/* ==========================================================================
   321全讯网 · /assets/site.css
   共享外壳样式：reset / 设计令牌 / 中文排版 / 页头 / 页脚 / 基础组件
   ========================================================================== */

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

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

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

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

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

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

button { background: none; border: 0; padding: 0; cursor: pointer; }

a { color: inherit; text-decoration: none; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  --ink: #0A1A2F;
  --panel: #14293F;
  --steel: #274A66;
  --amber: #FF8A1F;
  --cyan: #2FD6E8;
  --indigo: #3A2A6B;
  --burgundy: #6B1F3A;
  --channel: #0E4A46;
  --sand: #F2EDE4;
  --silver: #9DB0C4;
  --green: #3ED598;
  --paper: #EDE7DC;

  --line: rgba(157, 176, 196, .20);
  --line-soft: rgba(157, 176, 196, .11);
  --line-strong: rgba(157, 176, 196, .42);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, .28);
  --shadow: 0 8px 24px rgba(0, 0, 0, .35);

  --font-display: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  --wrap: 1240px;
  --gutter: clamp(18px, 4vw, 44px);
  --radius: 2px;
  --header-h: 96px;
}

/* ---------- 3. 全局排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(880px 520px at 8% -10%, rgba(58, 42, 107, .50), transparent 68%),
    radial-gradient(720px 460px at 96% 2%, rgba(14, 74, 70, .38), transparent 70%);
  background-repeat: no-repeat;
  color: var(--sand);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: .02em;
}

p { text-wrap: pretty; }

main,
#main-content { scroll-margin-top: calc(var(--header-h) + 16px); }

a:not([class]):hover { color: var(--cyan); }

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

:focus:not(:focus-visible) { outline: none; }

/* ---------- 4. 工具类 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.u-display {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  text-transform: uppercase;
  letter-spacing: .14em;
  line-height: 1.06;
}

.mono {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  display: block;
  flex: 0 0 auto;
  width: 22px;
  height: 1px;
  background: var(--amber);
}

.hairline {
  height: 1px;
  border: 0;
  background: var(--line);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 5. 页头 ---------- */
.skip-link {
  position: fixed;
  left: 16px;
  top: -120px;
  z-index: 200;
  padding: 11px 20px;
  background: var(--amber);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: top .2s ease-out;
}

.skip-link:focus,
.skip-link:focus-visible { top: 14px; }

.masthead {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(10, 26, 47, .94);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(39, 74, 102, .45);
  overflow: hidden;
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--amber), var(--cyan));
}

.masthead__inner {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 44px);
  min-height: var(--header-h);
  padding-block: 12px;
}

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

.brand__mark {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  font-size: clamp(19px, 2vw, 25px);
  letter-spacing: .2em;
  line-height: 1.1;
  text-transform: uppercase;
  color: var(--sand);
  transition: color .2s ease-out;
}

.brand__mark:hover { color: var(--cyan); }

.brand__tagline {
  font-size: 11.5px;
  letter-spacing: .3em;
  line-height: 1.4;
  color: var(--amber);
}

.brand__meter {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: .08em;
  line-height: 1.5;
  color: var(--silver);
}

.masthead__field {
  flex: 1 1 auto;
  min-width: 40px;
  height: 54px;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  background-image:
    repeating-linear-gradient(90deg, var(--line-soft) 0 1px, transparent 1px 52px),
    repeating-linear-gradient(0deg, var(--line-soft) 0 1px, transparent 1px 26px),
    radial-gradient(circle at 20% 52%, rgba(47, 214, 232, .16), transparent 44%),
    radial-gradient(circle at 78% 38%, rgba(255, 138, 31, .13), transparent 46%);
}

.masthead__panel {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 30px);
  flex: 0 0 auto;
}

.masthead__utility {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.4vw, 22px);
}

.primary-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 2px;
  font-family: var(--font-display);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--silver);
  transition: color .2s ease-out;
}

.primary-nav__link::before {
  content: attr(data-index);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--steel);
  transition: color .2s ease-out;
}

.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .24s ease-out;
}

.primary-nav__link:hover { color: var(--sand); }
.primary-nav__link:hover::before { color: var(--amber); }
.primary-nav__link:hover::after { transform: scaleX(1); }

.primary-nav__link[aria-current="page"] { color: var(--sand); }
.primary-nav__link[aria-current="page"]::before { color: var(--amber); }
.primary-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--amber);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--sand);
  transition: border-color .2s ease-out, box-shadow .2s ease-out;
}

.nav-toggle:hover { border-color: var(--cyan); box-shadow: var(--shadow-sm); }

.nav-toggle__label {
  font-family: var(--font-display);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .18em;
}

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 1px;
  background: var(--amber);
  transition: transform .22s ease-out, opacity .22s ease-out;
}

