/* ==========================================================================
   新葡萄8883官网 · 全站共享站件  /assets/site.css
   1) 设计定稿变量（脚本产出，逐字使用）  2) Reset  3) 中文排版
   4) 页头  5) 页脚  6) 通用组件  7) 响应式  8) 动效降级
   ========================================================================== */

/* ---------- 1. 设计定稿变量 ---------- */
:root {
  --color-surface: #fcfcfc;
  --color-surface-alt: #f2f2f2;
  --color-surface-deep: #e4e4e3;
  --color-ink: #37322f;
  --color-ink-soft: #685f5a;
  --color-ink-muted: #847b76;
  --color-line: #d9d8d7;
  --color-primary: #ca4c07;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #f5e3da;
  --color-accent: #167ab6;
  --color-accent-ink: #ffffff;
  --color-highlight: #d3e5ef;
  --color-focus: #0b77b6;
  --color-contrast-surface: #2d1c13;
  --color-contrast-ink: #e7e5e4;
  --color-contrast-line: #564841;
  --color-contrast-accent: #1c99e3;
  --overlay-scrim: linear-gradient(180deg, rgba(45, 28, 19, 0.35) 0%, rgba(45, 28, 19, 0.72) 55%, rgba(45, 28, 19, 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: 10.4px;
  --text-sm: 13.9px;
  --text-base: 16px;
  --text-lg: 21.3px;
  --text-xl: 28.4px;
  --text-2xl: 37.9px;
  --text-3xl: 50.5px;
  --text-4xl: 67.3px;
  --text-display: clamp(56px, 11.5vw, 147px);
  --text-figure: clamp(47px, 8.3vw, 106px);
  --weight-heading: 870;
  --weight-body: 400;
  --leading-body: 1.6;
  --leading-heading: 1.15;
  --tracking-heading: -0.021em;
  --radius-sm: 4px;
  --radius-md: 4px;
  --radius-lg: 4px;
  --radius-pill: 4px;
  --border-thin: 2px;
  --border-thick: 3px;
  --shadow-1: 4px 4px 0 #37322f;
  --shadow-2: 8px 8px 0 #37322f;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1300px;
  --measure: 68ch;
  --gutter: 24px;
  --section-y: 81px;
  --section-y-lg: 113px;
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  --header-h: 116px;
}

body {
  margin: 0;
  background-color: 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);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ul, ol, pre { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video, picture { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; }
hr { border: 0; }

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

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

/* ---------- 3. 中文排版与文本层 ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-wrap: balance;
}
h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5, h6 { font-size: var(--text-base); }
p { text-wrap: pretty; }

.num, .mono, time, code, kbd, samp {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
  font-feature-settings: "tnum" 1;
}

.t-lead { font-size: var(--text-lg); line-height: 1.5; color: var(--color-ink-soft); }
.t-small { font-size: var(--text-sm); }
.t-tiny { font-size: var(--text-xs); letter-spacing: 0.06em; color: var(--color-ink-muted); }
.muted { color: var(--color-ink-soft); }
.muted-more { color: var(--color-ink-muted); }

.link-inline, .prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
.link-inline:hover, .prose a:hover { color: var(--color-primary); }

.prose { max-width: var(--measure); }
.prose > * + * { margin-top: var(--space-3); }
.prose h2 { margin-top: var(--space-8); }
.prose h3 { margin-top: var(--space-6); }
.prose strong { font-weight: 800; }
.prose ul li { position: relative; padding-left: var(--space-3); }
.prose ul li + li { margin-top: 8px; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.62em;
  width: 10px; height: 3px;
  background: var(--color-primary);
  transform: skewX(-30deg);
}
.prose ol { counter-reset: pn; }
.prose ol li { counter-increment: pn; position: relative; padding-left: var(--space-4); }
.prose ol li + li { margin-top: 8px; }
.prose ol li::before {
  content: counter(pn, decimal-leading-zero);
  position: absolute; left: 0; top: 0.15em;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
}

