:root {
  --board: #f3efe4;
  --ink: #2a2a28;
  --marker: #1a4d8c;
  --red: #b42318;
  --mute: #5c5a52;
  --line: #cfc8b6;
  --white: #fffdf8;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "KaiTi", "STKaiti", "Songti SC", "SimSun", serif;
  color: var(--ink);
  background: var(--board);
  line-height: 1.65;
  background-image:
    linear-gradient(rgba(42,42,40,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42,42,40,0.04) 1px, transparent 1px);
  background-size: 28px 28px;
}
img { max-width:100%;height:auto; display: block; }
a { color: inherit; text-decoration: none; }
.wrap { width: min(1040px, calc(100% - 40px)); margin-inline: auto; }
nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(243,239,228,0.94);
  border-bottom: 2px solid var(--ink);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 60px;
}
.brand { font-weight: 700; letter-spacing: 0.06em; }
.links {
  display: flex;
  gap: 20px;
  font-size: 0.92rem;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--ink);
  background: transparent;
  padding: 8px 16px;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 700;
}
.button:hover { background: var(--ink); color: var(--board); }
.ghost {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border-bottom: 2px solid var(--marker);
  font-family: "PingFang SC", sans-serif;
}
.hero { padding: 56px 0 40px; }
.kicker {
  font-family: "PingFang SC", sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--marker);
  margin-bottom: 8px;
}
.hero h1, .page-head h1 {
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  line-height: 1.25;
}
.thesis {
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  color: var(--marker);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 6px;
  margin: 10px 0 14px;
}
.lead { font-family: "PingFang SC", sans-serif; color: var(--mute); margin-bottom: 8px; }
.hero p { font-family: "PingFang SC", "Microsoft YaHei", sans-serif; }
.board {
  max-width: 480px;
  margin: 28px 0;
  padding: 18px;
  border: 2px solid var(--ink);
}
.layer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 10px;
  border: 2px dashed var(--ink);
  font-family: "PingFang SC", sans-serif;
}
.layer.top { border-style: solid; }
.layer.mid { border-color: var(--marker); color: var(--marker); }
.layer.bot { border-color: var(--red); }
.arrow {
  text-align: center;
  padding: 4px 0;
  color: var(--marker);
  font-family: "PingFang SC", sans-serif;
}
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.section { padding: 76px 0; }
.head { margin-bottom: 28px; max-width: 38em; }
.head p, .card p, .section p, details, footer, .person, .scene, .metrics {
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}
.grid6, .cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.card, .download-card {
  background: var(--white);
  border: 2px solid var(--ink);
  padding: 18px;
}
.icon { color: var(--marker); margin-bottom: 6px; font-family: "PingFang SC", sans-serif; }
.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 28px;
  align-items: center;
}
.split img, .shot img, .cta img {
  width: 100%;
  object-fit: cover;
  border: 2px solid var(--ink);
}
.scene-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 16px 0 18px;
}
.scene {
  border: 2px dashed var(--line);
  padding: 10px 12px;
  display: flex;
  gap: 8px;
}
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.review {
  background: var(--white);
  padding: 16px;
  border-left: 4px solid var(--marker);
}
.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: 1.4rem; color: var(--marker); }
.faq-layout {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 28px;
}
details { border-bottom: 2px dashed var(--line); padding: 12px 0; }
summary { cursor: pointer; font-weight: 700; font-family: "PingFang SC", sans-serif; }
details p { margin-top: 8px; color: var(--mute); }
.cta { border-top: 2px solid var(--ink); padding: 36px 0; }
.cta-in {
  display: grid;
  grid-template-columns: 0.7fr 1.1fr auto;
  gap: 20px;
  align-items: center;
}
.cta img { height: 120px; object-fit: cover; }
footer {
  background: var(--ink);
  color: #ddd6c6;
  padding: 36px 0 18px;
  font-family: "PingFang SC", sans-serif;
}
.footer {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}
.footer .brand { color: var(--board); }
.footer h4 { color: #9cb6d8; margin-bottom: 8px; }
.footer a { display: block; margin: 6px 0; }
.copy { border-top: 1px solid #444; padding-top: 12px; font-size: 0.82rem; }
.page-head { padding: 48px 0 12px; }
.help-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 28px;
}
.side a {
  display: block;
  padding: 8px 0;
  border-bottom: 2px dashed var(--line);
  font-family: "PingFang SC", sans-serif;
}
.article { margin-bottom: 36px; }
.article .shot { margin: 14px 0; }
.policy { margin-top: 14px; padding: 14px; background: var(--white); border: 2px solid var(--ink); }
@media (max-width: 900px) {
  .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}}