/* ============================================================
   闲逸麻将馆 · 共享样式表 /assets/site.css
   技术蓝图式网格 · 珠宝色分区 · 居中刊头报头结构
   ============================================================ */

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

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

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

ul, ol { padding: 0; }

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

button, input, select, textarea { font: inherit; color: inherit; }

a { color: inherit; }

table { border-collapse: collapse; }

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 色彩 */
  --celadon: #3F6B5E;
  --celadon-deep: #2E5248;
  --indigo: #1E3A44;
  --indigo-deep: #162C34;
  --wine: #6E2A2A;
  --paper: #F7F3EA;
  --paper-2: #EFE8DA;
  --wood: #A9793F;
  --cinnabar: #B23A2E;
  --cinnabar-deep: #9A2F25;
  --gold: #C9A961;
  --ink: #23282B;
  --mist: #7C8C88;

  /* 字体 */
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", "Times New Roman", serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* 尺度 */
  --shell-max: 1280px;
  --gutter: 88px;
  --rail: 88px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);

  /* 线条 */
  --line-gold: 1px solid var(--gold);
  --line-wood: 1px solid var(--wood);
  --line-soft: 1px solid rgba(169, 121, 63, 0.35);
}

/* ---------- 3. 中文排版与页面底色 ---------- */
body {
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.3;
  color: var(--ink);
}

h1 { font-size: 34px; letter-spacing: 0.02em; }
h2 { font-size: 28px; }
h3 { font-size: 20px; }
h4 { font-size: 17px; }

p { font-size: 16px; line-height: 1.85; }

strong { font-weight: 600; color: var(--ink); }

::selection { background: rgba(178, 58, 46, 0.16); }

/* ---------- 4. 焦点与可访问性 ---------- */
:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 2px;
}

.masthead :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--gold);
}

.skip-link {
  position: absolute;
  left: 16px;
  top: 0;
  z-index: 200;
  transform: translateY(-140%);
  background: var(--cinnabar);
  color: var(--paper);
  font-size: 14px;
  letter-spacing: 0.08em;
  padding: 12px 20px;
  text-decoration: none;
  transition: transform 160ms var(--ease);
}

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

#main-content { scroll-margin-top: 140px; }

/* ---------- 5. 容器与网格 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}

.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }

.prose {
  max-width: 42em;
  font-size: 16px;
  line-height: 1.85;
}

.prose p + p { margin-top: 1.1em; }
.prose h2 { margin-top: 2.4em; margin-bottom: 0.7em; }
.prose h3 { margin-top: 1.9em; margin-bottom: 0.6em; }
.prose ul, .prose ol { margin: 1em 0 1em 1.2em; }
.prose li { margin-bottom: 0.4em; }

/* 左缘刻度栏（页面阶段配合网格使用） */
.rail {
  position: sticky;
  top: 132px;
  align-self: start;
  border-top: var(--line-gold);
  padding-top: 12px;
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--wood);
}

/* ---------- 6. 居中刊头（Header） ---------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--celadon);
  color: var(--paper);
  transition: background-color 240ms var(--ease);
}

.masthead::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 5px;
  background-image: repeating-linear-gradient(90deg, var(--gold) 0 1px, transparent 1px 24px);
  opacity: 0.4;
  pointer-events: none;
}

.masthead__progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: rgba(201, 169, 97, 0.22);
}

.masthead__progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  background-color: var(--cinnabar);
  transform: scaleX(0);
  transform-origin: left center;
}

.masthead__shell {
  position: relative;
  padding-block: 22px 14px;
  transition: padding-block 240ms var(--ease);
}

.masthead__brandrow {
  display: flex;
  justify-content: center;
}

.masthead__brand {
  display: inline-block;
  padding: 4px 0 8px;
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-indent: 0.32em;
  color: var(--paper);
  text-decoration: none;
  border-bottom: var(--line-gold);
  transition: font-size 240ms var(--ease), border-color 240ms var(--ease);
}

.masthead__brand:hover { color: #FFFFFF; }

.masthead__statement {
  margin-top: 12px;
  text-align: center;
  font-size: 14px;
  line-height: 1.6;
  letter-spacing: 0.14em;
  color: rgba(247, 243, 234, 0.74);
}

.masthead__navrow {
  display: flex;
  justify-content: center;
  margin-top: 6px;
}

