/* ==========================================================================
   永信贵宾会 · 全站共享样式表  /assets/site.css
   奶油纸感底 + 深墨绿主色 + 暗金线 + 朱砂红点睛
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--bar-h) + 20px);
}

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

ol, ul { 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; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }

/* 2. 设计变量 ------------------------------------------------------------ */
:root {
  --cream: #F5F1E7;
  --shell: #FAF7F1;
  --forest: #123A31;
  --forest-2: #1C5044;
  --forest-3: #0B2820;
  --gold-line: #A98A46;
  --gold-bright: #D4B978;
  --gold-deep: #7A6224;
  --cinnabar: #B23A2F;
  --teal: #33665B;
  --ink: #241E17;
  --muted: #6B6154;

  --rail-w: 88px;
  --bar-h: 68px;
  --shell-max: 1200px;
  --gut: 32px;

  --font-head: "Source Han Serif SC", "Songti SC", "Noto Serif CJK SC", "STSong", "SimSun", serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --r-card: 14px;
  --r-tag: 4px;
  --r-btn: 8px;
  --r-chart: 6px;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 200ms;
}

/* 3. 基础排版 ------------------------------------------------------------ */
body {
  font-family: var(--font-body);
  font-size: 16.5px;
  font-weight: 400;
  line-height: 1.8;
  color: var(--ink);
  background-color: var(--cream);
  background-image:
    radial-gradient(circle at 10% 6%, rgba(169, 138, 70, 0.08), transparent 42%),
    radial-gradient(circle at 92% 86%, rgba(18, 58, 49, 0.07), transparent 46%);
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--forest);
  margin-block: 0.6em;
}
h1 { font-size: clamp(28px, 4.2vw, 52px); }
h2 { font-size: clamp(22px, 2.6vw, 32px); }
h3 { font-size: clamp(18px, 1.8vw, 24px); }
h4 { font-size: 18px; }
h1:first-child, h2:first-child, h3:first-child { margin-block-start: 0; }

p { margin-block: 0 1em; }
p:last-child { margin-block-end: 0; }

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

::selection { background: var(--gold-bright); color: var(--forest-3); }

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

.mono,
[data-year],
.meta-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

/* 4. 跳过链接 ------------------------------------------------------------ */
.skip-link {
  position: fixed;
  top: 10px;
  left: calc(var(--rail-w) + 12px);
  z-index: 300;
  padding: 10px 18px;
  font-size: 14px;
  color: var(--gold-bright);
  background: var(--forest-3);
  border: 1px solid var(--gold-line);
  border-radius: var(--r-btn);
  transform: translateY(-170%);
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* 5. 页头 ---------------------------------------------------------------- */
.site-header {
  position: relative;
  z-index: 80;
}

/* --- 5.1 左侧品牌轨道 --- */
.brand-rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 90;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 26px 0 22px;
  color: var(--cream);
  background-color: var(--forest);
  background-image:
    linear-gradient(180deg, rgba(212, 185, 120, 0.14) 0, rgba(212, 185, 120, 0) 46%),
    repeating-linear-gradient(0deg, rgba(245, 241, 231, 0.05) 0 1px, transparent 1px 26px);
  border-right: 1px solid var(--gold-line);
}

.brand-rail__mark {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--cream);
}
.brand-rail__cn {
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.1;
}
.brand-rail__rule {
  width: 20px;
  height: 1px;
  background: var(--gold-bright);
}
.brand-rail__en {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.3em;
  color: var(--gold-bright);
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.brand-rail__index {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.brand-rail__idx {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(245, 241, 231, 0.5);
  border: 1px solid rgba(169, 138, 70, 0.36);
  border-radius: 50%;
  transition: color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}
.brand-rail__idx.is-active {
  color: var(--forest-3);
  background: var(--gold-bright);
  border-color: var(--gold-bright);
}

.brand-rail__lang {
  font-size: 12px;
  letter-spacing: 0.24em;
  writing-mode: vertical-rl;
  color: var(--gold-bright);
  padding-bottom: 4px;
}

