:root {
  --paper: #f4efe4;
  --paper-strong: #fffaf0;
  --ink: #1f2430;
  --ink-soft: #515a6f;
  --line: rgba(31, 36, 48, 0.12);
  --shadow: 0 24px 80px rgba(36, 31, 20, 0.12);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --max-width: 1360px;
  --serif: "STZhongsong", "Songti SC", "Noto Serif SC", "Source Han Serif SC",
    Georgia, serif;
  --sans: "Segoe UI Variable", "PingFang SC", "Microsoft YaHei UI",
    "Hiragino Sans GB", sans-serif;
  --accent-gold: #8e6a28;
  --accent-crimson: #8d3c31;
  --accent-ink: #275569;
  --accent-forest: #315a40;
  --accent-copper: #8c4f28;
  --accent-plum: #694667;
  --accent-slate: #556171;
  --accent-teal: #256267;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(141, 60, 49, 0.15), transparent 28%),
    radial-gradient(circle at 85% 15%, rgba(39, 85, 105, 0.18), transparent 20%),
    linear-gradient(180deg, #f9f2e6 0%, #f3eddf 100%);
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(31, 36, 48, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 36, 48, 0.025) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6), transparent 95%);
}

.ambient {
  position: fixed;
  pointer-events: none;
  inset: auto;
  border-radius: 999px;
  filter: blur(80px);
  opacity: 0.45;
}

.ambient-a {
  top: 10vh;
  left: -6rem;
  width: 16rem;
  height: 16rem;
  background: rgba(141, 60, 49, 0.2);
}

.ambient-b {
  right: -4rem;
  bottom: 12vh;
  width: 18rem;
  height: 18rem;
  background: rgba(39, 85, 105, 0.16);
}

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

.masthead {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 0;
  display: grid;
  gap: 1.25rem;
  position: relative;
  z-index: 1;
}

.brand-cluster,
.masthead-nav,
.search-shell,
.hero-card,
.article-card,
.panel {
  background: rgba(255, 250, 240, 0.82);
  border: 1px solid rgba(31, 36, 48, 0.08);
  box-shadow: var(--shadow);
}

.brand-cluster {
  border-radius: var(--radius-xl);
  padding: 1.2rem 1.4rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

.brand-mark {
  font-family: var(--serif);
  font-size: clamp(1.75rem, 2vw, 2.4rem);
  letter-spacing: 0.08em;
}

.brand-note {
  margin: 0;
  max-width: 36rem;
  color: var(--ink-soft);
  line-height: 1.65;
}

.masthead-nav {
  border-radius: 999px;
  padding: 0.65rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

.nav-link {
  padding: 0.7rem 1rem;
  border-radius: 999px;
  color: var(--ink-soft);
  transition: transform 180ms ease, background-color 180ms ease, color 180ms ease;
}

.nav-link:hover,
.nav-link.active {
  background: rgba(31, 36, 48, 0.08);
  color: var(--ink);
  transform: translateY(-1px);
}

.search-shell {
  border-radius: var(--radius-lg);
  padding: 1rem 1.1rem;
  position: relative;
}

.search-label {
  display: block;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 0.55rem;
}

.search-input {
  width: 100%;
  border: 1px solid rgba(31, 36, 48, 0.12);
  border-radius: 14px;
  padding: 0.95rem 1rem;
  background: rgba(255, 255, 255, 0.72);
  font: inherit;
}

.search-input:focus {
  outline: 2px solid rgba(39, 85, 105, 0.18);
  border-color: rgba(39, 85, 105, 0.35);
}

.search-results {
  position: absolute;
  left: 1rem;
  right: 1rem;
  top: calc(100% - 0.2rem);
  background: rgba(255, 250, 240, 0.98);
  border: 1px solid rgba(31, 36, 48, 0.12);
  border-radius: 18px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.search-result {
  display: grid;
  gap: 0.3rem;
  padding: 0.95rem 1rem;
  border-bottom: 1px solid rgba(31, 36, 48, 0.08);
}

.search-result:last-child {
  border-bottom: 0;
}

.search-result:hover {
  background: rgba(39, 85, 105, 0.06);
}

.search-result-meta {
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.page-shell {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 1.5rem 4rem;
  display: grid;
  gap: 1.5rem;
}

.hero-card {
  border-radius: 34px;
  padding: 1.6rem;
  overflow: hidden;
  position: relative;
}

