:root{--bg:#fff;--text:#111;--muted:#6b7280;--accent:#111}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,system-ui,Segoe UI,Roboto,Helvetica,Arial,Apple Color Emoji,Segoe UI Emoji}.container{max-width:980px;margin:0 auto;padding:24px}.btn{display:inline-block;padding:10px 16px;border-radius:12px;background:var(--accent);color:#fff;text-decoration:none;font-size:14px}.btn.outline{background:transparent;color:var(--text)}.btn.outline,.card{border:1px solid #e5e7eb}.card{border-radius:16px;padding:16px;background:#fff;box-shadow:0 1px 2px rgba(0,0,0,.04)}.grid{display:grid;grid-gap:16px;gap:16px}.grid-2{grid-template-columns:1fr}@media (min-width:768px){.grid-2{grid-template-columns:1fr 1fr}}h1{font-size:40px;line-height:1.1;margin:0}h2{font-size:24px;margin:0 0 8px}p{margin:8px 0;color:var(--muted)}header{position:-webkit-sticky;position:sticky;top:0;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:hsla(0,0%,100%,.86);border-bottom:1px solid #eee;z-index:40}nav a{margin-left:16px;font-size:14px;color:var(--text);text-decoration:none}footer{border-top:1px solid #eee;margin-top:32px}