/* ============================================================
   BSPORTAPP 赛季数据档案 / 共享样式 /assets/site.css
   ============================================================ */

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

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

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

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

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

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

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

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

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0B1512;
  --ink-2: #10201B;
  --ink-3: #14261F;
  --edge: #1C3A2E;
  --green: #2FB566;
  --red: #C8382F;
  --orange: #E8792B;
  --blue: #4EA8FF;
  --paper: #EDE7DA;
  --stone: #9AA8A1;
  --stone-2: #6B7F76;
  --clay: #A8644A;

  --wrap: 1320px;
  --gutter: clamp(16px, 3.5vw, 40px);
  --head-h: 76px;
  --gap: 24px;

  --hard: 6px 0 0 0 rgba(28, 58, 46, .95);
  --hard-blue: 6px 0 0 0 rgba(78, 168, 255, .45);

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

  --t-fast: 140ms;
  --t-mid: 240ms;
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(28, 58, 46, .34) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 58, 46, .22) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  background-position: center top;
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.02em;
  text-transform: uppercase;
  color: var(--paper);
}

h1 { font-size: clamp(2rem, 5.2vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.75rem); }
h3 { font-size: clamp(1.15rem, 1.8vw, 1.5rem); letter-spacing: -.01em; }
h4 { font-size: 1.05rem; letter-spacing: -.01em; }

p { max-width: 74ch; }

strong { font-weight: 700; }

.num,
.card__value,
.table .num,
.foot-contact__val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

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

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

main {
  display: block;
  padding-top: var(--head-h);
}

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 900;
  transform: translateY(-240%);
  padding: 12px 18px;
  background: var(--green);
  color: #05170E;
  border: 2px solid #05170E;
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  transition: transform var(--t-fast) ease;
}

.skip-link:focus { transform: translateY(0); }

/* ---------- 6. 头部 ---------- */
.site-head {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 600;
  color: var(--paper);
}

.site-head__bar {
  position: relative;
  background-image: linear-gradient(180deg, rgba(11, 21, 18, .95) 0%, rgba(11, 21, 18, .6) 62%, rgba(11, 21, 18, 0) 100%);
  transition: background-color var(--t-mid) ease, border-color var(--t-mid) ease;
}

.site-head.is-stuck .site-head__bar {
  background-color: var(--ink-2);
  background-image: none;
  border-bottom: 1px solid var(--edge);
}

.site-head__inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 28px);
  min-height: var(--head-h);
  padding-block: 12px;
}

/* 品牌 */
.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  flex: 0 0 auto;
  padding-left: 12px;
  border-left: 3px solid var(--green);
  line-height: 1;
}

.wordmark {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.3rem;
  letter-spacing: -.01em;
  text-transform: uppercase;
  line-height: 1;
  color: var(--paper);
  white-space: nowrap;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--stone);
}

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

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 30px);
}

.site-nav__item { position: relative; }

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 6px 0;
  font-size: .96rem;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--stone);
  white-space: nowrap;
  transition: color var(--t-fast) ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--green);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-fast) ease;
}

.site-nav__link:hover { color: var(--paper); }

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

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

/* 工具区 */
.site-head__tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.tool-link {
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  padding: 9px 12px;
  border: 1px solid var(--edge);
  color: var(--stone);
  white-space: nowrap;
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease, background-color var(--t-fast) ease;
}

.tool-link:hover {
  color: var(--paper);
  border-color: var(--green);
}

.tool-link--accent {
  color: var(--paper);
  border-color: rgba(47, 181, 102, .6);
  background-color: rgba(47, 181, 102, .12);
}

.tool-link--accent:hover {
  background-color: rgba(47, 181, 102, .22);
  border-color: var(--green);
}

/* 菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 10px 14px;
  border: 1px solid var(--edge);
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--paper);
  transition: border-color var(--t-fast) ease, color var(--t-fast) ease;
}

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

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 20px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform var(--t-fast) ease, opacity var(--t-fast) ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 滚动进度 */
.head-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--t-mid) ease;
}

.site-head.is-stuck .head-progress { opacity: 1; }

.head-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--green) 0%, var(--blue) 100%);
  will-change: transform;
}

/* ---------- 7. 页脚 ---------- */
.site-foot {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  background-color: var(--ink-2);
  border-top: 2px solid var(--edge);
  color: var(--stone);
  font-size: .94rem;
}

.site-foot__inner { padding-block: clamp(40px, 6vw, 72px) 28px; }

.foot-top {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 2fr);
  gap: clamp(28px, 5vw, 72px);
  padding-bottom: clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--edge);
}

.foot-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.foot-brand .wordmark { font-size: clamp(1.4rem, 2.4vw, 1.9rem); }

.foot-brand__line {
  max-width: 40ch;
  font-size: .92rem;
  line-height: 1.7;
  color: var(--stone);
}

.foot-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.foot-col__title {
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--edge);
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--paper);
}

.foot-list li + li { margin-top: 10px; }

.foot-list a {
  color: var(--stone);
  transition: color var(--t-fast) ease;
}

.foot-list a:hover {
  color: var(--paper);
  text-decoration: underline;
  text-decoration-color: var(--green);
  text-underline-offset: 4px;
}

