:root {
  --color-surface: #211f22;
  --color-surface-alt: #2f2d31;
  --color-surface-deep: #413e43;
  --color-ink: #c1b9c5;
  --color-ink-soft: #94889b;
  --color-ink-muted: #837689;
  --color-line: #3e3b3f;
  --color-primary: #9a4dc1;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #322538;
  --color-accent: #a3d728;
  --color-accent-ink: #161118;
  --color-highlight: #384023;
  --color-focus: #a8e41b;
  --color-contrast-surface: #efeeef;
  --color-contrast-ink: #343036;
  --color-contrast-line: #c6c4c6;
  --color-contrast-accent: #587415;
  --overlay-scrim: linear-gradient(180deg, rgba(239, 238, 239, 0.35) 0%, rgba(239, 238, 239, 0.72) 55%, rgba(239, 238, 239, 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: 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(52px, 10.7vw, 137px);
  --text-figure: clamp(44px, 7.7vw, 99px);
  --weight-heading: 608;
  --weight-body: 400;
  --leading-body: 1.75;
  --leading-heading: 1.17;
  --tracking-heading: 0.001em;
  --radius-sm: 7px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(193, 185, 197, 0.08);
  --shadow-2: 0 18px 44px rgba(193, 185, 197, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1120px;
  --measure: 66ch;
  --gutter: 32px;
  --section-y: 111px;
  --section-y-lg: 155px;
}

/* =========================================================
   主导航（透明叠加 → 实色阅读态）
   ========================================================= */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background-color:transparent;
  border-bottom:var(--border-thin) solid transparent;
  transition:background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}
.site-header::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:1px;
  background:linear-gradient(90deg,
    color-mix(in srgb, var(--color-primary) 70%, transparent),
    color-mix(in srgb, var(--color-accent) 70%, transparent),
    transparent 88%);
  opacity:0;
  transition:opacity 160ms ease;
  pointer-events:none;
}
.site-header[data-scrolled="true"],
.site-header[data-nav-open="true"]{
  background-color:color-mix(in srgb, var(--color-surface) 94%, transparent);
  border-bottom-color:var(--color-line);
  box-shadow:var(--shadow-1);
  backdrop-filter:saturate(140%) blur(12px);
}
.site-header[data-scrolled="true"]::after,
.site-header[data-nav-open="true"]::after{opacity:1;}

.header-inner{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding:var(--space-2) var(--gutter);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:var(--space-3);
  min-height:84px;
}

.brand{
  display:flex;
  align-items:center;
  gap:var(--space-2);
  color:color-mix(in srgb, var(--color-ink) 84%, var(--color-primary-ink));
  text-decoration:none;
  min-width:0;
}
.brand:hover{color:color-mix(in srgb, var(--color-ink) 92%, var(--color-primary-ink));}
.brand-mark{
  flex:none;
  width:28px;
  height:28px;
  border:var(--border-thin) solid var(--color-line);
  border-radius:var(--radius-sm);
  background:
    linear-gradient(140deg,
      color-mix(in srgb, var(--color-primary) 72%, transparent) 0%,
      color-mix(in srgb, var(--color-surface-deep) 80%, transparent) 52%,
      color-mix(in srgb, var(--color-accent) 58%, transparent) 100%);
  box-shadow:var(--shadow-1);
}
.brand-text{display:flex;flex-direction:column;min-width:0;}
.brand-name{
  font-family:var(--font-heading);
  font-weight:var(--weight-heading);
  font-size:var(--text-lg);
  line-height:1.1;
  letter-spacing:.06em;
}
.brand-tagline{
  font-family:var(--font-mono);
  font-size:var(--text-xs);
  letter-spacing:.12em;
  color:var(--color-ink-muted);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:var(--space-1);
  padding:10px 16px;
  border:var(--border-thin) solid var(--color-line);
  border-radius:var(--radius-pill);
  background-color:color-mix(in srgb, var(--color-surface-deep) 60%, transparent);
  color:var(--color-ink);
  font-size:var(--text-sm);
  letter-spacing:.1em;
  cursor:pointer;
}
.nav-toggle-bar{
  width:16px;
  height:1px;
  background-color:var(--color-accent);
  box-shadow:0 5px 0 var(--color-accent), 0 -5px 0 var(--color-accent);
}
.nav-toggle[aria-expanded="true"]{
  border-color:color-mix(in srgb, var(--color-primary) 60%, var(--color-line));
  background-color:var(--color-primary-soft);
}

