:root {
  --color-surface: #fbfbfb;
  --color-surface-alt: #f1f1f1;
  --color-surface-deep: #e4e3e3;
  --color-ink: #3a3136;
  --color-ink-soft: #6a5c65;
  --color-ink-muted: #877881;
  --color-line: #d8d7d8;
  --color-primary: #da1a8c;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #f6dceb;
  --color-accent: #128736;
  --color-accent-ink: #ffffff;
  --color-highlight: #d1e6d8;
  --color-focus: #0a852f;
  --color-contrast-surface: #21101a;
  --color-contrast-ink: #e7e4e6;
  --color-contrast-line: #4d3f47;
  --color-contrast-accent: #1ee159;
  --overlay-scrim: linear-gradient(180deg, rgba(33, 16, 26, 0.35) 0%, rgba(33, 16, 26, 0.72) 55%, rgba(33, 16, 26, 0.92) 100%);
  --font-heading: "Source Han Sans SC", "Noto Sans SC", SimHei, "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-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(48px, 9.9vw, 127px);
  --text-figure: clamp(40px, 7.1vw, 91px);
  --weight-heading: 785;
  --weight-body: 400;
  --leading-body: 1.7;
  --leading-heading: 1.23;
  --tracking-heading: -0.004em;
  --radius-sm: 0px;
  --radius-md: 0px;
  --radius-lg: 0px;
  --radius-pill: 0px;
  --border-thin: 1px;
  --border-thick: 2px;
  --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: 1240px;
  --measure: 71ch;
  --gutter: 32px;
  --section-y: 75px;
  --section-y-lg: 105px;
}

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

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

body {
  margin: 0;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img, svg, video, canvas { display: block; max-width: 100%; height: auto; }
figure { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
table { border-collapse: collapse; width: 100%; }
main { display: block; }

/* ============================================================
   2. 中文排版与标题
   ============================================================ */
h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  text-wrap: balance;
}

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

p:last-child { margin-bottom: 0; }

strong, b { font-weight: 700; }

hr {
  border: 0;
  border-top: var(--border-thin) solid var(--color-line);
  margin: 0;
}

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

.site-header :focus-visible,
.site-footer :focus-visible,
.section--dark :focus-visible,
.section--primary :focus-visible,
.section--accent :focus-visible {
  outline-color: var(--color-contrast-accent);
}

#main-content { scroll-margin-top: calc(var(--space-8) + var(--space-4)); }

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

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--flush { padding-block: 0; }

.section--surface { background: var(--color-surface); color: var(--color-ink); }
.section--alt { background: var(--color-surface-alt); color: var(--color-ink); }
.section--deep { background: var(--color-surface-deep); color: var(--color-ink); }
.section--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.section--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.section--dark { background: var(--color-contrast-surface); color: var(--color-contrast-ink); }

.section--dark hr,
.section--dark .rule { border-color: var(--color-contrast-line); }
.section--primary hr,
.section--primary .rule { border-color: color-mix(in srgb, var(--color-primary-ink) 32%, transparent); }

.rule {
  display: block;
  height: 0;
  border-top: var(--border-thin) solid var(--color-line);
  margin: 0;
}

.grid-10 {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: var(--gutter);
}

@media (max-width: 1099px) {
  .grid-10 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 719px) {
  .container { padding-inline: calc(var(--gutter) * 0.625); }
  .grid-10 { grid-template-columns: minmax(0, 1fr); }
  .grid-10 > * { grid-column: 1 / -1; }
}

/* ============================================================
   4. 通用组件
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 12px 22px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  line-height: 1.2;
  text-align: center;
  transition: background-color 160ms cubic-bezier(.2,.7,.2,1),
              color 160ms cubic-bezier(.2,.7,.2,1),
              border-color 160ms cubic-bezier(.2,.7,.2,1);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background: color-mix(in srgb, var(--color-primary) 82%, var(--color-contrast-surface));
}

.btn--accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  border-color: var(--color-accent);
}

.btn--accent:hover {
  background: color-mix(in srgb, var(--color-accent) 80%, var(--color-contrast-surface));
}

.btn--ghost {
  background: transparent;
  color: inherit;
  border-color: currentColor;
}

.btn--ghost:hover {
  background: color-mix(in srgb, currentColor 16%, transparent);
}

