 0 10px;border-bottom:1px solid rgba(184,148,63,.6);display:inline-block;padding:0 20px 4px}
.cert p{margin:6px 0;color:#3a2f16;font-size:15px}
.cert .sig{display:flex;justify-content:space-between;gap:20px;margin-top:30px;font-size:12.5px;color:#6b5a2e}
.cert .sig b{display:block;font-family:var(--serif);font-weight:400;font-size:18px;color:#1a1405}
.cert .seal{position:absolute;right:34px;bottom:34px;width:70px;height:70px;border-radius:50%;border:2px solid #b8943f;display:grid;place-items:center;font-family:var(--serif);color:#7a6224;font-size:22px;background:radial-gradient(circle,#f3e8c8,#e8d8a8)}
.cert-form{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin:0 0 22px}
.cert-form .input{max-width:320px}
@media print{body::before,body::after,.mk-nav,.mk-foot,.pl-side,.pl-nav,.pl-top,.cert-form,.no-print{display:none!important}body{background:#fff}.pl-main{padding:0;max-width:none}.cert{box-shadow:none;margin:0 auto}}
@media(max-width:600px){.cert{padding:28px 18px}.cert .seal{position:static;margin:16px auto 0}}