/* ==========================================================================
   PG 品牌 · 荷官班次值班台 — 全站共享样式 /assets/site.css
   设计母题：深夜值班室排班表。午夜蓝为底，米白为纸，筹码金作印章，
   三色时段色带贯穿页头、页脚与章节标记。
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 140px;
}

body {
  margin: 0;
  background: #0B1B33;
  color: #F5F1E9;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.85;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

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

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

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

table { border-collapse: collapse; border-spacing: 0; }

hr { border: 0; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 色彩 */
  --ink-900: #0B1B33;   /* 深夜蓝 —— 主背景 */
  --ink-800: #16283F;   /* 靛青暗层 —— 分隔块 */
  --ink-700: #1E3554;   /* 中间层 */
  --paper:   #F5F1E9;   /* 米白纸面 */
  --sand:    #E4DFD3;   /* 岩灰浅 —— 斑马纹 */
  --stone:   #5A6273;   /* 岩灰 —— 次级文字 */
  --gold:    #C9A227;   /* 筹码金 */
  --gold-deep: #8A6A10; /* 浅底上的金色替代（保证对比度） */
  --wine:    #6E1F2C;   /* 深酒红 */
  --am:      #9FC7C2;   /* 晨雾青 · 早班 */
  --noon:    #E0A44A;   /* 正午琥珀 · 午班 */
  --night:   #4C5E9E;   /* 夜巡靛 · 夜班 */

  /* 字体 */
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system,
               "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular,
               Menlo, Consolas, "Liberation Mono", monospace;

  /* 字号阶梯：14 / 17 / 20 / 28 / 40 / 64 / 112 */
  --fs-xs: 0.875rem;
  --fs-sm: 0.9375rem;
  --fs-base: 1.0625rem;
  --fs-md: 1.25rem;
  --fs-lg: clamp(1.4rem, 2.4vw, 1.75rem);
  --fs-xl: clamp(1.85rem, 3.6vw, 2.5rem);
  --fs-2xl: clamp(2.4rem, 6vw, 4rem);
  --fs-3xl: clamp(3.4rem, 11vw, 7rem);

  /* 网格与节奏 */
  --shell: 1180px;
  --gap: 24px;
  --gap-lg: 40px;
  --measure: 34em;

  /* 材质 */
  --line-ink: rgba(245, 241, 233, 0.12);
  --line-ink-strong: rgba(245, 241, 233, 0.2);
  --line-paper: rgba(11, 27, 51, 0.12);
  --line-gold: rgba(201, 162, 39, 0.42);
  --shadow-soft: 0 1px 0 rgba(245, 241, 233, 0.04), 0 18px 40px -32px rgba(0, 0, 0, 0.85);
}

/* ---------- 3. 焦点与可访问 ---------- */
:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 1px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -120px;
  z-index: 200;
  display: inline-block;
  padding: 11px 20px;
  background: var(--gold);
  color: var(--ink-900);
  font-weight: 700;
  font-size: var(--fs-sm);
  letter-spacing: 0.04em;
  border-radius: 2px;
  transition: top 0.18s ease;
}
.skip-link:focus { top: 14px; }

/* ---------- 4. 布局骨架 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
}

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

.col-side { grid-column: span 3; }
.col-main { grid-column: span 9; }
.col-half { grid-column: span 6; }
.col-third { grid-column: span 4; }
.col-full { grid-column: 1 / -1; }

.section { padding: clamp(56px, 8vw, 104px) 0; }

.section--ink   { background: var(--ink-900); color: var(--paper); }
.section--deep  { background: var(--ink-800); color: var(--paper); }
.section--paper { background: var(--paper);   color: var(--ink-900); }
.section--sand  { background: var(--sand);    color: var(--ink-900); }

.section--tight { padding: clamp(36px, 5vw, 64px) 0; }

.rule {
  height: 1px;
  width: 100%;
  background: currentColor;
  opacity: 0.16;
}

/* ---------- 5. 排版 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  flex: none;
}

.page-head { padding: clamp(28px, 5vw, 56px) 0 clamp(30px, 4vw, 52px); }

.page-title {
  margin-top: 20px;
  font-size: var(--fs-2xl);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: 0.035em;
}

.page-lede {
  margin-top: 20px;
  max-width: 38ch;
  font-size: var(--fs-md);
  line-height: 1.8;
  opacity: 0.86;
}