/* --- 5.2 紧凑命令栏 --- */
.command-bar {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  z-index: 70;
  height: var(--bar-h);
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 0 26px;
  background: rgba(245, 241, 231, 0.86);
  -webkit-backdrop-filter: blur(12px) saturate(1.15);
  backdrop-filter: blur(12px) saturate(1.15);
  border-bottom: 1px solid var(--gold-line);
}

.command-bar__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--cinnabar), var(--gold-bright));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 120ms linear;
}

.command-bar__brand {
  display: none;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--forest);
  white-space: nowrap;
}

.command-nav { min-width: 0; }

.command-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.command-nav__item { position: relative; }

.command-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 13px;
  font-size: 15px;
  color: var(--ink);
  border-radius: var(--r-btn);
  transition: color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}
.command-nav__link::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 3px;
  height: 2px;
  background: var(--cinnabar);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}
.command-nav__link:hover {
  color: var(--forest);
  background: var(--shell);
}
.command-nav__link:hover::after { transform: scaleX(1); }

.command-nav__link[aria-current="page"] {
  color: var(--forest);
  font-weight: 600;
}
.command-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.command-nav__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--gold-deep);
}
.command-nav__label { white-space: nowrap; }

.command-nav__foot { display: none; }

.command-bar__utility {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: auto;
}

.command-bar__cta {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 18px;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--gold-bright);
  background: var(--forest);
  border: 1px solid var(--gold-line);
  border-radius: var(--r-btn);
  white-space: nowrap;
  transition: background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}
.command-bar__cta:hover {
  background: var(--forest-2);
  border-color: var(--gold-bright);
  color: var(--cream);
}

.command-bar__lang {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gold-deep);
  padding-left: 14px;
  border-left: 1px solid rgba(169, 138, 70, 0.5);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--forest);
  border: 1px solid rgba(169, 138, 70, 0.6);
  border-radius: var(--r-btn);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--gold-bright); }
.nav-toggle__bars { display: flex; flex-direction: column; gap: 4px; width: 16px; }
.nav-toggle__bars i {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur) var(--ease);
}
.site-header[data-open="true"] .nav-toggle__bars i:first-child { transform: translateY(2.75px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars i:last-child { transform: translateY(-2.75px) rotate(-45deg); }

/* 6. 页脚 ---------------------------------------------------------------- */
.site-footer {
  position: relative;
  margin-top: 104px;
  padding: 68px 28px 44px;
  overflow: hidden;
  color: #E8E1D2;
  background: var(--forest-3);
  border-top: 1px solid var(--gold-line);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(169, 138, 70, 0.08) 0 1px, transparent 1px 72px),
    radial-gradient(circle at 84% 8%, rgba(212, 185, 120, 0.1), transparent 52%);
  pointer-events: none;
}
.site-footer__inner {
  position: relative;
  z-index: 1;
  max-width: var(--shell-max);
  margin-inline: auto;
}

.site-footer__brand {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  padding-bottom: 26px;
  margin-bottom: 44px;
  border-bottom: 1px solid rgba(169, 138, 70, 0.42);
}
.site-footer__wordmark {
  font-family: var(--font-head);
  font-size: 30px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cream);
}
.site-footer__edition {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold-bright);
}

.site-footer__cols {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1.2fr;
  gap: 32px;
}

.footer-col__title {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--gold-bright);
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(169, 138, 70, 0.3);
}
.footer-col p {
  font-size: 14px;
  line-height: 1.85;
  color: rgba(232, 225, 210, 0.82);
}
.footer-col__list { display: grid; gap: 10px; }
.footer-col__list a {
  position: relative;
  display: inline-block;
  font-size: 14px;
  color: rgba(232, 225, 210, 0.82);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}
.footer-col__list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 0;
  background: var(--cinnabar);
  transform: translateY(-50%);
  transition: height var(--dur) var(--ease);
}
.footer-col__list a:hover {
  color: var(--gold-bright);
  padding-left: 12px;
}
.footer-col__list a:hover::before { height: 14px; }

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 24px;
  margin-top: 52px;
  padding-top: 24px;
  border-top: 1px solid rgba(169, 138, 70, 0.42);
}
.site-footer__copy {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(232, 225, 210, 0.7);
}
.site-footer__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
}
.site-footer__legal-links a {
  font-size: 13px;
  color: var(--gold-bright);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}
.site-footer__legal-links a:hover { border-bottom-color: var(--gold-bright); }

