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

/* ===== 变量 ===== */
:root {
  --c-primary: #1A1A2E;
  --c-accent: #E94560;
  --c-bg: #F5F5F5;
  --c-white: #ffffff;
  --c-text: #1A1A2E;
  --c-text-muted: #5a5a72;
  --c-border: #dddde8;
  --c-card-bg: #ffffff;
  --c-primary-light: #252547;
  --c-accent-dark: #c73650;
  --radius: 4px;
  --nav-h: 64px;
  --max-w: 1200px;
  --gap: 24px;
  --transition: 160ms ease;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--c-text);
  background: var(--c-bg);
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ===== 导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-primary);
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
}

.brand-mark {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  min-height: 40px;
  text-decoration: none;
}

.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--c-accent);
  color: var(--c-white);
  font-size: 11px;
  font-weight: 700;
  border-radius: var(--radius);
  letter-spacing: -0.5px;
}

.main-nav {
  flex: 1;
  overflow: hidden;
}

.main-nav p {
  display: flex;
  flex-wrap: nowrap;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 2px;
}
.main-nav p::-webkit-scrollbar { display: none; }

.main-nav p a {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  min-height: 40px;
  color: rgba(245,245,245,0.85);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition);
}
.main-nav p a:hover,
.main-nav p a[aria-current] {
  background: var(--c-accent);
  color: var(--c-white);
}

.nav-search {
  flex-shrink: 0;
}
.nav-search form {
  display: flex;
  align-items: center;
  background: var(--c-primary-light);
  border-radius: var(--radius);
  overflow: hidden;
}
.nav-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--c-bg);
  font: 14px 'DM Sans', sans-serif;
  padding: 8px 12px;
  width: 160px;
}
.nav-search input::placeholder { color: rgba(245,245,245,0.45); }
.nav-search button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--c-accent);
  color: var(--c-white);
  transition: background var(--transition);
}
.nav-search button:hover { background: var(--c-accent-dark); }

/* ===== Hero 首页 ===== */
.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-h));
  display: flex;
  align-items: center;
  justify-content: flex-end;
  background: var(--c-primary);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
  margin-bottom: -5vw;
}

.hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.25;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 30%, var(--c-primary) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: right;
  padding: 60px 5% 100px;
  max-width: 640px;
}

.hero-eyebrow {
  display: inline-block;
  background: var(--c-accent);
  color: var(--c-white);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 4px 12px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  text-transform: uppercase;
}

.hero-content h1 {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero-lead {
  font-size: 18px;
  color: rgba(245,245,245,0.75);
  margin-bottom: 32px;
  line-height: 1.6;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  background: var(--c-accent);
  color: var(--c-white);
  font-size: 16px;
  font-weight: 700;
  border-radius: var(--radius);
  transition: background var(--transition), transform var(--transition);
  min-height: 48px;
}
.btn-primary:hover {
  background: var(--c-accent-dark);
  transform: translateY(-2px);
}

/* ===== Channel Hero ===== */
.channel-hero {
  background: var(--c-primary);
  padding: 60px 20px 80px;
  clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
  margin-bottom: -40px;
  position: relative;
}
.channel-hero-content {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-top: 20px;
}
.channel-hero-content h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--c-white);
  margin: 12px 0 16px;
}
.channel-lead {
  font-size: 17px;
  color: rgba(245,245,245,0.75);
  max-width: 600px;
}

/* ===== Tag Banner ===== */
.tag-banner {
  background: var(--c-primary-light);
  border-left: 6px solid var(--c-accent);
  padding: 48px 20px 60px;
}
.tag-banner-content {
  max-width: var(--max-w);
  margin: 0 auto;
}
.tag-banner-content h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.8rem);
  font-weight: 700;
  color: var(--c-white);
  margin: 12px 0 12px;
}
.tag-banner-content p {
  color: rgba(245,245,245,0.75);
}
.tag-badge {
  display: inline-block;
  background: var(--c-accent);
  color: var(--c-white);
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius);
  margin-bottom: 8px;
}