.masthead__actions {
  position: absolute;
  top: 24px;
  right: var(--gutter);
  display: flex;
  gap: 10px;
  z-index: 2;
}

.masthead__actions .btn { min-height: 40px; padding: 0 16px; font-size: 13px; }

/* 吸顶收缩态 */
.masthead.is-condensed .masthead__shell { padding-block: 8px 10px; }

.masthead.is-condensed .masthead__brand {
  font-size: 19px;
  letter-spacing: 0.24em;
  text-indent: 0.24em;
  padding: 2px 0 4px;
  border-bottom-color: transparent;
}

.masthead.is-condensed .masthead__statement { display: none; }

.masthead.is-condensed .masthead__navrow { margin-top: 0; }

.masthead.is-condensed .masthead__actions { top: 12px; }

.masthead.is-condensed .masthead__actions .btn { min-height: 34px; font-size: 13px; }

/* ---------- 7. 全站栏目导航 ---------- */
.site-nav {
  display: block;
}

.site-nav__brand,
.site-nav__close,
.site-nav__cta { display: none; }

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__item { position: relative; }

.site-nav__item + .site-nav__item { border-left: 1px solid rgba(201, 169, 97, 0.45); }

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: rgba(247, 243, 234, 0.84);
  text-decoration: none;
  transition: color 160ms var(--ease), background-color 160ms var(--ease);
}

.site-nav__link:hover { color: #FFFFFF; }

.site-nav__link[aria-current="page"] { color: #FFFFFF; }

.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 6px;
  width: 5px;
  height: 5px;
  margin-left: -2.5px;
  background-color: var(--cinnabar);
  transform: rotate(45deg);
}

/* 移动端抽屉按钮 */
.nav-toggle {
  display: none;
  position: absolute;
  top: 14px;
  right: var(--gutter);
  align-items: center;
  gap: 10px;
  min-width: 44px;
  min-height: 44px;
  padding: 0 14px;
  background-color: transparent;
  border: 1px solid rgba(201, 169, 97, 0.55);
  color: var(--paper);
  font-size: 13px;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: border-color 160ms var(--ease), background-color 160ms var(--ease);
}

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

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 1px;
  background-color: currentColor;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1px;
  background-color: currentColor;
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

/* 遮罩 */
.nav-scrim {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 70;
  background-color: rgba(30, 58, 68, 0.55);
  opacity: 0;
  pointer-events: none;
  transition: opacity 240ms var(--ease);
}

.nav-scrim[data-open] {
  opacity: 1;
  pointer-events: auto;
}

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-align: center;
  border: 1px solid transparent;
  border-radius: 0;
  cursor: pointer;
  transition: background-color 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}

.btn--primary {
  background-color: var(--cinnabar);
  color: var(--paper);
}

.btn--primary:hover { background-color: var(--cinnabar-deep); }

.btn--ghost {
  background-color: transparent;
  color: var(--paper);
  border-color: rgba(247, 243, 234, 0.45);
}

.btn--ghost:hover {
  color: #FFFFFF;
  border-color: var(--gold);
}

.btn--line {
  background-color: transparent;
  color: var(--celadon);
  border-color: var(--wood);
}

.btn--line:hover {
  background-color: var(--paper-2);
  border-color: var(--cinnabar);
}

.btn--block { width: 100%; }

/* ---------- 9. 面包屑 ---------- */
.breadcrumb {
  padding-block: 24px 0;
  font-size: 14px;
  color: var(--mist);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--gold);
}

.breadcrumb__list a {
  color: var(--mist);
  text-decoration: none;
  transition: color 160ms var(--ease);
}

.breadcrumb__list a:hover { color: var(--celadon); }

/* ---------- 10. 章节题头 ---------- */
.section-head {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  margin-bottom: 40px;
}

.section-head__no {
  padding-top: 6px;
  border-top: var(--line-gold);
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--wood);
}

.section-head__title { font-size: 28px; }

.section-head__lede {
  margin-top: 12px;
  max-width: 56ch;
  font-size: 16px;
  color: var(--mist);
}

/* ---------- 11. 卡片 / 术语 / 证据边界 ---------- */
.card {
  background-color: var(--paper-2);
  border: var(--line-wood);
  padding: 28px;
  transition: transform 160ms var(--ease), border-color 160ms var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--cinnabar);
}

