/* ============================================================
   爱游戏赛场 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 页头 / 页脚 / 基础组件
   ============================================================ */

:root {
  color-scheme: light;

  --paper: #F2E9DC;
  --ink: #131318;
  --ink-soft: #5A5B63;
  --jade: #0F8A6B;
  --jade-deep: #0A5E4A;
  --track: #E8452C;
  --track-soft: #F4A28C;
  --night: #241A46;
  --glow: #4A2E7A;
  --timer: #F5C518;
  --rule: #C9BEAE;

  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC",
    system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  --shell: 1360px;
  --pad: clamp(18px, 4.4vw, 52px);
  --header-h: 68px;
  --fs-body: 17px;

  --ease: cubic-bezier(.2, .7, .2, 1);
  --edge-line: rgba(242, 233, 220, .22);
}

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

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

body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(201, 190, 174, .28) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 190, 174, .28) 1px, transparent 1px);
  background-size: 100% 96px, 96px 100%;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}

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

ul, ol { margin: 0; padding: 0; }

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

img { height: auto; }

a { color: inherit; }

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

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

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 0;
}

/* ---------- 焦点 ---------- */
:focus-visible {
  outline: 2px solid var(--track);
  outline-offset: 3px;
}

.site-footer :focus-visible {
  outline-color: var(--timer);
}

:target {
  scroll-margin-top: calc(var(--header-measured, 72px) + 20px);
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 11px 20px;
  background: var(--ink);
  color: var(--paper);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  text-decoration: none;
  transform: translateY(-220%);
  transition: transform .2s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
  outline-color: var(--timer);
}

/* ---------- 内容壳 ---------- */
.wrap {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad);
}

/* ---------- 页面视觉边框 ---------- */
.edge-rules { display: none; }

@media (min-width: 1440px) {
  .edge-rules { display: block; }

  .edge-rules span {
    position: fixed;
    top: 0;
    bottom: 0;
    display: block;
    width: 1px;
    background: var(--rule);
    z-index: 1;
    pointer-events: none;
  }

  .edge-rules span:first-child {
    left: calc(50% - var(--shell) / 2 + var(--pad));
  }

  .edge-rules span:last-child {
    right: calc(50% - var(--shell) / 2 + var(--pad));
  }
}

/* ============================================================
   页头
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(242, 233, 220, .94);
  -webkit-backdrop-filter: saturate(1.5) blur(10px);
  backdrop-filter: saturate(1.5) blur(10px);
  border-bottom: 1px solid var(--ink);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--jade) 0%, var(--glow) 46%, var(--track) 78%, var(--timer) 100%);
}

.site-header__bar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(12px, 2.2vw, 38px);
  min-height: var(--header-h);
  padding-block: 9px;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-self: end;
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}

.scroll-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--jade) 0%, var(--timer) 58%, var(--track) 100%);
}

/* ---------- 品牌 ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: var(--ink);
  padding: 3px 0;
  min-width: 0;
}

.brand__mark {
  flex: none;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background: var(--ink);
  color: var(--timer);
  font-size: 18px;
  font-weight: 800;
  line-height: 1;
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  line-height: 1.16;
}

.brand__name {
  font-size: 16.5px;
  font-weight: 800;
  letter-spacing: .07em;
  white-space: nowrap;
}

.brand__line {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--jade-deep);
  white-space: nowrap;
}

.brand:hover .brand__name { color: var(--jade-deep); }

/* ---------- 主导航 ---------- */
.primary-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(6px, 1.4vw, 22px);
  min-width: 0;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0px, .5vw, 4px);
  list-style: none;
}

.primary-nav__item { display: flex; }

.primary-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 11px;
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s var(--ease);
}

.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 3px;
  height: 2px;
  background: var(--jade);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .22s var(--ease), background-color .18s var(--ease);
}

.primary-nav__link:hover { color: var(--jade-deep); }
.primary-nav__link:hover::after { transform: scaleX(1); }

