:root {
  --ink: #1a1a1a;
  --mute: #444;
  --line: #ddd;
  --bg: #fafafa;
  --white: #fff;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--white);
  font-size: 21px;
  line-height: 1.8;
}
img { max-width:100%;height:auto; display: block; }
a { color: inherit; text-decoration: none; }
.wrap { width: min(980px, calc(100% - 48px)); margin-inline: auto; }
nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--white);
  border-bottom: 2px solid var(--ink);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 72px;
}
.brand { font-weight: 800; font-size: 1.15em; }
.links { display: flex; gap: 22px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--ink);
  color: var(--white);
  font-weight: 700;
  padding: 12px 22px;
  font-size: 1em;
}
.ghost { padding: 12px 16px; border-bottom: 2px solid var(--ink); }
.hero { padding: 64px 0 40px; }
.kicker { font-size: 1em; letter-spacing: 0.06em; margin-bottom: 12px; }
.hero h1, .page-head h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.25;
  font-weight: 800;
}
.lead { margin: 16px 0; }
.hero img {
  width: 100%;
  margin-top: 32px;
  border: 2px solid var(--ink);
}
.actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 24px; }
.section { padding: 88px 0; }
.head { margin-bottom: 32px; }
.grid6, .cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.card, .download-card {
  background: var(--bg);
  padding: 24px;
  border: 2px solid var(--ink);
}
.icon { font-weight: 800; margin-bottom: 8px; }
.split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.split img, .shot img {
  width: 100%;
  border: 2px solid var(--ink);
}
.scene-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 20px 0;
}
.scene {
  border: 2px solid var(--ink);
  padding: 14px 16px;
  display: flex;
  gap: 12px;
}
.review-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.review { border-top: 4px solid var(--ink); padding: 20px 0; }
.person { margin-top: 16px; display: flex; flex-direction: column; color: var(--mute); }
.visual { padding: 0 0 88px; }
.metrics { display: flex; gap: 28px; margin: 20px 0; flex-wrap: wrap; }
.metrics b { display: block; font-size: 1.4em; }
.faq-layout { display: grid; gap: 24px; }
details { border-bottom: 2px solid var(--line); padding: 16px 0; }
summary { cursor: pointer; font-weight: 800; }
details p { margin-top: 10px; color: var(--mute); }
.cta { background: var(--bg); padding: 48px 0; border-top: 2px solid var(--ink); }
.cta-in { display: flex; justify-content: space-between; gap: 24px; align-items: center; flex-wrap: wrap; }
footer {
  background: var(--ink);
  color: #eee;
  padding: 48px 0 24px;
  font-size: 18px;
}
.footer {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}
.footer .brand { color: #fff; }
.footer h4 { margin-bottom: 10px; }
.footer a { display: block; margin: 8px 0; }
.copy { border-top: 1px solid #555; padding-top: 16px; }
.page-head { padding: 56px 0 16px; }
.help-layout { display: grid; gap: 28px; }
.side a { display: block; padding: 10px 0; border-bottom: 2px solid var(--line); }
.article { margin-bottom: 40px; }
.article .shot { margin: 16px 0; }
.policy { margin-top: 16px; padding: 18px; border: 2px solid var(--ink); }
@media (min-width: 900px) {
  .grid6, .cards, .review-grid { grid-template-columns: 1fr 1fr; }
  .split, .faq-layout, .footer, .help-layout { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 800px) {
  .links { display: none; }
  body { font-size: 20px; }
}

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