.section-head {
  display: grid;
  gap: 14px;
  max-width: 52ch;
  margin-bottom: clamp(28px, 4vw, 46px);
}

.section-title {
  font-size: var(--fs-xl);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: 0.03em;
}

.section-sub {
  font-size: var(--fs-base);
  line-height: 1.85;
  opacity: 0.82;
  max-width: 38em;
}

.prose { max-width: var(--measure); }
.prose p { font-size: var(--fs-base); line-height: 1.85; }
.prose p + p { margin-top: 1.15em; }
.prose h2,
.prose h3 {
  font-weight: 900;
  letter-spacing: 0.03em;
  line-height: 1.3;
}
.prose h2 { font-size: var(--fs-lg); margin-top: 2.2em; }
.prose h3 { font-size: var(--fs-md); margin-top: 1.8em; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: 0.02em;
}

.label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--stone);
}
.label--ink { color: rgba(245, 241, 233, 0.55); }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.2;
  text-align: center;
  transition: background-color 0.2s ease, color 0.2s ease,
              border-color 0.2s ease, transform 0.2s ease;
}
.btn:active { transform: translateY(1px); }

.btn--gold { background: var(--gold); color: var(--ink-900); }
.btn--gold:hover { background: #DDB92F; }

.btn--wine { background: var(--wine); color: var(--paper); }
.btn--wine:hover { background: #83263 5; background-color: #832635; }

.btn--ghost {
  border-color: rgba(245, 241, 233, 0.3);
  color: var(--paper);
}
.btn--ghost:hover { border-color: var(--gold); color: var(--gold); }

.btn--outline {
  border-color: rgba(11, 27, 51, 0.28);
  color: var(--ink-900);
}
.btn--outline:hover { border-color: var(--wine); color: var(--wine); }

.btn--sm {
  min-height: 38px;
  padding: 9px 16px;
  font-size: var(--fs-xs);
}

/* ---------- 7. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--ink-900);
  color: var(--paper);
  border-bottom: 1px solid var(--line-gold);
  box-shadow: var(--shadow-soft);
}

/* 7.1 顶端时段栏 */
.utility-bar {
  max-height: 72px;
  overflow: hidden;
  border-bottom: 1px solid var(--line-ink);
  transition: max-height 0.3s ease, opacity 0.25s ease,
              border-color 0.25s ease;
}

.utility-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
}

.shift-meter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.shift-meter__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px 4px 9px;
  border: 1px solid var(--line-ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: rgba(245, 241, 233, 0.74);
  background: rgba(22, 40, 63, 0.6);
}

.shift-meter__item::before {
  content: "";
  width: 8px;
  height: 8px;
  flex: none;
  background: var(--stone);
}
.shift-meter__item--am::before    { background: var(--am); }
.shift-meter__item--noon::before  { background: var(--noon); }
.shift-meter__item--night::before { background: var(--night); }

.shift-meter__name { font-family: var(--font-sans); letter-spacing: 0.1em; }
.shift-meter__time { color: rgba(245, 241, 233, 0.52); }

.utility-bar__link {
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  color: rgba(245, 241, 233, 0.78);
  border-bottom: 1px solid rgba(201, 162, 39, 0.4);
  padding-bottom: 2px;
  white-space: nowrap;
}
.utility-bar__link:hover { color: var(--gold); }

/* 7.2 居中刊头 */
.masthead {
  padding: 26px 0 22px;
  transition: padding 0.3s ease;
}

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

.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 7px;
  transition: gap 0.3s ease;
}

.brand__mark {
  font-size: var(--fs-2xl);
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.18em;
  text-indent: 0.18em;
  color: var(--paper);
  transition: font-size 0.3s ease, color 0.2s ease;
}
.brand:hover .brand__mark { color: var(--gold); }

.brand__sub {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.34em;
  text-indent: 0.34em;
  text-transform: uppercase;
  color: rgba(245, 241, 233, 0.58);
  transition: font-size 0.3s ease, letter-spacing 0.3s ease;
}

/* 7.3 栏目条 */
.nav-bar {
  background: rgba(22, 40, 63, 0.72);
  border-top: 1px solid var(--line-ink);
}

