/* ==========================================================================
   环球中心 · Site Kit 共享样式 (/assets/site.css)
   骨架：左侧轨道 + 非对称主栏 + 雾银分区 + 极细边界
   ========================================================================== */

:root {
  --silver: #E7EAED;
  --silver-deep: #DCE1E6;
  --ink: #1B2228;
  --ink-soft: #46525C;
  --ink-mute: #6C7883;
  --blue: #0B5FD0;
  --blue-deep: #0A4EB0;
  --blue-light: #3F8DFF;
  --gold: #C3924A;
  --gold-soft: #F4E8D6;
  --gold-ink: #7A5620;
  --paper: #F8FAFB;
  --teal: #008C8C;
  --coral: #C94F3D;
  --line: #B8C0C8;
  --line-soft: #D3D9DE;
  --rail-w: 236px;
  --header-h: 64px;
  --pad: clamp(18px, 4vw, 56px);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --font-display: "Noto Sans SC", "Source Han Sans SC", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --shadow-island: 0 18px 40px -28px rgba(27, 34, 40, 0.45), 0 2px 6px -2px rgba(27, 34, 40, 0.12);
}

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--silver);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.14;
  text-wrap: balance;
}

p { margin: 0; }

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
}

img, svg, picture, video {
  display: block;
  max-width: 100%;
}

table {
  border-collapse: collapse;
  width: 100%;
}

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 12px;
  z-index: 200;
  transform: translateY(-180%);
  padding: 10px 16px;
  background: var(--ink);
  color: #FFFFFF;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  transition: transform 0.18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

/* ==========================================================================
   头部 · 侧边轨道
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 60;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 22px;
  padding: 26px 18px 22px;
  background: var(--paper);
  border-right: 1px solid var(--line-soft);
  overflow: visible;
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
}

/* 品牌 */
.rail-brand { display: block; }

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
}

.brand-mark {
  display: grid;
  place-items: center;
  flex: 0 0 40px;
  width: 40px;
  height: 40px;
  background: var(--silver);
  border: 1px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.2;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.brand-desc {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
  white-space: nowrap;
}

/* 轨道导航 */
.rail-nav {
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-item { position: relative; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 8px 10px 8px 12px;
  border-left: 2px solid transparent;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.nav-index {
  flex: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--line);
  transition: color 0.18s var(--ease);
}

.nav-label { line-height: 1.3; }

.nav-link:hover {
  color: var(--ink);
  background: rgba(11, 95, 208, 0.06);
  border-left-color: var(--line);
}

.nav-link:hover .nav-index { color: var(--blue); }

.nav-link[aria-current="page"] {
  color: var(--blue);
  font-weight: 700;
  background: rgba(11, 95, 208, 0.08);
  border-left-color: var(--blue);
}

.nav-link[aria-current="page"] .nav-index { color: var(--blue); }

/* 轨道底部操作区 */
.rail-foot {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

.rail-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
}

.rail-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 44px;
  padding: 10px 12px;
  background: var(--blue);
  color: #FFFFFF;
  border: 1px solid var(--blue);
  border-radius: 2px;
  font-size: 14px;
  font-weight: 700;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.rail-cta::after {
  content: "\2192";
  font-family: var(--font-mono);
  font-size: 13px;
}

.rail-cta:hover { background: var(--blue-deep); border-color: var(--blue-deep); }

.rail-cta--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-soft);
}

.rail-cta--ghost:hover {
  background: var(--gold-soft);
  border-color: var(--gold);
  color: var(--gold-ink);
}

/* 滚动刻度 */
.rail-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.12s linear;
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--ink);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.is-open .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle.is-open .nav-toggle-bar:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background: var(--ink);
  color: #DDE2E6;
  padding: clamp(40px, 6vw, 72px) var(--pad) 26px;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.35fr);
  gap: clamp(24px, 4vw, 48px);
  max-width: 1240px;
  margin: 0 auto;
}

.footer-brand { min-width: 0; }

.footer-brand-name {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: 0.06em;
  color: #FFFFFF;
}