/* ===== About / Privacy Banner ===== */
.about-banner,
.privacy-banner {
  background: var(--c-primary);
  padding: 60px 20px 70px;
  border-bottom: 4px solid var(--c-accent);
}
.about-banner-content,
.privacy-banner-content {
  max-width: var(--max-w);
  margin: 0 auto;
}
.about-banner-content h1,
.privacy-banner-content h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.8rem);
  font-weight: 700;
  color: var(--c-white);
  margin: 12px 0 12px;
}
.about-banner-content p,
.privacy-banner-content p {
  color: rgba(245,245,245,0.75);
  font-size: 17px;
}
.privacy-dates {
  display: flex;
  gap: 16px;
  margin-top: 12px;
  flex-wrap: wrap;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: rgba(245,245,245,0.55);
  flex-wrap: wrap;
}
.breadcrumb a {
  color: rgba(245,245,245,0.7);
  transition: color var(--transition);
}
.breadcrumb a:hover { color: var(--c-accent); }
.breadcrumb span { color: rgba(245,245,245,0.45); }

/* ===== 布局：带侧边栏 ===== */
.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 20px;
}

.wrap-with-aside {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 40px;
  align-items: start;
}

/* home wrap 特殊 */
.page-home .wrap {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 40px;
  align-items: start;
}

.page-home .section-channels,
.page-home .section-latest {
  grid-column: 1;
}
.page-home .home-aside {
  grid-column: 2;
  grid-row: 1 / span 2;
}

/* ===== aside 通用 ===== */
aside {
  position: sticky;
  top: calc(var(--nav-h) + 20px);
}
.aside-inner {
  background: var(--c-white);
  border-radius: var(--radius);
  padding: 24px;
}
.aside-inner h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 20px;
  margin-bottom: 8px;
}
.aside-inner h3:first-child { margin-top: 0; }
.aside-inner hr {
  border: none;
  border-top: 2px solid var(--c-accent);
  margin-bottom: 12px;
}

.aside-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.aside-nav a {
  display: block;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--c-text);
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}
.aside-nav a:hover {
  background: var(--c-bg);
  color: var(--c-accent);
}

.related-link {
  display: block;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--c-text);
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}
.related-link:hover {
  background: var(--c-bg);
  color: var(--c-accent);
}

/* ===== 标题装饰 hr ===== */
h2 + hr, h3 + hr {
  border: none;
  border-top: 3px solid var(--c-accent);
  margin: 8px 0 20px;
}

hr {
  border: none;
  border-top: 2px solid var(--c-border);
  margin: 20px 0;
}

/* ===== 卡片 ===== */
.card {
  background: var(--c-white);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition);
}
.card:hover { transform: translateY(-3px); }
.card a {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 20px;
  color: var(--c-text);
  text-decoration: none;
}
.card-tag {
  display: inline-block;
  background: var(--c-primary);
  color: var(--c-white);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius);
  margin-bottom: 10px;
  align-self: flex-start;
  letter-spacing: 0.5px;
}
.card h3 {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 8px;
  color: var(--c-primary);
}
.card p {
  font-size: 14px;
  color: var(--c-text-muted);
  flex: 1;
  margin-bottom: 12px;
  line-height: 1.55;
}
.card time {
  font-size: 12px;
  color: var(--c-text-muted);
  margin-bottom: 10px;
}
.card-cta {
  font-size: 13px;
  font-weight: 700;
  color: var(--c-accent);
  margin-top: auto;
  transition: letter-spacing var(--transition);
}
.card:hover .card-cta { letter-spacing: 0.5px; }

/* 频道卡片网格 */
.section-channels {
  background: var(--c-white);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 32px;
}

