:root {
  --color-surface: #ecebeb;
  --color-surface-alt: #e4e2e2;
  --color-surface-deep: #d9d6d6;
  --color-ink: #4b3e40;
  --color-ink-soft: #746264;
  --color-ink-muted: #897678;
  --color-line: #cfcccc;
  --color-primary: #c73844;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e7d2d4;
  --color-accent: #a46909;
  --color-accent-ink: #ffffff;
  --color-highlight: #dfd4c2;
  --color-focus: #945b00;
  --color-contrast-surface: #1f1314;
  --color-contrast-ink: #e7e4e4;
  --color-contrast-line: #4b4142;
  --color-contrast-accent: #f29a0d;
  --overlay-scrim: linear-gradient(180deg, rgba(31, 19, 20, 0.35) 0%, rgba(31, 19, 20, 0.72) 55%, rgba(31, 19, 20, 0.92) 100%);
  --font-heading: "Songti SC", STSong, "Source Han Serif SC", SimSun, serif;
  --font-body: "Songti SC", STSong, "Source Han Serif SC", SimSun, serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 11.4px;
  --text-sm: 14.3px;
  --text-base: 16px;
  --text-lg: 20.0px;
  --text-xl: 25.0px;
  --text-2xl: 31.2px;
  --text-3xl: 39.1px;
  --text-4xl: 48.8px;
  --text-display: clamp(40px, 8.1vw, 104px);
  --text-figure: clamp(33px, 5.9vw, 75px);
  --weight-heading: 552;
  --weight-body: 400;
  --leading-body: 1.83;
  --leading-heading: 1.22;
  --tracking-heading: 0.012em;
  --radius-sm: 1px;
  --radius-md: 1px;
  --radius-lg: 1px;
  --radius-pill: 1px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: none;
  --shadow-2: none;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1080px;
  --measure: 72ch;
  --gutter: 32px;
  --section-y: 92px;
  --section-y-lg: 129px;
}

/* ==================== reset ==================== */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--space-8) + var(--space-4));
}
body {
  margin: 0;
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}
img, svg, video, picture { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { background: none; border: 0; padding: 0; font: inherit; color: inherit; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, dt, hr { margin: 0; }
hr { border: 0; }
table { border-collapse: collapse; width: 100%; }
:focus-visible {
  outline: calc(var(--border-thin) * 2) solid var(--color-focus);
  outline-offset: calc(var(--border-thin) * 2);
}

/* ==================== 中文排版 ==================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-wrap: balance;
}
h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }
time, .mono, .num, .stamp, .stamp__value, .entry__id, .entry__time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.lead { font-size: var(--text-xl); line-height: 1.5; color: var(--color-ink-soft); }
.small { font-size: var(--text-sm); color: var(--color-ink-muted); }
.muted { color: var(--color-ink-soft); }
.text-center { text-align: center; }
.visually-hidden {
  position: absolute; width: var(--border-thin); height: var(--border-thin);
  padding: 0; margin: calc(var(--border-thin) * -1); overflow: hidden;
  clip-path: inset(50%); white-space: nowrap; border: 0;
}
.display-title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-weight: var(--weight-heading);
  text-align: center;
  color: var(--color-ink);
}
.figure-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

/* ==================== 布局 ==================== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}
.stack > * + * { margin-top: var(--space-2); }
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }
.section { padding-block: var(--section-y); }
.section--tight { padding-block: var(--space-6); }
.section--lg { padding-block: var(--section-y-lg); }
.section--divided {
  position: relative;
  border-top: var(--border-thin) solid var(--color-line);
}
.section--divided::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: calc(var(--space-1) / 2);
  height: var(--border-thin);
  background-color: var(--color-line);
}

/* ==================== 分隔与回纹 ==================== */
.rule { height: var(--border-thin); background-color: var(--color-line); }
.rule--double {
  height: calc(var(--space-1) / 2);
  background-color: transparent;
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.rule--contrast { background-color: var(--color-contrast-line); border-color: var(--color-contrast-line); }
.meander {
  display: inline-block;
  width: var(--space-2);
  height: var(--space-1);
  border: var(--border-thin) solid currentColor;
  border-right: 0;
  border-radius: var(--radius-sm);
}
.meander--flip { border-right: var(--border-thin) solid currentColor; border-left: 0; }
.meander__dot {
  display: inline-block;
  width: var(--space-1);
  height: var(--space-1);
  background-color: var(--color-primary);
  transform: rotate(45deg);
}
.mark {
  display: inline-block;
  width: calc(var(--border-thin) * 3);
  height: var(--text-xs);
  background-color: var(--color-primary);
  vertical-align: middle;
  margin-inline: var(--space-1);
}