.nav-bar__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
}

.site-nav { display: block; }

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

.site-nav__list a {
  display: block;
  padding: 15px 17px;
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.05em;
  color: rgba(245, 241, 233, 0.72);
  border-bottom: 2px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease,
              background-color 0.18s ease;
}
.site-nav__list a:hover { color: var(--paper); }

.site-nav__list a[aria-current="page"] {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* 7.4 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 14px 2px;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--paper);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  transition: background-color 0.2s ease;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease, top 0.2s ease;
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after  { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 0;
  transform: rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  top: 0;
  transform: rotate(-45deg);
}

/* 7.5 压缩态 */
.site-header.is-compact .utility-bar {
  max-height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}
.site-header.is-compact .masthead { padding: 10px 0 9px; }
.site-header.is-compact .brand {
  flex-direction: row;
  align-items: baseline;
  gap: 14px;
}
.site-header.is-compact .brand__mark {
  font-size: 1.35rem;
  letter-spacing: 0.16em;
}
.site-header.is-compact .brand__sub {
  font-size: 0.625rem;
  letter-spacing: 0.26em;
}

/* 7.6 滚动进度 */
.scroll-progress {
  height: 2px;
  width: 100%;
  background: rgba(245, 241, 233, 0.06);
}
.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--am), var(--gold) 50%, var(--night));
  transition: width 0.12s linear;
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumbs {
  padding: 20px 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: inherit;
  opacity: 0.68;
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breadcrumbs li + li::before {
  content: "›";
  opacity: 0.5;
}
.breadcrumbs a { border-bottom: 1px solid rgba(201, 162, 39, 0.4); }
.breadcrumbs a:hover { color: var(--gold); opacity: 1; }

/* ---------- 9. 印章数字块 / 数值条 ---------- */
.stamp {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 24px;
  border: 1px solid var(--line-gold);
  background: rgba(201, 162, 39, 0.07);
}

.stamp__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-xl);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.stamp__label {
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  color: rgba(245, 241, 233, 0.6);
}

.stamp--paper {
  border-color: var(--line-paper);
  background: rgba(11, 27, 51, 0.03);
}
.stamp--paper .stamp__value { color: var(--gold-deep); }
.stamp--paper .stamp__label { color: var(--stone); }

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  border: 1px solid var(--line-ink);
}

.stat-row__item {
  padding: 26px 22px;
  border-right: 1px solid var(--line-ink);
  border-bottom: 1px solid var(--line-ink);
}
.stat-row__item:last-child { border-right: 0; }

.stat-row--paper { border-color: var(--line-paper); }
.stat-row--paper .stat-row__item {
  border-right-color: var(--line-paper);
  border-bottom-color: var(--line-paper);
}

/* ---------- 10. 表格 ---------- */
.table-scroll {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  min-width: 520px;
  font-size: var(--fs-sm);
  text-align: left;
}

.data-table caption {
  padding-bottom: 14px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--stone);
}

.data-table th,
.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line-paper);
  vertical-align: top;
  line-height: 1.7;
}

.data-table thead th {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--stone);
  background: rgba(228, 223, 211, 0.6);
  border-bottom-color: rgba(11, 27, 51, 0.2);
}

.data-table tbody tr:nth-child(even) { background: rgba(228, 223, 211, 0.34); }

.data-table .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  white-space: nowrap;
}

.data-table--ink { color: var(--paper); }
.data-table--ink thead th {
  background: var(--ink-800);
  color: rgba(245, 241, 233, 0.7);
  border-bottom-color: var(--line-ink-strong);
}
.data-table--ink th,
.data-table--ink td { border-bottom-color: var(--line-ink); }
.data-table--ink tbody tr:nth-child(even) { background: rgba(22, 40, 63, 0.55); }

/* ---------- 11. 章节目录 ---------- */
.toc {
  position: sticky;
  top: 132px;
  font-size: var(--fs-xs);
}

.toc__title {
  padding-bottom: 12px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--line-ink);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(245, 241, 233, 0.45);
}

.toc__link {
  display: block;
  padding: 9px 0 9px 14px;
  border-left: 2px solid rgba(245, 241, 233, 0.14);
  color: rgba(245, 241, 233, 0.62);
  line-height: 1.55;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.toc__link:hover { color: var(--paper); }

.toc__link[aria-current="true"] {
  color: var(--gold);
  border-left-color: var(--gold);
  font-weight: 700;
}

