:root {
  --ink: #3a4450;
  --paper: #f7f6f2;
  --line: #d9ddd8;
  --arc: #8aa0ae;
  --muted: #7a838c;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Avenir Next", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { max-width:100%;height:auto; display: block; }
.wrap { width: min(1040px, calc(100% - 40px)); margin: 0 auto; }
nav {
  position: sticky; top: 0; z-index: 20;
  background: rgba(247, 246, 242, .92);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; gap: 24px; min-height: 64px; }
.brand { font-weight: 600; letter-spacing: .18em; font-size: 13px; text-transform: uppercase; }
.links { display: flex; gap: 20px; margin-left: auto; font-size: 13px; color: var(--muted); }
.button {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 9px 18px; border: 1px solid var(--ink); background: transparent;
  font-size: 13px; letter-spacing: .08em;
}
.ghost { display: inline-flex; align-items: center; color: var(--muted); border-bottom: 1px solid var(--line); }
.hero { position: relative; padding: 64px 0 20px; overflow: hidden; }
.arcs {
  position: absolute; inset: 0; width: 100%; height: 420px; pointer-events: none;
}
.arcs path {
  fill: none; stroke: var(--arc); stroke-width: 1; opacity: .28;
}
.arcs circle { fill: var(--arc); opacity: .45; }
.kicker { font-size: 13px; letter-spacing: .16em; color: var(--muted); margin-bottom: 16px; }
h1 { font-size: clamp(28px, 4vw, 44px); font-weight: 500; line-height: 1.25; margin-bottom: 14px; }
.lead { font-size: 17px; margin-bottom: 10px; }
.actions { display: flex; gap: 16px; align-items: center; margin: 24px 0 32px; }
.hero figure img { width: 100%; height: 280px; object-fit: cover; opacity: .92; }
.hero figcaption { margin-top: 8px; font-size: 12px; letter-spacing: .14em; color: var(--muted); }
.section { padding: 72px 0; }
.head { max-width: 560px; margin-bottom: 28px; }
h2 { font-size: 24px; font-weight: 500; margin-bottom: 8px; }
.grid6 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px 24px; }
.card { padding-top: 14px; border-top: 1px solid var(--line); }
.icon { font-size: 11px; letter-spacing: .16em; color: var(--arc); margin-bottom: 8px; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.split img, .shot img { width: 100%; height: 300px; object-fit: cover; }
.scene-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 16px; margin: 16px 0 22px; }
.scene { display: flex; gap: 8px; padding: 8px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.review { padding-top: 12px; border-top: 1px solid var(--line); }
.person { margin-top: 12px; display: flex; flex-direction: column; font-size: 13px; }
.person small { color: var(--muted); }
.visual { padding: 0 0 72px; }
.metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 18px 0 22px; }
.metrics div { padding-top: 8px; border-top: 1px solid var(--line); }
.metrics b { display: block; font-size: 20px; font-weight: 500; }
.faq-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: 40px; }
details { padding: 12px 0; border-bottom: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; }
details p { margin-top: 8px; color: var(--muted); }
.cta { padding: 48px 0; border-top: 1px solid var(--line); }
.cta-in { display: flex; justify-content: space-between; align-items: center; gap: 20px; }
footer { padding: 40px 0 20px; border-top: 1px solid var(--line); }
.footer { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 18px; }
.footer h4 { margin-bottom: 8px; font-size: 12px; letter-spacing: .12em; font-weight: 600; }
.footer a, .footer p { display: block; color: var(--muted); font-size: 13px; margin-top: 6px; }
.copy { margin-top: 20px; font-size: 12px; color: var(--muted); }
.page-head { padding: 56px 0 8px; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.download-card { padding-top: 16px; border-top: 1px solid var(--ink); }
.help-layout { display: grid; grid-template-columns: 190px 1fr; gap: 32px; }
.side { position: sticky; top: 84px; align-self: start; }
.side a { display: block; padding: 8px 0; color: var(--muted); border-bottom: 1px solid var(--line); font-size: 13px; }
.article { padding: 8px 0 28px; }
.policy { margin-top: 16px; padding-top: 12px; color: var(--muted); }
@media (max-width: 900px) {
  .links { display: none; }
  .split, .faq-layout, .help-layout, .cta-in, .cards, .footer { grid-template-columns: 1fr; }
  .grid6, .review-grid { grid-template-columns: 1fr 1fr; }
  .hero figure img, .split img, .shot img { height: 210px; }
}
@media (max-width: 560px) {
  .grid6, .review-grid, .metrics { grid-template-columns: 1fr; }
}

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