:root {
  --bg: #ffffff;
  --fg: #1a1a2e;
  --muted: #5b5b6e;
  --brand: #5b3df5;
  --brand-dark: #472fd1;
  --card: #f4f3ff;
  --border: #e2e0f5;
  --radius: 12px;
  --max: 960px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1rem; }

.topbar {
  position: sticky; top: 0; z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 56px;
}
.brand { font-weight: 800; font-size: 1.25rem; color: var(--brand); text-decoration: none; }
.nav { display: flex; gap: 1rem; }
.nav a { color: var(--fg); text-decoration: none; }
.nav a:hover, .nav a:focus-visible { color: var(--brand); text-decoration: underline; }
.menu-btn { display: none; background: none; border: 1px solid var(--border); border-radius: 8px; padding: .3rem .6rem; font-size: 1.1rem; }

.hero { padding: 3rem 1rem 2rem; }
.hero h1 { font-size: clamp(1.8rem, 5vw, 2.8rem); line-height: 1.15; margin: 0 0 1rem; }
.lead { font-size: 1.1rem; color: var(--muted); max-width: 60ch; }
.badges { color: var(--muted); font-size: .9rem; }

.section { padding: 2rem 1rem; }
.section h2 { margin-top: 0; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.1rem; }
.card h3 { margin: 0 0 .4rem; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); }

.models { padding-left: 1.2rem; }
.models li { margin-bottom: .4rem; }
.muted { color: var(--muted); }

.highlight { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); }
.highlight ul { padding-left: 1.2rem; }

.cta-row { display: flex; flex-wrap: wrap; gap: .75rem; margin: 1.2rem 0; }
.btn {
  display: inline-block; padding: .65rem 1.2rem;
  border-radius: 999px; border: 1px solid var(--brand);
  color: var(--brand); text-decoration: none; font-weight: 600;
}
.btn.primary { background: var(--brand); color: #fff; }
.btn.primary:hover, .btn.primary:focus-visible { background: var(--brand-dark); }
.btn:hover, .btn:focus-visible { text-decoration: underline; }

.footer { border-top: 1px solid var(--border); margin-top: 2rem; }
.footer-inner {
  display: flex; flex-wrap: wrap; gap: .5rem 1.5rem;
  align-items: center; justify-content: space-between;
  padding-top: 1rem; padding-bottom: 1rem;
  color: var(--muted); font-size: .9rem;
}
.footer nav { display: flex; gap: 1rem; }
.footer a { color: var(--brand); }

.prose { max-width: 70ch; }
.prose h1 { font-size: 1.9rem; }
.prose h2 { margin-top: 2rem; font-size: 1.25rem; }
.prose table { border-collapse: collapse; width: 100%; margin: 1rem 0; font-size: .95rem; }
.prose th, .prose td { border: 1px solid var(--border); padding: .5rem .6rem; text-align: left; vertical-align: top; }
.prose th { background: var(--card); }

.form { display: grid; gap: .9rem; max-width: 560px; }
.field { display: grid; gap: .3rem; }
.field label { font-weight: 600; }
.field input, .field select, .field textarea {
  font: inherit; padding: .6rem .7rem;
  border: 1px solid var(--border); border-radius: 8px; background: #fff; color: var(--fg);
}
.field input:focus-visible, .field select:focus-visible, .field textarea:focus-visible,
a:focus-visible, button:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.error { color: #b00020; font-size: .9rem; min-height: 1.2em; }
.steps { padding-left: 1.2rem; }
.steps li { margin-bottom: .5rem; }

@media (max-width: 640px) {
  .menu-btn { display: block; }
  .nav {
    display: none; position: absolute; top: 56px; left: 0; right: 0;
    flex-direction: column; background: var(--bg);
    border-bottom: 1px solid var(--border); padding: .75rem 1rem 1rem;
  }
  .nav.open { display: flex; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12121a; --fg: #f0efff; --muted: #b9b7d6;
    --card: #1d1d2b; --border: #33334d;
  }
  .field input, .field select, .field textarea { background: #1d1d2b; }
}

@media print {
  .topbar, .footer, .cta-row, .menu-btn { display: none; }
  body { color: #000; }
}