/* =========================================================
   1973棋牌局 · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 页头 / 页脚 / 通用组件
   ========================================================= */

/* ---------- 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, ul, ol, li, dl, dd, dt,
figure, figcaption, blockquote, pre, table {
  margin: 0;
}

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

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

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

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

details > summary { list-style: none; }
details > summary::-webkit-details-marker { display: none; }

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

/* ---------- 变量 ---------- */
:root {
  /* 品牌色 */
  --ink-green: #0E3B2E;
  --ink-green-deep: #08251D;
  --amber: #D99A3D;
  --gold-old: #B08A3E;
  --vermilion: #D8452B;
  --paper: #F6F1E7;
  --cream-card: #EFE6D6;
  --charcoal: #1C1A17;
  --warm-gray: #6B6358;
  --gold-line: #C9B99B;
  --amber-dark: #8A5A1F;

  /* 字体 */
  --font-display: Georgia, "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  --font-body: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;

  /* 尺寸 */
  --shell-max: 1200px;
  --shell-pad: 20px;
  --measure: 42em;
  --radius: 0px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: 160ms;

  /* 层级 */
  --z-progress: 300;
  --z-header: 100;
  --z-skip: 400;
}

/* ---------- 基础与中文排版 ---------- */
body {
  background-color: var(--paper);
  background-image:
    repeating-linear-gradient(0deg, rgba(176, 138, 62, .055) 0 1px, transparent 1px 4px);
  background-attachment: fixed;
  color: var(--charcoal);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: .012em;
  color: var(--charcoal);
}

h1 { font-size: clamp(36px, 6.2vw, 64px); }
h2 { font-size: clamp(28px, 3.6vw, 40px); }
h3 { font-size: clamp(20px, 2.4vw, 26px); }
h4 { font-size: 18px; line-height: 1.5; }

p { text-wrap: pretty; }

::selection {
  background: var(--amber);
  color: var(--ink-green-deep);
}

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

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
}

/* ---------- 跳至正文 ---------- */
.skip-link {
  position: fixed;
  left: 14px;
  top: -80px;
  z-index: var(--z-skip);
  display: inline-block;
  padding: 11px 18px;
  background: var(--vermilion);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .05em;
  border: 1px solid #A8311D;
  transition: top var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 14px;
  outline: none;
}

/* ---------- 布局容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--shell-pad);
}

/* =========================================================
   页头
   ========================================================= */
.site-header { position: relative; z-index: var(--z-header); }

/* 版本信息带 */
.version-band {
  background: var(--ink-green-deep);
  border-bottom: 1px solid rgba(201, 185, 155, .3);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .07em;
  color: rgba(201, 185, 155, .92);
}

.version-band__inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 12px;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 9px var(--shell-pad);
}

.version-band__item { white-space: nowrap; }

.version-band__version { color: var(--amber); font-weight: 700; }

.version-band__icp { color: rgba(201, 185, 155, .7); }

.version-band__sep { color: rgba(201, 185, 155, .45); }

.version-band__state {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--amber);
  white-space: nowrap;
}

.version-band__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--vermilion);
  box-shadow: 0 0 0 3px rgba(216, 69, 43, .22);
  flex: none;
}

/* 书脊主体 */
.masthead {
  position: sticky;
  top: 0;
  background: var(--ink-green);
  color: var(--paper);
  border-bottom: 3px solid var(--amber);
  box-shadow: 0 1px 0 rgba(8, 37, 29, .5);
}

.masthead__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 18px;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 14px var(--shell-pad);
}

/* 品牌块 */
.brandblock { margin-right: auto; min-width: 0; }

.brandblock__link {
  display: flex;
  align-items: center;
  gap: 13px;
  min-height: 44px;
}

.brandblock__seal {
  flex: none;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ink-green-deep);
  background: var(--amber);
  border: 1px solid var(--gold-old);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, .2);
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.brandblock__link:hover .brandblock__seal,
.brandblock__link:focus-visible .brandblock__seal {
  background: var(--vermilion);
  color: #fff;
}

.brandblock__text { min-width: 0; }

.brandblock__name {
  display: block;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: .05em;
  color: var(--paper);
}

