:root {
  --bg: #f6f7fb;
  --ink: #1c2430;
  --mute: #5c6778;
  --white: #fff;
  --accent: #3f51b5;
  --lift: 0 8px 24px rgba(28,36,48,0.08);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Roboto", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
}
img { max-width:100%;height:auto; display: block; }
a { color: inherit; text-decoration: none; }
.wrap { width: min(1080px, calc(100% - 40px)); margin-inline: auto; }
nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--white);
  box-shadow: var(--lift);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 60px;
}
.brand { font-weight: 700; }
.links { display: flex; gap: 18px; font-size: 0.9rem; color: var(--mute); }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: #fff;
  font-weight: 650;
  padding: 10px 18px;
  border-radius: 8px;
}
.ghost { padding: 10px 14px; color: var(--mute); }
.hero { padding: 52px 0 24px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 28px;
  align-items: center;
}
.sheet, .card, .download-card, .review, .scene, .policy, .cta-in {
  background: var(--white);
  border-radius: 16px;
  box-shadow: var(--lift);
}
.sheet { padding: 28px 26px; }
.hero-grid > img, .split img, .shot img {
  width: 100%;
  object-fit: cover;
  border-radius: 16px;
  box-shadow: var(--lift);
}
.kicker { color: var(--accent); letter-spacing: 0.04em; margin-bottom: 8px; }
.hero h1, .page-head h1 {
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  line-height: 1.2;
}
.lead { color: var(--mute); margin: 10px 0 14px; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.section { padding: 76px 0; }
.head { margin-bottom: 26px; max-width: 38em; }
.grid6, .cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.card, .download-card { padding: 18px; }
.icon { color: var(--accent); font-size: 0.78rem; margin-bottom: 6px; }
.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 28px;
  align-items: center;
}
.scene-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 16px 0 18px;
}
.scene { padding: 10px 12px; display: flex; gap: 8px; }
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.review { padding: 16px; }
.person { margin-top: 12px; color: var(--mute); display: flex; flex-direction: column; }
.visual { padding: 0 0 76px; }
.metrics { display: flex; gap: 22px; margin: 16px 0; }
.metrics b { display: block; font-size: 1.3rem; }
.metrics small { color: var(--mute); }
.faq-layout {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 28px;
}
details { border-bottom: 1px solid #e4e7ee; padding: 12px 0; }
summary { cursor: pointer; font-weight: 650; }
details p { margin-top: 8px; color: var(--mute); }
.cta { padding: 10px 0 72px; }
.cta-in {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 22px 24px;
}
footer {
  background: #1c2430;
  color: #c5ccd6;
  padding: 36px 0 18px;
}
.footer {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}
.footer .brand { color: #fff; }
.footer h4 { color: #8b95a4; margin-bottom: 8px; }
.footer a { display: block; margin: 6px 0; }
.copy { border-top: 1px solid #334050; padding-top: 12px; font-size: 0.82rem; }
.page-head { padding: 44px 0 10px; }
.help-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 28px;
}
.side a { display: block; padding: 8px 0; color: var(--mute); }
.article { margin-bottom: 36px; }
.article .shot { margin: 14px 0; }
.policy { margin-top: 14px; padding: 14px; }
@media (max-width: 900px) {
  .hero-grid, .grid6, .cards, .review-grid, .split, .faq-layout, .footer, .help-layout, .cta-in {
    grid-template-columns: 1fr;
  }
  .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}}