/* ============================================================
   盛世指南 / 共享样式表 /assets/site.css
   蓝图网格 × 东方秩序：刊头、页脚与通用组件
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 148px;
  background: #F7F4EF;
}

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, figcaption, blockquote,
dl, dt, dd, table, th, td { margin: 0; padding: 0; }

ul, ol { list-style: none; }

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

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

button { background: none; border: 0; cursor: pointer; }

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

table { border-collapse: collapse; border-spacing: 0; width: 100%; }

h1, h2, h3, h4, h5, h6 { font-weight: 700; }

main { display: block; }

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 品牌色 */
  --c-red: #C8102E;
  --c-red-deep: #8E0B20;
  --c-gold: #C9A96E;
  --c-gold-light: #E6D6B8;
  --c-ink: #1A1A1A;
  --c-graphite: #4A4A4A;
  --c-text: #333333;
  --c-porcelain: #F7F4EF;
  --c-white: #FFFFFF;
  --c-jade: #3A7D6B;
  --c-jade-light: #DCEAE5;
  --c-amber: #B8741A;
  --c-blueprint: #6B7A8F;

  /* 线与网格 */
  --c-line: rgba(26, 26, 26, 0.14);
  --c-line-soft: rgba(26, 26, 26, 0.08);
  --c-grid: rgba(107, 122, 143, 0.16);

  /* 字体 */
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", STSong, SimSun, Georgia, "Times New Roman", serif;
  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Sarasa Mono SC", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  /* 尺度 */
  --wrap-max: 1400px;
  --gutter: clamp(20px, 4.5vw, 96px);
  --gap: 24px;
  --shadow-paper: 6px 6px 0 rgba(26, 26, 26, 0.06);
  --shadow-lift: 10px 12px 0 rgba(26, 26, 26, 0.09);
  --ease: cubic-bezier(0.22, 0.68, 0.32, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--c-porcelain);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  line-height: 1.3;
  letter-spacing: 0.05em;
  color: var(--c-ink);
}

h1 { font-size: clamp(30px, 5vw, 48px); line-height: 1.25; letter-spacing: 0.06em; }
h2 { font-size: clamp(24px, 3.4vw, 32px); line-height: 1.38; letter-spacing: 0.05em; }
h3 { font-size: clamp(19px, 2.1vw, 22px); line-height: 1.45; letter-spacing: 0.04em; font-weight: 600; }
h4 { font-size: 17px; letter-spacing: 0.04em; }

.mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.lede {
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.9;
  color: var(--c-graphite);
  letter-spacing: 0.02em;
  max-width: 30em;
}

.prose {
  max-width: 34em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--c-text);
}

.prose p + p { margin-top: 1em; }
.prose strong { font-weight: 600; color: var(--c-ink); }
.prose em { font-style: normal; color: var(--c-red-deep); }

.prose ul,
.prose ol { margin-top: 0.8em; padding-left: 1.3em; }
.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose li { margin-top: 0.4em; }
.prose li::marker { color: var(--c-gold); }
.prose code { font-family: var(--font-mono); font-size: 0.9em; background: rgba(201, 169, 110, 0.16); padding: 1px 5px; }
.prose a { color: var(--c-red-deep); border-bottom: 1px solid rgba(200, 16, 46, 0.35); }
.prose a:hover { border-bottom-color: var(--c-red); }

::selection { background: var(--c-red); color: var(--c-white); }

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

.site-footer :focus-visible { outline-color: var(--c-gold); }

/* ---------- 4. 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.section { padding-top: clamp(48px, 6vw, 88px); padding-bottom: clamp(48px, 6vw, 88px); }
.section-tight { padding-top: clamp(28px, 3.5vw, 48px); padding-bottom: clamp(28px, 3.5vw, 48px); }

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

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

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -120px;
  z-index: 300;
  padding: 10px 20px;
  background: var(--c-ink);
  color: var(--c-porcelain);
  font-size: 13px;
  letter-spacing: 0.12em;
  border: 1px solid var(--c-gold);
  transition: top 0.22s var(--ease);
}

