/* ==========================================================
   泛亚品牌站 · 共享样式 /assets/site.css
   档案室隐喻：抽屉、索引卡、标签条、编号刻度
   ========================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, figure, blockquote, dl, dd { margin: 0; }

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

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

button, input, select, textarea { font: inherit; color: inherit; }

button { background: none; border: 0; cursor: pointer; }

a { color: inherit; }

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

hr { border: 0; border-top: 1px solid var(--ink-index); margin: 0; }

/* ---------- 2. Tokens ---------- */
:root {
  --ink-deep: #0B2A4A;
  --ink-night: #06182C;
  --ink-archive: #123C63;
  --ink-index: #1F5480;
  --mist: #A9C4D9;
  --warm: #F7F4EF;
  --sand: #D9D2C5;
  --amber: #E6A817;
  --celadon: #3A9B8C;
  --black: #1A1A1A;

  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Source Han Mono SC", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell: 1280px;
  --pad: 64px;
  --gap: 24px;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(6, 24, 44, .45);
  --ease: cubic-bezier(.2, .7, .3, 1);
  --step: .2s;
  --hair: 1px solid var(--ink-index);
  --hair-soft: 1px solid rgba(31, 84, 128, .55);
}

/* ---------- 3. Base ---------- */
body {
  background: var(--ink-deep);
  color: var(--warm);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: .01em;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 900;
  letter-spacing: -.01em;
  line-height: 1.24;
}

h1 { font-size: 56px; }
h2 { font-size: 40px; }
h3 { font-size: 28px; }
h4 { font-size: 22px; }

::selection { background: var(--amber); color: var(--ink-night); }

/* 焦点样式：亮底青瓷绿，暗底琥珀金 */
:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--celadon);
  outline-offset: 2px;
  border-radius: 4px;
}

.site-header :where(a, button):focus-visible,
.site-footer :where(a, button):focus-visible,
.section--panel :where(a, button):focus-visible,
.section--deep :where(a, button):focus-visible {
  outline-color: var(--amber);
}

/* ---------- 4. 骨架 ---------- */
main { display: block; }

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.section { padding-block: 96px; }
.section--wide { padding-block: 96px; }
.section--tight { padding-block: 64px; }
.section--flush { padding-block: 40px; }
.section--light { background: var(--warm); color: var(--black); }
.section--panel { background: var(--ink-archive); color: var(--warm); }
.section--deep { background: var(--ink-night); color: var(--warm); }

.section--light .section__desc { color: rgba(26, 26, 26, .72); }
.section--light .card__note,
.section--light .media-caption { color: rgba(26, 26, 26, .72); }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 32px;
  padding-bottom: 18px;
  margin-bottom: 40px;
  border-bottom: var(--hair);
}

.section__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--amber);
}

.section__title {
  margin: 0;
  font-size: 40px;
  color: inherit;
}

.section__desc {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 5. 站点头部 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -72px;
  z-index: 200;
  padding: 10px 20px;
  background: var(--amber);
  color: var(--ink-night);
  font-size: 14px;
  letter-spacing: .06em;
  text-decoration: none;
  border-radius: 0 0 8px 8px;
  transition: top var(--step) var(--ease);
}

.skip-link:focus { top: 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink-deep);
  border-bottom: var(--hair);
}

.header-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: var(--celadon);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
  transition: transform .12s linear;
}

.header-strip {
  background: var(--ink-night);
  border-bottom: var(--hair-soft);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
  max-height: 48px;
  overflow: hidden;
  transition: max-height var(--step) var(--ease), opacity var(--step) var(--ease);
}

.header-strip__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 34px;
}

.header-strip__icp { font-family: var(--font-mono); }

.header-strip__phone {
  font-family: var(--font-mono);
  color: var(--mist);
  text-decoration: none;
  transition: color var(--step) var(--ease);
}

.header-strip__phone:hover { color: var(--amber); }

.header-masthead {
  max-height: 260px;
  overflow: hidden;
  transition: max-height var(--step) var(--ease), opacity var(--step) var(--ease);
}

