:root { --brand: #4338ca; --brand-dark: #3730a3; --ink: #0f172a; --muted: #475569; --line: #e2e8f0; --soft: #eef2ff; }
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--muted); background: #fff; line-height: 1.6; }
a { color: var(--brand); }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 12px; padding-bottom: 12px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--ink); text-decoration: none; }
.btn { display: inline-block; border-radius: 10px; padding: 10px 18px; font-weight: 600; text-decoration: none; }
.btn-primary { background: var(--brand); color: #fff; } .btn-primary:hover { background: var(--brand-dark); }
.btn-secondary { border: 1px solid #cbd5e1; color: var(--ink); background: #fff; }
.hero { background: linear-gradient(180deg, var(--soft), #fff); padding: 64px 0; }
.hero .wrap { display: grid; gap: 40px; align-items: center; }
@media (min-width: 900px) { .hero .wrap { grid-template-columns: 1.1fr 1fr; } }
h1 { color: var(--ink); font-size: clamp(2rem, 5vw, 3rem); line-height: 1.1; margin: 8px 0 16px; }
h2 { color: var(--ink); font-size: 1.75rem; margin: 0 0 12px; }
h3 { color: var(--ink); margin: 0 0 6px; }
.eyebrow { color: var(--brand); font-weight: 700; font-size: .75rem; letter-spacing: .12em; text-transform: uppercase; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.card { border: 1px solid var(--line); border-radius: 14px; background: #fff; padding: 20px; box-shadow: 0 1px 2px rgba(15,23,42,.05); }
.demo pre { margin: 0; white-space: pre-wrap; font-size: .85rem; }
.mark { background: #fcd34d; color: #78350f; border-radius: 4px; padding: 0 4px; }
section { padding: 56px 0; } .alt { background: #f8fafc; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.grid3 { display: grid; gap: 16px; } @media (min-width: 800px) { .grid3 { grid-template-columns: repeat(3, 1fr); } }
details { border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; margin-bottom: 10px; background: #fff; }
summary { cursor: pointer; font-weight: 600; color: var(--ink); }
footer { border-top: 1px solid var(--line); padding: 24px 0; font-size: .9rem; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; }
.note { font-size: .85rem; }
.btn:focus-visible, summary:focus-visible, a:focus-visible { outline: 3px solid var(--brand); outline-offset: 3px; }