.skip-link:focus {
  top: 16px;
  outline: 2px solid var(--c-gold);
  outline-offset: 2px;
}

/* ---------- 6. 刊头 ---------- */
.site-header {
  position: relative;
  z-index: 80;
  background-color: var(--c-porcelain);
  transition: box-shadow 0.3s var(--ease);
}

.site-header.is-stuck { box-shadow: 0 12px 30px rgba(26, 26, 26, 0.09); }

.masthead-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--c-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--c-grid) 1px, transparent 1px);
  background-size: 64px 32px;
  background-position: -1px -1px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.42), rgba(0, 0, 0, 1));
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.42), rgba(0, 0, 0, 1));
}

.masthead-inner {
  position: relative;
  z-index: 1;
}

.mast-top {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  padding-top: 26px;
  padding-bottom: 12px;
}

.mast-meta {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-blueprint);
  line-height: 1.8;
}

.mast-meta .mono { font-size: 12px; letter-spacing: 0.14em; }
.mast-meta-left { justify-self: start; }
.mast-meta-right { justify-self: end; }

.mast-brand {
  grid-column: 2;
  display: block;
  text-align: center;
  padding: 0 8px;
}

.mast-brand-name {
  display: block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(23px, 3.2vw, 34px);
  letter-spacing: 0.22em;
  text-indent: 0.22em;
  color: var(--c-ink);
  transition: color 0.26s var(--ease);
}

.mast-brand:hover .mast-brand-name { color: var(--c-red-deep); }

.mast-brand-sub {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: 0.28em;
  text-indent: 0.28em;
  color: var(--c-blueprint);
}

/* 状态标签 */
.status-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.1em;
  border: 1px solid currentColor;
  white-space: nowrap;
}

.status-tag-jade {
  color: var(--c-jade);
  background-color: var(--c-jade-light);
  border-color: rgba(58, 125, 107, 0.4);
}

.status-tag-amber {
  color: var(--c-amber);
  background-color: rgba(184, 116, 26, 0.1);
  border-color: rgba(184, 116, 26, 0.4);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--c-jade);
  box-shadow: 0 0 0 3px rgba(58, 125, 107, 0.18);
  flex: none;
}

.status-tag-amber .status-dot { background-color: var(--c-amber); box-shadow: 0 0 0 3px rgba(184, 116, 26, 0.18); }

/* 移动抽屉按钮 */
.nav-toggle {
  display: none;
  width: 100%;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 12px;
  border-top: 1px solid var(--c-line-soft);
  border-bottom: 1px solid var(--c-line-soft);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--c-ink);
}

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 18px;
  height: 12px;
  flex: none;
}

.nav-toggle-bars span {
  display: block;
  height: 1.5px;
  background-color: var(--c-ink);
  transform-origin: center;
  transition: transform 0.3s var(--ease), opacity 0.2s linear, background-color 0.24s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span { background-color: var(--c-red); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(5.25px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) { transform: translateY(-5.25px) rotate(-45deg); }

/* 栏目导航 */
.mast-nav { padding-top: 4px; }

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0 clamp(10px, 2.6vw, 38px);
}

.nav-item { display: flex; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 4px 14px;
  font-size: 15px;
  letter-spacing: 0.09em;
  color: var(--c-ink);
  transition: color 0.24s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 7px;
  height: 2px;
  background-color: var(--c-gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.34s var(--ease), background-color 0.24s var(--ease);
}

.nav-link:hover { color: var(--c-red-deep); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link:focus-visible::after { transform: scaleX(1); }

.nav-link[aria-current="page"] {
  color: var(--c-red-deep);
  font-weight: 500;
}

.nav-link[aria-current="page"]::after {
  background-color: var(--c-red);
  transform: scaleX(1);
}

.nav-idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0;
  color: var(--c-blueprint);
  transform: translateY(-5px);
  transition: color 0.24s var(--ease);
}

.nav-link:hover .nav-idx { color: var(--c-gold); }
.nav-link[aria-current="page"] .nav-idx { color: var(--c-red); }

