:root{--navy:#0A1428;--violet:#6B3FE7;--violet-d:#5a31cc;--gold:#C8A843;--ink:#1d2433;--muted:#5d6678;--line:#e6e8ef;--bg:#f6f7fb;--card:#fff;--ok:#2e7d4f}
*{box-sizing:border-box}
[hidden]{display:none!important}
body{margin:0;font:16px/1.65 Inter,system-ui,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--violet)}
img,video{max-width:100%;height:auto;border-radius:10px}
video{display:block;width:100%;background:#000;margin-bottom:20px}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px;border-radius:4px}
.skip{position:absolute;left:-999px;top:8px;background:#fff;padding:8px 14px;border-radius:8px;z-index:10}
.skip:focus{left:8px}

/* header */
.top{background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 24px;flex-wrap:wrap}
.brand{color:#fff;text-decoration:none;font-weight:700;letter-spacing:.08em}
.brand span{color:var(--gold)}
.menu{display:flex;align-items:center;gap:18px;font-size:.9rem;min-width:0}
.menu a{color:#dfe3f0;text-decoration:none;white-space:nowrap}
.menu a:hover{color:#fff}
.menu .who{color:#8f98ad;max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

main{max-width:1120px;margin:0 auto;padding:28px 16px 64px}
footer{text-align:center;color:var(--muted);font-size:.8rem;padding:24px}
h1{font-size:clamp(1.6rem,3vw,2.2rem);line-height:1.2;margin:.2em 0 .5em;color:var(--navy)}
.crumbs{font-size:.85rem;color:var(--muted);margin-bottom:12px}
.crumbs a{color:var(--muted)}
.muted{color:var(--muted)}
.btn{display:inline-block;background:var(--violet);color:#fff;text-decoration:none;font-weight:600;padding:10px 22px;border-radius:999px;border:0;cursor:pointer;font:inherit;font-weight:600}
.btn:hover{background:var(--violet-d)}

/* progress */
.bar{height:6px;background:#eceef4;border-radius:99px;overflow:hidden;margin:10px 0 0}
.bar i{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:left;background:linear-gradient(90deg,var(--violet),var(--gold));transition:transform .4s}
[data-lesson].done::after{content:" ✓";color:var(--ok);font-weight:700}

/* home */
.welcome{margin-bottom:24px}
.lead{color:var(--muted);margin:0 0 16px}
.resume{display:flex;align-items:center;gap:14px;background:var(--navy);color:#fff;text-decoration:none;border-radius:14px;padding:16px 20px}
.resume b{color:var(--gold);font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;display:block}
.resume span{flex:1}
.resume::after{content:"→";font-size:1.4rem;color:var(--gold)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden;text-decoration:none;color:inherit;transition:transform .15s,box-shadow .15s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-3px);box-shadow:0 10px 30px rgba(10,20,40,.1)}
.card img,.card .ph{display:block;width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:0;background:linear-gradient(135deg,var(--navy),var(--violet))}
.card>div{padding:14px 16px 16px}
.card h2{font-size:1.02rem;margin:0 0 4px;color:var(--navy);line-height:1.35}
.card p{margin:0;color:var(--muted);font-size:.88rem}

/* course */
.hero{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,3fr);gap:28px;align-items:start;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px;margin-bottom:24px}
.hero img,.hero .ph{width:100%;aspect-ratio:16/9;object-fit:cover}
.hero .meta{color:var(--muted);margin:0;font-weight:600;font-size:.9rem}
.hero .bar{margin-bottom:16px;max-width:320px}
.module{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:8px 24px 16px;margin-bottom:16px}
.module h2{font-size:1.1rem;color:var(--navy);border-bottom:2px solid var(--gold);display:inline-block}
.module li{margin:8px 0}
.module a{text-decoration:none}
.module a:hover{text-decoration:underline}

/* lesson */
.lesson{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;align-items:start}
article{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px clamp(16px,4vw,44px);min-width:0;font-size:1.02rem}
article h2,article h3{color:var(--navy);line-height:1.3}
.eyebrow{margin:0;color:var(--violet);font-weight:600;font-size:.82rem;letter-spacing:.04em;text-transform:uppercase}
article blockquote{margin:1.2em 0;padding:.8em 1.2em;font-style:italic;color:#3a3f4b;background:#fbf8ee;border-radius:10px}
article table{border-collapse:collapse;display:block;overflow-x:auto}
article td,article th{border:1px solid var(--line);padding:6px 10px}
aside{background:var(--navy);color:#fff;border-radius:14px;padding:16px 20px;position:sticky;top:16px;max-height:calc(100vh - 32px);overflow:auto}
aside h3{font-size:.95rem;margin:0 0 8px}
aside h3 a{color:var(--gold);text-decoration:none}
aside h4{font-size:.75rem;letter-spacing:.06em;text-transform:uppercase;color:#8f98ad;margin:14px 0 4px}
aside ol{padding-left:20px;margin:0}
aside li{margin:8px 0;font-size:.9rem}
aside a{color:#dfe3f0;text-decoration:none}
aside li.cur a{color:#fff;font-weight:700}
.gallery,.files{border-top:1px solid var(--line);margin-top:28px}
.gallery div{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.gallery img{display:block;width:100%;aspect-ratio:4/3;object-fit:cover;border:1px solid var(--line)}
.files li{margin:6px 0}
.pdfcard{display:flex;gap:20px;align-items:center;text-decoration:none;color:inherit;border:1px solid var(--line);border-radius:14px;padding:16px;margin:8px 0;background:#fafbfd}
.pdfcard:hover{border-color:var(--violet)}
.pdfcard img{width:180px;flex:none;border:1px solid var(--line);border-radius:8px;box-shadow:0 6px 18px rgba(10,20,40,.12)}
.pdfcard span{display:flex;flex-direction:column;gap:6px;align-items:flex-start}
.pdfcard small{color:var(--muted)}
.pdfcard em{font-style:normal;margin-top:6px}
@media (max-width:520px){.pdfcard{flex-direction:column;align-items:flex-start}.pdfcard img{width:100%}}
.done-row{margin-top:32px;display:flex;justify-content:center}
.mark{font:inherit;font-weight:600;background:#fff;color:var(--ink);border:2px solid var(--line);border-radius:999px;padding:9px 20px;cursor:pointer}
.mark[aria-pressed=true]{border-color:var(--ok);color:var(--ok);background:#f0faf4}
.pager{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;border-top:1px solid var(--line);margin-top:24px;padding-top:18px;font-weight:600}

/* quiz */
.quiz fieldset{border:1px solid var(--line);border-radius:10px;margin:0 0 14px;padding:12px 16px}
.quiz legend{float:left;width:100%;padding:0;margin-bottom:6px}
.quiz legend+*{clear:both}
.quiz label{display:block;margin:6px 0;cursor:pointer}
.quiz .good{border-color:#2e9e5b;background:#f0faf4}
.quiz .bad{border-color:#d64545;background:#fdf2f2}
.score{font-weight:700}
.msg{white-space:pre-line;border-radius:12px;padding:16px 20px;margin-top:12px}
.msg.win{background:#f0faf4;border:1px solid #2e9e5b}
.msg.fail{background:#fbf8ee;border:1px solid var(--gold)}

@media (max-width:820px){.lesson,.hero{grid-template-columns:1fr}aside{position:static;max-height:none}.menu .who{display:none}.top{padding:12px 16px}.menu{gap:16px;font-size:.85rem;overflow-x:auto;max-width:100%}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}