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

.grid { display: grid; gap: var(--space-3); }
.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--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.g-1 { grid-column: span 1; }
.g-2 { grid-column: span 2; }
.g-3 { grid-column: span 3; }
.g-4 { grid-column: span 4; }
.g-5 { grid-column: span 5; }
.g-6 { grid-column: span 6; }
.g-7 { grid-column: span 7; }
.g-8 { grid-column: span 8; }
.g-9 { grid-column: span 9; }
.g-10 { grid-column: span 10; }
.g-11 { grid-column: span 11; }
.g-12 { grid-column: span 12; }

.stagger { display: grid; gap: var(--space-3); }

/* ---------- 4. 页头 ---------- */
.scroll-progress {
  position: fixed;
  top: 0; right: 0; bottom: auto; left: 0;
  height: 4px;
  z-index: 130;
  background: var(--color-surface-deep);
  pointer-events: none;
}
.scroll-progress span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary) 45%, var(--color-accent) 100%);
  transition: width 90ms linear;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: var(--border-thick) solid var(--color-ink);
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -90px;
  z-index: 200;
  display: inline-block;
  padding: 11px 18px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  font-weight: 800;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
  transition: top 160ms ease;
}
.skip-link:focus, .skip-link:focus-visible { top: 10px; }

.header-strip {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  max-height: 80px;
  overflow: hidden;
  transition: max-height 240ms ease, opacity 200ms ease;
}
.header-strip__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  min-height: 38px;
  padding-block: 8px;
}
.strip-note {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-contrast-accent);
}
.strip-contact {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}
.strip-contact .num { color: var(--color-contrast-ink); }
.strip-sep {
  display: inline-block;
  width: 14px;
  height: 2px;
  background: var(--color-primary);
  transform: skewX(-30deg);
}

.header-main {
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-surface) 62%, var(--color-surface-alt) 100%);
}
.header-main__inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 78px;
  padding-block: var(--space-2);
  transition: min-height 200ms ease, padding 200ms ease;
}
.site-header.is-condensed .header-strip { max-height: 0; opacity: 0; }
.site-header.is-condensed .header-main__inner { min-height: 62px; padding-block: 8px; }

.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  flex: 0 0 auto;
}
.brand__mark {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: 1;
  letter-spacing: -0.045em;
  color: var(--color-ink);
  transition: color 160ms ease;
}
.brand__mark::after {
  content: "";
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-left: 8px;
  background: var(--color-primary);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}
.brand__sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}
.brand:hover .brand__mark { color: var(--color-primary); }

.header-slice {
  flex: 0 1 auto;
  width: clamp(48px, 12vw, 200px);
  height: 12px;
  margin-left: var(--space-3);
  background: linear-gradient(90deg, var(--color-primary) 0 50%, var(--color-accent) 50% 100%);
  transform: skewX(-24deg);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: auto;
}
.nav-list { display: flex; align-items: center; gap: 2px; }
.nav-list a {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 12px;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--color-ink-soft);
  border-radius: var(--radius-sm);
  transition: background-color 160ms ease, color 160ms ease;
}
.nav-list a:hover { background: var(--color-primary-soft); color: var(--color-primary); }
.nav-list a[aria-current="page"] {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.nav-cta { flex: 0 0 auto; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 10px 16px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 800;
  letter-spacing: 0.04em;
  box-shadow: var(--shadow-1);
  transition: background-color 160ms ease, color 160ms ease, transform 160ms ease;
}
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 20px;
  height: 16px;
}
.nav-toggle__bars i {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  transition: transform 200ms ease, opacity 160ms ease, width 200ms ease;
}
.nav-toggle__bars i:nth-child(2) { width: 66%; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.nav-toggle:hover { background: var(--color-primary); color: var(--color-primary-ink); }