.site-nav{
  display:flex;
  align-items:center;
  gap:var(--space-4);
}
.nav-list{
  display:flex;
  align-items:center;
  gap:var(--space-3);
  list-style:none;
  margin:0;
  padding:0;
}
.nav-list a{
  position:relative;
  display:inline-block;
  padding:var(--space-1) 2px;
  color:var(--color-ink-soft);
  font-size:var(--text-sm);
  letter-spacing:.08em;
  text-decoration:none;
  transition:color 160ms ease;
}
.nav-list a::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:1px;
  background:linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform 160ms ease;
}
.nav-list a:hover{color:var(--color-ink);}
.nav-list a:hover::after{transform:scaleX(1);}
.nav-list a[aria-current="page"]{color:var(--color-primary-ink);}
.nav-list a[aria-current="page"]::after{transform:scaleX(1);}

.nav-cta{
  display:inline-flex;
  align-items:center;
  padding:10px 20px;
  border:var(--border-thin) solid color-mix(in srgb, var(--color-primary) 58%, var(--color-line));
  border-radius:var(--radius-pill);
  background-color:color-mix(in srgb, var(--color-primary) 16%, transparent);
  color:color-mix(in srgb, var(--color-ink) 88%, var(--color-primary-ink));
  font-size:var(--text-sm);
  letter-spacing:.1em;
  text-decoration:none;
  transition:background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}
.nav-cta:hover{
  background-color:var(--color-primary);
  border-color:var(--color-primary);
  color:var(--color-primary-ink);
}

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  background:linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform:scaleX(0);
  transform-origin:left center;
  pointer-events:none;
}

.skip-link{
  position:absolute;
  left:var(--space-2);
  top:-64px;
  z-index:120;
  padding:10px 18px;
  border-radius:var(--radius-sm);
  background-color:var(--color-accent);
  color:var(--color-accent-ink);
  font-size:var(--text-sm);
  letter-spacing:.08em;
  text-decoration:none;
  transition:top 160ms ease;
}
.skip-link:focus{top:var(--space-1);}

/* =========================================================
   反色页脚
   ========================================================= */
.site-footer{
  margin-top:var(--section-y);
  background-color:var(--color-contrast-surface);
  color:var(--color-contrast-ink);
  border-top:2px solid color-mix(in srgb, var(--color-accent) 55%, var(--color-contrast-line));
}
.footer-inner{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding:var(--space-8) var(--gutter) var(--space-6);
  display:grid;
  grid-template-columns:minmax(220px,1.05fr) 2.2fr;
  gap:var(--space-6);
  align-items:start;
}
.footer-wordmark{
  margin:0 0 var(--space-1);
  font-family:var(--font-heading);
  font-weight:var(--weight-heading);
  font-size:var(--text-xl);
  line-height:1.2;
  letter-spacing:.08em;
  color:var(--color-contrast-ink);
}
.footer-note{
  margin:0 0 var(--space-1);
  font-size:var(--text-sm);
  line-height:1.7;
  color:color-mix(in srgb, var(--color-contrast-ink) 74%, var(--color-contrast-surface));
  max-width:34ch;
}
.footer-note--muted{
  font-family:var(--font-mono);
  font-size:var(--text-xs);
  letter-spacing:.1em;
  color:color-mix(in srgb, var(--color-contrast-ink) 52%, var(--color-contrast-surface));
}
.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:var(--space-4);
}
.footer-col-title{
  margin:0 0 var(--space-2);
  padding-top:var(--space-2);
  border-top:var(--border-thin) solid var(--color-contrast-line);
  font-family:var(--font-heading);
  font-weight:var(--weight-heading);
  font-size:var(--text-sm);
  letter-spacing:.16em;
  color:var(--color-contrast-accent);
}
.footer-col-text{
  margin:0;
  font-size:var(--text-sm);
  line-height:1.75;
  color:color-mix(in srgb, var(--color-contrast-ink) 82%, var(--color-contrast-surface));
}
.footer-links{
  grid-column:1 / -1;
  display:flex;
  flex-wrap:wrap;
  gap:var(--space-3) var(--space-6);
  padding-top:var(--space-4);
  border-top:var(--border-thin) solid var(--color-contrast-line);
}
.footer-links a{
  color:var(--color-contrast-accent);
  font-size:var(--text-sm);
  letter-spacing:.1em;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:border-color 160ms ease, color 160ms ease;
}
.footer-links a:hover{
  color:color-mix(in srgb, var(--color-contrast-accent) 70%, var(--color-contrast-ink));
  border-bottom-color:currentColor;
}
.footer-legal{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding:var(--space-3) var(--gutter) var(--space-6);
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:var(--space-2);
  border-top:var(--border-thin) solid var(--color-contrast-line);
}
.footer-legal-line,
.footer-meta{
  margin:0;
  font-family:var(--font-mono);
  font-size:var(--text-xs);
  letter-spacing:.06em;
  line-height:1.9;
  color:color-mix(in srgb, var(--color-contrast-ink) 68%, var(--color-contrast-surface));
  max-width:64ch;
}

