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

/* ===== 基础变量 ===== */
:root {
  --mint: #5cc6b0;
  --mint-dark: #3fa890;
  --mint-light: #a8e6da;
  --sand: #d4c4a8;
  --sand-light: #ede5d4;
  --sand-dark: #b8a888;
  --ink: #172623;
  --ink-soft: #2e4440;
  --ink-mute: #5a7570;
  --cream: #faf7f2;
  --warm-white: #f5f0e8;
  --terracotta: #c67b5c;
  --olive: #6b7b3c;
  --radius-card: 28px;
  --radius-sm: 12px;
  --radius-pill: 999px;
  --shadow-soft: 0 4px 24px rgba(23,38,35,0.10);
  --shadow-card: 0 2px 16px rgba(23,38,35,0.08);
  --transition: 0.3s ease-out;
  --font-head: 'Rubik', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Nunito Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --max-w: 1200px;
  --content-w: 860px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--cream);
  color: var(--ink);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}
a { color: var(--mint-dark); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--terracotta); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ===== 纹理叠加 ===== */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--ink);
  box-shadow: 0 2px 12px rgba(23,38,35,0.18);
}

.brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  border-bottom: 1px solid rgba(92,198,176,0.15);
}

.brand-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.brand-logo { height: 36px; width: auto; }

.brand-text {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--mint);
  letter-spacing: -0.02em;
}

.brand-tagline {
  font-size: 0.78rem;
  color: var(--sand);
  opacity: 0.7;
  max-width: 320px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 汉堡按钮 */
.burger-btn {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  min-height: 44px;
  min-width: 44px;
  justify-content: center;
  align-items: center;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.burger-btn:hover { background: rgba(92,198,176,0.12); }
.burger-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--mint);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.burger-btn.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger-btn.active span:nth-child(2) { opacity: 0; }
.burger-btn.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 菜单行 */
.menu-row {
  padding: 0 24px;
  background: var(--ink-soft);
}

.main-nav p {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0;
}

.main-nav p a {
  display: inline-block;
  color: var(--sand);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 10px 14px;
  min-height: 40px;
  line-height: 1.2;
  display: flex;
  align-items: center;
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}
.main-nav p a:hover {
  color: var(--mint);
  background: rgba(92,198,176,0.08);
}

/* 全屏遮罩菜单 */
.fullscreen-nav {
  position: fixed;
  inset: 0;
  background: var(--ink);
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.fullscreen-nav.open {
  opacity: 1;
  pointer-events: all;
}
.fullscreen-nav nav p {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.fullscreen-nav nav p a {
  font-family: var(--font-head);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--sand);
  padding: 12px 24px;
  min-height: 52px;
  display: flex;
  align-items: center;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  text-align: center;
}
.fullscreen-nav nav p a:hover {
  color: var(--mint);
  background: rgba(92,198,176,0.1);
}
.nav-close {
  position: absolute;
  top: 20px;
  right: 24px;
  font-size: 1.5rem;
  color: var(--sand);
  padding: 10px;
  min-height: 44px;
  min-width: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: color var(--transition);
}
.nav-close:hover { color: var(--mint); }

/* ===== HERO（首页） ===== */
.hero-section {
  min-height: 70vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 0;
  background: var(--warm-white);
  position: relative;
  overflow: hidden;
}

.hero-media {
  position: relative;
  height: 70vh;
  min-height: 400px;
  overflow: hidden;
}

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--sand) 0%, var(--mint-light) 50%, var(--sand-light) 100%);
}

.hero-badge {
  position: absolute;
  bottom: 24px;
  left: 24px;
  background: var(--terracotta);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.04em;
  box-shadow: var(--shadow-soft);
}

.hero-copy {
  padding: 48px 52px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 16px;
  background: var(--warm-white);
}

.hero-eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--mint-dark);
  text-transform: uppercase;
  background: rgba(92,198,176,0.12);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
}