.masthead[data-open="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.masthead[data-open="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.masthead[data-open="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  font-family: var(--font-display);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .16em;
  line-height: 1.2;
  white-space: nowrap;
  color: var(--sand);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color .2s ease-out, border-color .2s ease-out, box-shadow .2s ease-out;
}

.btn:hover { box-shadow: var(--shadow-sm); }

.btn--amber { color: var(--amber); border-color: currentColor; }
.btn--amber:hover { color: #FFB061; box-shadow: 0 0 0 1px rgba(255, 138, 31, .5), var(--shadow-sm); }

.btn--cyan { color: var(--cyan); border-color: currentColor; }
.btn--cyan:hover { color: #7EE9F4; box-shadow: 0 0 0 1px rgba(47, 214, 232, .45), var(--shadow-sm); }

.btn--ghost { color: var(--silver); }
.btn--ghost:hover { color: var(--sand); border-color: var(--line-strong); }

.btn--lg { padding: 14px 24px; font-size: 13.5px; letter-spacing: .18em; }

/* ---------- 7. 页脚 ---------- */
.site-footer {
  margin-top: clamp(60px, 8vw, 120px);
  background: var(--panel);
  border-top: 1px solid var(--line);
  color: var(--sand);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1.5fr;
  gap: clamp(26px, 3.5vw, 56px);
  padding-block: clamp(42px, 6vw, 76px);
}

.footer__col { min-width: 0; }

.footer__brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  font-size: 18px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--sand);
}

.footer__lede {
  margin-top: 12px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver);
}

.footer__meta {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--silver);
}

.footer__title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--silver);
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--silver);
  border-bottom: 1px solid transparent;
  transition: color .2s ease-out, border-color .2s ease-out;
}

.footer__link:hover {
  color: var(--cyan);
  border-bottom-color: rgba(47, 214, 232, .55);
}

.footer__link[aria-current="page"] {
  color: var(--sand);
  border-bottom-color: var(--amber);
}

.footer__contact {
  display: flex;
  flex-direction: column;
  gap: 13px;
}

.footer__contact-row {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 12px;
  align-items: baseline;
  font-size: 14px;
}

.footer__contact-key {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--silver);
}

.footer__contact-val {
  color: var(--sand);
  overflow-wrap: break-word;
}

.footer__cta {
  margin-top: 20px;
  align-self: flex-start;
}

.footer__bottom {
  border-top: 1px solid var(--line);
  background: rgba(10, 26, 47, .55);
}

.footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 28px;
  padding-block: 18px;
}

.footer__note {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--silver);
}

/* ---------- 8. 章节与分区 ---------- */
.section { padding-block: clamp(56px, 7vw, 108px); }
.section--tight { padding-block: clamp(36px, 4.5vw, 64px); }

.section--panel {
  background: var(--panel);
  border-block: 1px solid var(--line);
}

.section--indigo {
  background: var(--indigo);
  border-block: 1px solid rgba(242, 237, 228, .14);
}

.section--burgundy {
  background: var(--burgundy);
  border-block: 1px solid rgba(242, 237, 228, .14);
}

.section--channel {
  background: var(--channel);
  border-block: 1px solid rgba(242, 237, 228, .14);
}

.section--paper {
  --ink: #0A1A2F;
  --sand: #0A1A2F;
  --silver: #4A5F76;
  --steel: #7C8FA4;
  --amber: #8C4400;
  --cyan: #0B6577;
  --green: #0E7A55;
  --panel: #FFFFFF;
  --line: rgba(10, 26, 47, .16);
  --line-soft: rgba(10, 26, 47, .08);
  --line-strong: rgba(10, 26, 47, .30);
  --shadow: 0 8px 24px rgba(10, 26, 47, .14);
  --shadow-sm: 0 2px 8px rgba(10, 26, 47, .12);
  background: var(--paper);
  color: #0A1A2F;
}

/* ---------- 9. 面包屑与正文 ---------- */
.breadcrumb { padding-top: 18px; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--silver);
}

.breadcrumb__link {
  color: var(--silver);
  transition: color .2s ease-out;
}

.breadcrumb__link:hover { color: var(--cyan); }

.breadcrumb__sep { color: var(--steel); }

.breadcrumb__current { color: var(--sand); }

.prose {
  max-width: 38rem;
  font-size: 17px;
}

.prose > * + * { margin-top: 1.2em; }

.prose h2 {
  margin-top: 1.9em;
  margin-bottom: .6em;
  font-size: clamp(22px, 2.4vw, 28px);
  font-stretch: condensed;
  letter-spacing: .05em;
}

.prose h3 {
  margin-top: 1.6em;
  font-size: clamp(18px, 1.6vw, 21px);
  letter-spacing: .04em;
}

.prose ul {
  display: flex;
  flex-direction: column;
  gap: .5em;
}

.prose li {
  position: relative;
  padding-left: 1.2em;
}

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .8em;
  width: 6px;
  height: 1px;
  background: var(--amber);
}

