/* ============================================================
   银河主页 · 共享样式 /assets/site.css
   包含：reset、CSS 变量、中文排版、页头、页脚、按钮、
        面包屑、正文容器、网格、基础组件、图片容器、响应式
   ============================================================ */

/* ---------- 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, figure, blockquote, dl, dd, dt { margin: 0; }

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

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
}

button { cursor: pointer; }

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

table { border-collapse: collapse; width: 100%; }

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

[id] { scroll-margin-top: 7rem; }

main { display: block; }

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 色彩 */
  --ink-900: #0B1A3A;
  --ink-800: #12224A;
  --violet: #6C4AB6;
  --violet-soft: #8B6BD6;
  --gold: #F2B705;
  --glacier: #7FD8D8;
  --snow: #E8ECF7;
  --dust: #9AA7C7;
  --orbit: #2E3A5C;
  --jade: #2FA98C;

  /* 字体 */
  --font-display: 'HarmonyOS Sans SC', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Roboto Mono', 'SFMono-Regular', Consolas, monospace;

  /* 尺度 */
  --notch: 14px;
  --shell: 1240px;
  --gutter: clamp(1.15rem, 4vw, 2.75rem);
  --ease: cubic-bezier(.22, .7, .3, 1);
}

/* ---------- 3. 基础排版与银河底色 ---------- */
body {
  background-color: var(--ink-900);
  color: var(--snow);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.85;
  letter-spacing: .01em;
  overflow-x: hidden;
  min-height: 100%;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(980px 560px at 84% -10%, rgba(108, 74, 182, .34), transparent 70%),
    radial-gradient(700px 440px at 6% 14%, rgba(127, 216, 216, .13), transparent 72%),
    radial-gradient(1200px 720px at 50% 112%, rgba(242, 183, 5, .07), transparent 70%),
    var(--ink-900);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: .5;
  background-image:
    radial-gradient(rgba(232, 236, 247, .7) 1px, transparent 1px),
    radial-gradient(rgba(232, 236, 247, .35) 1px, transparent 1px);
  background-size: 200px 200px, 116px 116px;
  background-position: 0 0, 62px 94px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.2;
  color: var(--snow);
}

p { max-width: 74ch; }

strong { color: var(--gold); font-weight: 700; }

a { transition: color .15s var(--ease), border-color .15s var(--ease); }

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

.mono-index {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--dust);
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .24s ease-out, transform .24s ease-out;
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -120px;
  z-index: 200;
  padding: .6rem 1rem;
  background: var(--glacier);
  color: var(--ink-900);
  font-weight: 700;
  font-size: .875rem;
  border-radius: 0 0 6px 6px;
  transition: top .15s var(--ease);
}

.skip-link:focus {
  top: 0;
}

/* ---------- 6. 按钮 ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .62rem 1.05rem;
  font-family: var(--font-display);
  font-size: .9375rem;
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1.4;
  color: var(--snow);
  background: rgba(232, 236, 247, .04);
  border: 1px solid var(--orbit);
  border-radius: 4px;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: transform .12s var(--ease), background-color .18s var(--ease),
              border-color .18s var(--ease), filter .18s var(--ease);
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn:focus-visible { outline: none; }

.btn:focus-visible::after {
  content: "";
  position: absolute;
  inset: 2px;
  border: 2px solid var(--glacier);
  border-radius: 2px;
  pointer-events: none;
}

.btn--gold {
  color: var(--ink-900);
  background: var(--gold);
  border-color: var(--gold);
  filter: drop-shadow(0 6px 14px rgba(242, 183, 5, .26));
}

.btn--gold:hover {
  filter: drop-shadow(0 10px 22px rgba(242, 183, 5, .42));
}

.btn--quiet {
  color: var(--snow);
  background: rgba(232, 236, 247, .05);
  border-color: var(--orbit);
}

.btn--quiet:hover {
  background: rgba(127, 216, 216, .12);
  border-color: var(--glacier);
}

.btn--sm {
  padding: .42rem .8rem;
  font-size: .8125rem;
}

/* ---------- 7. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(11, 26, 58, .97), rgba(11, 26, 58, .88));
  border-bottom: 1px solid var(--orbit);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.header-utility {
  background:
    linear-gradient(90deg, rgba(108, 74, 182, .32), rgba(11, 26, 58, .1) 52%, rgba(11, 26, 58, 0));
  border-bottom: 1px solid rgba(46, 58, 92, .75);
}