.hero-card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.2), transparent 40%),
    radial-gradient(circle at top right, rgba(255, 255, 255, 0.3), transparent 30%);
}

.hero-grid {
  display: grid;
  gap: 1rem;
  position: relative;
  z-index: 1;
}

.hero-grid-home {
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.8fr);
  gap: 1.4rem;
  align-items: stretch;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
  color: rgba(31, 36, 48, 0.7);
}

.hero-card h1 {
  margin: 0.15rem 0 0;
  font-family: var(--serif);
  font-size: clamp(2.2rem, 4vw, 4rem);
  line-height: 1.02;
}

.hero-summary {
  margin: 0.75rem 0 0;
  max-width: 54rem;
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.hero-home .hero-summary {
  max-width: 44rem;
  font-size: 1.08rem;
}

.hero-home-card {
  border-radius: 28px;
  border: 1px solid rgba(31, 36, 48, 0.08);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.82), rgba(255, 255, 255, 0.58));
  padding: 1.3rem 1.2rem;
  display: grid;
  gap: 1rem;
  align-content: start;
}

.hero-home-note {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
}

.hero-sequence {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.7rem;
  line-height: 1.7;
}

.home-cta-row {
  margin-top: 1.2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.cta-primary,
.cta-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.8rem 1.15rem;
  border-radius: 999px;
  border: 1px solid rgba(31, 36, 48, 0.12);
  transition: transform 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

.cta-primary {
  background: #1f2430;
  color: #fff8ef;
  box-shadow: 0 14px 32px rgba(31, 36, 48, 0.16);
}

.cta-secondary {
  background: rgba(255, 255, 255, 0.62);
  color: var(--ink);
}

.cta-primary:hover,
.cta-secondary:hover {
  transform: translateY(-2px);
}

.hero-aside {
  display: grid;
  gap: 0.85rem;
  align-content: start;
}

.breadcrumb-row,
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: center;
}

.breadcrumb-link,
.meta-chip,
.tag-chip,
.missing-link {
  border: 1px solid rgba(31, 36, 48, 0.12);
  background: rgba(255, 255, 255, 0.55);
  border-radius: 999px;
  padding: 0.42rem 0.8rem;
  font-size: 0.88rem;
}

.breadcrumb-sep {
  color: rgba(31, 36, 48, 0.4);
}

.hero-path {
  margin: 0;
  color: rgba(31, 36, 48, 0.58);
  font-size: 0.92rem;
}

.dashboard-grid,
.content-grid {
  display: grid;
  gap: 1.5rem;
}

.dashboard-grid {
  grid-template-columns: 1.05fr 1fr;
}

.dashboard-grid-home {
  grid-template-columns: 1fr;
}

.dashboard-grid .atlas-panel,
.dashboard-grid .ledger-panel {
  grid-column: span 1;
}

.panel,
.article-card {
  border-radius: var(--radius-xl);
  padding: 1.3rem 1.25rem;
}

.panel-heading {
  font-family: var(--serif);
  font-size: 1.15rem;
  margin-bottom: 1rem;
}

.panel-copy {
  margin: 1rem 0 0;
  color: var(--ink-soft);
  line-height: 1.8;
}

.metric-grid,
.feature-grid,
.category-grid {
  display: grid;
  gap: 0.9rem;
}

.metric-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.metric-tile,
.feature-card,
.category-card,
.compact-link,
.sidebar-link {
  border-radius: 20px;
  border: 1px solid rgba(31, 36, 48, 0.1);
  background: rgba(255, 255, 255, 0.6);
  padding: 1rem;
  transition: transform 180ms ease, border-color 180ms ease, background-color 180ms ease;
}

.metric-tile {
  display: grid;
  gap: 0.25rem;
}

.metric-value {
  font-family: var(--serif);
  font-size: 2rem;
}

.metric-label,
.feature-type,
.sidebar-link-type,
.compact-meta {
  color: var(--ink-soft);
  font-size: 0.84rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.feature-grid,
.category-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.feature-grid-wide {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card,
.category-card,
.compact-link,
.sidebar-link {
  display: grid;
  gap: 0.45rem;
}

.feature-card:hover,
.category-card:hover,
.compact-link:hover,
.sidebar-link:hover {
  transform: translateY(-2px);
  border-color: rgba(31, 36, 48, 0.2);
  background: rgba(255, 255, 255, 0.82);
}

