/* ==========================================================================
   E尊国 · 共享样式 /assets/site.css
   母题：数字高原 · 档案索引 · 玻璃层与实色层并置
   ========================================================================== */

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

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

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

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

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

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

/* ---------- 2. 设计令牌 ---------- */
:root {
  /* 色彩：高原色谱 */
  --c-lake: #176B87;
  --c-lake-deep: #0F5369;
  --c-indigo: #0B2E4F;
  --c-indigo-deep: #08243D;
  --c-shallow: #BFE3E8;
  --c-gold: #D9A441;
  --c-gold-soft: #E8C57E;
  --c-snow: #F7FAF9;
  --c-mist: #EDF3F2;
  --c-salt: #8FA9AD;
  --c-ink: #132F3A;
  --c-data: #2FA8B8;
  --c-rust: #B85C38;

  /* 字体 */
  --font-display: "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB",
    "Source Han Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC",
    "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "SF Mono", "JetBrains Mono",
    "Cascadia Mono", Consolas, "Liberation Mono", monospace;

  /* 尺寸与节奏 */
  --rail-w: 252px;
  --drawer-top: 68px;
  --radius-card: 18px;
  --radius-pill: 999px;
  --gap-xs: 8px;
  --gap-sm: 14px;
  --gap-md: 22px;
  --gap-lg: clamp(28px, 4vw, 48px);
  --gap-xl: clamp(48px, 7vw, 96px);
  --pad-inline: clamp(20px, 5vw, 64px);
  --measure: 68ch;
}

@media (min-width: 1024px) and (max-width: 1279.98px) {
  :root { --rail-w: 214px; }
}

/* ---------- 3. 基础排版（中文优先） ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-ink);
  background: var(--c-snow);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
  word-break: normal;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--c-indigo);
  text-wrap: balance;
}

p { text-wrap: pretty; }

a {
  color: var(--c-lake);
  text-underline-offset: 3px;
}

strong { font-weight: 700; }

code, kbd, samp, .mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: 0.02em;
}

::selection {
  background: var(--c-shallow);
  color: var(--c-indigo);
}

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

#main-content { display: block; }

/* ---------- 4. 通用容器与文本层 ---------- */
.container {
  width: 100%;
  max-width: 1220px;
  margin-inline: auto;
  padding-inline: var(--pad-inline);
}

.prose {
  max-width: var(--measure);
  font-size: 17px;
  line-height: 1.8;
  color: var(--c-ink);
}

.prose > * + * { margin-block-start: 1em; }

.prose h2,
.prose h3 { margin-block-start: 1.8em; }

.prose ul,
.prose ol {
  padding-inline-start: 1.4em;
  list-style: disc;
}

.prose a {
  color: var(--c-lake);
  text-decoration-thickness: 1px;
  text-decoration-color: rgba(23, 107, 135, 0.4);
}

.prose a:hover { text-decoration-color: var(--c-lake); }

/* ---------- 5. 网格与图片容器 ---------- */
.grid {
  display: grid;
  gap: var(--gap-lg);
  grid-template-columns: minmax(0, 1fr);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }

.media { margin: 0; }

.media__frame {
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-card);
  border: 1px solid rgba(143, 169, 173, 0.32);
  background:
    radial-gradient(120% 100% at 12% 0%, rgba(191, 227, 232, 0.9), transparent 58%),
    linear-gradient(150deg, var(--c-mist), #DCE9E8);
}

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

.media__frame--wide { aspect-ratio: 21 / 9; }
.media__frame--square { aspect-ratio: 1 / 1; }

/* 无图占位：盐湖网格 + 风蚀弧线，全部由 CSS 生成 */
.media__frame--empty::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(23, 107, 135, 0.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(23, 107, 135, 0.16) 1px, transparent 1px);
  background-size: 34px 34px;
}

.media__frame--empty::after {
  content: "";
  position: absolute;
  inset-inline-end: -18%;
  inset-block-end: -34%;
  width: 62%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 1px solid rgba(23, 107, 135, 0.28);
  box-shadow:
    0 0 0 18px rgba(23, 107, 135, 0.05),
    0 0 0 44px rgba(23, 107, 135, 0.04);
}

.media__caption {
  margin-block-start: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-salt);
}

