:root{--navy:#0a2540;--slate:#425466;--muted:#5b6d85;--faint:#8898aa;--bg:#ffffff;--bg-tint:#f6f9fc;--line:#e6ebf1;--accent:#635bff;--accent-deep:#0a2540;--ecg:#16c464;--spo2:#38bdf8;--violet:#a78bfa;--amber:#f5be2e;--shadow-sm:0 2px 5px -1px rgba(50,50,93,0.25),0 1px 3px -1px rgba(0,0,0,0.3);--shadow-md:0 6px 12px -2px rgba(50,50,93,0.25),0 3px 7px -3px rgba(0,0,0,0.3);--shadow-lg:0 13px 27px -5px rgba(50,50,93,0.25),0 8px 16px -8px rgba(0,0,0,0.3);--focus-ring:0 0 0 2px #3b82f6,inset 0 0 0 2px hsla(0,0%,100%,0.9);--radius:8px;--radius-lg:16px;--ease:cubic-bezier(0.215,0.61,0.355,1);--font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica 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var(--line)}.site-header-inner{display:flex;align-items:center;gap:1.5rem;height:60px}.brand{display:inline-flex;align-items:center;gap:.5rem;font-weight:700;font-size:1.05rem;letter-spacing:.02em}.brand,.brand:hover{color:var(--navy)}.brand-mark{width:22px;height:22px;flex:none}.site-nav{display:flex;align-items:center;gap:1.25rem;margin-left:auto;font-size:.95rem;font-weight:500}.site-nav a:not(.btn){color:var(--slate)}.site-nav a:not(.btn):hover{color:var(--navy)}@media (max-width:700px){.site-nav a:not(.btn){display:none}}.btn{display:inline-flex;align-items:center;gap:.35rem;padding:.55rem 1.15rem;border-radius:999px;font-weight:600;font-size:.95rem;line-height:1.3;white-space:nowrap;transition:background-color .15s var(--ease),color .15s var(--ease),box-shadow .15s var(--ease),transform .15s var(--ease)}button.btn{border:none;font-family:inherit;cursor:pointer}.btn:disabled{opacity:.6;cursor:default}.btn-primary{background:var(--accent);color:#fff;box-shadow:var(--shadow-sm)}.btn-primary:hover:not(:disabled){background:var(--accent-deep);color:#fff}.btn-secondary{color:var(--accent);background:transparent}.btn-secondary:hover:not(:disabled){color:var(--accent-deep)}.btn-block{width:100%;justify-content:center}.btn-quiet{background:none;border:none;padding:0;font-family:inherit;font-size:.9rem;font-weight:600;color:var(--accent);cursor:pointer}.btn-quiet:hover{color:var(--accent-deep)}.btn-quiet-danger{color:#9f2018}.btn-quiet-danger:hover{color:#6f1610}.arrow{display:inline-block;transition:transform .15s var(--ease)}.btn:hover .arrow,a:hover>.arrow{transform:translateX(3px)}.shell{max-width:640px;margin:0 auto;padding:3rem 1.25rem 4.5rem}.shell h1{font-size:1.9rem;letter-spacing:-.02em;margin-bottom:1.25rem}.panel{background:#fff;border:1px solid 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.75rem}.tab{border:none;background:transparent;font-family:inherit;font-size:.92rem;font-weight:600;color:var(--muted);padding:.35rem 1rem;border-radius:999px;cursor:pointer;transition:color .15s var(--ease),background-color .15s var(--ease),box-shadow .15s var(--ease)}.tab:hover{color:var(--navy)}.tab[aria-pressed=true]{background:#fff;color:var(--navy);box-shadow:var(--shadow-sm)}.card-actions{display:flex;gap:1rem;align-items:center;margin-top:1rem}.card{background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-sm);margin-top:.9rem}.callout,.callout-error,.card{border-radius:var(--radius);padding:1rem 1.25rem}.callout,.callout-error{font-weight:600;font-size:.95rem;margin:1.25rem 0 0}.callout{background:#fff8e6;border:1px solid #f2d879;color:#7a5c00}.callout-error{background:#fdf0ef;border:1px solid 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nav{display:flex;flex-wrap:wrap;gap:.4rem 1.1rem;justify-content:center}.site-footer nav a{text-decoration:underline;text-underline-offset:2px}.site-footer a{color:var(--muted)}.site-footer a:hover{color:var(--navy)}.btn:focus-visible,.tab:focus-visible{outline:2px solid transparent;box-shadow:var(--focus-ring)}@media (prefers-reduced-motion:reduce){.arrow,.btn,.input,.tab{transition:none}}