/* ==========================================================================
   澳门银诃中国站 — /assets/site.css
   河流档案视觉系统：银诃蓝轨道 + 奶油纸底 + 铜橙行动 + 青瓷绿数据
   ========================================================================== */

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

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

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

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

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

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

button { background: none; border: 0; padding: 0; }

a { color: inherit; }

table { border-collapse: collapse; border-spacing: 0; }

[hidden] { display: none !important; }

/* ---------- 2. Tokens ---------- */
:root {
  /* 色板 */
  --yh-blue: #1B3A6B;
  --yh-blue-deep: #12294C;
  --yh-ink: #2B2622;
  --yh-ink-soft: #57503F;
  --yh-cream: #F7F3EA;
  --yh-silver: #C8D4E3;
  --yh-mist: #F4F7FB;
  --yh-copper: #C96F2E;
  --yh-copper-deep: #A9521C;
  --yh-celadon: #3E7C6B;
  --yh-celadon-light: #E3EFEA;
  --yh-gauge: #6B7683;
  --yh-sand: #E6DCCB;
  --yh-alert: #B23A2E;

  /* 渐变 */
  --grad-river: linear-gradient(180deg, var(--yh-silver) 0%, var(--yh-mist) 100%);
  --grad-river-x: linear-gradient(90deg, var(--yh-silver) 0%, var(--yh-mist) 100%);
  --grad-rail: linear-gradient(180deg, var(--yh-blue) 0%, var(--yh-silver) 100%);

  /* 字体 */
  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  /* 圆角 */
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 12px;
  --pill: 999px;

  /* 阴影 */
  --shadow-1: 0 1px 0 rgba(43, 38, 34, .05), 0 10px 26px -20px rgba(27, 58, 107, .45);
  --shadow-2: 0 2px 0 rgba(43, 38, 34, .04), 0 22px 44px -24px rgba(27, 58, 107, .55);

  /* 尺寸 */
  --shell-max: 1400px;
  --gutter: clamp(18px, 3.2vw, 44px);
  --header-h: 76px;
  --header-h-condensed: 56px;

  /* 动效 */
  --ease: cubic-bezier(.2, .7, .3, 1);
  --dur: 240ms;
}

/* ---------- 3. 中文排版基线 ---------- */
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--yh-ink);
  background-color: var(--yh-cream);
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(27, 58, 107, .05) 0 1px,
    rgba(27, 58, 107, 0) 1px 46px
  );
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: .02em;
  color: var(--yh-blue);
}

strong, b { font-weight: 700; }

code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: .92em;
}

::selection {
  background: rgba(201, 111, 46, .24);
  color: var(--yh-ink);
}

#main-content { scroll-margin-top: calc(var(--header-h) + 18px); }

:focus-visible {
  outline: 2.5px solid var(--yh-copper);
  outline-offset: 2px;
  border-radius: 4px;
}

.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;
}

/* ---------- 4. 布局容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(36px, 6vw, 84px); }

.section-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(20px, 3vw, 38px);
  max-width: 74ch;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--yh-gauge);
}

.section-title {
  font-size: clamp(26px, 3.4vw, 38px);
  letter-spacing: .04em;
}

.lede {
  font-size: clamp(16px, 1.3vw, 18px);
  line-height: 1.8;
  color: var(--yh-ink-soft);
  max-width: 64ch;
}

.prose {
  max-width: 72ch;
  color: var(--yh-ink);
}

.prose p + p { margin-top: 1em; }

.divider {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, rgba(27, 58, 107, .28), rgba(27, 58, 107, 0));
  margin-block: clamp(24px, 3vw, 44px);
}

.grid { display: grid; gap: clamp(16px, 2vw, 28px); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 620px) {
  .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1.5px solid transparent;
  border-radius: var(--pill);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .05em;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color .18s var(--ease), color .18s var(--ease),
              border-color .18s var(--ease), transform .18s var(--ease);
}

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

.btn-copper {
  background: var(--yh-copper);
  color: #FFFFFF;
  border-color: var(--yh-copper);
}
.btn-copper:hover { background: var(--yh-copper-deep); border-color: var(--yh-copper-deep); }

.btn-outline-copper {
  background: transparent;
  color: var(--yh-copper-deep);
  border-color: var(--yh-copper);
}
.btn-outline-copper:hover {
  background: rgba(201, 111, 46, .12);
  color: var(--yh-copper-deep);
  border-color: var(--yh-copper-deep);
}

