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var(--transition)}.nav-link:hover{color:var(--color-primary);background:var(--color-bg-secondary)}.nav-link.active{color:#fff;background:var(--color-primary)}.navbar-actions{display:flex;align-items:center;gap:.75rem}.theme-toggle{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:var(--color-bg-secondary);border-radius:var(--radius-md);color:var(--color-text);transition:all var(--transition)}.theme-toggle:hover{background:var(--color-bg-tertiary);color:var(--color-primary)}.mobile-toggle{display:none;width:40px;height:40px;align-items:center;justify-content:center;background:transparent;color:var(--color-text)}.mobile-menu{display:none;overflow:hidden}@media (max-width: 768px){.navbar-center{display:none}.mobile-toggle{display:flex}.mobile-menu{display:flex;flex-direction:column;padding:1rem;background:var(--color-surface);border-top:1px solid var(--color-border)}.mobile-link{padding:.75rem 1rem;color:var(--color-text-secondary);font-weight:500;border-radius:var(--radius-md);transition:all var(--transition)}.mobile-link:hover{background:var(--color-bg-secondary)}.mobile-link.active{color:var(--color-primary);background:var(--color-bg-secondary)}}.footer{background:var(--color-surface);border-top:1px solid var(--color-border);margin-top:auto}.footer-content{max-width:1400px;margin:0 auto;padding:1.5rem 2rem;display:flex;align-items:center;justify-content:space-between;gap:2rem}.footer-left{display:flex;flex-direction:column;gap:.25rem}.footer-brand{font-size:1.25rem;font-weight:700;background:linear-gradient(135deg,var(--color-primary),var(--color-primary-light));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.footer-tagline{font-size:.8125rem;color:var(--color-text-secondary)}.footer-links{display:flex;gap:2rem}.footer-links a{font-size:.875rem;color:var(--color-text-secondary);font-weight:500;transition:color .2s}.footer-links 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p{font-size:1.125rem;color:var(--color-text-secondary)}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:2rem}.feature-card{padding:2rem;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);transition:all var(--transition)}.feature-card:hover{box-shadow:var(--shadow-lg);border-color:var(--color-primary)}.feature-icon{width:56px;height:56px;display:flex;align-items:center;justify-content:center;background:var(--color-bg-secondary);color:var(--color-primary);border-radius:var(--radius-md);margin-bottom:1.5rem}.feature-card h3{font-size:1.25rem;margin-bottom:.75rem}.feature-card p{color:var(--color-text-secondary);line-height:1.6}@media (max-width: 768px){.hero-title{font-size:2.5rem}.hero-actions{flex-direction:column}.hero-stats{flex-direction:column;gap:1.5rem}}.optimizer-page.dark{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-tertiary: #293548;--bg-hover: #334155;--text-primary: #f1f5f9;--text-secondary: #cbd5e1;--text-tertiary: #94a3b8;--border-color: #334155;--accent-primary: #6366f1;--accent-hover: #4f46e5;--success-color: #10b981;--error-color: #ef4444;--shadow: rgba(0, 0, 0, .3);--shadow-lg: rgba(0, 0, 0, .5)}.optimizer-page.light{--bg-primary: #ffffff;--bg-secondary: #f8fafc;--bg-tertiary: #f1f5f9;--bg-hover: #e2e8f0;--text-primary: #0f172a;--text-secondary: #475569;--text-tertiary: #64748b;--border-color: #e2e8f0;--accent-primary: #6366f1;--accent-hover: #4f46e5;--success-color: #10b981;--error-color: #ef4444;--shadow: rgba(0, 0, 0, .1);--shadow-lg: rgba(0, 0, 0, .15)}.optimizer-page{min-height:100vh;background:var(--bg-primary);padding-top:80px;transition:background-color .3s ease}.optimizer-container{display:flex;height:calc(100vh - 80px);overflow:hidden}.sidebar{width:360px;background:var(--bg-secondary);border-right:1px solid var(--border-color);display:flex;flex-direction:column;overflow:hidden;flex-shrink:0;transition:all .3s ease}.sidebar-header{padding:20px 24px;border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;flex-shrink:0}.sidebar-header h2{font-size:18px;font-weight:600;color:var(--text-primary);margin:0}.badge{background:var(--accent-primary);color:#fff;padding:4px 10px;border-radius:12px;font-size:13px;font-weight:600;min-width:28px;text-align:center;box-shadow:0 2px 8px #6366f14d}.mode-selector{padding:16px 24px;display:flex;gap:10px;border-bottom:1px solid var(--border-color);flex-shrink:0}.mode-btn{flex:1;padding:10px 14px;background:var(--bg-tertiary);border:1.5px solid var(--border-color);border-radius:8px;color:var(--text-secondary);font-size:13px;font-weight:600;cursor:pointer;transition:all .2s ease}.mode-btn:hover{border-color:var(--accent-primary);background:var(--bg-hover);transform:translateY(-1px)}.mode-btn.active{background:var(--accent-primary);border-color:var(--accent-primary);color:#fff;box-shadow:0 4px 12px #6366f14d}.search-box{padding:16px 24px;border-bottom:1px solid var(--border-color);flex-shrink:0}.search-box input{width:100%;padding:10px 14px;background:var(--bg-tertiary);border:1.5px solid var(--border-color);border-radius:8px;color:var(--text-primary);font-size:13px;outline:none;transition:all .2s ease}.search-box input:focus{border-color:var(--accent-primary);background:var(--bg-primary);box-shadow:0 0 0 3px #6366f11a}.search-box input:disabled{opacity:.5;cursor:not-allowed}.search-box input::placeholder{color:var(--text-tertiary)}.locations-list{flex:1;overflow-y:auto;padding:12px 20px;min-height:0}.full-mode-message{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px 20px;gap:16px;color:var(--text-secondary)}.full-mode-message svg{color:var(--accent-primary);opacity:.6}.full-mode-message h3{font-size:16px;font-weight:600;color:var(--text-primary);margin:0}.full-mode-message p{font-size:13px;line-height:1.6;margin:0}.location-item{display:flex;align-items:center;gap:12px;padding:12px 14px;margin-bottom:8px;background:var(--bg-tertiary);border:1.5px solid var(--border-color);border-radius:8px;cursor:pointer;transition:all .2s ease;-webkit-user-select:none;user-select:none}.location-item:hover{background:var(--bg-hover);border-color:var(--accent-primary);transform:translate(4px)}.location-item.selected{background:linear-gradient(135deg,#6366f126,#8b5cf626);border-color:var(--accent-primary)}.checkbox{width:18px;height:18px;border:2px solid var(--border-color);border-radius:5px;display:flex;align-items:center;justify-content:center;font-size:11px;color:#fff;transition:all .2s ease;flex-shrink:0}.location-item.selected .checkbox{background:var(--accent-primary);border-color:var(--accent-primary)}.location-name{flex:1;font-size:13px;font-weight:500;color:var(--text-primary)}.order-badge{width:22px;height:22px;background:linear-gradient(135deg,#10b981,#059669);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:#fff;flex-shrink:0;box-shadow:0 2px 6px #10b9814d}.sidebar-actions{padding:16px 24px;border-top:1px solid var(--border-color);display:flex;gap:10px;flex-shrink:0}.btn-compute{flex:1;padding:12px 20px;background:var(--accent-primary);border:none;border-radius:8px;color:#fff;font-size:14px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;transition:all .2s ease}.btn-compute:hover:not(:disabled){background:var(--accent-hover);transform:translateY(-2px);box-shadow:0 6px 16px #6366f14d}.btn-compute:active:not(:disabled){transform:translateY(0)}.btn-compute:disabled{opacity:.5;cursor:not-allowed}.btn-clear{padding:12px 16px;background:var(--bg-tertiary);border:1.5px solid