:root{--bg:#fff;--fg:#1d1d1f;--muted:#5f6368;--brand:#0f9d58;--card:#f5f7f6;--line:#e3e6e4}
*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--fg);line-height:1.6}
a{color:var(--brand)}header{border-bottom:1px solid var(--line)}
.wrap{max-width:860px;margin:0 auto;padding:0 20px}
.nav{display:flex;justify-content:space-between;align-items:center;padding:16px 0;flex-wrap:wrap;gap:8px}
.logo{font-weight:800;font-size:1.25rem;letter-spacing:.5px;color:var(--fg);text-decoration:none}
.nav nav a{margin-left:16px;color:var(--muted);text-decoration:none;font-size:.95rem}.nav nav a:hover{color:var(--fg)}
.hero{padding:64px 0 40px;text-align:center}.hero h1{font-size:2.2rem;margin:0 0 12px}.hero p{color:var(--muted);font-size:1.1rem;margin:0 auto 28px;max-width:560px}
.btn{display:inline-block;background:#25d366;color:#fff;text-decoration:none;padding:14px 26px;border-radius:999px;font-weight:700}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;padding:20px 0 56px}
.card{background:var(--card);border-radius:14px;padding:22px}.card h3{margin:0 0 6px;font-size:1.05rem}.card p{margin:0;color:var(--muted);font-size:.95rem}
main.doc{padding:40px 0 56px}main.doc h1{font-size:1.8rem}main.doc h2{font-size:1.15rem;margin-top:28px}
footer{border-top:1px solid var(--line);padding:24px 0;color:var(--muted);font-size:.85rem}footer a{color:var(--muted);margin-right:14px}