/* =========================================================
   澳亚国际CN视野 — 共享样式 /assets/site.css
   01 重置与令牌  02 基础排版  03 布局网格  04 通用组件
   05 站点头部    06 站点页脚  07 响应式与动效降级
   ========================================================= */

/* ---------- 01 重置与令牌 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dt, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
img, svg, video { display: block; max-width: 100%; }
[hidden] { display: none !important; }

:root {
  /* 矿物色体系 */
  --abyss: #0B2239;
  --midnight: #061726;
  --paper: #F2F1EC;
  --paper-2: #FBFAF6;
  --silver: #C7D0D8;
  --stone: #8A8F94;
  --aurora: #35D6C4;
  --coral: #FF6B4A;
  --moss: #6E8B6A;
  --terracotta: #C4714B;
  --mineral: #7C7BB0;

  /* 语义色 */
  --ink: #0B2239;
  --ink-soft: #2C3A46;
  --ink-mute: #5A6570;
  --rule: rgba(11, 34, 57, .14);
  --rule-strong: rgba(11, 34, 57, .28);
  --rule-dark: rgba(199, 208, 216, .18);
  --rule-dark-2: rgba(199, 208, 216, .34);

  /* 字体栈 */
  --font-display: "Archivo Narrow", "Roboto Condensed", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  /* 七级字号 */
  --step-1: 12px;
  --step-2: 14px;
  --step-3: 18px;
  --step-4: 24px;
  --step-5: 34px;
  --step-6: 48px;
  --step-7: 72px;

  /* 度量 */
  --shell: 1240px;
  --pad: clamp(16px, 4vw, 48px);
  --header-h: 66px;
  --radius: 2px;
}

/* ---------- 02 基础排版 ---------- */
body {
  background-color: var(--paper);
  background-image: repeating-linear-gradient(180deg, rgba(11, 34, 57, .03) 0 1px, transparent 1px 88px);
  color: var(--ink-soft);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: .1em;
  color: var(--ink);
}
h1 { font-size: clamp(28px, 5vw, var(--step-6)); letter-spacing: .12em; }
h2 { font-size: clamp(22px, 3.4vw, var(--step-5)); }
h3 { font-size: var(--step-3); }
p { color: var(--ink-soft); }
strong { color: var(--ink); font-weight: 600; }
small { font-size: var(--step-1); }

::selection { background: var(--aurora); color: var(--midnight); }

:focus-visible {
  outline: 2px solid var(--aurora);
  outline-offset: 3px;
  border-radius: var(--radius);
}
.site-footer :focus-visible { outline-color: var(--coral); }

.skip-link {
  position: absolute;
  left: 16px;
  top: -70px;
  z-index: 140;
  display: inline-block;
  padding: 10px 18px;
  background: var(--coral);
  color: var(--midnight);
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: .14em;
  border-radius: var(--radius);
  transition: top .2s ease;
}
.skip-link:focus { top: 12px; }

.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;
}
.mono {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: .16em;
  color: var(--stone);
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: .2em;
  color: var(--stone);
  display: block;
}

/* ---------- 03 布局网格 ---------- */
.wrap {
  width: min(var(--shell), 100%);
  margin-inline: auto;
  padding-inline: var(--pad);
}
.wrap--wide { width: min(1440px, 100%); }
.wrap--narrow { width: min(880px, 100%); }

.grid { display: grid; gap: clamp(16px, 2.2vw, 32px); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--tight { gap: clamp(10px, 1.4vw, 18px); }
.grid--loose { gap: clamp(28px, 5vw, 64px); }

/* 展览画册节律：宽窄交替的章节留白 */
.section { padding-block: clamp(40px, 7vw, 96px); }
.section--air { padding-block: clamp(64px, 12vw, 168px); }
.section--deep { background: var(--abyss); color: var(--silver); }
.section--deeper { background: var(--midnight); color: var(--silver); }
.section--deep h1, .section--deep h2, .section--deep h3,
.section--deeper h1, .section--deeper h2, .section--deeper h3 { color: var(--paper); }
.section--deep p, .section--deeper p { color: var(--silver); }