/* ==================== 题头 ==================== */
.page-head { text-align: center; padding-block: var(--space-6) var(--space-4); }
.page-head__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}
.page-head__title { margin-top: var(--space-2); }
.page-head__lead {
  max-width: var(--measure);
  margin: var(--space-2) auto 0;
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-ink-soft);
}
.page-head__meta {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.section-head { text-align: center; padding-block: var(--space-2) var(--space-4); }
.section-head__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}
.section-head__title { margin-top: var(--space-1); font-size: var(--text-2xl); }
.section-head__note {
  max-width: var(--measure);
  margin: var(--space-1) auto 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* ==================== 按钮 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: calc(var(--space-1) / 2);
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-alt);
  color: var(--color-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  transition: background-color 160ms ease-out, color 160ms ease-out, border-color 160ms ease-out;
}
.btn:hover { border-color: var(--color-primary); background-color: var(--color-primary-soft); }
.btn--primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.btn--primary:hover {
  background-color: color-mix(in srgb, var(--color-primary) 86%, var(--color-ink));
  border-color: color-mix(in srgb, var(--color-primary) 86%, var(--color-ink));
  color: var(--color-primary-ink);
}
.btn--ghost {
  background-color: transparent;
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.btn--ghost:hover {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 14%, transparent);
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}
.btn--line {
  background-color: transparent;
  border-color: var(--color-ink-soft);
  color: var(--color-ink);
}
.btn--line:hover { border-color: var(--color-primary); color: var(--color-primary); background-color: transparent; }

/* ==================== 面包屑 ==================== */
.breadcrumb { font-size: var(--text-xs); color: var(--color-ink-muted); }
.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1); }
.breadcrumb li { display: inline-flex; align-items: center; gap: var(--space-1); }
.breadcrumb li + li::before { content: "／"; color: var(--color-line); }
.breadcrumb a { color: var(--color-ink-soft); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb [aria-current="page"] { color: var(--color-ink); }

/* ==================== 标签 / 徽标 / 状态 ==================== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: calc(var(--space-1) / 2);
  padding: calc(var(--space-1) / 4) var(--space-1);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-alt);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
}
.tag--primary {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.tag--accent { background-color: transparent; border-color: var(--color-accent); color: var(--color-accent); }
.tag--contrast {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.badge {
  display: inline-block;
  padding: calc(var(--space-1) / 4) var(--space-1);
  border: var(--border-thin) solid var(--color-accent);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-accent);
}
.badge--filled { background-color: var(--color-accent); color: var(--color-accent-ink); }
.status {
  display: inline-flex;
  align-items: center;
  gap: calc(var(--space-1) / 2);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-soft);
}
.status__dot {
  width: calc(var(--border-thin) * 6);
  height: calc(var(--border-thin) * 6);
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
}
.status--live .status__dot { background-color: var(--color-accent); }
.status--calm .status__dot { background-color: var(--color-ink-muted); }

/* ==================== 条目行 ==================== */
.entry {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: calc(var(--space-1) / 2) var(--space-2);
  align-items: baseline;
  padding-block: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.entry__id { font-size: var(--text-xs); letter-spacing: 0.06em; color: var(--color-accent); }
.entry__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}
.entry__desc { grid-column: 2 / -1; font-size: var(--text-sm); color: var(--color-ink-soft); }
.entry__meta {
  grid-column: 2 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
}
.entry__time { font-size: var(--text-xs); color: var(--color-ink-muted); }

