:root {
  /*
    前端视觉主题已定稿，不需修改。
    只有当用户明确输入“需要修改”时，才允许调整颜色、字号、间距或布局。
  */
  color-scheme: light;
  --bg: #f6efe6;
  --surface: #fffdf8;
  --surface-strong: #ffffff;
  --text: #24313d;
  --muted: #6b7480;
  --accent: #aa6b2e;
  --accent-strong: #4d6983;
  --accent-soft: rgba(170, 107, 46, 0.12);
  --border: #e8e0d2;
  --shadow: 0 20px 45px rgba(73, 58, 35, 0.12);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  background: linear-gradient(180deg, #f9f5ec 0%, #f2ebde 100%);
  color: var(--text);
  line-height: 1.7;
}

.page-shell {
  /* 页面基础骨架：负责让页脚稳定停在页面底部。前端定稿，不需修改。 */
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  /* 顶部导航栏：品牌、栏目数量、中英文切换。前端定稿，不需修改。 */
  background: rgba(255, 253, 248, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-header__inner {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.14em;
  color: var(--accent-strong);
  text-decoration: none;
}

.site-nav,
.language-switch {
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.site-nav a,
.language-switch a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease;
}

.site-nav a:hover,
.language-switch a:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.site-main {
  /* 主内容区外边距：所有页面共用。前端定稿，不需修改。 */
  flex: 1;
  padding: 2rem 0 3rem;
}

.content-surface {
  padding: 0.2rem 0;
}

.page-card,
.home-shell {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 26px;
  box-shadow: var(--shadow);
  padding: 1.4rem;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 0.6rem;
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}

h1, h2, h3 {
  line-height: 1.25;
  color: var(--accent-strong);
}

.summary {
  font-size: 1.03rem;
  color: var(--muted);
  margin-bottom: 1.25rem;
}

.home-hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.2rem;
  align-items: start;
}

.home-highlight,
.home-card {
  background: linear-gradient(135deg, rgba(255,255,255,0.95), rgba(248,241,230,0.92));
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.1rem 1.2rem;
}

.home-highlight ul,
.home-list {
  padding-left: 1.1rem;
  margin: 0.5rem 0 0;
  color: var(--muted);
}

.home-highlight li,
.home-list li {
  margin-bottom: 0.45rem;
}

.home-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.home-link {
  display: inline-block;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  text-decoration: none;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

.home-link.secondary {
  background: transparent;
  color: var(--accent-strong);
  border: 1px solid var(--border);
}

.home-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.home-grid.secondary {
  grid-template-columns: 1.15fr 0.85fr;
  margin-top: 1rem;
}

.home-card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.home-card h2 {
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
}

.home-card p {
  margin: 0;
  color: var(--muted);
}

.home-card a {
  color: var(--accent-strong);
  text-decoration: none;
  font-weight: 700;
}

.home-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: 1rem;
}

.metric-tile {
  background: rgba(255,255,255,0.78);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 0.8rem 0.9rem;
}

.metric-tile strong {
  display: block;
  font-size: 1rem;
  color: var(--accent-strong);
}

.metric-tile span {
  color: var(--muted);
  font-size: 0.92rem;
}

.home-full {
  margin-top: 1rem;
}

.home-layout {
  /* 首页左右两栏：左侧最新文章，右侧研究框架和 WIKI 最近更新。前端定稿，不需修改。 */
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: 1.1rem;
  align-items: start;
}

.home-feed,
.home-sidebar-panel {
  /* 首页面板样式：保持 Blog 风格和右侧信息区统一。前端定稿，不需修改。 */
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: var(--shadow);
}

.home-feed {
  padding: 1.5rem;
}

.home-sidebar {
  display: grid;
  gap: 1rem;
}

.home-sidebar-panel {
  padding: 1.2rem;
}

.home-section-head {
  display: grid;
  gap: 0.3rem;
  margin-bottom: 1rem;
}

.home-section-head h1,
.home-section-head h2 {
  margin: 0;
}

.home-section-head p {
  margin: 0;
  color: var(--muted);
}

.blog-post {
  /* 首页文章卡片：只显示文章标题、摘要、节选和阅读全文。前端定稿，不需修改。 */
  display: grid;
  gap: 0.75rem;
  padding: 1.05rem 0;
  border-top: 1px solid var(--border);
}

.blog-post:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.blog-post h2 {
  margin: 0;
  font-size: 1.45rem;
}

.blog-post h2 a,
.update-list a {
  color: var(--accent-strong);
  text-decoration: none;
}

.blog-post__meta {
  margin: 0;
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.blog-post__summary {
  margin: 0;
  color: var(--muted);
}

.blog-post__excerpt {
  margin: 0;
  color: var(--text);
}

.blog-post__link {
  justify-self: start;
  color: var(--accent);
  text-decoration: none;
  font-weight: 800;
}

.framework-list,
.update-list {
  /* 首页右侧列表：研究框架和 WIKI 最近更新。前端定稿，不需修改。 */
  list-style: none;
  margin: 0.8rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.framework-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.65rem;
  align-items: start;
}