.btn--block { width: 100%; }

.num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: -0.01em;
}

.mark {
  background-image: linear-gradient(var(--color-highlight), var(--color-highlight));
  background-repeat: no-repeat;
  background-size: 100% 38%;
  background-position: 0 88%;
  padding-inline: 0.12em;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.section--dark .mark,
.site-footer .mark,
.site-header .mark {
  background-image: linear-gradient(
    color-mix(in srgb, var(--color-contrast-accent) 34%, transparent),
    color-mix(in srgb, var(--color-contrast-accent) 34%, transparent)
  );
}

.section--primary .mark {
  background-image: linear-gradient(
    color-mix(in srgb, var(--color-primary-ink) 30%, transparent),
    color-mix(in srgb, var(--color-primary-ink) 30%, transparent)
  );
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.4;
}

.tag--accent { background: var(--color-highlight); color: var(--color-accent); }
.tag--dark { background: var(--color-contrast-surface); color: var(--color-contrast-accent); }
.tag--outline {
  background: transparent;
  color: inherit;
  border: var(--border-thin) solid currentColor;
}

.panel {
  background: var(--color-surface-alt);
  border-top: var(--border-thick) solid var(--color-primary);
  padding: var(--space-4);
}

.section--dark .panel {
  background: color-mix(in srgb, var(--color-contrast-ink) 6%, transparent);
  border-top-color: var(--color-contrast-accent);
}

.echo-bar {
  display: block;
  width: 100%;
  height: 26px;
  color: var(--color-primary);
  background-image: repeating-linear-gradient(
    90deg,
    currentColor 0 1px,
    transparent 1px 11px
  );
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 100%);
  opacity: 0.7;
}

.section--dark .echo-bar { color: var(--color-contrast-accent); opacity: 0.55; }
.section--accent .echo-bar { color: var(--color-accent-ink); opacity: 0.5; }

.breadcrumb {
  padding-block: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.breadcrumb__list li:not(:last-child)::after {
  content: "/";
  margin-inline: 10px;
  color: var(--color-line);
}

.breadcrumb__list a:hover { color: var(--color-primary); }
.breadcrumb__list [aria-current="page"] { color: var(--color-ink); font-weight: 600; }

.page-head {
  padding-block: var(--section-y) var(--space-6);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-head__title { font-size: var(--text-3xl); }
.page-head__lede {
  margin-top: var(--space-3);
  font-size: var(--text-lg);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

/* 主题筛选 */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
}

.filter-btn {
  display: inline-flex;
  align-items: center;
  padding: 11px 18px;
  border-right: var(--border-thin) solid var(--color-line);
  background: transparent;
  color: var(--color-ink-soft);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  line-height: 1.2;
  transition: background-color 160ms cubic-bezier(.2,.7,.2,1),
              color 160ms cubic-bezier(.2,.7,.2,1);
}

.filter-btn:last-child { border-right: 0; }
.filter-btn:hover { background: var(--color-primary-soft); color: var(--color-primary); }

.filter-btn[aria-pressed="true"] {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.filter-btn__count {
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
  opacity: 0.72;
}

[data-filter-item][hidden] { display: none !important; }

/* 图片容器 */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-surface-deep);
  isolation: isolate;
}

.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--wide { aspect-ratio: 21 / 9; }

.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.06);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(
    160deg,
    color-mix(in srgb, var(--color-primary) 72%, transparent) 0%,
    color-mix(in srgb, var(--color-accent) 68%, transparent) 100%
  );
  mix-blend-mode: multiply;
  opacity: 0.78;
}

.media-frame__caption {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 2;
  padding: var(--space-3);
  background: var(--overlay-scrim);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  line-height: 1.5;
}

.media-frame__caption .num { color: var(--color-contrast-accent); }

/* 显现动效 */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 320ms cubic-bezier(.2,.7,.2,1),
              transform 320ms cubic-bezier(.2,.7,.2,1);
}

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

/* ============================================================
   5. 跳转链接
   ============================================================ */
.skip-link {
  position: fixed;
  top: -120px;
  left: var(--space-2);
  z-index: 300;
  padding: 10px 20px;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  transition: top 160ms cubic-bezier(.2,.7,.2,1);
}

