/* =========================================================
   欢乐龙城服务 · happy-dragon-city.com.cn
   site.css —— 全站共享样式（reset / 变量 / 中文排版 / 页头 / 页脚 / 通用组件）
   ========================================================= */

:root {
  /* 色彩体系 */
  --paper: #F4ECDD;
  --paper-raised: #FBF6EB;
  --ink: #211914;
  --ink-soft: #3A2E26;
  --grey-ink: #5A4C42;
  --line: #E2D7C3;
  --line-strong: #CDBEA3;

  --crimson: #8C1C1C;
  --vermilion: #B33A2B;
  --gold: #C9A227;
  --gold-deep: #9A7A12;

  --jade: #2E6E63;
  --amber-orange: #D9722B;
  --amber-gold: #E0B84C;

  /* 字体 */
  --font-display: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif CJK SC", "SimSun", serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", sans-serif;

  /* 尺度 */
  --max-w: 1180px;
  --nav-break: 900px;
  --radius: 6px;
  --ease: cubic-bezier(.22, .61, .36, 1);

  --shadow-soft: 0 1px 0 rgba(33, 25, 20, .04), 0 14px 32px -24px rgba(33, 25, 20, .55);
  --shadow-lift: 0 2px 0 rgba(33, 25, 20, .05), 0 24px 44px -26px rgba(33, 25, 20, .48);
}

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

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

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--paper);
  background-image:
    radial-gradient(58rem 30rem at 6% -8%, rgba(201, 162, 39, .11), transparent 62%),
    radial-gradient(50rem 28rem at 104% 3%, rgba(140, 28, 28, .08), transparent 60%);
  background-repeat: no-repeat;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

button { font: inherit; color: inherit; }

a { color: inherit; }

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

[hidden] { display: none !important; }

#main-content { scroll-margin-top: 96px; }

/* ---------- 2. 中文排版 ---------- */
h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: .015em;
  color: var(--ink);
}

h1 { font-size: clamp(30px, 4.6vw, 46px); }
h2 { font-size: clamp(24px, 3.2vw, 34px); }
h3 { font-size: clamp(19px, 2.1vw, 23px); }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

strong, b { font-weight: 700; }

/* ---------- 3. 无障碍基础 ---------- */
:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  left: 50%;
  top: 0;
  z-index: 120;
  transform: translate(-50%, -140%);
  padding: 10px 20px;
  background: var(--crimson);
  color: #F8F1E2;
  font-size: 14px;
  letter-spacing: .08em;
  text-decoration: none;
  border-radius: 0 0 8px 8px;
  transition: transform .22s var(--ease);
}
.skip-link:focus { transform: translate(-50%, 0); }

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 4. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border: 1px solid var(--gold);
  border-radius: 999px;
  background: transparent;
  color: var(--crimson);
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: .08em;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color .22s var(--ease), color .22s var(--ease),
              border-color .22s var(--ease), transform .22s var(--ease);
}

.btn:hover {
  background: var(--crimson);
  border-color: var(--crimson);
  color: #F8F1E2;
  transform: translateY(-1px);
}

.btn--primary {
  background: var(--crimson);
  border-color: var(--crimson);
  color: #F8F1E2;
}
.btn--primary:hover {
  background: var(--vermilion);
  border-color: var(--vermilion);
}

.btn--ghost { background: transparent; }

.btn--sm {
  padding: 8px 16px;
  font-size: 13px;
  letter-spacing: .06em;
}

/* ---------- 5. 页头：居中刊头导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 10px 26px -26px rgba(33, 25, 20, .7);
}

.version-bar {
  margin: 0;
  padding: 7px 18px;
  max-height: 60px;
  overflow: hidden;
  background: var(--crimson);
  border-bottom: 1px solid rgba(201, 162, 39, .45);
  color: #F7EFE0;
  font-size: 12.5px;
  letter-spacing: .06em;
  line-height: 1.6;
  text-align: center;
  transition: max-height .3s var(--ease), padding .3s var(--ease),
              opacity .2s linear, border-color .3s var(--ease);
}

