:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;--background:#fff;--surface:#f5f5f7;--text:#1d1d1f;--text-muted:#6e6e73;--accent:#e5484d;--chart-line:#e5484d;--chart-band:#e5484d2e;--chart-grid:#00000014;--warning-background:#b42318}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial;--background:#111113;--surface:#1c1c1f;--text:#ededef;--text-muted:#a0a0a8;--accent:#ff6369;--chart-line:#ff6369;--chart-band:#ff636938;--chart-grid:#ffffff1a}}body{background:var(--background);color:var(--text);margin:0;font-family:system-ui,-apple-system,Hiragino Sans,sans-serif}.heart-rate-page{box-sizing:border-box;max-width:960px;margin:0 auto;padding:24px 16px}h1{margin:0 0 16px;font-size:1.5rem}.range-tabs{flex-wrap:wrap;gap:8px;margin-bottom:16px;display:flex}.range-tabs a{background:var(--surface);color:var(--text-muted);border-radius:999px;padding:6px 12px;text-decoration:none}.range-tabs a[aria-current=page]{background:var(--accent);color:#fff}.stats{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin:0 0 16px;display:grid}.stats div{background:var(--surface);border-radius:12px;padding:12px 16px}.stats dt{color:var(--text-muted);font-size:.85rem}.stats dd{font-variant-numeric:tabular-nums;margin:4px 0 0;font-size:1.5rem;font-weight:600}.chart-container{height:min(60vh,420px);position:relative}.empty-message{color:var(--text-muted)}.alive-warning{background:var(--warning-background);color:#fff;border-radius:12px;margin:0 0 16px;padding:12px 16px;font-weight:600}