/* =========================================================
   容器 / 章节 / 文字
   ========================================================= */
.wrap{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.wrap--narrow{max-width:calc(var(--measure) + var(--gutter) * 2);}

.section{position:relative;padding-block:var(--section-y);}
.section--lg{padding-block:var(--section-y-lg);}
.section--tight{padding-block:var(--space-8);}
.section--alt{
  background-color:var(--color-surface-alt);
  border-block:var(--border-thin) solid var(--color-line);
}
.section--deep{background-color:var(--color-surface-deep);}
.section--contrast{
  background-color:var(--color-contrast-surface);
  color:var(--color-contrast-ink);
}
.section--contrast h1,
.section--contrast h2,
.section--contrast h3,
.section--contrast h4{color:var(--color-contrast-ink);}
.section--contrast a{color:var(--color-contrast-accent);}
.section--contrast .lede{color:color-mix(in srgb, var(--color-contrast-ink) 84%, var(--color-contrast-surface));}
.section--contrast .rule{border-top-color:var(--color-contrast-line);}
.section--contrast .eyebrow{color:var(--color-contrast-accent);}

.section-head{max-width:var(--measure);margin-bottom:var(--space-6);}
.eyebrow{
  display:flex;
  align-items:center;
  gap:var(--space-2);
  margin:0 0 var(--space-2);
  font-family:var(--font-mono);
  font-size:var(--text-xs);
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--color-primary);
}
.eyebrow::before{
  content:"";
  width:28px;
  height:1px;
  flex:none;
  background:linear-gradient(90deg, var(--color-primary), var(--color-accent));
}
.section-title{
  margin:0 0 var(--space-2);
  font-size:clamp(var(--text-xl), 4.2vw, var(--text-2xl));
}
.lede{
  margin:0;
  font-size:var(--text-lg);
  line-height:1.6;
  color:color-mix(in srgb, var(--color-ink) 86%, var(--color-primary-ink));
  max-width:var(--measure);
}
.prose{max-width:var(--measure);}
.prose > * + *{margin-top:var(--space-2);}
.prose p{margin:0;color:var(--color-ink);}
.prose h3{
  margin:var(--space-4) 0 var(--space-1);
  font-size:var(--text-lg);
}
.prose ul,
.prose ol{padding-left:1.2em;color:var(--color-ink-soft);}
.prose li + li{margin-top:var(--space-1);}
.prose strong{color:color-mix(in srgb, var(--color-ink) 84%, var(--color-primary-ink));font-weight:600;}

.display-title{
  margin:0;
  font-family:var(--font-heading);
  font-weight:var(--weight-heading);
  font-size:var(--text-display);
  line-height:.98;
  letter-spacing:.02em;
  color:color-mix(in srgb, var(--color-ink) 74%, var(--color-primary-ink));
}
.figure-number{
  display:block;
  font-family:var(--font-heading);
  font-weight:var(--weight-heading);
  font-size:var(--text-figure);
  line-height:1;
  letter-spacing:.01em;
  font-variant-numeric:tabular-nums;
  color:var(--color-accent);
}

.rule{
  border:0;
  border-top:var(--border-thin) solid var(--color-line);
  margin:var(--space-6) 0;
}
.rule--metal{
  border:0;
  height:1px;
  background:linear-gradient(90deg,
    var(--color-line),
    color-mix(in srgb, var(--color-primary) 62%, transparent) 45%,
    color-mix(in srgb, var(--color-accent) 52%, transparent) 72%,
    var(--color-line));
  margin:var(--space-6) 0;
}