.site-header.is-compact .version-bar {
  max-height: 0;
  padding-top: 0;
  padding-bottom: 0;
  opacity: 0;
  border-color: transparent;
}

.site-header__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-inline: clamp(18px, 4vw, 32px);
}

.site-header__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 20px 0 12px;
  transition: padding .3s var(--ease);
}

.site-header.is-compact .site-header__top { padding: 8px 0 6px; }

.header-spacer { display: block; }

/* 刊头 */
.masthead {
  grid-column: 2;
  display: flex;
  justify-content: center;
}

.masthead__brand {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-decoration: none;
  color: var(--ink);
}

.masthead__name {
  font-family: var(--font-display);
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.05;
  color: var(--ink);
  transition: font-size .3s var(--ease), color .22s var(--ease);
}

.masthead__name::after {
  content: "";
  display: block;
  width: 54px;
  height: 2px;
  margin: 9px auto 0;
  background: linear-gradient(90deg, transparent, var(--gold) 22%, var(--gold) 78%, transparent);
  transition: width .3s var(--ease);
}

.masthead__brand:hover .masthead__name { color: var(--crimson); }
.masthead__brand:hover .masthead__name::after { width: 88px; }

.masthead__sub {
  max-height: 26px;
  overflow: hidden;
  font-size: 12.5px;
  letter-spacing: .3em;
  color: var(--grey-ink);
  transition: max-height .3s var(--ease), opacity .2s linear, font-size .3s var(--ease);
}

.site-header.is-compact .masthead__name { font-size: clamp(21px, 2.3vw, 27px); }
.site-header.is-compact .masthead__name::after { margin-top: 5px; width: 40px; }
.site-header.is-compact .masthead__sub {
  max-height: 0;
  opacity: 0;
}

/* 刊头右侧工具区 */
.header-tools {
  grid-column: 3;
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 10px;
}

.version-tag {
  padding: 4px 11px;
  border: 1px solid var(--gold);
  border-radius: 999px;
  background: rgba(201, 162, 39, .12);
  color: var(--crimson);
  font-size: 12px;
  letter-spacing: .14em;
  line-height: 1.7;
  white-space: nowrap;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 15px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--paper-raised);
  color: var(--ink);
  font-size: 13px;
  letter-spacing: .12em;
  line-height: 1.4;
  cursor: pointer;
  transition: border-color .22s var(--ease), background-color .22s var(--ease);
}

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

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  background: currentColor;
  transition: transform .26s var(--ease), top .26s var(--ease);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { top: 8px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 4px; transform: rotate(-45deg); }
.nav-toggle[aria-expanded="true"] {
  background: var(--crimson);
  border-color: var(--crimson);
  color: #F8F1E2;
}

/* 栏目导航 */
.site-nav { padding-bottom: 10px; }

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(4px, 1.4vw, 24px);
  list-style: none;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 4px;
  color: var(--ink);
  font-size: 14.5px;
  letter-spacing: .08em;
  line-height: 1.4;
  text-decoration: none;
  transition: color .2s var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 4px;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform .26s var(--ease);
}

.site-nav__link:hover { color: var(--vermilion); }
.site-nav__link:hover::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] {
  color: var(--crimson);
  font-weight: 700;
}
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--crimson), var(--vermilion) 42%, var(--gold));
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  background: var(--ink);
  color: #EFE5D3;
}

.site-footer::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--crimson), var(--gold) 48%, var(--crimson));
}

.site-footer__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: clamp(34px, 5vw, 64px) clamp(18px, 4vw, 32px) clamp(24px, 3vw, 38px);
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(0, 2.1fr);
  gap: clamp(26px, 5vw, 72px);
}

.footer-brand__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(24px, 2.6vw, 30px);
  letter-spacing: .06em;
  color: #F6EEDC;
}

.footer-brand__sub {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: .28em;
  color: rgba(239, 229, 211, .58);
}

