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

/* ===== 变量 ===== */
:root {
  --c-primary: #56228b;
  --c-secondary: #8b4513;
  --c-bg: #1f1726;
  --c-bg2: #2a1e35;
  --c-bg3: #342240;
  --c-text: #e8e0f0;
  --c-text-muted: #a898c0;
  --c-border: #3d2d55;
  --c-accent: #9b59d0;
  --c-warm: #c07840;
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --font-serif: 'Newsreader', Georgia, serif;
  --font-sans: 'Roboto', system-ui, sans-serif;
  --header-h: 64px;
  --max-w: 1140px;
  --aside-w: 220px;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 17px; scroll-behavior: smooth; }
body {
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-sans);
  line-height: 1.7;
  min-height: 100vh;
}
a { color: var(--c-accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--c-warm); }
img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }

/* ===== 网格底纹 ===== */
.hero-dots, .inner-page-hero .hero-dots, .topic-hero .hero-dots {
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    radial-gradient(circle, rgba(86,34,139,.35) 1px, transparent 1px);
  background-size: 28px 28px;
}

/* ===== 站头 ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(31,23,38,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
  height: var(--header-h);
}
.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--c-text);
  white-space: nowrap;
  flex-shrink: 0;
}
.brand:hover { color: var(--c-accent); }
.header-search {
  margin-left: auto;
  display: flex;
  align-items: center;
}
.header-search form {
  display: flex;
  align-items: center;
  background: var(--c-bg3);
  border: 1px solid var(--c-border);
  border-radius: 24px;
  overflow: hidden;
  transition: border-color .2s;
}
.header-search form:focus-within { border-color: var(--c-primary); }
.header-search input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--c-text);
  font-size: .93rem;
  padding: 8px 16px;
  width: 200px;
}
.header-search button {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px 14px;
  font-size: 1rem;
  min-height: 40px;
  color: var(--c-text-muted);
  transition: color .2s;
}
.header-search button:hover { color: var(--c-accent); }

/* ===== 面包屑 ===== */
.breadcrumb {
  max-width: var(--max-w);
  margin: 16px auto 0;
  padding: 0 24px;
  font-size: .85rem;
  color: var(--c-text-muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}
.breadcrumb a { color: var(--c-text-muted); }
.breadcrumb a:hover { color: var(--c-accent); }
.breadcrumb span[aria-hidden] { opacity: .5; }

/* ===== Hero 首页 ===== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(145deg, var(--c-bg) 0%, var(--c-bg2) 60%, #2d1840 100%);
}
.hero-blob {
  position: absolute;
  right: 5%;
  top: 10%;
  width: 420px;
  opacity: .7;
  pointer-events: none;
  z-index: 0;
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 620px;
  padding: 48px 24px 48px 10%;
}
.hero-illustration {
  position: absolute;
  right: 8%;
  top: 50%;
  transform: translateY(-50%);
  width: 160px;
  z-index: 1;
  opacity: .85;
}
.eyebrow-tag {
  display: inline-block;
  background: rgba(86,34,139,.25);
  border: 1px solid rgba(86,34,139,.55);
  color: var(--c-accent);
  font-size: .78rem;
  font-family: var(--font-sans);
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 18px;
}
.hero-content h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--c-text);
  margin-bottom: 16px;
}
.hero-content .subtitle {
  font-size: 1.05rem;
  color: var(--c-text-muted);
  margin-bottom: 32px;
  line-height: 1.7;
}
.hero-cta {
  display: inline-block;
  background: var(--c-primary);
  color: #fff;
  font-weight: 500;
  padding: 14px 32px;
  border-radius: var(--radius-lg);
  font-size: .97rem;
  transition: background .2s, transform .2s;
  min-height: 48px;
  line-height: 1.4;
}
.hero-cta:hover {
  background: #6d2dad;
  color: #fff;
  transform: translateY(-2px);
}

/* ===== 内页 Hero ===== */
.inner-page-hero, .topic-hero {
  position: relative;
  padding: 72px 10% 56px;
  background: linear-gradient(135deg, var(--c-bg2) 0%, var(--c-bg) 100%);
  overflow: hidden;
}
.inner-page-hero .eyebrow-tag, .topic-hero .eyebrow-tag { margin-bottom: 14px; }
.inner-page-hero h1, .topic-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  font-weight: 700;
  color: var(--c-text);
  line-height: 1.3;
  max-width: 680px;
  position: relative; z-index: 1;
}
.topic-hero-content { position: relative; z-index: 1; max-width: 680px; }
.topic-hero-content .subtitle {
  font-size: 1rem;
  color: var(--c-text-muted);
  margin-top: 12px;
  line-height: 1.7;
}