.primary-nav__link[aria-current="page"] {
  color: var(--jade-deep);
  font-weight: 700;
}

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

.primary-nav__idx {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--jade);
}

.primary-nav__link:hover .primary-nav__idx { color: var(--jade-deep); }

.primary-nav__link[aria-current="page"] .primary-nav__idx { color: var(--track); }

.primary-nav__utils {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-left: clamp(8px, 1.2vw, 18px);
  border-left: 1px solid var(--rule);
}

.util-link {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 6px 2px;
  white-space: nowrap;
  transition: color .18s var(--ease);
}

.util-link:hover {
  color: var(--jade-deep);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ---------- 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  border: 1px solid var(--ink);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--ink);
  transition: background-color .18s var(--ease), color .18s var(--ease);
}

.nav-toggle:hover {
  background: var(--ink);
  color: var(--paper);
}

.nav-toggle:hover .nav-toggle__bars span { background: var(--paper); }

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: var(--ink);
  transition: transform .2s var(--ease), opacity .2s var(--ease), background-color .18s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  z-index: 2;
  margin-top: clamp(64px, 8vw, 120px);
  background: linear-gradient(168deg, var(--night) 0%, #1A1430 48%, var(--ink) 100%);
  color: var(--paper);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg,
    var(--jade) 0 34%,
    var(--track) 34% 67%,
    var(--timer) 67% 100%);
}

.site-footer::after {
  content: "";
  position: absolute;
  top: -150px;
  right: -80px;
  width: min(620px, 74vw);
  height: 460px;
  background: radial-gradient(closest-side, rgba(74, 46, 122, .92), rgba(74, 46, 122, 0));
  pointer-events: none;
  z-index: 0;
}

.site-footer__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns:
    minmax(230px, 1.6fr)
    repeat(3, minmax(118px, .85fr))
    minmax(215px, 1.25fr);
  gap: clamp(26px, 3.2vw, 54px);
  padding-block: clamp(52px, 6.4vw, 92px) clamp(38px, 5vw, 64px);
}

.brand--footer .brand__name { color: var(--paper); }
.brand--footer .brand__line { color: var(--track-soft); }
.brand--footer .brand__mark { background: var(--timer); color: var(--ink); }
.brand--footer:hover .brand__name { color: var(--timer); }

.site-footer__lede {
  margin-top: 18px;
  max-width: 34ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 233, 220, .72);
}

.site-footer__chips {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--timer);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--edge-line);
}

.footer-col__list {
  list-style: none;
  margin-top: 16px;
  display: grid;
  gap: 9px;
}

.footer-col__link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 3px 0;
  font-size: 14.5px;
  color: rgba(242, 233, 220, .84);
  text-decoration: none;
  transition: color .18s var(--ease), transform .18s var(--ease);
}

.footer-col__link::before {
  content: "";
  flex: none;
  width: 6px;
  height: 1px;
  background: var(--jade);
  transition: width .18s var(--ease), background-color .18s var(--ease);
}

.footer-col__link:hover {
  color: #fff;
  transform: translateX(4px);
}

.footer-col__link:hover::before {
  width: 15px;
  background: var(--track);
}

.footer-contact__list {
  margin-top: 16px;
  display: grid;
  gap: 0;
}

.footer-contact__row {
  padding: 11px 0;
  border-bottom: 1px dashed rgba(242, 233, 220, .18);
}

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

.footer-contact__k {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .16em;
  color: rgba(242, 233, 220, .55);
}

.footer-contact__v {
  margin: 3px 0 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: #fff;
  overflow-wrap: break-word;
  word-break: break-word;
}

.site-footer__legal {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--edge-line);
  background: rgba(0, 0, 0, .24);
}

.site-footer__legal-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 26px;
  padding-block: 16px;
  font-size: 12.5px;
  color: rgba(242, 233, 220, .62);
}