/* 金线 + 滚动进度 */
.header-rule {
  position: relative;
  height: 1px;
  background-image: linear-gradient(90deg,
    rgba(201, 169, 110, 0.14) 0%,
    var(--c-gold) 16%,
    var(--c-gold) 84%,
    rgba(201, 169, 110, 0.14) 100%);
}

.scroll-progress {
  position: absolute;
  left: 0;
  top: -1px;
  width: 100%;
  height: 3px;
  display: block;
  background-color: var(--c-red);
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 96px);
  padding: clamp(48px, 6vw, 76px) 0 28px;
  background-color: var(--c-ink);
  color: rgba(247, 244, 239, 0.8);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background-image: linear-gradient(90deg, var(--c-red-deep) 0%, var(--c-red) 28%, var(--c-gold) 72%, var(--c-gold-light) 100%);
}

.footer-inner { position: relative; z-index: 1; }

.footer-top {
  display: grid;
  grid-template-columns: minmax(230px, 1fr) 2fr;
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.4vw, 27px);
  font-weight: 700;
  letter-spacing: 0.2em;
  text-indent: 0.2em;
  color: var(--c-porcelain);
}

.footer-brand-sub {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-gold);
}

.footer-brand-desc {
  margin-top: 16px;
  max-width: 24em;
  font-size: 14px;
  line-height: 1.9;
  color: rgba(247, 244, 239, 0.6);
}

.footer-cta { margin-top: 22px; }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.footer-title {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--c-gold);
  padding-bottom: 10px;
  margin-bottom: 16px;
  border-bottom: 1px solid rgba(201, 169, 110, 0.28);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 11px;
  font-size: 14px;
  line-height: 1.7;
}

.footer-link {
  position: relative;
  display: inline-block;
  color: rgba(247, 244, 239, 0.78);
  transition: color 0.24s var(--ease);
}

.footer-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background-color: var(--c-gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.34s var(--ease);
}

.footer-link:hover,
.footer-link:focus-visible { color: var(--c-porcelain); }

.footer-link:hover::after,
.footer-link:focus-visible::after { transform: scaleX(1); }

.footer-contact { gap: 16px; }

.footer-contact-item {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(247, 244, 239, 0.72);
  word-break: break-word;
}

.footer-contact-item .mono { color: var(--c-gold-light); }

.footer-contact-key {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-gold);
  margin-bottom: 2px;
}

.footer-note {
  margin-top: clamp(28px, 3.5vw, 40px);
  padding-top: 20px;
  border-top: 1px solid rgba(201, 169, 110, 0.2);
  font-size: 13px;
  line-height: 1.9;
  color: rgba(247, 244, 239, 0.55);
  max-width: 56em;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid rgba(201, 169, 110, 0.2);
}

.footer-legal {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(247, 244, 239, 0.55);
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border: 1px solid rgba(201, 169, 110, 0.45);
  color: var(--c-gold-light);
  font-size: 12px;
  letter-spacing: 0.16em;
  transition: background-color 0.24s var(--ease), color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.to-top:hover {
  background-color: var(--c-red);
  border-color: var(--c-red);
  color: var(--c-white);
}

.to-top-arrow { font-family: var(--font-mono); font-size: 13px; line-height: 1; }

/* ---------- 8. 通用组件 ---------- */
/* 8.1 面包屑 */
.breadcrumb { padding-top: 20px; }

.crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-blueprint);
}

.crumb-item { display: flex; align-items: center; }

.crumb-item + .crumb-item::before {
  content: "／";
  margin: 0 8px;
  color: var(--c-gold);
}

.crumb-link { color: var(--c-blueprint); transition: color 0.24s var(--ease); }
.crumb-link:hover { color: var(--c-red); }

/* 8.2 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  font-size: 14px;
  letter-spacing: 0.12em;
  border: 1px solid transparent;
  background-color: transparent;
  text-align: center;
  transition: background-color 0.24s var(--ease), color 0.24s var(--ease),
              border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background-color: var(--c-red);
  border-color: var(--c-red);
  color: var(--c-white);
}