/* ==================== 内容块 ==================== */
.framed {
  position: relative;
  padding: var(--space-3);
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
}
.framed::after {
  content: "";
  position: absolute;
  inset: calc(var(--space-1) / 2);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-line) 78%, transparent);
  border-radius: var(--radius-sm);
  pointer-events: none;
}
.callout {
  position: relative;
  background-color: var(--color-highlight);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
}
.callout__title {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  margin-bottom: var(--space-1);
}
.callout__title::before {
  content: "";
  width: calc(var(--border-thin) * 3);
  height: var(--text-lg);
  background-color: var(--color-primary);
}
.panel--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
}
.panel--contrast a { color: var(--color-contrast-accent); border-bottom: var(--border-thin) solid var(--color-contrast-accent); }
.panel--contrast .num, .panel--contrast .figure-num { color: var(--color-contrast-accent); }
.prose { max-width: var(--measure); }
.prose p { margin-bottom: var(--space-2); }
.prose h2 { margin-top: var(--space-6); margin-bottom: var(--space-2); }
.prose h3 { margin-top: var(--space-4); margin-bottom: var(--space-1); }
.prose ul, .prose ol { margin-bottom: var(--space-2); }
.prose li { position: relative; padding-left: var(--space-3); margin-bottom: calc(var(--space-1) / 2); }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(var(--leading-body) * 0.5em - var(--border-thin) * 2);
  width: calc(var(--border-thin) * 4);
  height: calc(var(--border-thin) * 4);
  background-color: var(--color-primary);
}
.prose ol { counter-reset: prose; }
.prose ol li { counter-increment: prose; }
.prose ol li::before {
  content: counter(prose, decimal-leading-zero);
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
}
.prose blockquote {
  border-left: calc(var(--border-thin) * 3) solid var(--color-primary);
  padding-left: var(--space-2);
  color: var(--color-ink-soft);
}
.prose code {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  background-color: var(--color-surface-deep);
  padding: 0 calc(var(--space-1) / 4);
  border-radius: var(--radius-sm);
}

/* ==================== 表格 ==================== */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-alt);
}
.table { min-width: 640px; font-size: var(--text-sm); }
.table caption {
  padding: var(--space-2);
  text-align: left;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.table th {
  background-color: var(--color-surface-deep);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  text-align: left;
  letter-spacing: var(--tracking-heading);
  padding: var(--space-1) var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  white-space: nowrap;
}
.table td {
  padding: var(--space-1) var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  vertical-align: top;
}
.table tbody tr:last-child td { border-bottom: 0; }
.table .num { color: var(--color-accent); white-space: nowrap; }

/* ==================== 折叠 ==================== */
.disclosure { border-top: var(--border-thin) solid var(--color-line); }
.disclosure__trigger {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  text-align: left;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}
.disclosure__label { display: inline-flex; align-items: center; gap: var(--space-1); }
.disclosure__label::before {
  content: "";
  width: calc(var(--border-thin) * 3);
  height: var(--text-lg);
  background-color: var(--color-primary);
}
.disclosure__hint {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.08em;
}
.disclosure__trigger[aria-expanded="true"] .disclosure__hint--more { display: none; }
.disclosure__trigger[aria-expanded="false"] .disclosure__hint--less { display: none; }
.disclosure__panel { padding-bottom: var(--space-3); }
.disclosure__panel[hidden] { display: none; }

/* ==================== 图片容器（图录式） ==================== */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background-color: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
}
.media--3x2 { aspect-ratio: 3 / 2; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--portrait { aspect-ratio: 3 / 4; }
.media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media::after {
  content: "";
  position: absolute;
  inset: calc(var(--space-1) / 2);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-contrast-ink) 30%, transparent);
  border-radius: var(--radius-sm);
  pointer-events: none;
}
.media--placeholder {
  background-color: color-mix(in srgb, var(--color-surface-deep) 82%, var(--color-surface));
}
.media__scrim { position: absolute; inset: 0; background: var(--overlay-scrim); }
.media__caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.4;
  color: var(--color-contrast-ink);
}
.media__label { position: absolute; left: var(--space-2); top: var(--space-2); z-index: 1; }

/* ==================== 长文目录 ==================== */
.toc { font-size: var(--text-sm); }
.toc__title {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-line);
  margin-bottom: var(--space-1);
}
.toc__title::before {
  content: "";
  width: calc(var(--border-thin) * 3);
  height: var(--text-xs);
  background-color: var(--color-primary);
}
.toc__list { display: grid; gap: calc(var(--space-1) / 4); }
.toc__link {
  position: relative;
  display: block;
  padding: calc(var(--space-1) / 2) var(--space-2);
  color: var(--color-ink-soft);
  border-left: var(--border-thin) solid var(--color-line);
  transition: color 160ms ease-out;
}
.toc__link::before {
  content: "";
  position: absolute;
  left: calc(var(--border-thin) * -1);
  top: 0; bottom: 0;
  width: calc(var(--border-thin) * 3);
  background-color: var(--color-primary);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 180ms ease-out;
}
.toc__link:hover { color: var(--color-ink); }
.toc__link[aria-current="true"] { color: var(--color-ink); }
.toc__link[aria-current="true"]::before { transform: scaleY(1); }