.brandblock__domain {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: rgba(246, 241, 231, .6);
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 移动端索引按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 8px 14px;
  background: transparent;
  color: var(--paper);
  border: 1px solid rgba(201, 185, 155, .5);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

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

.nav-toggle[aria-expanded="true"] {
  background: var(--amber);
  color: var(--ink-green-deep);
  border-color: var(--gold-old);
}

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
  flex: none;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: currentColor;
}

.nav-toggle__text { white-space: nowrap; }

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  min-width: 0;
}

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

.site-nav__list a {
  display: inline-block;
  padding: 10px 12px;
  border-bottom: 2px solid transparent;
  border-left: 3px solid transparent;
  font-size: 15px;
  letter-spacing: .03em;
  white-space: nowrap;
  transition: color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.site-nav__list a:hover,
.site-nav__list a:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
  outline: none;
}

.site-nav__list a[aria-current="page"] {
  color: var(--ink-green-deep);
  background: var(--amber);
  border-bottom-color: var(--vermilion);
  font-weight: 700;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: 14px;
}

/* =========================================================
   通用按钮
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 18px;
  font-family: var(--font-body);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: .045em;
  line-height: 1.3;
  text-align: center;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.btn--amber {
  background: var(--amber);
  color: var(--ink-green-deep);
  border-color: var(--gold-old);
}
.btn--amber:hover,
.btn--amber:focus-visible {
  background: var(--amber-dark);
  color: var(--paper);
  border-color: var(--amber-dark);
  outline: none;
}

.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: rgba(201, 185, 155, .55);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--amber);
  color: var(--amber);
  outline: none;
}

.btn--solid {
  background: var(--ink-green);
  color: var(--paper);
  border-color: var(--ink-green);
}
.btn--solid:hover,
.btn--solid:focus-visible {
  background: var(--ink-green-deep);
  border-color: var(--amber);
  color: var(--amber);
  outline: none;
}

.btn--line {
  background: transparent;
  color: var(--ink-green);
  border-color: var(--ink-green);
}
.btn--line:hover,
.btn--line:focus-visible {
  background: var(--ink-green);
  color: var(--paper);
  outline: none;
}

.btn--alert {
  background: var(--vermilion);
  color: #fff;
  border-color: #A8311D;
}
.btn--alert:hover,
.btn--alert:focus-visible {
  background: #A8311D;
  border-color: #7E2415;
  outline: none;
}

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

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 4px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--warm-gray);
}

.breadcrumb a {
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--vermilion);
  border-bottom-color: var(--vermilion);
  outline: none;
}

.breadcrumb__sep { color: var(--gold-line); }

/* 展签 */
.plaque {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 12px;
  padding-bottom: 10px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--gold-line);
}

.plaque__no {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--vermilion);
}

.plaque__title {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: .02em;
}

.plaque__note {
  margin-left: auto;
  font-size: 13px;
  line-height: 1.6;
  color: var(--warm-gray);
}

/* 纸张卡片 */
.slip {
  position: relative;
  padding: 24px;
  background: var(--cream-card);
  border: 1px solid var(--gold-line);
  box-shadow: 4px 4px 0 rgba(14, 59, 46, .09),
              inset 0 1px 0 rgba(255, 255, 255, .75);
}

.slip--paper { background: var(--paper); }

.slip--dark {
  background: var(--ink-green);
  color: var(--paper);
  border-color: var(--gold-old);
  box-shadow: 4px 4px 0 rgba(8, 37, 29, .35);
}
.slip--dark h2,
.slip--dark h3,
.slip--dark h4 { color: var(--paper); }

/* 抽屉折叠面板 */
.drawer {
  background: var(--cream-card);
  border: 1px solid var(--gold-line);
  margin-bottom: 10px;
  transition: border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.drawer:hover { border-color: var(--gold-old); }

.drawer[open] {
  border-color: var(--amber);
  box-shadow: 3px 3px 0 rgba(176, 138, 62, .18);
}

.drawer__head {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  padding: 14px 18px;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--charcoal);
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.drawer__head:hover { background: rgba(217, 154, 61, .18); }