/* ---------- 6. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-salt);
}

.breadcrumb a {
  color: var(--c-lake);
  text-decoration: none;
  border-block-end: 1px solid transparent;
  transition: border-color 0.25s ease;
}

.breadcrumb a:hover { border-block-end-color: var(--c-lake); }

.breadcrumb__sep {
  color: var(--c-salt);
  opacity: 0.55;
}

.breadcrumb [aria-current="page"] { color: var(--c-ink); }

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease,
    border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.btn--primary {
  background: var(--c-gold);
  color: var(--c-indigo-deep);
  box-shadow: 0 8px 22px -10px rgba(217, 164, 65, 0.9);
}

.btn--primary:hover {
  background: var(--c-gold-soft);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--c-shallow);
  border-color: rgba(191, 227, 232, 0.42);
}

.btn--ghost:hover {
  background: rgba(191, 227, 232, 0.14);
  color: var(--c-snow);
  border-color: rgba(191, 227, 232, 0.7);
}

.btn:active { transform: translateY(0); }

/* ---------- 8. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  inset-block-start: 10px;
  inset-inline-start: 10px;
  z-index: 300;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--c-gold);
  color: var(--c-indigo-deep);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 0.24s ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline-offset: 2px;
}

/* ---------- 9. 头部：左侧垂直轨道 ---------- */
.site-header {
  position: fixed;
  inset-block: 0;
  inset-inline-start: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  width: var(--rail-w);
  background: var(--c-indigo);
  color: var(--c-snow);
  border-inline-end: 1px solid rgba(191, 227, 232, 0.18);
  isolation: isolate;
}

/* 轨道底纹：数据网格 */
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(191, 227, 232, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(191, 227, 232, 0.07) 1px, transparent 1px);
  background-size: 30px 30px;
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 26%, #000 74%, transparent);
  mask-image: linear-gradient(180deg, transparent, #000 26%, #000 74%, transparent);
  pointer-events: none;
}

.header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 0;
  padding: 22px 20px 18px;
  border-block-end: 1px solid rgba(191, 227, 232, 0.14);
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  text-decoration: none;
  color: inherit;
}

.brand__mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border-radius: 4px 14px 4px 4px;
  background: var(--c-lake);
  color: var(--c-snow);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
  box-shadow: inset 0 0 0 1px rgba(247, 250, 249, 0.28);
  transition: background-color 0.25s ease, border-radius 0.3s ease;
}

.brand:hover .brand__mark {
  background: var(--c-data);
  border-radius: 14px 4px 4px 4px;
}

.brand__text {
  display: block;
  min-width: 0;
}

.brand__name {
  display: block;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--c-snow);
  line-height: 1.2;
}

.brand__desc {
  display: block;
  margin-block-start: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--c-shallow);
  opacity: 0.82;
  white-space: nowrap;
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  border: 1px solid rgba(191, 227, 232, 0.34);
  border-radius: var(--radius-pill);
  background: rgba(191, 227, 232, 0.1);
  color: var(--c-snow);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.nav-toggle:hover {
  background: rgba(191, 227, 232, 0.2);
  border-color: rgba(191, 227, 232, 0.6);
}

.nav-toggle__bars {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 10px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  transition: top 0.28s ease, transform 0.28s ease;
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { top: 8px; }

.site-header[data-open] .nav-toggle__bars::before {
  top: 4px;
  transform: rotate(45deg);
}

.site-header[data-open] .nav-toggle__bars::after {
  top: 4px;
  transform: rotate(-45deg);
}

/* 导航 */
.site-nav {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 16px;
  min-height: 0;
  padding: 20px 16px 22px;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.nav-eyebrow {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding-inline-start: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--c-salt);
}

.nav-eyebrow__code {
  color: var(--c-gold);
  opacity: 0.9;
}

.nav-list {
  display: grid;
  gap: 2px;
}

.nav-item { min-width: 0; }

.nav-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-inline-start: 2px solid transparent;
  border-radius: 0 8px 8px 0;
  color: rgba(247, 250, 249, 0.78);
  font-size: 15px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background-color 0.25s ease, color 0.25s ease,
    border-color 0.25s ease;
}

.nav-link__index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--c-salt);
  transition: color 0.25s ease;
}

.nav-link__label {
  min-width: 0;
  white-space: nowrap;
}

.nav-link:hover {
  background: rgba(191, 227, 232, 0.12);
  color: var(--c-snow);
}

