:root {
  --bg: #ffffff;
  --fg: #1d1d1f;
  --muted: #5f6368;
  --card: #f5f7fa;
  --border: #e3e6ea;
  --accent: #2f6fed;
  --accent-soft: #e8f0fe;
  --code-bg: #0f172a;
  --code-fg: #e2e8f0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --fg: #ececf1;
    --muted: #a3a8b3;
    --card: #1a1d23;
    --border: #2a2f37;
    --accent: #6c9cff;
    --accent-soft: #1d2a44;
    --code-bg: #0b0f19;
    --code-fg: #d9e2f0;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB",
    "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 24px; }
header.top {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding: 18px 0; border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--fg); white-space: nowrap; }
.brand img { width: 32px; height: 32px; }
nav.links { display: flex; gap: 18px; font-size: 15px; flex-wrap: wrap; }
.hero { display: flex; gap: 32px; align-items: center; padding: 56px 0 32px; }
.hero img { width: 148px; height: 148px; flex: none; }
.hero h1 { font-size: 40px; line-height: 1.15; margin: 0 0 12px; letter-spacing: -0.02em; }
.hero p.lead { font-size: 19px; color: var(--muted); margin: 0 0 22px; }
.buttons { display: flex; gap: 12px; flex-wrap: wrap; }
.button {
  display: inline-block; padding: 10px 18px; border-radius: 10px; font-weight: 600;
  border: 1px solid var(--accent); color: var(--accent); background: transparent;
}
.button.primary { background: var(--accent); color: #fff; }
.button:hover { text-decoration: none; filter: brightness(1.05); }
section { padding: 28px 0; border-top: 1px solid var(--border); }
section h2 { font-size: 26px; margin: 0 0 16px; letter-spacing: -0.01em; }
section h3 { font-size: 18px; margin: 22px 0 8px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 18px 20px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
pre {
  background: var(--code-bg); color: var(--code-fg); padding: 14px 16px; border-radius: 10px;
  overflow-x: auto; font: 14px/1.55 ui-monospace, SFMono-Regular, Menlo, monospace;
}
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.92em; }
p code, li code { background: var(--accent-soft); padding: 1px 6px; border-radius: 6px; }
.note {
  background: var(--accent-soft); border-radius: 12px; padding: 12px 16px; margin: 16px 0;
  font-size: 15px;
}
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-weight: 600; }
.flow { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; font-weight: 600; }
.flow span.box { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 8px 12px; }
.flow span.arrow { color: var(--muted); }
footer { padding: 32px 0 48px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--border); }
.policy h2 { font-size: 22px; margin-top: 28px; }
.policy { padding: 36px 0 12px; }
.policy h1 { font-size: 34px; margin: 0 0 6px; }
.updated { color: var(--muted); margin: 0 0 18px; }
@media (max-width: 640px) {
  .hero { flex-direction: column; align-items: flex-start; padding-top: 36px; }
  .hero img { width: 112px; height: 112px; }
  .hero h1 { font-size: 32px; }
  nav.links { gap: 12px; font-size: 14px; }
}