.foot-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 32px;
  margin-top: clamp(24px, 3vw, 36px);
  font-size: .84rem;
}

.foot-contact__item { display: inline-flex; align-items: baseline; gap: 8px; }

.foot-contact__key {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--stone-2);
}

.foot-contact__val { color: var(--paper); }

.foot-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 32px);
  padding-top: 20px;
  border-top: 1px solid var(--edge);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--stone-2);
}

.foot-legal a { color: var(--stone); }
.foot-legal a:hover { color: var(--paper); }

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border: 2px solid var(--paper);
  background-color: transparent;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  box-shadow: var(--hard);
  transition: transform var(--t-fast) ease, box-shadow var(--t-mid) ease,
              border-color var(--t-fast) ease, color var(--t-fast) ease, background-color var(--t-fast) ease;
}

.btn:hover,
.btn:focus-visible {
  border-color: var(--blue);
  color: var(--blue);
  box-shadow: var(--hard-blue);
  transform: translateX(-2px);
}

.btn--solid {
  background-color: var(--green);
  border-color: var(--green);
  color: #05170E;
}

.btn--solid:hover,
.btn--solid:focus-visible {
  background-color: var(--blue);
  border-color: var(--blue);
  color: #05170E;
  box-shadow: var(--hard-blue);
}

.btn--ghost { border-color: var(--edge); color: var(--paper); }
.btn--ghost:hover,
.btn--ghost:focus-visible { border-color: var(--green); color: var(--paper); box-shadow: var(--hard); }

/* ---------- 9. 面包屑 ---------- */
.crumbs { margin-bottom: clamp(16px, 2.5vw, 28px); }

.crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--stone-2);
}

.crumbs__list li { display: inline-flex; align-items: center; gap: 8px; }
.crumbs__list li + li::before { content: "/"; color: var(--edge); }
.crumbs__list a { color: var(--stone); }
.crumbs__list a:hover { color: var(--blue); }
.crumbs__list [aria-current="page"] { color: var(--paper); }

/* ---------- 10. 正文 ---------- */
.prose { max-width: 74ch; color: var(--paper); }
.prose > * + * { margin-top: 1.2em; }
.prose h2 { margin-top: 2em; }
.prose h3 { margin-top: 1.6em; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose ul li { position: relative; list-style: none; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: -1.3em;
  top: .82em;
  width: 9px;
  height: 2px;
  background: var(--green);
}
.prose ol { list-style: decimal; }
.prose ol li { padding-left: .2em; }
.prose a { color: var(--blue); border-bottom: 1px solid rgba(78, 168, 255, .4); }
.prose a:hover { border-bottom-color: var(--blue); }
.prose blockquote {
  padding-left: 18px;
  border-left: 3px solid var(--clay);
  color: var(--stone);
}
.prose__lead { font-size: 1.12rem; line-height: 1.7; color: var(--stone); }

/* ---------- 11. 章节头 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 14px;
  margin-bottom: clamp(20px, 3vw, 32px);
  border-bottom: 1px solid var(--edge);
}

.section-head__title { font-size: clamp(1.5rem, 3vw, 2.4rem); }

.section-head__meta {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--stone);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--green);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: currentColor;
}

.divider {
  height: 1px;
  border: 0;
  background: var(--edge);
  margin-block: clamp(24px, 4vw, 48px);
}

/* ---------- 12. 网格与卡片 ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

.grid--bento { align-items: start; }

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-6 { grid-column: span 6; }
.span-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(16px, 2vw, 24px);
  background-color: var(--ink-2);
  border: 2px solid var(--edge);
  box-shadow: var(--hard);
  transition: border-color var(--t-mid) ease, box-shadow var(--t-mid) ease, transform var(--t-mid) ease;
}

.card:hover,
.card:focus-within {
  border-color: var(--blue);
  box-shadow: var(--hard-blue);
  transform: translateX(-2px);
}

.card__label {
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--stone);
}

.card__value {
  font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--paper);
}

.card__value--green { color: var(--green); }
.card__value--blue { color: var(--blue); }

.card__note {
  font-size: .84rem;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 13. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 3px 9px;
  border: 1px solid var(--edge);
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--stone);
  white-space: nowrap;
}

.tag--green { color: var(--green); border-color: rgba(47, 181, 102, .5); background-color: rgba(47, 181, 102, .1); }
.tag--orange { color: var(--orange); border-color: rgba(232, 121, 43, .5); background-color: rgba(232, 121, 43, .1); }
.tag--blue { color: var(--blue); border-color: rgba(78, 168, 255, .5); background-color: rgba(78, 168, 255, .1); }
.tag--clay { color: var(--clay); border-color: rgba(168, 100, 74, .6); background-color: rgba(168, 100, 74, .12); }

.tag--red {
  color: var(--paper);
  border-color: rgba(200, 56, 47, .6);
  background-color: rgba(200, 56, 47, .14);
}

