:root {
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --text: #17181c;
  --text-dim: #5b6070;
  --border: #e3e5ea;
  --accent: #1a56db;
  --radius: 10px;
  --maxw: 880px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

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

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 62px;
  flex-wrap: wrap;
}

.brand {
  font-weight: 650;
  font-size: 1.02rem;
  color: var(--text);
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }

.site-nav {
  display: flex;
  gap: 22px;
  font-size: 0.93rem;
}
.site-nav a { color: var(--text-dim); }
.site-nav a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero {
  padding: 78px 0 62px;
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  margin: 0 0 14px;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2.1rem, 6vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 700;
}

.lede {
  margin: 0 0 26px;
  font-size: 1.14rem;
  color: var(--text-dim);
  max-width: 62ch;
}

.notice {
  margin: 0;
  padding: 16px 20px;
  background: var(--bg-alt);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.95rem;
  color: var(--text-dim);
  max-width: 68ch;
}
.notice strong { color: var(--text); }

/* Sections */
.section { padding: 56px 0; }
.section.alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.section h2 {
  margin: 0 0 26px;
  font-size: 1.42rem;
  letter-spacing: -0.02em;
  font-weight: 650;
}

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.feature-list li {
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
}

.feature-list h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 650;
}

.feature-list p {
  margin: 0;
  font-size: 0.94rem;
  color: var(--text-dim);
}

.fact-grid {
  margin: 0;
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.fact-grid dt {
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.fact-grid dd {
  margin: 0;
  font-size: 0.96rem;
}

/* Doc pages */
.doc {
  padding-top: 54px;
  padding-bottom: 70px;
  max-width: 760px;
}

.doc h1 {
  margin: 0 0 8px;
  font-size: clamp(1.75rem, 5vw, 2.35rem);
  letter-spacing: -0.03em;
  font-weight: 700;
}

.doc .meta {
  margin: 0 0 40px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--text-dim);
}

.doc h2 {
  margin: 40px 0 12px;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
  font-weight: 650;
}

.doc p, .doc li { color: #2c2f38; }
.doc p { margin: 0 0 15px; }

.doc ul {
  margin: 0 0 15px;
  padding-left: 22px;
}
.doc li { margin-bottom: 8px; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 30px 0;
  font-size: 0.88rem;
  color: var(--text-dim);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}

.footer-inner p { margin: 0; }

.footer-nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
.footer-nav a { color: var(--text-dim); }
.footer-nav a:hover { color: var(--text); }

@media (max-width: 560px) {
  .hero { padding: 54px 0 46px; }
  .section { padding: 44px 0; }
  .site-nav { gap: 16px; font-size: 0.88rem; }
  .header-inner { min-height: 58px; }
}