.header-utility__inner {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  min-height: 46px;
  padding-block: .4rem;
}

.header-utility__statement {
  display: flex;
  align-items: baseline;
  gap: .55rem;
  flex: 0 0 auto;
}

.header-utility__text {
  font-size: .8125rem;
  color: var(--snow);
  white-space: nowrap;
}

.header-utility__note {
  flex: 1 1 auto;
  min-width: 0;
  font-size: .75rem;
  line-height: 1.5;
  color: var(--dust);
  max-width: none;
}

.header-utility__actions {
  flex: 0 0 auto;
  display: flex;
  gap: .55rem;
}

.header-main__inner {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2.25rem);
  min-height: 64px;
  padding-block: .55rem;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  flex: 0 0 auto;
}

.brand__mark {
  position: relative;
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
  border-radius: 50%;
  border: 1px solid var(--orbit);
  background: radial-gradient(circle at 34% 28%, rgba(242, 183, 5, .95), rgba(108, 74, 182, .85) 58%, rgba(11, 26, 58, .9) 100%);
}

.brand__orbit {
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border-top: 1px solid var(--glacier);
  border-right: 1px solid transparent;
  border-bottom: 1px solid transparent;
  border-left: 1px solid rgba(127, 216, 216, .35);
  transform: rotate(34deg);
  pointer-events: none;
}

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

.brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: .1em;
  color: var(--snow);
}

.brand__tag {
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--dust);
}

/* 导航 */
.site-nav { margin-left: auto; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(.3rem, 1.1vw, .85rem);
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
  padding: .5rem .7rem;
  border-radius: 4px;
  font-size: .9375rem;
  color: var(--dust);
  white-space: nowrap;
}

.site-nav__link .mono-index {
  font-size: .625rem;
  color: var(--violet-soft);
  transition: color .15s var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: .7rem;
  right: .7rem;
  bottom: .2rem;
  height: 1px;
  background: var(--glacier);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .18s var(--ease);
}

.site-nav__link:hover { color: var(--snow); }
.site-nav__link:hover::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] {
  color: var(--snow);
  background: rgba(127, 216, 216, .1);
}

.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--gold);
}

.site-nav__link[aria-current="page"] .mono-index { color: var(--gold); }

/* 移动端开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  margin-left: auto;
  padding: .5rem .78rem;
  border: 1px solid var(--orbit);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--snow);
  background: rgba(232, 236, 247, .04);
}

.nav-toggle__glyph {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle__glyph i {
  display: block;
  height: 1.5px;
  background: var(--glacier);
  transition: transform .18s var(--ease), opacity .18s var(--ease);
}

.nav-toggle[aria-expanded="true"] { border-color: var(--glacier); }

.nav-toggle[aria-expanded="true"] .nav-toggle__glyph i:nth-child(1) {
  transform: translateY(4.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__glyph i:nth-child(2) { opacity: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__glyph i:nth-child(3) {
  transform: translateY(-4.5px) rotate(-45deg);
}

/* 滚动进度 */
.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--violet), var(--glacier) 58%, var(--gold));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(4rem, 9vw, 8rem);
  padding-top: clamp(2rem, 5vw, 3.5rem);
  border-top: 1px solid var(--orbit);
  background:
    radial-gradient(900px 420px at 86% 6%, rgba(108, 74, 182, .3), transparent 68%),
    radial-gradient(620px 320px at 6% 34%, rgba(127, 216, 216, .09), transparent 70%),
    var(--ink-900);
  overflow: hidden;
}

.footer-ridge {
  position: relative;
  height: clamp(72px, 11vw, 132px);
  margin-bottom: -1px;
  pointer-events: none;
}

.footer-ridge svg {
  width: 100%;
  height: 100%;
}

.footer-ridge__far { fill: rgba(46, 58, 92, .85); }
.footer-ridge__near { fill: rgba(18, 34, 74, .95); }