.hero-copy h1 {
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3vw, 2.6rem);
  font-weight: 700;
  color: var(--ink);
  line-height: 1.25;
}

.hero-copy hr {
  width: 48px;
  height: 3px;
  background: var(--mint);
  border: none;
  border-radius: 2px;
  margin: 0;
}

.hero-lead {
  font-size: 1rem;
  color: var(--ink-soft);
  line-height: 1.7;
  max-width: 440px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--mint);
  color: var(--ink);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 12px 28px;
  min-height: 44px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-soft);
  transition: background var(--transition), transform var(--transition);
}
.btn-primary:hover {
  background: var(--mint-dark);
  color: #fff;
  transform: translateY(-2px);
}

/* ===== 主题 Hero（topic/tag/about/privacy） ===== */
.topic-hero, .tag-hero, .about-hero, .privacy-hero, .default-hero, .article-top {
  background: linear-gradient(135deg, var(--sand-light) 0%, var(--warm-white) 100%);
  padding: 52px 48px 40px;
  position: relative;
  overflow: hidden;
}

.topic-hero::before, .tag-hero::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(92,198,176,0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.topic-hero-inner, .topic-hero, .tag-hero, .about-hero, .privacy-hero {
  max-width: var(--max-w);
  margin: 0 auto;
}

.topic-hero h1, .tag-hero h1, .about-hero h1, .privacy-hero h1, .article-top h1, .default-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 2.8vw, 2.2rem);
  font-weight: 700;
  color: var(--ink);
  margin: 10px 0 12px;
  line-height: 1.3;
}

.topic-hero hr, .tag-hero hr, .about-hero hr, .privacy-hero hr, .article-top hr, .default-hero hr {
  width: 40px;
  height: 3px;
  background: var(--mint);
  border: none;
  border-radius: 2px;
  margin: 0 0 16px;
}

/* ===== 内容布局：左 aside + 主内容 ===== */
.content-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 24px 60px;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 36px;
  align-items: start;
}

/* aside 在内容左侧 */
.sidebar-left {
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: sticky;
  top: 100px;
}

.sidebar-widget {
  background: var(--sand-light);
  border-radius: var(--radius-card);
  padding: 20px;
  border-bottom: 3px solid var(--mint);
  box-shadow: var(--shadow-card);
}

.sidebar-widget h3 {
  font-family: var(--font-head);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}

.sidebar-widget hr {
  height: 2px;
  background: var(--sand-dark);
  border: none;
  border-radius: 1px;
  margin-bottom: 12px;
}

.sidebar-widget p {
  margin-bottom: 4px;
}

.sidebar-widget p a {
  font-size: 0.88rem;
  color: var(--ink-soft);
  display: block;
  padding: 5px 0;
  min-height: 32px;
  display: flex;
  align-items: center;
  transition: color var(--transition), padding-left var(--transition);
}
.sidebar-widget p a:hover {
  color: var(--mint-dark);
  padding-left: 6px;
}

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

/* ===== 正文 prose ===== */
.prose {
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.8;
}

.prose h2 {
  font-family: var(--font-head);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink);
  margin: 36px 0 12px;
}

.prose h3 {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--ink);
  margin: 28px 0 10px;
}

.prose p { margin-bottom: 16px; }

.prose a {
  color: var(--mint-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.prose a:hover { color: var(--terracotta); }

.prose ul, .prose ol {
  padding-left: 20px;
  margin-bottom: 16px;
}
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 8px; }

.prose blockquote {
  border-left: 4px solid var(--mint);
  background: var(--sand-light);
  padding: 14px 20px;
  margin: 20px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--ink-soft);
  font-style: italic;
}

.prose strong { color: var(--ink); font-weight: 700; }

.prose hr {
  border: none;
  height: 2px;
  background: var(--sand);
  margin: 28px 0;
  border-radius: 1px;
}

