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.course-cover svg{transform:none}}.course-cover{background:radial-gradient(120% 140% at 85% -20%, var(--cat-tint,color-mix(in srgb, var(--gold) 24%, transparent)) 0%, transparent 55%), linear-gradient(200deg, var(--surface-2), var(--navy-800));border-bottom:1px solid var(--line);place-items:center;height:96px;display:grid;position:relative}.course-cover svg{color:var(--cat-ink,var(--gold-2));opacity:.9;transition:transform .25s cubic-bezier(.16,1,.3,1)}.course-cover .pill-level{background:color-mix(in srgb, var(--surface) 85%, transparent);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);position:absolute;top:10px;left:12px}.course-cover 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th,.prose td{border:1px solid var(--line-2);text-align:left;padding:8px 10px}.prose th{background:var(--surface-2)}.understanding{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-s);flex-wrap:wrap;align-items:center;gap:10px 14px;padding:14px 16px;display:flex}.understanding-label{color:var(--ink-2);font-size:13.5px;font-weight:600}.understanding-opts{flex-wrap:wrap;gap:7px;display:flex}.u-chip{font:inherit;border:1px solid var(--line-2);background:var(--navy-900);color:var(--ink-2);cursor:pointer;border-radius:20px;padding:6px 12px;font-size:12.5px}.u-chip:hover{border-color:var(--gold)}.u-chip.sel{border-color:var(--gold);background:var(--brand-soft);color:var(--gold-2);font-weight:600}.video-wrap{border-radius:var(--radius);aspect-ratio:16/9;background:#000;position:relative;overflow:hidden}.video-el{width:100%;height:100%;display:block}.cue-overlay{background:#080c16e6;place-items:center;padding:20px;display:grid;position:absolute;inset:0}.cue-card{background:var(--surface);border:1px solid var(--gold);border-radius:var(--radius);flex-direction:column;gap:12px;width:100%;max-width:480px;padding:22px;display:flex}.cue-q{margin:0;font-size:1.02rem;font-weight:600;line-height:1.5}.cue-opts{flex-direction:column;gap:8px;display:flex}.cue-opt,.quiz-opt{text-align:left;font:inherit;color:var(--ink);background:var(--navy-900);border:1px solid var(--line-2);border-radius:var(--radius-s);cursor:pointer;align-items:flex-start;gap:10px;padding:11px 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14px;font-size:14px;font-weight:600}.quiz-banner.pass{background:var(--success-soft);color:var(--ok)}.quiz-banner.fail{background:var(--warn-soft);color:var(--warn)}.quiz-banner.cooldown{background:var(--crit-soft);color:var(--danger)}.quiz-list{counter-reset:q;flex-direction:column;gap:18px;margin:0;padding:0;list-style:none;display:flex}.quiz-q{counter-increment:q}.quiz-stem{margin:0 0 10px;font-weight:600;line-height:1.5}.quiz-stem:before{content:"Câu " counter(q) ". ";color:var(--gold-2);font-variant-numeric:tabular-nums;font-size:13px;font-weight:650}.quiz-opts{flex-direction:column;gap:8px;display:flex}.quiz-opt.chosen{border-color:var(--gold)}.quiz-explain{color:var(--muted);border-left:2px solid var(--line-2);margin:8px 0 0;padding-left:12px;font-size:13px;line-height:1.55}.game-grid{grid-template-columns:1.15fr 1fr;gap:18px;margin-bottom:18px;display:grid}@media (max-width:860px){.game-grid{grid-template-columns:1fr}}.level-head{justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:8px;display:flex}.level-badge{color:var(--gold-2);font-size:1.05rem;font-weight:800}.level-next{color:var(--muted);font-size:12px}.level-bar{background:var(--navy-900);border-radius:6px;height:10px;overflow:hidden}.level-fill{background:linear-gradient(90deg, var(--blue), var(--gold-2));border-radius:6px;height:100%;transition:width 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