:root {
  --ink: #000;
  --paper: #fff;
  --mark: #ffd400;
  --mute: #111;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-size: 22px;
  line-height: 1.55;
}
img { max-width:100%;height:auto; display: block; }
a { color: inherit; }
a:focus, .button:focus, summary:focus {
  outline: 4px solid var(--mark);
  outline-offset: 3px;
}
.wrap { width: min(960px, calc(100% - 32px)); margin-inline: auto; }
nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--ink);
  color: var(--paper);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 80px;
}
.brand { font-weight: 800; font-size: 1.2em; text-decoration: none; color: var(--mark); }
.links { display: flex; gap: 18px; }
.links a { color: var(--paper); font-weight: 700; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  min-width: 160px;
  padding: 14px 28px;
  background: var(--mark);
  color: var(--ink);
  font-weight: 800;
  font-size: 1.05em;
  text-decoration: none;
  border: 4px solid var(--ink);
}
.ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  padding: 14px 22px;
  border: 4px solid var(--ink);
  font-weight: 800;
  text-decoration: none;
}
.hero { padding: 48px 0 36px; }
.kicker { background: var(--mark); display: inline-block; padding: 6px 10px; font-weight: 800; margin-bottom: 12px; }
.hero h1, .page-head h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.4rem);
  line-height: 1.15;
}
.lead { margin: 16px 0; font-weight: 600; }
.hero img, .split img, .shot img {
  width: 100%;
  border: 4px solid var(--ink);
  margin-top: 24px;
}
.actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 24px; }
.section { padding: 64px 0; }
.head { margin-bottom: 24px; }
.grid6, .cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.card, .download-card {
  border: 4px solid var(--ink);
  padding: 20px;
}
.icon { font-weight: 800; background: var(--mark); display: inline-block; padding: 2px 8px; margin-bottom: 8px; }
.split { display: grid; gap: 20px; }
.split img { margin-top: 0; }
.scene-grid { display: grid; gap: 10px; margin: 16px 0 20px; }
.scene {
  border: 4px solid var(--ink);
  padding: 16px;
  display: flex;
  gap: 12px;
  font-weight: 700;
}
.review-grid { display: grid; gap: 14px; }
.review { border-left: 12px solid var(--mark); border: 4px solid var(--ink); padding: 18px; }
.person { margin-top: 12px; font-weight: 700; display: flex; flex-direction: column; }
.visual { padding: 0 0 64px; }
.metrics { display: flex; gap: 20px; margin: 18px 0; flex-wrap: wrap; }
.metrics b { display: block; font-size: 1.3em; }
.faq-layout { display: grid; gap: 20px; }
details { border: 4px solid var(--ink); padding: 14px; margin-bottom: 10px; }
summary { cursor: pointer; font-weight: 800; }
details p { margin-top: 10px; }
.cta { background: var(--mark); padding: 36px 0; border-top: 4px solid var(--ink); }
.cta-in { display: flex; justify-content: space-between; gap: 20px; align-items: center; flex-wrap: wrap; }
footer {
  background: var(--ink);
  color: var(--paper);
  padding: 40px 0 20px;
}
.footer { display: grid; gap: 20px; margin-bottom: 20px; }
.footer .brand { color: var(--mark); }
.footer h4 { color: var(--mark); margin-bottom: 8px; }
.footer a { display: block; margin: 8px 0; color: var(--paper); font-weight: 700; }
.copy { border-top: 2px solid #555; padding-top: 14px; }
.page-head { padding: 40px 0 12px; }
.help-layout { display: grid; gap: 20px; }
.side a { display: block; padding: 14px 0; border-bottom: 4px solid var(--ink); font-weight: 800; text-decoration: none; }
.article { margin-bottom: 36px; }
.article .shot { margin: 16px 0; }
.policy { margin-top: 16px; padding: 16px; border: 4px solid var(--ink); }
@media (min-width: 900px) {
  .grid6, .cards, .review-grid, .split, .faq-layout, .footer, .help-layout {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 800px) {
  .links { display: none; }
}

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