:root {
  --bg: #f4f7fa;
  --ink: #0d2744;
  --mute: #4d6176;
  --line: #b9d0e6;
  --blue: #1565c0;
  --white: #fff;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "IBM Plex Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 100% 28px,
    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: #f4f7fa;
  border-bottom: 1px solid var(--blue);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 56px;
}
.brand { font-weight: 700; letter-spacing: 0.06em; }
.links { display: flex; gap: 18px; font-size: 0.88rem; color: var(--mute); }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--white);
  color: var(--blue);
  border: 1px solid var(--blue);
  font-weight: 700;
  padding: 8px 16px;
}
.ghost { padding: 8px 14px; color: var(--mute); }
.hero { padding: 48px 0 20px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 28px;
  align-items: center;
}
.kicker {
  font-family: "IBM Plex Mono", "Consolas", monospace;
  color: var(--blue);
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  margin-bottom: 8px;
}
.hero h1, .page-head h1 {
  font-size: clamp(1.65rem, 3.4vw, 2.35rem);
  line-height: 1.2;
}
.lead { color: var(--mute); margin: 10px 0 12px; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.spec {
  border: 1px solid var(--blue);
  background: var(--white);
  padding: 8px;
}
.spec img { width: 100%; height: 260px; object-fit: cover; }
.spec figcaption {
  font-family: "IBM Plex Mono", "Consolas", monospace;
  font-size: 0.72rem;
  color: var(--blue);
  padding: 8px 4px 2px;
  letter-spacing: 0.08em;
}
.section { padding: 72px 0; }
.head { margin-bottom: 26px; max-width: 38em; }
.grid6, .cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.card, .download-card, .review, .scene, .policy {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 16px;
}
.icon {
  font-family: "IBM Plex Mono", "Consolas", monospace;
  color: var(--blue);
  font-size: 0.76rem;
  margin-bottom: 6px;
}
.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 24px;
  align-items: center;
}
.split img, .shot img {
  width: 100%;
  object-fit: cover;
  border: 1px solid var(--blue);
}
.scene-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 16px 0 18px;
}
.scene { display: flex; gap: 8px; }
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.person { margin-top: 12px; color: var(--mute); display: flex; flex-direction: column; }
.visual { padding: 0 0 72px; }
.metrics { display: flex; gap: 22px; margin: 16px 0; }
.metrics b { display: block; font-size: 1.25rem; }
.metrics small { color: var(--mute); }
.faq-layout {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 28px;
}
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 68px; }
.cta-in {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  border: 1px solid var(--blue);
  background: var(--white);
  padding: 18px 20px;
}
footer {
  background: #0d2744;
  color: #c5d4e4;
  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: #7f97b0; margin-bottom: 8px; }
.footer a { display: block; margin: 6px 0; }
.copy { border-top: 1px solid #2a4666; padding-top: 12px; font-size: 0.82rem; }
.page-head { padding: 40px 0 8px; }
.help-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 28px;
}
.side a { display: block; padding: 8px 0; border-bottom: 1px solid var(--line); color: var(--mute); }
.article { margin-bottom: 36px; }
.article .shot { margin: 14px 0; }
.policy { margin-top: 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}}