:root{--bg:#0a0a0f;--bg-card:rgba(18,18,30,0.85);--bg-surface:#12121e;--text:#e8e8f0;--text-muted:#888;--accent:#6366f1;--accent2:#a855f7;--accent-glow:rgba(99,102,241,0.3);--gradient:linear-gradient(135deg,#6366f1,#a855f7,#ec4899);--border:rgba(255,255,255,0.08);--radius:12px;--font:'Inter',sans-serif;--mono:'JetBrains Mono',monospace}
[data-theme="light"]{--bg:#f5f5fa;--bg-card:rgba(255,255,255,0.9);--bg-surface:#fff;--text:#1a1a2e;--text-muted:#666;--border:rgba(0,0,0,0.08);--accent-glow:rgba(99,102,241,0.15)}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh}
.container{max-width:1100px;margin:0 auto;padding:0 1.5rem}
.navbar{position:sticky;top:0;z-index:100;background:rgba(10,10,15,0.8);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);padding:0.75rem 0}
[data-theme="light"] .navbar{background:rgba(245,245,250,0.85)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem}
.brand{text-decoration:none;color:var(--text);font-weight:700;font-size:1.25rem;display:flex;align-items:center;gap:0.5rem}
.brand span{background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.nav-links{display:flex;gap:0.5rem;align-items:center}
.nav-links a{text-decoration:none;color:var(--text-muted);font-size:0.9rem;padding:0.4rem 0.75rem;border-radius:8px;transition:all 0.2s}
.nav-links a:hover,.nav-links a.active{color:var(--text);background:var(--accent-glow)}
.kofi-link{color:#ff5e5b !important;font-weight:600}
.theme-btn{background:none;border:1px solid var(--border);width:36px;height:36px;border-radius:50%;cursor:pointer;font-size:1.1rem;display:flex;align-items:center;justify-content:center;transition:all 0.2s}
.theme-btn:hover{border-color:var(--accent);transform:scale(1.1)}
.hero{text-align:center;padding:2rem 0 1.5rem}
.hero h1{font-size:clamp(2rem,5vw,2.75rem);font-weight:800;margin-bottom:0.5rem}
.gradient-text{background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-sub{color:var(--text-muted);font-size:1rem;max-width:500px;margin:0 auto}
.glass-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;margin-bottom:1.5rem;backdrop-filter:blur(10px)}
.mt-2{margin-top:0.5rem}.mt-3{margin-top:1rem}.mt-4{margin-top:1.5rem}
.text-muted{color:var(--text-muted)}.text-sm{font-size:0.8rem}
.btn{padding:0.6rem 1.2rem;border:none;border-radius:8px;cursor:pointer;font-family:var(--font);font-weight:600;font-size:0.85rem;transition:all 0.2s}
.btn-primary{background:var(--gradient);color:#fff}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 4px 20px var(--accent-glow)}
.btn-secondary{background:transparent;color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{border-color:var(--accent);color:var(--accent)}

.controls-bar{display:flex;gap:1rem;align-items:flex-end;flex-wrap:wrap}
.control-group{display:flex;flex-direction:column;gap:0.25rem}
.control-group label{font-size:0.7rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:0.05em}
.control-group select,.control-group input[type="text"]{padding:0.5rem;background:var(--bg-surface);border:1px solid var(--border);border-radius:6px;color:var(--text);font-size:0.85rem;outline:none}
.control-group select:focus,.control-group input:focus{border-color:var(--accent)}
.control-group input[type="range"]{width:120px;-webkit-appearance:none;height:6px;border-radius:3px;background:var(--border);cursor:pointer}
.control-group input[type="range"]::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent);cursor:pointer}
.stats-row{display:flex;gap:1.5rem;margin:0.75rem 0;font-size:0.8rem;color:var(--text-muted)}
.stats-row strong{color:var(--text);font-family:var(--mono)}

/* Sort Canvas */
.sort-canvas{display:flex;align-items:flex-end;gap:1px;height:300px;padding:1rem 0;overflow:hidden}
.sort-bar{flex:1;min-width:2px;background:var(--accent);border-radius:2px 2px 0 0;transition:height 0.05s}
.sort-bar.comparing{background:#f59e0b}
.sort-bar.swapping{background:#ef4444}
.sort-bar.sorted{background:#10b981}
.sort-bar.pivot{background:#ec4899}

