:root {
  --color-surface: #fdfdfd;
  --color-surface-alt: #f3f3f3;
  --color-surface-deep: #e5e5e5;
  --color-ink: #393432;
  --color-ink-soft: #665f5b;
  --color-ink-muted: #837b77;
  --color-line: #dad9d8;
  --color-primary: #c94c17;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #f6e4dd;
  --color-accent: #7d770d;
  --color-accent-ink: #ffffff;
  --color-highlight: #e6e5d2;
  --color-focus: #7a7406;
  --color-contrast-surface: #221510;
  --color-contrast-ink: #e7e5e4;
  --color-contrast-line: #4d433f;
  --color-contrast-accent: #e7dd18;
  --overlay-scrim: linear-gradient(180deg, rgba(34, 21, 16, 0.35) 0%, rgba(34, 21, 16, 0.72) 55%, rgba(34, 21, 16, 0.92) 100%);
  --font-heading: "Source Han Sans SC", "Noto Sans SC", SimHei, "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 11.7px;
  --text-sm: 15.6px;
  --text-base: 18px;
  --text-lg: 24.0px;
  --text-xl: 32.0px;
  --text-2xl: 42.6px;
  --text-3xl: 56.8px;
  --text-4xl: 75.8px;
  --text-display: clamp(49px, 10.2vw, 130px);
  --text-figure: clamp(41px, 7.3vw, 94px);
  --weight-heading: 806;
  --weight-body: 400;
  --leading-body: 1.7;
  --leading-heading: 1.16;
  --tracking-heading: -0.01em;
  --radius-sm: 0px;
  --radius-md: 0px;
  --radius-lg: 0px;
  --radius-pill: 0px;
  --border-thin: 2px;
  --border-thick: 2px;
  --shadow-1: 4px 4px 0 #393432;
  --shadow-2: 8px 8px 0 #393432;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1220px;
  --measure: 70ch;
  --gutter: 16px;
  --section-y: 82px;
  --section-y-lg: 115px;
}

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

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

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);
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

p { margin: 0 0 var(--space-3); }
p:last-child { margin-bottom: 0; }

ul, ol { margin: 0 0 var(--space-3); padding-left: 1.2em; }
li { margin: 0; }

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

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

a {
  color: var(--color-primary);
  text-decoration: none;
  text-underline-offset: 3px;
}
a:hover { text-decoration: underline; }

hr {
  border: 0;
  border-top: var(--border-thick) solid var(--color-line);
  margin: var(--space-4) 0;
}

::selection {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}

:target { scroll-margin-top: calc(var(--space-8) + var(--space-2)); }

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

/* ============ 2. 排版工具 ============ */
.kicker {
  display: block;
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.section-title {
  font-size: var(--text-2xl);
  margin: 0 0 var(--space-2);
}

.section-sub {
  font-size: var(--text-base);
  color: var(--color-ink-soft);
  max-width: var(--measure);
  margin: 0;
}

.prose { max-width: var(--measure); }
.prose h2 { font-size: var(--text-xl); margin: var(--space-4) 0 var(--space-2); }
.prose h3 { font-size: var(--text-lg); margin: var(--space-3) 0 var(--space-1); }
.prose p,
.prose li { font-size: var(--text-base); }
.prose strong { font-weight: 700; }

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* ============ 3. 容器与栅格 ============ */
.wrap {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--top { padding-top: var(--section-y-lg); padding-bottom: var(--section-y); }

.grid {
  display: grid;
  gap: var(--gutter);
  grid-template-columns: repeat(6, minmax(0, 1fr));
}
.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--6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

/* ============ 4. 跳转链接 ============ */
.skip-link {
  position: absolute;
  top: 0;
  left: -9999px;
  z-index: 400;
  padding: 12px 18px;
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border: var(--border-thick) solid var(--color-ink);
  box-shadow: var(--shadow-1);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-sm);
}
.skip-link:focus {
  left: var(--space-2);
  top: var(--space-2);
  text-decoration: none;
}

