:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;min-width:320px;min-height:100vh;background-color:#f5f5f5;color:#333}@media (prefers-color-scheme: dark){body{background-color:#1a1a1a;color:#e0e0e0}}*{box-sizing:border-box}.app{max-width:800px;margin:0 auto;padding:2rem;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.6;color:#333}@media (prefers-color-scheme: dark){.app{color:#e0e0e0}}.header{text-align:center;margin-bottom:3rem}.header h1{margin:0 0 .5rem;font-size:2.5rem;font-weight:700;color:#2c3e50}.header p{margin:0;font-size:1.1rem;color:#666}@media (prefers-color-scheme: dark){.header h1{color:#74b9ff}.header p{color:#b0b0b0}}.controls{background:#f8f9fa;border-radius:12px;padding:2rem;margin-bottom:2rem;border:1px solid #e9ecef}@media (prefers-color-scheme: dark){.controls{background:#2d3748;border-color:#4a5568}}.input-group{margin-bottom:1.5rem}.input-group label{display:block;margin-bottom:.5rem;font-weight:600;color:#2c3e50}.time-input{width:100%;max-width:200px;padding:.75rem;border:2px solid #ddd;border-radius:8px;font-size:1.1rem;font-family:Courier New,monospace;transition:border-color .2s ease;background:#fff;color:#333}.time-input:focus{outline:none;border-color:#3498db;box-shadow:0 0 0 3px #3498db1a}.toggle-group{display:flex;gap:1rem;margin-bottom:1rem}.toggle-label{display:flex;align-items:center;gap:.5rem;cursor:pointer;font-weight:500;color:#2c3e50}.toggle-label input[type=radio]{width:18px;height:18px;accent-color:#3498db}@media (prefers-color-scheme: dark){.input-group label,.toggle-label{color:#e0e0e0}.time-input{background:#4a5568;border-color:#718096;color:#e0e0e0}.time-input:focus{border-color:#74b9ff;box-shadow:0 0 0 3px #74b9ff33}}.results{background:#fff;border-radius:12px;padding:2rem;border:1px solid #e9ecef;box-shadow:0 2px 8px #0000001a}.results h2{margin:0 0 1.5rem;font-size:1.8rem;color:#2c3e50;text-align:center}.info-note{background:#e8f4f8;border:1px solid #bee5eb;border-radius:8px;padding:1rem;margin-bottom:1.5rem;color:#0c5460}.info-note p{margin:0;font-size:.9rem}@media (prefers-color-scheme: dark){.results{background:#2d3748;border-color:#4a5568;box-shadow:0 2px 8px #0000004d}.results h2{color:#74b9ff}.info-note{background:#1a365d;border-color:#2c5282;color:#e2e8f0}}.pace-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1rem}.pace-item{display:flex;justify-content:space-between;align-items:center;padding:1rem;background:#f8f9fa;border-radius:8px;border-left:4px solid #3498db}.pace-label{font-weight:600;color:#2c3e50;flex:1}.pace-value{font-family:Courier New,monospace;font-size:1.1rem;font-weight:700;color:#e74c3c;background:#fff;padding:.5rem .75rem;border-radius:6px;border:1px solid #ddd}@media (prefers-color-scheme: dark){.pace-item{background:#4a5568;border-left-color:#74b9ff}.pace-label{color:#e0e0e0}.pace-value{background:#1a202c;border-color:#718096;color:#f56565}}.copy-button{margin-top:1.5rem;padding:.75rem 1.5rem;background:#74b9ff;color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease;width:100%;max-width:300px;display:block;margin-left:auto;margin-right:auto}.copy-button:hover{background:#0984e3;transform:translateY(-1px)}.copy-button:active{transform:translateY(0)}.copy-button:disabled{background:#ddd;cursor:not-allowed;transform:none}@media (prefers-color-scheme: dark){.copy-button{background:#4a90e2}.copy-button:hover{background:#357abd}.copy-button:disabled{background:#444;color:#888}}.error{background:#ffe6e6;border:1px solid #ffcccc;border-radius:8px;padding:1.5rem;color:#d32f2f;text-align:center}.error p{margin:.5rem 0}@media (prefers-color-scheme: dark){.error{background:#742a2a;border-color:#c53030;color:#fed7d7}}@media (max-width: 768px){.app{padding:1rem}.header h1{font-size:2rem}.controls{padding:1.5rem}.pace-grid{grid-template-columns:1fr}.pace-item{flex-direction:column;gap:.5rem;text-align:center}.pace-label{flex:none}}