.cover img{object-fit:cover;width:100%;height:100%;position:absolute;inset:0}.course-card{cursor:pointer}.player.has-video{aspect-ratio:16/9;background:#000;height:auto;min-height:0;max-height:78vh}.player iframe{border:0;width:100%;height:100%;position:absolute;inset:0}.player-note{z-index:1;opacity:.8;text-align:center;margin:0;padding:0 20px;font-size:14px;position:relative}.learn-status{color:var(--muted);margin:6px 0 24px;font-size:14px}button.brand{color:inherit;letter-spacing:-1px;background:0 0;padding:0;font-size:21px;font-weight:700}div.learn{max-width:1440px;padding-top:24px}.learn-back{color:var(--ink);border:1px solid var(--line);background:#fff;border-radius:99px;margin-bottom:18px;padding:9px 16px;font-size:13px;font-weight:700}.learn-back:hover{border-color:var(--coral);color:var(--coral)}.learn-grid{grid-template-columns:minmax(0,1fr) 360px;align-items:start;gap:24px;display:grid}.learn-main{border:1px solid var(--line);background:#fff;border-radius:18px;min-width:0;overflow:hidden}.learn-main .player{border-radius:0}.learn-main .lesson-head{border-bottom:0;padding:22px 24px}.learn-main .complete{margin-top:14px;display:inline-block;position:static}.learn-main .lesson-head>span{display:block}.learn-grid .lesson-list{border:1px solid var(--line);background:#fff;border-radius:18px;max-width:none;margin:0;padding:18px 0 6px;position:sticky;top:96px}.learn-grid .lesson-list>.section-heading{border-bottom:1px solid var(--line);margin-bottom:0;padding:0 18px 14px}.learn-grid .lesson-list .section-heading h2{font-size:18px}.lesson-scroll{max-height:calc(100vh - 260px);overflow-y:auto}.lesson-scroll>button{text-align:left;border-bottom:1px solid var(--line);width:100%;color:var(--ink);background:0 0;grid-template-columns:34px 1fr auto;gap:8px;padding:14px 18px;font-size:14px;display:grid}.lesson-scroll>button:last-child{border-bottom:0}.lesson-scroll>button:hover{background:#fbf8f2}.lesson-scroll>button b{color:#aab7b4;font-size:12px}.lesson-scroll>button small{color:var(--muted)}.lesson-scroll>button.current{background:#fdf1ee}.lesson-scroll>button.current span{color:var(--coral);font-weight:700}@media (max-width:900px){.learn-grid{grid-template-columns:1fr}.learn-grid .lesson-list{position:static}.lesson-scroll{max-height:none}}.auth-wait{min-height:100vh}.login-page{background:var(--cream);place-items:center;min-height:100vh;padding:20px 16px;display:grid}.login-page .login{box-shadow:0 24px 50px #173b3722}.login .pw{margin-top:12px}.login-error{color:#c0392b!important;margin:12px 0 0!important;font-size:13px!important}.login .primary:disabled{opacity:.6}.continue .progress i{display:none}.page .course-grid,.page .course-grid.all{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.page .course-card .cover{aspect-ratio:16/9;height:auto;padding:0}.page .course-card .cover>span{position:absolute;top:13px;left:13px}.page .course-card .course-info h3{min-height:36px;font-size:15px}@media (max-width:900px){.page .course-grid,.page .course-grid.all{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width:520px){.page .course-grid,.page .course-grid.all{grid-template-columns:minmax(0,1fr)}}.guest-login{background:var(--ink);color:#fff;border-radius:999px;padding:9px 18px;font-size:13px;font-weight:700}.guest-lead{color:var(--muted);max-width:620px;margin:-6px 0 22px;line-height:1.5}.tag.lock{color:#b5533f;background:#fbeee9}.player.locked{aspect-ratio:16/9;background:#0f2a28;justify-content:center;align-items:center;height:auto;min-height:0;display:flex;position:relative;overflow:hidden}.player.locked>img{object-fit:cover;filter:blur(3px)brightness(.35);width:100%;height:100%;position:absolute;inset:0}.player.locked .lock-box{text-align:center;color:#fff;box-sizing:border-box;width:min(100%,480px);min-width:0;padding:18px 22px;position:relative}.lock-box b{margin-bottom:4px;font-size:30px;display:block}.lock-box h3{white-space:normal;overflow-wrap:anywhere;margin:0 0 8px;font-size:18px;line-height:1.3}.lock-box p{opacity:.85;white-space:normal;margin:0 0 14px;font-size:14px;line-height:1.45}.lock-box .primary{color:#fff;background:#e77662;border-radius:999px;margin-bottom:12px;padding:11px 22px;font-size:14px;font-weight:700;display:inline-block}.zalo small{opacity:.8;margin-bottom:8px;font-size:12px;display:block}.zalo>div{flex-wrap:wrap;justify-content:center;gap:8px;display:flex}.zalo a{color:#fff;background:#0068ff;border-radius:999px;padding:8px 14px;font-size:13px;font-weight:700;text-decoration:none}.page>.zalo{text-align:center;color:var(--muted);margin-top:26px}.login-back{color:var(--muted);background:0 0;margin:14px auto 0;font-size:13px;text-decoration:underline;display:block}.login small a{color:#0068ff;font-weight:700}@media (max-width:600px){.player.locked{aspect-ratio:auto;min-height:260px}.lock-box h3{font-size:15px}.lock-box p{font-size:12px}.lock-box b{font-size:22px}.zalo a{padding:7px 11px;font-size:12px}}.lesson-head .free-cta{flex-wrap:wrap;align-items:center;gap:10px;margin-top:14px;display:flex}.mp3-dl{color:inherit;border:1px solid;border-radius:999px;align-items:center;gap:6px;margin:12px 12px 0 0;padding:10px 16px;font-size:14px;font-weight:600;text-decoration:none;display:inline-flex}.mp3-dl:hover{opacity:.8}.lesson-head .free-cta .mp3-dl{margin:0}.tag.free{color:#2f7d55;background:#e6f5ec;font-weight:700}