:root {
  --blue-900: #073f72;
  --blue-800: #07558f;
  --blue-700: #0869b2;
  --blue-600: #1384cf;
  --blue-100: #eaf5fd;
  --blue-050: #f4f9fd;
  --ink: #152331;
  --muted: #667687;
  --line: #dce7ef;
  --surface: #ffffff;
  --page: #eef3f7;
  --shadow: 0 18px 55px rgba(16, 55, 86, .11);
  --radius: 14px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0;
  color: var(--ink);
  background: linear-gradient(180deg, #e9f2f8 0, var(--page) 400px, #f5f7f9 100%);
  font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
body.lightbox-open { overflow: hidden; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
img { display: block; max-width: 100%; }

.skip-link {
  position: fixed;
  left: 16px;
  top: -60px;
  z-index: 1000;
  padding: 8px 14px;
  color: #fff;
  background: var(--blue-900);
  border-radius: 8px;
}
.skip-link:focus { top: 12px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(255,255,255,.25);
  background: rgba(6, 76, 128, .95);
  box-shadow: 0 4px 20px rgba(0, 46, 85, .16);
  backdrop-filter: blur(12px);
}
.header-inner {
  width: min(1120px, calc(100% - 36px));
  min-height: 64px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}
.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid rgba(255,255,255,.6);
  border-radius: 9px;
  background: rgba(255,255,255,.12);
  font-size: 18px;
  font-family: serif;
}
.site-nav { display: flex; align-items: center; gap: 2px; }
.site-nav a {
  padding: 7px 9px;
  color: rgba(255,255,255,.85);
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: .2s ease;
}
.site-nav a:hover, .site-nav a:focus-visible, .site-nav a.active { color: #fff; background: rgba(255,255,255,.14); }
.nav-toggle { display: none; }

.article-shell {
  width: min(820px, calc(100% - 32px));
  margin: 34px auto 72px;
  background: var(--surface);
  border: 1px solid rgba(207, 221, 231, .85);
  border-radius: 20px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
article { padding: 54px 64px 12px; }
section { scroll-margin-top: 84px; }
.intro-section { padding-bottom: 42px; }
.eyebrow, .section-kicker {
  margin: 0 0 8px;
  color: var(--blue-700);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}
h1 {
  position: relative;
  margin: 0 0 24px;
  padding-bottom: 22px;
  color: #102c44;
  font-family: "Songti SC", SimSun, serif;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.34;
  letter-spacing: .02em;
}
h1::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 68px;
  height: 4px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--blue-700), #52b7ea);
}
.lead { margin: 0 0 28px; color: #344555; font-size: 17px; text-align: justify; }
.summary { margin: 26px 0 16px; font-weight: 600; color: #263a4d; }

.media-frame {
  margin: 20px 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f8fafb;
}
.media-frame button { width: 100%; }
.zoomable {
  position: relative;
  display: block;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
}
.zoomable img { width: 100%; height: auto; transition: transform .35s ease, filter .35s ease; }
.zoomable:hover img { transform: scale(1.012); filter: brightness(.95); }
.zoom-hint {
  position: absolute;
  right: 12px;
  bottom: 12px;
  padding: 5px 10px;
  color: #fff;
  border-radius: 999px;
  background: rgba(10, 32, 51, .72);
  font-size: 12px;
  opacity: 0;
  transform: translateY(4px);
  transition: .2s ease;
}
.zoomable:hover .zoom-hint, .zoomable:focus-visible .zoom-hint { opacity: 1; transform: translateY(0); }
figcaption { padding: 10px 14px; color: var(--muted); border-top: 1px solid var(--line); font-size: 13px; text-align: center; }
.hero-media { border-radius: 16px; }

.location-card {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  margin: 18px 0;
  padding: 16px 18px;
  color: var(--ink);
  border: 1px solid #dbe9f3;
  border-radius: 12px;
  background: linear-gradient(135deg, #f8fbfd, #f2f8fc);
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
a.location-card:hover, a.location-card:focus-visible { transform: translateY(-2px); border-color: #93c4e6; box-shadow: 0 9px 24px rgba(8, 105, 178, .11); }
.pin {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: var(--blue-700);
  border-radius: 50%;
  background: #e3f2fc;
}
.pin svg { width: 21px; height: 21px; fill: currentColor; }
.location-copy { min-width: 0; }
.location-copy strong, .location-copy small { display: block; }
.location-copy strong { margin-bottom: 3px; font-size: 15px; line-height: 1.55; }
.location-copy small { color: var(--muted); font-size: 13px; line-height: 1.55; }
.map-action { color: var(--blue-700); font-size: 13px; font-weight: 700; white-space: nowrap; }
.map-action span { font-size: 20px; vertical-align: -1px; }
.pending { border-style: dashed; background: #f8fafb; }
.pending .pin { color: #8c9baa; background: #edf1f4; }
.status-label { padding: 3px 9px; color: #687786; border: 1px solid #d5dde4; border-radius: 999px; font-size: 12px; white-space: nowrap; }

