:root {
  --geo-bg: #07111f;
  --geo-gold: #e8c97a;
  --geo-gold-dark: #c8a45c;
  --geo-line: rgba(255, 255, 255, 0.1);
  --geo-max: 1180px;
  --geo-muted: #aebdd0;
  --geo-panel: #0d1b2e;
  --geo-panel-soft: #12243b;
  --geo-text: #eaf0f7;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--geo-bg);
  color: var(--geo-text);
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}
a { color: inherit; }
img, video { display: block; width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7, 17, 31, 0.94);
  border-bottom: 1px solid var(--geo-line);
  backdrop-filter: blur(16px);
}
.header-inner {
  width: min(calc(100% - 40px), var(--geo-max));
  min-height: 78px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}
.brand { display: flex; align-items: center; gap: 14px; text-decoration: none; }
.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(232, 201, 122, 0.5);
  color: var(--geo-gold);
  font-weight: 800;
  letter-spacing: 0.08em;
}
.brand-cn { display: block; font-size: 16px; font-weight: 700; line-height: 1.25; }
.brand-en { display: block; color: var(--geo-muted); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; }
.main-nav { display: flex; align-items: center; gap: 25px; }
.main-nav a { color: var(--geo-muted); font-size: 14px; text-decoration: none; }
.main-nav a:hover, .main-nav a[aria-current="page"] { color: var(--geo-gold); }
.preview-badge {
  padding: 5px 10px;
  border: 1px solid rgba(232, 201, 122, 0.35);
  color: var(--geo-gold);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.container { width: min(calc(100% - 40px), var(--geo-max)); margin: auto; }
main { min-height: 70vh; }
.hero {
  position: relative;
  min-height: 630px;
  display: grid;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--geo-line);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(7,17,31,.97) 0%, rgba(7,17,31,.84) 50%, rgba(7,17,31,.35) 100%), var(--hero-image) center/cover no-repeat;
}
.hero-content { position: relative; max-width: 760px; padding: 90px 0 110px; }
.eyebrow { color: var(--geo-gold); font-size: 13px; font-weight: 700; letter-spacing: .15em; text-transform: uppercase; }
h1, h2, h3 { margin: 0 0 18px; color: var(--geo-text); line-height: 1.18; }
h1 { max-width: 900px; font-size: clamp(38px, 5vw, 56px); font-weight: 800; letter-spacing: -.03em; }
h2 { font-size: clamp(28px, 3.2vw, 38px); font-weight: 750; }
h3 { font-size: 21px; }
.lead { max-width: 780px; color: #cad5e2; font-size: 19px; line-height: 1.8; }
.button-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 20px;
  border: 1px solid var(--geo-gold);
  background: var(--geo-gold);
  color: #07111f;
  font-weight: 750;
  text-decoration: none;
}
.button.secondary { background: transparent; color: var(--geo-gold); }

.section { padding: 78px 0; }
.section.alt { background: #0a1626; border-block: 1px solid var(--geo-line); }
.section-head { display: flex; justify-content: space-between; gap: 30px; align-items: end; margin-bottom: 32px; }
.section-intro { max-width: 700px; margin: 0; color: var(--geo-muted); }
.case-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.case-card {
  overflow: hidden;
  background: var(--geo-panel);
  border: 1px solid var(--geo-line);
  border-radius: 18px;
}
.case-card img { height: 230px; object-fit: cover; background: #091525; }
.case-card-body { padding: 24px; }
.case-card h3 { min-height: 50px; margin-bottom: 12px; }
.case-card p { color: var(--geo-muted); }
.card-meta { color: var(--geo-gold); font-size: 13px; font-weight: 700; letter-spacing: .05em; }
.text-link { color: var(--geo-gold); font-weight: 700; text-decoration: none; }

.breadcrumb { padding: 28px 0 18px; color: var(--geo-muted); font-size: 14px; }
.breadcrumb a { color: var(--geo-muted); text-decoration: none; }
.case-hero {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 42px;
  padding: 46px;
  border: 1px solid var(--geo-line);
  border-radius: 24px;
  background: linear-gradient(145deg, rgba(18,36,59,.78), rgba(7,17,31,.55));
}
.case-hero-copy { align-self: center; }
.case-hero-media { min-height: 410px; overflow: hidden; border-radius: 14px; background: #081523; }
.case-hero-media img { height: 100%; object-fit: cover; }
.case-location { color: var(--geo-gold); font-weight: 700; }

.fact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: 34px; background: var(--geo-line); border: 1px solid var(--geo-line); }
.fact { min-height: 128px; padding: 24px; background: var(--geo-panel); }
.fact strong { display: block; color: var(--geo-gold); font-size: 25px; line-height: 1.25; }
.fact span { display: block; margin-top: 9px; color: var(--geo-muted); font-size: 14px; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.panel { padding: 28px; background: var(--geo-panel); border: 1px solid var(--geo-line); border-radius: 14px; }
.panel p { color: #cad5e2; }
.clean-list { margin: 0; padding-left: 20px; }
.clean-list li { margin: 10px 0; color: #cad5e2; }
.formula { margin-top: 22px; padding: 20px; border-left: 3px solid var(--geo-gold); background: var(--geo-panel-soft); color: var(--geo-gold); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

.media-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.media-item { margin: 0; overflow: hidden; background: var(--geo-panel); border: 1px solid var(--geo-line); border-radius: 14px; }
.media-item img, .media-item video { height: 390px; object-fit: cover; background: #050c15; }
.media-item img.contain { object-fit: contain; padding: 12px; }
.media-item figcaption { padding: 18px 20px 22px; color: var(--geo-muted); }
.media-item figcaption strong { display: block; margin-bottom: 5px; color: var(--geo-text); }
.boundary { padding: 30px; border: 1px solid rgba(232,201,122,.32); background: rgba(232,201,122,.055); }
.byline { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; margin-top: 24px; background: var(--geo-line); border: 1px solid var(--geo-line); }
.byline div { padding: 17px 20px; background: var(--geo-panel); }
.byline span { display: block; color: var(--geo-muted); font-size: 13px; }

.site-footer { padding: 38px 0; background: #050d17; border-top: 1px solid var(--geo-line); color: var(--geo-muted); font-size: 14px; }
.footer-inner { display: flex; justify-content: space-between; gap: 30px; }
.footer-inner p { margin: 0; }

@media (max-width: 920px) {
  .main-nav { display: none; }
  .case-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .case-hero, .two-col { grid-template-columns: 1fr; }
  .case-hero-media { min-height: 330px; }
  .fact-grid { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 620px) {
  .header-inner, .container { width: min(calc(100% - 28px), var(--geo-max)); }
  .brand-cn { font-size: 14px; }
  .brand-en { display: none; }
  .preview-badge { display: none; }
  .hero { min-height: 560px; }
  .hero-content { padding: 70px 0 80px; }
  .section { padding: 58px 0; }
  .section-head { display: block; }
  .case-grid, .media-grid, .fact-grid, .byline { grid-template-columns: 1fr; }
  .case-hero { padding: 25px; gap: 25px; }
  .case-hero-media { min-height: 250px; }
  .media-item img, .media-item video { height: 280px; }
  .footer-inner { display: block; }
}