*, *::before, *::after { box-sizing: border-box; }
:root {
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-dark: #0f172a;
  --text: #0f172a;
  --text-muted: #475569;
  --text-on-dark: #e2e8f0;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent: #10b981;
  --border: #e2e8f0;
  --code-bg: #f1f5f9;
}
html { scroll-behavior: smooth; }
body {
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  margin: 0; padding: 0;
  color: var(--text); background: var(--bg);
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 12px; color: var(--text); }
h1 { font-size: 44px; }
h2 { font-size: 28px; margin-top: 0; }
h3 { font-size: 18px; }
p { margin: 0 0 16px; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.92em; background: var(--code-bg); padding: 2px 6px; border-radius: 4px; }
pre {
  background: var(--code-bg);
  border-radius: 8px;
  padding: 16px 20px;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  line-height: 1.55;
  color: #1e293b;
}
pre code { background: none; padding: 0; }

.container { max-width: 1000px; margin: 0 auto; padding: 0 24px; }

header.site {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  position: sticky; top: 0; background: rgba(255,255,255,0.92);
  backdrop-filter: blur(6px);
  z-index: 10;
}
header.site .container {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
}
header.site .logo {
  font-weight: 700; font-size: 18px; color: var(--text); text-decoration: none;
}
header.site nav { display: flex; gap: 24px; font-size: 14px; }
header.site nav a { color: var(--text-muted); }
header.site nav a:hover { color: var(--text); text-decoration: none; }

.hero { padding: 80px 0 60px; }
.hero h1 { margin-bottom: 20px; }
.hero .lead { font-size: 19px; color: var(--text-muted); max-width: 640px; }
.hero .cta { margin-top: 32px; display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; background: var(--primary); color: white;
  padding: 12px 22px; border-radius: 8px; font-weight: 500; font-size: 15px;
}
.btn:hover { background: var(--primary-dark); text-decoration: none; }
.btn.secondary { background: white; color: var(--primary); border: 1px solid var(--primary); }
.btn.secondary:hover { background: var(--bg-alt); }

section { padding: 56px 0; border-top: 1px solid var(--border); }
section.alt { background: var(--bg-alt); }
section.dark { background: var(--bg-dark); color: var(--text-on-dark); border-top: none; }
section.dark h2, section.dark h3 { color: white; }
section.dark a { color: #93c5fd; }
section.dark code { background: rgba(255,255,255,0.1); color: #e2e8f0; }
section.dark pre { background: #1e293b; color: #e2e8f0; }
section.dark pre code { color: #e2e8f0; }

.cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 28px; margin-top: 32px; }
.card {
  background: white; border: 1px solid var(--border); border-radius: 10px;
  padding: 24px;
}
section.dark .card { background: rgba(255,255,255,0.04); border-color: rgba(255,255,255,0.08); }
.card h3 { margin-top: 0; color: var(--text); }
section.dark .card h3 { color: white; }
.card .icon {
  display: inline-flex; width: 38px; height: 38px; align-items: center; justify-content: center;
  background: rgba(37,99,235,0.1); color: var(--primary); border-radius: 8px;
  margin-bottom: 12px; font-weight: 700; font-size: 18px;
}

.flow { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-top: 32px; counter-reset: step; }
.flow .step { padding: 20px; background: white; border: 1px solid var(--border); border-radius: 10px; counter-increment: step; position: relative; }
.flow .step::before {
  content: counter(step); position: absolute; top: -14px; left: 20px;
  background: var(--primary); color: white; width: 28px; height: 28px;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 14px;
}
.flow .step h3 { font-size: 15px; margin-top: 8px; }
.flow .step p { font-size: 14px; color: var(--text-muted); margin: 0; }

ul.checks { list-style: none; padding: 0; margin: 0; }
ul.checks li { padding-left: 32px; position: relative; margin-bottom: 10px; }
ul.checks li::before {
  content: "✓"; color: var(--accent); position: absolute; left: 0; top: 0;
  font-weight: 700;
}

footer.site {
  border-top: 1px solid var(--border); padding: 32px 0; margin-top: 40px;
  font-size: 14px; color: var(--text-muted);
}
footer.site .container { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
footer.site nav { display: flex; gap: 20px; }

@media (max-width: 640px) {
  h1 { font-size: 32px; }
  h2 { font-size: 22px; }
  .hero { padding: 48px 0 32px; }
  section { padding: 40px 0; }
  header.site nav { gap: 14px; }
}