:root {
  --color-surface: #f5f5f5;
  --color-surface-alt: #edecec;
  --color-surface-deep: #e1e0df;
  --color-ink: #4d4341;
  --color-ink-soft: #766866;
  --color-ink-muted: #887a77;
  --color-line: #d7d5d5;
  --color-primary: #d0462f;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #f0dcd9;
  --color-accent: #da3b20;
  --color-accent-ink: #ffffff;
  --color-highlight: #f0d4cf;
  --color-focus: #cf2d11;
  --color-contrast-surface: #231613;
  --color-contrast-ink: #e7e5e4;
  --color-contrast-line: #4e4441;
  --color-contrast-accent: #e25037;
  --overlay-scrim: linear-gradient(180deg, rgba(35, 22, 19, 0.35) 0%, rgba(35, 22, 19, 0.72) 55%, rgba(35, 22, 19, 0.92) 100%);
  --font-heading: "Kaiti SC", STKaiti, KaiTi, "Songti SC", serif;
  --font-body: "Songti SC", "PingFang SC", "Microsoft YaHei", serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 11.0px;
  --text-sm: 14.7px;
  --text-base: 17px;
  --text-lg: 22.7px;
  --text-xl: 30.2px;
  --text-2xl: 40.3px;
  --text-3xl: 53.7px;
  --text-4xl: 71.5px;
  --text-display: clamp(34px, 6.6vw, 85px);
  --text-figure: clamp(28px, 4.8vw, 61px);
  --weight-heading: 535;
  --weight-body: 400;
  --leading-body: 1.98;
  --leading-heading: 1.26;
  --tracking-heading: 0.027em;
  --radius-sm: 1px;
  --radius-md: 2px;
  --radius-lg: 2px;
  --radius-pill: 2px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: none;
  --shadow-2: none;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1080px;
  --measure: 62ch;
  --gutter: 32px;
  --section-y: 127px;
  --section-y-lg: 178px;
}

/* ============ 派生令牌与重置 ============ */
html {
  --header-h: 68px;
  --paper-fiber: color-mix(in srgb, var(--color-line) 24%, transparent);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
@media (min-width: 900px) {
  html { --header-h: 112px; }
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  color: var(--color-ink);
  background-color: var(--color-surface);
  background-image:
    radial-gradient(120% 60% at 12% 0%, color-mix(in srgb, var(--color-surface-alt) 88%, transparent) 0%, transparent 58%),
    radial-gradient(90% 50% at 92% 100%, color-mix(in srgb, var(--color-surface-deep) 70%, transparent) 0%, transparent 60%),
    repeating-linear-gradient(0deg, var(--paper-fiber) 0 1px, transparent 1px 7px);
  background-attachment: fixed;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  margin: 0 0 var(--space-3);
  color: inherit;
}
h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

p { margin: 0 0 var(--space-3); }
p:last-child { margin-bottom: 0; }

a { color: inherit; text-decoration: none; }
a:hover { color: var(--color-primary); }

img, svg, video { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }
.prose ul, .prose ol { padding-left: 1.4em; margin-bottom: var(--space-3); }
.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: var(--space-1); }

::selection { background: var(--color-primary-soft); color: var(--color-ink); }

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ============ 布局原语 ============ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.measure { max-width: var(--measure); }

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section:first-child { padding-top: var(--space-6); }

.band-alt { background-color: var(--color-surface-alt); }
.band-deep { background-color: var(--color-surface-deep); }

.data-band {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: var(--section-y);
}
.data-band a:hover { color: var(--color-contrast-accent); }
.data-band .lede,
.data-band .source-note,
.data-band .section-note { color: color-mix(in srgb, var(--color-contrast-ink) 72%, var(--color-contrast-surface)); }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

.stack { display: grid; gap: var(--space-3); }
.stack--tight { display: grid; gap: var(--space-2); }

.main-offset { padding-top: var(--header-h); }
.hero-offset { padding-top: calc(var(--header-h) + var(--space-6)); }

