:root {
  --bg: #fff;
  --ink: #111;
  --mute: #666;
  --line: #ddd;
  --grid: rgba(17,17,17,0.08);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
img { max-width:100%;height:auto; display: block; }
a { color: inherit; text-decoration: none; }
.grid {
  width: min(1200px, calc(100% - 32px));
  margin-inline: auto;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
  background-image: repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px calc(100% / 12));
  background-size: 100% 100%;
}
.span3 { grid-column: span 3; }
.span4 { grid-column: span 4; }
.span6 { grid-column: span 6; }
.span8 { grid-column: span 8; }
.span9 { grid-column: span 9; }
.span12 { grid-column: span 12; }
nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: #fff;
  border-bottom: 1px solid var(--ink);
}
.nav {
  align-items: center;
  min-height: 56px;
  padding-block: 8px;
}
.brand { font-weight: 750; grid-column: span 3; }
.links { grid-column: span 6; display: flex; gap: 16px; font-size: 0.88rem; color: var(--mute); }
.nav .button { grid-column: span 3; justify-self: end; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--ink);
  color: #fff;
  font-weight: 700;
  padding: 10px 14px;
}
.ghost { padding: 10px 0; color: var(--mute); }
.hero { padding: 40px 0 16px; }
.kicker { letter-spacing: 0.12em; font-size: 0.8rem; }
.hero h1, .page-head h1 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.2;
  grid-column: span 8;
}
.lead { color: var(--mute); }
.hero img { width: 100%; height: 220px; object-fit: cover; }
.mods a {
  display: block;
  border-top: 1px solid var(--ink);
  padding: 14px 0;
  font-weight: 700;
}
.section { padding: 64px 0; }
.head { margin-bottom: 8px; }
.card, .download-card, .review, .scene, .policy {
  border-top: 1px solid var(--ink);
  padding: 14px 0 8px;
}
.shot img, .split img, .visual img {
  width: 100%;
  object-fit: cover;
}
.scene-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 16px 0 18px;
}
.person { margin-top: 12px; color: var(--mute); display: flex; flex-direction: column; }
.visual { padding: 0 0 64px; }
.metrics { display: flex; gap: 22px; margin: 16px 0; }
.metrics b { display: block; }
.metrics small { color: var(--mute); }
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 { padding: 8px 0 56px; }
.cta-in { align-items: center; border-top: 1px solid var(--ink); padding-top: 20px; }
footer {
  background: var(--ink);
  color: #ccc;
  padding: 28px 0 14px;
}
.footer { margin-bottom: 12px; }
.footer .brand { color: #fff; }
.footer h4 { color: #888; margin-bottom: 8px; }
.footer a { display: block; margin: 6px 0; }
.copy { border-top: 1px solid #333; padding-top: 10px; font-size: 0.8rem; }
.page-head { padding: 40px 0 8px; }
.help-layout { align-items: start; }
.side a { display: block; padding: 8px 0; border-bottom: 1px solid var(--line); color: var(--mute); }
.article { margin-bottom: 32px; }
.article .shot { margin: 14px 0; }
.policy { margin-top: 14px; }
@media (max-width: 900px) {
  .span3, .span4, .span6, .span8, .span9, .span12, .brand, .links, .nav .button {
    grid-column: span 12;
  }
  .links { display: none; }
  .grid { background-image: 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}}