:root{--ground:#e9e9e6;--surface:#fbfbf9;--card:#ffffff;--border:#e8e8e3;--ink:#17171a;--muted:#63636b;--faint:#73737b;--shadow:0 1px 2px rgba(23,23,26,0.05),0 4px 16px rgba(23,23,26,0.04);--blue:#1d4fd7;--green:#157347;--amber:#b45309;--red:#c2272e;--chart-emphasis:#2a78d6;--chart-context:#dcdcd7;--sleep-deep:#1d5fae;--sleep-rem:#63a1ec;--sleep-light:#d9d9d4;--meter-track:#dbe7f8;--sans:system-ui,-apple-system,"Segoe UI",sans-serif;--serif:Georgia,"Times New Roman",serif}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--ground);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}button,input,select,textarea{font:inherit;color:inherit}a{color:inherit}.app-surface{max-width:1080px;margin:0 auto;min-height:100dvh;background:var(--surface);border-radius:24px;padding:20px 24px 96px}@media (max-width:640px){.app-surface{border-radius:0;padding:14px 14px 96px;min-height:100dvh}}.card{background:var(--card);border:1px 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solid var(--border);border-top-color:var(--ink);animation:spin .8s linear infinite;display:inline-block;vertical-align:middle}@keyframes spin{to{transform:rotate(1turn)}}.empty{text-align:center;color:var(--muted);padding:36px 16px;font-size:14px}.empty .glyph{font-size:28px;display:block;margin-bottom:8px}