@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ===== CSS 变量 ===== */
:root {
  --blue: #c8e0f4;
  --pink: #f5e0e8;
  --dark: #171f26;
  --dark2: #1e2834;
  --dark3: #253040;
  --blue-light: #daedfb;
  --pink-light: #faeef3;
  --blue-dark: #8ab8d8;
  --pink-dark: #d8a8bc;
  --text: #c8e0f4;
  --text-muted: #8ab0c8;
  --text-dim: #5a7a8e;
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --shadow-out: -5px -5px 15px rgba(200,224,244,0.05), 5px 5px 15px rgba(0,0,0,0.45);
  --shadow-in: inset -3px -3px 8px rgba(200,224,244,0.04), inset 3px 3px 10px rgba(0,0,0,0.5);
  --shadow-card: -4px -4px 12px rgba(200,224,244,0.06), 4px 4px 14px rgba(0,0,0,0.5);
  --transition: 150ms ease;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --max-w: 1140px;
  --content-w: 720px;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background-color: var(--dark);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--blue-light); }
ul, ol { list-style: none; }
h1, h2, h3, h4 { line-height: 1.3; font-weight: 700; }

/* ===== 顶部公告条 ===== */
.header-announce {
  background: linear-gradient(90deg, var(--dark2), var(--dark3));
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-align: center;
  padding: 6px 16px;
  border-bottom: 1px solid rgba(200,224,244,0.07);
}

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(135deg, var(--dark2) 0%, var(--dark3) 100%);
  box-shadow: var(--shadow-card);
  border-bottom: 1px solid rgba(200,224,244,0.08);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  height: 60px;
}

.brand-mark {
  flex-shrink: 0;
}

.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--dark3), var(--dark));
  box-shadow: var(--shadow-out);
  color: var(--pink);
  font-size: 1.1rem;
  font-weight: 700;
  text-decoration: none;
  transition: box-shadow var(--transition), transform var(--transition);
}
.brand-icon:hover {
  box-shadow: var(--shadow-in);
  transform: scale(0.97);
  color: var(--pink-light);
}

.logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
}

/* nav > p > a 结构 */
.main-nav {
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
}
.main-nav::-webkit-scrollbar { display: none; }

.main-nav p {
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  flex-wrap: nowrap;
}

.main-nav p a {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 14px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  background: transparent;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
  white-space: nowrap;
  min-height: 40px;
}
.main-nav p a:hover,
.main-nav p a.active {
  background: linear-gradient(145deg, var(--dark3), var(--dark2));
  box-shadow: var(--shadow-out);
  color: var(--blue);
}
.main-nav p a.active {
  color: var(--pink);
}

/* ===== 锚点条 ===== */
.sticky-anchor-bar {
  position: sticky;
  top: 100px;
  z-index: 90;
  background: linear-gradient(135deg, var(--dark2), var(--dark));
  border-bottom: 1px solid rgba(200,224,244,0.06);
  padding: 8px 0;
}
.anchor-bar-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.anchor-bar-inner::-webkit-scrollbar { display: none; }
.anchor-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  flex-shrink: 0;
}
.anchor-pill {
  display: inline-flex;
  align-items: center;
  height: 30px;
  padding: 0 12px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  color: var(--text-muted);
  background: linear-gradient(145deg, var(--dark3), var(--dark2));
  box-shadow: -2px -2px 6px rgba(200,224,244,0.04), 2px 2px 6px rgba(0,0,0,0.4);
  transition: box-shadow var(--transition), color var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}
.anchor-pill:hover {
  color: var(--blue);
  box-shadow: var(--shadow-in);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  height: 45vh;
  min-height: 280px;
  max-height: 520px;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: linear-gradient(135deg, var(--dark3) 0%, #2a1a22 100%);
}
.hero-placeholder {
  background: linear-gradient(145deg, var(--dark3) 0%, #1c2a36 50%, #2a1520 100%);
}
.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.hero-mask {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(to right, rgba(23,31,38,0.2) 0%, rgba(23,31,38,0.75) 100%),
              linear-gradient(to top, rgba(23,31,38,0.85) 0%, rgba(23,31,38,0.1) 60%);
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: right;
  padding: 32px 40px 40px;
  max-width: 680px;
}
.hero-h1 {
  font-size: clamp(1.5rem, 3.5vw, 2.4rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
  text-shadow: 0 2px 12px rgba(0,0,0,0.6);
}
.hero-lead {
  font-size: 0.95rem;
  color: rgba(200,224,244,0.85);
  margin-bottom: 20px;
  line-height: 1.6;
}