/* 栏目色相偏移 */
.tone-moss { --tone: var(--moss); }
.tone-terracotta { --tone: var(--terracotta); }
.tone-mineral { --tone: var(--mineral); }
.tone-aurora { --tone: var(--aurora); }
.tone-coral { --tone: var(--coral); }
.tone-abyss { --tone: var(--abyss); }

/* ---------- 04 通用组件 ---------- */
/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55em;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: var(--step-2);
  font-weight: 600;
  letter-spacing: .12em;
  line-height: 1.2;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease, transform .2s ease;
}
.btn--primary { background: var(--coral); color: var(--midnight); }
.btn--primary:hover { background: #FF8A6E; transform: translateY(-1px); }
.btn--ghost { border-color: var(--rule-dark-2); color: var(--paper); }
.btn--ghost:hover { border-color: var(--aurora); color: var(--aurora); }
.btn--quiet { border-color: var(--rule-strong); color: var(--ink); }
.btn--quiet:hover { border-color: var(--abyss); background: var(--abyss); color: var(--paper); }
.btn--sm { padding: 9px 15px; font-size: var(--step-1); letter-spacing: .14em; }

/* 面包屑 */
.crumbs {
  padding-block: 16px 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--stone);
}
.crumbs__list { display: flex; flex-wrap: wrap; align-items: center; gap: 0; }
.crumbs__list li { display: flex; align-items: center; }
.crumbs__list li + li::before {
  content: "/";
  margin: 0 10px;
  color: rgba(138, 143, 148, .6);
}
.crumbs__link { color: var(--stone); border-bottom: 1px solid transparent; }
.crumbs__link:hover { color: var(--aurora); border-bottom-color: var(--aurora); }
.crumbs__list [aria-current="page"] { color: var(--ink); }

/* 正文容器 */
.prose { max-width: 68ch; font-size: 16px; line-height: 1.8; }
.prose > * + * { margin-top: 1.2em; }
.prose h2 { font-size: var(--step-4); margin-top: 2.2em; }
.prose h3 { font-size: var(--step-3); margin-top: 1.8em; }
.prose ul { display: grid; gap: .5em; }
.prose ul li { position: relative; padding-left: 1.25em; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0; top: .78em;
  width: 10px; height: 1px;
  background: var(--coral);
}
.prose ol { list-style: decimal; padding-left: 1.4em; }
.prose ol li { margin-top: .5em; }
.prose a { color: var(--abyss); border-bottom: 1px solid var(--aurora); }
.prose a:hover { color: var(--aurora); }
.prose blockquote {
  border-left: 2px solid var(--moss);
  padding-left: 1.2em;
  font-family: var(--font-serif);
  font-size: var(--step-3);
  color: var(--ink);
}
.prose code {
  font-family: var(--font-mono);
  font-size: .9em;
  background: rgba(11, 34, 57, .06);
  padding: 2px 6px;
  border-radius: var(--radius);
}

/* 章节头 */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: clamp(12px, 2vw, 26px);
  padding-top: clamp(24px, 4vw, 46px);
  border-top: 1px solid var(--rule);
}
.section--deep .section-head, .section--deeper .section-head { border-top-color: var(--rule-dark); }
.section-head__code {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: .22em;
  color: var(--tone, var(--stone));
}
.section-head__title { font-size: clamp(22px, 3.2vw, var(--step-5)); letter-spacing: .14em; }
.section-head__note {
  margin-left: auto;
  max-width: 40ch;
  font-size: var(--step-2);
  color: var(--ink-mute);
}
.section--deep .section-head__note, .section--deeper .section-head__note { color: var(--silver); }