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

.btn-quiet {
  background: transparent;
  color: var(--yh-blue);
  border-color: rgba(27, 58, 107, .28);
}
.btn-quiet:hover { background: rgba(200, 212, 227, .45); border-color: var(--yh-blue); }

/* ---------- 6. 胶囊标签与数据块 ---------- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 13px;
  border: 1px solid rgba(27, 58, 107, .16);
  border-radius: var(--pill);
  background: var(--yh-sand);
  color: var(--yh-blue);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  line-height: 1.6;
  white-space: nowrap;
}

.pill-celadon {
  background: var(--yh-celadon-light);
  color: var(--yh-celadon);
  border-color: rgba(62, 124, 107, .3);
}

.pill-copper {
  background: rgba(201, 111, 46, .12);
  color: var(--yh-copper-deep);
  border-color: rgba(201, 111, 46, .38);
}

.stat {
  display: grid;
  gap: 4px;
  padding: 16px 18px;
  border-left: 3px solid var(--yh-celadon);
  border-radius: var(--radius-md);
  background: var(--yh-celadon-light);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--yh-blue);
  line-height: 1.2;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--yh-gauge);
}

.data-value {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--yh-celadon);
  border-bottom: 2px solid rgba(62, 124, 107, .35);
  padding-bottom: 1px;
}

/* ---------- 7. 卡片与横向流 ---------- */
.card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid rgba(27, 58, 107, .14);
  border-radius: var(--radius-lg);
  background: var(--yh-mist);
  box-shadow: var(--shadow-1);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); }

.card-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--yh-gauge);
}

.card-title {
  font-size: clamp(19px, 1.6vw, 22px);
  letter-spacing: .03em;
  color: var(--yh-blue);
}

.card-text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--yh-ink-soft);
}

.card-meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--yh-gauge);
}

.chip-row {
  display: flex;
  gap: clamp(12px, 1.6vw, 20px);
  overflow-x: auto;
  padding-bottom: 14px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.chip-row > * {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

/* ---------- 8. 媒体容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid rgba(27, 58, 107, .12);
  border-radius: var(--radius-lg);
  background: var(--grad-river);
}

.media-frame > img,
.media-frame > svg,
.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--band { aspect-ratio: 12 / 5; }

.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--yh-gauge);
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumb { padding-top: clamp(16px, 2vw, 28px); }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--yh-gauge);
}

.breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(27, 58, 107, .35);
}

.breadcrumb-list a { text-decoration: none; color: var(--yh-gauge); }
.breadcrumb-list a:hover { color: var(--yh-blue); }

/* ---------- 10. 数据表 ---------- */
.data-table-wrap {
  overflow-x: auto;
  border: 1px solid rgba(27, 58, 107, .18);
  border-radius: var(--radius-md);
  background: var(--yh-mist);
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  min-width: 560px;
  font-size: 14.5px;
  line-height: 1.6;
}

.data-table th {
  padding: 12px 14px;
  background: var(--yh-celadon);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  text-align: left;
  white-space: nowrap;
}

.data-table td {
  padding: 11px 14px;
  border-top: 1px solid rgba(27, 58, 107, .1);
  vertical-align: top;
  color: var(--yh-ink);
}

.data-table tbody tr:nth-child(even) { background: var(--yh-celadon-light); }

.data-table td:first-child {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--yh-celadon);
  background: var(--yh-sand);
  white-space: nowrap;
}

/* ---------- 11. 折叠块 ---------- */
.accordion { display: grid; gap: 10px; }

.accordion-item {
  border: 1px solid rgba(27, 58, 107, .16);
  border-radius: var(--radius-md);
  background: rgba(244, 247, 251, .65);
  overflow: hidden;
}

.accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  padding: 16px 20px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--yh-blue);
  text-align: left;
  cursor: pointer;
  transition: background-color .18s var(--ease);
}

.accordion-trigger:hover { background: rgba(200, 212, 227, .35); }

.accordion-trigger::after {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: -4px;
  border-right: 2px solid var(--yh-copper);
  border-bottom: 2px solid var(--yh-copper);
  transform: rotate(45deg);
  transition: transform .22s var(--ease), margin-top .22s var(--ease);
}

.accordion-trigger[aria-expanded="true"] { background: var(--yh-celadon-light); }

.accordion-trigger[aria-expanded="true"]::after {
  transform: rotate(225deg);
  margin-top: 4px;
}

.accordion-panel {
  padding: 2px 20px 20px;
  background: var(--yh-celadon-light);
  font-size: 15px;
  line-height: 1.8;
  color: var(--yh-ink-soft);
}