/* ============ 5. 滚动进度条 ============ */
.scroll-meter {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-color: var(--color-primary);
  z-index: 300;
  pointer-events: none;
}

/* ============ 6. 页头 ============ */
.site-header {
  position: relative;
  background-color: var(--color-surface);
  border-bottom: var(--border-thick) solid var(--color-ink);
}

.header-ruler {
  height: 12px;
  background-color: var(--color-contrast-surface);
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-contrast-accent) 0 2px,
    transparent 2px 24px
  );
  border-bottom: var(--border-thin) solid var(--color-ink);
}

.header-inner {
  display: flex;
  align-items: stretch;
  flex-wrap: wrap;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.brand {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 12px var(--space-3) 12px 0;
  color: var(--color-ink);
  text-decoration: none;
  border-right: var(--border-thin) solid var(--color-line);
}
.brand-link:hover { text-decoration: none; }
.brand-link:hover .brand-name { color: var(--color-primary); }

.brand-mark {
  flex: 0 0 auto;
  padding: 5px 10px;
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  letter-spacing: var(--tracking-heading);
  transition: color 140ms linear;
}

.brand-line {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  margin-block: 12px;
  padding: 10px 14px;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-ink);
  box-shadow: var(--shadow-1);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: transform 150ms ease, box-shadow 150ms ease, background-color 150ms ease;
}
.nav-toggle:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--color-ink);
}
.nav-toggle[aria-expanded="true"] {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.nav-toggle-bars {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 20px;
  height: 14px;
}
.nav-toggle-bars i {
  display: block;
  width: 100%;
  height: 2px;
  background-color: currentColor;
}

.site-nav {
  flex: 1 1 auto;
  display: flex;
  align-items: stretch;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: stretch;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: var(--border-thin) solid var(--color-line);
}

.nav-item { display: flex; }

.nav-link {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  padding: 12px 14px;
  color: var(--color-ink);
  text-decoration: none;
  border-right: var(--border-thin) solid var(--color-line);
  transition: background-color 140ms linear, color 140ms linear, box-shadow 140ms linear;
}
.nav-link:hover {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  text-decoration: none;
}
.nav-link[aria-current="page"] {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: inset 0 -4px 0 var(--color-ink);
}
.nav-link[aria-current="page"]:hover {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.nav-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1;
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  transition: color 140ms linear;
}
.nav-link:hover .nav-num { color: var(--color-primary); }
.nav-link[aria-current="page"] .nav-num { color: var(--color-primary-ink); }

.nav-label {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
}

.header-pos {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  align-self: center;
  margin-left: var(--space-3);
  padding: 8px 14px;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-left: var(--border-thick) solid var(--color-primary);
}

.pos-label {
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-contrast-line);
}

.pos-value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

/* ============ 7. 页脚 ============ */
.site-footer {
  margin-top: var(--section-y-lg);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thick) solid var(--color-ink);
}

.footer-inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--section-y) var(--gutter) var(--space-4);
}

.footer-brandline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-4);
  border-bottom: var(--border-thick) solid var(--color-contrast-line);
}

.footer-mark {
  padding: 5px 10px;
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, var(--color-contrast-surface));
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-3);
}

.footer-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background-color: color-mix(in srgb, var(--color-contrast-surface) 86%, var(--color-contrast-ink));
  border: var(--border-thin) solid var(--color-contrast-line);
}

.panel-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.panel-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-contrast-accent);
}

.panel-title {
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-contrast-ink);
}

.footer-index,
.legal-links,
.legal-list,
.contact-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 140ms linear, border-color 140ms linear, padding-left 140ms linear;
}
.footer-link:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
  padding-left: 6px;
  text-decoration: none;
}

.footer-link-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-contrast-ink) 55%, var(--color-contrast-surface));
}

.panel-text {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--color-contrast-ink);
}

.panel-text--muted {
  font-size: var(--text-xs);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, var(--color-contrast-surface));
}

.contact-row {
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr);
  gap: 10px;
  padding: 6px 0;
  border-bottom: 1px solid color-mix(in srgb, var(--color-contrast-line) 70%, transparent);
}
.contact-row:last-child { border-bottom: 0; }