.footer-brand__meta {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid rgba(201, 162, 39, .55);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(239, 229, 211, .62);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 44px);
}

.footer-col__title {
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(201, 162, 39, .34);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--amber-gold);
}

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

.footer-col__list a {
  display: inline-block;
  font-size: 14.5px;
  color: rgba(239, 229, 211, .82);
  text-decoration: none;
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

.footer-col__list a:hover {
  color: var(--amber-gold);
  padding-left: 5px;
}

.footer-meta {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 24px clamp(18px, 4vw, 32px) 30px;
  border-top: 1px solid rgba(226, 215, 195, .16);
  display: grid;
  gap: 7px;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(239, 229, 211, .64);
}

.footer-meta__line { margin: 0; }

.footer-meta__line--legal {
  color: rgba(224, 184, 76, .82);
  letter-spacing: .04em;
}

.footer-base {
  border-top: 1px solid rgba(226, 215, 195, .12);
  background: rgba(0, 0, 0, .22);
}

.footer-base__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 15px clamp(18px, 4vw, 32px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 13px;
  color: rgba(239, 229, 211, .52);
}

.footer-base__copy,
.footer-base__domain { margin: 0; }

.footer-base__domain { letter-spacing: .06em; }

/* 返回卷首 */
.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 17px;
  border: 1px solid rgba(201, 162, 39, .6);
  border-radius: 999px;
  background: rgba(33, 25, 20, .94);
  color: var(--amber-gold);
  font-size: 13px;
  letter-spacing: .12em;
  line-height: 1.4;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .26s var(--ease), transform .26s var(--ease),
              visibility .26s linear, background-color .2s var(--ease),
              color .2s var(--ease), border-color .2s var(--ease);
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover {
  background: var(--crimson);
  border-color: var(--crimson);
  color: #F8F1E2;
}

.to-top__mark { font-size: 14px; }

/* ---------- 7. 布局容器与网格 ---------- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding-inline: clamp(18px, 4vw, 32px);
}

.container--narrow { max-width: 860px; }

.section { padding-block: clamp(38px, 6vw, 78px); }

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.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)); }
.grid--split { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }

/* ---------- 8. 章节标题组 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--crimson);
}

.chapter-no {
  display: inline-block;
  padding: 3px 10px;
  border: 1px solid rgba(140, 28, 28, .28);
  border-radius: 4px;
  background: rgba(140, 28, 28, .07);
  color: var(--crimson);
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: .18em;
  line-height: 1.6;
}

.section-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 36px);
}

.section-head__title { letter-spacing: .02em; }

.section-head__desc {
  margin: 0;
  max-width: 44em;
  font-size: 15.5px;
  color: var(--grey-ink);
}

/* ---------- 9. 正文排版 ---------- */
.prose {
  max-width: 42em;
  font-size: 16.5px;
}

.prose h2 { margin: 1.5em 0 .55em; }
.prose h3 { margin: 1.3em 0 .45em; }
.prose p { margin: 0 0 1.05em; }
.prose ul,
.prose ol { margin: 0 0 1.1em; padding-left: 1.2em; }
.prose li { margin-bottom: .4em; }

/* ---------- 10. 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-raised);
  box-shadow: var(--shadow-soft);
  transition: transform .28s var(--ease), box-shadow .28s var(--ease),
              border-color .28s var(--ease);
}

.card:hover {
  transform: translateY(-3px);
  border-color: rgba(201, 162, 39, .62);
  box-shadow: var(--shadow-lift);
}

.card--notch::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 22px 22px 0;
  border-color: transparent var(--crimson) transparent transparent;
  opacity: .9;
}

.card__title {
  margin: 0 0 8px;
  font-size: 19px;
  letter-spacing: .02em;
}

.card__text {
  margin: 0;
  font-size: 15px;
  color: var(--grey-ink);
}

/* ---------- 11. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid currentColor;
  border-radius: 999px;
  background: rgba(90, 76, 66, .06);
  color: var(--grey-ink);
  font-size: 12px;
  letter-spacing: .12em;
  line-height: 1.7;
  white-space: nowrap;
}