var(--border-color);border-radius:8px;color:var(--text-secondary);cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center}.btn-clear:hover:not(:disabled){background:var(--bg-hover);border-color:var(--accent-primary);color:var(--accent-primary)}.btn-clear:disabled{opacity:.5;cursor:not-allowed}.main-area{flex:1;position:relative;background:var(--bg-tertiary);overflow:hidden;min-width:0}.empty-state{width:100%;height:100%;position:relative}.empty-overlay{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:16px;pointer-events:none;z-index:1;padding:20px}.empty-overlay svg{color:var(--text-tertiary);opacity:.4}.empty-overlay h3{font-size:22px;font-weight:600;color:var(--text-primary);margin:0}.empty-overlay p{font-size:15px;color:var(--text-secondary);line-height:1.6;margin:0;max-width:400px}.status-overlay{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;align-items:center;justify-content:center;background:#00000080;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:100}.status-box{background:var(--bg-secondary);border:1.5px solid var(--border-color);border-radius:16px;padding:40px 50px;text-align:center;box-shadow:0 20px 40px var(--shadow-lg);min-width:300px;max-width:400px}.status-box h3{font-size:20px;font-weight:600;margin:16px 0 8px;color:var(--text-primary)}.status-box p{font-size:14px;color:var(--text-secondary);margin:0;line-height:1.5}.spinner{width:48px;height:48px;border:4px solid var(--border-color);border-top-color:var(--accent-primary);border-radius:50%;animation:spin .8s linear infinite;margin:0 auto}@keyframes spin{to{transform:rotate(360deg)}}.error-box{border-color:var(--error-color)}.error-icon{font-size:48px;margin-bottom:8px}.error-box h3{color:var(--error-color)}.error-box button{margin-top:16px;padding:10px 24px;background:var(--error-color);border:none;border-radius:8px;color:#fff;font-weight:600;cursor:pointer;transition:all .2s ease}.error-box button:hover{background:#dc2626;transform:translateY(-1px)}.result-layout{width:100%;height:100%;display:flex;flex-direction:column;overflow:hidden}.graph-section{height:55%;min-height:320px;background:var(--bg-tertiary);overflow:hidden;flex-shrink:0}.result-panel{flex:1;background:var(--bg-secondary);border-top:2px solid var(--border-color);display:flex;flex-direction:column;overflow:hidden;box-shadow:0 -4px 12px var(--shadow)}.result-header{padding:14px 24px;border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;gap:20px;flex-shrink:0}.success-badge{display:flex;align-items:center;gap:12px}.success-icon{width:38px;height:38px;background:linear-gradient(135deg,var(--success-color),#059669);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;font-weight:700;flex-shrink:0;box-shadow:0 4px 12px #10b9814d}.success-badge h3{font-size:15px;font-weight:600;color:var(--text-primary);margin:0 0 2px}.success-badge p{font-size:12px;color:var(--accent-primary);margin:0;font-weight:600}.stats-grid{display:flex;gap:24px}.stat-item{display:flex;flex-direction:column;align-items:flex-end;gap:2px}.stat-item .stat-label{font-size:10px;font-weight:600;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.5px}.stat-item .stat-value{font-size:17px;font-weight:700;color:var(--accent-primary)}.result-body{flex:1;padding:14px 24px 16px;overflow:hidden;display:flex;flex-direction:column;gap:10px;min-height:0}.path-header{display:flex;align-items:center;justify-content:space-between;flex-shrink:0}.path-header h4{font-size:13px;font-weight:600;color:var(--text-primary);margin:0}.path-count{font-size:11px;font-weight:600;color:var(--text-tertiary);background:var(--bg-tertiary);padding:3px 9px;border-radius:10px}.path-horizontal-scroll{flex:1;overflow-x:auto;overflow-y:hidden;min-height:0;padding-bottom:4px}.path-horizontal{display:flex;align-items:center;gap:0;min-width:min-content;padding:10px 0}.path-node{display:flex;flex-direction:column;align-items:center;gap:8px;min-width:130px;flex-shrink:0}.node-circle{width:38px;height:38px;border-radius:50%;background:var(--bg-tertiary);border:2.5px