.btn-primary:hover {
  background-color: var(--c-red-deep);
  border-color: var(--c-red-deep);
}

.btn-outline {
  border-color: var(--c-ink);
  color: var(--c-ink);
}

.btn-outline:hover {
  background-color: var(--c-ink);
  color: var(--c-porcelain);
}

.btn-gold {
  border-color: var(--c-gold);
  color: var(--c-gold-light);
}

.btn-gold:hover {
  background-color: var(--c-gold);
  border-color: var(--c-gold);
  color: var(--c-ink);
}

/* 8.3 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.1em;
  border: 1px solid currentColor;
  white-space: nowrap;
}

.tag-jade { color: var(--c-jade); background-color: var(--c-jade-light); border-color: rgba(58, 125, 107, 0.35); }
.tag-amber { color: var(--c-amber); background-color: rgba(184, 116, 26, 0.1); border-color: rgba(184, 116, 26, 0.36); }
.tag-red { color: var(--c-red-deep); background-color: rgba(200, 16, 46, 0.08); border-color: rgba(200, 16, 46, 0.32); }
.tag-gold { color: #8A6E33; background-color: rgba(201, 169, 110, 0.18); border-color: rgba(201, 169, 110, 0.55); }
.tag-ink { color: var(--c-porcelain); background-color: var(--c-ink); border-color: var(--c-ink); }

/* 8.4 章节头 */
.sec-head {
  position: relative;
  padding-top: 22px;
  margin-bottom: clamp(24px, 3vw, 40px);
  border-top: 1px solid var(--c-gold);
}

.sec-head::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 56px;
  height: 2px;
  background-color: var(--c-red);
}

.sec-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-gold);
  margin-bottom: 10px;
}

.sec-title { margin-bottom: 10px; }

.sec-sub {
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-graphite);
  max-width: 34em;
}

/* 8.5 卡片 */
.card {
  position: relative;
  background-color: var(--c-white);
  border: 1px solid var(--c-gold-light);
  padding: clamp(20px, 2.4vw, 30px);
  box-shadow: var(--shadow-paper);
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.card:hover {
  border-color: var(--c-gold);
  box-shadow: var(--shadow-lift);
}

.card-title {
  font-family: var(--font-serif);
  font-size: 20px;
  letter-spacing: 0.05em;
  margin-bottom: 10px;
}

.card-meta {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-blueprint);
  margin-bottom: 10px;
}

.card-body {
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-graphite);
}

/* 8.6 图片容器 */
.frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--c-gold-light);
  background-image: linear-gradient(135deg, var(--c-gold-light) 0%, #F1EAE0 55%, #EDE4D6 100%);
}

.frame > img,
.frame > svg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.frame-21x9 { aspect-ratio: 21 / 9; }
.frame-16x9 { aspect-ratio: 16 / 9; }
.frame-4x3 { aspect-ratio: 4 / 3; }
.frame-1x1 { aspect-ratio: 1 / 1; }
.frame-3x4 { aspect-ratio: 3 / 4; }

.frame-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.08em;
  color: var(--c-blueprint);
}

.frame-tag {
  position: absolute;
  left: 12px;
  top: 12px;
  z-index: 2;
}

/* 8.7 数据带 */
.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  background-color: var(--c-gold-light);
  border: 1px solid var(--c-gold-light);
}

.stat {
  flex: 1 1 168px;
  min-width: 0;
  background-color: var(--c-porcelain);
  padding: 20px 22px;
  transition: background-color 0.3s var(--ease);
}

.stat:hover { background-color: var(--c-white); }

.stat-value {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1.2;
  color: var(--c-red);
  letter-spacing: 0.02em;
}

.stat-label {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-blueprint);
}

/* 8.8 时间线 */
.timeline {
  position: relative;
  padding-left: 28px;
  border-left: 1px solid var(--c-gold);
}

