/* ==========================================================================
   问鼎会馆 · /assets/site.css
   共享外壳：重置 / 变量 / 中文排版 / 刊头 / 页脚 / 通用组件
   ========================================================================== */

/* 01. 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, 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; }

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

[hidden] { display: none !important; }

::selection { background: var(--bronze); color: #120D07; }

/* 02. 设计变量
   ------------------------------------------------------------------------ */
:root {
  /* 色彩：近单色玄墨体系 + 三点强调 */
  --ink: #0F0D0B;
  --ink-deep: #191512;
  --ink-soft: #2B2520;
  --bronze: #C9A15B;
  --bronze-bright: #E8C98C;
  --cinnabar: #C94832;
  --cinnabar-deep: #A83224;
  --stone: #5C8A93;
  --stone-deep: #2F555C;
  --paper: #F1E8D6;
  --paper-2: #D6C9B2;

  --line: rgba(201, 161, 91, .30);
  --line-soft: rgba(241, 232, 214, .12);
  --text: rgba(241, 232, 214, .86);
  --text-dim: rgba(241, 232, 214, .62);

  /* 尺度 */
  --shell: 1240px;
  --gutter: clamp(1.05rem, 4vw, 3rem);
  --r: 2px;
  --dur: .24s;

  /* 字体 */
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;
}

/* 03. 基础排版
   ------------------------------------------------------------------------ */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(130% 70% at 50% -20%, rgba(201, 161, 91, .10), transparent 62%),
    repeating-linear-gradient(0deg, rgba(241, 232, 214, .022) 0 1px, transparent 1px 4px);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: clamp(1rem, .96rem + .18vw, 1.0625rem);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: .02em;
  color: var(--paper);
}

h1 { font-size: clamp(2.4rem, 6vw, 4.4rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.9rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.6rem); }

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

/* 04. 布局与通用工具
   ------------------------------------------------------------------------ */
.wd-shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wd-section {
  position: relative;
  padding-block: clamp(2.4rem, 6vw, 5rem);
}

.wd-mono {
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 500;
  letter-spacing: .14em;
  font-variant-numeric: tabular-nums;
}

.wd-seal {
  display: inline-block;
  width: .5rem;
  height: .5rem;
  margin-right: .5rem;
  background: var(--cinnabar);
  border-radius: 1px;
  vertical-align: baseline;
  transform: translateY(-1px);
}

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

.wd-eyebrow {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .24em;
  color: var(--bronze);
}

.wd-lede {
  max-width: 56ch;
  font-size: clamp(1.05rem, 1rem + .5vw, 1.3rem);
  line-height: 1.7;
  color: rgba(241, 232, 214, .9);
}

.wd-prose {
  max-width: 68ch;
  color: var(--text);
}

.wd-prose > * + * { margin-top: 1.1em; }

.wd-prose h2 {
  margin-top: 2em;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
}

.wd-prose h3 {
  margin-top: 1.8em;
  font-size: clamp(1.15rem, 2vw, 1.35rem);
}

.wd-prose ul { list-style: disc; padding-left: 1.35em; }
.wd-prose ol { list-style: decimal; padding-left: 1.35em; }
.wd-prose li + li { margin-top: .45em; }
.wd-prose a {
  color: var(--bronze-bright);
  border-bottom: 1px solid var(--line);
}
.wd-prose a:hover { border-bottom-color: var(--bronze-bright); }

/* 05. 网格
   ------------------------------------------------------------------------ */
.wd-grid {
  display: grid;
  gap: clamp(1rem, 3vw, 2rem);
}

.wd-grid--split,
.wd-grid--archive {
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 900px) {
  .wd-grid--split { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
  .wd-grid--archive { grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); }
}

/* 06. 按钮
   ------------------------------------------------------------------------ */
.wd-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .75rem 1.35rem;
  background: var(--bronze);
  color: #150F08;
  border: 1px solid var(--bronze);
  border-radius: var(--r);
  font-size: .92rem;
  font-weight: 500;
  letter-spacing: .08em;
  line-height: 1.3;
  cursor: pointer;
  transition: background var(--dur) ease, border-color var(--dur) ease, color var(--dur) ease;
}

