:root {
  --color-surface: #f8f7f7;
  --color-surface-alt: #efeeee;
  --color-surface-deep: #e3e2e1;
  --color-ink: #4c463e;
  --color-ink-soft: #726a5f;
  --color-ink-muted: #8a8175;
  --color-line: #d9d7d6;
  --color-primary: #8f7247;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e9e4de;
  --color-accent: #5452ad;
  --color-accent-ink: #ffffff;
  --color-highlight: #dad9ea;
  --color-focus: #4746b9;
  --color-contrast-surface: #231f19;
  --color-contrast-ink: #e7e6e4;
  --color-contrast-line: #4e4b46;
  --color-contrast-accent: #8483c4;
  --overlay-scrim: linear-gradient(180deg, rgba(35, 31, 25, 0.35) 0%, rgba(35, 31, 25, 0.72) 55%, rgba(35, 31, 25, 0.92) 100%);
  --font-heading: "Songti SC", "Source Han Serif SC", "Noto Serif SC", SimSun, serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 11.0px;
  --text-sm: 14.7px;
  --text-base: 17px;
  --text-lg: 22.7px;
  --text-xl: 30.2px;
  --text-2xl: 40.3px;
  --text-3xl: 53.7px;
  --text-4xl: 71.5px;
  --text-display: clamp(34px, 7.0vw, 89px);
  --text-figure: clamp(28px, 5.0vw, 64px);
  --weight-heading: 713;
  --weight-body: 400;
  --leading-body: 1.75;
  --leading-heading: 1.2;
  --tracking-heading: -0.007em;
  --radius-sm: 2px;
  --radius-md: 2px;
  --radius-lg: 3px;
  --radius-pill: 3px;
  --border-thin: 2px;
  --border-thick: 3px;
  --shadow-1: 0 1px 0 rgba(76, 70, 62, 0.12);
  --shadow-2: 0 2px 0 rgba(76, 70, 62, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1100px;
  --measure: 67ch;
  --gutter: 32px;
  --section-y: 82px;
  --section-y-lg: 115px;
}

/* 派生色：全部由上方定稿变量计算，不新增定稿同名变量 */
:root {
  --hair: color-mix(in srgb, var(--color-ink) 28%, var(--color-surface) 72%);
  --masthead-soft: color-mix(in srgb, var(--color-primary-ink) 74%, var(--color-primary) 26%);
  --panel-tint: color-mix(in srgb, var(--color-contrast-ink) 7%, var(--color-contrast-surface) 93%);
  --foot-text: color-mix(in srgb, var(--color-contrast-ink) 82%, var(--color-contrast-surface) 18%);
  --deep-hover: color-mix(in srgb, var(--color-primary) 84%, var(--color-contrast-surface) 16%);
  --accent-hover: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface) 16%);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 150px;
}

body {
  margin: 0;
  background: 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);
  word-break: break-word;
}

h1, h2, h3, h4, h5 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: inherit;
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

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

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

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

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

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

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

hr { border: 0; }

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

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

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ============ 2. 排版工具 ============ */
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.display-statement {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.figure-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

.lede {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

.eyebrow {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  color: var(--color-primary);
}

.prose { max-width: var(--measure); }
.prose p { margin-bottom: var(--space-3); text-align: justify; text-justify: inter-ideograph; }
.prose h2 { margin-top: var(--space-6); }
.prose h3 { margin-top: var(--space-4); }
.prose ul { margin: 0 0 var(--space-3); }
.prose li { position: relative; padding-left: var(--space-3); margin-bottom: var(--space-1); }
.prose li::before { content: "—"; position: absolute; left: 0; color: var(--color-primary); }

/* ============ 3. 容器、分区与栅格 ============ */
.shell {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.section { padding: var(--section-y) 0; }
.section--lg { padding: var(--section-y-lg) 0; }
.section--alt { background: var(--color-surface-alt); border-top: var(--border-thick) solid var(--color-contrast-surface); }
.section--deep { background: var(--color-surface-deep); }

.section--contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thick) solid var(--color-primary);
  border-bottom: var(--border-thick) solid var(--color-primary);
}
.section--contrast h1,
.section--contrast h2,
.section--contrast h3,
.section--contrast h4 { color: var(--color-contrast-ink); }
.section--contrast .lede,
.section--contrast .section__note { color: var(--color-contrast-accent); }
.section--contrast .section__index { color: var(--color-contrast-accent); }
.section--contrast a:hover { color: var(--color-contrast-accent); }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.section__index {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.26em;
  color: var(--color-primary);
}
.section__title { margin: 0; font-size: var(--text-2xl); }
.section__note { margin: 0; max-width: 52ch; font-size: var(--text-sm); color: var(--color-ink-soft); }