.site-footer__note {
  margin: 18px 0 0;
  max-width: 76ch;
  font-size: 13px;
  line-height: 1.8;
  color: rgba(232, 225, 210, 0.6);
}

/* 7. 正文容器与分区 ------------------------------------------------------ */
.page-shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: 28px;
}

.section-band { padding: 72px 0; }
.section-band--cream { background: var(--cream); }
.section-band--shell {
  background: var(--shell);
  border-block: 1px solid rgba(169, 138, 70, 0.32);
}
.section-band--forest {
  position: relative;
  color: #E8E1D2;
  background: var(--forest);
  border-block: 1px solid var(--gold-line);
}
.section-band--forest h2,
.section-band--forest h3,
.section-band--forest strong { color: var(--cream); }
.section-band--forest p { color: rgba(232, 225, 210, 0.86); }

/* 8. 通用组件 ------------------------------------------------------------ */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold-deep);
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--gold-line);
}
.section-band--forest .eyebrow { color: var(--gold-bright); }

.lede {
  max-width: 62ch;
  font-size: 18px;
  line-height: 1.85;
  color: var(--muted);
}
.section-band--forest .lede { color: rgba(232, 225, 210, 0.84); }

.meta-num {
  display: inline-block;
  font-size: 13px;
  color: var(--gold-deep);
}

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--gold-line);
  opacity: 0.5;
}
.section-band--forest .rule { background: var(--forest-2); opacity: 1; }

.stack > * + * { margin-top: 18px; }

/* 面包屑 */
.breadcrumb { padding: 24px 0 6px; }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}
.breadcrumb__item { display: inline-flex; align-items: center; }
.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--gold-line);
}
.breadcrumb__list a {
  padding-bottom: 1px;
  border-bottom: 1px solid rgba(169, 138, 70, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.breadcrumb__list a:hover {
  color: var(--forest);
  border-bottom-color: var(--gold-bright);
}
.breadcrumb__item[aria-current="page"] { color: var(--gold-deep); }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 12px 22px;
  font-size: 14.5px;
  letter-spacing: 0.04em;
  border: 1px solid var(--gold-line);
  border-radius: var(--r-btn);
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.btn--solid {
  color: var(--gold-bright);
  background: var(--forest);
}
.btn--solid:hover {
  color: var(--cream);
  background: var(--forest-2);
  border-color: var(--gold-bright);
}
.btn--ghost {
  color: var(--forest);
  background: transparent;
}
.btn--ghost:hover {
  color: var(--forest-2);
  background: var(--shell);
  border-color: var(--gold-bright);
}
.btn--line {
  color: var(--gold-deep);
  background: transparent;
  border-color: rgba(169, 138, 70, 0.5);
}
.btn--line:hover {
  color: var(--forest);
  background: var(--shell);
  border-color: var(--gold-bright);
}
.section-band--forest .btn--ghost { color: var(--cream); }
.section-band--forest .btn--ghost:hover { color: var(--forest-3); background: var(--gold-bright); }

/* 卡片 */
.card {
  position: relative;
  padding: 26px 24px;
  background: var(--shell);
  border: 1px solid rgba(169, 138, 70, 0.42);
  border-radius: var(--r-card);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.card::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 3px;
  height: 0;
  background: var(--cinnabar);
  border-radius: 0 0 0 var(--r-card);
  transition: height var(--dur) var(--ease);
}
.card:hover { border-color: var(--gold-bright); }
.card:hover::before { height: 46%; }
.section-band--forest .card {
  background: var(--forest-2);
  border-color: rgba(169, 138, 70, 0.5);
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold-deep);
  background: rgba(250, 247, 241, 0.72);
  border: 1px solid rgba(169, 138, 70, 0.45);
  border-radius: var(--r-tag);
}
.tag--forest {
  color: var(--gold-bright);
  background: var(--forest);
  border-color: var(--forest-2);
}
.tag--red {
  color: var(--cinnabar);
  border-color: var(--cinnabar);
  background: rgba(178, 58, 47, 0.07);
}

/* 网格 */
.grid-2 {
  display: grid;
  gap: var(--gut);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.grid-3 {
  display: grid;
  gap: var(--gut);
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.grid-asym {
  display: grid;
  gap: var(--gut);
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  align-items: start;
}