.wd-btn:hover { background: var(--bronze-bright); border-color: var(--bronze-bright); color: #100C07; }

.wd-btn--ghost {
  background: transparent;
  color: var(--bronze-bright);
  border-color: var(--line);
}

.wd-btn--ghost:hover {
  background: rgba(201, 161, 91, .12);
  border-color: var(--bronze);
  color: var(--paper);
}

.wd-btn--seal {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: var(--paper);
}

.wd-btn--seal:hover { background: var(--cinnabar-deep); border-color: var(--cinnabar-deep); color: var(--paper); }

/* 07. 面包屑
   ------------------------------------------------------------------------ */
.wd-crumb {
  padding-block: 1rem;
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--text-dim);
}

.wd-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
}

.wd-crumb li {
  display: inline-flex;
  align-items: center;
}

.wd-crumb li + li::before {
  content: "/";
  margin-right: .45rem;
  color: var(--bronze);
  opacity: .6;
}

.wd-crumb a { color: inherit; }
.wd-crumb a:hover { color: var(--bronze-bright); }
.wd-crumb [aria-current="page"] { color: var(--bronze-bright); }

/* 08. 框景 / 图片容器
   ------------------------------------------------------------------------ */
.wd-frame {
  position: relative;
  padding: clamp(1rem, 3vw, 2.25rem);
  border: 1px solid var(--line);
  border-radius: var(--r);
  background-color: rgba(25, 21, 18, .55);
  background-image:
    linear-gradient(var(--bronze), var(--bronze)), linear-gradient(var(--bronze), var(--bronze)),
    linear-gradient(var(--bronze), var(--bronze)), linear-gradient(var(--bronze), var(--bronze)),
    linear-gradient(var(--bronze), var(--bronze)), linear-gradient(var(--bronze), var(--bronze)),
    linear-gradient(var(--bronze), var(--bronze)), linear-gradient(var(--bronze), var(--bronze));
  background-repeat: no-repeat;
  background-size:
    16px 1px, 1px 16px,
    16px 1px, 1px 16px,
    16px 1px, 1px 16px,
    16px 1px, 1px 16px;
  background-position:
    left top, left top,
    right top, right top,
    left bottom, left bottom,
    right bottom, right bottom;
}

.wd-media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line-soft);
  border-radius: var(--r);
  background:
    linear-gradient(160deg, rgba(201, 161, 91, .14), rgba(15, 13, 11, .9) 62%),
    var(--ink-soft);
}

.wd-media--wide { aspect-ratio: 21 / 9; }
.wd-media--tall { aspect-ratio: 4 / 5; }
.wd-media--square { aspect-ratio: 1 / 1; }

.wd-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.86) contrast(1.04);
}

/* 09. 档案卡与标签
   ------------------------------------------------------------------------ */
.wd-card {
  padding: clamp(1rem, 2.5vw, 1.6rem);
  background: rgba(43, 37, 32, .55);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--bronze);
  border-radius: var(--r);
}

.wd-card--rule { border-left-color: var(--cinnabar); }
.wd-card--resource { border-left-color: var(--stone); }

.wd-tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .2rem .55rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--bronze-bright);
  white-space: nowrap;
}

.wd-tag--rule { color: #F0A99C; border-color: rgba(201, 72, 50, .55); }
.wd-tag--res { color: #A9CDD4; border-color: rgba(92, 138, 147, .55); }

/* 10. 对照表
   ------------------------------------------------------------------------ */
.wd-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line-soft);
  border-radius: var(--r);
  background: rgba(25, 21, 18, .6);
  -webkit-overflow-scrolling: touch;
}

.wd-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: .92rem;
}

.wd-table th,
.wd-table td {
  padding: .75rem 1rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-soft);
}