.nav-link:hover .nav-link__index { color: var(--c-gold); }

.nav-link[aria-current="page"] {
  background: rgba(47, 168, 184, 0.22);
  border-inline-start-color: var(--c-gold);
  color: #FFFFFF;
  font-weight: 600;
}

.nav-link[aria-current="page"] .nav-link__index { color: var(--c-gold); }

.nav-actions {
  display: grid;
  gap: 8px;
  margin-block-start: auto;
  padding-block-start: 16px;
  border-block-start: 1px solid rgba(191, 227, 232, 0.14);
}

.nav-actions .btn {
  width: 100%;
  padding: 10px 14px;
  font-size: 13px;
  letter-spacing: 0.04em;
}

/* 滚动进度条（轨道右缘） */
.progress {
  position: absolute;
  inset-block: 0;
  inset-inline-end: -1px;
  width: 3px;
  background: rgba(191, 227, 232, 0.12);
  pointer-events: none;
}

.progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleY(0);
  transform-origin: 50% 0;
  background: linear-gradient(180deg, var(--c-gold), var(--c-data));
}

/* 桌面端为主区块让出轨道宽度 */
@media (min-width: 1024px) {
  body { padding-inline-start: var(--rail-w); }
}

/* ---------- 10. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  margin-block-start: clamp(64px, 9vw, 120px);
  padding-block: clamp(44px, 6vw, 84px) 28px;
  padding-inline: var(--pad-inline);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(47, 168, 184, 0.3), transparent 58%),
    radial-gradient(90% 70% at 0% 100%, rgba(23, 107, 135, 0.42), transparent 62%),
    linear-gradient(180deg, var(--c-indigo) 0%, var(--c-indigo-deep) 100%);
  color: rgba(247, 250, 249, 0.82);
  font-size: 14.5px;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(191, 227, 232, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(191, 227, 232, 0.06) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 68%);
  mask-image: linear-gradient(180deg, #000, transparent 68%);
  pointer-events: none;
}

@media (min-width: 1024px) {
  .site-footer {
    margin-inline-start: calc(-1 * var(--rail-w));
    padding-inline-start: calc(var(--rail-w) + var(--pad-inline));
  }
}

.footer__grid {
  position: relative;
  display: grid;
  gap: clamp(28px, 3.4vw, 52px);
  grid-template-columns: minmax(0, 1fr);
  max-width: 1320px;
}

.footer__brand { min-width: 0; }

.footer__brand-name {
  font-family: var(--font-display);
  font-size: clamp(28px, 3vw, 36px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.1;
  color: var(--c-snow);
}

.footer__brand-desc {
  margin-block-start: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--c-gold);
}

.footer__brand-code {
  margin-block-start: 20px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: rgba(191, 227, 232, 0.5);
}

.footer__brand-note {
  margin-block-start: 14px;
  max-width: 26ch;
  line-height: 1.85;
  color: rgba(247, 250, 249, 0.7);
}

.footer__links {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr));
}

.footer__col { min-width: 0; }

.footer__heading {
  margin-block-end: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  line-height: 1.4;
  color: var(--c-gold);
}

.footer__list {
  display: grid;
  gap: 10px;
}

.footer__link {
  display: inline-block;
  color: rgba(247, 250, 249, 0.76);
  font-size: 14.5px;
  text-decoration: none;
  border-block-end: 1px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.footer__link:hover {
  color: var(--c-snow);
  border-block-end-color: var(--c-gold);
}

/* 联系入口：玻璃卡片 */
.footer__contact {
  position: relative;
  min-width: 0;
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid rgba(191, 227, 232, 0.22);
  border-radius: 20px;
  background: rgba(191, 227, 232, 0.08);
  -webkit-backdrop-filter: blur(10px) saturate(120%);
  backdrop-filter: blur(10px) saturate(120%);
  box-shadow:
    0 30px 70px -34px rgba(0, 0, 0, 0.85),
    inset 0 1px 0 rgba(247, 250, 249, 0.14);
}

.footer__contact::before {
  content: "";
  position: absolute;
  inset-block-start: 0;
  inset-inline: 20px;
  height: 2px;
  border-radius: 0 0 2px 2px;
  background: linear-gradient(90deg, var(--c-gold), rgba(217, 164, 65, 0));
}