.compact-list,
.sidebar-list,
.toc {
  display: grid;
  gap: 0.7rem;
}

.content-grid {
  grid-template-columns: minmax(0, 1.9fr) minmax(280px, 0.85fr);
  align-items: start;
}

.sidebar {
  display: grid;
  gap: 1rem;
  position: sticky;
  top: 15rem;
}

.toc-link {
  color: var(--ink-soft);
  padding: 0.2rem 0;
}

.toc-link.level-3 {
  padding-left: 1rem;
  font-size: 0.94rem;
}

.prose {
  line-height: 1.86;
  font-size: 1rem;
}

.prose > :first-child {
  margin-top: 0;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
  font-family: var(--serif);
  line-height: 1.18;
  scroll-margin-top: 14rem;
}

.prose h2 {
  margin-top: 2.4rem;
  font-size: 1.9rem;
}

.prose h3 {
  margin-top: 1.8rem;
  font-size: 1.4rem;
}

.prose p,
.prose li,
.prose blockquote {
  color: #2d3444;
}

.prose ul,
.prose ol {
  padding-left: 1.35rem;
}

.prose li + li {
  margin-top: 0.35rem;
}

.prose blockquote {
  margin: 1.4rem 0;
  padding: 1rem 1.15rem;
  border-left: 4px solid rgba(39, 85, 105, 0.32);
  background: rgba(39, 85, 105, 0.07);
  border-radius: 0 18px 18px 0;
}

.prose code {
  background: rgba(31, 36, 48, 0.08);
  padding: 0.18rem 0.42rem;
  border-radius: 8px;
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 0.92em;
}

.code-block {
  overflow: auto;
  border-radius: 20px;
  background: #1d2230;
  color: #f9f3e7;
  padding: 1rem;
}

.table-wrap {
  overflow: auto;
  margin: 1.5rem 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  min-width: 540px;
}

.prose th,
.prose td {
  padding: 0.85rem;
  text-align: left;
  border-bottom: 1px solid rgba(31, 36, 48, 0.12);
}

.prose th {
  font-family: var(--serif);
}

.section-rule {
  border: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(31, 36, 48, 0.2), transparent);
  margin: 2rem 0;
}

.wiki-link {
  color: var(--accent-ink);
  border-bottom: 1px solid rgba(39, 85, 105, 0.28);
}

.broken-link {
  color: var(--accent-crimson);
  border-bottom: 1px dashed rgba(141, 60, 49, 0.4);
}

.missing-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.accent-gold {
  --accent-current: var(--accent-gold);
}

.accent-crimson {
  --accent-current: var(--accent-crimson);
}

.accent-ink {
  --accent-current: var(--accent-ink);
}

.accent-forest {
  --accent-current: var(--accent-forest);
}

.accent-copper {
  --accent-current: var(--accent-copper);
}

.accent-plum {
  --accent-current: var(--accent-plum);
}

.accent-slate {
  --accent-current: var(--accent-slate);
}

.accent-teal {
  --accent-current: var(--accent-teal);
}

.hero-card[class*="accent-"] {
  border-color: color-mix(in srgb, var(--accent-current) 24%, transparent);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.78), rgba(255, 255, 255, 0.55)),
    linear-gradient(
      135deg,
      color-mix(in srgb, var(--accent-current) 22%, transparent),
      transparent 45%
    );
}

@media (max-width: 1080px) {
  .hero-grid-home,
  .dashboard-grid,
  .content-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

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

@media (max-width: 720px) {
  .masthead,
  .page-shell {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .hero-card,
  .article-card,
  .panel {
    border-radius: 22px;
  }

  .feature-grid,
  .feature-grid-wide,
  .category-grid,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .hero-card h1 {
    font-size: 2.3rem;
  }
}

/* ── 折叠侧边栏面板 ── */
details.panel {
  border-radius: var(--radius-xl);
  padding: 0;
  overflow: hidden;
}

details.panel > summary.panel-heading {
  list-style: none;
  padding: 1rem 1.25rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0;
  font-family: var(--serif);
  font-size: 1.05rem;
  user-select: none;
}

details.panel > summary.panel-heading::after {
  content: "›";
  font-size: 1.2rem;
  color: var(--ink-soft);
  transition: transform 180ms ease;
  transform: rotate(90deg);
}

details.panel[open] > summary.panel-heading::after {
  transform: rotate(-90deg);
}

details.panel > summary::-webkit-details-marker {
  display: none;
}

details.panel > .sidebar-list {
  padding: 0 1.25rem 1rem;
}

/* ── 页面翻页导航 ── */
.page-pager {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0.75rem;
  align-items: center;
  padding: 1.25rem;
  background: rgba(255, 250, 240, 0.82);
  border: 1px solid rgba(31, 36, 48, 0.08);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.pager-link {
  display: grid;
  gap: 0.3rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(31, 36, 48, 0.1);
  background: rgba(255, 255, 255, 0.6);
  transition: transform 180ms ease, background-color 180ms ease;
}