/* ============ 标题组与刻度分隔 ============ */
.section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  column-gap: var(--space-3);
  row-gap: var(--space-1);
  margin-bottom: var(--space-6);
}
.section-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-primary);
}
.section-title { margin: 0; font-size: var(--text-2xl); }
.section-note {
  grid-column: 2 / -1;
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.rule-scale {
  display: block;
  height: 10px;
  border: 0;
  background-image: repeating-linear-gradient(to right, var(--color-line) 0 1px, transparent 1px 9px);
  background-size: 100% 6px;
  background-position: left bottom;
  background-repeat: repeat-x;
  opacity: 0.9;
}
.rule-scale--ink {
  background-image: repeating-linear-gradient(to right, var(--color-contrast-line) 0 1px, transparent 1px 9px);
}

.index-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}
.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.figure-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-primary);
  display: block;
}
.figure-num--accent { color: var(--color-accent); }
.figure-num--muted { color: var(--color-ink-muted); }
.figure-num--contrast { color: var(--color-contrast-ink); }
.figure-num--contrast-accent { color: var(--color-contrast-accent); }

.lede {
  font-size: var(--text-lg);
  line-height: 1.72;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.source-note {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--color-line);
  letter-spacing: 0.04em;
}

.term {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-primary-soft);
  padding-bottom: 2px;
}

/* ============ 按钮与标签 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  line-height: 1.2;
  background: transparent;
  color: var(--color-ink);
  transition: background-color 0.22s ease, color 0.22s ease, border-color 0.22s ease;
}
.btn--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background: var(--color-accent); color: var(--color-primary-ink); }
.btn--ghost { border-color: var(--color-line); color: var(--color-ink); }
.btn--ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn--line {
  padding: 4px 0;
  border: 0;
  border-bottom: 1px solid var(--color-primary);
  border-radius: 0;
  color: var(--color-primary);
}
.btn--line:hover { color: var(--color-accent); border-bottom-color: var(--color-accent); }
.btn--contrast { border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }
.btn--contrast:hover { border-color: var(--color-contrast-accent); color: var(--color-contrast-accent); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
}
.tag--primary { background: var(--color-primary-soft); color: var(--color-primary); }
.data-band .tag { background: color-mix(in srgb, var(--color-contrast-line) 60%, transparent); color: var(--color-contrast-ink); }

/* ============ 专题研究板 ============ */
.plate {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
}
.plate--deep { background: var(--color-surface-deep); }
.plate--ink { background: var(--color-contrast-surface); color: var(--color-contrast-ink); }
.plate-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
}
.plate-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}
.plate--ink .plate-index { color: var(--color-contrast-accent); }
.plate-title { margin: 0; font-size: var(--text-lg); }
.plate-body {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.86;
  color: var(--color-ink-soft);
}
.plate--ink .plate-body { color: color-mix(in srgb, var(--color-contrast-ink) 78%, var(--color-contrast-surface)); }

/* ============ 面包屑 ============ */
.breadcrumbs {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}
.breadcrumbs ol { display: flex; flex-wrap: wrap; align-items: center; }
.breadcrumbs li { display: inline-flex; align-items: center; }
.breadcrumbs li + li::before {
  content: "／";
  margin: 0 var(--space-2);
  color: var(--color-line);
}
.breadcrumbs a:hover { color: var(--color-primary); }
.breadcrumbs [aria-current="page"] { color: var(--color-ink); }

/* ============ 标签页 ============ */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  padding-bottom: var(--space-2);
  background-image: repeating-linear-gradient(to right, var(--color-line) 0 1px, transparent 1px 9px);
  background-size: 100% 5px;
  background-position: left bottom;
  background-repeat: repeat-x;
}
.tab {
  padding: 9px 16px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  transition: background-color 0.2s ease, color 0.2s ease;
}
.tab:hover { color: var(--color-primary); }
.tab[aria-selected="true"] {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.tab-panel { padding-top: var(--space-4); }
.tab-panel[hidden] { display: none; }