.contact-key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, var(--color-contrast-surface));
}

.contact-val {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-contrast-ink);
  word-break: break-word;
}

.contact-val--mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: var(--border-thick) solid var(--color-contrast-line);
}

.footer-copy {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-contrast-ink);
}

.footer-copy--muted {
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, var(--color-contrast-surface));
}

.site-footer :focus-visible { outline-color: var(--color-contrast-accent); }

/* ============ 8. 通用按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  background-color: var(--color-surface);
  color: var(--color-ink);
  border: var(--border-thick) solid var(--color-ink);
  box-shadow: var(--shadow-1);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.3;
  text-decoration: none;
  cursor: pointer;
  transition: transform 150ms ease, box-shadow 150ms ease, background-color 150ms ease, color 150ms ease;
}
.btn:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--color-ink);
  text-decoration: none;
}
.btn:active {
  transform: translate(4px, 4px);
  box-shadow: none;
}

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

.btn--accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}
.btn--accent:hover { background-color: var(--color-accent); color: var(--color-accent-ink); }

.btn--block { display: flex; width: 100%; justify-content: space-between; }

.btn-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  opacity: 0.8;
}

/* ============ 9. 面包屑与索引栏 ============ */
.breadcrumb {
  border-bottom: var(--border-thin) solid var(--color-line);
  background-color: var(--color-surface);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: var(--space-2) 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}

.breadcrumb-item { display: flex; align-items: center; gap: 8px; }
.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: var(--color-ink-muted);
}
.breadcrumb-item a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  padding-bottom: 1px;
  transition: color 140ms linear, border-color 140ms linear;
}
.breadcrumb-item a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  text-decoration: none;
}
.breadcrumb-item[aria-current] { color: var(--color-ink); }

.index-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 12px var(--space-3);
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-ink);
  box-shadow: var(--shadow-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
}

.index-bar-num { color: var(--color-accent); }

.index-bar-path { color: var(--color-ink-soft); }
.index-bar-path strong { color: var(--color-ink); font-weight: 700; }

/* ============ 10. 条目行 ============ */
.entry-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thick) solid var(--color-ink);
}

.entry-row {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr) auto;
  gap: var(--space-2);
  align-items: start;
  padding: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
  border-left: 6px solid transparent;
  transition: background-color 140ms linear, border-left-color 140ms linear;
}
.entry-row:hover {
  background-color: var(--color-surface-alt);
  border-left-color: var(--color-primary);
}

.entry-num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  padding-top: 4px;
}

.entry-body { min-width: 0; }

.entry-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  margin: 0;
}
.entry-name a { color: var(--color-ink); }
.entry-name a:hover { color: var(--color-primary); text-decoration: none; }

.entry-desc {
  margin: 6px 0 0;
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.entry-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  justify-content: flex-end;
}

/* ============ 11. 状态标签 ============ */
.tag {
  display: inline-block;
  padding: 4px 9px;
  background-color: var(--color-surface);
  color: var(--color-ink);
  border: var(--border-thin) solid var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  line-height: 1.4;
  white-space: nowrap;
}
.tag--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: var(--color-primary);
}
.tag--accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  border-color: var(--color-accent);
}
.tag--soft {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* ============ 12. 数字块与色块 ============ */
.number-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border: var(--border-thick) solid var(--color-ink);
  box-shadow: var(--shadow-2);
}
.number-block--accent { background-color: var(--color-accent); color: var(--color-accent-ink); }
.number-block--deep { background-color: var(--color-contrast-surface); color: var(--color-contrast-ink); }

.number-block-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
}
.number-block-value--figure { font-size: var(--text-figure); }

.number-block-label {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
}

.number-block-note {
  font-size: var(--text-xs);
  line-height: 1.6;
  opacity: 0.82;
}
.number-block--deep .number-block-value { color: var(--color-contrast-accent); }
.number-block--deep .number-block-note { color: color-mix(in srgb, var(--color-contrast-ink) 72%, var(--color-contrast-surface)); opacity: 1; }