/* ===== 按钮 ===== */
.btn-pill {
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding: 0 24px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--dark);
  background: linear-gradient(145deg, var(--pink-light), var(--pink));
  box-shadow: var(--shadow-out);
  transition: box-shadow var(--transition), transform var(--transition);
  text-decoration: none;
}
.btn-pill:hover {
  box-shadow: var(--shadow-in);
  transform: scale(0.97);
  color: var(--dark);
}
.btn-pill-sm {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 18px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--dark);
  background: linear-gradient(145deg, var(--blue-light), var(--blue));
  box-shadow: -3px -3px 8px rgba(200,224,244,0.05), 3px 3px 10px rgba(0,0,0,0.4);
  transition: box-shadow var(--transition), transform var(--transition);
  text-decoration: none;
}
.btn-pill-sm:hover {
  box-shadow: var(--shadow-in);
  transform: scale(0.97);
  color: var(--dark);
}

/* ===== 页面 Banner（非首页顶部块） ===== */
.page-banner {
  background: linear-gradient(135deg, var(--dark2) 0%, var(--dark3) 100%);
  border-bottom: 1px solid rgba(200,224,244,0.07);
  padding: 40px 24px 36px;
}
.page-banner-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.banner-eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--pink);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.banner-h1 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--blue-light);
  margin-bottom: 8px;
}
.banner-date {
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* ===== 主体布局 ===== */
main {
  min-height: 50vh;
}
.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 24px;
}

/* 双栏通用布局 */
.topic-wrap,
.article-wrap,
.about-wrap,
.privacy-wrap {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: start;
}

/* ===== Section / Article 嵌套（契约要求 main>article.wrap>section>div） ===== */
.topic-main-section,
.article-main-section,
.about-main-section,
.privacy-main-section,
.home-content-section {
  min-width: 0;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--blue); }
.bc-sep { color: var(--text-dim); }

/* ===== 页面 H1 ===== */
.page-h1 {
  font-size: clamp(1.4rem, 2.8vw, 1.9rem);
  font-weight: 700;
  color: var(--blue-light);
  margin-bottom: 12px;
}

/* ===== 文章元信息 ===== */
.article-meta,
.page-meta {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.article-meta time,
.page-meta time {
  color: var(--text-muted);
}

/* ===== 正文内容 ===== */
.page-content {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
}
.page-content h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--blue-light);
  margin: 2em 0 0.5em;
}
.page-content h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--pink);
  margin: 1.6em 0 0.4em;
}
.page-content p { margin-bottom: 1.1em; }
.page-content ul,
.page-content ol {
  margin: 0.8em 0 1em 1.5em;
  list-style: disc;
}
.page-content ol { list-style: decimal; }
.page-content li { margin-bottom: 0.4em; }
.page-content a { color: var(--blue); border-bottom: 1px solid rgba(200,224,244,0.2); }
.page-content a:hover { color: var(--blue-light); border-bottom-color: var(--blue); }
.page-content blockquote {
  border-left: 3px solid var(--pink-dark);
  margin: 1.5em 0;
  padding: 12px 20px;
  background: rgba(245,224,232,0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-muted);
  font-style: italic;
}
.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.9rem;
}
.page-content th,
.page-content td {
  padding: 10px 14px;
  border: 1px solid rgba(200,224,244,0.1);
  text-align: left;
}
.page-content th {
  background: rgba(200,224,244,0.08);
  color: var(--blue);
  font-weight: 600;
}
.page-content code {
  background: rgba(200,224,244,0.08);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.88em;
  color: var(--pink);
}
.page-content pre {
  background: var(--dark2);
  padding: 16px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 1.2em 0;
}
.page-content pre code {
  background: none;
  padding: 0;
}