.grid { display: grid; gap: var(--space-4); }
.grid--12 { grid-template-columns: repeat(12, 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)); }

.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

/* ============ 4. 刊头与导航 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--color-surface);
  border-bottom: var(--border-thick) solid var(--color-contrast-surface);
}

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -80px;
  z-index: 130;
  padding: 10px 16px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  border-radius: var(--radius-sm);
  transition: top 0.18s ease-out;
}
.skip-link:focus { top: var(--space-2); color: var(--color-contrast-ink); }

.topbar {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thick) solid var(--color-contrast-line);
}
.topbar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-top: var(--space-1);
  padding-bottom: var(--space-1);
}
.topbar__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-contrast-accent);
}
.topbar__tools { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3); }

.switcher { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.switcher__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-contrast-accent);
}

.chip {
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-contrast-ink);
  background: transparent;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  transition: background-color 0.18s ease-out, color 0.18s ease-out, border-color 0.18s ease-out;
}
.chip:hover { border-color: var(--color-contrast-accent); color: var(--color-contrast-ink); }
.chip[aria-pressed="true"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.chip--light { color: var(--color-ink); border-color: var(--hair); }
.chip--light:hover { border-color: var(--color-contrast-surface); color: var(--color-ink); }
.chip--light[aria-pressed="true"] {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.masthead {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-bottom: var(--border-thick) solid var(--color-contrast-surface);
}
.masthead__inner {
  padding-top: var(--space-4);
  padding-bottom: var(--space-3);
  text-align: center;
  transition: padding 0.2s ease-out;
}
.masthead__brand { display: inline-block; color: var(--color-primary-ink); }
.masthead__brand:hover { color: var(--color-primary-ink); }
.masthead__name {
  display: block;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: 1.04;
  letter-spacing: 0.02em;
  transition: font-size 0.2s ease-out;
}
.masthead__tagline {
  display: block;
  margin-top: 6px;
  font-size: var(--text-xs);
  letter-spacing: 0.34em;
  color: var(--masthead-soft);
}
.masthead__scale {
  display: block;
  height: 8px;
  max-width: 520px;
  margin: var(--space-2) auto 0;
  background-image: repeating-linear-gradient(90deg, currentColor 0 2px, transparent 2px 18px);
  opacity: 0.5;
}

.site-header[data-condensed] .masthead__inner {
  padding-top: var(--space-1);
  padding-bottom: var(--space-1);
}
.site-header[data-condensed] .masthead__name { font-size: var(--text-lg); }
.site-header[data-condensed] .masthead__scale { display: none; }

.navband { background: var(--color-surface); }
.navband__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  position: relative;
}
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-ink);
  border: var(--border-thin) solid var(--color-contrast-surface);
  border-radius: var(--radius-sm);
}
.nav-toggle__text { display: inline-block; letter-spacing: 0.14em; }
.nav-toggle__bars { position: relative; display: block; width: 16px; height: 2px; background: currentColor; }
.nav-toggle__bars::before,
.nav-toggle__bars::after { content: ""; position: absolute; left: 0; width: 16px; height: 2px; background: currentColor; }
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.main-nav { flex: 1 1 auto; display: flex; justify-content: center; }
.main-nav__list { display: flex; flex-wrap: wrap; align-items: stretch; justify-content: center; }
.main-nav__item { display: flex; }
.main-nav__link {
  display: flex;
  align-items: center;
  padding: 14px var(--space-3);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.02em;
  border-bottom: var(--border-thick) solid transparent;
  transition: background-color 0.18s ease-out, color 0.18s ease-out, border-color 0.18s ease-out;
}
.main-nav__link:hover { background: var(--color-surface-alt); color: var(--color-ink); }
.main-nav__link[aria-current="page"] {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom-color: var(--color-primary);
}

/* ============ 5. 页脚 ============ */
.site-footer {
  margin-top: var(--section-y);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thick) solid var(--color-primary);
}
.footer-brand {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-6) 0 var(--space-4);
  border-bottom: var(--border-thick) solid var(--color-contrast-line);
}
.footer-brand__name {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  letter-spacing: 0.02em;
}
.footer-brand__line {
  margin: 0;
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-contrast-accent);
}
.footer-brand__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-contrast-accent);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-3);
  padding-top: var(--space-4);
}
.footer-panel {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--panel-tint);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-lg);
}
.footer-panel--intro { grid-column: span 5; }
.footer-panel--contact { grid-column: span 7; }
.footer-panel--notice { grid-column: span 7; }
.footer-panel--rhythm { grid-column: span 5; }

.footer-panel--contact {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.footer-panel__index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  color: var(--color-contrast-accent);
}
.footer-panel--contact .footer-panel__index { color: var(--color-primary-ink); opacity: 0.72; }