/* ==================== 头部 ==================== */
.skip-link {
  position: fixed;
  left: var(--space-2);
  top: var(--space-1);
  z-index: 200;
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  transform: translateY(-200%);
  transition: transform 180ms ease-out;
}
.skip-link:focus { transform: translateY(0); }
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: color-mix(in srgb, var(--color-surface) 92%, transparent);
  backdrop-filter: saturate(140%) blur(6px);
}
.site-header__inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-2) var(--space-3) 0;
}
.island {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-lg);
}
.island::after {
  content: "";
  position: absolute;
  inset: calc(var(--space-1) / 2);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-contrast-line) 72%, transparent);
  border-radius: var(--radius-sm);
  pointer-events: none;
}
.brand { display: flex; align-items: center; gap: var(--space-1); color: var(--color-contrast-ink); }
.brand__mark {
  display: block;
  width: calc(var(--border-thin) * 3);
  height: var(--space-3);
  background-color: var(--color-primary);
}
.brand__text { display: block; }
.brand__name {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.08em;
  line-height: 1.2;
}
.brand__tagline {
  display: block;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.nav { margin-inline: auto; }
.nav__list { display: flex; align-items: center; gap: var(--space-1); }
.nav__item { display: block; }
.nav__link {
  position: relative;
  display: inline-block;
  padding: var(--space-1) var(--space-1) var(--space-1) var(--space-2);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  white-space: nowrap;
  color: var(--color-contrast-ink);
  transition: color 160ms ease-out;
}
.nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: calc(var(--border-thin) * 3);
  height: 0;
  background-color: var(--color-primary);
  transform: translateY(-50%);
  transition: height 180ms ease-out;
}
.nav__link:hover::before,
.nav__link:focus-visible::before { height: var(--space-2); }
.nav__link:hover { color: color-mix(in srgb, var(--color-contrast-ink) 82%, var(--color-contrast-accent)); }
.nav__link[aria-current="page"] { color: var(--color-primary-ink); }
.nav__link[aria-current="page"]::before { height: var(--space-3); }
.header-meta { display: flex; align-items: center; gap: var(--space-2); }
.stamp {
  display: inline-flex;
  align-items: center;
  gap: calc(var(--space-1) / 2);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}
.stamp__dot {
  display: inline-block;
  width: calc(var(--border-thin) * 6);
  height: calc(var(--border-thin) * 6);
  border-radius: var(--radius-pill);
  background-color: var(--color-contrast-accent);
  animation: stamp-pulse 2.4s ease-in-out infinite;
}
.stamp__value {
  font-size: var(--text-xs);
  color: var(--color-contrast-accent);
  transition: color 220ms ease-out, opacity 220ms ease-out;
}
.stamp__value--tick { animation: accent-tick 400ms ease-out; }
@keyframes stamp-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}
@keyframes accent-tick {
  0% { opacity: 0.35; }
  100% { opacity: 1; }
}
.nav-toggle {
  display: none;
  align-items: center;
  gap: calc(var(--space-1) / 2);
  padding: var(--space-1);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  color: var(--color-contrast-ink);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
}
.nav-toggle__bars {
  position: relative;
  display: block;
  width: var(--space-2);
  height: var(--border-thin);
  background-color: currentColor;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: var(--border-thin);
  background-color: currentColor;
  transition: transform 180ms ease-out;
}
.nav-toggle__bars::before { top: calc(var(--space-1) / -2); }
.nav-toggle__bars::after { top: calc(var(--space-1) / 2); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background-color: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(calc(var(--space-1) / 2)) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(calc(var(--space-1) / -2)) rotate(-45deg); }
.scroll-progress {
  height: calc(var(--border-thin) * 2);
  margin-top: var(--space-2);
  background-color: color-mix(in srgb, var(--color-line) 70%, transparent);
}
.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background-color: var(--color-primary);
  transition: width 120ms linear;
}
.site-header :focus-visible { outline-color: var(--color-contrast-accent); }

