/* ==========================================================================
   JDB 电子 · 简体中文官网  —  共享样式表 /assets/site.css
   设计语言：技术蓝图网格 + 数字化档案室
   ========================================================================== */

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

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

body, h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video, canvas { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; height: 1px; background: var(--ink-500); margin: 0; }
address { font-style: normal; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  /* 色板 */
  --ink-900: #0B1B2B;
  --ink-800: #0E2233;
  --ink-700: #14293D;
  --ink-500: #1F3D57;
  --cyan-400: #35E0D6;
  --cyan-200: #9BF2EA;
  --cyan-ink: #0E7A73;
  --amber-400: #F2A63B;
  --amber-200: #FBD9A5;
  --paper-100: #F4EFE6;
  --paper-300: #D9D0C1;
  --mist-300: #A8B6C4;
  --white: #FFFFFF;

  --text-on-dark: #E8EFF5;
  --text-on-paper: #14293D;
  --muted-on-dark: #A8B6C4;
  --muted-on-paper: #5B6B75;

  /* 字体 */
  --font-display: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 字号阶梯 */
  --step-xs: 12px;
  --step-sm: 14px;
  --step-md: 16px;
  --step-lg: 18px;
  --step-xl: 22px;
  --step-2xl: 30px;
  --step-3xl: 44px;

  /* 布局 */
  --container: 1320px;
  --gutter: 24px;
  --pad-x: 5vw;
  --rail-h: 36px;
  --bar-h: 68px;

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

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  color: var(--text-on-dark);
  background-color: var(--ink-900);
  background-image:
    linear-gradient(to right, rgba(31, 61, 87, .50) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(31, 61, 87, .32) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--white);
  font-stretch: 92%;
}

h2 { font-size: clamp(26px, 3.2vw, 40px); }
h3 { font-size: clamp(19px, 2vw, 24px); line-height: 1.25; }
h4 { font-size: var(--step-lg); line-height: 1.35; letter-spacing: 0; }

p { max-width: 42em; }

::selection { background: var(--amber-400); color: var(--ink-900); }

:focus-visible {
  outline: 2px solid var(--amber-400);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---------- 4. 通用容器与栅格 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.section { padding-block: clamp(56px, 7vw, 104px); }

.grid {
  display: grid;
  gap: var(--gutter);
}

.grid--12 { grid-template-columns: repeat(12, minmax(0, 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-9  { grid-column: span 9; }
.span-12 { grid-column: span 12; }

/* ---------- 5. 表面分区 ---------- */
.surface-dark {
  background-color: var(--ink-900);
  color: var(--text-on-dark);
}

.surface-panel {
  background-color: var(--ink-700);
  color: var(--text-on-dark);
  border-block: 1px solid var(--ink-500);
}

.surface-paper {
  background-color: var(--paper-100);
  background-image:
    repeating-linear-gradient(135deg, rgba(217, 208, 193, .55) 0 1px, transparent 1px 9px);
  color: var(--text-on-paper);
  border-block: 1px solid var(--paper-300);
}

.surface-paper h1,
.surface-paper h2,
.surface-paper h3,
.surface-paper h4 { color: var(--ink-900); }

.surface-paper a { color: var(--cyan-ink); }
.surface-paper .eyebrow { color: var(--cyan-ink); }
.surface-paper .tag {
  background: rgba(14, 122, 115, .10);
  border-color: rgba(14, 122, 115, .35);
  color: var(--cyan-ink);
}

/* ---------- 6. 文字层组件 ---------- */
.display-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: 92%;
  font-size: clamp(44px, 7vw, 112px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--white);
}

.serif-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.5;
  letter-spacing: 0;
  color: var(--white);
}

.surface-paper .serif-title { color: var(--ink-900); }

.lede {
  font-size: var(--step-lg);
  line-height: 1.72;
  color: #C7D5E2;
}

.surface-paper .lede { color: #3A4A58; }

.measure { max-width: 34em; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: 0.85;
}

.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted-on-dark);
}

.surface-paper .mono { color: var(--muted-on-paper); }

/* 批次编号标签 */
.batch-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border-radius: 2px;
  background: var(--amber-400);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.10em;
  line-height: 1.5;
  white-space: nowrap;
}

/* 描边状态标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 9px;
  border-radius: 2px;
  border: 1px solid rgba(53, 224, 214, .32);
  background: rgba(53, 224, 214, .12);
  color: var(--cyan-400);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  white-space: nowrap;
}

.tag--amber {
  border-color: rgba(242, 166, 59, .40);
  background: rgba(242, 166, 59, .14);
  color: var(--amber-400);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 3px;
  font-family: var(--font-display);
  font-size: var(--step-sm);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  white-space: nowrap;
  transition:
    background-color 180ms var(--ease),
    color 180ms var(--ease),
    border-color 180ms var(--ease),
    transform 180ms var(--ease);
}