.pager-link:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.88);
}

.pager-prev { text-align: left; }
.pager-next { text-align: right; justify-self: end; width: 100%; }

.pager-dir {
  font-size: 0.82rem;
  color: var(--ink-soft);
  letter-spacing: 0.05em;
}

.pager-title {
  font-weight: 600;
  font-size: 0.95rem;
}

.pager-placeholder {
  display: block;
}

.pager-index {
  text-align: center;
  font-size: 0.88rem;
  color: var(--ink-soft);
  white-space: nowrap;
  padding: 0.5rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(31, 36, 48, 0.1);
  background: rgba(255, 255, 255, 0.6);
  transition: background-color 180ms ease;
}

.pager-index:hover {
  background: rgba(255, 255, 255, 0.88);
  color: var(--ink);
}

/* ── 分类总览页目录 ── */
.section-index {
  background: rgba(255, 250, 240, 0.82);
  border: 1px solid rgba(31, 36, 48, 0.08);
  border-radius: var(--radius-xl);
  padding: 1.5rem 1.25rem;
  box-shadow: var(--shadow);
  display: grid;
  gap: 2rem;
}

.section-group {
  display: grid;
  gap: 0.75rem;
}

.section-group-heading {
  font-family: var(--serif);
  font-size: 1.1rem;
  margin: 0;
  color: var(--ink-soft);
  border-bottom: 1px solid rgba(31, 36, 48, 0.08);
  padding-bottom: 0.4rem;
}

@media (max-width: 720px) {
  .page-pager {
    grid-template-columns: 1fr;
  }

  .pager-next {
    justify-self: start;
    width: auto;
    text-align: left;
  }

  .pager-index {
    justify-self: start;
  }
}

/* ── 搜索分类 chips ── */
.search-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.6rem 0 0.2rem;
}

.search-chip {
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(31, 36, 48, 0.14);
  background: rgba(255, 255, 255, 0.6);
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
  transition: background-color 150ms ease, border-color 150ms ease;
}

.search-chip:hover {
  background: rgba(255, 255, 255, 0.88);
}

.search-chip.active {
  background: #1f2430;
  color: #fff8ef;
  border-color: transparent;
}

.search-group {
  border-bottom: 1px solid rgba(31, 36, 48, 0.08);
  padding-bottom: 0.25rem;
  margin-bottom: 0.25rem;
}

.search-group:last-child {
  border-bottom: 0;
  margin-bottom: 0;
}

.search-group-label {
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  padding: 0.55rem 1rem 0.2rem;
}

/* ── 首页 section ── */
.home-section {
  display: grid;
  gap: 1.25rem;
}

.home-section-label {
  font-family: var(--serif);
  font-size: 1.15rem;
}

/* ── 步骤卡片 ── */
.step-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.9rem;
}

.step-card {
  display: grid;
  gap: 0.5rem;
  padding: 1.1rem 1rem;
  border-radius: 20px;
  border: 1px solid rgba(31, 36, 48, 0.1);
  background: rgba(255, 255, 255, 0.6);
  transition: transform 180ms ease, background-color 180ms ease;
  align-content: start;
}

.step-card:hover {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, 0.88);
}

.step-card[class*="accent-"] {
  border-color: color-mix(in srgb, var(--accent-current) 20%, transparent);
  background: linear-gradient(
    145deg,
    color-mix(in srgb, var(--accent-current) 10%, rgba(255, 255, 255, 0.82)),
    rgba(255, 255, 255, 0.6)
  );
}

.step-num {
  font-family: var(--serif);
  font-size: 1.6rem;
  line-height: 1;
  color: color-mix(in srgb, var(--accent-current, var(--ink-soft)) 60%, transparent);
}

.step-label {
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.step-title {
  font-size: 0.97rem;
  line-height: 1.35;
}

.step-summary {
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 首页 hero 简化版 */
.hero-home .hero-copy {
  max-width: 54rem;
}

@media (max-width: 1080px) {
  .step-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .step-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}