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a{color:var(--text-muted);font-size:.875rem;transition:all var(--transition-fast);display:flex;align-items:center;gap:var(--spacing-xs)}.footer-column a:hover{color:var(--primary);transform:translate(4px)}.footer-icon{font-size:.85rem}.footer-bottom{grid-column:1 / -1;padding-top:var(--spacing-xl);margin-top:var(--spacing-lg);border-top:1px solid var(--border)}.footer-bottom-content{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:var(--spacing-md)}.footer-bottom p{color:var(--text-muted);font-size:.875rem}.footer-stats{display:flex;gap:var(--spacing-lg)}.footer-stats span{color:var(--text-muted);font-size:.8rem;padding:var(--spacing-xs) var(--spacing-sm);background:#ffffff0d;border-radius:var(--radius-sm);border:1px solid var(--border)}@media(max-width:992px){.footer-content{grid-template-columns:1fr}.footer-brand{max-width:none;text-align:center}.footer-links{grid-template-columns:repeat(2,1fr);justify-items:center}.footer-column{align-items:center}.footer-column h4{text-align:center}}@media(max-width:576px){.footer-links{grid-template-columns:1fr;gap:var(--spacing-lg)}.footer-bottom-content{flex-direction:column;text-align:center}.footer-stats{flex-wrap:wrap;justify-content:center}}.sidebar{width:280px;height:calc(100vh - 70px);background:var(--bg-card);border-right:1px solid var(--border);position:sticky;top:70px;overflow-y:auto;transition:width var(--transition-normal);display:flex;flex-direction:column;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:10;flex-shrink:0}.sidebar.collapsed{width:60px}.sidebar-header{padding:var(--spacing-md);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid 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#e5e7eb;background-color:#f9fafb;color:#374151;cursor:pointer;font-family:inherit;font-weight:500;appearance:none;-webkit-appearance:none;-moz-appearance:none;background-image:url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");background-repeat:no-repeat;background-position:right 12px center;background-size:16px}.chat-panel.dark .model-select{background-color:#1f293780;border-color:#4b5563;color:#e5e7eb;background-image:url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e")}.model-select:focus{outline:none;border-color:#2563eb;box-shadow:0 0 0 3px #2563eb1a}.chat-messages{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:20px;background:#fff}.chat-panel.dark .chat-messages{background:#111827}.empty-state{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#9ca3af;text-align:center;padding:40px}.empty-icon{font-size:48px;margin-bottom:16px;opacity:.5}.empty-state p{font-size:16px;font-weight:600;color:#374151;margin:0 0 8px}.chat-panel.dark .empty-state p{color:#d1d5db}.empty-subtitle{font-size:13px;color:#9ca3af}.message{display:flex;gap:12px;max-width:100%}.message.user{align-self:flex-end;flex-direction:row-reverse}.message-avatar{width:32px;height:32px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}.message.assistant .message-avatar{background:#eef2ff;color:#4f46e5}.chat-panel.dark .message.assistant .message-avatar{background:#312e81;color:#c7d2fe}.message.user .message-avatar{background:#111827;color:#fff}.chat-panel.dark .message.user .message-avatar{background:#e5e7eb;color:#111827}.message-content{padding:12px 16px;border-radius:12px;font-size:14px;line-height:1.6;white-space:pre-wrap;position:relative;max-width:100%;word-break:break-word}.message.assistant .message-content{background:#f3f4f6;color:#1f2937;border-top-left-radius:4px}.chat-panel.dark .message.assistant .message-content{background:#1f2937;color:#e5e7eb}.message.user .message-content{background:#2563eb;color:#fff;border-top-right-radius:4px}.chat-panel.dark .message.user .message-content{background:#3b82f6}.message-content.typing{font-style:italic;color:#6b7280;background:transparent!important;padding:0}.chat-input{padding:16px 20px;background:#fff;border-top:1px solid #f3f4f6;display:flex;align-items:flex-end;gap:10px}.chat-panel.dark .chat-input{background:#111827;border-top-color:#374151}.chat-input textarea{flex:1;padding:12px 16px;border:1px solid #e5e7eb;border-radius:12px;font-size:14px;font-family:inherit;resize:none;max-height:120px;min-height:48px;background:#f9fafb;color:#1f2937;line-height:1.5;transition:all .2s}.chat-panel.dark .chat-input textarea{background:#1f2937;border-color:#374151;color:#f3f4f6}.chat-input textarea:focus{outline:none;border-color:#2563eb;background:#fff;box-shadow:0 0 0 3px #2563eb1a}.chat-panel.dark .chat-input textarea:focus{background:#111827}.send-btn{width:44px;height:44px;border-radius:12px;background:#2563eb;color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s;flex-shrink:0}.send-btn:hover:not(:disabled){background:#1d4ed8}.send-btn:disabled{background:#e5e7eb;color:#9ca3af;cursor:not-allowed}.chat-panel.dark .send-btn:disabled{background:#374151;color:#6b7280}.chat-settings{position:absolute;inset:0;background:#fff;z-index:20;padding:24px;display:flex;flex-direction:column;border-radius:16px;animation:slideUp .3s cubic-bezier(.16,1,.3,1);overflow-y:auto}.chat-settings::-webkit-scrollbar{width:6px}.chat-settings::-webkit-scrollbar-track{background:transparent}.chat-settings::-webkit-scrollbar-thumb{background-color:#e5e7eb;border-radius:20px}.chat-panel.dark .chat-settings::-webkit-scrollbar-thumb{background-color:#374151}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}.chat-panel.dark .chat-settings{background:#111827}.settings-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:32px}.settings-header h4{margin:0;font-size:20px;font-weight:600;color:#111827}.chat-panel.dark .settings-header h4{color:#f9fafb}.close-settings{background:transparent;border:none;font-size:24px;color:#6b7280;cursor:pointer;padding:8px;margin:-8px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:background .2s}.close-settings:hover{background:#f3f4f6;color:#111827}.chat-panel.dark .close-settings:hover{background:#374151;color:#f9fafb}.chat-settings label{display:flex;flex-direction:column;gap:10px;margin-bottom:24px}.chat-settings label span{font-size:15px;font-weight:500;color:#374151}.chat-panel.dark .chat-settings label span{color:#d1d5db}.chat-settings input,.chat-settings select{padding:14px 16px;border:1px solid #e5e7eb;border-radius:10px;font-size:15px;background:#fff;color:#1f2937;width:100%;box-sizing:border-box}.chat-settings input:focus,.chat-settings select:focus{outline:none;border-color:#2563eb;box-shadow:0 0 0 4px #2563eb1a}.chat-panel.dark .chat-settings input,.chat-panel.dark .chat-settings select{background:#1f2937;border-color:#374151;color:#f3f4f6}.chat-settings input::placeholder{color:#9ca3af}.privacy-notice{margin-top:auto;margin-bottom:24px;font-size:13px;color:#6b7280;text-align:center;padding:16px;background:#f9fafb;border-radius:10px;display:flex;align-items:center;justify-content:center;gap:8px;line-height:1.5}.chat-panel.dark .privacy-notice{background:#1f2937;color:#9ca3af}.save-btn{width:100%;padding:16px;background:#2563eb;color:#fff;border:none;border-radius:10px;font-weight:600;font-size:16px;cursor:pointer;transition:all .2s;box-shadow:0 4px 6px -1px #2563eb1a,0 2px 4px -1px #2563eb0f}.save-btn:hover{background:#1d4ed8;transform:translateY(-1px);box-shadow:0 6px 8px -1px #2563eb33,0 4px 6px -1px #2563eb1a}.save-btn:active{transform:translateY(0)}.chat-messages::-webkit-scrollbar{width:6px}.chat-messages::-webkit-scrollbar-track{background:transparent}.chat-messages::-webkit-scrollbar-thumb{background-color:#e5e7eb;border-radius:20px}.chat-panel.dark .chat-messages::-webkit-scrollbar-thumb{background-color:#374151}@media(max-width:480px){.chat-panel{width:100%;height:100%;max-width:none;max-height:none;inset:0;border-radius:0}.chat-fab{bottom:20px;right:20px}}.floating-code-container{position:absolute;inset:0;overflow:hidden;pointer-events:none;z-index:0}.floating-code-symbol{position:absolute;font-family:var(--font-mono);font-size:1.5rem;font-weight:600;color:var(--primary);pointer-events:none;-webkit-user-select:none;user-select:none;will-change:transform,opacity;text-shadow:0 0 20px var(--primary-glow)}.floating-code-symbol:nth-child(3n){color:#a855f7;text-shadow:0 0 20px rgba(168,85,247,.2)}.floating-code-symbol:nth-child(3n+1){color:#10b981;text-shadow:0 0 20px rgba(16,185,129,.2)}.floating-code-symbol:nth-child(3n+2){color:#3b82f6;text-shadow:0 0 20px rgba(59,130,246,.2)}.floating-code-symbol:nth-child(5n){font-size:2.5rem;font-weight:800}.floating-code-symbol:nth-child(7n){font-size:1rem;opacity:.4}[data-theme=dark] .floating-code-symbol{opacity:.6}.home{padding-bottom:var(--spacing-2xl);background:#fff;min-height:100vh}.hero{position:relative;padding:var(--spacing-2xl) 0;min-height:60vh;display:flex;align-items:center;overflow:hidden;background:linear-gradient(180deg,#fff,#f8fafc)}.hero-bg{position:absolute;inset:0;background:radial-gradient(circle at 10% 20%,rgba(34,197,94,.12) 0%,transparent 40%),radial-gradient(circle at 90% 80%,rgba(249,115,22,.1) 0%,transparent 40%);opacity:.8;z-index:-1}.hero-content{position:relative;width:100%}.hero-text{max-width:800px;margin:0 auto;text-align:center}.hero-title{font-size:4.5rem;font-weight:900;line-height:1.05;margin-bottom:var(--spacing-lg);color:#0f172a;letter-spacing:-.04em}.gradient-text{background:linear-gradient(135deg,#16a34a,#22c55e);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:1.5rem;color:var(--text-secondary);max-width:600px;margin:0 auto var(--spacing-2xl);line-height:1.6;font-weight:500;color:#475569}.hero-stats{display:flex;justify-content:center;gap:4rem;margin-top:var(--spacing-2xl)}.stat{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs)}.stat-value{font-size:2.5rem;font-weight:800;color:#16a34a;letter-spacing:-.02em}.stat-label{font-size:.8125rem;color:#64748b;text-transform:uppercase;font-weight:700;letter-spacing:.1em}.categories-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:var(--spacing-lg)}.category-card-link{text-decoration:none;color:inherit;display:block}.category-card{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-xl);text-align:center;cursor:pointer;background:#fff;border:1px solid #e2e8f0;border-radius:var(--radius-lg);transition:all .3s ease;box-shadow:0 1px 3px #0000000d}.category-card:hover{border-color:#14b8a6;box-shadow:0 8px 24px #14b8a626;transform:translateY(-4px)}.category-icon{font-size:2.5rem;margin-bottom:var(--spacing-xs)}.category-name{font-size:1.125rem;font-weight:700;color:#0f172a}.category-count{font-size:.875rem;color:#64748b;font-weight:500}.problems-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(360px,1fr));gap:var(--spacing-xl)}.linked-list-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:var(--spacing-xl)}.linked-list-card{display:flex;flex-direction:column;padding:var(--spacing-xl);background:linear-gradient(135deg,#f0fdf4,#e0f2fe);border:2px solid #86efac;border-radius:var(--radius-lg);transition:all .3s ease}.linked-list-card:hover{border-color:#22c55e;box-shadow:0 12px 24px #22c55e33;transform:translateY(-6px)}.card-header{display:flex;align-items:center;gap:var(--spacing-md);margin-bottom:var(--spacing-lg)}.card-icon{font-size:2rem}.card-title{margin:0;font-size:1.5rem;font-weight:700;color:var(--text-primary)}.card-description{margin:0 0 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