/* ===== 主体布局 ===== */
main {
  padding: 40px 0 60px;
}
.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}
.content-section {
  display: grid;
  grid-template-columns: var(--aside-w) 1fr;
  gap: 40px;
  align-items: start;
}

/* ===== 侧边栏 ===== */
.content-aside {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  background: var(--c-bg2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
}
.content-aside h2 {
  font-family: var(--font-serif);
  font-size: .95rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 4px;
}
.content-aside .subtitle {
  font-size: .78rem;
  color: var(--c-text-muted);
  margin-bottom: 16px;
}
.aside-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 20px;
}
.aside-nav li a {
  display: block;
  font-size: .88rem;
  color: var(--c-text-muted);
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  transition: background .2s, color .2s;
  line-height: 1.45;
}
.aside-nav li a:hover {
  background: rgba(86,34,139,.2);
  color: var(--c-text);
}

/* ===== 正文容器 ===== */
.page-content {
  background: var(--c-bg2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  min-width: 0;
}

/* ===== 文章正文 ===== */
.article-header { margin-bottom: 28px; }
.article-header .eyebrow-tag { margin-bottom: 10px; }
.article-header h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--c-text);
  margin-bottom: 14px;
}
.article-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: .85rem;
  color: var(--c-text-muted);
  margin-bottom: 20px;
}
.meta-label { color: var(--c-text-muted); }
.meta-sep { opacity: .5; }
.article-meta time { color: var(--c-warm); }
.article-hero-img {
  width: 100%;
  border-radius: var(--radius-md);
  margin-bottom: 8px;
}
.article-body {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--c-text);
}
.article-body h2 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--c-text);
  margin: 32px 0 10px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--c-border);
}
.article-body h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--c-accent);
  margin: 24px 0 8px;
}
.article-body p { margin-bottom: 18px; }
.article-body ul, .article-body ol {
  padding-left: 1.5em;
  margin-bottom: 18px;
}
.article-body li { margin-bottom: 6px; }
.article-body blockquote {
  border-left: 4px solid var(--c-primary);
  padding: 12px 20px;
  margin: 24px 0;
  background: rgba(86,34,139,.1);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--c-text-muted);
  font-style: italic;
}
.article-body a { color: var(--c-accent); text-decoration: underline; text-decoration-color: rgba(155,89,208,.4); }
.article-body a:hover { color: var(--c-warm); }

/* ===== h2 + .subtitle 模式 ===== */
.page-content h2 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--c-text);
  margin: 28px 0 6px;
}
.page-content h2:first-child { margin-top: 0; }
.page-content .subtitle, .page-content p.subtitle {
  font-size: .9rem;
  color: var(--c-text-muted);
  margin-bottom: 20px;
  line-height: 1.6;
}
.page-content p { margin-bottom: 16px; }

/* ===== 首页正文 ===== */
.home-content { font-family: var(--font-serif); font-size: 1.02rem; line-height: 1.85; }
.home-content h2 { margin-top: 28px; }
.home-content a { color: var(--c-accent); text-decoration: underline; }

/* ===== 专题卡片区 ===== */
.topics-section {
  background: var(--c-bg3);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
  padding: 56px 24px;
}
.topics-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.topics-inner h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 6px;
}
.topics-inner .subtitle {
  color: var(--c-text-muted);
  font-size: .95rem;
  margin-bottom: 32px;
}
.topic-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.topic-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--c-bg2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 24px 22px;
  color: var(--c-text);
  transition: border-color .2s, transform .2s;
}
.topic-card:hover {
  border-color: var(--c-primary);
  transform: translateY(-3px);
  color: var(--c-text);
}
.topic-card strong {
  font-family: var(--font-serif);
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.4;
  display: block;
}
.topic-card .card-desc {
  font-size: .87rem;
  color: var(--c-text-muted);
  line-height: 1.55;
}
.topic-card .card-date {
  font-size: .78rem;
  color: var(--c-warm);
  margin-top: 4px;
}