.tag--jade { color: var(--jade); background: rgba(46, 110, 99, .1); }
.tag--orange { color: var(--amber-orange); background: rgba(217, 114, 43, .11); }
.tag--gold { color: var(--gold-deep); background: rgba(224, 184, 76, .18); }
.tag--crimson { color: var(--crimson); background: rgba(140, 28, 28, .08); }

/* ---------- 12. 关键数据 ---------- */
.stat {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.stat__num {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.6vw, 44px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: .01em;
  color: var(--gold-deep);
}

.stat__label {
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--grey-ink);
}

/* ---------- 13. 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(148deg, #2B1E17 0%, #5A3123 58%, #8C1C1C 100%);
  aspect-ratio: 16 / 10;
}

.media > img,
.media > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.media--placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(244, 236, 221, .22) 1px, transparent 1px);
  background-size: 12px 12px;
  pointer-events: none;
}

/* ---------- 14. 折叠面板 ---------- */
.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-raised);
  overflow: hidden;
}

.panel + .panel { margin-top: 10px; }

.panel > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 18px;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.5;
  cursor: pointer;
  list-style: none;
  transition: background-color .2s var(--ease);
}

.panel > summary::-webkit-details-marker { display: none; }

.panel > summary::after {
  content: "＋";
  flex: none;
  color: var(--gold-deep);
  font-size: 15px;
}

.panel[open] > summary { background: rgba(201, 162, 39, .1); }
.panel[open] > summary::after { content: "－"; }

.panel__body {
  padding: 4px 18px 18px;
  font-size: 15px;
  color: var(--grey-ink);
}

.panel__body p:last-child { margin-bottom: 0; }

/* ---------- 15. 面包屑 ---------- */
.breadcrumb {
  padding-block: 16px;
  font-size: 13px;
  color: var(--grey-ink);
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb li + li::before {
  content: "／";
  color: var(--line-strong);
}

.breadcrumb a {
  color: var(--grey-ink);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.breadcrumb a:hover {
  color: var(--vermilion);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 16. 滚动显现 ---------- */
html.has-js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .42s var(--ease), transform .42s var(--ease);
}

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

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1080px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--split { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 900px) {
  .site-header__top {
    grid-template-columns: minmax(0, 1fr) auto;
    padding: 13px 0 10px;
  }

  .header-spacer { display: none; }

  .masthead {
    grid-column: 1;
    justify-content: flex-start;
  }

  .masthead__brand { align-items: flex-start; }
  .masthead__name::after { margin-inline: 0; }
  .masthead__name { font-size: clamp(26px, 7vw, 34px); }
  .site-header.is-compact .masthead__name { font-size: clamp(20px, 5.4vw, 24px); }

  .header-tools { grid-column: 2; }
  .header-cta { display: none; }

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

  .site-nav {
    max-height: 0;
    overflow: hidden;
    padding-bottom: 0;
    transition: max-height .36s var(--ease);
  }

  .site-nav[data-open] {
    max-height: 78vh;
    overflow-y: auto;
    padding-bottom: 14px;
  }

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

  .site-nav__link {
    display: block;
    padding: 13px 2px;
    border-bottom: 1px solid var(--line);
    font-size: 16px;
  }

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

  .site-nav__link[aria-current="page"] {
    color: var(--crimson);
    box-shadow: inset 3px 0 0 var(--gold);
    padding-left: 12px;
  }

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

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

@media (max-width: 600px) {
  body { font-size: 15.5px; }

  .version-bar { font-size: 11.5px; letter-spacing: .02em; }

  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }

  .footer-base__inner { justify-content: flex-start; }

  .to-top { padding: 9px 14px; font-size: 12px; }
}

@media (max-width: 420px) {
  .masthead__sub { letter-spacing: .2em; font-size: 11.5px; }
}

/* ---------- 18. 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;
  }

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