/* ---------- 5. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: var(--section-y-lg);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.footer-slice {
  height: 14px;
  background: linear-gradient(90deg, var(--color-primary) 0 40%, var(--color-accent) 40% 100%);
  clip-path: polygon(0 0, 100% 0, 100% 42%, 0 100%);
}
.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
  gap: var(--space-8);
  padding-block: var(--space-8) var(--space-6);
}
.footer-mark {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: 1.05;
  letter-spacing: -0.045em;
  color: var(--color-contrast-ink);
}
.footer-sub {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-accent);
}
.footer-summary {
  margin-top: var(--space-4);
  max-width: 34ch;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}
.footer-col__title {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--color-contrast-accent);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.footer-col li + li { margin-top: 10px; }
.footer-col a {
  display: inline-block;
  font-size: var(--text-sm);
  padding-bottom: 2px;
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent);
  border-bottom: 2px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}
.footer-col a:hover { color: var(--color-contrast-ink); border-bottom-color: var(--color-primary); }

.footer-base {
  display: grid;
  gap: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  padding-block: var(--space-4) var(--space-6);
}
.footer-contact {
  max-width: 92ch;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 86%, transparent);
}
.footer-note {
  max-width: 76ch;
  font-size: var(--text-xs);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.footer-end {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  padding-top: var(--space-2);
}
.footer-legal { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.footer-legal a {
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  padding-bottom: 2px;
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
  border-bottom: 2px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}
.footer-legal a:hover { color: var(--color-contrast-ink); border-bottom-color: var(--color-accent); }
.footer-icp, .footer-copy {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 56%, transparent);
}
.footer-copy { margin-left: auto; }

/* ---------- 6. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.02em;
  text-align: center;
  border: var(--border-thick) solid var(--color-ink);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
  transition: transform 150ms ease, box-shadow 150ms ease, background-color 150ms ease, color 150ms ease, border-color 150ms ease;
  cursor: pointer;
}
.btn:hover { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--color-ink); }
.btn:active { transform: translate(4px, 4px); box-shadow: none; }
.btn--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.btn--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.btn--dark { background: var(--color-contrast-surface); color: var(--color-contrast-ink); border-color: var(--color-contrast-surface); }
.btn--onDark {
  background: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  box-shadow: 3px 3px 0 var(--color-contrast-line);
}
.btn--ghost { background: transparent; color: var(--color-ink); box-shadow: none; }
.btn--ghost:hover { background: var(--color-primary-soft); color: var(--color-primary); transform: none; box-shadow: none; }
.btn--sm { padding: 9px 15px; font-size: var(--text-xs); box-shadow: 3px 3px 0 var(--color-ink); }
.btn--sm:hover { box-shadow: 2px 2px 0 var(--color-ink); }
.btn--block { width: 100%; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-primary);
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-primary);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-4);
  margin-bottom: var(--space-6);
}
.section-head__title { font-size: var(--text-2xl); }
.section-head__note { max-width: 44ch; font-size: var(--text-sm); color: var(--color-ink-muted); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}

.mark-invert {
  display: inline-block;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.mark-invert--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.mark-invert--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.mark-invert--onDark { background: var(--color-contrast-accent); color: var(--color-contrast-surface); }

.panel {
  position: relative;
  padding: var(--space-6);
  background: var(--color-surface);
  color: var(--color-ink);
  border: var(--border-thick) solid var(--color-ink);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-2);
}
.panel--alt { background: var(--color-surface-alt); }
.panel--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: var(--color-contrast-surface);
}
.panel--primary h2, .panel--primary h3, .panel--primary h4 { color: var(--color-primary-ink); }
.panel--primary .t-lead, .panel--primary .muted { color: color-mix(in srgb, var(--color-primary-ink) 82%, transparent); }
.panel--accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  border-color: var(--color-contrast-surface);
}
.panel--accent h2, .panel--accent h3, .panel--accent h4 { color: var(--color-accent-ink); }
.panel--accent .t-lead, .panel--accent .muted { color: color-mix(in srgb, var(--color-accent-ink) 82%, transparent); }
.panel--dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}
.panel--dark h2, .panel--dark h3, .panel--dark h4 { color: var(--color-contrast-ink); }
.panel--dark .t-lead { color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent); }
.panel--dark .muted { color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent); }
.panel--dark .muted-more { color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent); }
.panel--dark .num { color: var(--color-contrast-accent); }

.slant-b { clip-path: polygon(0 0, 100% 0, 100% calc(100% - 32px), 0 100%); }
.slant-t { clip-path: polygon(0 32px, 100% 0, 100% 100%, 0 100%); }
.slant-r { clip-path: polygon(0 0, 100% 0, calc(100% - 32px) 100%, 0 100%); }