.wd-table thead th {
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 500;
  letter-spacing: .12em;
  color: var(--bronze);
  background: rgba(43, 37, 32, .8);
  white-space: nowrap;
}

.wd-table tbody tr:hover { background: rgba(201, 161, 91, .09); }
.wd-table tbody tr:hover td:first-child { box-shadow: inset 2px 0 0 var(--bronze); }

.wd-table th:first-child,
.wd-table td:first-child {
  position: sticky;
  left: 0;
  z-index: 1;
  background: var(--ink-deep);
  min-width: 9rem;
}

.wd-table thead th:first-child { background: var(--ink-soft); }

/* 11. 章节目录
   ------------------------------------------------------------------------ */
.wd-toc {
  position: sticky;
  top: 1.25rem;
  padding-left: 1rem;
  border-left: 1px solid var(--line);
}

.wd-toc__title {
  margin-bottom: .8rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--bronze);
}

.wd-toc__list { display: grid; gap: .2rem; }

.wd-toc__link {
  display: block;
  padding: .3rem 0 .3rem .7rem;
  border-left: 2px solid transparent;
  font-size: .86rem;
  color: var(--text-dim);
  transition: color var(--dur) ease, border-color var(--dur) ease;
}

.wd-toc__link:hover { color: var(--paper); }

.wd-toc__link[aria-current] {
  color: var(--bronze-bright);
  border-left-color: var(--cinnabar);
}

@media (max-width: 899px) {
  .wd-toc { position: static; }
}

/* 12. 共享页头
   ------------------------------------------------------------------------ */
.wd-skip {
  position: fixed;
  left: 1rem;
  top: .6rem;
  z-index: 130;
  padding: .6rem 1.05rem;
  background: var(--bronze);
  color: #120D07;
  font-size: .85rem;
  letter-spacing: .08em;
  border-radius: var(--r);
  transform: translateY(-180%);
  transition: transform .2s ease;
}

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

.wd-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  z-index: 120;
  background: rgba(241, 232, 214, .08);
  pointer-events: none;
}

.wd-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--stone), var(--bronze), var(--cinnabar));
}

.wd-header {
  position: relative;
  background: linear-gradient(180deg, #0B0908 0%, #100D0A 100%);
  border-bottom: 1px solid var(--line);
}

/* 效用条 */
.wd-utility { border-bottom: 1px solid var(--line-soft); }

.wd-utility__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem 1.25rem;
  padding-block: .55rem;
}

.wd-utility__meta {
  font-size: .7rem;
  color: var(--text-dim);
  line-height: 1.4;
}

.wd-utility__meta--version { color: var(--paper-2); }

.wd-utility__link {
  padding: .3rem .75rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--bronze-bright);
  transition: background var(--dur) ease, color var(--dur) ease, border-color var(--dur) ease;
}

.wd-utility__link:hover {
  background: var(--bronze);
  border-color: var(--bronze);
  color: #120D07;
}

/* 居中刊头 */
.wd-masthead { border-bottom: 1px solid var(--line); }

.wd-masthead__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  padding-block: clamp(.9rem, 2.2vw, 1.5rem);
}

.wd-brand {
  grid-column: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-inline: clamp(.4rem, 2vw, 1.5rem);
}

.wd-brand__name {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.85rem, 5vw, 3.1rem);
  line-height: 1.04;
  letter-spacing: .16em;
  text-indent: .16em;
  color: var(--paper);
  text-shadow: 0 1px 0 rgba(0, 0, 0, .6), 0 0 26px rgba(201, 161, 91, .18);
  transition: color var(--dur) ease;
}

.wd-brand:hover .wd-brand__name { color: var(--bronze-bright); }

.wd-brand__sub {
  margin-top: .55rem;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .32em;
  text-indent: .32em;
  color: var(--bronze);
  white-space: nowrap;
}

.wd-masthead__aside {
  grid-column: 3;
  justify-self: end;
  align-self: end;
  padding-bottom: .3rem;
  font-size: .68rem;
  color: var(--text-dim);
  white-space: nowrap;
}