/* ============ 图片容器（去边直角） ============ */
.img-frame {
  position: relative;
  overflow: hidden;
  border-radius: 0;
  background-color: var(--color-surface-deep);
  aspect-ratio: 16 / 9;
}
.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.img-frame--tall { aspect-ratio: 4 / 5; }
.img-frame--wide { aspect-ratio: 21 / 9; }
.img-frame__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}
.img-frame__caption {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 1;
  margin: 0;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.6;
}

/* ============ 头部 ============ */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 90;
  padding: 10px 16px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  transform: translateY(-160%);
  transition: transform 0.2s ease;
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  background-color: var(--color-surface);
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-line);
  transition: background-color 0.28s ease, color 0.28s ease, border-color 0.28s ease;
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--overlay-scrim);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

body[data-hero-dark] .site-header[data-transparent="true"]:not([data-scrolled="true"]):not([data-nav-open="true"]) {
  background-color: transparent;
  color: var(--color-contrast-ink);
  border-bottom-color: transparent;
}
body[data-hero-dark] .site-header[data-transparent="true"]:not([data-scrolled="true"]):not([data-nav-open="true"])::before { opacity: 1; }
body[data-hero-dark] .site-header[data-transparent="true"]:not([data-scrolled="true"]):not([data-nav-open="true"]) .brand-tag { color: color-mix(in srgb, var(--color-contrast-ink) 66%, var(--color-contrast-surface)); }
body[data-hero-dark] .site-header[data-transparent="true"]:not([data-scrolled="true"]):not([data-nav-open="true"]) .nav-toggle { border-color: color-mix(in srgb, var(--color-contrast-ink) 36%, transparent); }
body[data-hero-dark] .site-header[data-transparent="true"]:not([data-scrolled="true"]):not([data-nav-open="true"]) .utility-link,
body[data-hero-dark] .site-header[data-transparent="true"]:not([data-scrolled="true"]):not([data-nav-open="true"]) .search-hint { color: color-mix(in srgb, var(--color-contrast-ink) 78%, var(--color-contrast-surface)); }
body[data-hero-dark] .site-header[data-transparent="true"]:not([data-scrolled="true"]):not([data-nav-open="true"]) .utility-index { color: var(--color-contrast-accent); }
body[data-hero-dark] .site-header[data-transparent="true"]:not([data-scrolled="true"]):not([data-nav-open="true"]) .nav-link[aria-current="page"] { color: var(--color-contrast-accent); }

.site-header[data-nav-open="true"] {
  background-color: var(--color-surface);
  color: var(--color-ink);
  border-bottom-color: var(--color-line);
}
.site-header[data-nav-open="true"]::before { opacity: 0; }

.header-inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  column-gap: var(--space-6);
  padding-block: var(--space-2);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: inherit;
}
.brand:hover { color: inherit; }
.brand-mark,
.footer-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1;
}
.brand-text { display: block; }
.brand-line {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  line-height: 1.3;
}
.brand-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  justify-self: end;
  padding: 9px 12px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  background: transparent;
  color: inherit;
}
.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: background-color 0.2s ease;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: transform 0.2s ease, top 0.2s ease;
}
.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { top: 0; transform: rotate(-45deg); }

.site-nav {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-1) var(--space-4);
  color: inherit;
}
.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
}
.nav-link {
  position: relative;
  display: inline-block;
  padding: 5px 1px;
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: inherit;
  transition: color 0.2s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s ease;
}
.nav-link:hover::after,
.nav-link[aria-current="page"]::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--color-primary); }

.header-utility { display: flex; align-items: center; gap: var(--space-3); }
.utility-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-soft);
}
.utility-link:hover {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.utility-index { color: var(--color-primary); }

.search-hint {
  grid-column: 1 / -1;
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.search-hint-text {
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--color-line);
}
.search-hint-key {
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
}
.search-hint:hover { color: var(--color-ink); }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 0;
  background: var(--color-primary);
  opacity: 0;
  transition: opacity 0.2s ease;
}
.scroll-progress[data-visible="true"] { opacity: 1; }

body[data-nav-locked="true"] { overflow: hidden; }

/* ============ 页脚 ============ */
.site-footer {
  margin-top: var(--section-y);
  padding-block: var(--section-y) var(--space-6);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.site-footer a:hover { color: var(--color-contrast-accent); }