.footer__contact-heading {
  margin-block-end: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  line-height: 1.4;
  color: var(--c-gold);
}

.contact-list {
  display: grid;
  gap: 14px;
}

.contact-item {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.contact-item__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: rgba(191, 227, 232, 0.72);
}

.contact-item__value {
  justify-self: start;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--c-snow);
  text-decoration: none;
  overflow-wrap: anywhere;
  border-block-end: 1px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
}

a.contact-item__value:hover {
  color: var(--c-gold-soft);
  border-block-end-color: var(--c-gold);
}

.contact-item__value--plain { color: rgba(247, 250, 249, 0.78); }

.footer__note {
  margin-block-start: 18px;
  padding-block-start: 14px;
  border-block-start: 1px solid rgba(191, 227, 232, 0.16);
  font-size: 12.5px;
  line-height: 1.75;
  color: rgba(191, 227, 232, 0.72);
}

/* 页脚底栏 */
.footer__base {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  margin-block-start: clamp(34px, 5vw, 62px);
  padding-block-start: 20px;
  border-block-start: 1px solid rgba(191, 227, 232, 0.16);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  line-height: 1.7;
  color: rgba(191, 227, 232, 0.66);
}

.footer__copyright { margin: 0; }

.footer__year { color: var(--c-gold); }

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
}

.footer__legal .footer__link {
  font-size: inherit;
  letter-spacing: inherit;
  color: inherit;
}

.footer__legal .footer__link:hover { color: var(--c-snow); }

.footer__icp {
  margin: 0;
  color: rgba(191, 227, 232, 0.6);
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
  }
  .footer__contact { grid-column: 1 / -1; }
}

@media (min-width: 1080px) {
  .footer__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1.28fr) minmax(0, 1.08fr);
    align-items: start;
  }
  .footer__contact { grid-column: auto; }
}

/* ---------- 11. 移动端头部与抽屉 ---------- */
@media (max-width: 1023.98px) {
  .site-header {
    position: sticky;
    inset-block-start: 0;
    inset-inline: 0;
    inset-block-end: auto;
    width: 100%;
    height: auto;
    background: rgba(11, 46, 79, 0.97);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-inline-end: none;
    border-block-end: 1px solid rgba(191, 227, 232, 0.18);
  }

  .site-header::before { display: none; }

  .header__top {
    min-height: var(--drawer-top);
    padding: 12px clamp(16px, 4vw, 28px);
    border-block-end: none;
  }

  .brand__mark {
    width: 34px;
    height: 34px;
    font-size: 16px;
  }

  .brand__name { font-size: 16px; }

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

  .site-nav {
    position: fixed;
    inset-block-start: var(--drawer-top);
    inset-inline: 0;
    inset-block-end: 0;
    display: flex;
    flex-direction: column;
    gap: 18px;
    padding: 20px clamp(16px, 4vw, 28px) 40px;
    border-block-start: 1px solid rgba(191, 227, 232, 0.16);
    background: var(--c-indigo);
    overflow-y: auto;
    overscroll-behavior: contain;
    opacity: 0;
    visibility: hidden;
    transform: translate3d(0, -10px, 0);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
  }

  .site-header[data-open] .site-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-eyebrow { padding-inline-start: 0; }

  .nav-link {
    padding: 14px 10px;
    border-inline-start-width: 3px;
    font-size: 17px;
    border-block-end: 1px solid rgba(191, 227, 232, 0.1);
    border-radius: 0;
  }

  .nav-link__index { font-size: 11px; }

  .nav-actions { margin-block-start: 10px; }

  .nav-actions .btn {
    padding: 13px 18px;
    font-size: 14.5px;
  }

  .progress { display: none; }
}

/* ---------- 12. 滚动显现协议 ---------- */
[data-reveal] {
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: var(--reveal-delay, 0ms);
}

html[data-reveal-ready] [data-reveal] {
  opacity: 0;
  transform: translate3d(0, 14px, 0);
}

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

/* ---------- 13. 无障碍：降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

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

  .btn:hover,
  .brand:hover .brand__mark { transform: none; }
}

/* 高对比偏好下加强边界 */
@media (prefers-contrast: more) {
  .site-header,
  .site-footer,
  .footer__contact { border-color: rgba(247, 250, 249, 0.6); }
  .nav-link { color: #FFFFFF; }
}