.footer-body {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.9fr) minmax(0, 1.05fr);
  gap: clamp(1.75rem, 4vw, 3.25rem);
  padding-block: clamp(1.75rem, 4vw, 3rem) clamp(2rem, 5vw, 3.5rem);
}

.footer-lead { display: flex; flex-direction: column; gap: .85rem; }

.brand--footer .brand__name { font-size: 1.05rem; }

.footer-lead__signature {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--snow);
}

.footer-lead__footnote {
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--dust);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2.5vw, 2rem);
}

.footer-col__title {
  font-family: var(--font-mono);
  font-size: .6875rem;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--violet-soft);
  margin-bottom: .9rem;
}

.footer-col__list li + li { margin-top: .55rem; }

.footer-col__link {
  font-size: .9375rem;
  color: var(--dust);
  border-bottom: 1px solid transparent;
}

.footer-col__link:hover {
  color: var(--glacier);
  border-bottom-color: rgba(127, 216, 216, .45);
}

.footer-contact__list {
  display: grid;
  grid-template-columns: auto;
  gap: .15rem 0;
}

.footer-contact__list dt {
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--dust);
  margin-top: .7rem;
}

.footer-contact__list dt:first-child { margin-top: 0; }

.footer-contact__list dd {
  font-size: .875rem;
  line-height: 1.65;
  color: var(--snow);
  word-break: break-word;
}

.footer-contact__note {
  margin-top: 1rem;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--dust);
}

.footer-legal {
  border-top: 1px solid var(--orbit);
  background: rgba(11, 26, 58, .6);
}

.footer-legal__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem 1.75rem;
  padding-block: 1.1rem;
}

.footer-legal__copy,
.footer-legal__icp {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .12em;
  color: var(--dust);
}

.footer-legal__icp { color: var(--snow); }

/* ---------- 9. 面包屑 ---------- */
.breadcrumb { margin-top: clamp(1.25rem, 3vw, 2rem); }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--dust);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}

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

.breadcrumb__link { color: var(--dust); }

.breadcrumb__link:hover {
  color: var(--glacier);
  border-bottom: 1px solid rgba(127, 216, 216, .45);
}

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

/* ---------- 10. 章节与网格 ---------- */
.section { padding-block: clamp(2.5rem, 6vw, 5rem); }

.section__head { margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem); }

.section__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--glacier);
}

.section__eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: linear-gradient(90deg, var(--violet), var(--glacier));
}

.section__title {
  margin-top: .7rem;
  font-size: clamp(1.9rem, 3.2vw, 2.75rem);
  font-weight: 700;
}

.section__intro {
  margin-top: .9rem;
  color: var(--dust);
  max-width: 62ch;
}

.grid {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.75rem);
}

.grid--5-7 { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid--7-5 { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.grid--4-8 { grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); }
.grid--3-9 { grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); }

/* ---------- 11. 切角面板 ---------- */
.panel {
  position: relative;
  padding: clamp(1.15rem, 2.4vw, 1.9rem);
  background:
    linear-gradient(150deg, rgba(232, 236, 247, .07), rgba(18, 34, 74, .55) 55%, rgba(11, 26, 58, .8));
  border: 1px solid var(--orbit);
  border-radius: 6px;
  clip-path: polygon(
    var(--notch) 0,
    100% 0,
    100% calc(100% - var(--notch)),
    calc(100% - var(--notch)) 100%,
    0 100%,
    0 var(--notch)
  );
}

.panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--notch);
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(127, 216, 216, .55), rgba(127, 216, 216, 0));
  pointer-events: none;
}

/* ---------- 12. 数据卡 / 标签 ---------- */
.stat-card {
  position: relative;
  padding: 1.1rem 1.3rem 1.2rem;
  background: linear-gradient(160deg, rgba(108, 74, 182, .22), rgba(18, 34, 74, .7));
  border: 1px solid var(--orbit);
  border-radius: 6px;
  transition: transform .12s var(--ease), border-color .18s var(--ease);
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: rgba(127, 216, 216, .55);
}

.stat-card::after {
  content: "";
  position: absolute;
  top: .95rem;
  right: .95rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--jade);
  box-shadow: 0 0 0 3px rgba(47, 169, 140, .18);
}

.stat-card__value {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--gold);
}

