:root {
  --paper: #f4efe6;
  --paper-2: #ebe4d6;
  --ink: #1c1915;
  --muted: #5e564c;
  --line: #d9d0c2;
  --copper: #b5522a;
  --copper-deep: #8c3d1e;
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.7;
}
a { color: inherit; }
img, svg { display: block; max-width: 100%; }

.top {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px 7vw;
  background: rgba(244, 239, 230, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.mark {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.12em;
}
.mark-seal {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1.5px solid var(--ink);
  border-radius: 50%;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: 16px;
}
.top nav { display: flex; gap: 22px; }
.top nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.16em;
}
.top nav a:hover { color: var(--ink); }

.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: end;
  max-width: var(--max);
  margin: 0 auto;
  padding: 72px 7vw 88px;
}
.kicker {
  margin: 0 0 18px;
  color: var(--copper-deep);
  letter-spacing: 0.22em;
  font-size: 13px;
}
h1, h2, h3 { font-family: "Songti SC", "STSong", "SimSun", serif; font-weight: 600; }
h1 {
  margin: 0;
  font-size: clamp(46px, 6vw, 84px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}
.en {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 15px;
  letter-spacing: 0.01em;
}
.lead {
  max-width: 36em;
  margin: 18px 0 0;
  font-size: 18px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}
.btn {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 18px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  letter-spacing: 0.06em;
}
.btn-quiet {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}

.instrument { margin: 0; }
.instrument-svg { width: 100%; height: auto; }
.frame { fill: #fbf8f2; stroke: var(--ink); stroke-width: 1.5; }
.corners { fill: none; stroke: var(--copper); stroke-width: 2; }
.part { fill: #e7dfd1; stroke: var(--ink); stroke-width: 1; }
.scan {
  fill: none;
  stroke: var(--copper);
  stroke-width: 2;
  stroke-dasharray: 8 6;
  animation: sweep 2.8s ease-in-out infinite;
}
.defect { fill: var(--copper); }
.hud {
  fill: var(--muted);
  font-size: 13px;
  letter-spacing: 0.18em;
  font-family: "Segoe UI", "PingFang SC", sans-serif;
}
.instrument figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.12em;
}
@keyframes sweep {
  0%, 100% { transform: translateY(-28px); opacity: 0.35; }
  50% { transform: translateY(28px); opacity: 1; }
}

.work, .visit, .contact { padding: 72px 7vw; }
.work { background: #fbf8f2; border-top: 1px solid var(--line); }
.section-head h2, .visit h2, .contact .phone {
  margin: 0;
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1.15;
}
.work ol, .visit ol {
  list-style: none;
  margin: 36px auto 0;
  padding: 0;
  max-width: var(--max);
}
.work ol li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 18px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}
.work ol li span {
  font-family: "Songti SC", "STSong", serif;
  font-size: 22px;
  color: var(--copper);
}
.work h3 { margin: 0 0 6px; font-size: 28px; }
.work p { margin: 0; max-width: 40em; }
.work .en { margin-top: 8px; }

.visit {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 40px;
  max-width: calc(var(--max) + 14vw);
  margin: 0 auto;
}
.visit ol {
  display: grid;
  gap: 0;
  margin: 0;
}
.visit li {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}
.visit strong {
  font-family: "Songti SC", "STSong", serif;
  font-size: 28px;
  font-weight: 600;
}

.contact {
  background: var(--ink);
  color: var(--paper);
}
.contact .kicker { color: #e7b5a4; }
.phone {
  display: inline-block;
  margin-top: 8px;
  color: var(--paper);
  text-decoration: none;
  font-family: "Songti SC", "STSong", serif;
  font-size: clamp(40px, 6vw, 72px);
  letter-spacing: 0.04em;
  line-height: 1;
}
.mail {
  display: block;
  margin-top: 12px;
  color: #e7d7cb;
  letter-spacing: 0.04em;
}
.contact dl {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  max-width: var(--max);
  margin: 48px 0 0;
}
.contact dt {
  color: #b7aa9e;
  letter-spacing: 0.18em;
  font-size: 13px;
}
.contact dd { margin: 8px 0 0; }

footer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  padding: 28px 7vw 40px;
  color: var(--muted);
  font-size: 14px;
  border-top: 1px solid var(--line);
}
footer p { margin: 0; }
footer a { color: var(--ink); }

@media (max-width: 860px) {
  .hero, .visit, .contact dl { grid-template-columns: 1fr; }
  .hero { padding-top: 40px; }
  .work ol li, .visit li { grid-template-columns: 52px 1fr; }
  .top { padding-inline: 20px; }
  .hero, .work, .visit, .contact, footer { padding-inline: 20px; }
}