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: var(--space-8);
}
.footer-brand { display: grid; gap: var(--space-2); justify-items: start; }
.footer-brand-line {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}
.footer-tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-contrast-accent);
}
.footer-note {
  margin: 0;
  max-width: 36ch;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, var(--color-contrast-surface));
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}
.footer-col-title {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin: 0 0 var(--space-3);
  padding-bottom: var(--space-2);
  font-size: var(--text-base);
  background-image: repeating-linear-gradient(to right, var(--color-contrast-line) 0 1px, transparent 1px 9px);
  background-size: 100% 5px;
  background-position: left bottom;
  background-repeat: repeat-x;
}
.footer-col-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-accent);
}
.footer-links { display: grid; gap: var(--space-2); }
.footer-link {
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, var(--color-contrast-surface));
}

.footer-bottom {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: var(--space-4);
  margin-top: var(--space-8);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-contrast-line);
}
.footer-meta { display: grid; gap: 4px; }
.footer-meta .footer-note { max-width: none; }
.footer-contact,
.footer-address {
  margin: 0;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, var(--color-contrast-surface));
}
.footer-address { letter-spacing: 0.06em; }
.footer-sign { display: grid; gap: 6px; justify-items: end; text-align: right; }
.footer-legal,
.footer-copy {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 64%, var(--color-contrast-surface));
}
.to-top {
  margin-top: var(--space-1);
  padding: 8px 14px;
  border: 1px solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-ink);
  background: transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.to-top:hover { border-color: var(--color-contrast-accent); color: var(--color-contrast-accent); }

/* ============ 显现动效 ============ */
html[data-js="true"] [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
html[data-js="true"] [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

/* ============ 响应式 ============ */
@media (max-width: 1080px) {
  .header-inner { column-gap: var(--space-4); }
  .nav-list { gap: var(--space-2); }
}

@media (max-width: 899px) {
  .header-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    position: relative;
    z-index: 56;
  }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 55;
    grid-template-columns: minmax(0, 1fr);
    align-content: start;
    gap: var(--space-4);
    padding: calc(var(--header-h) + var(--space-4)) var(--gutter) var(--space-8);
    background-color: var(--color-surface);
    color: var(--color-ink);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity 0.24s ease, transform 0.24s ease, visibility 0.24s;
  }
  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
  }
  .nav-link {
    display: block;
    padding: var(--space-2) 0;
    font-size: var(--text-lg);
    border-bottom: 1px solid var(--color-line);
  }
  .nav-link::after { display: none; }
  .header-utility {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
  .search-hint { justify-self: start; }
  .footer-top { grid-template-columns: minmax(0, 1fr); gap: var(--space-6); }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4) var(--space-3); }
  .footer-bottom { grid-template-columns: minmax(0, 1fr); }
  .footer-sign { justify-items: start; text-align: left; }
}

@media (max-width: 900px) {
  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: var(--space-3) var(--space-3); }
  .col-3, .col-4 { grid-column: span 3; }
  .col-5, .col-6, .col-7, .col-8, .col-12 { grid-column: span 6; }
  .section { padding-block: calc(var(--section-y) * 0.6); }
  .section--lg { padding-block: calc(var(--section-y-lg) * 0.6); }
  .data-band { padding-block: calc(var(--section-y) * 0.6); }
  .site-footer { margin-top: calc(var(--section-y) * 0.6); padding-block: calc(var(--section-y) * 0.6) var(--space-6); }
  .section-head { grid-template-columns: minmax(0, 1fr); }
  .section-note { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  :root { --gutter: 20px; }
  .grid { grid-template-columns: minmax(0, 1fr); }
  .grid > [class*="col-"] { grid-column: 1 / -1; }
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .brand-mark, .footer-mark { width: 32px; height: 32px; font-size: var(--text-base); }
  .plate { padding: var(--space-3); }
}

@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-js="true"] [data-reveal] { opacity: 1; transform: none; }
}