/* 移动栏目按钮 */
.wd-nav-toggle {
  grid-column: 1;
  justify-self: start;
  display: none;
  align-items: center;
  gap: .5rem;
  padding: .45rem .7rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  color: var(--bronze-bright);
  font-size: .78rem;
  letter-spacing: .14em;
  cursor: pointer;
}

.wd-nav-toggle:hover { background: rgba(201, 161, 91, .12); }

.wd-nav-toggle__glyph {
  position: relative;
  display: block;
  width: 1.05rem;
  height: 2px;
  background: currentColor;
}

.wd-nav-toggle__glyph::before,
.wd-nav-toggle__glyph::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) ease, opacity var(--dur) ease;
}

.wd-nav-toggle__glyph::before { top: -6px; }
.wd-nav-toggle__glyph::after { top: 6px; }

[data-nav-toggle][aria-expanded="true"] .wd-nav-toggle__glyph { background: transparent; }
[data-nav-toggle][aria-expanded="true"] .wd-nav-toggle__glyph::before { transform: translateY(6px) rotate(45deg); }
[data-nav-toggle][aria-expanded="true"] .wd-nav-toggle__glyph::after { transform: translateY(-6px) rotate(-45deg); }

/* 栏目索引 */
.wd-nav {
  background: rgba(11, 9, 8, .72);
  border-bottom: 1px solid var(--line);
}

.wd-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: clamp(.35rem, 2.2vw, 2.1rem);
  padding-block: .8rem;
}

.wd-nav__item { display: block; }

.wd-nav__link {
  position: relative;
  display: inline-block;
  padding: .3rem .15rem;
  font-size: .95rem;
  letter-spacing: .08em;
  color: rgba(241, 232, 214, .78);
  transition: color var(--dur) ease;
}

.wd-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .05rem;
  height: 1px;
  background: var(--bronze-bright);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--dur) ease;
}

.wd-nav__link:hover,
.wd-nav__link:focus-visible { color: var(--bronze-bright); }

.wd-nav__link:hover::after,
.wd-nav__link:focus-visible::after { transform: scaleX(1); }

.wd-nav__link[aria-current="page"] { color: var(--bronze-bright); }

.wd-nav__link[aria-current="page"]::after {
  height: 2px;
  background: var(--cinnabar);
  transform: scaleX(1);
}

/* 13. 共享页脚
   ------------------------------------------------------------------------ */
.wd-footer {
  position: relative;
  margin-top: clamp(2.5rem, 6vw, 5rem);
  background: var(--ink-deep);
  border-top: 1px solid rgba(201, 161, 91, .38);
}

.wd-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.4rem);
  padding-block: clamp(2.2rem, 5vw, 4rem);
}

.wd-footer__mark {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: .12em;
  color: var(--paper);
}

.wd-footer__tag {
  margin-top: .6rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--bronze);
}

.wd-footer__note {
  max-width: 30ch;
  margin-top: 1rem;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.wd-footer__cta { margin-top: 1.4rem; }

.wd-footer__cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.9rem 1.2rem;
}

.wd-footer__col { min-width: 0; }

.wd-footer__title {
  position: relative;
  margin-bottom: .9rem;
  padding-left: .8rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--bronze);
  line-height: 1.4;
}

.wd-footer__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: .45em;
  width: .38rem;
  height: .38rem;
  background: var(--cinnabar);
  border-radius: 1px;
}

.wd-footer__list { display: grid; gap: .5rem; }

.wd-footer__link {
  display: inline-block;
  font-size: .88rem;
  line-height: 1.6;
  color: rgba(241, 232, 214, .76);
  transition: color var(--dur) ease;
}

.wd-footer__link:hover,
.wd-footer__link:focus-visible { color: var(--bronze-bright); }

.wd-footer__line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .4rem .5rem;
  margin-bottom: .6rem;
  font-size: .85rem;
  line-height: 1.65;
  color: rgba(241, 232, 214, .78);
}

