:root {
  --bg: #f6f8fa;
  --ink: #1f2328;
  --mute: #59636e;
  --line: #d0d7de;
  --white: #fff;
  --code: #0d1117;
  --accent: #0969da;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.65;
}
img { max-width:100%;height:auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(1100px, calc(100% - 40px)); margin-inline: auto; }
nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 58px;
}
.brand { color: var(--ink); font-weight: 700; }
.brand:hover { text-decoration: none; }
.links { display: flex; gap: 18px; font-size: 0.9rem; }
.links a { color: var(--mute); }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--ink);
  color: var(--white);
  font-weight: 650;
  padding: 8px 14px;
  border-radius: 6px;
}
.button:hover { text-decoration: none; opacity: 0.92; }
.ghost {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
}
.hero { padding: 40px 0 24px; background: var(--bg); border-bottom: 1px solid var(--line); }
.docs {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 36px;
  align-items: start;
}
.toc a {
  display: block;
  padding: 6px 0;
  color: var(--mute);
  font-size: 0.88rem;
  border-left: 2px solid transparent;
  padding-left: 10px;
}
.toc a:hover { color: var(--ink); }
.kicker { font-size: 0.78rem; color: var(--mute); letter-spacing: 0.04em; margin-bottom: 8px; }
.hero h1, .page-head h1 {
  font-size: clamp(1.7rem, 3.6vw, 2.4rem);
  line-height: 1.25;
  color: var(--ink);
}
.lead { color: var(--mute); margin: 10px 0 16px; }
pre {
  background: var(--code);
  color: #d4e0ff;
  padding: 14px 16px;
  border-radius: 8px;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.95rem;
  margin: 14px 0;
  overflow: auto;
}
.block ol { margin: 12px 0 18px 18px; }
.section { padding: 72px 0; }
.head { margin-bottom: 28px; max-width: 40em; }
.grid6, .cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.card, .download-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}
.icon { font-size: 0.75rem; color: var(--mute); margin-bottom: 6px; }
.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 28px;
  align-items: center;
}
.split img, .shot img, .cta img {
  width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.scene-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 16px 0 18px;
}
.scene {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  display: flex;
  gap: 8px;
  color: var(--ink);
}
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.review { border-top: 1px solid var(--line); padding: 14px 0; }
.person { margin-top: 10px; color: var(--mute); display: flex; flex-direction: column; }
.visual { padding: 0 0 72px; }
.faq-layout {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 28px;
}
details { border-bottom: 1px solid var(--line); padding: 12px 0; }
summary { cursor: pointer; font-weight: 650; }
details p { margin-top: 8px; color: var(--mute); }
.cta { background: var(--bg); padding: 36px 0; border-top: 1px solid var(--line); }
.cta-in {
  display: grid;
  grid-template-columns: 0.7fr 1.1fr auto;
  gap: 20px;
  align-items: center;
}
.cta img { height: 110px; object-fit: cover; }
footer {
  background: var(--white);
  border-top: 1px solid var(--line);
  color: var(--mute);
  padding: 36px 0 18px;
}
.footer {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}
.footer .brand { color: var(--ink); }
.footer h4 { color: var(--ink); margin-bottom: 8px; }
.footer a { display: block; margin: 6px 0; color: var(--mute); }
.copy { border-top: 1px solid var(--line); padding-top: 12px; font-size: 0.82rem; }
.page-head { padding: 40px 0 8px; background: var(--bg); border-bottom: 1px solid var(--line); }
.help-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 28px;
}
.side a { display: block; padding: 8px 0; border-bottom: 1px solid var(--line); color: var(--mute); }
.article { margin-bottom: 36px; }
.article .shot { margin: 14px 0; }
.policy { margin-top: 14px; padding: 14px; border: 1px solid var(--line); border-radius: 8px; }
@media (max-width: 900px) {
  .docs, .grid6, .cards, .review-grid, .split, .faq-layout, .footer, .help-layout, .cta-in {
    grid-template-columns: 1fr;
  }
  .toc { display: none; }
  .links { display: none; }
}
@media (max-width: 640px) {
  .scene-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}