/* ===========================================================
   天辰主站 · 共享样式 /assets/site.css
   深空底 + 舱体蓝 + 星轨银 + 琥珀金 · 堆叠面板 / 居中刊头 / 编号章节
   =========================================================== */

/* ---------- 1. 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, figure, blockquote, dl, dd, address, figure {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

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

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

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

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

main { display: block; }

:focus-visible {
  outline: 2px solid var(--amber-soft, #F4D49A);
  outline-offset: 3px;
  border-radius: 0;
}

/* ---------- 2. 变量 ---------- */
:root {
  --void: #061420;
  --hull: #0B2337;
  --deck: #12354F;
  --silver: #C8D4DF;
  --steel: #8A9CAD;
  --grid: #1F4A6B;
  --amber: #E2A34A;
  --amber-soft: #F4D49A;
  --paper: #EDF1F4;
  --ink: #08182A;

  --font-display: "Archivo Narrow", "Oswald", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "Noto Sans Mono CJK SC", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --step-1: 12px;
  --step-2: 14px;
  --step-3: 16px;
  --step-4: 20px;
  --step-5: 28px;
  --step-6: 44px;

  --unit: 8px;
  --gutter: clamp(20px, 4vw, 32px);
  --shell: 1280px;
  --ease: cubic-bezier(0.2, 0.6, 0.2, 1);
}

/* ---------- 3. 基础层 ---------- */
body {
  background-color: var(--void);
  color: var(--silver);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  min-height: 100vh;
  overflow-x: hidden;
}

@media (min-width: 1024px) {
  body { font-size: 17px; }
}

/* 全站精密网格底纹 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(31, 74, 107, 0.30) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(31, 74, 107, 0.16) 1px, transparent 1px);
  background-size: 96px 96px;
}

#main-content { display: block; scroll-margin-top: 150px; }

/* ---------- 4. 排版工具 ---------- */
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.display {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.2rem, 6vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.18em;
  color: var(--steel);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--amber);
  flex: none;
}

.index-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
  color: var(--amber);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid var(--grid);
  border-radius: 0;
  background: var(--hull);
  color: var(--silver);
  font-size: 14px;
  line-height: 1.2;
  letter-spacing: 0.08em;
  transition: background-color 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.btn:hover { border-color: var(--amber); color: var(--amber-soft); background: var(--deck); }

.btn--ghost { background: transparent; border-color: var(--grid); color: var(--silver); }
.btn--ghost:hover { background: var(--deck); color: var(--amber-soft); border-color: var(--amber); }

.btn--amber { border-color: var(--amber); color: var(--amber-soft); background: transparent; }
.btn--amber:hover { background: var(--amber); color: var(--ink); border-color: var(--amber); }

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

/* ---------- 6. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  transform: translateY(-180%);
  padding: 10px 16px;
  background: var(--amber);
  color: var(--ink);
  border: 1px solid var(--amber-soft);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  transition: transform 0.25s var(--ease);
}

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

/* ---------- 7. 刊头 ---------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(6, 20, 32, 0.94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--grid);
}

.masthead__ruler {
  display: block;
  height: 5px;
  background-image: repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 28px);
  opacity: 0.85;
}

.masthead__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px var(--gutter);
  transition: padding 0.3s var(--ease);
}

.masthead__edition {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--steel);
  white-space: nowrap;
}

.masthead__brand {
  display: grid;
  justify-items: center;
  gap: 4px;
  text-align: center;
}

.masthead__mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1.1;
  letter-spacing: 0.22em;
  text-indent: 0.22em;
  color: var(--paper);
  transition: font-size 0.3s var(--ease);
}

.masthead__line {
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--steel);
  white-space: nowrap;
}

.masthead__action {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
}

.readout {
  display: none;
  padding: 5px 9px;
  border: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.masthead[data-condensed] .readout { display: inline-block; }

.masthead[data-condensed] .masthead__inner { padding: 9px var(--gutter); }
.masthead[data-condensed] .masthead__edition,
.masthead[data-condensed] .masthead__line { display: none; }
.masthead[data-condensed] .masthead__mark { font-size: clamp(16px, 1.8vw, 20px); }
.masthead[data-condensed] .nav__link { padding: 9px 20px; }

/* 导航开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--grid);
  color: var(--silver);
}

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

.nav-toggle__bars { position: relative; width: 16px; height: 9px; flex: none; }

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  transition: transform 0.3s var(--ease), top 0.3s var(--ease), bottom 0.3s var(--ease);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { bottom: 4px; transform: rotate(-45deg); }

.nav-toggle__text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
}

/* 导航 */
.nav {
  border-top: 1px solid var(--grid);
  background: linear-gradient(180deg, rgba(18, 53, 79, 0.45), rgba(6, 20, 32, 0) 150%);
}

.nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.nav__item { border-left: 1px solid var(--grid); }
.nav__item:first-child { border-left: 0; }