.tl-item {
  position: relative;
  padding-bottom: 34px;
}

.tl-item:last-child { padding-bottom: 0; }

.tl-item::before {
  content: "";
  position: absolute;
  left: -34.5px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background-color: var(--c-porcelain);
  border: 2px solid var(--c-gold);
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.tl-item:hover::before {
  border-color: var(--c-red);
  background-color: var(--c-red);
}

.tl-date {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-blueprint);
}

.tl-title {
  font-family: var(--font-serif);
  font-size: 19px;
  letter-spacing: 0.04em;
  margin: 8px 0 8px;
}

.tl-body {
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-graphite);
  max-width: 34em;
}

/* 8.9 对照表 */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--c-gold-light);
  background-color: var(--c-white);
}

.data-table {
  min-width: 660px;
  font-size: 14px;
  line-height: 1.8;
}

.data-table caption {
  text-align: left;
  padding: 14px 16px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-blueprint);
  border-bottom: 1px solid var(--c-gold-light);
}

.data-table th,
.data-table td {
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--c-line-soft);
}

.data-table thead th {
  background-color: var(--c-ink);
  color: var(--c-porcelain);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  border-bottom: 2px solid var(--c-red);
  border-top: 0;
}

.data-table tbody tr:nth-child(even) { background-color: rgba(230, 214, 184, 0.24); }
.data-table tbody tr:hover { background-color: rgba(201, 169, 110, 0.18); }
.data-table tbody tr:last-child th,
.data-table tbody tr:last-child td { border-bottom: 0; }
.data-table td + td,
.data-table th + th { border-left: 1px solid var(--c-line-soft); }

/* 8.10 折叠面板 */
.accordion { border-top: 1px solid var(--c-gold-light); }

.acc-item { border-bottom: 1px solid var(--c-gold-light); }

.acc-head { margin: 0; font-weight: 400; }

.acc-trigger {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 18px 4px;
  text-align: left;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-ink);
  transition: color 0.24s var(--ease), padding-left 0.3s var(--ease);
}

.acc-trigger:hover { color: var(--c-red-deep); padding-left: 10px; }

.acc-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-gold);
  flex: none;
  transition: color 0.24s var(--ease);
}

.acc-trigger[aria-expanded="true"] .acc-num { color: var(--c-red); }

.acc-icon {
  position: relative;
  margin-left: auto;
  width: 14px;
  height: 14px;
  flex: none;
  color: var(--c-ink);
}

.acc-icon::before,
.acc-icon::after {
  content: "";
  position: absolute;
  background-color: currentColor;
  transition: transform 0.3s var(--ease), opacity 0.3s linear, background-color 0.24s var(--ease);
}

.acc-icon::before { left: 0; top: 6.25px; width: 14px; height: 1.5px; }
.acc-icon::after { left: 6.25px; top: 0; width: 1.5px; height: 14px; }

.acc-trigger:hover .acc-icon { color: var(--c-red); }
.acc-trigger[aria-expanded="true"] .acc-icon { color: var(--c-red); }
.acc-trigger[aria-expanded="true"] .acc-icon::after { transform: scaleY(0); opacity: 0; }

.acc-panel {
  height: 0;
  overflow: hidden;
  transition: height 0.34s var(--ease);
}

.acc-inner {
  padding: 0 4px 24px;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-graphite);
}

/* 8.11 步骤 */
.steps { counter-reset: step; }

.step {
  position: relative;
  margin-left: 17px;
  padding: 18px 0 18px 40px;
  border-left: 1px solid var(--c-gold-light);
}

.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: -17px;
  top: 18px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  background-color: var(--c-porcelain);
  border: 1px solid var(--c-gold);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-red-deep);
  transition: border-color 0.28s var(--ease), color 0.28s var(--ease);
}

.step:hover::before { border-color: var(--c-red); color: var(--c-red); }

.step-title {
  font-family: var(--font-serif);
  font-size: 17px;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}

.step-body {
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-graphite);
  max-width: 34em;
}