.drawer__head:focus-visible {
  outline: 3px solid var(--vermilion);
  outline-offset: -3px;
}

.drawer__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--vermilion);
  flex: none;
}

.drawer__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--vermilion);
  flex: none;
}

.drawer[open] .drawer__head::after { content: "\2212"; }

.drawer__body {
  padding: 4px 18px 20px;
  border-top: 1px dashed var(--gold-line);
  font-size: 16px;
  line-height: 1.8;
  color: var(--charcoal);
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--warm-gray);
  background: transparent;
  border: 1px solid var(--gold-line);
  white-space: nowrap;
}

.tag--live {
  color: var(--vermilion);
  border-color: var(--vermilion);
  background: rgba(216, 69, 43, .07);
}

.tag--amber {
  color: var(--amber-dark);
  border-color: var(--gold-old);
  background: rgba(217, 154, 61, .14);
}

/* 图片容器 */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--ink-green);
  border: 1px solid var(--gold-line);
  overflow: hidden;
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

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

.media-frame__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 11px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .09em;
  color: var(--ink-green-deep);
  background: var(--amber);
}

/* 作品说明牌 */
.caption {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--gold-line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--warm-gray);
}

/* 正文容器 */
.prose {
  max-width: var(--measure);
  font-size: 17px;
  line-height: 1.85;
}

.prose > * + * { margin-top: 1.05em; }

.prose h2 { margin-top: 1.7em; font-size: clamp(24px, 3vw, 32px); }
.prose h3 { margin-top: 1.4em; }

.prose ul > li,
.prose ol > li { margin-top: .5em; }

.prose ul > li {
  position: relative;
  padding-left: 1.25em;
}

.prose ul > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .82em;
  width: 10px;
  height: 1px;
  background: var(--gold-old);
}

.prose ol { list-style: decimal; padding-left: 1.5em; }
.prose ol > li::marker { color: var(--gold-old); font-family: var(--font-mono); }

.prose strong { color: var(--ink-green); }

.prose a {
  color: var(--amber-dark);
  border-bottom: 1px solid var(--gold-line);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.prose a:hover,
.prose a:focus-visible {
  color: var(--vermilion);
  border-bottom-color: var(--vermilion);
}

.prose blockquote {
  padding: 4px 0 4px 18px;
  border-left: 3px solid var(--amber);
  color: var(--warm-gray);
}

/* 网格 */
.split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}

.stack > * + * { margin-top: var(--stack-gap, 22px); }

/* 滚动进度 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--amber) 0%, var(--gold-old) 55%, var(--vermilion) 100%);
  z-index: var(--z-progress);
  pointer-events: none;
}

/* =========================================================
   页脚
   ========================================================= */
.site-footer {
  margin-top: 76px;
  background: var(--ink-green-deep);
  color: rgba(246, 241, 231, .82);
  border-top: 4px solid var(--amber);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 2fr) minmax(0, 1.05fr);
  gap: 44px 48px;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 56px var(--shell-pad) 42px;
}

/* 页脚品牌 */
.footer-brand { min-width: 0; }

.footer-brand__seal {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-green-deep);
  background: var(--amber);
  border: 1px solid var(--gold-old);
}

.footer-brand__name {
  margin-top: 14px;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--paper);
}

.footer-brand__summary {
  margin-top: 12px;
  max-width: 32em;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(246, 241, 231, .72);
}

.footer-brand__domain {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--amber);
  word-break: break-all;
}

/* 页脚栏目 */
.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 30px 24px;
  min-width: 0;
}

.footer-nav__col { min-width: 0; }

.footer-nav__title {
  padding-bottom: 8px;
  margin-bottom: 12px;
  border-bottom: 1px solid rgba(201, 185, 155, .3);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--amber);
}

.footer-nav__list li + li { margin-top: 2px; }

.footer-nav__list a {
  display: inline-block;
  padding: 6px 0;
  font-size: 15px;
  line-height: 1.6;
  color: rgba(246, 241, 231, .84);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-nav__list a:hover,
.footer-nav__list a:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
  outline: none;
}

