:root {
  --color-surface: #fafafa;
  --color-surface-alt: #f1f1f1;
  --color-surface-deep: #e4e5e4;
  --color-ink: #434940;
  --color-ink-soft: #697165;
  --color-ink-muted: #7d857a;
  --color-line: #d9dad9;
  --color-primary: #687c60;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e6e8e4;
  --color-accent: #3a8717;
  --color-accent-ink: #ffffff;
  --color-highlight: #d7e5d1;
  --color-focus: #32810d;
  --color-contrast-surface: #121311;
  --color-contrast-ink: #e5e7e4;
  --color-contrast-line: #40423f;
  --color-contrast-accent: #5dda25;
  --overlay-scrim: linear-gradient(180deg, rgba(18, 19, 17, 0.35) 0%, rgba(18, 19, 17, 0.72) 55%, rgba(18, 19, 17, 0.92) 100%);
  --font-heading: STZhongsong, "Source Han Serif SC", "Songti SC", SimSun, serif;
  --font-body: "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 9.3px;
  --text-sm: 13.9px;
  --text-base: 17px;
  --text-lg: 25.5px;
  --text-xl: 38.2px;
  --text-2xl: 57.4px;
  --text-3xl: 86.1px;
  --text-4xl: 129.1px;
  --text-display: clamp(44px, 9.0vw, 115px);
  --text-figure: clamp(37px, 6.5vw, 83px);
  --weight-heading: 465;
  --weight-body: 400;
  --leading-body: 1.78;
  --leading-heading: 1.24;
  --tracking-heading: -0.001em;
  --radius-sm: 0px;
  --radius-md: 0px;
  --radius-lg: 0px;
  --radius-pill: 0px;
  --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: 66ch;
  --gutter: 24px;
  --section-y: 127px;
  --section-y-lg: 178px;
}

/* ============================================================
   828娱乐会 · 共享样式 /assets/site.css
   设计定稿：单色排版建筑 + 深夜数据工作室的收口对比
   ============================================================ */

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  font-weight: var(--weight-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg, video { display: block; max-width: 100%; }
h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; }
[hidden] { display: none !important; }

a {
  color: var(--color-accent);
  text-decoration: none;
  text-underline-offset: 0.18em;
}
a:hover { text-decoration: underline; text-decoration-thickness: 1px; }

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

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

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

main [id] { scroll-margin-top: 132px; }

/* ---------- 布局基础 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--space-8); }
.section--lg { padding-block: var(--section-y); }
.section--xl { padding-block: var(--section-y-lg); }
.section--alt { background: var(--color-surface-alt); }

.grid { display: grid; gap: var(--gutter); }
.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-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }

/* ---------- 文字层级 ---------- */
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.display {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 0.95;
  letter-spacing: -0.01em;
}

.figure {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 0.95;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.title-xl { font-size: var(--text-2xl); line-height: 1.04; }
.title-lg { font-size: var(--text-xl); line-height: 1.1; }
.title-md { font-size: var(--text-lg); line-height: 1.2; }
.title-sm { font-size: var(--text-base); letter-spacing: 0.08em; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.22em;
  color: var(--color-ink-muted);
}

.link-accent { color: var(--color-accent); }

.highlight {
  background: var(--color-highlight);
  color: var(--color-ink);
  padding: 0 0.18em;
}

.prose { max-width: var(--measure); }
.prose > * + * { margin-top: var(--space-3); }
.prose h2 { font-size: var(--text-lg); margin-top: var(--space-6); }
.prose h3 {
  font-size: var(--text-base);
  letter-spacing: 0.08em;
  margin-top: var(--space-4);
}
.prose ul { list-style: disc; padding-left: 1.3em; }
.prose ol { list-style: decimal; padding-left: 1.4em; }
.prose li + li { margin-top: var(--space-1); }
.prose strong { font-weight: 600; }

.band {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.band a { color: var(--color-contrast-accent); }
.band .eyebrow { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }

.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;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-height: 44px;
  padding: 12px 22px;
  border: 0;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  text-decoration: none;
  cursor: pointer;
}
.btn:hover,
.btn:focus-visible {
  background: color-mix(in srgb, var(--color-primary) 82%, var(--color-contrast-surface));
  color: var(--color-primary-ink);
  text-decoration: none;
}
.btn--accent { background: var(--color-accent); }
.btn--accent:hover,
.btn--accent:focus-visible { background: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface)); }
.btn--ghost { background: var(--color-surface-deep); color: var(--color-ink); }
.btn--ghost:hover,
.btn--ghost:focus-visible { background: var(--color-primary-soft); color: var(--color-ink); }
.btn--quiet {
  background: transparent;
  color: var(--color-accent);
  padding-inline: 0;
}
.btn--quiet:hover,
.btn--quiet:focus-visible { background: transparent; color: var(--color-accent); text-decoration: underline; }

