:root{--color-primary: #1a1a2e;--color-primary-light: #16213e;--color-primary-border: #0f3460;--color-accent: #e94560;--color-accent-secondary: #00bcd4;--color-success: #4caf50;--color-success-hover: #43a047;--color-danger: #f44336;--color-danger-hover: #d32f2f;--color-warning: #ff9800;--color-warning-hover: #f57c00;--color-info: #2196f3;--color-info-hover: #1976d2;--color-bg: #f4f4f4;--color-surface: #fff;--color-surface-alt: #f5f5f5;--color-surface-dark: #0f0f1e;--color-border: #e0e0e0;--color-border-light: #eee;--color-text: #333;--color-text-muted: #555;--color-text-light: #666;--color-text-lighter: #777;--font-mono: "Courier New", Courier, monospace;--font-sans: "Segoe UI", Arial, sans-serif;--radius-sm: 4px;--radius-md: 6px;--radius-lg: 8px}*{box-sizing:border-box}body{font-family:var(--font-sans);line-height:1.6;margin:0;padding:0;background-color:var(--color-bg);color:var(--color-text);display:flex;flex-direction:column;min-height:100vh}main{flex:1}button:focus-visible,[role=switch]:focus-visible,[role=radiogroup] button:focus-visible,a:focus-visible,input[type=range]:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.hidden{display:none!important}.skip-link{position:absolute;top:-100%;left:50%;transform:translate(-50%);z-index:1000;padding:8px 16px;background:var(--color-accent);color:#fff;font-weight:600;font-size:.9rem;text-decoration:none;border-radius:0 0 var(--radius-sm) var(--radius-sm);transition:top .15s}.skip-link:focus{top:0;outline:2px solid #fff;outline-offset:2px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}header{background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-primary-light) 50%,var(--color-primary-border) 100%);color:#fff;padding:1.5rem 0;text-align:center}header h1{margin:0;font-size:1.8rem;letter-spacing:-.02em;font-weight:700}header p{margin:.5rem 0 0;opacity:.7;font-size:.95rem;letter-spacing:.02em}nav{background-color:var(--color-primary-light);padding:0;display:flex;justify-content:center;gap:0;border-bottom:2px solid var(--color-primary-border)}nav a{color:#ccc;text-decoration:none;padding:.75rem 1.5rem;font-size:.95rem;transition:background-color .2s,color .2s;border-bottom:2px solid transparent;margin-bottom:-2px}nav a:hover{background-color:var(--color-primary-border);color:#fff}nav a.active{color:#fff;border-bottom-color:var(--color-accent);font-weight:600;background-color:var(--color-primary-border)}main{padding:20px;max-width:960px;margin:20px auto;background-color:var(--color-surface);box-shadow:0 0 10px #0000001a;border-radius:var(--radius-sm)}section{margin-bottom:20px;padding-bottom:20px;border-bottom:1px solid var(--color-border-light)}section:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}h2{color:var(--color-primary);margin-top:0;letter-spacing:-.01em}h3{color:#444;letter-spacing:-.01em}ul,ol{margin-left:20px}.section-nav{display:flex;gap:16px;padding:8px 0;margin-bottom:12px;border-bottom:1px solid var(--color-border-light);font-size:.9rem}.section-nav a{color:var(--color-info);text-decoration:none;font-weight:600}.section-nav a:hover{text-decoration:underline}.explanation-box{background-color:#e7f3fe;border-left:6px solid var(--color-info);margin:20px 0;padding:10px 20px;border-radius:0 var(--radius-sm) var(--radius-sm) 0}.explanation-box h4{margin-top:0;color:var(--color-info)}.explanation-box.simple-terms{background-color:#fff8e1;border-left-color:var(--color-warning)}.explanation-box.simple-terms h4{color:#e65100}footer{text-align:center;padding:20px 16px;background-color:var(--color-primary);color:#fff;margin-top:20px;font-size:.9rem}footer>p{margin:0 0 12px}footer a{color:var(--color-accent);text-decoration:none}footer a:hover{text-decoration:underline}.site-version{margin:12px 0 0;font-size:.75rem;opacity:.5}.footer-nav{display:flex;justify-content:center;gap:0}.footer-nav a{color:#ccc;padding:10px 20px;font-size:.9rem;border-radius:var(--radius-sm);transition:background-color .15s,color .15s}.footer-nav a:hover{color:#fff;background-color:#ffffff1a;text-decoration:none}.sim-config{display:flex;flex-wrap:wrap;gap:16px;align-items:center;margin-bottom:12px;padding:12px 16px;background:var(--color-surface-alt);border-radius:var(--radius-md);border:1px solid var(--color-border)}.config-group{display:flex;align-items:center;gap:10px}.config-group>label{font-weight:600;font-size:.9rem;color:var(--color-text-muted);white-space:nowrap}[role=radiogroup]{display:flex;gap:4px;background:#e8e8ee;border-radius:var(--radius-lg);padding:3px;touch-action:manipulation}.seg-btn{padding:8px 16px;border:2px solid transparent;background:transparent;cursor:pointer;font-size:.85rem;font-weight:600;color:var(--color-text-light);transition:background .15s,color .15s,border-color .15s,box-shadow .15s,opacity .15s;border-radius:var(--radius-md);touch-action:manipulation}.seg-btn:active{opacity:.7}.seg-btn.active{background:var(--color-accent);color:#fff;border-color:var(--color-accent);box-shadow:0 2px 8px #e9456059}.seg-btn:not(.active):active{background:#00000014}.control-buttons{display:flex;gap:8px}.ctrl-btn{padding:8px 18px;border:none;border-radius:var(--radius-sm);cursor:pointer;font-size:.9rem;font-weight:600;color:#fff;transition:background-color .15s;touch-action:manipulation}.ctrl-btn.play{background:var(--color-success)}.ctrl-btn.play:hover{background:var(--color-success-hover)}.ctrl-btn.pause{background:var(--color-warning)}.ctrl-btn.pause:hover{background:var(--color-warning-hover)}.ctrl-btn.step{background:var(--color-info)}.ctrl-btn.step:hover{background:var(--color-info-hover)}.ctrl-btn.reset{background:var(--color-danger)}.ctrl-btn.reset:hover{background:var(--color-danger-hover)}.ctrl-btn:disabled{opacity:.5;cursor:not-allowed}.speed-control{display:flex;align-items:center;gap:8px;margin-left:auto}.speed-control label{font-size:.85rem;font-weight:600;color:var(--color-text-muted)}.speed-control input[type=range]{width:100px;accent-color:var(--color-primary)}.speed-label{font-size:.8rem;color:var(--color-text-lighter);min-width:45px}.keyboard-hint{font-size:.8rem;color:var(--color-text-lighter);margin-top:4px}.keyboard-hint kbd{display:inline-block;padding:1px 6px;border:1px solid #ccc;border-radius:3px;background:var(--color-surface-alt);font-family:var(--font-mono);font-size:.75rem}.further-reading{margin-top:20px;padding:16px 20px;background:var(--color-surface-alt);border-radius:var(--radius-md);border:1px solid var(--color-border)}.further-reading h3{margin-top:0;font-size:1rem}.further-reading ul{margin:8px 0 0;padding-left:20px}.further-reading li{margin-bottom:4px;font-size:.9rem}.further-reading a{color:var(--color-info);text-decoration:none}.further-reading a:hover{text-decoration:underline}.cross-link{font-size:.9rem;margin:8px 0 16px}.cross-link a{color:var(--color-accent-secondary);text-decoration:none;font-weight:600}.cross-link a:hover{text-decoration:underline}.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(280px,100%),1fr));gap:24px;padding:10px 0}.card{display:block;background:var(--color-surface);border:1px solid var(--color-border);border-top:3px solid var(--color-accent);border-radius:var(--radius-lg);padding:24px;text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s,border-color .2s}.card:nth-child(2){border-top-color:var(--color-accent-secondary)}.card:hover{transform:translateY(-3px);box-shadow:0 8px 24px #0000001f}.card-icon{font-size:2rem;margin-bottom:8px;display:block;line-height:1}.card h2{margin:0 0 8px;font-size:1.25rem;color:var(--color-primary)}.card p{margin:0;color:var(--color-text-light);font-size:.95rem;line-height:1.5}.card .card-tag{display:inline-block;margin-top:12px;padding:3px 10px;border-radius:12px;font-size:.8rem;font-weight:600}.card:nth-child(1) .card-tag{background-color:#e945601a;color:var(--color-accent)}.card:nth-child(2) .card-tag{background-color:#00bcd41a;color:#00838f}.trace-header{display:flex;justify-content:space-between;align-items:center;padding:6px 12px;background:#0a0a16;border:1px solid #1a1a3e;border-radius:var(--radius-md) var(--radius-md) 0 0;color:#9ab;font-size:.85rem}.trace-toggle-btn{background:none;border:none;color:#667;font-size:.8rem;cursor:pointer;padding:2px 6px}.trace-toggle-btn:hover{color:#9ab}.trace-log{max-height:160px;overflow-y:auto;background:#08080f;border:1px solid #1a1a3e;border-top:none;border-radius:0 0 var(--radius-md) var(--radius-md);padding:8px 12px;font-family:var(--font-mono);font-size:.8rem}.trace-entry{padding:2px 0;color:#889;border-bottom:1px solid #111}.trace-entry:last-child{border-bottom:none}.trace-step{color:var(--color-accent);font-weight:700;margin-right:8px;min-width:24px;display:inline-block}@media (max-width: 640px){header h1{font-size:1.4rem}nav{flex-wrap:wrap}nav a{padding:.75rem 1rem;font-size:.85rem;flex:1;text-align:center;min-height:44px;display:flex;align-items:center;justify-content:center}main{margin:10px;padding:15px}.sim-config{flex-direction:column;gap:8px}.config-group{flex-wrap:wrap}[role=radiogroup]{width:100%}.seg-btn{padding:10px 8px;font-size:.9rem;min-height:44px;flex:1;text-align:center}.ctrl-btn{padding:12px 20px;min-height:44px}.speed-control{margin-left:0}.section-nav{flex-wrap:wrap;gap:8px}.section-nav a{padding:8px 12px;min-height:44px;display:inline-flex;align-items:center}.keyboard-hint{display:none}.card:hover{transform:none}.footer-nav{flex-direction:column;gap:0}.footer-nav a{padding:12px 20px;min-height:44px;display:flex;align-items:center;justify-content:center}}