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h2{font-size:20px}.subchapters-list{display:flex;flex-direction:column;gap:8px}.subchapter-item{display:flex;align-items:center;gap:14px;background:var(--bg-card);border-radius:var(--radius);padding:16px 20px;box-shadow:var(--shadow);cursor:pointer;transition:transform .15s,box-shadow .15s;border:2px solid transparent}.subchapter-item.unlocked:hover{transform:translateY(-1px);box-shadow:0 6px 12px #0000001f;border-color:var(--primary-light)}.subchapter-item.locked{opacity:.45;cursor:not-allowed}.subchapter-item.current{border-color:var(--primary);background:#7c3aed0a}.subchapter-item.completed{border-color:var(--success);background:#10b9810a}.subchapter-icon{font-size:22px;flex-shrink:0}.subchapter-info{display:flex;flex-direction:column;gap:2px}.subchapter-level{font-size:12px;color:var(--text-light);font-weight:600;text-transform:uppercase;letter-spacing:.5px}.subchapter-name{font-size:15px;font-weight:600;color:var(--text)}.subchapter-play-btn{padding:14px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius);font-size:16px;font-weight:600;cursor:pointer;transition:background .2s;margin-top:8px}.subchapter-play-btn:hover{background:var(--primary-dark)}.minigame-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}.minigame-card{background:var(--bg-card);border-radius:var(--radius);padding:28px 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.memory-card-inner{transform:rotateY(180deg)}.memory-card-back,.memory-card-front{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;font-weight:700}.memory-card-back{background:linear-gradient(135deg,var(--primary),var(--primary-light));font-size:32px;box-shadow:var(--shadow)}.memory-card-front{background:var(--bg-card);border:2px solid var(--border);font-size:16px;transform:rotateY(180deg);color:var(--text)}.memory-card.matched .memory-card-front{border-color:var(--success);background:#ecfdf5;color:var(--success)}.speed-timer-bar{height:8px;background:var(--border);border-radius:4px;overflow:hidden;margin-bottom:24px}.speed-timer-fill{height:100%;border-radius:4px;transition:width 1s linear}.speed-problem{background:var(--bg-card);border-radius:var(--radius);padding:40px;box-shadow:var(--shadow);text-align:center;transition:background 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