:root {
  --brand: #1a73e8;
  --brand-dark: #1557b0;
  --ink: #1f2328;
  --muted: #57606a;
  --line: #d0d7de;
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "Hiragino Sans", "Yu Gothic", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
header.hero {
  background: linear-gradient(180deg, var(--brand) 0%, var(--brand-dark) 100%);
  color: #fff;
  padding: 64px 24px 56px;
  text-align: center;
}
.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  letter-spacing: -0.02em;
}
.hero p.tagline {
  margin: 0 auto 28px;
  max-width: 720px;
  font-size: clamp(1rem, 2vw, 1.2rem);
  opacity: 0.95;
}
.hero .actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.15s;
}
.btn:hover { opacity: 0.85; }
.btn-primary { background: #fff; color: var(--brand-dark); }
.btn-outline { background: transparent; color: #fff; border: 2px solid #fff; }
main {
  max-width: 880px;
  margin: 0 auto;
  padding: 56px 24px;
}
section + section { margin-top: 48px; }
h2 {
  font-size: 1.6rem;
  margin: 0 0 16px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 8px;
}
h3 { font-size: 1.15rem; margin: 24px 0 8px; }
ul { padding-left: 1.4em; }
li + li { margin-top: 4px; }
code, pre {
  font-family: ui-monospace, SFMono-Regular, "Menlo", monospace;
  font-size: 0.92em;
}
pre {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 16px;
  overflow-x: auto;
  line-height: 1.5;
}
code { background: var(--bg-soft); padding: 1px 6px; border-radius: 4px; }
pre code { background: transparent; padding: 0; }
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 16px;
}
.card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px;
  background: #fff;
}
.card h3 { margin-top: 0; color: var(--brand-dark); }
.card p { margin: 8px 0 0; color: var(--muted); font-size: 0.95rem; }
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  background: #e8f0fe;
  color: var(--brand-dark);
  margin-left: 6px;
  vertical-align: middle;
}
.badge.muted { background: #f1f3f4; color: var(--muted); }
a { color: var(--brand-dark); }
footer {
  border-top: 1px solid var(--line);
  padding: 24px;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}
footer a { color: var(--muted); }

/* document page (privacy / license) */
.doc-header {
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
  padding: 24px;
  text-align: center;
}
.doc-header .crumbs {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 8px;
}
.doc-header .crumbs a { color: var(--muted); text-decoration: none; }
.doc-header .crumbs a:hover { text-decoration: underline; }
.doc-header h1 {
  margin: 0;
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  color: var(--ink);
}
.doc-header .meta {
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--muted);
}
main.doc {
  max-width: 820px;
}
main.doc h2 { margin-top: 40px; }
main.doc h3 { margin-top: 28px; }
main.doc p { margin: 12px 0; }
main.doc hr {
  margin: 40px 0;
  border: none;
  border-top: 1px solid var(--line);
}
table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.94rem;
}
th, td {
  border: 1px solid var(--line);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}
th { background: var(--bg-soft); font-weight: 600; }
.callout {
  background: #fff7e6;
  border-left: 4px solid #f4b400;
  padding: 12px 16px;
  margin: 16px 0;
  border-radius: 4px;
}
.callout.note {
  background: #e8f0fe;
  border-left-color: var(--brand);
}