.wd-footer__label {
  flex: 0 0 auto;
  font-size: .7rem;
  color: var(--stone);
}

.wd-footer__value {
  flex: 1 1 12ch;
  min-width: 0;
  word-break: break-word;
}

.wd-copy {
  flex: 0 0 auto;
  padding: .12rem .45rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--r);
  font-size: .68rem;
  letter-spacing: .08em;
  color: var(--bronze);
  cursor: pointer;
  transition: background var(--dur) ease, color var(--dur) ease, border-color var(--dur) ease;
}

.wd-copy:hover {
  background: var(--bronze);
  border-color: var(--bronze);
  color: #120D07;
}

.wd-copy[data-copied] {
  background: var(--bronze-bright);
  border-color: var(--bronze-bright);
  color: #100C07;
}

.wd-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem 1.5rem;
  padding-block: 1.15rem;
  border-top: 1px solid var(--line-soft);
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--text-dim);
}

.wd-footer__copy { line-height: 1.6; }

.wd-footer__served {
  font-size: .68rem;
  letter-spacing: .16em;
  color: rgba(241, 232, 214, .5);
}

/* 返回顶部 */
.wd-totop {
  position: fixed;
  right: clamp(.8rem, 3vw, 1.6rem);
  bottom: clamp(.8rem, 3vw, 1.6rem);
  z-index: 110;
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .5rem .9rem .5rem .55rem;
  background: rgba(25, 21, 18, .94);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--paper);
  font-size: .72rem;
  letter-spacing: .14em;
  cursor: pointer;
  box-shadow: 0 10px 26px rgba(0, 0, 0, .45);
  transition: border-color var(--dur) ease, color var(--dur) ease;
}

.wd-totop:hover {
  border-color: var(--bronze);
  color: var(--bronze-bright);
}

.wd-totop__ring {
  position: relative;
  display: block;
  width: 1.2rem;
  height: 1.2rem;
  border-radius: 50%;
  background: conic-gradient(var(--bronze-bright) calc(var(--wd-scroll, 0) * 1%), rgba(241, 232, 214, .16) 0);
}

.wd-totop__ring::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--ink-deep);
}

.wd-totop__text { line-height: 1; }

/* 14. 断点
   ------------------------------------------------------------------------ */
@media (max-width: 899px) {
  .wd-masthead__aside { display: none; }

  html.wd-js .wd-nav-toggle { display: inline-flex; }

  html.wd-js .wd-nav { display: none; }

  html.wd-js .wd-nav[data-open] {
    display: block;
    background: var(--ink-deep);
    border-bottom: 1px solid var(--line);
  }

  .wd-nav__list {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding-block: .2rem .9rem;
  }

  .wd-nav__link {
    display: block;
    padding: .85rem .2rem;
    border-bottom: 1px solid var(--line-soft);
    font-size: 1rem;
  }

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

  .wd-nav__link[aria-current="page"] {
    padding-left: .8rem;
    box-shadow: inset 2px 0 0 var(--cinnabar);
  }

  .wd-footer__legal { padding-bottom: 4.5rem; }
}

@media (max-width: 639px) {
  .wd-utility__meta:first-child { display: none; }

  .wd-utility__inner { justify-content: space-between; }

  .wd-brand__sub { font-size: .6rem; letter-spacing: .22em; text-indent: .22em; }

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

  .wd-footer__note { max-width: none; }

  .wd-totop { padding: .5rem .75rem .5rem .5rem; font-size: .68rem; }
}

@media (min-width: 900px) {
  .wd-footer__inner { grid-template-columns: minmax(220px, 1fr) minmax(0, 2.5fr); }
  .wd-footer__cols { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 640px) and (max-width: 899px) {
  .wd-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .wd-footer__col--contact { grid-column: 1 / -1; }
}

/* 15. 减少动态效果
   ------------------------------------------------------------------------ */
@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;
  }
}