.section-channels .section-intro {
  margin-bottom: 24px;
}

.channel-card,
.tag-article-card,
.article-card {
  margin-bottom: 16px;
}

.section-channels > .channel-card:last-child { margin-bottom: 0; }

/* channel 子页卡片含缩略图 */
.child-card a {
  flex-direction: row;
  gap: 16px;
  padding: 16px;
}
.card-thumb-wrap {
  flex-shrink: 0;
  width: 100px;
  height: 70px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--c-bg);
}
.card-thumb-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.card-body {
  flex: 1;
}

/* 最新文章网格 */
.section-latest {
  background: var(--c-white);
  border-radius: var(--radius);
  padding: 28px;
}
.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.articles-grid .article-card {
  margin-bottom: 0;
}

/* tag 文章列表 */
.tag-articles-section {
  background: var(--c-white);
  border-radius: var(--radius);
  padding: 28px;
  margin-top: 24px;
}

/* ===== 子页列表（article > div×n）===== */
.child-list {
  background: var(--c-white);
  border-radius: var(--radius);
  padding: 28px;
  margin-top: 24px;
}

/* ===== Article 正文 ===== */
.article-main,
.about-main,
.privacy-main,
.tag-main,
.default-main {
  min-width: 0;
}

.article-section,
.about-section,
.privacy-section,
.tag-intro-section,
.default-section {
  background: var(--c-white);
  border-radius: var(--radius);
  overflow: hidden;
}

.article-body,
.about-body,
.privacy-body,
.tag-intro,
.default-body {
  padding: 32px;
}

.article-header {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--c-bg);
}
.article-header h1 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-primary);
  margin: 12px 0 12px;
}
.article-meta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.article-date,
.article-date-mod {
  font-size: 13px;
  color: var(--c-text-muted);
}

.article-hero-img-wrap {
  margin-bottom: 24px;
  border-radius: var(--radius);
  overflow: hidden;
}
.article-hero-img-wrap img {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
}

.article-content,
.about-content,
.privacy-content,
.default-content {
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-text);
}
.article-content h2,
.about-content h2,
.privacy-content h2,
.default-content h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 2em 0 0.5em;
  color: var(--c-primary);
}
.article-content h3,
.about-content h3,
.privacy-content h3,
.default-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 1.5em 0 0.4em;
  color: var(--c-primary);
}
.article-content p,
.about-content p,
.privacy-content p,
.default-content p {
  margin-bottom: 1.2em;
}
.article-content a,
.about-content a,
.privacy-content a,
.default-content a {
  color: var(--c-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.article-content ul,
.article-content ol,
.about-content ul,
.privacy-content ul {
  padding-left: 1.5em;
  margin-bottom: 1.2em;
}
.article-content li,
.about-content li,
.privacy-content li {
  list-style: disc;
  margin-bottom: 0.4em;
}

/* ===== 关于页额外区块 ===== */
.about-extra {
  background: var(--c-white);
  border-radius: var(--radius);
  padding: 28px;
  margin-top: 24px;
}
.stat-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.stat-item {
  flex: 1;
  min-width: 80px;
  background: var(--c-bg);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  border-top: 3px solid var(--c-accent);
}
.stat-num {
  display: block;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--c-primary);
}
.stat-label {
  font-size: 13px;
  color: var(--c-text-muted);
}

/* ===== Channel 简介 ===== */
.channel-intro {
  background: var(--c-white);
  border-radius: var(--radius);
  padding: 28px;
  font-size: 16px;
  line-height: 1.7;
}
.channel-intro h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 1.5em 0 0.4em;
  color: var(--c-primary);
}
.channel-intro p { margin-bottom: 1em; }
.channel-intro a { color: var(--c-accent); text-decoration: underline; }

/* ===== tag 简介 ===== */
.tag-intro {
  font-size: 16px;
  line-height: 1.7;
}
.tag-intro p { margin-bottom: 1em; }
.tag-intro a { color: var(--c-accent); text-decoration: underline; }