.header-masthead__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: var(--gap);
  padding-block: 28px 20px;
}

.masthead-index {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 0;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  line-height: 1;
}

.masthead-index__cn { color: var(--mist); opacity: .85; }
.masthead-index__code { color: var(--amber); opacity: .85; }

.masthead-brand {
  grid-column: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  color: var(--warm);
  text-align: center;
}

.masthead-brand__name {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 40px;
  line-height: 1.2;
  letter-spacing: .14em;
  text-indent: .14em;
  transition: color var(--step) var(--ease);
}

.masthead-brand__tag {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .42em;
  text-indent: .42em;
  color: var(--amber);
}

.masthead-brand:hover .masthead-brand__name { color: var(--amber); }

.masthead-actions {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 12px;
}

.masthead-actions__link {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  border: var(--hair);
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: .12em;
  text-decoration: none;
  color: var(--warm);
  transition: border-color var(--step) var(--ease), color var(--step) var(--ease), background var(--step) var(--ease);
}

.masthead-actions__link:hover {
  border-color: var(--celadon);
  color: var(--celadon);
  background: rgba(58, 155, 140, .1);
}

/* 导航条 */
.site-nav {
  border-top: var(--hair);
  background: var(--ink-deep);
}

.site-nav__inner {
  display: flex;
  align-items: stretch;
}

.site-nav__list {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  width: 100%;
}

.site-nav__item { border-left: var(--hair-soft); }
.site-nav__item:first-child { border-left: 0; }

.site-nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
  padding: 14px 8px;
  font-size: 15px;
  letter-spacing: .08em;
  text-decoration: none;
  color: var(--mist);
  transition: color var(--step) var(--ease), background var(--step) var(--ease);
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: rgba(169, 196, 217, .6);
  transition: color var(--step) var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 16%;
  right: 16%;
  bottom: 0;
  height: 2px;
  background: transparent;
  transition: background var(--step) var(--ease);
}

.site-nav__link:hover {
  color: var(--warm);
  background: rgba(31, 84, 128, .38);
}

.site-nav__link:hover::after { background: var(--celadon); }

.site-nav__link[aria-current="page"] { color: var(--warm); }
.site-nav__link[aria-current="page"]::after { background: var(--amber); }
.site-nav__link[aria-current="page"] .site-nav__num { color: var(--amber); }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 14px 0;
  font-size: 14px;
  letter-spacing: .14em;
  color: var(--warm);
}

.nav-toggle__mark {
  position: relative;
  width: 22px;
  height: 12px;
  border-top: 2px solid var(--celadon);
  border-bottom: 2px solid var(--celadon);
  transition: transform var(--step) var(--ease);
}

.nav-toggle__text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mist);
}

[data-nav-toggle][aria-expanded="true"] .nav-toggle__mark { transform: scaleY(.45); }
[data-nav-toggle][aria-expanded="true"] .nav-toggle__text { color: var(--amber); }

/* 收窄态：只留单行索引条 */
.site-header[data-condensed] .header-strip { max-height: 0; opacity: 0; }
.site-header[data-condensed] .header-masthead { max-height: 0; opacity: 0; }

/* ---------- 6. 站点页脚 ---------- */
.site-footer {
  background: var(--ink-night);
  color: var(--mist);
  border-top: var(--hair);
  padding-top: 72px;
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(280px, 1.6fr) repeat(3, minmax(120px, 1fr));
  gap: 48px var(--gap);
}

.footer-brand__name {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 28px;
  letter-spacing: .12em;
  color: var(--warm);
}

.footer-brand__tag {
  margin: 10px 0 26px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--amber);
}

.footer-contact { display: grid; gap: 10px; }

.footer-contact__line {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 10px;
  font-size: 13px;
  line-height: 1.7;
}

.footer-contact__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  padding-top: 3px;
  color: rgba(169, 196, 217, .7);
}

.footer-contact__val { color: var(--warm); word-break: break-word; }

.footer-col__title {
  padding-bottom: 10px;
  margin-bottom: 16px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: .16em;
  color: var(--warm);
  border-bottom: var(--hair-soft);
}

