:root {
  color-scheme: light dark;
  --page: #f4f4f5;
  --surface: #ffffff;
  --ink: #18181b;
  --muted: #65656d;
  --line: #dedee2;
  --accent: #222222;
  --soft: #eeeeef;
  --ui: "Microsoft YaHei UI", "PingFang SC", system-ui, sans-serif;
}
:root[data-theme="dark"] {
  --page: #202020;
  --surface: #292929;
  --ink: #f4f4f5;
  --muted: #b5b5ba;
  --line: #464646;
  --accent: #ffffff;
  --soft: #343434;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--page); color: var(--ink); font-family: var(--ui); line-height: 1.75; }
a { color: inherit; }
.content_header { position: sticky; z-index: 10; top: 0; border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: blur(14px); }
.content_nav { display: flex; align-items: center; justify-content: space-between; width: min(1080px, calc(100% - 32px)); height: 64px; margin: auto; }
.content_brand { font-size: 19px; font-weight: 900; letter-spacing: -.04em; text-decoration: none; }
.content_brand span { color: var(--muted); }
.content_links { display: flex; gap: 22px; font-size: 14px; }
.content_links a { text-decoration: none; }
.content_links a[aria-current="page"] { font-weight: 800; }
.content_language {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 32px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-weight: 800;
  line-height: 1;
  transform: translateY(-1px);
}
.content_main { width: min(1080px, calc(100% - 32px)); margin: 0 auto; padding: 72px 0 80px; }
.page_intro { max-width: 760px; margin-bottom: 48px; }
.eyebrow { margin: 0 0 8px; color: var(--muted); font-size: 13px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
h1 { margin: 0 0 18px; font-size: clamp(38px, 7vw, 72px); line-height: 1.04; letter-spacing: -.06em; }
.lead { margin: 0; color: var(--muted); font-size: clamp(17px, 2vw, 21px); }
.section { margin-top: 52px; }
.section h2 { margin: 0 0 20px; font-size: 26px; letter-spacing: -.035em; }
.card_grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.card { padding: 24px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); }
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.check_list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 0; padding: 0; list-style: none; }
.check_list li { padding: 16px 18px 16px 46px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); position: relative; }
.check_list li::before { content: "✓"; position: absolute; left: 18px; font-weight: 900; }
.privacy_note { padding: 24px; border-left: 4px solid var(--accent); background: var(--soft); }
.tutorial_grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.tutorial_card { display: block; padding: 26px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); text-decoration: none; }
.tutorial_card:hover { border-color: var(--accent); transform: translateY(-2px); }
.tutorial_card small { color: var(--muted); font-weight: 700; }
.tutorial_card h2 { margin: 6px 0 8px; font-size: 20px; line-height: 1.35; }
.tutorial_card p { margin: 0; color: var(--muted); font-size: 14px; }
.tutorial_detail { scroll-margin-top: 84px; margin-top: 28px; padding: 28px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); }
.tutorial_detail h2 { margin-top: 0; }
.tutorial_detail ol { margin-bottom: 0; padding-left: 22px; }
.content_footer { padding: 24px 16px; border-top: 1px solid var(--line); color: var(--muted); text-align: center; font-size: 13px; }
.content_footer a { margin: 0 7px; color: var(--ink); text-decoration: none; }
.legal_copy { max-width: 780px; }
.legal_copy section { margin-top: 38px; }
.legal_copy h2 { margin: 0 0 10px; font-size: 22px; letter-spacing: -.025em; }
.legal_copy p, .legal_copy li { color: var(--muted); }
.legal_copy ul { padding-left: 22px; }
.legal_updated { display: inline-block; margin-top: 10px; padding: 4px 10px; border-radius: 999px; background: var(--soft); color: var(--muted); font-size: 12px; font-weight: 700; }
@media (max-width: 720px) {
  .content_nav { height: 56px; }
  .content_links { gap: 13px; font-size: 12px; }
  .content_main { padding-top: 48px; }
  .card_grid, .check_list, .tutorial_grid { grid-template-columns: 1fr; }
  .card, .tutorial_card, .tutorial_detail { padding: 20px; }
  .content_brand { font-size: 16px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .tutorial_card { transition: none; } }