.framework-list strong {
  color: var(--accent-strong);
}

.framework-list span {
  width: 1.75rem;
  height: 1.75rem;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 800;
}

.framework-list p,
.update-list p {
  margin: 0.08rem 0 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.update-list li {
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.update-list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.article-body, .wiki-body, .example-body, .implementation-body {
  /* 正文排版入口：Markdown 渲染后的文章和 Wiki 内容。前端定稿，不需修改。 */
  color: var(--text);
}

.article-body pre,
.wiki-body pre,
.example-body pre,
.implementation-body pre {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
  overflow-x: auto;
}

.article-body code,
.wiki-body code,
.example-body code,
.implementation-body code {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.article-body p,
.wiki-body p,
.example-body p,
.implementation-body p {
  margin: 0 0 1rem;
}

.article-body h1,
.wiki-body h1,
.example-body h1,
.implementation-body h1,
.article-body h2,
.wiki-body h2,
.example-body h2,
.implementation-body h2 {
  margin-top: 1.5rem;
}

.content-layout {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.35fr);
  gap: 1rem;
  align-items: start;
}

.content-main.page-card {
  max-width: none;
}

.section-shell {
  display: grid;
  gap: 1rem;
  max-width: 660px;
  margin: 0 auto;
}

.content-main.page-card {
  min-width: 0;
}

.content-sidebar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: var(--shadow);
  padding: 1.2rem;
  position: sticky;
  top: 5.5rem;
  min-height: 220px;
}

.content-sidebar h2 {
  margin: 0 0 0.8rem;
  font-size: 1.1rem;
}

.content-sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.65rem;
}

.content-sidebar li {
  padding-top: 0.65rem;
  border-top: 1px solid var(--border);
}

.content-sidebar li:first-child {
  padding-top: 0;
  border-top: 0;
}

.content-sidebar a {
  color: var(--accent-strong);
  text-decoration: none;
  font-weight: 800;
}

.content-sidebar p {
  margin: 0;
  color: var(--muted);
}

.related-panel,
.wiki-links,
.implementation-links {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.content-sidebar.related-panel {
  margin-top: 0;
  padding-top: 1.2rem;
}

.site-footer {
  /* 页脚免责声明和联系方式：法律声明字体已缩小。前端定稿，不需修改。 */
  padding: 1rem 0 2rem;
  color: var(--muted);
}

.site-footer__inner {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.2rem 1.2rem 0;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1.2fr 0.4fr;
  gap: 1rem;
  align-items: start;
}

.site-footer__title {
  margin: 0 0 0.35rem;
  font-weight: 700;
  color: var(--accent-strong);
}

.site-footer__statement p,
.site-footer__contact p {
  margin: 0;
  font-size: 0.95rem;
}

.site-footer__statement p {
  font-size: 0.78rem;
  line-height: 1.55;
}

.site-footer__statement .site-footer__title {
  font-size: 0.86rem;
}

.site-footer__contact a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
}

.timeline-list {
  list-style: none;
  padding: 0;
  margin: 0.6rem 0 0;
  display: grid;
  gap: 0.7rem;
}

.timeline-list li {
  display: grid;
  gap: 0.15rem;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(255,255,255,0.75);
}

.timeline-list time {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 700;
}

.timeline-list a {
  color: var(--accent-strong);
  font-weight: 700;
  text-decoration: none;
}

.timeline-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.section-shell {
  display: grid;
  gap: 1rem;
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
}

.content-card {
  background: rgba(255,255,255,0.94);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 0.75rem 0.9rem;
  min-height: 90px;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  box-shadow: 0 5px 16px rgba(73, 58, 35, 0.08);
}

.content-card h2 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.3;
}

.content-card h2 a {
  color: var(--accent-strong);
  text-decoration: none;
}

.content-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.4;
  white-space: pre-line;
}

.content-card p.card-summary {
  display: block;
}

.card-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
  margin-top: auto;
}

.article-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0.15rem 0 1.1rem;
}

.stats-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.75);
  color: var(--accent-strong);
  font-size: 0.9rem;
  font-weight: 700;
}

.stats-pill--button {
  cursor: pointer;
  background: rgba(170, 107, 46, 0.1);
  color: var(--accent);
}

.stats-pill--button:hover {
  background: rgba(170, 107, 46, 0.18);
}

@media (max-width: 900px) {
  /* 移动端响应式规则：所有左右两栏在窄屏下改为单列。前端定稿，不需修改。 */
  .site-footer__inner,
  .card-grid,
  .content-layout,
  .home-layout,
  .home-grid.secondary {
    grid-template-columns: 1fr;
  }
  .section-shell {
    gap: 0.7rem;
  }
  .card-grid {
    gap: 0.6rem;
  }
  .content-card {
    padding: 0.65rem 0.85rem;
    gap: 0.3rem;
  }
  .content-sidebar {
    position: static;
  }
  .home-hero,
  .home-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .page-card,
  .home-shell {
    padding: 1.2rem;
  }
  .site-header__inner { padding: 0.8rem 0; }
}