/* =========================================================
   12 列非对称栅格
   ========================================================= */
.grid{
  display:grid;
  grid-template-columns:repeat(12, minmax(0, 1fr));
  gap:var(--gutter);
  align-items:start;
}
.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-12{grid-column:span 12;}

/* =========================================================
   面板 / 标签 / 元信息
   ========================================================= */
.panel{
  position:relative;
  padding:var(--space-4);
  border:var(--border-thin) solid var(--color-line);
  border-radius:var(--radius-lg);
  background-color:var(--color-surface-alt);
  box-shadow:var(--shadow-1);
}
.panel > :first-child{margin-top:0;}
.panel > :last-child{margin-bottom:0;}
.panel--raised{background-color:var(--color-surface-deep);}
.panel--highlight{
  background-color:var(--color-highlight);
  border-color:color-mix(in srgb, var(--color-accent) 42%, transparent);
}
.panel--edge{border-top:2px solid var(--color-accent);}
.panel--wide{padding:var(--space-6);}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 12px;
  border:var(--border-thin) solid var(--color-line);
  border-radius:var(--radius-pill);
  background-color:color-mix(in srgb, var(--color-surface-deep) 62%, transparent);
  color:var(--color-ink-soft);
  font-family:var(--font-mono);
  font-size:var(--text-xs);
  letter-spacing:.12em;
  white-space:nowrap;
}
.tag--accent{
  background-color:color-mix(in srgb, var(--color-highlight) 82%, transparent);
  border-color:color-mix(in srgb, var(--color-accent) 46%, transparent);
  color:var(--color-accent);
}
.tag--primary{
  background-color:var(--color-primary-soft);
  border-color:color-mix(in srgb, var(--color-primary) 58%, transparent);
  color:color-mix(in srgb, var(--color-ink) 76%, var(--color-primary-ink));
}
.meta{
  font-family:var(--font-mono);
  font-size:var(--text-xs);
  letter-spacing:.1em;
  color:var(--color-ink-muted);
  font-variant-numeric:tabular-nums;
}

/* =========================================================
   按钮
   ========================================================= */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 24px;
  border:var(--border-thin) solid var(--color-line);
  border-radius:var(--radius-pill);
  background-color:transparent;
  color:var(--color-ink);
  font-family:var(--font-body);
  font-size:var(--text-sm);
  letter-spacing:.1em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color 160ms ease, color 160ms ease, border-color 160ms ease, transform 160ms ease;
}
.btn:hover{transform:translateY(-1px);}
.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) 84%, var(--color-primary-ink));}
.btn--accent{
  background-color:var(--color-accent);
  border-color:var(--color-accent);
  color:var(--color-accent-ink);
}
.btn--accent:hover{background-color:color-mix(in srgb, var(--color-accent) 82%, var(--color-surface));}
.btn--ghost:hover{
  background-color:var(--color-surface-deep);
  border-color:color-mix(in srgb, var(--color-primary) 55%, var(--color-line));
}

/* =========================================================
   面包屑
   ========================================================= */
.breadcrumb{
  padding-block:var(--space-3);
  font-family:var(--font-mono);
  font-size:var(--text-xs);
  letter-spacing:.1em;
}
.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:var(--space-1);
  list-style:none;
  margin:0;
  padding:0;
}
.breadcrumb li{display:inline-flex;align-items:center;}
.breadcrumb li + li::before{
  content:"/";
  margin-right:var(--space-1);
  color:var(--color-line);
}
.breadcrumb a{color:var(--color-ink-soft);text-decoration:none;}
.breadcrumb a:hover{color:var(--color-accent);}
.breadcrumb [aria-current="page"]{color:var(--color-ink);}