.footer-col__list { display: grid; gap: 10px; }

.footer-col__list a {
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--step) var(--ease);
}

.footer-col__list a:hover { color: var(--celadon); }

.footer-ruler {
  height: 14px;
  margin-top: 56px;
  border-top: var(--hair-soft);
  background-image: repeating-linear-gradient(to right, rgba(169, 196, 217, .45) 0 1px, transparent 1px 24px);
  background-size: 100% 6px;
  background-repeat: no-repeat;
  background-position: 0 0;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  padding-block: 20px 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(169, 196, 217, .78);
}

.footer-legal__icp { margin: 0; }
.footer-legal__code { margin: 0; color: rgba(230, 168, 23, .75); }

/* ---------- 7. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 15px;
  letter-spacing: .06em;
  text-decoration: none;
  transition: background var(--step) var(--ease), color var(--step) var(--ease), border-color var(--step) var(--ease);
}

.btn--primary { background: var(--celadon); color: var(--ink-night); }
.btn--primary:hover { background: #2F8577; color: var(--warm); }

.btn--outline { border-color: var(--celadon); color: var(--celadon); }
.btn--outline:hover { background: rgba(58, 155, 140, .14); }

.btn--amber { border-color: var(--amber); color: var(--amber); }
.btn--amber:hover { background: rgba(230, 168, 23, .14); }

.btn--quiet { border-color: var(--ink-index); color: var(--mist); }
.btn--quiet:hover { border-color: var(--celadon); color: var(--warm); }

.section--light .btn--outline,
.section--light .btn--primary { color: var(--ink-night); }
.section--light .btn--primary { color: var(--warm); }

/* 面包屑 */
.crumbs { font-size: 13px; }

.crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.crumbs__item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  letter-spacing: .06em;
  color: var(--mist);
}

.crumbs__item + .crumbs__item::before {
  content: "/";
  color: var(--ink-index);
}

.crumbs__link { color: var(--mist); text-decoration: none; }
.crumbs__link:hover { color: var(--celadon); }
.crumbs__current { color: var(--warm); }

/* 正文 */
.prose {
  max-width: 38em;
  color: inherit;
}

.prose p { margin-bottom: 1.2em; }
.prose p:last-child { margin-bottom: 0; }
.prose h2 { margin: 1.6em 0 .6em; font-size: 28px; }
.prose h3 { margin: 1.4em 0 .5em; font-size: 22px; }
.prose strong { color: var(--amber); }
.prose ul, .prose ol { padding-left: 1.4em; margin-bottom: 1.2em; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: .4em; }

/* 网格 */
.grid { display: grid; gap: var(--gap); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

/* 抽屉分栏 */
.drawer {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: var(--gap);
  align-items: start;
}

.drawer__rail {
  padding-right: var(--gap);
  border-right: var(--hair);
}

.drawer__panel { min-width: 0; }

/* 数据卡 */
.card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 28px;
  background: var(--ink-archive);
  border: var(--hair-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card--light {
  background: var(--warm);
  border-color: var(--sand);
  color: var(--black);
  box-shadow: 0 10px 30px rgba(6, 24, 44, .12);
}

.card__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--mist);
}

.card--light .card__label { color: rgba(26, 26, 26, .6); }

.card__title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 22px;
  color: var(--warm);
}

.card--light .card__title { color: var(--black); }

.card__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 44px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--amber);
}

.card__unit {
  margin-left: 6px;
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--mist);
}

.card--light .card__unit { color: rgba(26, 26, 26, .6); }

.card__note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border: var(--hair);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.tag--amber { border-color: var(--amber); color: var(--amber); }
.tag--celadon { border-color: var(--celadon); color: var(--celadon); }

/* 展览注释 */
.annot {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--amber);
}

.annot--vertical { writing-mode: vertical-rl; }

.annot--tilt {
  display: inline-block;
  transform: rotate(-6deg);
  transform-origin: left bottom;
}

/* ---------- 8. 图文容器 ---------- */
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--gap);
}

.media-figure {
  display: grid;
  gap: 12px;
  margin: 0;
}

.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius);
  background: var(--ink-archive);
  box-shadow: var(--shadow);
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