.footer-panel__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
}
.footer-panel__text {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--foot-text);
}
.footer-panel--contact .footer-panel__text { color: var(--color-primary-ink); }

.footer-list { display: flex; flex-direction: column; gap: 6px; font-size: var(--text-sm); }
.footer-list__item { display: flex; align-items: baseline; gap: var(--space-2); }
.footer-list__key {
  min-width: 44px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-contrast-accent);
}
.footer-panel--contact .footer-list__key { color: var(--color-primary-ink); opacity: 0.75; }

.footer-link {
  color: inherit;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  transition: color 0.18s ease-out;
}
.footer-link:hover { color: var(--color-contrast-accent); }
.footer-panel--contact .footer-link:hover { color: var(--color-primary-ink); }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding: var(--space-4) 0 var(--space-6);
  border-top: var(--border-thick) solid var(--color-contrast-line);
}
.footer-base__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-contrast-accent);
}
.footer-nav__list { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.footer-nav__item { display: flex; }
.footer-nav__link {
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-ink);
  border-bottom: 1px solid var(--color-contrast-line);
  padding-bottom: 2px;
}
.footer-nav__link:hover { color: var(--color-contrast-accent); border-bottom-color: var(--color-primary); }

/* ============ 6. 通用组件 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 11px 20px;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-md);
  transition: background-color 0.18s ease-out, color 0.18s ease-out, border-color 0.18s ease-out;
}
.btn--primary { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background: var(--deep-hover); color: var(--color-primary-ink); }
.btn--accent { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }
.btn--accent:hover { background: var(--accent-hover); color: var(--color-accent-ink); }
.btn--outline { border-color: var(--color-contrast-surface); color: var(--color-ink); }
.btn--outline:hover { background: var(--color-contrast-surface); color: var(--color-contrast-ink); }
.btn--outline-light { border-color: var(--color-contrast-ink); color: var(--color-contrast-ink); }
.btn--outline-light:hover { background: var(--color-contrast-ink); color: var(--color-contrast-surface); }

.tag {
  display: inline-block;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-soft);
  border: var(--border-thin) solid currentColor;
  border-radius: var(--radius-pill);
}
.tag--primary { color: var(--color-primary); }
.tag--accent { color: var(--color-accent); }
.tag--contrast { color: var(--color-contrast-ink); }

.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-contrast-surface);
  border-radius: var(--radius-md);
}
.card--alt { background: var(--color-surface-alt); }
.card--deep { background: var(--color-surface-deep); }
.card--primary { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-primary-ink); }
.card--accent { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }
.card--contrast { background: var(--color-contrast-surface); border-color: var(--color-contrast-surface); color: var(--color-contrast-ink); }

.card__tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}
.card__title { margin: 0; font-size: var(--text-lg); }
.card__text { margin: 0; font-size: var(--text-sm); color: var(--color-ink-soft); }

.card--primary .card__tag,
.card--accent .card__tag,
.card--contrast .card__tag { color: inherit; opacity: 0.75; }
.card--primary .card__text,
.card--accent .card__text,
.card--contrast .card__text { color: inherit; opacity: 0.88; }

.data-table { width: 100%; font-size: var(--text-sm); }
.data-table caption {
  caption-side: top;
  padding-bottom: var(--space-2);
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}
.data-table th {
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.12em;
  text-align: left;
  color: var(--color-ink-soft);
  border-bottom: var(--border-thick) solid var(--color-contrast-surface);
}
.data-table td {
  padding: 12px;
  vertical-align: top;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.data-table .num { text-align: right; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.data-table tbody tr:nth-child(even) { background: var(--color-surface-deep); }
.data-table tbody tr[data-state="hit"] { background: var(--color-highlight); }

.panel {
  margin-bottom: var(--space-2);
  overflow: hidden;
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-contrast-surface);
  border-radius: var(--radius-md);
}
.panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  background: var(--color-surface-deep);
  transition: background-color 0.18s ease-out;
}
.panel__head:hover { background: color-mix(in srgb, var(--color-surface-deep) 72%, var(--color-primary-soft) 28%); }
.panel__arrow { display: inline-block; font-family: var(--font-mono); transition: transform 0.2s ease-out; }
.panel__head[aria-expanded="true"] .panel__arrow { transform: rotate(90deg); }
.panel__body { display: none; padding: var(--space-4); }
.panel__body[data-open] { display: block; }

.figure-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-contrast-surface);
  border-radius: var(--radius-sm);
}
.figure-frame__media {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.figure-frame--tall .figure-frame__media { aspect-ratio: 4 / 5; }
.figure-frame--wide .figure-frame__media { aspect-ratio: 21 / 9; }
.figure-frame__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}
.figure-frame__label {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  padding: 6px 10px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  border-right: var(--border-thick) solid var(--color-primary);
  border-bottom: var(--border-thick) solid var(--color-primary);
}
.figure-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  margin: 0;
  padding: var(--space-4);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.6;
}
.figure-frame__caption span {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-accent);
}