.footer-brand-name::before {
  content: "";
  display: block;
  width: 10px;
  height: 10px;
  background: var(--gold);
}

.footer-intro {
  margin-top: 12px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: #AEB8C0;
}

.footer-stamp {
  display: inline-block;
  margin-top: 16px;
  padding: 4px 9px;
  border: 1px solid rgba(195, 146, 74, 0.5);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.footer-col { min-width: 0; }

.footer-col-title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #8C99A3;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-size: 14px;
  color: #DDE2E6;
  transition: color 0.16s var(--ease);
}

.footer-link:hover {
  color: #FFFFFF;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--gold);
}

.footer-contact { min-width: 0; }

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: #8C99A3;
}

.contact-value {
  font-size: 14px;
  line-height: 1.6;
  color: #E7EAED;
  word-break: break-word;
}

.contact-note {
  margin-top: 14px;
  font-size: 12px;
  line-height: 1.7;
  color: #94A1AB;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  max-width: 1240px;
  margin: clamp(32px, 5vw, 56px) auto 0;
  padding-top: 18px;
  border-top: 1px solid rgba(184, 192, 200, 0.22);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: #8C99A3;
}

.footer-copy { margin: 0; }
.footer-icp { margin: 0; }

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-legal-links a { color: #B6C0C8; }

.footer-legal-links a:hover {
  color: #FFFFFF;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ==========================================================================
   通用版式
   ========================================================================== */
.container {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: var(--pad);
}

.page-shell {
  padding-block: clamp(24px, 4vw, 48px);
}

.section { margin-top: clamp(40px, 6vw, 80px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 22px;
}

.eyebrow {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blue);
}

.display-title {
  font-size: clamp(2.4rem, 5vw, 5.2rem);
  line-height: 1.04;
}

.section-title {
  font-size: clamp(1.6rem, 2.6vw, 2.4rem);
}

.lede {
  max-width: 62ch;
  font-size: clamp(1rem, 1.2vw, 1.125rem);
  line-height: 1.8;
  color: var(--ink-soft);
}

.mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.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;
}

/* 栅格 */
.grid {
  display: grid;
  gap: clamp(16px, 2vw, 24px);
}

.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.grid--split {
  grid-template-columns: minmax(0, 8fr) minmax(0, 3fr);
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

/* 操作岛 */
.island {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  box-shadow: var(--shadow-island);
}

/* 卡片 */
.card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(16px, 2vw, 22px);
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.card:hover {
  border-color: var(--blue-light);
  transform: translateY(-2px);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.btn--primary {
  background: var(--blue);
  border-color: var(--blue);
  color: #FFFFFF;
}

.btn--primary:hover {
  background: var(--blue-deep);
  border-color: var(--blue-deep);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.btn--ghost:hover {
  border-color: var(--blue);
  color: var(--blue);
  background: rgba(11, 95, 208, 0.06);
}

.btn--gold {
  background: var(--gold-soft);
  border-color: var(--gold);
  color: var(--gold-ink);
}

.btn--gold:hover {
  background: var(--gold);
  color: #FFFFFF;
}

/* 标签与展签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.tag--gold {
  background: var(--gold-soft);
  border-color: var(--gold);
  color: var(--gold-ink);
}

.tag--blue {
  background: rgba(11, 95, 208, 0.08);
  border-color: var(--blue);
  color: var(--blue);
}

.tag--teal {
  background: rgba(0, 140, 140, 0.08);
  border-color: var(--teal);
  color: var(--teal);
}

.exhibit-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.exhibit-label::before {
  content: "";
  display: block;
  width: 16px;
  height: 1px;
  background: var(--gold);
}

/* 面包屑 */
.breadcrumbs { margin-bottom: clamp(18px, 3vw, 28px); }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
}

.breadcrumb-list li { display: inline-flex; align-items: center; }

.breadcrumb-list li + li::before {
  content: "/";
  margin: 0 8px;
  color: var(--line);
}