.rule { height: var(--border-thin); background: var(--color-line); }
.rule--slant {
  height: 10px;
  background: linear-gradient(90deg, var(--color-primary) 0 30%, var(--color-accent) 30% 100%);
  clip-path: polygon(0 0, 100% 0, 100% 28%, 0 100%);
}

.stat { display: grid; gap: 6px; }
.stat__figure {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-2xl);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-primary);
}
.stat__figure.is-display { font-size: var(--text-figure); }
.stat__label { font-size: var(--text-xs); letter-spacing: 0.1em; color: var(--color-ink-muted); }
.panel--dark .stat__figure, .panel--primary .stat__figure { color: var(--color-primary-ink); }
.panel--dark .stat__label, .panel--primary .stat__label { color: color-mix(in srgb, var(--color-primary-ink) 72%, transparent); }

.media-frame {
  position: relative;
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-surface-deep);
  border: var(--border-thick) solid var(--color-ink);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-2);
  isolation: isolate;
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame--43 { aspect-ratio: 4 / 3; }
.media-frame--32 { aspect-ratio: 3 / 2; }
.media-frame--11 { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 16 / 7; }
.media-frame__scrim { position: absolute; inset: 0; background: var(--overlay-scrim); }
.media-frame__body {
  position: absolute;
  left: var(--space-4); right: var(--space-4); bottom: var(--space-4);
  z-index: 2;
  color: var(--color-contrast-ink);
}
.media-frame__body h2, .media-frame__body h3, .media-frame__body h4 { color: var(--color-contrast-ink); }
.media-frame__caption {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 2;
  padding: var(--space-4);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
}
.media-frame__tag {
  position: absolute;
  top: var(--space-3); left: var(--space-3);
  z-index: 2;
  padding: 4px 10px;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
}

.path { display: grid; gap: var(--space-6); }
.path__step {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: var(--space-3);
}
.path__step:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 27px;
  top: 56px;
  height: var(--space-6);
  width: var(--border-thin);
  background: var(--color-accent);
}
.path__node {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  clip-path: polygon(0 0, 100% 0, 100% 78%, 78% 100%, 0 100%);
}
.path__step--active .path__node { background: var(--color-primary); color: var(--color-primary-ink); }

.acc { border-top: var(--border-thick) solid var(--color-ink); }
.acc__item { border-bottom: var(--border-thin) solid var(--color-line); }
.acc__head { margin: 0; }
.acc__trigger {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  padding: 20px 56px 20px 0;
  text-align: left;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  line-height: 1.35;
  color: var(--color-ink);
  border-left: 6px solid transparent;
  transition: background-color 180ms ease, border-color 180ms ease, padding-left 180ms ease, color 180ms ease;
}
.acc__trigger::after {
  content: "";
  position: absolute;
  right: 16px;
  top: 50%;
  width: 12px;
  height: 12px;
  margin-top: -6px;
  background: var(--color-accent);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
  transition: transform 200ms ease, background-color 200ms ease;
}
.acc__trigger:hover { background: var(--color-surface-alt); }
.acc__trigger[aria-expanded="true"] {
  border-left-color: var(--color-primary);
  padding-left: 16px;
  background: color-mix(in srgb, var(--color-primary-soft) 72%, transparent);
}
.acc__trigger[aria-expanded="true"]::after { transform: rotate(90deg); background: var(--color-primary); }
.acc__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 220ms cubic-bezier(0.2, 0.7, 0.3, 1);
}
.acc__panel[data-open] { grid-template-rows: 1fr; }
.acc__body { overflow: hidden; }
.acc__body > * { padding-bottom: var(--space-2); }
.acc__body > :first-child { padding-top: 4px; }
.acc__body > :last-child { padding-bottom: var(--space-4); }