.skip-link:focus {
  top: var(--space-2);
}

/* ============================================================
   6. 头部
   ============================================================ */
.site-header {
  --header-h: 78px;
  position: sticky;
  top: 0;
  z-index: 120;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.site-header__frame {
  width: 100%;
  max-width: var(--container);
  min-height: var(--header-h);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  grid-template-columns: auto minmax(180px, 330px) 1fr auto;
  align-items: center;
  gap: var(--space-4);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: var(--text-lg);
  line-height: 1;
  letter-spacing: -0.04em;
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--text-base);
  line-height: 1.15;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.brand__line {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.2;
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
  white-space: nowrap;
}

/* 检索入口 */
.search-gate {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
  height: 44px;
  padding-inline: var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  background: color-mix(in srgb, var(--color-contrast-ink) 7%, transparent);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  transition: border-color 160ms cubic-bezier(.2,.7,.2,1),
              background-color 160ms cubic-bezier(.2,.7,.2,1);
}

.search-gate:hover {
  border-color: var(--color-contrast-accent);
  background: color-mix(in srgb, var(--color-contrast-accent) 13%, transparent);
}

.search-gate__icon {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  border: var(--border-thick) solid var(--color-contrast-accent);
  border-radius: 50%;
}

.search-gate__icon::after {
  content: "";
  position: absolute;
  left: 10px;
  top: 10px;
  width: 8px;
  height: var(--border-thick);
  background: var(--color-contrast-accent);
  transform: rotate(45deg);
  transform-origin: 0 0;
}

.search-gate__label {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

.search-gate__hint {
  flex: 0 0 auto;
  padding: 3px 8px;
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-2);
  height: 44px;
  padding-inline: var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  transition: border-color 160ms cubic-bezier(.2,.7,.2,1);
}

.nav-toggle:hover { border-color: var(--color-contrast-accent); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 20px;
  height: 14px;
  flex: 0 0 auto;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: var(--border-thick);
  background: var(--color-contrast-accent);
  transition: top 200ms cubic-bezier(.2,.7,.2,1),
              transform 200ms cubic-bezier(.2,.7,.2,1);
}

.nav-toggle__bars::before { top: 1px; }
.nav-toggle__bars::after { top: 11px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 6px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  top: 6px;
  transform: rotate(-45deg);
}

/* 主导航：成为页面视觉边框的一部分 */
.primary-nav {
  display: flex;
  align-items: stretch;
  justify-content: flex-end;
  min-width: 0;
}

.primary-nav__list {
  display: flex;
  align-items: stretch;
  min-width: 0;
}

.primary-nav__list li { display: flex; }

.primary-nav__list a {
  display: flex;
  align-items: center;
  height: 100%;
  padding-inline: 12px;
  border-left: var(--border-thin) solid var(--color-contrast-line);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  line-height: 1.2;
  white-space: nowrap;
  transition: background-color 160ms cubic-bezier(.2,.7,.2,1),
              color 160ms cubic-bezier(.2,.7,.2,1);
}

.primary-nav__list li:last-child a {
  border-right: var(--border-thin) solid var(--color-contrast-line);
}

.primary-nav__list a:hover {
  background: color-mix(in srgb, var(--color-contrast-accent) 16%, transparent);
  color: var(--color-contrast-ink);
}

.primary-nav__list a[aria-current="page"] {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-left-color: var(--color-primary);
}

.primary-nav__list li:last-child a[aria-current="page"] {
  border-right-color: var(--color-primary);
}

.primary-nav__actions { display: none; }

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: var(--border-thick);
  background: var(--color-contrast-accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* ============================================================
   7. 页脚
   ============================================================ */
.site-footer {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  padding-block: var(--section-y-lg) var(--space-6);
}

.site-footer__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr) minmax(0, 1fr);
  gap: var(--space-6);
  padding-bottom: var(--space-8);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.site-footer__brand {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: var(--text-xl);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.site-footer__kicker {
  margin: 0 0 var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-accent);
  max-width: none;
}

.site-footer__note {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
  max-width: 32ch;
}

.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-left: var(--border-thin) solid var(--color-contrast-line);
}

.footer-col {
  padding: 0 var(--space-3);
  min-width: 0;
}

.footer-col + .footer-col {
  border-left: var(--border-thin) solid var(--color-contrast-line);
}

.footer-col__title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-accent);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.footer-col a {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid transparent;
  font-size: var(--text-sm);
  line-height: 1.5;
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
  transition: color 160ms cubic-bezier(.2,.7,.2,1),
              border-color 160ms cubic-bezier(.2,.7,.2,1);
}