.toc--paper .toc__title {
  border-bottom-color: var(--line-paper);
  color: var(--stone);
}
.toc--paper .toc__link {
  border-left-color: var(--line-paper);
  color: var(--stone);
}
.toc--paper .toc__link:hover { color: var(--ink-900); }
.toc--paper .toc__link[aria-current="true"] {
  color: var(--wine);
  border-left-color: var(--wine);
}

/* ---------- 12. 条目流 ---------- */
.entry-list { border-top: 1px solid var(--line-paper); }

.entry {
  display: grid;
  grid-template-columns: 148px 1fr;
  gap: 24px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line-paper);
}

.entry__meta {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--stone);
}

.entry__title {
  font-size: var(--fs-md);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.5;
}

.entry__body {
  margin-top: 10px;
  max-width: 38em;
  font-size: var(--fs-base);
  line-height: 1.85;
  opacity: 0.84;
}

.entry-list--ink { border-top-color: var(--line-ink); }
.entry-list--ink .entry { border-bottom-color: var(--line-ink); }
.entry-list--ink .entry__meta { color: rgba(245, 241, 233, 0.52); }

/* ---------- 13. 折叠面板 ---------- */
.accordion { border-top: 1px solid var(--line-paper); }

.accordion__item { border-bottom: 1px solid var(--line-paper); }

.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  padding: 22px 0;
  font-size: var(--fs-base);
  font-weight: 700;
  letter-spacing: 0.015em;
  text-align: left;
  line-height: 1.6;
}
.accordion__trigger:hover { color: var(--wine); }

.accordion__icon {
  flex: none;
  width: 11px;
  height: 11px;
  margin-right: 5px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.22s ease;
}
.accordion__trigger[aria-expanded="true"] .accordion__icon {
  transform: rotate(-135deg);
}

.accordion__panel {
  display: none;
  padding: 0 0 26px;
  max-width: 42em;
  font-size: var(--fs-base);
  line-height: 1.85;
  opacity: 0.86;
}
.accordion__panel[data-open="true"] { display: block; }

.accordion--ink { border-top-color: var(--line-ink); }
.accordion--ink .accordion__item { border-bottom-color: var(--line-ink); }
.accordion--ink .accordion__trigger:hover { color: var(--gold); }

/* ---------- 14. 时段色带 ---------- */
.shift-band {
  display: flex;
  width: 100%;
  height: 5px;
}
.shift-band span { flex: 1 1 0; }
.shift-band__am    { background: var(--am); }
.shift-band__noon  { background: var(--noon); }
.shift-band__night { background: var(--night); }

.shift-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border: 1px solid var(--line-ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}
.shift-chip--am    { border-color: rgba(159, 199, 194, 0.5); color: var(--am); }
.shift-chip--noon  { border-color: rgba(224, 164, 74, 0.5);  color: var(--noon); }
.shift-chip--night { border-color: rgba(76, 94, 158, 0.7);   color: #93A2D8; }

/* ---------- 15. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--ink-800);
  border: 1px solid var(--line-ink);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.84) contrast(1.05) brightness(0.94);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg,
              rgba(11, 27, 51, 0.42) 0%,
              rgba(11, 27, 51, 0) 42%,
              rgba(11, 27, 51, 0.62) 100%);
}

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.media-frame--wide   { aspect-ratio: 16 / 9; }
.media-frame--tall   { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--band   { aspect-ratio: 21 / 9; }

.media-frame--paper {
  background: var(--sand);
  border-color: var(--line-paper);
}
.media-frame--paper::after {
  background: linear-gradient(180deg,
              rgba(11, 27, 51, 0.18) 0%,
              rgba(11, 27, 51, 0) 45%,
              rgba(11, 27, 51, 0.42) 100%);
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--gap);
}

/* ---------- 16. 显现与返回顶部 ---------- */
body.js-reveal .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s cubic-bezier(0.2, 0.6, 0.3, 1),
              transform 0.5s cubic-bezier(0.2, 0.6, 0.3, 1);
}
body.js-reveal .reveal.is-visible {
  opacity: 1;
  transform: none;
}

.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 70;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  background: var(--ink-800);
  border: 1px solid var(--line-gold);
  color: var(--gold);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease,
              background-color 0.2s ease, color 0.2s ease;
}
.to-top.is-visible { opacity: 1; visibility: visible; }
.to-top:hover { background: var(--gold); color: var(--ink-900); }