.prose img {
  border-radius: var(--radius-sm);
  margin: 20px 0;
  box-shadow: var(--shadow-card);
}

/* ===== 文章 meta ===== */
.article-meta {
  font-size: 0.85rem;
  color: var(--ink-mute);
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.article-meta time { color: var(--mint-dark); }

.breadcrumb {
  font-size: 0.82rem;
  color: var(--ink-mute);
  margin-bottom: 12px;
}
.breadcrumb a { color: var(--mint-dark); }
.breadcrumb span { color: var(--ink); }

.article-hero-wrap {
  margin: 20px 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.article-hero-img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== 首页栏目卡片 ===== */
.topics-section, .recent-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 24px;
}

.topics-section h2, .recent-section h2 {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
}

.topics-section hr, .recent-section hr {
  width: 40px;
  height: 3px;
  background: var(--mint);
  border: none;
  border-radius: 2px;
  margin-bottom: 28px;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.topic-card {
  background: var(--sand-light);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  border-bottom: 4px solid var(--mint);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
}

.topic-card-inner {
  padding: 24px;
}

.topic-card h3 {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.topic-card h3 a { color: var(--ink); }
.topic-card h3 a:hover { color: var(--mint-dark); }

.topic-card hr {
  width: 32px;
  height: 2px;
  background: var(--mint);
  border: none;
  margin: 8px 0;
}

.topic-desc {
  font-size: 0.88rem;
  color: var(--ink-mute);
  line-height: 1.6;
  margin-bottom: 14px;
}

.topic-kids {
  margin-bottom: 14px;
}
.topic-kids li {
  font-size: 0.84rem;
  margin-bottom: 4px;
  padding-left: 10px;
  position: relative;
}
.topic-kids li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--mint);
}
.topic-kids li a { color: var(--ink-soft); }
.topic-kids li a:hover { color: var(--mint-dark); }

.card-cta {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--mint-dark);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.card-cta:hover { color: var(--terracotta); }

/* ===== 近期文章列表 ===== */
.recent-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  counter-reset: recent-counter;
}

.recent-item {
  background: var(--warm-white);
  border-radius: var(--radius-sm);
  border-bottom: 3px solid var(--sand-dark);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), border-color var(--transition);
}
.recent-item:hover {
  transform: translateX(4px);
  border-color: var(--mint);
}

.recent-item a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  min-height: 44px;
  color: var(--ink-soft);
}
.recent-item a:hover { color: var(--ink); }

.recent-title {
  font-weight: 600;
  font-size: 0.95rem;
  flex: 1;
}

.recent-date {
  font-size: 0.78rem;
  color: var(--ink-mute);
  white-space: nowrap;
}

/* ===== 栏目文章列表 ===== */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 24px;
}

.article-card {
  background: var(--sand-light);
  border-radius: var(--radius-card);
  border-bottom: 4px solid var(--sand-dark);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.article-card:hover {
  transform: translateY(-3px);
  border-color: var(--mint);
  box-shadow: var(--shadow-soft);
}

.article-card > a {
  display: flex;
  gap: 0;
  color: var(--ink);
}

.card-img {
  flex-shrink: 0;
  width: 160px;
  overflow: hidden;
}

.card-img img, .card-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.card-body {
  padding: 20px;
  flex: 1;
}
.card-body h3 {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}
.card-body p {
  font-size: 0.88rem;
  color: var(--ink-mute);
  line-height: 1.6;
  margin-bottom: 10px;
}
.card-date {
  font-size: 0.78rem;
  color: var(--mint-dark);
}

/* ===== 标签文章列表 ===== */
.tag-article-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
}

.tag-article-list li {
  background: var(--warm-white);
  border-radius: var(--radius-sm);
  border-bottom: 3px solid var(--sand-dark);
  box-shadow: var(--shadow-card);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  transition: border-color var(--transition), transform var(--transition);
}
.tag-article-list li:hover {
  border-color: var(--mint);
  transform: translateX(3px);
}

