:root {
  --ink: #161616;
  --muted: #5e594f;
  --line: #d9d3c7;
  --paper: #f6f3ec;
  --yellow: #f3c200;
  --white: #fffcf7;
}

* { 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", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

img { max-width: 100%; display: block; }

a { color: inherit; }

button, summary { font: inherit; }

h1, h2, h3 {
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-weight: 500;
  letter-spacing: 0.06em;
  line-height: 1.2;
  margin: 0;
}

.wrap {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 76px;
  padding: 0 28px;
  background: rgba(246, 243, 236, 0.94);
  border-bottom: 1px solid var(--ink);
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  min-width: 0;
}

.brand img {
  width: 48px;
  height: 48px;
  object-fit: cover;
}

.brand strong,
.brand em {
  display: block;
  font-style: normal;
}

.brand strong {
  font-size: 16px;
  letter-spacing: 0.14em;
}

.brand em {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.nav {
  display: flex;
  gap: 28px;
}

.nav a {
  text-decoration: none;
  font-size: 15px;
  letter-spacing: 0.12em;
}

.nav a:hover { color: #8a6a00; }

.nav-toggle {
  display: none;
  border: 1px solid var(--ink);
  background: transparent;
  height: 36px;
  padding: 0 12px;
  letter-spacing: 0.12em;
  cursor: pointer;
}

.hero {
  display: grid;
  grid-template-columns: minmax(320px, 0.86fr) 1.14fr;
  min-height: calc(100vh - 76px);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 64px 56px 72px;
  background: var(--yellow);
}

.hero h1 {
  font-size: clamp(64px, 8vw, 104px);
  letter-spacing: 0.12em;
}

.lead {
  max-width: 28em;
  margin: 22px 0 0;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 22px;
  border: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  text-decoration: none;
  letter-spacing: 0.14em;
  font-size: 14px;
}

.btn-fill {
  background: var(--ink);
  color: var(--yellow);
}

.btn:hover { transform: translateY(-1px); }

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 420px;
}

.platform { padding: 96px 0 0; }

.platform-head { max-width: 760px; }

.platform h2,
.section-title h2,
.steps h2,
.faq h2,
.join h2,
.about h2,
.open h2,
.travel h2 {
  font-size: clamp(32px, 4vw, 48px);
  margin-bottom: 18px;
}

.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 56px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ink);
}

.principles li {
  padding: 32px 28px 40px;
  border-right: 1px solid var(--ink);
}

.principles li:last-child { border-right: 0; }

.principles span,
.steps span {
  display: block;
  margin-bottom: 18px;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: 28px;
}

.principles h3,
.service-grid h3,
.steps h3,
.join strong {
  font-size: 22px;
  margin-bottom: 10px;
}

.principles p,
.service-grid p,
.steps p,
.join span,
.faq p,
.about p,
.travel p,
.footer-grid p,
.open p {
  margin: 0;
  color: var(--muted);
}

.services { padding: 96px 0 28px; }

.section-title { margin-bottom: 36px; }

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.service-grid img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  margin-bottom: 18px;
}

.index {
  margin: 0 0 8px;
  letter-spacing: 0.18em;
  font-size: 13px;
  color: var(--ink);
}

.note {
  margin: 22px auto 0;
  color: var(--muted);
  font-size: 13px;
}

.travel {
  position: relative;
  margin-top: 72px;
  min-height: 560px;
  display: grid;
  align-items: end;
  color: var(--white);
}

.travel img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.travel-copy {
  position: relative;
  width: min(640px, calc(100% - 48px));
  margin: 0 0 48px 6vw;
  padding: 28px 28px 24px;
  background: rgba(18, 18, 18, 0.72);
}

.travel p:last-child { color: #efe8da; }

.steps { padding: 96px 0; }

.steps ol {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.steps li {
  display: flex;
  gap: 20px;
  padding: 28px 8px;
  border-bottom: 1px solid var(--line);
}

.join {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  background: var(--white);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.join-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 420px;
}

.join-copy { padding: 64px 56px; }

.join ul {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.join li {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.join li:last-child { border-bottom: 1px solid var(--line); }

.join span { display: block; font-weight: 400; }

.aside {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.faq { padding: 96px 0; }

.faq-list { margin-top: 12px; border-top: 1px solid var(--ink); }

.faq details { border-bottom: 1px solid var(--line); }

.faq summary {
  cursor: pointer;
  padding: 20px 0;
  letter-spacing: 0.04em;
  list-style: none;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::after {
  content: "+";
  float: right;
  font-family: "Songti SC", "STSong", "SimSun", serif;
}

.faq details[open] summary::after { content: "–"; }

.faq details p { padding: 0 0 20px; max-width: 46em; }

.about { padding: 0 0 96px; }

.about-grid {
  max-width: 820px;
}

.facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px 24px;
  margin: 32px 0 0;
}

.facts div { margin: 0; }

.fact-wide { grid-column: 1 / -1; }

.facts dt {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.facts dd { margin: 4px 0 0; }

.open {
  background: var(--yellow);
  padding: 88px 0;
}

.open h2 { letter-spacing: 0.1em; }

.open p:last-child {
  margin-top: 12px;
  color: var(--ink);
  letter-spacing: 0.12em;
}

.site-footer {
  background: var(--ink);
  color: #f4efe4;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 36px;
  padding: 48px 0 36px;
}

.footer-grid strong {
  display: block;
  margin-bottom: 10px;
  letter-spacing: 0.08em;
}

.footer-grid p { color: #cfc6b6; }

.beian-bar {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 18px 20px 22px;
  border-top: 1px solid rgba(243, 194, 0, 0.45);
  background: #0d0d0d;
  text-align: center;
}

.beian-bar p {
  margin: 0;
  color: #cfc6b6;
  font-size: 13px;
}

.beian-bar a {
  color: var(--yellow);
  font-size: 16px;
  letter-spacing: 0.06em;
  text-underline-offset: 4px;
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; align-items: center; }

  .nav {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 8px 28px 18px;
    background: var(--paper);
    border-bottom: 1px solid var(--ink);
  }

  .nav.is-open { display: flex; }

  .nav a { padding: 12px 0; border-top: 1px solid var(--line); }

  .brand em { display: none; }

  .hero,
  .principles,
  .service-grid,
  .steps ol,
  .join,
  .footer-grid,
  .facts {
    grid-template-columns: 1fr;
  }

  .hero-copy,
  .join-copy { padding: 40px 24px 48px; }

  .principles li { border-right: 0; border-bottom: 1px solid var(--ink); }

  .wrap { width: min(1120px, calc(100% - 40px)); }

  .travel { min-height: 480px; }

  .travel-copy { margin: 0 20px 24px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn:hover { transform: none; }
}