.btn--amber {
  background: var(--amber-400);
  color: var(--ink-900);
}

.btn--amber:hover { background: var(--amber-200); transform: translateY(-1px); }

.btn--ghost {
  border-color: var(--ink-500);
  color: var(--text-on-dark);
}

.btn--ghost:hover { border-color: var(--cyan-400); color: var(--cyan-400); }

.surface-paper .btn--ghost {
  border-color: var(--paper-300);
  color: var(--ink-900);
}

.surface-paper .btn--ghost:hover {
  border-color: var(--cyan-ink);
  color: var(--cyan-ink);
}

/* ---------- 8. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 3px;
  background: var(--amber-400);
  color: var(--ink-900);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-sm);
  transition: top 180ms var(--ease);
}

.skip-link:focus { top: 16px; }

/* ---------- 9. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 27, 43, .82);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid rgba(31, 61, 87, .90);
  transition:
    background-color 180ms var(--ease),
    border-color 180ms var(--ease),
    box-shadow 180ms var(--ease);
}

.site-header.is-scrolled {
  background: var(--ink-700);
  border-bottom-color: var(--ink-500);
  box-shadow: 0 20px 42px -30px #000;
}

/* 档案轨道 */
.header-rail {
  border-bottom: 1px solid rgba(31, 61, 87, .70);
  background: rgba(20, 41, 61, .55);
}

.header-rail__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: var(--rail-h);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.10em;
  color: var(--muted-on-dark);
}

.rail-brand {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--mist-300);
}

.rail-tools {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-left: auto;
}

.tool-link {
  position: relative;
  padding-block: 2px;
  color: var(--muted-on-dark);
  transition: color 180ms var(--ease);
}

.tool-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms var(--ease);
}

.tool-link:hover,
.tool-link:focus-visible { color: var(--cyan-400); }

.tool-link:hover::after,
.tool-link:focus-visible::after { transform: scaleX(1); }

/* 主条 */
.header-bar__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: var(--bar-h);
  transition: min-height 180ms var(--ease);
}

.is-scrolled .header-bar__inner { min-height: 60px; }

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding-block: 8px;
  flex: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 14px 4px 14px 4px;
  background: var(--amber-400);
  box-shadow: inset 0 0 0 1px rgba(11, 27, 43, .28);
  color: var(--ink-900);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.02em;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--white);
}

.brand__sub {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist-300);
}

/* 主导航（桌面） */
.primary-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 28px;
  margin-right: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: 3px;
  font-size: var(--step-sm);
  font-weight: 500;
  color: var(--text-on-dark);
  transition:
    color 180ms var(--ease),
    background-color 180ms var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 7px;
  height: 2px;
  background: var(--amber-400);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 200ms var(--ease);
}

.nav-link:hover {
  color: var(--white);
  background: rgba(53, 224, 214, .08);
}

.nav-link:hover::after { transform: scaleX(.55); }

.nav-link[aria-current="page"] { color: var(--cyan-400); }

.nav-link[aria-current="page"]::after {
  background: var(--cyan-400);
  transform: scaleX(1);
}

.nav-utility { display: none; }

.nav-utility__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--ink-500);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.10em;
  color: var(--mist-300);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.nav-utility__link:hover {
  border-color: var(--cyan-400);
  color: var(--cyan-400);
}

/* 右侧动作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.header-cta { flex: none; }

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--ink-500);
  border-radius: 3px;
  color: var(--text-on-dark);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.10em;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.nav-toggle:hover { border-color: var(--cyan-400); color: var(--cyan-400); }

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform 200ms var(--ease), opacity 200ms var(--ease);
}

.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(2.75px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2) {
  transform: translateY(-2.75px) rotate(-45deg);
}

/* 滚动进度尺 */
.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}

.scroll-meter__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--amber-400);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 100ms linear;
}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb {
  padding-block: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--muted-on-dark);
}

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

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

.breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--ink-500);
}

.breadcrumb__list a { transition: color 180ms var(--ease); }
.breadcrumb__list a:hover { color: var(--cyan-400); }

.surface-paper .breadcrumb { color: var(--muted-on-paper); }
.surface-paper .breadcrumb__list li + li::before { color: var(--paper-300); }

/* ---------- 11. 图像容器（页面阶段放置占位） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--ink-500);
  border-radius: 14px 4px 14px 4px;
  background: var(--ink-700);
}

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

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3  { aspect-ratio: 4 / 3; }
.media-frame--3x2  { aspect-ratio: 3 / 2; }

.media-frame--empty {
  display: grid;
  place-items: center;
  padding: 20px;
  background:
    repeating-linear-gradient(45deg, rgba(31, 61, 87, .55) 0 1px, transparent 1px 10px),
    var(--ink-700);
  color: var(--muted-on-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-align: center;
}

.surface-paper .media-frame {
  border-color: var(--paper-300);
  background: #EAE3D7;
}

.surface-paper .media-frame--empty {
  background:
    repeating-linear-gradient(45deg, rgba(217, 208, 193, .85) 0 1px, transparent 1px 10px),
    #EAE3D7;
  color: var(--muted-on-paper);
}

.media-frame__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--muted-on-dark);
}