.tag-article-list li a {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--ink-soft);
  flex: 1;
  min-height: 40px;
  display: flex;
  align-items: center;
}
.tag-article-list li a:hover { color: var(--mint-dark); }
.tag-article-list li small {
  font-size: 0.78rem;
  color: var(--ink-mute);
  white-space: nowrap;
}

/* ===== page-content ===== */
.page-content {
  padding-top: 40px;
  padding-bottom: 0;
}

/* ===== hr 通用 ===== */
h2 + hr, h3 + hr {
  width: 40px;
  height: 3px;
  background: var(--mint);
  border: none;
  border-radius: 2px;
  margin: 8px 0 18px;
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--ink);
  padding: 28px 24px;
  text-align: center;
}

.site-footer p,
.footer-brand {
  font-size: 0.9rem;
  color: var(--sand);
  margin-bottom: 8px;
}

.footer-brand a {
  color: var(--mint);
  margin: 0 4px;
}
.footer-brand a:hover { color: var(--mint-light); }

.site-footer small,
.footer-copy {
  font-size: 0.78rem;
  color: var(--ink-mute);
  display: block;
}

/* ===== Stagger 动画 ===== */
@media (prefers-reduced-motion: no-preference) {
  .stagger-item {
    opacity: 0;
    transform: translateY(20px);
    animation: staggerIn 0.5s ease-out forwards;
    animation-delay: calc(var(--i, 0) * 0.08s);
  }

  @keyframes staggerIn {
    to { opacity: 1; transform: translateY(0); }
  }

  .topic-card {
    animation: fadeUp 0.5s ease-out both;
    animation-delay: calc(var(--i, 0) * 0.1s);
  }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .hero-copy h1 {
    animation: slideRight 0.6s ease-out both;
  }

  @keyframes slideRight {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
  }

  .hero-media .hero-img, .hero-media .hero-placeholder {
    animation: scaleIn 0.8s ease-out both;
  }

  @keyframes scaleIn {
    from { transform: scale(1.04); }
    to { transform: scale(1); }
  }
}

@media (prefers-reduced-motion: reduce) {
  .stagger-item { opacity: 1; transform: none; animation: none; }
  .topic-card { animation: none; }
  .hero-copy h1 { animation: none; }
  .hero-media .hero-img, .hero-media .hero-placeholder { animation: none; }
}

/* ===== 响应式断点 ===== */
@media (max-width: 900px) {
  .content-section {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .sidebar-left {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 16px;
  }
  .sidebar-widget {
    flex: 1 1 200px;
    min-width: 180px;
  }
  .hero-section {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .hero-media {
    height: 40vw;
    min-height: 220px;
  }
  .hero-copy {
    padding: 32px 28px;
  }
  .topics-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
  .article-card > a {
    flex-direction: column;
  }
  .card-img {
    width: 100%;
    height: 160px;
  }
}

@media (max-width: 600px) {
  .brand-row { padding: 10px 16px; }
  .brand-tagline { display: none; }
  .menu-row { padding: 0 12px; }
  .main-nav p a { padding: 10px 8px; font-size: 0.78rem; }
  .hero-copy { padding: 24px 20px; gap: 12px; }
  .hero-copy h1 { font-size: 1.4rem; }
  .topic-hero, .tag-hero, .about-hero, .privacy-hero, .article-top, .default-hero {
    padding: 32px 20px 24px;
  }
  .content-section { padding: 24px 16px 40px; }
  .topics-section, .recent-section { padding: 28px 16px; }
  .sidebar-left { flex-direction: column; }
  .sidebar-widget { min-width: unset; }
  .topics-grid { grid-template-columns: 1fr; }
  .fullscreen-nav nav p a { font-size: 1.1rem; padding: 10px 16px; }
  .recent-item a { flex-direction: column; align-items: flex-start; gap: 4px; }
}