:root{--qc-bg:#f8fafc;--qc-surface:#ffffff;--qc-text:#0f172a;--qc-text-muted:#64748b;--qc-accent:#38bdf8;--qc-accent-dark:#0ea5e9;--qc-border:#e2e8f0;--qc-success:#22c55e;--qc-warning:#f59e0b;--qc-radius:12px;--qc-radius-lg:16px;--qc-shadow:0 1px 3px rgb(15 23 42/0.08);--qc-shadow-lg:0 10px 40px rgb(15 23 42/0.1);--font-sans:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--font-mono:ui-monospace,"Cascadia Code","Source Code Pro",Menlo,Consolas,monospace}*,:after,:before{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--qc-bg);color:var(--qc-text);font-family:var(--font-sans);line-height:1.6;-webkit-font-smoothing:antialiased}.mono{font-family:var(--font-mono)}.qc-container{width:100%;max-width:1120px;margin:0 auto;padding:0 1.25rem}.qc-section{padding:4rem 0}.qc-section--tight{padding:2.5rem 0}.qc-h1{font-size:clamp(2rem,4vw,2.75rem);line-height:1.15;margin:0 0 1rem}.qc-h1,.qc-h2{font-weight:700;letter-spacing:-.02em}.qc-h2{font-size:clamp(1.5rem,2.5vw,1.875rem);margin:0 0 .75rem}.qc-h3{font-weight:600;margin:0 0 .5rem}.qc-h3,.qc-lead{font-size:1.125rem}.qc-lead{color:var(--qc-text-muted);max-width:42rem;margin:0}.qc-btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.65rem 1.25rem;font-size:.9375rem;font-weight:600;border-radius:var(--qc-radius);border:none;cursor:pointer;text-decoration:none;transition:background .15s,transform .1s,box-shadow .15s}.qc-btn:disabled{opacity:.55;cursor:not-allowed}.qc-btn--primary{background:linear-gradient(135deg,var(--qc-accent) 0,var(--qc-accent-dark) 100%);color:#0f172a;box-shadow:var(--qc-shadow)}.qc-btn--primary:hover:not(:disabled){box-shadow:var(--qc-shadow-lg);transform:translateY(-1px)}.qc-btn--secondary{background:var(--qc-surface);color:var(--qc-text);border:1px solid var(--qc-border)}.qc-btn--secondary:hover:not(:disabled){border-color:var(--qc-accent);color:var(--qc-accent-dark)}.qc-card{background:var(--qc-surface);border-radius:var(--qc-radius-lg);border:1px solid var(--qc-border);box-shadow:var(--qc-shadow);padding:1.5rem}.qc-grid-2{display:grid;grid-gap:1.25rem;gap:1.25rem;grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}.qc-grid-3{display:grid;grid-gap:1.5rem;gap:1.5rem;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}