.nav__link {
  display: block;
  padding: 14px 24px;
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--steel);
  transition: color 0.25s var(--ease), background-color 0.25s var(--ease), box-shadow 0.25s var(--ease),
    padding 0.25s var(--ease);
}

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

.nav__link[aria-current="page"] {
  color: var(--amber-soft);
  background: var(--deck);
  box-shadow: inset 0 -2px 0 0 var(--amber);
}

/* 阅读进度 */
.progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(31, 74, 107, 0.55);
  pointer-events: none;
}

.progress__bar { display: block; height: 100%; width: 0; background: var(--amber); }

/* ---------- 8. 页脚 ---------- */
.colophon {
  position: relative;
  border-top: 1px solid var(--grid);
  background: var(--void);
  color: var(--silver);
}

.colophon__ruler {
  display: block;
  height: 8px;
  border-bottom: 1px solid var(--grid);
  background-image: repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 56px);
}

.colophon__inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(36px, 6vw, 68px) var(--gutter) 0;
}

.colophon__grid { display: grid; gap: 34px; }

.colophon__cell { min-width: 0; }

.colophon__cell--lead { grid-column: auto; }

.colophon__mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.2em;
  color: var(--paper);
}

.colophon__line {
  margin-top: 6px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--steel);
}

.colophon__note {
  margin-top: 14px;
  max-width: 30em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

.colophon__stamp {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.colophon__title {
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.colophon__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  font-size: 15px;
  color: var(--silver);
  transition: color 0.25s var(--ease);
}

.colophon__link::before {
  content: "";
  flex: none;
  width: 10px;
  height: 1px;
  background: var(--grid);
  transition: width 0.25s var(--ease), background-color 0.25s var(--ease);
}

.colophon__link:hover { color: var(--amber-soft); }
.colophon__link:hover::before { width: 20px; background: var(--amber); }

.colophon__contact li {
  display: grid;
  gap: 2px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(31, 74, 107, 0.6);
}

.colophon__contact li:first-child { padding-top: 0; }
.colophon__contact li:last-child { border-bottom: 0; }

.colophon__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.colophon__value {
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
  word-break: break-word;
}

.colophon__meta {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--steel);
}

.colophon__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  margin-top: clamp(30px, 5vw, 52px);
  padding: 18px 0 30px;
  border-top: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.colophon__copy { letter-spacing: 0.08em; }

.colophon__legal-links { display: flex; flex-wrap: wrap; gap: 18px; }

.colophon__legal-links a {
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.colophon__legal-links a:hover { color: var(--amber-soft); border-bottom-color: var(--amber); }

/* ---------- 9. 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.container--narrow { max-width: 900px; }

.section {
  padding: clamp(48px, 8vw, 104px) 0;
  border-top: 1px solid var(--grid);
}

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

.rule--amber { background: linear-gradient(90deg, var(--amber), rgba(226, 163, 74, 0)); }

.grid { display: grid; gap: 24px; }

.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }
.grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

@media (min-width: 720px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1080px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ---------- 10. 面板 ---------- */
.panel {
  position: relative;
  padding: clamp(24px, 3.4vw, 48px);
  border: 1px solid var(--grid);
  background: var(--hull);
}

.panel--deck { background: var(--deck); }
.panel--void { background: var(--void); }

.panel--paper {
  background: var(--paper);
  border-color: #C6D2DC;
  color: var(--ink);
}

.panel__tag {
  position: absolute;
  top: -1px;
  left: -1px;
  padding: 4px 10px;
  background: var(--amber);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: 0.16em;
}

/* ---------- 11. 章节头 ---------- */
.chapter {
  display: grid;
  gap: var(--unit);
  padding-top: 32px;
  border-top: 1px solid var(--grid);
}

.chapter__index {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--amber);
}

.chapter__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.chapter__lede {
  max-width: 34em;
  font-size: 15px;
  color: var(--steel);
}

/* ---------- 12. 正文 ---------- */
.prose {
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver);
}

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

.prose h2 {
  margin-top: 2.2em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  line-height: 1.3;
  letter-spacing: 0;
  color: var(--paper);
}

.prose h3 {
  margin-top: 1.8em;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--paper);
}

.prose li {
  position: relative;
  margin-top: 0.5em;
  padding-left: 1.6em;
}

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 12px;
  height: 1px;
  background: var(--amber);
}

.prose a {
  color: var(--amber-soft);
  border-bottom: 1px solid var(--grid);
}

.prose a:hover { border-bottom-color: var(--amber-soft); }

.panel--paper .prose,
.panel--paper .prose h2,
.panel--paper .prose h3 { color: var(--ink); }

/* ---------- 13. 面包屑 ---------- */
.breadcrumb {
  padding: 20px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }

.breadcrumb li { display: flex; align-items: center; gap: 10px; }

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

.breadcrumb a { transition: color 0.25s var(--ease); }
.breadcrumb a:hover { color: var(--amber-soft); }