.accordion-panel[hidden] { display: none; }

/* ---------- 12. 筛选条 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.filter-chip {
  padding: 8px 16px;
  border: 1.5px solid rgba(27, 58, 107, .2);
  border-radius: var(--pill);
  background: var(--yh-sand);
  color: var(--yh-blue);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  cursor: pointer;
  transition: background-color .18s var(--ease), color .18s var(--ease),
              border-color .18s var(--ease);
}

.filter-chip:hover { border-color: var(--yh-blue); }

.filter-chip[aria-pressed="true"] {
  background: var(--yh-blue);
  border-color: var(--yh-blue);
  color: var(--yh-cream);
}

/* ---------- 13. 年份刻度轨道 ---------- */
.year-rail {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  align-self: start;
  display: grid;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--yh-gauge);
}

.year-mark {
  position: relative;
  padding: 14px 20px 14px 22px;
  border-left: 1.5px solid rgba(27, 58, 107, .2);
}

.year-mark::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--yh-silver);
  transform: translateY(-50%);
  transition: background-color .2s var(--ease), box-shadow .2s var(--ease);
}

.year-mark[aria-current="true"] {
  color: var(--yh-blue);
  font-weight: 600;
}

.year-mark[aria-current="true"]::before {
  background: var(--yh-copper);
  box-shadow: 0 0 0 3px rgba(201, 111, 46, .2);
}

/* ---------- 14. 显现动效 ---------- */
html[data-reveal-ready] [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

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

/* ---------- 15. 复制按钮状态 ---------- */
[data-copy] { cursor: pointer; }

[data-copy].is-copied {
  color: var(--yh-celadon);
  border-color: rgba(62, 124, 107, .45);
  background: var(--yh-celadon-light);
}

/* ==========================================================================
   16. 页眉
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, #FCFAF4 0%, #F7F3EA 100%);
  border-bottom: 1px solid rgba(27, 58, 107, .16);
  transition: box-shadow var(--dur) var(--ease);
}

.site-header.is-condensed {
  box-shadow: 0 12px 28px -24px rgba(27, 58, 107, .7);
  background: linear-gradient(180deg, #FDFBF6 0%, #F7F3EA 100%);
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -120px;
  z-index: 120;
  padding: 10px 18px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background: var(--yh-blue);
  color: var(--yh-cream);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  text-decoration: none;
  transition: top .18s var(--ease);
}

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

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 24px);
  width: 100%;
  max-width: var(--shell-max);
  min-height: var(--header-h);
  margin-inline: auto;
  padding-inline: var(--gutter);
  transition: min-height var(--dur) var(--ease);
}

.site-header.is-condensed .header-inner { min-height: var(--header-h-condensed); }

/* 品牌轨道 */
.brand-rail {
  position: relative;
  flex: 0 0 auto;
  padding-left: 20px;
  padding-block: 10px;
}

.brand-rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 34px;
  border-radius: 2px;
  background: var(--grad-rail);
  transform: translateY(-50%);
  box-shadow:
    6px 0 0 -1px rgba(27, 58, 107, .22),
    12px 0 0 -1px rgba(27, 58, 107, .1);
  transition: height var(--dur) var(--ease);
}

.site-header.is-condensed .brand-rail::before { height: 26px; }

.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  text-decoration: none;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: .08em;
  color: var(--yh-blue);
  transition: font-size var(--dur) var(--ease);
}

.brand-sub {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--yh-gauge);
  transition: font-size var(--dur) var(--ease);
}

.site-header.is-condensed .brand-sub { font-size: 9.5px; }

/* 导航 */
.site-nav { margin-left: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(4px, 1.4vw, 22px);
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 8px 2px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--yh-blue);
  text-decoration: none;
  white-space: nowrap;
  border-radius: 4px;
  transition: color .18s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--yh-copper);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .22s var(--ease);
}

.nav-link:hover { color: var(--yh-blue-deep); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] {
  color: var(--yh-blue-deep);
  font-weight: 800;
}
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

/* 页眉行动区 */
.header-utility { flex: 0 0 auto; }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  order: 2;
  margin-left: auto;
  padding: 9px 16px 9px 14px;
  border: 1.5px solid rgba(27, 58, 107, .32);
  border-radius: var(--pill);
  color: var(--yh-blue);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  cursor: pointer;
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}

.nav-toggle:hover {
  border-color: var(--yh-blue);
  background: rgba(200, 212, 227, .35);
}

.nav-toggle-bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle-bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--yh-blue);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}