.tag--red::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--red);
}

/* ---------- 14. 净胜球差值条 ---------- */
.diffbar {
  position: relative;
  height: 12px;
  background-color: var(--ink);
  border: 1px solid var(--edge);
  overflow: hidden;
}

.diffbar__mid {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--stone-2);
}

.diffbar__fill {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 50%;
  background: var(--blue);
  transform: scaleX(var(--v, 0));
  transition: transform 420ms cubic-bezier(.22, .7, .3, 1);
}

.diffbar__fill[data-side="right"] { left: 50%; transform-origin: left center; }
.diffbar__fill[data-side="left"] { right: 50%; left: auto; transform-origin: right center; background: var(--clay); }

/* ---------- 15. 分段控件 ---------- */
.tabs { display: block; }

.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: 1px solid var(--edge);
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.tabs__btn {
  padding: 10px 16px;
  border: 1px solid transparent;
  border-bottom: 0;
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--stone);
  transition: color var(--t-fast) ease, background-color var(--t-fast) ease, box-shadow var(--t-fast) ease;
}

.tabs__btn:hover { color: var(--paper); background-color: rgba(28, 58, 46, .5); }

.tabs__btn[aria-selected="true"] {
  color: var(--paper);
  background-color: var(--ink-2);
  border-color: var(--edge);
  box-shadow: inset 0 -2px 0 0 var(--blue);
}

.tabs__panel { padding-top: 4px; }
.tabs__panel[hidden] { display: none; }

/* ---------- 16. 图片容器 ---------- */
.figure { display: block; margin: 0; }

.figure__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background-color: var(--ink-2);
  background-image: linear-gradient(145deg, rgba(47, 181, 102, .14), rgba(11, 21, 18, .92) 62%);
  border: 2px solid var(--edge);
}

.figure__img,
.figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.8) contrast(1.05) brightness(.9);
}

.figure__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(237, 231, 218, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(237, 231, 218, .06) 1px, transparent 1px);
  background-size: 32px 32px;
}

.figure__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 6px 12px;
  background-color: var(--ink);
  border-top: 1px solid var(--edge);
  border-right: 1px solid var(--edge);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--paper);
}

.figure__cap {
  margin-top: 10px;
  font-size: .82rem;
  line-height: 1.65;
  color: var(--stone);
}

.figure--wide .figure__media { aspect-ratio: 21 / 9; }
.figure--tall .figure__media { aspect-ratio: 4 / 5; }

/* ---------- 17. 表格 ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--edge);
  background-color: var(--ink-2);
}

.table {
  min-width: 560px;
  font-size: .92rem;
}

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

.table th {
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--stone);
  background-color: var(--ink-3);
}

.table tbody tr:last-child td { border-bottom: 0; }
.table tbody tr:hover { background-color: rgba(28, 58, 46, .4); }
.table .num { text-align: right; }

/* ---------- 18. 显现动效 ---------- */
.has-js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 320ms ease, transform 320ms cubic-bezier(.22, .7, .3, 1);
  transition-delay: calc(var(--i, 0) * 40ms);
}

.has-js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 19. 响应式 ---------- */
@media (max-width: 1080px) {
  .span-3 { grid-column: span 6; }
  .span-9 { grid-column: span 12; }
}

@media (max-width: 960px) {
  .site-head__tools { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    top: var(--head-h);
    left: 0;
    right: 0;
    margin: 0;
    max-height: calc(100vh - var(--head-h));
    overflow-y: auto;
    padding: 10px var(--gutter) 22px;
    background-color: var(--ink-2);
    border-top: 1px solid var(--edge);
    border-bottom: 2px solid var(--edge);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity var(--t-fast) ease, transform var(--t-fast) ease, visibility 0s linear var(--t-fast);
  }

  .site-nav[data-open="true"] {
    visibility: visible;
    opacity: 1;
    transform: none;
    transition-delay: 0s;
  }

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

  .site-nav__item { border-bottom: 1px solid var(--edge); }
  .site-nav__item:last-child { border-bottom: 0; }

  .site-nav__link {
    display: block;
    padding: 14px 2px;
    font-size: 1.05rem;
    font-weight: 700;
  }

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

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

  .site-nav__link[aria-current="page"]::before {
    content: "";
    display: inline-block;
    width: 8px;
    height: 8px;
    margin-right: 10px;
    background: var(--green);
  }

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

  .span-4 { grid-column: span 6; }
  .span-6 { grid-column: span 12; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }

  .site-nav__link { font-size: 1rem; }

  .span-3,
  .span-4,
  .span-6,
  .span-9,
  .span-12 { grid-column: 1 / -1; }

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

  .grid { gap: 16px; }

  .btn { width: 100%; justify-content: center; }
}

/* ---------- 20. 无障碍与动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  .has-js .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .card,
  .btn,
  .tool-link,
  .site-nav,
  .site-nav__link,
  .site-nav__link::after,
  .head-progress,
  .head-progress__bar,
  .diffbar__fill,
  .tabs__btn,
  .nav-toggle__bars i {
    transition: none !important;
  }

  .card:hover,
  .card:focus-within,
  .btn:hover,
  .btn:focus-visible { transform: none; }
}