/* =========================================================
   图片容器（去边直角 + 叠层遮罩）
   ========================================================= */
.figure-frame{
  position:relative;
  overflow:hidden;
  border:var(--border-thin) solid var(--color-line);
  border-radius:0;
  background-color:var(--color-surface-alt);
  box-shadow:var(--shadow-1);
}
.figure-frame img,
.figure-frame svg{
  width:100%;
  height:100%;
  object-fit:cover;
  border-radius:0;
}
.figure-frame[data-ratio="16x9"]{aspect-ratio:16 / 9;}
.figure-frame[data-ratio="4x3"]{aspect-ratio:4 / 3;}
.figure-frame[data-ratio="3x2"]{aspect-ratio:3 / 2;}
.figure-frame[data-ratio="1x1"]{aspect-ratio:1 / 1;}
.figure-frame[data-ratio="free"]{aspect-ratio:auto;}
.figure-frame--edge{border-left:2px solid var(--color-accent);}
.figure-caption{
  position:absolute;
  inset-inline:0;
  bottom:0;
  padding:var(--space-3);
  background:var(--overlay-scrim);
  color:var(--color-contrast-ink);
  font-size:var(--text-sm);
  line-height:1.6;
}
.figure-caption .meta{color:color-mix(in srgb, var(--color-contrast-ink) 74%, var(--color-contrast-surface));}

/* =========================================================
   核参数矩阵
   ========================================================= */
.table-scroll{
  overflow-x:auto;
  border:var(--border-thin) solid var(--color-line);
  border-radius:var(--radius-md);
  background-color:color-mix(in srgb, var(--color-surface-alt) 92%, transparent);
  -webkit-overflow-scrolling:touch;
}
.data-table{
  width:100%;
  min-width:620px;
  border-collapse:collapse;
  font-family:var(--font-mono);
  font-size:var(--text-sm);
  font-variant-numeric:tabular-nums;
}
.data-table caption{
  padding:var(--space-3) var(--space-3) var(--space-2);
  text-align:left;
  font-family:var(--font-body);
  font-size:var(--text-sm);
  letter-spacing:.08em;
  color:var(--color-ink-soft);
}
.data-table th,
.data-table td{
  padding:12px 16px;
  text-align:left;
  border-bottom:var(--border-thin) solid var(--color-line);
  white-space:nowrap;
}
.data-table thead th{
  background-color:var(--color-surface-deep);
  color:var(--color-ink);
  font-family:var(--font-body);
  font-size:var(--text-xs);
  font-weight:600;
  letter-spacing:.14em;
}
.data-table tbody tr:hover{
  background-color:color-mix(in srgb, var(--color-surface-deep) 55%, transparent);
}
.data-table tbody tr[data-selected="true"],
.data-table tbody tr[aria-selected="true"]{
  background-color:var(--color-highlight);
}
.data-table td[data-diff="true"],
.data-table th[data-diff="true"]{
  color:var(--color-accent);
  box-shadow:inset 2px 0 0 var(--color-accent);
}
.data-table tfoot td{
  border-bottom:0;
  color:var(--color-ink-muted);
  font-size:var(--text-xs);
}

/* =========================================================
   标签页 / 筛选 / 折叠
   ========================================================= */
.tabs{margin:0;}
.tabs-list{
  display:flex;
  flex-wrap:wrap;
  gap:var(--space-1);
  border-bottom:var(--border-thin) solid var(--color-line);
}
.tab{
  appearance:none;
  padding:10px 18px;
  border:0;
  border-bottom:2px solid transparent;
  background-color:transparent;
  color:var(--color-ink-soft);
  font-family:var(--font-body);
  font-size:var(--text-sm);
  letter-spacing:.1em;
  cursor:pointer;
  transition:background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}
.tab:hover{color:var(--color-ink);background-color:color-mix(in srgb, var(--color-primary-soft) 70%, transparent);}
.tab[aria-selected="true"]{
  color:color-mix(in srgb, var(--color-ink) 80%, var(--color-primary-ink));
  border-bottom-color:var(--color-accent);
  background-color:var(--color-primary-soft);
}
.tab:focus-visible{outline:2px solid var(--color-focus);outline-offset:-2px;}
.tab-panel{padding-top:var(--space-4);}
.tab-panel[hidden]{display:none;}

.filters{
  display:flex;
  flex-wrap:wrap;
  gap:var(--space-1);
  margin-bottom:var(--space-4);
}
.filter-chip{
  appearance:none;
  padding:8px 16px;
  border:var(--border-thin) solid var(--color-line);
  border-radius:var(--radius-pill);
  background-color:transparent;
  color:var(--color-ink-soft);
  font-family:var(--font-mono);
  font-size:var(--text-xs);
  letter-spacing:.12em;
  cursor:pointer;
  transition:background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}
.filter-chip:hover{
  border-color:color-mix(in srgb, var(--color-primary) 55%, var(--color-line));
  color:var(--color-ink);
}
.filter-chip[aria-pressed="true"]{
  background-color:var(--color-primary);
  border-color:var(--color-primary);
  color:var(--color-primary-ink);
}
[data-filter-item][hidden]{display:none;}