.site-footer__copy { font-family: var(--font-mono); letter-spacing: .04em; }
.site-footer__icp { font-family: var(--font-mono); letter-spacing: .04em; }
.site-footer__note { margin-left: auto; }

/* ============================================================
   通用组件
   ============================================================ */

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 0;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .05em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .18s var(--ease), color .18s var(--ease),
    border-color .18s var(--ease), transform .18s var(--ease);
}

.btn--accent {
  background: var(--track);
  border-color: var(--track);
  color: #fff;
}

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

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

.btn--ink:hover {
  background: var(--jade-deep);
  border-color: var(--jade-deep);
}

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

.btn--ghost:hover {
  background: var(--ink);
  color: var(--paper);
}

.btn--sm {
  padding: 8px 14px;
  font-size: 12.5px;
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--rule);
  background: rgba(201, 190, 174, .22);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1.5;
  color: var(--ink-soft);
  white-space: nowrap;
}

.tag--live {
  background: var(--track);
  border-color: var(--track);
  color: #fff;
}

.tag--soon {
  background: var(--timer);
  border-color: var(--timer);
  color: var(--ink);
}

.tag--open {
  background: var(--jade);
  border-color: var(--jade);
  color: #fff;
}

.tag--night {
  background: rgba(36, 26, 70, .9);
  border-color: var(--glow);
  color: var(--paper);
}

/* ---------- 面包屑 ---------- */
.breadcrumbs { padding-top: 20px; }

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--ink-soft);
}

.breadcrumbs__list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs__list li + li::before {
  content: "/";
  color: var(--rule);
}

.breadcrumbs__list a {
  color: var(--ink-soft);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.breadcrumbs__list a:hover {
  color: var(--jade-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 区块与网格 ---------- */
.section { padding-block: clamp(44px, 6vw, 92px); }
.section--tight { padding-block: clamp(28px, 4vw, 56px); }

.grid {
  display: grid;
  gap: clamp(16px, 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)); }

.stack > * + * { margin-top: var(--stack-gap, 18px); }

/* ---------- 排版工具 ---------- */
.display {
  font-family: var(--font-sans);
  font-size: clamp(2.8rem, 9vw, 7.6rem);
  font-weight: 200;
  line-height: .9;
  letter-spacing: -.02em;
  text-wrap: balance;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--jade-deep);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--track);
}

.chapter-index {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 5.6vw, 4.4rem);
  font-weight: 700;
  line-height: .86;
  letter-spacing: -.02em;
  color: var(--jade);
}

@supports (-webkit-text-stroke: 1px black) {
  .chapter-index {
    color: transparent;
    -webkit-text-stroke: 1.5px var(--jade);
  }
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
  color: var(--jade-deep);
}

/* ---------- 图片容器 ---------- */
.figure {
  position: relative;
  display: block;
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--rule);
  background: linear-gradient(135deg, rgba(15, 138, 107, .16), rgba(36, 26, 70, .22));
  aspect-ratio: 16 / 10;
}

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

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

.figure--slant {
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
}

.figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--ink-soft);
}

/* ---------- 标签页 ---------- */
.tabs { border-top: 1px solid var(--ink); }

.tabs__list {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--rule);
}

.tabs__tab {
  position: relative;
  margin-bottom: -1px;
  padding: 12px 18px;
  border: 1px solid transparent;
  border-bottom: 0;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ink-soft);
  transition: color .18s var(--ease), background-color .18s var(--ease);
}

.tabs__tab:hover { color: var(--jade-deep); }

.tabs__tab[aria-selected="true"] {
  color: var(--ink);
  background: var(--paper);
  border-color: var(--rule);
  border-bottom-color: var(--paper);
  box-shadow: inset 0 3px 0 0 var(--track);
}

.tabs__tab:focus-visible {
  outline: 2px solid var(--track);
  outline-offset: -3px;
}

.tabs__panel { padding-top: 24px; }
.tabs__panel[hidden] { display: none; }

/* ---------- 手风琴 ---------- */
.accordion { border-top: 1px solid var(--rule); }