/* ===== 近期文章区 ===== */
.recent-section {
  padding: 48px 24px 56px;
}
.recent-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.recent-main h2 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 6px;
}
.recent-main .subtitle {
  color: var(--c-text-muted);
  font-size: .9rem;
  margin-bottom: 24px;
}
.recent-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.recent-item a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--c-bg2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  color: var(--c-text);
  transition: border-color .2s, background .2s;
}
.recent-item a:hover {
  border-color: var(--c-primary);
  background: var(--c-bg3);
  color: var(--c-text);
}
.recent-title {
  font-family: var(--font-serif);
  font-size: .97rem;
  flex: 1;
  line-height: 1.45;
}
.recent-date {
  font-size: .8rem;
  color: var(--c-warm);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ===== 子页卡片（topic 页） ===== */
.child-articles { margin-top: 36px; }
.child-articles h2 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 6px;
}
.child-articles .subtitle {
  font-size: .88rem;
  color: var(--c-text-muted);
  margin-bottom: 20px;
}
.child-cards-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.child-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--c-bg3);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  color: var(--c-text);
  transition: border-color .2s, transform .15s;
}
.child-card:hover {
  border-color: var(--c-secondary);
  transform: translateX(4px);
  color: var(--c-text);
}
.child-card strong {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
}
.child-card .card-desc {
  font-size: .86rem;
  color: var(--c-text-muted);
  line-height: 1.5;
}
.child-card time {
  font-size: .78rem;
  color: var(--c-warm);
}

/* ===== about 附加链接 ===== */
.about-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 28px;
}
.about-link-btn {
  display: inline-flex;
  align-items: center;
  background: rgba(86,34,139,.18);
  border: 1px solid var(--c-primary);
  border-radius: var(--radius-lg);
  padding: 10px 24px;
  color: var(--c-text);
  transition: background .2s;
  min-height: 44px;
}
.about-link-btn:hover { background: rgba(86,34,139,.38); color: var(--c-text); }
.about-link-btn strong { font-weight: 500; }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--c-bg);
  border-top: 1px solid var(--c-border);
  padding: 32px 24px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-brand {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 700;
  color: rgba(86,34,139,.5);
  letter-spacing: -.01em;
  line-height: 1;
  flex-shrink: 0;
}
.site-footer small {
  font-size: .82rem;
  color: var(--c-text-muted);
  line-height: 1.6;
}
.site-footer small a { color: var(--c-text-muted); }
.site-footer small a:hover { color: var(--c-accent); }

/* ===== Scroll Reveal ===== */
@media (prefers-reduced-motion: no-preference) {
  .topic-card, .child-card, .recent-item {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity .45s ease, transform .45s ease, border-color .2s, background .2s;
  }
  .topic-card.revealed, .child-card.revealed, .recent-item.revealed {
    opacity: 1;
    transform: translateY(0);
  }
  .topic-card:hover { transform: translateY(-3px); }
  .child-card:hover { transform: translateX(4px); }
}
@media (prefers-reduced-motion: reduce) {
  .topic-card, .child-card, .recent-item { opacity: 1; transform: none; }
}

/* ===== 响应式 ===== */
@media (max-width: 860px) {
  :root { --aside-w: 180px; }
  .content-section { gap: 24px; }
  .hero-content { padding-left: 5%; padding-right: 5%; }
  .hero-illustration { display: none; }
  .inner-page-hero, .topic-hero { padding: 48px 5% 36px; }
  .header-search input { width: 140px; }
}

@media (max-width: 640px) {
  .content-section {
    grid-template-columns: 1fr;
  }
  .content-aside {
    position: static;
    order: 2;
  }
  .page-content { order: 1; padding: 24px 18px; }
  .hero-section { min-height: 100vh; align-items: flex-start; padding-top: var(--header-h); }
  .hero-content { padding: 48px 20px 40px; }
  .hero-blob { display: none; }
  .topics-section, .recent-section { padding: 36px 16px; }
  .topic-cards { grid-template-columns: 1fr; }
  .site-footer { flex-direction: column; align-items: flex-start; gap: 10px; }
  .breadcrumb { margin-top: 10px; padding: 0 16px; }
  .inner-page-hero, .topic-hero { padding: 36px 16px 28px; }
  .header-search input { width: 100px; }
  .about-links { flex-direction: column; }
  .recent-item a { flex-direction: column; align-items: flex-start; gap: 4px; }
}