/* Path Grid */
.path-grid-container{overflow:auto;margin-top:0.5rem}
.path-grid{display:grid;grid-template-columns:repeat(30,24px);gap:1px;justify-content:center}
.path-cell{width:24px;height:24px;background:var(--bg-surface);border-radius:3px;cursor:pointer;transition:background 0.1s}
.path-cell:hover{background:var(--border)}
.path-cell.wall{background:#374151}
.path-cell.start{background:#10b981}
.path-cell.end{background:#ef4444}
.path-cell.visited{background:rgba(99,102,241,0.4);animation:visitPulse 0.3s ease}
.path-cell.path{background:#f59e0b;animation:pathGlow 0.4s ease}
@keyframes visitPulse{from{transform:scale(0.3);opacity:0}to{transform:scale(1);opacity:1}}
@keyframes pathGlow{from{transform:scale(1.3)}to{transform:scale(1)}}

.legend{display:flex;gap:1rem;flex-wrap:wrap;font-size:0.75rem;color:var(--text-muted)}
.legend-item{display:flex;align-items:center;gap:4px}
.legend-color{width:14px;height:14px;border-radius:3px}

.info-section{margin:2rem 0}.info-section h2{text-align:center;margin-bottom:1.5rem}
.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}
.info-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;transition:all 0.3s}
.info-card:hover{border-color:var(--accent);transform:translateY(-3px)}
.info-card h3{font-size:1rem;margin-bottom:0.5rem}.info-card p{font-size:0.85rem;color:var(--text-muted);line-height:1.6}
.footer{margin-top:3rem;border-top:1px solid var(--border);padding:2rem 0}
.footer-inner{display:flex;flex-wrap:wrap;gap:2rem;justify-content:space-between}
.footer-brand span{font-weight:700;font-size:1.1rem}.footer-brand p{color:var(--text-muted);font-size:0.85rem;margin-top:0.3rem}
.footer-brand a{color:var(--accent);text-decoration:none}
.copyright{width:100%;text-align:center;color:var(--text-muted);font-size:0.8rem;margin-top:1rem;padding-top:1rem;border-top:1px solid var(--border)}
@media(max-width:768px){.nav-links{display:none}.controls-bar{flex-direction:column;align-items:stretch}.sort-canvas{height:200px}.path-grid{grid-template-columns:repeat(20,20px)}.path-cell{width:20px;height:20px}}

/* Algorithm Info Panel */
.algo-info-panel{padding:1rem;background:rgba(0,0,0,0.2);border-radius:10px;margin-top:0.75rem}
.algo-info-header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:0.75rem;margin-bottom:0.5rem}
.algo-info-header h3{font-size:1.1rem;font-weight:700}
.complexity-badges{display:flex;gap:0.4rem;flex-wrap:wrap}
.badge{padding:3px 10px;border-radius:20px;font-size:0.7rem;font-weight:600;letter-spacing:0.3px}
.badge-time{background:rgba(99,102,241,0.15);color:#818cf8;border:1px solid rgba(99,102,241,0.3)}
.badge-space{background:rgba(245,158,11,0.15);color:#fbbf24;border:1px solid rgba(245,158,11,0.3)}
.badge-stable{background:rgba(16,185,129,0.15);color:#34d399;border:1px solid rgba(16,185,129,0.3)}
.badge-unstable{background:rgba(239,68,68,0.15);color:#f87171;border:1px solid rgba(239,68,68,0.3)}

/* Complexity Table */
.complexity-table-wrapper{overflow-x:auto}
.complexity-table{width:100%;border-collapse:collapse;font-size:0.85rem}
.complexity-table th{text-align:left;padding:10px 12px;background:rgba(99,102,241,0.1);color:var(--accent);font-weight:600;font-size:0.75rem;text-transform:uppercase;letter-spacing:0.5px;border-bottom:2px solid var(--border)}
.complexity-table td{padding:8px 12px;border-bottom:1px solid var(--border);color:var(--text-muted)}
.complexity-table td:first-child{color:var(--text);font-weight:500}
.complexity-table tr:hover{background:rgba(99,102,241,0.05)}
.complexity-table .good{color:#34d399;font-weight:600}
.complexity-table .warn{color:#fbbf24;font-weight:600}