.stat-card__label {
  margin-top: .35rem;
  font-size: .875rem;
  color: var(--snow);
}

.stat-card__meta {
  margin-top: .4rem;
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--dust);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .38rem .85rem;
  font-size: .8125rem;
  color: var(--dust);
  background: rgba(232, 236, 247, .05);
  border: 1px solid var(--orbit);
  border-radius: 999px;
  transition: color .15s var(--ease), border-color .15s var(--ease), background-color .15s var(--ease);
}

.chip:hover { color: var(--snow); border-color: var(--violet-soft); }

.chip[aria-pressed="true"],
.chip.is-on {
  color: var(--ink-900);
  background: var(--glacier);
  border-color: var(--glacier);
}

/* ---------- 13. 分段切换 ---------- */
.segment__bar {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  padding-bottom: .7rem;
  border-bottom: 1px solid var(--orbit);
}

.segment__btn {
  padding: .5rem .95rem;
  font-family: var(--font-display);
  font-size: .9375rem;
  font-weight: 600;
  color: var(--dust);
  background: rgba(232, 236, 247, .04);
  border: 1px solid transparent;
  border-radius: 4px;
  transition: color .15s var(--ease), background-color .15s var(--ease), border-color .15s var(--ease);
}

.segment__btn:hover { color: var(--snow); border-color: var(--orbit); }

.segment__btn[aria-selected="true"] {
  color: var(--ink-900);
  background: var(--gold);
  border-color: var(--gold);
}

.segment__panel { padding-top: clamp(1rem, 2.4vw, 1.6rem); }

.segment__panel[hidden] { display: none; }

/* ---------- 14. 图片容器 ---------- */
.figure {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--orbit);
  border-radius: 6px;
  background: linear-gradient(135deg, rgba(18, 34, 74, .92), rgba(11, 26, 58, .98));
}

.figure__frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.figure__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(.9) brightness(.86);
}

.figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .32;
  background-image: radial-gradient(rgba(232, 236, 247, .8) 1px, transparent 1px);
  background-size: 46px 46px;
}

.figure__caption {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .5rem 1rem;
  padding: .75rem 1rem;
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--dust);
  border-top: 1px solid var(--orbit);
}

.figure--wide .figure__frame { aspect-ratio: 21 / 9; }
.figure--portrait .figure__frame { aspect-ratio: 3 / 4; }
.figure--square .figure__frame { aspect-ratio: 1 / 1; }

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1279px) {
  .header-utility__note { display: none; }
}

@media (max-width: 1180px) {
  .site-nav__link { font-size: .875rem; padding: .45rem .55rem; }
  .site-nav__link .mono-index { display: none; }
  .site-nav__link::after { left: .55rem; right: .55rem; }
}

@media (max-width: 1023px) {
  .footer-body { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-lead { grid-column: 1 / -1; }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 959px) {
  .header-utility { display: none; }

  .header-main__inner {
    min-height: 60px;
    gap: .85rem;
  }

  .brand__tag { display: none; }

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

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    padding: .5rem var(--gutter) 1.15rem;
    background: linear-gradient(180deg, rgba(11, 26, 58, .99), rgba(18, 34, 74, .99));
    border-bottom: 1px solid var(--orbit);
    box-shadow: 0 24px 40px rgba(4, 10, 24, .55);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
  }

  .site-nav[data-open] { display: block; }

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

  .site-nav__link {
    padding: .85rem .15rem;
    border-radius: 0;
    border-bottom: 1px solid rgba(46, 58, 92, .6);
    font-size: 1rem;
  }

  .site-nav__link .mono-index { display: none; }
  .site-nav__link::after { display: none; }

  .site-nav__link[aria-current="page"] {
    background: transparent;
    color: var(--gold);
  }

  .site-nav__item:last-child .site-nav__link { border-bottom: 0; }

  .grid--5-7,
  .grid--7-5,
  .grid--4-8,
  .grid--3-9 { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 639px) {
  .footer-body { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-legal__inner { flex-direction: column; align-items: flex-start; gap: .35rem; }
  .footer-lead__signature { font-size: 1rem; }
}

/* ---------- 16. 降级与无障碍偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: opacity .15s linear;
  }
}