/* 纸张叠层卡片 */
.sheet {
  position: relative;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: clamp(18px, 2.6vw, 32px);
  box-shadow: 0 1px 0 rgba(11, 34, 57, .05);
}
.sheet--stack {
  box-shadow:
    6px 6px 0 -1px rgba(199, 208, 216, .6),
    12px 12px 0 -2px rgba(199, 208, 216, .32);
}
.sheet--dark {
  background: rgba(255, 255, 255, .04);
  border-color: var(--rule-dark);
  color: var(--silver);
  box-shadow: none;
}
.sheet--accent { border-top: 2px solid var(--tone, var(--coral)); }
.sheet__cut {
  position: absolute;
  top: 0; right: 0;
  width: 14px; height: 14px;
  border-left: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: linear-gradient(225deg, transparent 48%, var(--rule) 50%, transparent 52%);
}

/* 索引标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .5em;
  padding: 4px 11px;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  line-height: 1.6;
  color: var(--tag, var(--stone));
}
.tag--moss { --tag: var(--moss); }
.tag--terracotta { --tag: var(--terracotta); }
.tag--mineral { --tag: var(--mineral); }
.tag--aurora { --tag: var(--aurora); }
.tag--coral { --tag: var(--coral); }
.tag--plain { --tag: var(--ink-mute); }

/* 图版容器（页面阶段放图片占位） */
.figure { margin: 0; }
.figure__frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 120% at 12% 0%, rgba(11, 34, 57, .92) 0%, rgba(6, 23, 38, .78) 55%, rgba(53, 214, 196, .22) 100%);
}
.figure__frame--tall { aspect-ratio: 4 / 5; }
.figure__frame--wide { aspect-ratio: 21 / 9; }
.figure__frame--square { aspect-ratio: 1 / 1; }
.figure__frame img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.02);
}
.figure__grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(199, 208, 216, .16) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(90deg, rgba(199, 208, 216, .16) 0 1px, transparent 1px 44px);
}
.figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--stone);
}

/* 折叠面板 */
.fold { border-top: 1px solid var(--rule); }
.fold:last-child { border-bottom: 1px solid var(--rule); }
.section--deep .fold, .section--deeper .fold { border-color: var(--rule-dark); }
.fold__button {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px 2px;
  text-align: left;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: var(--step-3);
  letter-spacing: .08em;
  line-height: 1.5;
}
.section--deep .fold__button, .section--deeper .fold__button { color: var(--paper); }
.fold__button:hover { color: var(--aurora); }
.fold__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--tone, var(--stone));
}
.fold__arrow {
  flex: 0 0 auto;
  margin-left: auto;
  width: 9px; height: 9px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(-45deg);
  transition: transform .2s ease, color .2s ease;
}
.fold__button[aria-expanded="true"] { color: var(--coral); }
.fold__button[aria-expanded="true"] .fold__arrow { transform: rotate(45deg); }
.fold__panel { height: 0; overflow: hidden; transition: height .2s ease; }
.fold__panel-inner {
  padding: 0 0 24px;
  max-width: 72ch;
  font-size: 15px;
  color: var(--ink-mute);
}
.section--deep .fold__panel-inner, .section--deeper .fold__panel-inner { color: var(--silver); }

/* 筛选片 */
.chip {
  display: inline-flex;
  align-items: center;
  gap: .5em;
  padding: 6px 14px;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--ink-mute);
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}
.chip:hover { border-color: var(--abyss); color: var(--abyss); }
.chip[aria-pressed="true"] { background: var(--abyss); border-color: var(--abyss); color: var(--paper); }

/* 复制按钮 */
.copy {
  display: inline-flex;
  align-items: center;
  padding: 5px 11px;
  border: 1px solid var(--rule-dark-2);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--silver);
  transition: color .2s ease, border-color .2s ease;
}
.copy:hover { border-color: var(--aurora); color: var(--aurora); }
.copy[data-copied="true"] { border-color: var(--coral); color: var(--coral); }