.tbl-wrap {
  overflow-x: auto;
  background: var(--color-surface);
  border: var(--border-thick) solid var(--color-ink);
}
.tbl { width: 100%; min-width: 640px; font-size: var(--text-sm); }
.tbl caption {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.tbl th, .tbl td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.tbl thead th {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-weight: 800;
  letter-spacing: 0.02em;
  border-bottom: 0;
}
.tbl tbody tr:nth-child(even) { background: var(--color-surface-alt); }
.tbl tbody tr:hover { background: var(--color-primary-soft); }
.tbl [data-col-active] { background: var(--color-highlight); }
.tbl .is-num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}
.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before {
  content: "";
  width: 9px;
  height: 2px;
  background: var(--color-primary);
  transform: skewX(-30deg);
}
.breadcrumb a { color: var(--color-ink-soft); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb [aria-current="page"] { color: var(--color-ink); }

.to-top {
  position: fixed;
  right: var(--gutter);
  bottom: var(--gutter);
  z-index: 90;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  line-height: 1;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 200ms ease, transform 200ms ease, visibility 200ms ease, background-color 160ms ease, color 160ms ease;
  cursor: pointer;
}
.to-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--color-primary); color: var(--color-primary-ink); border-color: var(--color-primary); }

/* ---------- 7. 响应式 ---------- */
@media (min-width: 1024px) {
  .stagger > *:nth-child(even) { margin-top: var(--space-8); }
}

@media (max-width: 1023px) {
  .header-slice { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--header-h, 116px);
    max-height: calc(100dvh - var(--header-h, 116px));
    overflow-y: auto;
    display: block;
    margin: 0;
    padding: var(--space-4) var(--gutter) var(--space-8);
    background: var(--color-contrast-surface);
    color: var(--color-contrast-ink);
    border-top: var(--border-thick) solid var(--color-primary);
    box-shadow: var(--shadow-2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity 200ms ease, transform 200ms ease, visibility 200ms ease;
  }
  .site-nav[data-open] { opacity: 1; visibility: visible; transform: none; }

  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-list a {
    height: auto;
    padding: 16px 6px;
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: var(--weight-heading);
    letter-spacing: var(--tracking-heading);
    color: var(--color-contrast-ink);
    border-radius: 0;
    border-bottom: var(--border-thin) solid var(--color-contrast-line);
  }
  .nav-list a:hover { background: transparent; color: var(--color-contrast-accent); }
  .nav-list a[aria-current="page"] {
    background: var(--color-primary);
    color: var(--color-primary-ink);
    padding-left: 14px;
  }
  .nav-cta { width: 100%; margin-top: var(--space-4); }

  html:not(.js) .site-nav {
    position: static;
    max-height: none;
    margin-top: var(--space-3);
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .g-5, .g-6, .g-7, .g-8, .g-9, .g-10, .g-11, .g-12 { grid-column: span 6; }

  .footer-inner { grid-template-columns: minmax(0, 1fr); gap: var(--space-6); }
  .footer-summary { max-width: 52ch; }
}

@media (max-width: 639px) {
  :root { --gutter: 18px; }

  .header-strip__inner { justify-content: flex-start; }
  .strip-contact { gap: 8px; }
  .header-main__inner { min-height: 68px; }
  .brand__mark { font-size: var(--text-lg); }

  .grid--2, .grid--3, .grid--4, .grid--12 { grid-template-columns: minmax(0, 1fr); }
  .g-2, .g-3, .g-4, .g-5, .g-6, .g-7, .g-8, .g-9, .g-10, .g-11, .g-12 { grid-column: span 12; }

  .panel { padding: var(--space-4); }
  .section-head { margin-bottom: var(--space-4); }
  .section-head__title { font-size: var(--text-xl); }

  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .footer-copy { margin-left: 0; }
  .footer-end { align-items: flex-start; }

  .acc__trigger { font-size: var(--text-base); padding-right: 44px; }
  .to-top { right: 16px; bottom: 16px; }
}

/* ---------- 8. 显现与动效降级 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 500ms ease, transform 500ms cubic-bezier(0.2, 0.7, 0.3, 1);
}
.js [data-reveal].is-in { opacity: 1; transform: none; }

@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;
  }
  .js [data-reveal] { opacity: 1 !important; transform: none !important; }
  .btn:hover, .btn:active { transform: none; }
}