/* ===== 标签云 ===== */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 4px;
}
.tag-pill {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  background: var(--c-bg);
  color: var(--c-text);
  font-size: 13px;
  font-weight: 500;
  border-radius: 2px;
  min-height: 32px;
  transition: background var(--transition), color var(--transition);
}
.tag-pill:hover {
  background: var(--c-accent);
  color: var(--c-white);
}

/* ===== 日期文字 ===== */
time {
  font-size: 13px;
  color: var(--c-text-muted);
}

.empty-tip {
  color: var(--c-text-muted);
  font-size: 15px;
  padding: 12px 0;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--c-primary);
  margin-top: 60px;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 28px 20px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}
.brand-icon-sm {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--c-accent);
  color: var(--c-white);
  font-size: 9px;
  font-weight: 700;
  border-radius: var(--radius);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  flex: 1;
}
.footer-nav a {
  padding: 8px 10px;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  color: rgba(245,245,245,0.65);
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}
.footer-nav a:hover {
  color: var(--c-white);
  background: rgba(255,255,255,0.08);
}

.footer-copy {
  text-align: center;
  width: 100%;
  padding-top: 16px;
  border-top: 1px solid rgba(245,245,245,0.12);
}
.footer-copy p {
  font-size: 13px;
  color: rgba(245,245,245,0.45);
  line-height: 1.7;
}

/* ===== 动效 stagger ===== */
@media (prefers-reduced-motion: no-preference) {
  .card {
    animation: fadeUp 0.3s ease both;
  }
  .channel-card:nth-child(1) { animation-delay: 0ms; }
  .channel-card:nth-child(2) { animation-delay: 60ms; }
  .channel-card:nth-child(3) { animation-delay: 120ms; }
  .channel-card:nth-child(4) { animation-delay: 180ms; }
  .child-card:nth-child(1) { animation-delay: 0ms; }
  .child-card:nth-child(2) { animation-delay: 50ms; }
  .child-card:nth-child(3) { animation-delay: 100ms; }
  .child-card:nth-child(4) { animation-delay: 150ms; }
  .child-card:nth-child(5) { animation-delay: 200ms; }
  .article-card:nth-child(1) { animation-delay: 0ms; }
  .article-card:nth-child(2) { animation-delay: 60ms; }
  .article-card:nth-child(3) { animation-delay: 120ms; }
  .article-card:nth-child(4) { animation-delay: 180ms; }
  .article-card:nth-child(5) { animation-delay: 240ms; }
  .article-card:nth-child(6) { animation-delay: 300ms; }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  .wrap-with-aside,
  .page-home .wrap {
    grid-template-columns: 1fr;
  }
  .page-home .home-aside {
    grid-column: 1;
    grid-row: auto;
  }
  aside {
    position: static;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  :root { --nav-h: 56px; }

  .site-header {
    padding: 0 12px;
    gap: 8px;
  }
  .main-nav p a {
    padding: 8px 8px;
    font-size: 13px;
  }
  .nav-search input {
    width: 100px;
    font-size: 13px;
  }

  .hero {
    clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
    align-items: flex-end;
  }
  .hero-content {
    text-align: left;
    padding: 40px 16px 80px;
    max-width: 100%;
  }
  .hero-content h1 { font-size: 1.9rem; }
  .hero-lead { font-size: 15px; }

  .channel-hero { padding: 40px 16px 70px; }
  .channel-hero-content h1 { font-size: 1.6rem; }

  .wrap { padding: 24px 12px; }

  .article-body,
  .about-body,
  .privacy-body { padding: 20px 16px; }

  .section-channels,
  .section-latest,
  .child-list,
  .tag-articles-section { padding: 20px 16px; }

  .child-card a {
    flex-direction: column;
  }
  .card-thumb-wrap {
    width: 100%;
    height: 140px;
  }

  .stat-row { gap: 10px; }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 20px 16px;
  }
  .footer-nav {
    flex-wrap: wrap;
  }
  .footer-copy { padding-top: 12px; }
}