/* ---------- 14. 索引表 ---------- */
.table-scroll {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--grid);
}

.index-table { width: 100%; min-width: 560px; font-size: 14px; }

.index-table caption {
  padding: 0 0 10px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.index-table th {
  padding: 11px 14px;
  border-bottom: 1px solid var(--grid);
  background: var(--deck);
  color: var(--steel);
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-align: left;
  white-space: nowrap;
}

.index-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--grid);
  vertical-align: top;
  color: var(--silver);
}

.index-table tr:last-child td { border-bottom: 0; }

.index-table td.is-key,
.index-table .index-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.index-table--striped tbody tr:nth-child(even) { background: rgba(18, 53, 79, 0.35); }

/* ---------- 15. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--grid);
  background: rgba(18, 53, 79, 0.5);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.tag--amber { border-color: var(--amber); color: var(--amber-soft); }

/* ---------- 16. 图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  border: 1px solid var(--grid);
  background: var(--hull);
  overflow: hidden;
}

.media-frame__inner { position: relative; width: 100%; }

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

.media-frame--16x9 .media-frame__inner { aspect-ratio: 16 / 9; }
.media-frame--4x3 .media-frame__inner { aspect-ratio: 4 / 3; }
.media-frame--1x1 .media-frame__inner { aspect-ratio: 1 / 1; }
.media-frame--21x9 .media-frame__inner { aspect-ratio: 21 / 9; }

@media (max-width: 640px) {
  .media-frame--21x9 .media-frame__inner { aspect-ratio: 16 / 9; }
}

.media-frame__caption {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 16px;
  padding: 10px 14px;
  border-top: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.media-frame__corner {
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1px solid var(--amber);
  pointer-events: none;
}

.media-frame__corner--tl { top: 8px; left: 8px; border-right: 0; border-bottom: 0; }
.media-frame__corner--br { right: 8px; bottom: 8px; border-left: 0; border-top: 0; }

/* ---------- 17. 图形底纹 ---------- */
.diagram {
  position: relative;
  min-height: 180px;
  border: 1px solid var(--grid);
  background: linear-gradient(135deg, rgba(18, 53, 79, 0.55), rgba(6, 20, 32, 0.92));
  overflow: hidden;
}

.diagram__ticks {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, rgba(31, 74, 107, 0.55) 0 1px, transparent 1px 56px);
}

/* ---------- 18. 进入视口 ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
}

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

/* ---------- 19. 平板与移动 ---------- */
@media (min-width: 861px) and (max-width: 1079px) {
  .nav__link { padding: 13px 16px; font-size: 13px; letter-spacing: 0.1em; }
  .masthead__edition { font-size: 11px; }
}

@media (min-width: 720px) {
  .colophon__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 38px 48px;
  }
  .colophon__cell--lead { grid-column: 1 / -1; }
}

@media (min-width: 1080px) {
  .colophon__grid {
    grid-template-columns: minmax(0, 1.7fr) repeat(3, minmax(0, 0.8fr)) minmax(0, 1.2fr);
    gap: 0;
  }
  .colophon__cell { padding: 0 26px; border-left: 1px solid var(--grid); }
  .colophon__cell:first-child { padding-left: 0; border-left: 0; }
  .colophon__cell--lead { grid-column: auto; }
}

@media (max-width: 860px) {
  .masthead__inner {
    grid-template-columns: 1fr auto;
    gap: 12px;
    padding: 12px var(--gutter);
  }

  .masthead__edition { display: none; }

  .masthead__brand { justify-items: start; text-align: left; }

  .masthead__mark {
    font-size: 19px;
    letter-spacing: 0.18em;
    text-indent: 0.18em;
  }

  .masthead__line {
    font-size: 10px;
    letter-spacing: 0.16em;
    white-space: normal;
  }

  .masthead__action { gap: 10px; }

  .masthead__action .btn { display: none; }

  .readout { display: none !important; }

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

  .nav {
    max-height: 0;
    overflow: hidden;
    border-top: 0;
    transition: max-height 0.34s var(--ease);
  }

  .nav[data-open] {
    max-height: min(76vh, 560px);
    overflow-y: auto;
    border-top: 1px solid var(--grid);
  }

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

  .nav__item { border-left: 0; border-top: 1px solid var(--grid); }
  .nav__item:first-child { border-top: 0; }

  .nav__link { padding: 15px 4px; font-size: 15px; letter-spacing: 0.1em; }

  .nav__link[aria-current="page"] {
    box-shadow: inset 3px 0 0 0 var(--amber);
    padding-left: 14px;
  }

  .masthead[data-condensed] .nav__link { padding: 15px 4px; }
}

@media (max-width: 640px) {
  .colophon__legal { flex-direction: column; align-items: flex-start; }
}

/* ---------- 20. 降低动效 ---------- */
@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;
  }

  .has-js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

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