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55em;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.breadcrumb a { color: var(--color-ink-soft); }
.breadcrumb__sep { font-family: var(--font-mono); color: var(--color-ink-muted); }

/* ---------- 图片容器（页面阶段放置图片） ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--color-surface-deep);
}
.media img,
.media video { width: 100%; height: 100%; object-fit: cover; }
.media--wide { aspect-ratio: 16 / 10; }
.media--panorama { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }
.media--bleed { margin-inline: calc(var(--gutter) * -1); }
.media__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}
.media__caption {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-contrast-ink);
}

/* ---------- 筛选 ---------- */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
}
.filter {
  min-height: 44px;
  padding: 10px 0;
  border: 0;
  background: none;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  letter-spacing: 0.16em;
  color: var(--color-ink-soft);
  cursor: pointer;
}
.filter:hover { color: var(--color-accent); }
.filter[aria-pressed="true"] {
  color: var(--color-accent);
  font-weight: var(--weight-heading);
  text-decoration: underline;
  text-underline-offset: 0.4em;
  text-decoration-thickness: 1px;
}

/* ---------- 折叠面板 ---------- */
.panel + .panel { margin-top: var(--space-2); }
.panel__summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 44px;
  padding-block: var(--space-2);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}
.panel__summary::-webkit-details-marker { display: none; }
.panel__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-accent);
}
.panel[open] .panel__summary { color: var(--color-accent); }
.panel[open] .panel__summary::after { content: "–"; }
.panel__body {
  padding: var(--space-3);
  background: var(--color-primary-soft);
}
.panel__body > * + * { margin-top: var(--space-2); }

/* ---------- 表格 ---------- */
.table-wrap {
  overflow-x: auto;
  margin-inline: calc(var(--gutter) * -1);
  padding-inline: var(--gutter);
}
.table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.table caption {
  padding-bottom: var(--space-1);
  text-align: left;
  color: var(--color-ink-soft);
}
.table th {
  background: var(--color-surface-deep);
  padding: 12px var(--space-2);
  font-family: var(--font-mono);
  font-weight: var(--weight-body);
  letter-spacing: 0.08em;
  text-align: left;
  white-space: nowrap;
  color: var(--color-ink-soft);
}
.table td {
  padding: 12px var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  color: var(--color-ink);
}
.table tbody tr:nth-child(even) td { background: var(--color-primary-soft); }

/* ---------- 时间线 ---------- */
.timeline { display: grid; gap: var(--space-6); }
.timeline__item { position: relative; padding-left: var(--space-4); }
.timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 12px;
  height: var(--border-thin);
  background: var(--color-ink-muted);
}
.timeline__mark {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}
.timeline__title { margin-top: 4px; font-size: var(--text-lg); }
.timeline__body {
  margin-top: var(--space-1);
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

/* ---------- 数字组 ---------- */
.stat { display: block; }
.stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 0.95;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}
.stat__label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-ink-soft);
}

/* ---------- 悬浮章节索引 ---------- */
.index {
  position: sticky;
  top: 132px;
  font-size: var(--text-sm);
}
.index__list { display: grid; gap: 2px; }
.index__link {
  display: block;
  padding: 8px 0;
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  text-decoration: none;
}
.index__link:hover { color: var(--color-accent); text-decoration: none; }
.index__link[aria-current="true"] { color: var(--color-accent); }

/* ---------- 滚动淡入（无位移） ---------- */
[data-reveal] {
  opacity: 0;
  transition: opacity 0.2s linear;
}
[data-reveal].is-visible { opacity: 1; }

/* ============================================================
   共享头部
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 70;
  background: var(--color-surface);
}

.site-header.is-scrolled {
  background: color-mix(in srgb, var(--color-surface) 88%, transparent);
  backdrop-filter: blur(14px) saturate(118%);
  -webkit-backdrop-filter: blur(14px) saturate(118%);
}

.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -72px;
  z-index: 90;
  padding: 12px 18px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  transition: top 0.18s ease;
}
.skip-link:focus,
.skip-link:focus-visible {
  top: var(--space-2);
  color: var(--color-contrast-accent);
  text-decoration: none;
  outline-color: var(--color-contrast-accent);
}

.header__inner {
  position: relative;
  padding-block: var(--space-3) var(--space-1);
}

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-3);
}

.masthead__aside {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.masthead__core {
  justify-self: center;
  text-align: center;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.26em;
  color: var(--color-ink);
  text-decoration: none;
}
.brand:hover,
.brand:focus-visible { color: var(--color-primary); text-decoration: none; }
.brand__num {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  letter-spacing: 0.04em;
  color: var(--color-primary);
}
.brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1;
  letter-spacing: 0.3em;
  margin-right: -0.3em;
}
.masthead__claim {
  margin-top: 6px;
  font-size: var(--text-sm);
  letter-spacing: 0.2em;
  color: var(--color-ink-soft);
}