.footer-col a:hover {
  color: var(--color-contrast-ink);
  border-bottom-color: var(--color-contrast-accent);
}

.site-footer__contact {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: var(--border-thick) solid var(--color-primary);
}

.footer-contact__row {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin: 0;
  padding-block: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  max-width: none;
}

.footer-contact__row--last { border-bottom: 0; padding-bottom: 0; }

.footer-contact__k {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-contrast-ink) 52%, transparent);
}

.footer-contact__v {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.45;
  color: var(--color-contrast-ink);
  overflow-wrap: anywhere;
}

.footer-contact__v--plain {
  font-family: var(--font-body);
  font-weight: 400;
}

.site-footer__display {
  margin: var(--space-8) 0 0;
  max-width: none;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(var(--text-2xl), 8.4vw, calc(var(--text-4xl) * 1.24));
  line-height: 0.94;
  letter-spacing: -0.03em;
  color: var(--color-contrast-ink);
  word-break: keep-all;
}

.site-footer__accent { color: var(--color-contrast-accent); }

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}

.site-footer__legal-item { margin: 0; max-width: none; }

.site-footer__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.site-footer__legal-links a {
  color: inherit;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 160ms cubic-bezier(.2,.7,.2,1),
              border-color 160ms cubic-bezier(.2,.7,.2,1);
}

.site-footer__legal-links a:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}

/* ============================================================
   8. 响应式
   ============================================================ */
@media (max-width: 1180px) {
  .site-header { --header-h: 64px; }

  .site-header__frame {
    grid-template-columns: 1fr auto auto;
    gap: var(--space-2);
    align-items: center;
  }

  .brand__mark { width: 36px; height: 36px; font-size: var(--text-base); }
  .brand__line { display: none; }

  .search-gate {
    width: 40px;
    height: 40px;
    padding: 0;
    justify-content: center;
  }

  .search-gate__label,
  .search-gate__hint { display: none; }

  .nav-toggle { display: inline-flex; height: 40px; padding-inline: var(--space-2); }
  .nav-toggle__text { display: none; }

  .primary-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 110;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: var(--space-4) var(--space-4) var(--space-8);
    overflow-y: auto;
    background: var(--color-contrast-surface);
    border-top: var(--border-thin) solid var(--color-contrast-line);
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 280ms cubic-bezier(.2,.7,.2,1),
                visibility 280ms cubic-bezier(.2,.7,.2,1);
  }

  .primary-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
  }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    border-top: var(--border-thin) solid var(--color-contrast-line);
  }

  .primary-nav__list li { display: block; }

  .primary-nav__list a {
    height: auto;
    padding: var(--space-3) 0;
    border-left: 0;
    border-bottom: var(--border-thin) solid var(--color-contrast-line);
    font-size: var(--text-lg);
  }

  .primary-nav__list li:last-child a { border-right: 0; }

  .primary-nav__list a[aria-current="page"] {
    padding-inline: var(--space-2);
    border-left: var(--border-thick) solid var(--color-primary);
  }

  .primary-nav__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    padding-top: var(--space-4);
  }

  body.nav-open { overflow: hidden; }

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

  .site-footer__ident { grid-column: 1 / -1; }
  .site-footer__note { max-width: var(--measure); }

  .site-footer__display { font-size: clamp(var(--text-2xl), 11vw, calc(var(--text-4xl) * 1.1)); }
}

@media (max-width: 860px) {
  .site-footer__body {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-4);
  }

  .site-footer__nav {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-left: 0;
    border-top: var(--border-thin) solid var(--color-contrast-line);
    padding-top: var(--space-3);
    gap: var(--space-3);
  }

  .footer-col { padding: 0; }

  .footer-col + .footer-col {
    border-left: 0;
    padding-left: var(--space-3);
  }
}

@media (max-width: 719px) {
  .site-footer { padding-block: var(--section-y) var(--space-4); }

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

  .footer-col + .footer-col {
    border-left: 0;
    border-top: var(--border-thin) solid var(--color-contrast-line);
    padding-left: 0;
    margin-top: var(--space-3);
    padding-top: var(--space-3);
  }

  .site-footer__legal { flex-direction: column; align-items: flex-start; }

  .primary-nav { padding-inline: var(--space-3); }
}

/* ============================================================
   9. 动效偏好
   ============================================================ */
@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;
  }

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