/* 页脚联系 */
.footer-contact { min-width: 0; }

.footer-contact__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  padding: 9px 0;
  border-bottom: 1px solid rgba(201, 185, 155, .14);
  font-size: 14px;
  line-height: 1.7;
}

.footer-contact__key {
  flex: none;
  width: 5em;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .09em;
  color: var(--gold-old);
  padding-top: 3px;
}

.footer-contact__val {
  color: rgba(246, 241, 231, .86);
  word-break: break-word;
}

.footer-contact__note {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(246, 241, 231, .58);
}

/* 页脚底条 */
.footer-base {
  border-top: 1px solid rgba(201, 185, 155, .22);
  background: rgba(0, 0, 0, .18);
}

.footer-base__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 16px var(--shell-pad);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: rgba(246, 241, 231, .55);
}

.footer-base__icp { color: rgba(246, 241, 231, .7); }

.footer-base__spacer { flex: 1 1 auto; }

.footer-base__stamp { color: var(--amber); }

/* =========================================================
   响应式
   ========================================================= */

/* 中等桌面：压缩导航体量 */
@media (max-width: 1080px) {
  .site-nav__list a { padding: 9px 9px; font-size: 14px; }
  .nav-actions { gap: 8px; margin-left: 8px; }
  .nav-actions .btn { padding: 9px 12px; font-size: 13.5px; }
  .site-footer__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
  }
  .footer-contact { grid-column: 1 / -1; }
}

/* 平板与手机：导航折叠为索引抽屉 */
@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px var(--shell-pad) 22px;
    background: var(--ink-green-deep);
    border-top: 1px solid rgba(201, 185, 155, .3);
    border-bottom: 3px solid var(--amber);
    box-shadow: 0 20px 36px rgba(0, 0, 0, .34);
    max-height: calc(100vh - 80px);
    overflow-y: auto;
  }

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

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

  .site-nav__list li + li { border-top: 1px solid rgba(201, 185, 155, .14); }

  .site-nav__list a {
    display: block;
    width: 100%;
    padding: 14px 12px;
    font-size: 16.5px;
    border-bottom: 0;
    border-left: 3px solid transparent;
  }

  .site-nav__list a:hover,
  .site-nav__list a:focus-visible {
    color: var(--amber);
    border-bottom-color: transparent;
    border-left-color: var(--amber);
    background: rgba(217, 154, 61, .1);
  }

  .site-nav__list a[aria-current="page"] {
    background: rgba(217, 154, 61, .18);
    color: var(--amber);
    border-left-color: var(--vermilion);
    border-bottom-color: transparent;
  }

  .nav-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin: 18px 0 0;
  }

  .nav-actions .btn { width: 100%; padding: 13px 18px; font-size: 15px; }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-top: 46px;
  }

  .footer-contact { grid-column: auto; }
}

/* 非对称双栏在 920px 以上成立 */
@media (min-width: 920px) {
  .split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 52px;
  }
  .split--reverse { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
}

/* 手机 */
@media (max-width: 620px) {
  body { font-size: 16px; line-height: 1.78; }

  :root { --shell-pad: 16px; }

  .masthead__inner { gap: 10px; padding: 12px var(--shell-pad); }

  .brandblock__seal { width: 40px; height: 40px; font-size: 15px; }
  .brandblock__name { font-size: 18px; }
  .brandblock__domain { font-size: 10.5px; }

  .nav-toggle__text { display: none; }
  .nav-toggle { padding: 8px 12px; }

  .version-band__state { margin-left: 0; width: 100%; }

  .footer-nav { grid-template-columns: 1fr; gap: 22px; }

  .slip { padding: 18px; box-shadow: 3px 3px 0 rgba(14, 59, 46, .09); }

  .drawer__head { font-size: 16px; padding: 13px 14px; }
  .drawer__body { padding: 4px 14px 18px; font-size: 15.5px; }

  .plaque__note { margin-left: 0; width: 100%; }

  .footer-base__spacer { display: none; }
  .footer-base__inner { gap: 6px 16px; }

  .site-footer { margin-top: 54px; }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0ms !important;
  }

  .scroll-progress { display: none; }
}