solid var(--border-color);display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;color:var(--text-primary);transition:all .2s ease}.node-circle.requested{background:linear-gradient(135deg,var(--accent-primary),#4f46e5);border-color:var(--accent-primary);color:#fff;box-shadow:0 4px 12px #6366f14d}.node-info{display:flex;flex-direction:column;align-items:center;gap:5px;text-align:center}.node-name{font-size:12px;font-weight:600;color:var(--text-primary);max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.path-node.requested .node-name{color:var(--accent-primary)}.node-tags{display:flex;gap:4px;flex-wrap:wrap;justify-content:center}.node-tag{padding:2px 6px;border-radius:4px;font-size:9px;font-weight:600;text-transform:uppercase;letter-spacing:.3px;white-space:nowrap}.node-tag.start{background:#10b98126;color:var(--success-color);border:1px solid rgba(16,185,129,.3)}.node-tag.end{background:#6366f126;color:var(--accent-primary);border:1px solid rgba(99,102,241,.3)}.node-tag.destination{background:#6366f126;color:var(--accent-primary);border:1px solid rgba(99,102,241,.35)}.node-tag.via{background:#6b72801a;color:var(--text-tertiary);border:1px solid rgba(107,114,128,.2)}.path-arrow{display:flex;align-items:center;justify-content:center;color:var(--accent-primary);margin:0 -10px;z-index:1}.locations-list::-webkit-scrollbar,.path-horizontal-scroll::-webkit-scrollbar{width:6px;height:6px}.locations-list::-webkit-scrollbar-track,.path-horizontal-scroll::-webkit-scrollbar-track{background:transparent}.locations-list::-webkit-scrollbar-thumb,.path-horizontal-scroll::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}.locations-list::-webkit-scrollbar-thumb:hover,.path-horizontal-scroll::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}@media (max-width: 1200px){.sidebar{width:340px}.graph-section{height:50%;min-height:300px}}@media (max-width: 768px){.optimizer-page{padding-top:70px}.optimizer-container{flex-direction:column;height:calc(100vh - 70px)}.sidebar{width:100%;max-height:45vh;border-right:none;border-bottom:1px solid var(--border-color)}.graph-section{height:40%;min-height:250px}.result-header{flex-direction:column;align-items:flex-start;gap:12px}.stats-grid{width:100%;justify-content:space-between}.stat-item{align-items:center}.path-node{min-width:110px}.node-name{font-size:11px;max-width:100px}}@media (max-width: 480px){.path-node{min-width:100px}.node-circle{width:34px;height:34px;font-size:13px}.node-name{font-size:10px;max-width:90px}}.algorithms{padding-top:70px;min-height:100vh}.algorithms-header{text-align:center;padding:3rem 2rem 2rem}.algorithms-header h1{font-size:3rem;margin-bottom:.75rem}.algorithms-header p{font-size:1.125rem;color:var(--color-text-secondary)}.mode-explanation{max-width:1200px;margin:0 auto 3rem;padding:0 2rem}.mode-explanation h2{font-size:1.75rem;text-align:center;margin-bottom:2rem}.mode-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.5rem}.mode-card{padding:1.5rem;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg)}.mode-card h3{font-size:1.125rem;margin-bottom:.75rem;color:var(--color-primary)}.mode-card p{font-size:.9375rem;color:var(--color-text-secondary);line-height:1.6}.algorithms-grid{max-width:1400px;margin:0 auto;padding:0 2rem 4rem;display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:2rem}.algo-card{padding:2rem;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);transition:all var(--transition)}.algo-card:hover{box-shadow:var(--shadow-lg);border-color:var(--color-primary)}.algo-icon{width:64px;height:64px;display:flex;align-items:center;justify-content:center;background:var(--color-bg-secondary);color:var(--color-primary);border-radius:var(--radius-md);margin-bottom:1.5rem}.algo-card h3{font-size:1.25rem;margin-bottom:1rem}.algo-meta{margin-bottom:1rem}.complexity{display:inline-block;padding:.25rem .75rem;background:var(--color-bg-secondary);color:var(--color-text-secondary);font-size:.875rem;font-family:Courier New,monospace;border-radius:.25rem}.algo-use{color:var(--color-primary);font-weight:600;margin-bottom:.75rem;font-size:.9375rem}.algo-description{color:var(--color-text-secondary);margin-bottom:1.5rem;line-height:1.6;font-size:.9375rem}.algo-features{list-style:none;display:flex;flex-direction:column;gap:.5rem}.algo-features li{position:relative;padding-left:1.5rem;color:var(--color-text-secondary);font-size:.9375rem}.algo-features li:before{content:"✓";position:absolute;left:0;color:var(--color-success);font-weight:700}.about{padding-top:70px;min-height:100vh}.about-header{text-align:center;padding:3rem 2rem 2rem}.about-header h1{font-size:3rem;margin-bottom:.75rem}.about-header p{font-size:1.125rem;color:var(--color-text-secondary)}.about-content{max-width:1200px;margin:0 auto;padding:0 2rem 4rem}.about-section{margin-bottom:3rem;padding:2rem;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg)}.about-section h2{font-size:2rem;margin-bottom:1rem}.about-section p{color:var(--color-text-secondary);line-height:1.7;font-size:1.0625rem}.tech-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:2rem;margin-bottom:3rem}.tech-card{padding:2rem;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);text-align:center}.tech-card svg{color:var(--color-primary);margin-bottom:1rem}.tech-card h3{font-size:1.25rem;margin-bottom:1rem}.tech-card ul{list-style:none;display:flex;flex-direction:column;gap:.5rem}.tech-card li{color:var(--color-text-secondary);font-size:.9375rem}.features-section{padding:2rem;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);margin-bottom:3rem}.features-section h2{font-size:2rem;margin-bottom:2rem}.features-list{display:grid;gap:1.5rem}.feature-item h3{font-size:1.125rem;margin-bottom:.5rem;color:var(--color-primary)}.feature-item p{color:var(--color-text-secondary);line-height:1.6}.cta-section{text-align:center;padding:3rem 2rem;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg)}.cta-section svg{color:var(--color-primary);margin-bottom:1.5rem}.cta-section h2{font-size:2rem;margin-bottom:1rem}.cta-section p{color:var(--color-text-secondary);margin-bottom:2rem;font-size:1.0625rem}.github-btn{display:inline-flex;align-items:center;gap:.5rem;padding:1rem 2rem;background:var(--color-primary);color:#fff;font-weight:600;border-radius:var(--radius-md);transition:all var(--transition)}.github-btn:hover{background:var(--color-primary-dark);transform:translateY(-2px);box-shadow:var(--shadow-lg)}:root{--color-bg: #ffffff;--color-bg-secondary: #f8fafc;--color-bg-tertiary: #f1f5f9;--color-surface: #ffffff;--color-border: #e2e8f0;--color-text: #0f172a;--color-text-secondary: #475569;--color-text-tertiary: #94a3b8;--color-primary: #6366f1;--color-primary-light: #818cf8;--color-primary-dark: #4f46e5;--color-success: #10b981;--color-danger: #ef4444;--color-warning: #f59e0b;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1);--radius-sm: .5rem;--radius-md: .75rem;--radius-lg: 1rem;--transition: .2s ease}.dark{--color-bg: #0f172a;--color-bg-secondary: #1e293b;--color-bg-tertiary: #334155;--color-surface: #1e293b;--color-border: #334155;--color-text: #f1f5f9;--color-text-secondary: #cbd5e1;--color-text-tertiary: #94a3b8;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .3);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .4);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .5)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.6;color:var(--color-text);background:var(--color-bg);transition:background .3s,color .3s}h1,h2,h3,h4,h5,h6{line-height:1.2;font-weight:700}a{text-decoration:none;color:inherit}button{font-family:inherit;cursor:pointer;border:none;outline:none}