.breadcrumb-list a { color: var(--ink-mute); }
.breadcrumb-list a:hover { color: var(--blue); }
.breadcrumb-list [aria-current="page"] { color: var(--ink); font-weight: 700; }

/* 图片容器基础 */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--silver-deep);
  border: 1px solid var(--line-soft);
  border-radius: 2px;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(248, 250, 251, 0.35);
  pointer-events: none;
}

.media-frame > img,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  background: rgba(27, 34, 40, 0.72);
  color: #F2F5F7;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
}

/* 数据条 */
.data-bar {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.data-bar__meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.data-bar__track {
  height: 6px;
  background: var(--silver-deep);
  border-radius: 1px;
  overflow: hidden;
}

.data-bar__fill {
  display: block;
  height: 100%;
  background: var(--blue);
}

.data-bar__fill--gold { background: var(--gold); }

/* 时间线 */
.timeline {
  position: relative;
  margin-left: 6px;
  border-left: 1px solid var(--line-soft);
}

.timeline-item {
  position: relative;
  padding: 0 0 26px 26px;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: "";
  position: absolute;
  top: 6px;
  left: -4.5px;
  width: 8px;
  height: 8px;
  background: var(--paper);
  border: 1.5px solid var(--blue);
  border-radius: 50%;
}

/* 筛选栏 */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}

.filter-btn {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  cursor: pointer;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.filter-btn:hover {
  border-color: var(--blue-light);
  color: var(--blue);
}

.filter-btn[aria-pressed="true"] {
  background: var(--blue);
  border-color: var(--blue);
  color: #FFFFFF;
}

.filter-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
}

[data-filter-item][hidden] { display: none !important; }

/* 显现 */
html.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.28s var(--ease), transform 0.28s var(--ease);
}

html.reveal-ready [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1023px) {
  body { padding-left: 0; }

  .site-header {
    position: sticky;
    top: 0;
    bottom: auto;
    left: auto;
    width: auto;
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: var(--header-h);
    padding: 10px var(--pad);
    background: rgba(248, 250, 251, 0.97);
    border-right: 0;
    border-bottom: 1px solid var(--line-soft);
  }

  .rail-brand {
    flex: 1 1 auto;
    min-width: 0;
  }

  .brand { gap: 10px; }

  .brand-mark {
    flex: 0 0 34px;
    width: 34px;
    height: 34px;
    font-size: 12px;
  }

  .brand-name { font-size: 17px; letter-spacing: 0.04em; }

  .brand-desc { display: none; }

  .rail-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    z-index: 59;
    display: none;
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    padding: 10px var(--pad) 22px;
    background: var(--paper);
    border-bottom: 1px solid var(--line-soft);
    box-shadow: 0 28px 48px -32px rgba(27, 34, 40, 0.5);
  }

  .rail-nav[data-open] { display: block; }

  .nav-list { gap: 0; }

  .nav-link {
    min-height: 52px;
    padding: 12px 6px;
    border-left: 0;
    border-bottom: 1px solid var(--line-soft);
  }

  .nav-link:hover { border-left-color: transparent; }

  .nav-link[aria-current="page"] {
    border-left: 0;
    background: rgba(11, 95, 208, 0.07);
  }

  .nav-index { flex-basis: 22px; font-size: 12px; }

  .rail-foot { display: none; }

  .nav-toggle { display: inline-flex; }

  .filter-count { margin-left: 0; width: 100%; }
}

@media (max-width: 960px) {
  .footer-inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-brand { grid-column: 1 / -1; }
  .grid--split { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 720px) {
  body { font-size: 16px; }

  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

  .medline { display: none; }
}

@media (max-width: 560px) {
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-base { flex-direction: column; align-items: flex-start; gap: 10px; }
  .grid--12 { grid-template-columns: minmax(0, 1fr); }
  .display-title { font-size: clamp(2rem, 9vw, 2.8rem); }
  .btn { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html.reveal-ready [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .rail-progress { transition: none; }
  .card:hover { transform: none; }
}