:root{color-scheme:dark;--bg:#111827;--panel:#1f2937;--line:#374151;--ink:#f9fafb;--muted:#9ca3af;--accent:#38bdf8}*{box-sizing:border-box}body{min-width:320px;margin:0;background:radial-gradient(circle at 50% -25%,#334155,transparent 50%),var(--bg);color:var(--ink);font-family:"Noto Sans JP",sans-serif}.app-shell{width:min(100% - 40px,560px);margin:0 auto;padding:clamp(56px,12vh,112px) 0 56px;text-align:center}.eyebrow{margin:0;color:var(--accent);font:500 11px "DM Mono",monospace;letter-spacing:.18em}.app-shell>h1{margin:12px 0 38px;font-size:clamp(28px,7vw,38px);letter-spacing:-.06em}.stopwatch,.laps{border:1px solid var(--line);border-radius:24px;background:#111827b8;box-shadow:0 18px 50px #0004}.stopwatch{padding:clamp(34px,8vw,52px) 24px}.display{display:block;font:500 clamp(44px,13vw,76px)/1 "DM Mono",monospace;letter-spacing:-.09em;font-variant-numeric:tabular-nums}.controls{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:10px;margin-top:38px}.controls button{min-height:46px;border:1px solid var(--line);border-radius:12px;color:var(--ink);font:600 14px "Noto Sans JP",sans-serif;cursor:pointer;transition:transform .15s,background .15s}.controls button:active{transform:scale(.97)}.primary{border-color:var(--accent)!important;background:var(--accent)!important;color:#082f49!important}.secondary{background:#273449}.secondary:disabled{opacity:.4;cursor:not-allowed}.laps{margin-top:22px;padding:19px 20px;text-align:left}.laps-heading{display:flex;align-items:center;justify-content:space-between}.laps h2{margin:0;font-size:14px}.laps-heading span,.hint{color:var(--muted);font:12px "DM Mono",monospace}.laps ol{max-height:238px;margin:14px 0 0;padding:0;overflow:auto;list-style:none}.laps li{display:flex;justify-content:space-between;padding:13px 2px;border-top:1px solid var(--line);font-size:13px}.laps time{font-family:"DM Mono",monospace;font-variant-numeric:tabular-nums}.laps .empty{display:block;color:var(--muted);text-align:center}.hint{margin:22px 0 0}@media (max-width:420px){.app-shell{width:min(100% - 28px,560px)}.controls{grid-template-columns:1fr}.stopwatch{padding:36px 18px}.display{font-size:52px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}