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var(--ease);overflow:hidden}.strip-card:hover{border-color:var(--border-hover);transform:translateY(-2px);box-shadow:var(--shadow)}.strip-icon{font-size:1.6rem;flex-shrink:0}.strip-label{color:var(--text-dim);letter-spacing:.08em;text-transform:uppercase;margin-bottom:3px}.strip-title{font-weight:700;font-size:.88rem;color:var(--text)}.strip-xp{margin-left:auto;flex-shrink:0;display:flex;align-items:center;gap:4px;font-family:var(--font-mono);font-size:.72rem;font-weight:700;background:#f59e0b1f;border:1px solid rgba(245,158,11,.3);color:#fcd34d;padding:3px 9px;border-radius:100px}.strip-dot{position:absolute;top:10px;right:10px;width:8px;height:8px;border-radius:50%;background:#ef4444;animation:pulse 2s infinite}.strip-daily{border-color:#f59e0b33}.strip-daily:hover{border-color:#f59e0b80;box-shadow:0 4px 20px #f59e0b26}.strip-done{opacity:.7}.strip-done .strip-label:before{content:"✓ ";color:#10b981}.strip-exam{border-color:#3b82f633}.strip-streak{border-color:#ef444433}@media 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.18s;letter-spacing:.02em}.lesson-tab:hover{color:var(--text);background:#ffffff0a}.lesson-tab.active{background:var(--bg-card);color:var(--text-accent);border:1px solid var(--border);box-shadow:var(--shadow-sm)}.lesson-body{margin-bottom:3rem}.lesson-nav{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding-top:2rem;border-top:1px solid var(--border)}.lesson-nav-btn{display:flex;align-items:center;gap:12px;padding:1rem 1.25rem;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--bg-card);transition:all 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8px;border-radius:var(--r-sm);font-weight:500}.tag-blue{background:#3b82f626;color:#93c5fd}.tag-purple{background:#8b5cf626;color:#c4b5fd}.tag-green{background:#10b98126;color:#6ee7b7}.tag-cyan{background:#06b6d426;color:#67e8f9}.progress-bar{height:4px;background:#ffffff14;border-radius:2px;overflow:hidden}.progress-fill{height:100%;border-radius:2px;background:linear-gradient(90deg,var(--accent),var(--accent-3));transition:width .6s var(--ease)}@keyframes fadeIn{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.8)}}@keyframes shimmer{0%{background-position:-200% center}to{background-position:200% center}}.animate-fade{animation:fadeIn .35s var(--ease) both}.divider{height:1px;background:var(--border);margin:2rem 0}.quiz-option{display:flex;align-items:center;gap:12px;padding:12px 16px;border:1px solid var(--border);border-radius:var(--r);cursor:pointer;font-size:.9rem;color:var(--text-muted);background:var(--bg-card);transition:all .18s}.quiz-option:hover:not(:disabled){border-color:var(--accent);color:var(--text);background:#3b82f60d}.quiz-option.correct{border-color:var(--green);background:var(--green-bg);color:#6ee7b7}.quiz-option.wrong{border-color:var(--red);background:var(--red-bg);color:#fca5a5}.quiz-option.selected{border-color:var(--accent);background:var(--accent-glow);color:var(--text-accent)}.option-letter{width:26px;height:26px;border-radius:var(--r-sm);background:#ffffff0f;border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:.72rem;font-weight:700;flex-shrink:0}.flashcard{perspective:1200px;width:100%;height:280px;cursor:pointer;-webkit-user-select:none;user-select:none}.flashcard-inner{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.4,0,.2,1)}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-face{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:var(--r-xl);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem;backface-visibility:hidden;-webkit-backface-visibility:hidden;text-align:center}.flashcard-front{background:var(--bg-card);border:1px solid var(--border)}.flashcard-back{background:linear-gradient(135deg,#3b82f61a,#8b5cf61a);border:1px solid rgba(59,130,246,.3);transform:rotateY(180deg)}.expandable{border:1px solid var(--border);border-radius:var(--r);margin-bottom:.75rem;overflow:hidden;transition:border-color .2s}.expandable:hover{border-color:var(--border-hover)}.expandable-header{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;cursor:pointer;background:#ffffff05;font-weight:600;font-size:.93rem;gap:12px;transition:background .18s}.expandable-header:hover{background:#ffffff0a}.expandable-body{padding:16px 18px;border-top:1px solid var(--border);font-size:.9rem;color:var(--text-muted);line-height:1.7}.search-input{width:100%;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--r);padding:10px 16px 10px 42px;color:var(--text);font-size:.9rem;font-family:var(--font-body);outline:none;transition:border-color .2s}.search-input:focus{border-color:var(--border-focus)}.search-input::placeholder{color:var(--text-dim)}@media (max-width: 768px){.container{padding:0 1rem}.hide-mobile{display:none!important}}@media (min-width: 768px){.show-mobile-only{display:none!important}}