:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f7f7fb;
  --color-text: #1a1a2e;
  --color-text-muted: #5b5b6b;
  --color-border: #e5e5ee;
  --color-accent: #4f46e5;
  --color-accent-dark: #3d35c4;
  --color-accent-bg: #eef0ff;
  --max-width: 1080px;
  --radius: 10px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header / Nav ---------- */

header.site-header {
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
  z-index: 10;
}

.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
  gap: 16px;
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text);
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }

nav.primary-nav {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

nav.primary-nav a {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}
nav.primary-nav a:hover,
nav.primary-nav a.active {
  color: var(--color-text);
  text-decoration: none;
}

.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover { background: var(--color-accent-dark); }

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* ---------- Hero ---------- */

.hero {
  padding: 72px 24px 56px;
  text-align: center;
  background: linear-gradient(180deg, var(--color-accent-bg) 0%, rgba(255,255,255,0) 100%);
}

.hero h1 {
  font-size: 2.6rem;
  line-height: 1.15;
  margin: 0 0 20px;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.hero p.lead {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  max-width: 620px;
  margin: 0 auto 32px;
}

.hero .cta-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.beta-badge {
  display: inline-block;
  background: var(--color-accent-bg);
  color: var(--color-accent-dark);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
}

/* ---------- Sections / Content ---------- */

main {
  padding: 56px 24px;
}

section + section { margin-top: 56px; }

h1, h2, h3 { color: var(--color-text); }
h2 { font-size: 1.7rem; margin-bottom: 12px; }
h3 { font-size: 1.2rem; }

.section-lead {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  max-width: 680px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
  margin-top: 28px;
}

.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  background: var(--color-bg);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 8px;
}

.card p {
  color: var(--color-text-muted);
  margin-bottom: 0;
  font-size: 0.95rem;
}

.doc-page main {
  max-width: 780px;
  margin: 0 auto;
}

.doc-page h1 { font-size: 2rem; margin-bottom: 8px; }
.doc-page .subtitle { color: var(--color-text-muted); margin-bottom: 40px; }
.doc-page h2 { margin-top: 40px; border-top: 1px solid var(--color-border); padding-top: 32px; }
.doc-page h2:first-of-type { border-top: none; padding-top: 0; }

.callout {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 20px 0;
  font-size: 0.95rem;
}
.callout.warn {
  background: #fff8e6;
  border-color: #f2e0a8;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.92rem;
}
th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
}
th { color: var(--color-text-muted); font-weight: 600; }

code, pre {
  font-family: "SF Mono", Consolas, Monaco, monospace;
  font-size: 0.88rem;
}
code {
  background: var(--color-bg-alt);
  padding: 2px 6px;
  border-radius: 4px;
}
pre {
  background: #1a1a2e;
  color: #e5e5f0;
  padding: 16px 18px;
  border-radius: var(--radius);
  overflow-x: auto;
}
pre code { background: none; padding: 0; color: inherit; }

ol, ul { padding-left: 22px; }
li { margin-bottom: 6px; }

/* ---------- Footer ---------- */

footer.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 24px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-row {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #14141f;
    --color-bg-alt: #1b1b29;
    --color-text: #f0f0f5;
    --color-text-muted: #a3a3b8;
    --color-border: #2a2a3d;
    --color-accent: #7c74f0;
    --color-accent-dark: #948dfd;
    --color-accent-bg: #201f3a;
  }
  header.site-header { background: rgba(20, 20, 31, 0.92); }
  pre { background: #0c0c14; }
  .callout.warn { background: #2b2410; border-color: #4a3d16; color: #f0e0b0; }
}

@media (max-width: 640px) {
  .nav-row { flex-direction: column; align-items: flex-start; gap: 12px; }
  nav.primary-nav { gap: 14px; }
  .hero h1 { font-size: 2rem; }
}