:root{--text-xs:12px;--text-sm:14px;--text-base:16px;--text-lg:20px;--text-xl:25px;--text-2xl:31px;--color-brand:#0f766e;--color-brand-accent:#14b8a6;--color-bg:#f8fafc;--color-surface:#fff;--color-border:#e2e8f0;--color-text:#0f172a;--color-text-muted:#64748b;--color-success:#16a34a;--color-warning:#d97706;--color-danger:#dc2626;--color-info:#2563eb;--shadow-sm:0 1px 2px #0f172a0f;--shadow-md:0 4px 12px #0f172a14;--shadow-lg:0 12px 24px #0f172a29;--surface-glass:#ffffffb8;--radius-md:16px;--chart-elevation:#78716c;--chart-power:#f59e0b;--chart-heart-rate:#e11d48;--chart-speed:#0284c7;--chart-cadence:#7c3aed;--chart-ctl:#0f766e;--chart-atl:#d97706;--chart-tsb:#64748b}*{box-sizing:border-box}body{background:var(--color-bg);color:var(--color-text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:var(--text-base);margin:0;line-height:1.5}h1,h2,h3{line-height:1.2}button{font:inherit}.btn{font-size:var(--text-base);cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;gap:.5rem;padding:.625rem 1.25rem;font-weight:600;transition:box-shadow .15s,transform .15s;display:inline-flex}.btn:disabled{cursor:default;opacity:.6}.btn-primary{background:var(--color-brand);color:#fff;box-shadow:var(--shadow-sm)}.btn-primary:not(:disabled):hover{box-shadow:var(--shadow-md);transform:translateY(-1px)}.btn-secondary{background:color-mix(in srgb, var(--color-brand) 10%, transparent);color:var(--color-brand)}.btn-secondary:not(:disabled):hover{background:color-mix(in srgb, var(--color-brand) 16%, transparent)}.input{background:var(--color-bg);width:100%;font-size:var(--text-base);color:var(--color-text);border:none;border-radius:10px;padding:.625rem .875rem;display:block}.input:focus{box-shadow:0 0 0 3px color-mix(in srgb, var(--color-brand) 25%, transparent);outline:none}.card{background:var(--color-surface);border-radius:var(--radius-md);box-shadow:var(--shadow-md);padding:1.5rem}