.masthead__tools {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.tool {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 0 4px;
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-ink-soft);
  text-decoration: none;
}
.tool:hover,
.tool:focus-visible { color: var(--color-accent); text-decoration: none; }
.tool--search {
  padding: 0 14px;
  background: var(--color-surface-deep);
  color: var(--color-ink);
}
.tool__sigil { color: var(--color-accent); }
.tool--key { color: var(--color-accent); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0;
  border: 0;
  background: none;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  cursor: pointer;
}
.nav-toggle__label { letter-spacing: 0.14em; }
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 10px;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: var(--border-thin);
  background: currentColor;
  transition: transform 0.18s ease, top 0.18s ease;
}
.nav-toggle__bars::before { top: 1px; }
.nav-toggle__bars::after { top: 8px; }
.nav-toggle[aria-expanded="true"] { color: var(--color-accent); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 5px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 5px; transform: rotate(-45deg); }

.site-nav { margin-top: var(--space-1); }
.site-nav__list {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.site-nav__list::-webkit-scrollbar { display: none; }
.site-nav__item { flex: 0 0 auto; }
.site-nav__link {
  display: inline-block;
  min-height: 44px;
  padding-block: 12px;
  font-size: var(--text-sm);
  letter-spacing: 0.18em;
  color: var(--color-ink-soft);
  text-decoration: none;
  white-space: nowrap;
}
.site-nav__link:hover,
.site-nav__link:focus-visible { color: var(--color-accent); text-decoration: none; }
.site-nav__link[aria-current="page"] {
  color: var(--color-accent);
  font-weight: var(--weight-heading);
}

/* ============================================================
   共享页脚：全站唯一使用细线与刻度的区域
   ============================================================ */
.site-footer {
  margin-top: var(--space-8);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.site-footer a { color: var(--color-contrast-ink); }
.site-footer :focus-visible { outline-color: var(--color-contrast-accent); }

.footer__inner { padding-block: var(--space-8) var(--space-6); }

.footer__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
}
.footer__claim {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  letter-spacing: 0.06em;
  color: var(--color-contrast-ink);
}
.footer__meta {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.footer__rule {
  height: 12px;
  margin-block: var(--space-4);
  background-image:
    repeating-linear-gradient(to right, var(--color-contrast-line) 0 1px, transparent 1px 10px),
    linear-gradient(to right, var(--color-contrast-line), var(--color-contrast-line));
  background-size: 100% 12px, 100% var(--border-thin);
  background-position: top left, bottom left;
  background-repeat: repeat-x, no-repeat;
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4);
}
.footer__col { min-width: 0; }
.footer__col-title {
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-body);
  letter-spacing: 0.22em;
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}
.footer__links { display: grid; gap: 8px; }
.footer__link {
  display: inline-block;
  padding-block: 4px;
  font-size: var(--text-base);
  color: var(--color-contrast-ink);
  text-decoration: none;
}
.footer__link:hover,
.footer__link:focus-visible { color: var(--color-contrast-accent); text-decoration: none; }
.footer__hint {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-contrast-ink) 55%, transparent);
}

.footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
}
.footer__contact {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-4);
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
}
.footer__contact-item { color: inherit; }
.footer__note {
  max-width: var(--measure);
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 960px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .col-4, .col-6, .col-8 { grid-column: 1 / -1; }
  .index { position: static; top: auto; }
}

@media (max-width: 860px) {
  .masthead { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .masthead__aside { display: none; }
  .masthead__core { justify-self: center; padding-top: var(--space-1); }
  .brand__num,
  .brand__name { font-size: var(--text-base); }
  .brand__name { letter-spacing: 0.24em; margin-right: -0.24em; }

  .nav-toggle {
    display: inline-flex;
    position: absolute;
    right: var(--gutter);
    top: calc(var(--space-3) + 4px);
  }

  .masthead__tools {
    display: none;
    justify-self: stretch;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-top: var(--space-2);
  }
  .masthead__tools[data-open] { display: flex; }
  .tool { justify-content: space-between; padding: 10px 14px; }
  .tool--search { background: var(--color-surface-deep); }

  .site-nav { margin-top: var(--space-2); }
  .site-nav__list { justify-content: flex-start; gap: var(--space-3); }

  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__base { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 640px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .title-xl { font-size: var(--text-xl); }
  .title-lg { font-size: var(--text-lg); }
  .section--lg { padding-block: var(--space-8); }
  .section--xl { padding-block: var(--section-y); }
}

@media (max-width: 520px) {
  .footer__grid { grid-template-columns: minmax(0, 1fr); }
}

@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;
  }
  [data-reveal] { opacity: 1; transition: none; }
}