/* ==================== 页脚 ==================== */
.site-footer {
  margin-top: var(--section-y);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-bottom: var(--space-6);
}
.site-footer__crest {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding-block: var(--space-6) var(--space-2);
  color: var(--color-contrast-line);
}
.site-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--gutter);
  padding-block: var(--space-4) var(--space-6);
}
.footer-brand {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: 0.08em;
  color: var(--color-contrast-ink);
}
.footer-brand::after {
  content: "";
  display: block;
  width: calc(var(--border-thin) * 3);
  height: var(--space-1);
  margin-top: var(--space-1);
  background-color: var(--color-primary);
}
.footer-note {
  margin-top: var(--space-2);
  max-width: 34ch;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}
.footer-meta { margin-top: var(--space-2); }
.footer-meta__label {
  margin-right: calc(var(--space-1) / 2);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: color-mix(in srgb, var(--color-contrast-ink) 64%, transparent);
}
.footer-col__title {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.14em;
  color: var(--color-contrast-ink);
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  margin-bottom: var(--space-2);
}
.footer-col__title::before {
  content: "";
  width: calc(var(--border-thin) * 3);
  height: var(--text-sm);
  background-color: var(--color-primary);
}
.footer-list { display: grid; gap: calc(var(--space-1) / 2); }
.footer-list a {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
  transition: color 160ms ease-out;
}
.footer-list a:hover { color: var(--color-contrast-accent); }
.footer-contact { display: grid; gap: calc(var(--space-1) / 4); }
.footer-contact dt {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}
.footer-contact dd {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  word-break: break-all;
}
.footer-contact dd + dt { margin-top: var(--space-1); }
.footer-col__note { margin-top: var(--space-2); font-size: var(--text-sm); }
.footer-col__note a {
  color: var(--color-contrast-accent);
  border-bottom: var(--border-thin) solid var(--color-contrast-accent);
}
.site-footer .rule--contrast { margin-block: 0; }
.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-top: var(--space-3);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}
.site-footer__legal { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.site-footer__legal a { color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent); }
.site-footer__legal a:hover { color: var(--color-contrast-accent); }
.site-footer__meta { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.site-footer__note {
  margin-top: var(--space-2);
  max-width: var(--measure);
  font-size: var(--text-xs);
  line-height: 1.6;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}
.site-footer :focus-visible { outline-color: var(--color-contrast-accent); }

/* ==================== 返回顶部 ==================== */
.to-top {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: calc(var(--space-1) / 2);
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(var(--space-1));
  transition: opacity 200ms ease-out, transform 200ms ease-out, visibility 200ms ease-out;
}
.to-top::before {
  content: "";
  width: calc(var(--border-thin) * 3);
  height: var(--text-xs);
  background-color: var(--color-primary);
}
.to-top[data-visible] { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { border-color: var(--color-contrast-accent); color: var(--color-contrast-accent); }

/* ==================== 显现 ==================== */
[data-reveal] {
  opacity: 0;
  transform: translateY(var(--space-1));
  transition: opacity 200ms ease-out, transform 200ms ease-out;
}
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }

/* ==================== 响应式 ==================== */
@media (max-width: 960px) {
  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5 { grid-column: span 3; }
  .span-6, .span-7, .span-8, .span-9, .span-12 { grid-column: span 6; }
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + var(--space-1));
    z-index: 10;
    display: none;
    margin-inline: 0;
    padding: var(--space-2);
    background-color: var(--color-contrast-surface);
    border: var(--border-thin) solid var(--color-contrast-line);
    border-radius: var(--radius-lg);
  }
  .site-header[data-open] .nav { display: block; }
  .nav__list { flex-direction: column; align-items: stretch; gap: calc(var(--space-1) / 2); }
  .nav__link { display: block; padding: var(--space-1) var(--space-2); }
  .nav__link::before { top: 0; bottom: 0; height: auto; transform: none; }
  .nav__link:hover::before, .nav__link:focus-visible::before { height: auto; }
  .nav__link[aria-current="page"]::before { height: auto; }
  .nav-toggle { display: inline-flex; }
  .brand__tagline { display: none; }
}
@media (max-width: 600px) {
  .grid { grid-template-columns: minmax(0, 1fr); }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8, .span-9, .span-12 { grid-column: span 1; }
  .site-footer__grid { grid-template-columns: 1fr; }
  .header-meta__cta { display: none; }
  .stamp__label { display: none; }
  .island { gap: var(--space-1); padding: var(--space-1) var(--space-2); }
  .entry { grid-template-columns: auto minmax(0, 1fr); }
  .entry__time { grid-column: 2 / -1; }
  .to-top { right: var(--space-2); bottom: var(--space-2); }
}

/* ==================== 动效降级 ==================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .scroll-progress__bar { transition: none; }
  .to-top { transform: none; }
}