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

.media-frame__plate {
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(90deg, rgba(169, 196, 217, .1) 0 1px, transparent 1px 22px),
    linear-gradient(135deg, rgba(18, 60, 99, .95), rgba(6, 24, 44, .95) 62%);
}

.media-caption {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 9. 主题筛选 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 16px 0 24px;
  margin-bottom: 36px;
  border-bottom: var(--hair);
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border: var(--hair);
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--mist);
  transition: color var(--step) var(--ease), border-color var(--step) var(--ease), background var(--step) var(--ease);
}

.filter-chip:hover {
  color: var(--warm);
  border-color: var(--celadon);
}

.filter-chip[aria-pressed="true"] {
  color: var(--warm);
  border-color: var(--celadon);
  background: rgba(58, 155, 140, .16);
}

.filter-chip__count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber);
}

.is-hidden { display: none !important; }

/* ---------- 10. 显现 ---------- */
.is-js .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .24s var(--ease), transform .24s var(--ease);
}

.is-js .reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1024px) {
  :root { --pad: 32px; }

  h1 { font-size: 44px; }
  h2, .section__title { font-size: 32px; }

  .masthead-index { display: none; }

  .header-masthead__inner { grid-template-columns: 1fr auto; }

  .masthead-brand {
    grid-column: 1;
    align-items: flex-start;
    text-align: left;
  }

  .masthead-brand__name { font-size: 32px; }

  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .span-3, .span-4, .span-5 { grid-column: span 6; }
  .span-7, .span-8 { grid-column: span 12; }

  .drawer { grid-template-columns: 200px minmax(0, 1fr); }

  .footer-main { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .site-nav__inner { flex-direction: column; align-items: stretch; }
  .nav-toggle { display: flex; }

  .site-nav__list {
    display: none;
    grid-template-columns: 1fr;
    border-top: var(--hair-soft);
  }

  .site-nav[data-open] .site-nav__list { display: grid; }

  .site-nav__item {
    border-left: 0;
    border-bottom: var(--hair-soft);
  }

  .site-nav__link {
    justify-content: flex-start;
    gap: 12px;
    padding: 14px 4px;
  }

  .site-nav__link::after {
    left: 0;
    right: auto;
    width: 0;
    bottom: -1px;
    transition: width var(--step) var(--ease), background var(--step) var(--ease);
  }

  .site-nav__link:hover::after,
  .site-nav__link[aria-current="page"]::after { width: 48px; }

  .drawer { grid-template-columns: 1fr; }

  .drawer__rail {
    padding-right: 0;
    padding-bottom: 20px;
    border-right: 0;
    border-bottom: var(--hair);
  }
}

@media (max-width: 640px) {
  :root { --pad: 20px; }

  body { font-size: 16px; line-height: 1.8; }

  h1 { font-size: 34px; }
  h2, .section__title { font-size: 26px; }
  h3 { font-size: 22px; }

  .section { padding-block: 64px; }
  .section--wide { padding-block: 64px; }
  .section--tight { padding-block: 40px; }

  .header-masthead__inner {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 14px;
    padding-block: 20px 16px;
  }

  .masthead-brand { align-items: center; text-align: center; }
  .masthead-brand__name { font-size: 26px; letter-spacing: .16em; text-indent: .16em; }
  .masthead-brand__tag { letter-spacing: .28em; text-indent: .28em; }
  .masthead-actions { justify-self: center; }

  .grid--3, .grid--4, .grid--auto { grid-template-columns: 1fr; }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8, .span-12 { grid-column: 1 / -1; }

  .card { padding: 22px; }
  .card__value { font-size: 36px; }

  .footer-main { grid-template-columns: 1fr; gap: 32px; }

  .footer-contact__line { grid-template-columns: 1fr; gap: 2px; }

  .footer-ruler { margin-top: 40px; }
}

/* ---------- 12. 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  .header-progress { transition: none; }

  .is-js .reveal,
  .is-js .reveal.is-in {
    opacity: 1;
    transform: none;
  }
}