.card__label {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--wood);
}

.card__title { font-size: 20px; }

.card__text {
  margin-top: 10px;
  font-size: 15px;
  color: var(--ink);
}

.term-card {
  background-color: var(--paper);
  border-left: 3px solid var(--celadon);
  padding: 16px 20px;
}

.term-card__term {
  display: block;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--celadon);
}

.term-card__desc {
  margin-top: 6px;
  font-size: 14px;
  color: var(--mist);
}

.note-block {
  background-color: var(--paper-2);
  border-left: 3px solid var(--wood);
  padding: 20px 24px;
}

.note-block__label {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--wood);
}

.note-block--alert { border-left-color: var(--cinnabar); }
.note-block--alert .note-block__label { color: var(--cinnabar); }

/* ---------- 12. 数据表 ---------- */
.data-table {
  width: 100%;
  font-size: 15px;
  font-variant-numeric: tabular-nums;
}

.data-table caption {
  margin-bottom: 12px;
  text-align: left;
  font-size: 14px;
  color: var(--mist);
}

.data-table th {
  background-color: var(--celadon);
  color: var(--paper);
  font-weight: 400;
  font-size: 14px;
  letter-spacing: 0.1em;
  text-align: left;
  padding: 12px 16px;
  border: 1px solid rgba(201, 169, 97, 0.45);
}

.data-table td {
  padding: 12px 16px;
  border: var(--line-soft);
}

.data-table tbody tr:nth-child(even) { background-color: var(--paper-2); }
.data-table tbody tr:hover { background-color: rgba(201, 169, 97, 0.16); }

/* ---------- 13. 分段标签（可访问标签页） ---------- */
.tabs__list {
  display: flex;
  flex-wrap: wrap;
  border-bottom: var(--line-wood);
}

.tabs__tab {
  appearance: none;
  min-height: 44px;
  padding: 14px 22px;
  background-color: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  font-family: var(--font-sans);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--mist);
  cursor: pointer;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background-color 160ms var(--ease);
}

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

.tabs__tab[aria-selected="true"] {
  color: var(--celadon);
  border-bottom-color: var(--cinnabar);
  background-color: var(--paper-2);
}

.tabs__panel { padding-top: 28px; }
.tabs__panel[hidden] { display: none; }

.tabs__panel:not([hidden]) {
  animation: lx-fade-in 200ms var(--ease) both;
}

@keyframes lx-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 14. 时间线 ---------- */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  border-left: var(--line-gold);
}

.timeline__item {
  position: relative;
  padding-bottom: 36px;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 9px;
  width: 9px;
  height: 9px;
  background-color: var(--paper);
  border: 1px solid var(--wood);
  transform: rotate(45deg);
}

.timeline__year {
  display: block;
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--wood);
}

.timeline__title { margin-top: 4px; font-size: 20px; }

.timeline__text {
  margin-top: 8px;
  max-width: 56ch;
  font-size: 15px;
  color: var(--ink);
}

/* ---------- 15. 折叠条目 ---------- */
.fold {
  border-bottom: var(--line-soft);
}

.fold__title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 44px;
  padding: 16px 0;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.fold__title::-webkit-details-marker { display: none; }

.fold__title::after {
  content: "+";
  font-family: var(--font-sans);
  font-size: 18px;
  color: var(--wood);
  transition: color 160ms var(--ease);
}

.fold[open] .fold__title::after { content: "–"; color: var(--cinnabar); }

.fold__body {
  padding: 0 0 20px;
  max-width: 62ch;
  font-size: 15px;
  color: var(--ink);
}

/* ---------- 16. 图片容器基础规则 ---------- */
.figure { margin: 0; }

.figure__frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background-color: var(--paper-2);
  border: var(--line-wood);
}

.figure__frame::after {
  content: "";
  display: block;
  padding-top: var(--figure-ratio, 66.6%);
}

.figure__media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(0.98);
}

.figure__caption {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.figure--left { margin-left: calc(var(--rail) * -1); }

/* ---------- 17. 页脚 ---------- */
.site-footer {
  margin-top: 96px;
  padding-block: 72px 0;
  background-color: var(--indigo);
  color: rgba(247, 243, 234, 0.82);
  border-top: 3px solid var(--celadon);
  font-size: 15px;
}

.site-footer__top {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(0, 2fr);
  gap: 48px 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(201, 169, 97, 0.28);
}

.site-footer__name {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--paper);
}