/* 显现动效协议 */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .24s ease, transform .24s ease;
}
.has-js [data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 05 站点头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--abyss);
  color: var(--paper);
  border-bottom: 1px solid var(--rule-dark);
}
.site-header__inner {
  position: relative;
  display: flex;
  align-items: stretch;
  gap: clamp(12px, 2vw, 30px);
  width: min(1480px, 100%);
  margin-inline: auto;
  padding-inline: var(--pad);
  min-height: var(--header-h);
}

/* 品牌 */
.brand { display: flex; align-items: center; }
.brand__link, .brand--footer {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.brand__mark {
  position: relative;
  flex: 0 0 auto;
  width: 26px; height: 26px;
  border: 1px solid var(--aurora);
  border-radius: 50%;
}
.brand__mark::before, .brand__mark::after {
  content: "";
  position: absolute;
  background: var(--aurora);
}
.brand__mark::before { left: 50%; top: -5px; bottom: -5px; width: 1px; transform: translateX(-50%); }
.brand__mark::after { top: 50%; left: -5px; right: -5px; height: 1px; transform: translateY(-50%); }
.brand__text { display: flex; flex-direction: column; gap: 1px; }
.brand__name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--paper);
  white-space: nowrap;
}
.brand__coord {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--stone);
  white-space: nowrap;
}
.brand__link:hover .brand__name { color: var(--aurora); }

/* 中部坐标轴 */
.header-axis {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 1 1 auto;
  min-width: 0;
  padding-block: 22px;
}
.header-axis__ticks {
  flex: 1 1 auto;
  height: 10px;
  min-width: 40px;
  border-bottom: 1px solid var(--rule-dark-2);
  background-image: repeating-linear-gradient(90deg, rgba(199, 208, 216, .5) 0 1px, transparent 1px 12px);
  background-position: bottom left;
  background-size: 12px 6px;
  background-repeat: repeat-x;
}
.header-axis__readout {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--stone);
  white-space: nowrap;
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.4vw, 20px);
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(2px, .9vw, 14px);
}
.site-nav__item { display: flex; }
.site-nav__link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding: 14px 8px 16px;
  color: var(--silver);
  transition: color .2s ease;
}
.site-nav__code {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--stone);
  transition: color .2s ease;
}
.site-nav__label {
  font-size: var(--step-2);
  letter-spacing: .1em;
  font-weight: 500;
  white-space: nowrap;
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 8px; right: 8px; bottom: 9px;
  height: 1px;
  background: var(--aurora);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .24s ease;
}
.site-nav__link:hover { color: #FFFFFF; }
.site-nav__link:hover .site-nav__code { color: var(--aurora); }
.site-nav__link:hover::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] { color: #FFFFFF; }
.site-nav__link[aria-current="page"] .site-nav__code { color: var(--coral); }
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); background: var(--coral); }
.site-nav__cta { margin-left: clamp(4px, 1vw, 16px); white-space: nowrap; }

/* 移动开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  align-self: center;
  padding: 10px 13px;
  border: 1px solid var(--rule-dark-2);
  border-radius: var(--radius);
  color: var(--paper);
  transition: border-color .2s ease, color .2s ease;
}
.nav-toggle:hover { border-color: var(--aurora); color: var(--aurora); }
.nav-toggle__bars { position: relative; width: 18px; height: 12px; }
.nav-toggle__bars::before, .nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 1px;
  background: currentColor;
  transition: transform .2s ease, top .2s ease, bottom .2s ease;
}
.nav-toggle__bars::before { top: 2px; }
.nav-toggle__bars::after { bottom: 2px; }
.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 50%; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { bottom: auto; top: 50%; transform: rotate(-45deg); }

/* 滚动进度 */
.site-header__progress {
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  background: rgba(199, 208, 216, .12);
  overflow: hidden;
}
.site-header__progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--aurora), var(--coral));
  transition: width .12s linear;
}