.disclosure{
  border:var(--border-thin) solid var(--color-line);
  border-radius:var(--radius-md);
  background-color:var(--color-surface-alt);
  overflow:hidden;
}
.disclosure + .disclosure{margin-top:var(--space-2);}
.disclosure-trigger{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:var(--space-3);
  padding:var(--space-2) var(--space-3);
  border:0;
  background-color:transparent;
  color:color-mix(in srgb, var(--color-ink) 82%, var(--color-primary-ink));
  font-family:var(--font-heading);
  font-weight:var(--weight-heading);
  font-size:var(--text-lg);
  letter-spacing:.04em;
  text-align:left;
  cursor:pointer;
  transition:background-color 160ms ease;
}
.disclosure-trigger::after{
  content:"＋";
  flex:none;
  font-family:var(--font-mono);
  font-size:var(--text-base);
  color:var(--color-accent);
}
.disclosure-trigger[aria-expanded="true"]{background-color:var(--color-primary-soft);}
.disclosure-trigger[aria-expanded="true"]::after{content:"－";}
.disclosure-panel{
  padding:0 var(--space-3) var(--space-3);
  color:var(--color-ink-soft);
  border-top:var(--border-thin) solid var(--color-line);
  padding-top:var(--space-3);
}
.disclosure-panel[hidden]{display:none;}

/* =========================================================
   通用工具类与显现动效
   ========================================================= */
.visually-hidden{
  position:absolute !important;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}
[hidden]{display:none !important;}

html.js-reveal-on [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity 200ms ease, transform 200ms ease;
}
html.js-reveal-on [data-reveal].is-visible{
  opacity:1;
  transform:none;
}
.stagger > [data-reveal]:nth-child(2){transition-delay:60ms;}
.stagger > [data-reveal]:nth-child(3){transition-delay:120ms;}
.stagger > [data-reveal]:nth-child(4){transition-delay:180ms;}
.stagger > [data-reveal]:nth-child(5){transition-delay:240ms;}
.stagger > [data-reveal]:nth-child(n+6){transition-delay:300ms;}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1079px){
  .col-4{grid-column:span 6;}
  .col-5,
  .col-6{grid-column:span 6;}
  .col-7,
  .col-8{grid-column:span 12;}
  .brand-tagline{max-width:32ch;}
  .footer-inner{grid-template-columns:1fr;gap:var(--space-4);}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:899px){
  :root{--section-y:72px;--section-y-lg:96px;}
  .header-inner{min-height:68px;}
  .brand-tagline{display:none;}
  .brand-name{font-size:var(--text-base);}
  .nav-toggle{display:inline-flex;}
  .site-nav{
    display:none;
    position:absolute;
    left:0;
    right:0;
    top:100%;
    flex-direction:column;
    align-items:stretch;
    gap:var(--space-2);
    padding:var(--space-3) var(--gutter) var(--space-4);
    background-color:var(--color-surface-alt);
    border-top:var(--border-thin) solid var(--color-line);
    border-bottom:var(--border-thin) solid var(--color-line);
    box-shadow:var(--shadow-2);
  }
  .site-nav[data-open="true"]{display:flex;}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;}
  .nav-list li + li{border-top:var(--border-thin) solid var(--color-line);}
  .nav-list a{display:block;padding:var(--space-2) 0;font-size:var(--text-base);}
  .nav-list a::after{display:none;}
  .nav-list a[aria-current="page"]{color:var(--color-accent);}
  .nav-cta{justify-content:center;padding:14px 20px;}
  .footer-cols{grid-template-columns:1fr;}
  .footer-links{flex-direction:column;gap:var(--space-2);}
  .data-table{min-width:520px;}
}

@media (max-width:767px){
  .col-4,
  .col-5,
  .col-6,
  .col-7,
  .col-8,
  .col-12{grid-column:span 12;}
  .panel{padding:var(--space-3);}
  .panel--wide{padding:var(--space-4);}
  .figure-caption{padding:var(--space-2);}
  .footer-legal{flex-direction:column;gap:var(--space-1);}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.js-reveal-on [data-reveal]{transform:none;}
  .btn:hover{transform:none;}
}