.accordion__item { border-bottom: 1px solid var(--rule); }

.accordion__trigger {
  width: 100%;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 4px;
  text-align: left;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
  transition: color .18s var(--ease);
}

.accordion__trigger:hover { color: var(--jade-deep); }

.accordion__mark {
  position: relative;
  flex: none;
  width: 18px;
  height: 18px;
  margin-top: 4px;
}

.accordion__mark::before,
.accordion__mark::after {
  content: "";
  position: absolute;
  background: var(--jade);
}

.accordion__mark::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 2px;
}

.accordion__mark::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
  transition: transform .2s var(--ease);
}

.accordion__trigger[aria-expanded="true"] .accordion__mark::after {
  transform: scaleY(0);
}

.accordion__panel {
  padding: 0 4px 22px;
  font-size: 15.5px;
  color: var(--ink-soft);
}

.accordion__panel[hidden] { display: none; }

/* ---------- 数据表 ---------- */
.table {
  width: 100%;
  font-size: 14.5px;
}

.table th,
.table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--rule);
}

.table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--ink-soft);
  border-bottom-color: var(--ink);
}

.table tbody tr { transition: background-color .16s var(--ease); }
.table tbody tr:hover { background: rgba(15, 138, 107, .07); }

/* ---------- 显现 ---------- */
@media (prefers-reduced-motion: no-preference) {
  [data-reveal-ready] [data-reveal] {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity .55s var(--ease), transform .55s var(--ease);
  }

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

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1150px) {
  .primary-nav__idx { display: none; }
}

@media (max-width: 1060px) {
  .primary-nav__utils { display: none; }
}

/* ---------- 平板与手机：导航折叠为面板 ---------- */
@media (max-width: 959px) {
  .site-header__bar {
    grid-template-columns: minmax(0, 1fr) auto;
  }

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

  .primary-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--header-measured, 68px);
    max-height: calc(100dvh - var(--header-measured, 68px));
    overflow-y: auto;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 8px var(--pad) 28px;
    background: var(--paper);
    border-bottom: 1px solid var(--ink);
    box-shadow: 0 20px 44px rgba(19, 19, 24, .16);
    z-index: 55;
  }

  .primary-nav[data-open] {
    display: flex;
    animation: navDrop .22s var(--ease) both;
  }

  @keyframes navDrop {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: none; }
  }

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

  .primary-nav__item + .primary-nav__item {
    border-top: 1px solid var(--rule);
  }

  .primary-nav__link {
    justify-content: flex-start;
    padding: 15px 4px;
    font-size: 17px;
    font-weight: 700;
  }

  .primary-nav__link::after {
    left: 4px;
    right: 4px;
    bottom: 8px;
  }

  .primary-nav__idx { display: inline; }

  .primary-nav__utils {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    margin-top: 6px;
    padding: 16px 4px 0;
    border-left: 0;
    border-top: 1px solid var(--rule);
  }

  .util-link { font-size: 13.5px; }

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

  .site-footer__brand { grid-column: 1 / -1; }

  .site-footer__note { margin-left: 0; flex-basis: 100%; }
}

@media (max-width: 639px) {
  :root { --fs-body: 16.5px; --header-h: 62px; }

  .site-header__bar { padding-block: 8px; }

  .brand__mark { width: 32px; height: 32px; font-size: 16px; }

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

  .footer-col__title:not(:first-child) { margin-top: 4px; }

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

@media (max-width: 520px) {
  .brand__line { display: none; }

  .brand__name { font-size: 15px; letter-spacing: .05em; }

  .site-header__actions .btn--sm {
    padding: 8px 11px;
    font-size: 12px;
  }

  .nav-toggle__label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .nav-toggle { padding: 10px 12px; }
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .footer-col__link:hover { transform: none; }
  .primary-nav__link::after { transition: none; }
}