:root {
  --bg: #f3f6f4;
  --ink: #1c2b27;
  --mute: #5d6e68;
  --line: #d5ddd8;
  --white: #ffffff;
  --teal: #1f9a7a;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Avenir Next", "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: rgba(243,246,244,0.93);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 56px;
}
.brand { font-weight: 750; }
.links { display: flex; gap: 18px; font-size: 0.9rem; color: var(--mute); }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--teal);
  color: #fff;
  font-weight: 700;
  padding: 10px 16px;
  border-radius: 6px;
}
.ghost { padding: 10px 12px; color: var(--mute); }
.hero {
  position: relative;
  padding: 56px 0 40px;
  overflow: hidden;
}
.iso {
  position: absolute;
  inset: 0;
  opacity: 0.18;
  background-image:
    linear-gradient(30deg, #c9d6d0 12%, transparent 12.5%),
    linear-gradient(150deg, #c9d6d0 12%, transparent 12.5%),
    linear-gradient(30deg, transparent 87.5%, #c9d6d0 88%),
    linear-gradient(150deg, transparent 87.5%, #c9d6d0 88%);
  background-size: 72px 42px;
  pointer-events: none;
}
.iso::before {
  content: "";
  position: absolute;
  left: 8%;
  top: 22%;
  width: 84px;
  height: 48px;
  box-shadow:
    120px 18px 0 0 #c3d0c9,
    210px 40px 0 0 #c3d0c9,
    320px 8px 0 0 #c3d0c9,
    430px 28px 0 0 #c3d0c9,
    540px 12px 0 0 #c3d0c9;
  background: #c3d0c9;
  transform: skewX(-28deg);
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
  align-items: center;
}
.kicker { color: var(--teal); letter-spacing: 0.06em; margin-bottom: 8px; }
.hero h1, .page-head h1 {
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  line-height: 1.22;
}
.lead { color: var(--mute); margin: 10px 0 16px; }
.hero .button { margin-top: 8px; }
.fore { position: relative; }
.fore img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border: 1px solid var(--line);
  background: #fff;
}
.dot {
  position: absolute;
  right: 14px;
  top: 14px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 6px rgba(31,154,122,0.16);
}
.section { padding: 72px 0; }
.head { margin-bottom: 24px; max-width: 38em; }
.grid6, .cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.card, .download-card, .review, .scene, .policy {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 16px;
}
.icon { color: var(--teal); 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;
}
.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: 12px;
}
.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 64px; }
.cta-in {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  border-top: 1px solid var(--teal);
  padding-top: 22px;
}
footer {
  background: #1c2b27;
  color: #c5d4ce;
  padding: 32px 0 16px;
}
.footer {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 18px;
  margin-bottom: 16px;
}
.footer .brand { color: #fff; }
.footer h4 { color: #7d9189; margin-bottom: 8px; }
.footer a { display: block; margin: 6px 0; }
.copy { border-top: 1px solid #31443e; padding-top: 12px; font-size: 0.8rem; }
.page-head { padding: 40px 0 8px; }
.help-layout {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 28px;
}
.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) {
  .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}}