.site-header[data-open] .nav-toggle-bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle-bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 水位进度 */
.header-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--yh-blue) 0%, var(--yh-celadon) 62%, var(--yh-copper) 100%);
  transition: transform .1s linear;
  pointer-events: none;
}

/* 页眉响应式 */
@media (max-width: 1180px) {
  .nav-link { font-size: 14px; }
  .nav-list { gap: clamp(4px, 1vw, 12px); }
}

@media (max-width: 900px) {
  .header-inner {
    flex-wrap: wrap;
    align-content: center;
    padding-block: 12px;
    min-height: 64px;
    row-gap: 0;
  }

  .site-header.is-condensed .header-inner { min-height: 58px; }

  .brand-rail { order: 1; padding-left: 18px; }
  .brand-name { font-size: 17px; }
  .brand-sub { font-size: 9.5px; }

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

  .site-nav {
    order: 3;
    flex-basis: 100%;
    margin-left: 0;
    display: none;
    padding-top: 12px;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 7px;
    padding-bottom: 10px;
  }

  .nav-link {
    display: block;
    padding: 11px 16px;
    border: 1px solid rgba(27, 58, 107, .12);
    border-radius: var(--pill);
    background: rgba(200, 212, 227, .32);
  }

  .nav-link::after { display: none; }

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

  .header-utility {
    order: 4;
    flex-basis: 100%;
    display: none;
    padding-bottom: 14px;
  }

  .site-header[data-open] .header-utility { display: block; }

  .header-utility .btn { width: 100%; }
}

/* ==========================================================================
   17. 页脚
   ========================================================================== */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 110px);
  border-top: 3px solid var(--yh-blue);
  background: linear-gradient(180deg, #EDE7DA 0%, #F7F3EA 72%);
  color: var(--yh-ink);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.25fr .9fr .9fr 1.5fr;
  gap: clamp(22px, 3vw, 52px);
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(32px, 4.5vw, 64px) var(--gutter) clamp(24px, 3vw, 40px);
}

.footer-rail {
  position: relative;
  padding-left: 20px;
}

.footer-rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  border-radius: 3px;
  background: var(--grad-rail);
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: .08em;
  color: var(--yh-blue);
}

.footer-brand-sub {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--yh-gauge);
}

.footer-rail-meta {
  margin-top: 14px;
  max-width: 26ch;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--yh-ink-soft);
}

.footer-col-title {
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(27, 58, 107, .16);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--yh-blue);
}

.footer-list { display: grid; gap: 9px; }

.footer-link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--yh-ink-soft);
  text-decoration: none;
  transition: color .18s var(--ease), padding-left .18s var(--ease);
}

.footer-link:hover { color: var(--yh-copper-deep); padding-left: 5px; }

.footer-contact { display: grid; gap: 12px; }

.footer-contact p {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--yh-ink);
}

.footer-contact-label {
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--yh-gauge);
}

.footer-contact-note {
  font-size: 13px !important;
  line-height: 1.7 !important;
  color: var(--yh-ink-soft) !important;
  padding-left: 12px;
  border-left: 2px solid var(--yh-sand);
}

.footer-bottom {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 0 var(--gutter) clamp(22px, 3vw, 36px);
}

.gauge-line {
  height: 18px;
  border-bottom: 1.5px solid rgba(27, 58, 107, .3);
  background-image:
    linear-gradient(to top, rgba(27, 58, 107, .32) 0 6px, rgba(27, 58, 107, 0) 6px),
    linear-gradient(to top, rgba(27, 58, 107, .16) 0 11px, rgba(27, 58, 107, 0) 11px);
  background-repeat: repeat-x;
  background-size: 64px 18px, 16px 18px;
  background-position: left bottom, left bottom;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  padding-top: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--yh-gauge);
}

.footer-legal a {
  color: var(--yh-gauge);
  text-decoration: none;
  border-bottom: 1px solid rgba(107, 118, 131, .45);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.footer-legal a:hover {
  color: var(--yh-blue);
  border-bottom-color: var(--yh-blue);
}

.footer-version {
  margin-left: auto;
  color: var(--yh-celadon);
  letter-spacing: .1em;
}

@media (max-width: 1024px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 34px; }
  .footer-rail { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  .footer-inner { grid-template-columns: 1fr; gap: 30px; }
  .footer-legal { font-size: 11px; gap: 6px 14px; }
  .footer-version { margin-left: 0; flex-basis: 100%; }
}

/* ==========================================================================
   18. 减少动态偏好
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

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

  .card:hover { transform: none; }
  .btn:active { transform: none; }
  .footer-link:hover { padding-left: 0; }
}