.solid-block {
  padding: var(--space-4);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border: var(--border-thick) solid var(--color-ink);
  box-shadow: var(--shadow-2);
}

/* ============ 13. 折叠条带 ============ */
.accordion-strip {
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-ink);
}
.accordion-strip + .accordion-strip { border-top: 0; }

.accordion-strip > summary {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr) auto;
  gap: var(--space-2);
  align-items: center;
  padding: 14px var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  transition: background-color 140ms linear;
}
.accordion-strip > summary::-webkit-details-marker { display: none; }
.accordion-strip > summary::marker { content: ""; }
.accordion-strip > summary:hover { background-color: var(--color-primary-soft); }
.accordion-strip[open] > summary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.accordion-strip[open] > summary:hover { background-color: var(--color-primary); }

.strip-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}
.accordion-strip[open] .strip-num { color: var(--color-primary-ink); }

.strip-state {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}
.accordion-strip[open] .strip-state { color: var(--color-primary-ink); }

.strip-body {
  padding: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}
.strip-body p { margin: 0 0 var(--space-2); max-width: var(--measure); }
.strip-body p:last-child { margin-bottom: 0; }

/* ============ 14. 图片容器 ============ */
.media-frame {
  position: relative;
  overflow: hidden;
  background-color: var(--color-surface-deep);
  border: var(--border-thick) solid var(--color-ink);
  box-shadow: var(--shadow-2);
}

.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
  z-index: 1;
}

.media-frame--plain::after { background: none; }

.media-caption {
  position: relative;
  z-index: 2;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
}

.media-frame--overlay > .media-caption {
  position: absolute;
  inset: auto 0 0 0;
}

.media-caption-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}

.media-caption-note {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, var(--color-contrast-surface));
}

.media-frame--deep {
  background-color: var(--color-contrast-surface);
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: flex-end;
}

/* ============ 15. 响应式 ============ */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--6 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .header-inner { align-items: center; }

  .brand-link {
    border-right: 0;
    padding-right: var(--space-2);
  }

  .nav-toggle { display: flex; order: 2; }

  .site-nav {
    order: 3;
    flex: 0 0 100%;
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 280ms ease;
  }
  .site-nav[data-open] { max-height: 640px; }

  .nav-list {
    flex-direction: column;
    border-left: 0;
    border-top: var(--border-thin) solid var(--color-ink);
    width: 100%;
  }

  .nav-item { display: block; }

  .nav-link {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 14px;
    padding: 14px 4px;
    border-right: 0;
    border-bottom: var(--border-thin) solid var(--color-line);
  }
  .nav-link[aria-current="page"] {
    box-shadow: inset 6px 0 0 var(--color-ink);
    padding-left: 14px;
  }

  .nav-label { font-size: var(--text-base); }

  .header-pos { display: none; }

  .section { padding-block: var(--space-6); }
  .section--lg { padding-block: var(--space-8); }
  .footer-inner { padding-top: var(--space-6); }
}

@media (max-width: 680px) {
  .footer-grid { grid-template-columns: 1fr; }
  .grid--2,
  .grid--3,
  .grid--4,
  .grid--6 { grid-template-columns: 1fr; }

  .entry-row {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 12px;
  }
  .entry-meta {
    grid-column: 2 / -1;
    justify-content: flex-start;
  }

  .accordion-strip > summary {
    grid-template-columns: 48px minmax(0, 1fr);
  }
  .strip-state { grid-column: 2 / -1; }

  .brand-name { font-size: var(--text-base); }
  .footer-brand { font-size: var(--text-xl); }

  .number-block-value { font-size: var(--text-2xl); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* ============ 16. 显现动画 ============ */
.reveal-ready {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 340ms ease, transform 340ms ease;
}
.reveal-ready.is-revealed {
  opacity: 1;
  transform: none;
}

/* ============ 17. 无障碍偏好 ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

  .reveal-ready {
    opacity: 1;
    transform: none;
    transition: none;
  }
}