.prose a {
  color: var(--cyan);
  border-bottom: 1px solid currentColor;
}

/* ---------- 10. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(18px, 2.4vw, 32px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--aside { grid-template-columns: minmax(0, 7fr) minmax(0, 3fr); }
.grid--aside-rev { grid-template-columns: minmax(0, 3fr) minmax(0, 7fr); }

/* ---------- 11. 面板与卡片 ---------- */
.panel {
  padding: clamp(20px, 2.4vw, 30px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel--flat {
  background: transparent;
  box-shadow: none;
}

.panel--indigo {
  background: var(--indigo);
  border-color: rgba(242, 237, 228, .16);
}

.panel--burgundy {
  background: var(--burgundy);
  border-color: rgba(242, 237, 228, .16);
}

.panel--channel {
  background: var(--channel);
  border-color: rgba(242, 237, 228, .16);
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(18px, 2.2vw, 28px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: border-color .2s ease-out, box-shadow .22s ease-out;
}

.card:hover {
  border-color: rgba(47, 214, 232, .5);
  box-shadow: 0 10px 30px rgba(0, 0, 0, .42);
}

.card__index {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--amber);
}

.card__title {
  font-size: clamp(18px, 1.7vw, 22px);
  font-stretch: condensed;
  letter-spacing: .05em;
}

.card__text {
  font-size: 15px;
  color: var(--silver);
}

/* ---------- 12. 指标与状态 ---------- */
.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
  padding: clamp(18px, 2.4vw, 28px);
  background: rgba(20, 41, 63, .6);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat__value {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1;
  letter-spacing: .02em;
  font-variant-numeric: tabular-nums;
  color: var(--sand);
}

.stat__label {
  font-size: 12.5px;
  letter-spacing: .18em;
  color: var(--silver);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--silver);
  border: 1px solid currentColor;
  border-radius: var(--radius);
}

.badge--green { color: var(--green); }
.badge--amber { color: var(--amber); }
.badge--cyan { color: var(--cyan); }

.badge__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* ---------- 13. 档案列表 ---------- */
.data-list { border-top: 1px solid var(--line); }

.data-list__row {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr) auto;
  gap: clamp(12px, 2vw, 28px);
  align-items: baseline;
  padding: 16px 8px;
  border-bottom: 1px solid var(--line);
  box-shadow: inset 2px 0 0 transparent;
  transition: box-shadow .2s ease-out;
}

.data-list__row:hover { box-shadow: inset 2px 0 0 var(--cyan); }

.data-list__key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--amber);
}

.data-list__val { font-size: 15.5px; }

.data-list__meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--silver);
  white-space: nowrap;
}

/* ---------- 14. 图片容器（供页面阶段放置图片） ---------- */
.figure {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.figure__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--panel);
  background-image:
    linear-gradient(135deg, rgba(47, 214, 232, .10), transparent 58%),
    repeating-linear-gradient(0deg, var(--line-soft) 0 1px, transparent 1px 26px);
  box-shadow: var(--shadow);
}

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

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

.figure__cap {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--silver);
}

/* ---------- 15. 显现动效 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .32s ease-out, transform .32s ease-out;
}

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

/* ---------- 16. 平板 ---------- */
@media (max-width: 1023px) {
  .masthead__field { display: none; }

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

  .masthead__inner { justify-content: space-between; }

  .masthead__panel {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 4px var(--gutter) 20px;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    background: var(--panel);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
  }

  .masthead[data-open="true"] .masthead__panel { display: flex; }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .primary-nav__link {
    justify-content: space-between;
    width: 100%;
    padding: 15px 0;
    font-size: 15px;
    letter-spacing: .16em;
    border-bottom: 1px solid var(--line-soft);
  }

  .primary-nav__link::after { display: none; }

  .primary-nav__link[aria-current="page"] { color: var(--cyan); }
  .primary-nav__link[aria-current="page"]::before { color: var(--amber); }

  .masthead__utility {
    flex-direction: column;
    align-items: stretch;
    margin-top: 18px;
  }

  .masthead__utility .btn {
    width: 100%;
    padding: 13px 16px;
  }

  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__col--brand { grid-column: 1 / -1; }

  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .grid--aside,
  .grid--aside-rev { grid-template-columns: 1fr; }
}

/* ---------- 17. 手机 ---------- */
@media (max-width: 640px) {
  :root { --header-h: 82px; }

  body { font-size: 16px; }

  .brand__tagline {
    font-size: 10.5px;
    letter-spacing: .2em;
  }

  .brand__meter { font-size: 10px; }

  .masthead__inner { gap: 12px; }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }

  .data-list__row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .data-list__meta { white-space: normal; }

  .footer__grid { grid-template-columns: 1fr; }
  .footer__col--brand { grid-column: auto; }
  .footer__bottom-inner { flex-direction: column; }
  .footer__cta { align-self: stretch; }
}

/* ---------- 18. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .scroll-progress__bar { transition: none; }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}