/* ===== HR 装饰（h2/h3 后） ===== */
hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, rgba(200,224,244,0.15), rgba(200,224,244,0.03));
  margin: 10px 0 20px;
}

/* ===== Section Heading ===== */
.section-heading {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 6px;
}

/* ===== 首页话题卡片网格（ol > li > a + small） ===== */
.topics-section {
  margin-top: 40px;
}
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 18px;
  list-style: none;
  margin-top: 20px;
}
.topic-card {
  border-radius: 18px;
  background: linear-gradient(145deg, var(--dark3), var(--dark2));
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition), transform var(--transition);
  overflow: hidden;
}
.topic-card:hover {
  box-shadow: -6px -6px 18px rgba(200,224,244,0.07), 6px 6px 18px rgba(0,0,0,0.6);
  transform: translateY(-2px);
}
.topic-card-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 20px;
  text-decoration: none;
  color: inherit;
  height: 100%;
}
.topic-card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--blue-light);
  line-height: 1.4;
}
.topic-card-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
  flex: 1;
}
.topic-card-count {
  font-size: 0.75rem;
  color: var(--pink-dark);
  font-weight: 500;
  margin-top: 6px;
}

/* ===== 栏目子页列表（ol > li > a + small） ===== */
.children-section {
  margin-top: 40px;
}
.child-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  list-style: none;
  margin-top: 16px;
}
.child-item {
  border-radius: 18px;
  background: linear-gradient(145deg, var(--dark3), var(--dark2));
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition), transform var(--transition);
  overflow: hidden;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
}
.child-item:hover {
  box-shadow: -4px -4px 14px rgba(200,224,244,0.06), 4px 4px 14px rgba(0,0,0,0.55);
  transform: translateX(3px);
}
.child-link {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
  text-decoration: none;
  color: inherit;
  min-width: 0;
}
.child-num {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--pink-dark);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
  width: 28px;
}
.child-info {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}
.child-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--blue-light);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.child-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.child-date {
  font-size: 0.75rem;
  color: var(--text-dim);
  flex-shrink: 0;
  margin-left: auto;
}
.child-date time { color: inherit; }

/* ===== 返回栏目 ===== */
.back-to-topic {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid rgba(200,224,244,0.08);
}

/* ===== 文章 Hero Banner ===== */
.article-hero-banner {
  height: 240px;
  overflow: hidden;
  background: var(--dark2);
}
.article-hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== Aside ===== */
.global-aside {
  max-width: var(--max-w);
  margin: 0 auto 40px;
  padding: 0 24px;
}
.topic-aside,
.article-aside,
.about-aside,
.privacy-aside {
  position: sticky;
  top: 120px;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.aside-inner {
  border-radius: 18px;
  background: linear-gradient(145deg, var(--dark3), var(--dark2));
  box-shadow: var(--shadow-card);
  padding: 20px;
  margin-bottom: 18px;
}
.aside-mt { margin-top: 0; }
.aside-heading {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--pink);
  margin-bottom: 8px;
  letter-spacing: 0.04em;
}
.aside-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.aside-links li a {
  display: block;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
  line-height: 1.4;
}
.aside-links li a:hover {
  background: rgba(200,224,244,0.07);
  color: var(--blue);
}

