.learn-main{padding-block:28px 64px;min-height:70vh}
.learn-hero{text-align:center;margin:16px auto 28px;max-width:760px}.learn-hero h1{font-size:clamp(28px,5vw,46px);letter-spacing:-.02em;margin:0 0 10px}.learn-hero p{color:var(--text-2);font-size:17px}
.lvl-tabs{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin:18px 0}.lvl-tabs a{padding:9px 18px;border-radius:999px;border:1px solid var(--line);background:var(--surface);font-weight:600;color:var(--text-2)}.lvl-tabs a.active,.lvl-tabs a:hover{background:var(--brand);color:#fff;border-color:var(--brand);text-decoration:none}
.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}
.course{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:.2s;color:inherit}.course:hover{transform:translateY(-3px);box-shadow:0 18px 40px -22px rgba(11,42,111,.45);text-decoration:none}
.course-cover{aspect-ratio:16/9;background:linear-gradient(135deg,var(--brand),#7c3aed);display:grid;place-items:center;color:#fff;font-weight:800;font-size:1.3rem;padding:12px;text-align:center;overflow:hidden}.course-cover img{width:100%;height:100%;object-fit:cover}
.course-body{padding:14px 16px;display:flex;flex-direction:column;gap:6px;flex:1}.course-body h3{margin:0;font-size:1.05rem}.course-meta{display:flex;gap:6px;flex-wrap:wrap}.course-foot{margin-top:auto;display:flex;justify-content:space-between;align-items:center;padding-top:8px}
.price{font-weight:800;font-size:1.05rem}.price.free{color:var(--ok,#16a34a)}
.course-layout{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:24px;align-items:start}@media(max-width:900px){.course-layout{grid-template-columns:1fr}}
.lesson-list{list-style:none;margin:0;padding:0}.lesson-list li{display:flex;gap:12px;align-items:center;padding:12px 14px;border-bottom:1px solid var(--line)}.lesson-list li:last-child{border:0}.lesson-list .ic{width:36px;height:36px;border-radius:10px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;flex:none}.lesson-list li.done .ic{background:#dcfce7;color:#16a34a}.lesson-list a{color:inherit;font-weight:600}
.pay-box{border:2px dashed var(--brand);border-radius:14px;padding:14px;background:var(--brand-soft)}.pay-num{display:flex;justify-content:space-between;gap:10px;align-items:center;padding:8px 0;border-bottom:1px solid var(--line)}.pay-num:last-child{border:0}.pay-num b{font-size:1.15rem;letter-spacing:.04em}
.player{width:100%;border-radius:14px;background:#000;max-height:70vh}.player-frame{aspect-ratio:16/9;width:100%;border:0;border-radius:14px;background:#000}.doc-frame{width:100%;height:78vh;border:1px solid var(--line);border-radius:12px;background:#fff}
.progress{height:8px;border-radius:99px;background:var(--line);overflow:hidden}.progress i{display:block;height:100%;background:var(--brand)}
.lesson-body{white-space:pre-wrap;line-height:1.7;font-size:1.02rem}
.lesson-list .sec-head{background:var(--surface-2);padding:8px 16px;font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text-2);border-top:1px solid var(--line)}