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sans-serif;--radius-sm:.375rem;--radius-md:.5rem;--radius-lg:.75rem;--radius-xl:1rem}[data-theme=light]{--color-bg-left:#f8fafc;--color-bg-right:#f1f5f9;--color-bg-body:#f8fafc;--color-bg-sidebar:#fff;--color-bg-topbar:#ffffffe6;--color-card-bg:#fff;--color-card-bg-hover:#f8fafc;--color-card-border:#e2e8f0;--color-card-border-hover:#6d28d959;--color-input-bg:#fff;--color-input-border:#cbd5e1;--color-input-border-hover:#94a3b8;--color-text-primary:#0f172a;--color-text-secondary:#475569;--color-text-muted:#64748b;--color-primary-purple:#6d28d9;--color-primary-blue:#1d4ed8;--color-accent-blue:#2563eb;--color-accent-purple:#7c3aed;--color-accent-pink:#db2777;--color-error:#dc2626;--color-success:#16a34a;--color-warning:#d97706;--gradient-primary:linear-gradient(135deg, #6d28d9, #1d4ed8);--gradient-logo:linear-gradient(135deg, #7c3aed, #db2777);--gradient-heading:linear-gradient(135deg, #6d28d9, 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p{color:var(--text-secondary);font-size:.95rem;line-height:1.6}.bento-card ul{flex-direction:column;gap:8px;margin-top:16px;list-style:none;display:flex}.bento-card ul li{color:var(--text-primary);font-size:.88rem;font-weight:500}.flashcard-demo{margin-top:20px}.flashcard{perspective:1000px;cursor:pointer;height:140px;position:relative}.flashcard-face{backface-visibility:hidden;border-radius:14px;flex-direction:column;justify-content:center;gap:8px;padding:20px;transition:transform .5s;display:flex;position:absolute;inset:0}.flashcard-front{background:#7c3aed1f;border:1px solid #7c3aed4d}.flashcard-back{background:var(--gradient);transform:rotateY(180deg)}.flashcard.flipped .flashcard-front{transform:rotateY(180deg)}.flashcard.flipped .flashcard-back{transform:rotateY(360deg)}.flashcard-label{text-transform:uppercase;letter-spacing:1px;opacity:.7;font-size:.7rem}.flashcard-face p{font-size:.9rem;font-weight:600;line-height:1.4}.flashcard-controls{color:var(--text-secondary);justify-content:space-between;align-items:center;margin-top:12px;font-size:.8rem;display:flex}.flashcard-controls button{color:var(--primary-light);cursor:pointer;background:0 0;border:none;font-size:.85rem;font-weight:600}.final-cta{padding:60px 24px 100px}.cta-card{background:var(--gradient);text-align:center;border-radius:28px;max-width:720px;margin:0 auto;padding:56px 40px}.cta-card h2{margin-bottom:10px;font-size:2rem}.cta-card p{opacity:.9;margin-bottom:26px}.cta-card .btn-primary{color:var(--primary);background:#fff}.footer{border-top:1px solid var(--border-soft);color:var(--text-secondary);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:32px 48px;font-size:.85rem;display:flex}.footer p{margin-top:6px}.footer-copy{opacity:.6}@media (width<=640px){.hero-title{font-size:2.2rem}.navbar,.footer{padding-left:20px;padding-right:20px}}[data-theme=light] 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10px;display:inline-flex}.ai-sparkle{font-size:.85rem}.loading-bubble{flex-direction:column;gap:8px;min-width:140px;padding:.8rem 1.25rem;display:inline-flex}.typing-header{color:var(--color-accent-purple);align-items:center;gap:6px;font-size:.76rem;font-weight:600;display:flex}.typing-text{color:var(--color-text-secondary)}.typing-indicator{align-items:center;gap:6px;height:18px;display:flex}.typing-indicator span{background:var(--color-accent-purple);border-radius:50%;width:7px;height:7px;animation:1.4s ease-in-out infinite typingBounce;display:block;box-shadow:0 0 8px #8b5cf699}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}.chat-input-form{background:var(--color-bg-topbar);border-top:1px solid var(--color-card-border);align-items:flex-end;gap:.75rem;padding:1rem 1.5rem;display:flex}.chat-input-form textarea{background:var(--color-input-bg);border:1px solid var(--color-input-border);border-radius:var(--radius-md);color:var(--color-text-primary);resize:none;outline:none;flex:1;min-height:44px;max-height:120px;padding:.75rem 1rem;font-family:inherit;font-size:.95rem;transition:border-color .2s}.chat-input-form textarea:focus{border-color:var(--color-primary-purple);box-shadow:0 0 8px #7c3aed4d}.chat-send-btn{background:var(--gradient-primary);color:#fff;border-radius:var(--radius-md);cursor:pointer;border:none;flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;transition:transform .15s,opacity .15s;display:flex}.chat-send-btn:hover:not(:disabled){transform:scale(1.05)}.chat-send-btn:active:not(:disabled){transform:scale(.95)}.chat-send-btn:disabled{color:var(--color-text-muted);cursor:not-allowed;background:#2a2a3ecc}@media (width<=768px){.chat-header{padding:.8rem 1rem}.chat-messages{gap:1rem;padding:1rem}.message-bubble{max-width:88%;padding:.8rem 1rem;font-size:.9rem}.chat-input-form{padding:.75rem 1rem}}@media (width<=480px){.message-bubble{max-width:94%}}