/* 8.12 提示块 */
.callout {
  position: relative;
  padding: 18px 20px 18px 22px;
  background-color: var(--c-white);
  border: 1px solid var(--c-gold-light);
  border-left-width: 3px;
  border-left-color: var(--c-red);
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-graphite);
}

.callout-jade { border-left-color: var(--c-jade); background-color: rgba(220, 234, 229, 0.5); }
.callout-amber { border-left-color: var(--c-amber); background-color: rgba(184, 116, 26, 0.07); }

.callout-title {
  font-family: var(--font-serif);
  font-size: 16px;
  letter-spacing: 0.05em;
  color: var(--c-ink);
  margin-bottom: 6px;
}

/* 8.13 术语悬浮提示 */
.hint {
  position: relative;
  display: inline-block;
  border-bottom: 1px dashed var(--c-blueprint);
  cursor: help;
}

.hint-pop {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  transform: translateX(-50%) translateY(4px);
  z-index: 30;
  width: max-content;
  max-width: 240px;
  padding: 8px 12px;
  background-color: var(--c-ink);
  color: var(--c-porcelain);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease), visibility 0.22s linear;
}

.hint:hover .hint-pop,
.hint:focus-within .hint-pop {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* 8.14 滚动显现 */
.reveal.is-armed {
  opacity: 0;
  transform: translateY(16px);
}

.reveal.is-armed.is-in {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

/* ---------- 9. 响应式 ---------- */
@media (min-width: 900px) {
  .site-header { position: sticky; top: 0; }
}

@media (max-width: 1100px) {
  .grid { gap: 20px; }
}

@media (max-width: 899px) {
  html { scroll-padding-top: 90px; }

  .mast-top {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 10px;
    padding-top: 20px;
    padding-bottom: 10px;
  }

  .mast-brand { grid-column: auto; padding: 0; }
  .mast-brand-name { font-size: clamp(22px, 6.4vw, 28px); letter-spacing: 0.18em; text-indent: 0.18em; }
  .mast-brand-sub { font-size: 11px; letter-spacing: 0.2em; text-indent: 0.2em; }
  .mast-meta-left { justify-self: center; }
  .mast-meta-right { justify-self: center; }

  .nav-toggle { display: flex; }

  .mast-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    padding-top: 0;
    background-color: var(--c-porcelain);
    border-bottom: 1px solid var(--c-gold);
    box-shadow: 0 20px 34px rgba(26, 26, 26, 0.14);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height 0.38s var(--ease), visibility 0.38s linear;
  }

  .mast-nav[data-open] {
    max-height: 78vh;
    overflow-y: auto;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 14px;
  }

  .nav-item { display: block; border-bottom: 1px solid var(--c-line-soft); }
  .nav-item:last-child { border-bottom: 0; }

  .nav-link {
    display: flex;
    width: 100%;
    align-items: center;
    justify-content: space-between;
    padding: 16px 6px;
    font-size: 16px;
  }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] {
    background-image: linear-gradient(90deg, rgba(230, 214, 184, 0.75), rgba(230, 214, 184, 0));
    box-shadow: inset 3px 0 0 var(--c-red);
    padding-left: 14px;
  }

  .nav-idx {
    order: 2;
    margin-left: auto;
    transform: none;
    font-size: 11px;
  }

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

  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 16px; }
  .span-1, .span-2, .span-3 { grid-column: span 2; }
  .span-4, .span-5, .span-6 { grid-column: span 3; }
  .span-7, .span-8, .span-9, .span-10, .span-11, .span-12 { grid-column: 1 / -1; }

  .footer-top { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-1, .span-2, .span-3, .span-4, .span-5, .span-6 { grid-column: 1 / -1; }

  .footer-cols { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .to-top { align-self: stretch; justify-content: center; }

  .stat { flex: 1 1 100%; }
  .acc-trigger { font-size: 16px; gap: 12px; }
}

/* ---------- 10. 动效降级 ---------- */
@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;
    transition-delay: 0ms !important;
  }

  .reveal.is-armed {
    opacity: 1;
    transform: none;
  }
}