/* ===== 页脚 ===== */
.site-footer {
  border-top: 1px solid rgba(200,224,244,0.07);
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark2) 100%);
  padding: 32px 24px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.footer-brand {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  color: rgba(200,224,244,0.12);
  letter-spacing: 0.04em;
  line-height: 1;
  user-select: none;
}
.footer-address {
  font-size: 0.78rem;
  color: var(--text-dim);
  font-style: normal;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 6px;
  list-style: none;
}
.footer-links li a {
  display: inline-flex;
  align-items: center;
  height: 32px;
  padding: 0 12px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  color: var(--text-dim);
  transition: color var(--transition), background var(--transition);
}
.footer-links li a:hover {
  color: var(--blue);
  background: rgba(200,224,244,0.06);
}
.footer-copy {
  font-size: 0.72rem;
  color: var(--text-dim);
}

/* ===== 首页主内容 ===== */
.home-article {
  background: linear-gradient(145deg, var(--dark3), var(--dark2));
  border-radius: 18px;
  box-shadow: var(--shadow-card);
  padding: 32px;
}

/* ===== Privacy 内容 ===== */
.privacy-content h2 { margin-top: 1.8em; }

/* ===== Scroll Reveal 动效 ===== */
@media (prefers-reduced-motion: no-preference) {
  .topic-card,
  .child-item,
  .aside-inner,
  .home-article {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.5s ease, transform 0.5s ease, box-shadow var(--transition);
  }
  .topic-card.revealed,
  .child-item.revealed,
  .aside-inner.revealed,
  .home-article.revealed {
    opacity: 1;
    transform: translateY(0);
  }
  .topic-card:nth-child(1) { transition-delay: 0ms; }
  .topic-card:nth-child(2) { transition-delay: 60ms; }
  .topic-card:nth-child(3) { transition-delay: 120ms; }
  .topic-card:nth-child(4) { transition-delay: 180ms; }
  .topic-card:nth-child(5) { transition-delay: 240ms; }
  .topic-card:nth-child(6) { transition-delay: 300ms; }
  .child-item:nth-child(1) { transition-delay: 0ms; }
  .child-item:nth-child(2) { transition-delay: 50ms; }
  .child-item:nth-child(3) { transition-delay: 100ms; }
  .child-item:nth-child(4) { transition-delay: 150ms; }
  .child-item:nth-child(5) { transition-delay: 200ms; }
  .child-item:nth-child(6) { transition-delay: 250ms; }
}
@media (prefers-reduced-motion: reduce) {
  .topic-card,
  .child-item,
  .aside-inner,
  .home-article {
    opacity: 1;
    transform: none;
    transition: box-shadow var(--transition);
  }
}

/* ===== 响应式 ===== */
@media (max-width: 860px) {
  .topic-wrap,
  .article-wrap,
  .about-wrap,
  .privacy-wrap {
    grid-template-columns: 1fr;
  }
  .topic-aside,
  .article-aside,
  .about-aside,
  .privacy-aside {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 16px;
  }
  .aside-inner {
    flex: 1;
    min-width: 200px;
    margin-bottom: 0;
  }
}

@media (max-width: 600px) {
  .header-inner { padding: 0 16px; }
  .hero-content { padding: 20px 20px 28px; }
  .hero-h1 { font-size: 1.3rem; }
  .wrap { padding: 24px 16px; }
  .topic-grid { grid-template-columns: 1fr; }
  .child-item { flex-direction: column; align-items: flex-start; gap: 8px; }
  .child-date { margin-left: 0; }
  .home-article { padding: 20px; }
  .main-nav p a { padding: 0 10px; font-size: 0.78rem; }
  .footer-brand { font-size: 1.6rem; }
  .page-banner { padding: 28px 16px 24px; }
  .banner-h1 { font-size: 1.3rem; }
  .aside-inner { min-width: 100%; }
  .sticky-anchor-bar { top: 96px; }
  .anchor-bar-inner { padding: 0 16px; }
}

@media (max-width: 400px) {
  .hero { min-height: 240px; height: 42vh; }
  .hero-content { padding: 16px 16px 24px; }
}