.data-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  border-left: var(--border-thick) solid var(--color-contrast-line);
}
.data-strip__item {
  padding: var(--space-4) var(--space-3);
  border-right: var(--border-thick) solid var(--color-contrast-line);
  border-bottom: var(--border-thick) solid var(--color-contrast-line);
}
.data-strip__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-contrast-accent);
}
.data-strip__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  line-height: 1.05;
  color: var(--color-contrast-ink);
  font-variant-numeric: tabular-nums;
}
.data-strip__unit { margin-left: 4px; font-size: var(--text-sm); color: var(--color-contrast-accent); }

.breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}
.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumb__item { display: flex; align-items: center; gap: 8px; }
.breadcrumb__item:not(:first-child)::before { content: "/"; color: var(--hair); }
.breadcrumb__link:hover { color: var(--color-primary); }
.breadcrumb__current { color: var(--color-ink); }

.rule-scale {
  display: block;
  height: var(--border-thick);
  margin: var(--space-4) 0;
  background-image: repeating-linear-gradient(90deg, var(--color-contrast-surface) 0 14px, transparent 14px 24px);
}
.rule-scale--light {
  background-image: repeating-linear-gradient(90deg, var(--color-contrast-ink) 0 14px, transparent 14px 24px);
  opacity: 0.5;
}

.float-index {
  position: fixed;
  top: 50%;
  right: var(--space-3);
  z-index: 70;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 6px;
  transform: translateY(-50%);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-contrast-surface);
  border-radius: var(--radius-md);
}
.float-index__link {
  padding: 7px 9px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}
.float-index__link:hover { background: var(--color-surface-alt); color: var(--color-ink); }
.float-index__link[aria-current="true"] { background: var(--color-contrast-surface); color: var(--color-contrast-ink); }

/* ============ 7. 筛选与显现 ============ */
[data-filter-item] { transition: opacity 0.24s ease-out; }
[data-filter-item][data-state="miss"] { opacity: 0.4; }
.is-folded { display: none; }

html[data-reveal="on"] .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.24s ease-out, transform 0.24s ease-out;
}
html[data-reveal="on"] .reveal.is-in { opacity: 1; transform: none; }

/* ============ 8. 响应式 ============ */
@media (max-width: 1200px) {
  .float-index { display: none; }
}

@media (max-width: 1000px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .col-3, .col-4, .col-5 { grid-column: span 6; }
  .col-7, .col-8, .col-9 { grid-column: span 12; }
  .footer-panel--intro,
  .footer-panel--contact,
  .footer-panel--notice,
  .footer-panel--rhythm { grid-column: span 6; }
  .footer-brand { gap: var(--space-2); }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 170px; }
  .section { padding: var(--space-6) 0; }
  .section--lg { padding: var(--space-6) 0; }
  .site-footer { margin-top: var(--space-6); }

  .topbar__inner { justify-content: flex-start; }
  .topbar__meta { width: 100%; }

  .navband__inner {
    justify-content: flex-start;
    padding-top: var(--space-1);
    padding-bottom: var(--space-1);
  }
  .nav-toggle { display: inline-flex; }
  .main-nav {
    display: none;
    width: 100%;
    margin-top: var(--space-1);
    border-top: var(--border-thick) solid var(--color-contrast-line);
  }
  .main-nav[data-open] { display: block; }
  .main-nav__list { flex-direction: column; align-items: stretch; }
  .main-nav__item { width: 100%; }
  .main-nav__link {
    justify-content: space-between;
    padding: 13px 4px;
    border-bottom: var(--border-thin) solid var(--color-line);
  }
  .main-nav__link[aria-current="page"] {
    padding-left: 12px;
    padding-right: 12px;
    border-bottom-color: var(--color-primary);
  }
}

@media (max-width: 640px) {
  .shell { padding-left: var(--space-2); padding-right: var(--space-2); }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9 { grid-column: span 12; }
  .footer-panel--intro,
  .footer-panel--contact,
  .footer-panel--notice,
  .footer-panel--rhythm { grid-column: span 12; }
  .masthead__name { font-size: var(--text-xl); }
  .masthead__tagline { letter-spacing: 0.2em; }
  .topbar__tools { gap: var(--space-1); }
  .switcher__label { display: none; }
  .data-strip__value { font-size: var(--text-xl); }
  .figure-frame__caption { padding: var(--space-3); }
  .footer-brand { padding-top: var(--space-4); }
}

/* ============ 9. 减弱动效 ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
  html[data-reveal="on"] .reveal { opacity: 1; transform: none; }
}