.site-footer__closing {
  margin-top: 14px;
  font-family: var(--font-serif);
  font-size: 16px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.site-footer__since {
  margin-top: 12px;
  max-width: 30ch;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 243, 234, 0.6);
}

.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 40px;
}

.site-footer__coltitle {
  margin-bottom: 16px;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.site-footer__list {
  display: grid;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__link {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 15px;
  color: rgba(247, 243, 234, 0.82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.site-footer__link:hover {
  color: #FFFFFF;
  border-bottom-color: var(--gold);
}

.site-footer__contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px 40px;
  padding-block: 36px;
  border-bottom: 1px solid rgba(201, 169, 97, 0.28);
}

.site-footer__contact-item { font-size: 15px; line-height: 1.7; }

.site-footer__contact-label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.site-footer__contact-value {
  color: var(--paper);
  word-break: break-word;
}

.site-footer__note {
  grid-column: 1 / -1;
  font-size: 14px;
  color: rgba(247, 243, 234, 0.6);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 32px;
  align-items: center;
  padding-block: 24px 40px;
  font-size: 14px;
  color: rgba(247, 243, 234, 0.58);
}

/* ---------- 18. 显现动效协议 ---------- */
.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 240ms var(--ease), transform 240ms var(--ease);
}

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

/* ---------- 19. 响应式 ---------- */
@media (max-width: 1180px) {
  .masthead__actions { display: none; }
}

@media (max-width: 1024px) {
  :root { --gutter: 48px; }
  .figure--left { margin-left: 0; }
}

@media (max-width: 900px) {
  h1 { font-size: 28px; }
  h2 { font-size: 24px; }

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

  .masthead__statement { display: none; }

  .masthead__shell { padding-block: 14px 12px; }

  .masthead__brand {
    font-size: 21px;
    letter-spacing: 0.24em;
    text-indent: 0.24em;
    border-bottom-color: transparent;
  }

  .masthead__navrow { display: block; margin-top: 0; }

  .nav-scrim { display: block; }

  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 80;
    width: min(320px, 84vw);
    padding: 24px 0 32px;
    background-color: var(--indigo);
    border-right: 1px solid rgba(201, 169, 97, 0.35);
    overflow-y: auto;
    transform: translateX(-102%);
    transition: transform 240ms var(--ease);
  }

  .site-nav[data-open] { transform: none; }

  .site-nav__brand {
    display: block;
    padding: 0 24px 16px;
    font-family: var(--font-serif);
    font-size: 17px;
    letter-spacing: 0.2em;
    color: var(--gold);
    border-bottom: 1px solid rgba(201, 169, 97, 0.35);
  }

  .site-nav__close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: 14px;
    right: 14px;
    min-width: 44px;
    min-height: 44px;
    padding: 0 12px;
    background-color: transparent;
    border: 1px solid rgba(201, 169, 97, 0.45);
    color: var(--paper);
    font-size: 13px;
    letter-spacing: 0.16em;
    cursor: pointer;
  }

  .site-nav__list {
    display: block;
    padding-top: 8px;
  }

  .site-nav__item + .site-nav__item {
    border-left: 0;
    border-top: 1px solid rgba(201, 169, 97, 0.22);
  }

  .site-nav__link {
    justify-content: flex-start;
    width: 100%;
    padding: 0 24px;
    font-size: 16px;
    color: rgba(247, 243, 234, 0.88);
  }

  .site-nav__link[aria-current="page"] {
    background-color: rgba(63, 107, 94, 0.45);
    color: #FFFFFF;
  }

  .site-nav__link[aria-current="page"]::after {
    left: 10px;
    top: 50%;
    bottom: auto;
    margin-left: 0;
    transform: translateY(-50%) rotate(45deg);
  }

  .site-nav__cta {
    display: grid;
    gap: 10px;
    padding: 24px;
  }

  body.is-nav-open { overflow: hidden; }

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

  .section-head { grid-template-columns: minmax(0, 1fr); gap: 12px; }

  .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); gap: 24px; }

  .site-footer { padding-top: 56px; }

  .site-footer__top {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
    padding-bottom: 36px;
  }

  .site-footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 24px; }
}

@media (max-width: 640px) {
  :root { --gutter: 20px; }

  .masthead__brand { font-size: 19px; }

  .nav-toggle { top: 10px; }

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

  .rail { position: static; }

  .tabs__tab { padding: 12px 16px; }
}

/* ---------- 20. 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;
  }

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