/* ---------- 06 站点页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--midnight);
  color: var(--silver);
  border-top: 1px solid var(--rule-dark);
}
.site-footer::before {
  content: "";
  display: block;
  height: 7px;
  background-image: repeating-linear-gradient(90deg, rgba(199, 208, 216, .34) 0 1px, transparent 1px 16px);
  border-bottom: 1px solid var(--rule-dark);
}
.site-footer__inner {
  width: min(1480px, 100%);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 84px) var(--pad) 26px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--rule-dark);
}
.footer-col { display: flex; flex-direction: column; gap: 16px; }
.brand--footer { align-items: center; }
.brand--footer .brand__name { color: var(--paper); }
.brand--footer:hover .brand__name { color: var(--aurora); }
.footer-note {
  font-size: var(--step-2);
  line-height: 1.8;
  color: var(--silver);
  max-width: 34ch;
}
.footer-col__title {
  padding-top: 12px;
  border-top: 1px solid var(--rule-dark-2);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--stone);
}
.footer-list { display: grid; gap: 10px; }
.footer-link {
  position: relative;
  display: inline-block;
  padding-left: 14px;
  font-size: var(--step-2);
  letter-spacing: .06em;
  color: var(--silver);
  transition: color .2s ease;
}
.footer-link::before {
  content: "";
  position: absolute;
  left: 0; top: .72em;
  width: 7px; height: 1px;
  background: var(--stone);
  transition: background-color .2s ease, width .2s ease;
}
.footer-link:hover { color: var(--aurora); }
.footer-link:hover::before { background: var(--aurora); width: 10px; }

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px clamp(20px, 3vw, 40px);
  padding-block: clamp(24px, 3vw, 36px);
  border-bottom: 1px solid var(--rule-dark);
}
.footer-contact__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
}
.footer-contact__item--wide { grid-column: span 2; }
.footer-contact__label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--stone);
}
.footer-contact__value {
  font-size: var(--step-2);
  letter-spacing: .04em;
  color: var(--paper);
  word-break: break-word;
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px clamp(18px, 3vw, 40px);
  padding-top: 22px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--stone);
}
.footer-legal__icp { color: var(--silver); }
.footer-legal__coord { margin-left: auto; color: rgba(199, 208, 216, .55); }

/* ---------- 07 响应式 ---------- */
@media (max-width: 1180px) {
  .header-axis__readout { display: none; }
  .site-nav__label { font-size: 13px; }
}

@media (max-width: 1080px) {
  .header-axis { display: none; }
  .nav-toggle { display: inline-flex; }
  .site-header__inner { justify-content: space-between; }
  .site-nav {
    position: absolute;
    left: 0; right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px var(--pad) 22px;
    background: var(--midnight);
    border-bottom: 1px solid var(--rule-dark-2);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }
  .site-nav[data-open] { display: flex; }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav__item { display: block; }
  .site-nav__link {
    flex-direction: row;
    align-items: baseline;
    gap: 14px;
    padding: 14px 2px;
    border-bottom: 1px solid var(--rule-dark);
  }
  .site-nav__label { font-size: var(--step-2); }
  .site-nav__link::after { display: none; }
  .site-nav__link:hover .site-nav__label { color: var(--aurora); }
  .site-nav__link[aria-current="page"] .site-nav__label { color: var(--coral); }
  .site-nav__cta { align-self: flex-start; margin: 18px 0 0; }
}

@media (max-width: 1000px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-contact__item--wide { grid-column: span 2; }
}

@media (max-width: 900px) {
  .grid--cols-3, .grid--cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .section-head__note { margin-left: 0; max-width: none; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .grid--cols-2, .grid--cols-3, .grid--cols-4 { grid-template-columns: minmax(0, 1fr); }
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-contact__item--wide { grid-column: span 1; }
  .footer-legal__coord { margin-left: 0; }
  .brand__coord { display: none; }
  .sheet--stack {
    box-shadow:
      4px 4px 0 -1px rgba(199, 208, 216, .6),
      8px 8px 0 -2px rgba(199, 208, 216, .3);
  }
}

/* 动效降级 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .has-js [data-reveal] { opacity: 1; transform: none; }
  .site-header__progress span { transition: none; }
}