.map-section, .project-section { padding: 48px 0 50px; border-top: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: 52px 1fr; align-items: start; gap: 16px; margin-bottom: 22px; }
.section-heading.compact { display: block; }
.section-number {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  color: #fff;
  border-radius: 13px;
  background: linear-gradient(145deg, var(--blue-700), var(--blue-900));
  box-shadow: 0 8px 18px rgba(8, 105, 178, .18);
  font-family: "Songti SC", SimSun, serif;
  font-size: 21px;
  font-weight: 700;
}
.section-heading h2 { margin: 0; color: #142d43; font-size: clamp(21px, 3vw, 28px); line-height: 1.45; }
.section-heading .section-kicker { margin-bottom: 2px; font-size: 11px; }
.distribution-map { margin-bottom: 0; }
.project-gallery { display: grid; gap: 16px; }
.project-gallery .media-frame { margin: 0; }
.project-gallery .media-frame:nth-child(2) .zoomable img { max-height: 560px; object-fit: contain; background: #eef3f6; }

.page-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 64px;
  color: rgba(255,255,255,.9);
  background: linear-gradient(110deg, var(--blue-900), var(--blue-700));
  font-size: 13px;
}
.page-footer strong { font-size: 14px; }

.back-to-top {
  position: fixed;
  right: max(20px, calc((100vw - 930px) / 2));
  bottom: 24px;
  z-index: 40;
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  color: #fff;
  border: 0;
  border-radius: 50%;
  background: var(--blue-700);
  box-shadow: 0 8px 22px rgba(8, 72, 120, .25);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: .2s ease;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }

.lightbox {
  width: min(96vw, 1200px);
  max-width: none;
  height: min(94vh, 900px);
  max-height: none;
  padding: 52px 20px 20px;
  color: #fff;
  border: 0;
  border-radius: 14px;
  background: rgba(8, 20, 31, .96);
  box-shadow: 0 30px 90px rgba(0,0,0,.45);
}
.lightbox::backdrop { background: rgba(4, 15, 24, .82); backdrop-filter: blur(5px); }
.lightbox img { width: 100%; height: calc(100% - 36px); object-fit: contain; }
.lightbox p { margin: 8px 0 0; text-align: center; font-size: 14px; }
.lightbox-close {
  position: absolute;
  top: 10px;
  right: 14px;
  width: 36px;
  height: 36px;
  color: #fff;
  border: 0;
  border-radius: 50%;
  background: rgba(255,255,255,.14);
  font-size: 27px;
  line-height: 1;
  cursor: pointer;
}

@media (max-width: 900px) {
  .header-inner { width: min(100% - 28px, 820px); }
  .nav-toggle {
    display: grid;
    width: 42px;
    height: 42px;
    padding: 10px;
    align-content: center;
    gap: 5px;
    color: #fff;
    border: 1px solid rgba(255,255,255,.28);
    border-radius: 9px;
    background: rgba(255,255,255,.08);
  }
  .nav-toggle span:not(.sr-only) { display: block; width: 100%; height: 2px; border-radius: 2px; background: currentColor; transition: .2s ease; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 64px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4px;
    max-height: 0;
    padding: 0 16px;
    overflow: hidden;
    background: rgba(5, 69, 117, .98);
    transition: max-height .28s ease, padding .28s ease;
  }
  .site-nav.open { max-height: 330px; padding: 12px 16px 16px; }
  .site-nav a { padding: 9px 12px; font-size: 14px; }
}

@media (max-width: 680px) {
  body { background: #fff; }
  .brand { font-size: 15px; }
  .article-shell { width: 100%; margin: 0; border: 0; border-radius: 0; box-shadow: none; }
  article { padding: 36px 18px 0; }
  h1 { margin-bottom: 20px; padding-bottom: 18px; font-size: 26px; }
  .lead { font-size: 16px; line-height: 1.9; }
  .media-frame { margin: 16px 0; border-radius: 8px; }
  .location-card { grid-template-columns: 38px minmax(0, 1fr); gap: 11px; padding: 13px; }
  .pin { width: 38px; height: 38px; }
  .map-action, .status-label { grid-column: 2; justify-self: start; margin-top: -5px; }
  .section-heading { grid-template-columns: 42px 1fr; gap: 12px; }
  .section-number { width: 40px; height: 40px; border-radius: 10px; font-size: 18px; }
  .section-heading h2 { font-size: 21px; }
  .map-section, .project-section { padding: 38px 0 40px; }
  .zoom-hint { display: none; }
  .page-footer { display: grid; padding: 24px 18px; }
  .back-to-top { right: 16px; bottom: 18px; }
  .lightbox { width: 100vw; height: 100vh; border-radius: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}