.to-top__arrow {
  display: block;
  width: 10px;
  height: 10px;
  border-left: 1.5px solid currentColor;
  border-top: 1.5px solid currentColor;
  transform: rotate(45deg) translate(1px, 1px);
}

/* ---------- 17. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--ink-900);
  color: var(--paper);
  padding: clamp(48px, 7vw, 84px) 0 30px;
  font-size: var(--fs-sm);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, minmax(0, 1fr));
  gap: 32px;
}

.footer__brand-link {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer__mark {
  font-size: 1.9rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  line-height: 1;
  color: var(--gold);
}

.footer__tagline {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: rgba(245, 241, 233, 0.58);
}

.footer__contact {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.footer__contact-row {
  display: grid;
  gap: 3px;
}

.footer__contact dt {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(245, 241, 233, 0.42);
}

.footer__contact dd {
  color: rgba(245, 241, 233, 0.84);
  line-height: 1.7;
  word-break: break-word;
}

.footer__note {
  margin-top: 20px;
  max-width: 42ch;
  font-size: var(--fs-xs);
  line-height: 1.75;
  color: rgba(245, 241, 233, 0.5);
}

.footer__cta { margin-top: 22px; }

.footer__col-title {
  padding-bottom: 14px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line-ink);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--paper);
}

.footer__list a {
  display: block;
  padding: 7px 0;
  color: rgba(245, 241, 233, 0.66);
  transition: color 0.18s ease, padding-left 0.18s ease;
}
.footer__list a:hover {
  color: var(--gold);
  padding-left: 5px;
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid var(--line-ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: rgba(245, 241, 233, 0.5);
}

.footer__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.footer__legal-links a { border-bottom: 1px solid rgba(245, 241, 233, 0.22); }
.footer__legal-links a:hover { color: var(--gold); border-bottom-color: var(--gold); }

.footer__icp { letter-spacing: 0.04em; }

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer__grid {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 30px;
  }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 880px) {
  html { scroll-padding-top: 118px; }

  .shell { padding: 0 20px; }

  .col-side,
  .col-main,
  .col-half,
  .col-third { grid-column: 1 / -1; }

  .grid { gap: 18px; }

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

  .nav-bar__inner { justify-content: flex-start; }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--ink-800);
    border: 1px solid var(--line-ink-strong);
    border-top: 2px solid var(--gold);
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    box-shadow: 0 26px 40px -30px rgba(0, 0, 0, 0.95);
  }

  .site-nav[data-open="true"] { display: block; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px;
  }

  .site-nav__list a {
    padding: 15px 12px;
    border-bottom: 1px solid var(--line-ink);
    border-left: 3px solid transparent;
  }

  .site-nav__list li:last-child a { border-bottom: 0; }

  .site-nav__list a[aria-current="page"] {
    color: var(--gold);
    border-bottom-color: var(--line-ink);
    border-left-color: var(--gold);
    background: rgba(201, 162, 39, 0.08);
  }

  .toc {
    position: static;
    top: auto;
  }
  .toc__list {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 10px;
  }
  .toc__link {
    border-left: 0;
    border-bottom: 2px solid var(--line-paper);
    padding: 7px 2px;
  }

  .entry { grid-template-columns: 1fr; gap: 8px; }

  .to-top { right: 16px; bottom: 16px; }
}

@media (max-width: 620px) {
  body { font-size: 1rem; }

  .shell { padding: 0 18px; }

  .utility-bar__inner {
    justify-content: space-between;
    gap: 10px;
    padding: 9px 0;
  }

  .shift-meter { gap: 6px; }
  .shift-meter__item {
    padding: 3px 8px 3px 7px;
    font-size: 0.6875rem;
    gap: 6px;
  }
  .shift-meter__time { display: none; }

  .masthead { padding: 20px 0 16px; }
  .brand__mark { font-size: var(--fs-xl); }
  .brand__sub { font-size: 0.625rem; letter-spacing: 0.22em; }

  .stat-row { grid-template-columns: 1fr; }
  .stat-row__item { border-right: 0; }

  .footer__grid { grid-template-columns: 1fr 1fr; gap: 26px; }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 420px) {
  .footer__grid { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
}

/* ---------- 19. 减少动态 ---------- */
@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;
    scroll-behavior: auto !important;
  }

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

  .scroll-progress__bar { transition: none; }
}