:root {
  --bg: #ffffff; --fg: #1d1d1f; --muted: #6e6e73; --line: #e5e5ea; --card: #f5f5f7;
  --brand: #4b4fd8; --brand-soft: #eef0ff;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111114; --fg: #f5f5f7; --muted: #a1a1a6; --line: #2c2c31; --card: #1c1c21; --brand: #8f96ff; --brand-soft: #1c1d3a; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 24px; }

header.site { border-bottom: 1px solid var(--line); }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--fg); }
.brand:hover { text-decoration: none; }
.brand img { width: 32px; height: 32px; }
nav a { margin-left: 22px; color: var(--muted); font-size: 15px; }
nav a.active, nav a:hover { color: var(--fg); text-decoration: none; }

main { padding: 40px 0 72px; }
h1 { font-size: 32px; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 21px; margin: 40px 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
.meta { color: var(--muted); font-size: 14px; }
.promise { background: var(--brand-soft); border-left: 4px solid var(--brand); border-radius: 8px; padding: 14px 18px; margin: 20px 0; }

table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14.5px; }
th, td { border: 1px solid var(--line); padding: 9px 12px; text-align: left; vertical-align: top; }
th { background: var(--card); }
th:first-child, td:first-child { min-width: 5em; }
code, kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .92em;
  background: var(--card); border: 1px solid var(--line); border-radius: 5px; padding: 1px 6px;
}
details { border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; margin: 10px 0; background: var(--card); }
summary { cursor: pointer; font-weight: 600; }
details p, details ul { margin: 10px 0 0; }

footer.site { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer.site .wrap { padding-top: 24px; padding-bottom: 40px; display: flex; flex-wrap: wrap; gap: 8px 22px; justify-content: space-between; }

/* 首页 */
.hero { text-align: center; padding: 28px 0 8px; }
.hero img.icon { width: 112px; height: 112px; }
.hero h1 { font-size: 44px; margin-top: 12px; }
.hero p.lead { font-size: 20px; color: var(--muted); margin: 6px 0 22px; }
.btn { display: inline-block; padding: 12px 26px; border-radius: 999px; background: var(--brand); color: #fff; font-weight: 600; }
.btn:hover { text-decoration: none; opacity: .9; }
.btn.disabled { background: var(--card); color: var(--muted); border: 1px solid var(--line); cursor: default; }
.shot { width: 100%; border-radius: 14px; border: 1px solid var(--line); box-shadow: 0 20px 60px rgba(40, 40, 120, .18); margin-top: 28px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 16px; margin: 20px 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14.5px; line-height: 1.65; }
.gallery { display: grid; grid-template-columns: repeat(auto-fit, minmax(380px, 1fr)); gap: 16px; }
.gallery img { width: 100%; border-radius: 12px; border: 1px solid var(--line); }
@media (max-width: 560px) {
  .hero h1 { font-size: 34px; }
  .gallery { grid-template-columns: 1fr; }
  nav a { margin-left: 14px; }
}