/* 图片容器 */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--forest-3);
  border: 1px solid rgba(169, 138, 70, 0.4);
  border-radius: var(--r-card);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--portrait { aspect-ratio: 4 / 5; }
.media-frame--chart { aspect-ratio: 3 / 2; border-radius: var(--r-chart); }

.media-frame__inner { position: absolute; inset: 0; }
.media-frame__inner > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--cream);
  background: linear-gradient(to top, rgba(11, 40, 32, 0.92), rgba(11, 40, 32, 0));
}

.media-frame--placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(135deg, rgba(169, 138, 70, 0.12) 0 12px, transparent 12px 26px),
    radial-gradient(circle at 26% 24%, rgba(212, 185, 120, 0.14), transparent 58%);
}

/* 显现 */
@media (prefers-reduced-motion: no-preference) {
  [data-reveal] {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 320ms var(--ease), transform 320ms var(--ease);
  }
  [data-reveal="in"] {
    opacity: 1;
    transform: none;
  }
}

/* 9. 响应式 -------------------------------------------------------------- */
@media (min-width: 1024px) {
  body {
    padding-left: var(--rail-w);
    padding-top: var(--bar-h);
  }
}

@media (max-width: 1023px) {
  :root { --bar-h: 58px; }

  body {
    padding-top: var(--bar-h);
    padding-bottom: 78px;
    background-attachment: scroll;
  }

  .skip-link { left: 12px; }

  .brand-rail { display: none; }

  .command-bar {
    left: 0;
    height: var(--bar-h);
    padding: 0 16px;
    gap: 12px;
    background: rgba(245, 241, 231, 0.94);
  }

  .command-bar__brand { display: block; }
  .command-bar__cta,
  .command-bar__lang { display: none; }
  .nav-toggle { display: inline-flex; }

  .command-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    z-index: 95;
    max-height: 78vh;
    overflow-y: auto;
    padding: 16px 14px calc(20px + env(safe-area-inset-bottom, 0px));
    background: var(--forest);
    border-top: 1px solid var(--gold-line);
    border-radius: 18px 18px 0 0;
    box-shadow: 0 -20px 44px rgba(11, 40, 32, 0.32);
    transform: translateY(103%);
    visibility: hidden;
    transition: transform 260ms var(--ease), visibility 0s linear 260ms;
  }
  .site-header[data-open="true"] .command-nav {
    transform: translateY(0);
    visibility: visible;
    transition: transform 260ms var(--ease), visibility 0s;
  }

  .command-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .command-nav__item { border-bottom: 1px solid rgba(169, 138, 70, 0.22); }
  .command-nav__item:last-child { border-bottom: 0; }

  .command-nav__link {
    justify-content: flex-start;
    padding: 15px 12px 15px 20px;
    font-size: 16px;
    color: #E8E1D2;
    border-radius: 0;
  }
  .command-nav__link::after { display: none; }
  .command-nav__link:hover { background: rgba(212, 185, 120, 0.08); color: var(--gold-bright); }
  .command-nav__idx { color: var(--gold-line); font-size: 11px; }
  .command-nav__link[aria-current="page"] { color: var(--gold-bright); }
  .command-nav__link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 3px;
    height: 22px;
    background: var(--cinnabar);
    transform: translateY(-50%);
  }

  .command-nav__foot {
    display: block;
    margin: 16px 0 0;
    padding-top: 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--gold-bright);
    border-top: 1px solid rgba(169, 138, 70, 0.3);
  }

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

  .site-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer { margin-top: 72px; padding: 52px 20px 36px; }
  .section-band { padding: 52px 0; }
  .page-shell { padding-inline: 20px; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .site-footer__cols { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .site-footer__brand { margin-bottom: 32px; }
  .site-footer__wordmark { font-size: 24px; }
  .site-footer__legal { justify-content: flex-start; }
  .lede { font-size: 16.5px; }
  .card { padding: 22px 18px; }
  .page-shell { padding-inline: 18px; }
}

/* 10. 减弱动效 ----------------------------------------------------------- */
@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;
    transition-delay: 0s !important;
  }
  .command-nav { transform: none !important; }
}