.surface-paper .media-frame__caption { color: var(--muted-on-paper); }

/* ---------- 12. 滚动显现 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

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

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  padding-block: 60px 28px;
  border-top: 1px solid var(--ink-500);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(120% 90% at 88% 0%, rgba(53, 224, 214, .10) 0%, transparent 58%),
    linear-gradient(to right, rgba(31, 61, 87, .55) 1px, transparent 1px);
  background-size: auto, 120px 100%;
  color: var(--text-on-dark);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.55fr);
  gap: 48px;
  align-items: start;
}

.brand--footer { padding-block: 0; }

.footer-motto {
  margin-top: 18px;
  max-width: 22em;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.65;
  color: #C7D5E2;
}

.footer-meta {
  margin-top: 16px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--amber-400);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  line-height: 1.5;
  color: var(--amber-400);
}

.footer-heading::before {
  content: "";
  width: 14px;
  height: 1px;
  background: var(--amber-400);
}

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

.footer-link {
  display: inline-block;
  padding-block: 6px;
  font-size: var(--step-sm);
  color: var(--mist-300);
  transition: color 180ms var(--ease), transform 180ms var(--ease);
}

.footer-link:hover {
  color: var(--cyan-400);
  transform: translateX(2px);
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 30px;
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid var(--ink-500);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted-on-dark);
}

.footer-contact__label {
  padding: 2px 8px;
  border: 1px solid rgba(242, 166, 59, .40);
  border-radius: 2px;
  color: var(--amber-400);
  font-size: 10.5px;
  letter-spacing: 0.18em;
}

.footer-contact__item { white-space: normal; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--ink-500);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted-on-dark);
}

.footer-legal { max-width: none; }

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-legal-link {
  color: var(--muted-on-dark);
  transition: color 180ms var(--ease);
}

.footer-legal-link:hover { color: var(--cyan-400); }

.footer-stamp {
  position: absolute;
  right: calc(var(--pad-x) - 6px);
  bottom: 30px;
  display: grid;
  place-items: center;
  gap: 2px;
  padding: 14px 13px;
  border: 1px solid rgba(242, 166, 59, .28);
  border-radius: 50%;
  transform: rotate(-8deg);
  font-family: var(--font-mono);
  font-size: 9.5px;
  line-height: 1.3;
  letter-spacing: 0.22em;
  text-align: center;
  color: rgba(242, 166, 59, .55);
  pointer-events: none;
  user-select: none;
}

/* ---------- 14. 响应式：平板与手机 ---------- */
@media (max-width: 1023px) {
  :root { --bar-h: 62px; }

  .header-bar__inner { gap: 14px; }

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 18px;
    margin: 0;
    padding: 16px var(--pad-x) 26px;
    max-height: 76vh;
    overflow-y: auto;
    background: var(--ink-800);
    border-top: 1px solid var(--ink-500);
    border-bottom: 1px solid var(--ink-500);
    box-shadow: 0 30px 50px -34px #000;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition:
      opacity 180ms var(--ease),
      transform 220ms var(--ease),
      visibility 220ms var(--ease);
  }

  .site-header[data-open="true"] .primary-nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    counter-reset: navidx;
  }

  .nav-item {
    counter-increment: navidx;
    border-bottom: 1px solid rgba(31, 61, 87, .85);
  }

  .nav-item:first-child { border-top: 1px solid rgba(31, 61, 87, .85); }

  .nav-link {
    width: 100%;
    min-height: 56px;
    padding-inline: 4px;
    justify-content: space-between;
    border-radius: 0;
    font-family: var(--font-display);
    font-size: 17px;
    font-weight: 700;
  }

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

  .nav-link::before {
    content: "0" counter(navidx);
    order: 2;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 400;
    letter-spacing: 0.14em;
    color: var(--ink-500);
  }

  .nav-link[aria-current="page"]::before { color: var(--cyan-400); }

  .nav-utility {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding-top: 16px;
    border-top: 1px solid var(--ink-500);
  }

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

  body.nav-open { overflow: hidden; }

  .footer-top {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
  }

  .footer-stamp { display: none; }
}

@media (max-width: 899px) {
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

  .span-3,
  .span-4,
  .span-5 { grid-column: span 3; }

  .span-6 { grid-column: span 6; }

  .span-7,
  .span-8,
  .span-9,
  .span-12 { grid-column: span 6; }
}

@media (max-width: 599px) {
  body { font-size: 16px; }

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

  .span-3,
  .span-4,
  .span-5,
  .span-6,
  .span-7,
  .span-8,
  .span-9,
  .span-12 { grid-column: span 1; }

  .rail-brand { display: none; }

  .header-rail__inner { gap: 10px; }

  .rail-tools { margin-left: 0; gap: 14px; }

  .footer-cols { grid-template-columns: minmax(0, 1fr); gap: 26px; }

  .footer-contact { gap: 8px 18px; }

  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 419px) {
  .header-cta { display: none; }
  .rail-tools { display: none; }
}

/* ---------- 15. 无障碍与降低动效 ---------- */
@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;
  }

  html.js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .scroll-meter__bar { transition: none !important; }
}