/* ========================================
   马克数据导航 - 白色背景 + 青蓝色强调风格
   马克数据导航网站主样式表
   ======================================== */

/* ========================================
   1. CSS 变量定义
   ======================================== */
:root {
  /* 主色调 - 青蓝色系（仅用于强调） */
  --color-primary: rgb(33, 143, 196);
  --color-primary-dark: rgb(25, 115, 160);
  --color-primary-darker: rgb(20, 95, 135);

  /* 背景色 - 浅蓝色系 */
  --color-bg-main: #e6f2fe;
  --color-bg-section: #e6f2fe;
  --color-bg-card: #ffffff;

  /* 兼容旧变量（用于Hero和导航栏） */
  --color-bg-dark: rgb(25, 115, 160);
  --color-bg-darker: rgb(20, 95, 135);

  /* 文字色 */
  --color-text-light: #ffffff;
  --color-text-light-muted: rgba(255, 255, 255, 0.7);
  --color-accent: rgb(33, 143, 196);

  /* 分类颜色 */
  --color-mark: #c94043;        /* 马克数据 - 朱砂红 */
  --color-ai: #8b5cf6;          /* AI工具 - 紫色 */
  --color-journal: #3b82f6;     /* 学术期刊 - 蓝色 */
  --color-search: #06b6d4;      /* 学术检索 - 青色 */
  --color-paper: #f59e0b;       /* 工作论文 - 橙色 */
  --color-write: #ec4899;       /* 写作查重 - 粉色 */
  --color-platform: #10b981;    /* 综合平台 - 绿色 */
  --color-stats: #6366f1;       /* 国内统计 - 靛蓝 */
  --color-industry: #14b8a6;    /* 行业数据 - 青绿 */
  --color-company: #f97316;     /* 企业数据 - 橙红 */
  --color-survey: #a855f7;      /* 微观调查 - 紫罗兰 */
  --color-finance: #eab308;     /* 金融交易所 - 金黄 */
  --color-patent: #84cc16;      /* 专利知产 - 黄绿 */
  --color-geo: #22c55e;         /* 地理空间 - 绿色 */
  --color-news: #ef4444;        /* 新闻舆情 - 红色 */
  --color-tool: #64748b;        /* 方法工具 - 石板灰 */
  --color-intl: #0ea5e9;        /* 国际组织 - 天蓝 */
  --color-local-stats: #7c3aed; /* 地方统计局 - 紫色 */
  --color-local-gov: #059669;   /* 地方政府网 - 深绿 */

  /* 辅助色 */
  --color-text-primary: #2c2c2c;
  --color-text-secondary: #6b7280;
  --color-border: #e5e7eb;
  --color-shadow: rgba(0, 0, 0, 0.1);

  /* 间距 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* 阴影 */
  --shadow-sm: 0 2px 8px var(--color-shadow);
  --shadow-md: 0 4px 16px var(--color-shadow);
  --shadow-lg: 0 8px 32px var(--color-shadow);

  /* 容器最大宽度 */
  --container-max-width: 1400px;
}

/* ========================================
   2. 字体引入
   ======================================== */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&family=Noto+Serif+SC:wght@400;600;700&display=swap');

/* ========================================
   3. 现代 CSS 重置
   ======================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-main);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ========================================
   4. 布局系统
   ======================================== */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ========================================
   5. 导航栏样式
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(33, 143, 196, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-normal);
}

.navbar--scrolled {
  background: rgba(25, 115, 160, 0.98);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.navbar__logo img {
  height: 36px;
  width: auto;
}

.navbar__nav {
  display: none;
  align-items: center;
  gap: var(--spacing-lg);
}

.navbar__link {
  font-size: 0.95rem;
  color: var(--color-text-light);
  position: relative;
  padding: var(--spacing-xs) 0;
}

.navbar__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: white;
  transition: width var(--transition-normal);
}

.navbar__link:hover {
  color: var(--color-text-light);
}

.navbar__link:hover::after {
  width: 100%;
}

/* 当前页面的导航链接高亮 */
.navbar__link--active {
  font-weight: 600;
  color: var(--color-text-light);
}

.navbar__link--active::after {
  width: 100%;
  height: 3px;
  background: white;
}

.navbar__wechat {
  position: relative;
}

.navbar__wechat-popup {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--spacing-sm);
  padding: var(--spacing-md);
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-normal);
  text-align: center;
  min-width: 180px;
}

.navbar__wechat:hover .navbar__wechat-popup {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.navbar__wechat-popup img {
  width: 150px;
  height: 150px;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-xs);
}

.navbar__wechat-popup span {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* 移动端菜单按钮 */
.navbar__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
}

.navbar__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-light);
  transition: all var(--transition-fast);
}

.navbar__toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.navbar__toggle.active span:nth-child(2) {
  opacity: 0;
}

.navbar__toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* 移动端菜单 */
.mobile-menu {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-primary-dark);
  padding: var(--spacing-lg);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  overflow-y: auto;
  z-index: 999;
}

.mobile-menu.active {
  transform: translateX(0);
}

.mobile-menu__link {
  display: block;
  padding: var(--spacing-md) 0;
  font-size: 1.1rem;
  color: var(--color-text-light);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.mobile-menu__link--active {
  font-weight: 600;
  background: rgba(255, 255, 255, 0.1);
  padding-left: var(--spacing-md);
  border-left: 3px solid white;
}

/* 桌面端显示导航 */
@media (min-width: 768px) {
  .navbar__nav {
    display: flex;
  }

  .navbar__toggle {
    display: none;
  }

  .mobile-menu {
    display: none;
  }
}

/* ========================================
   6. Hero 区域
   ======================================== */
.hero {
  padding-top: calc(64px + var(--spacing-xl));
  padding-bottom: var(--spacing-lg);
  text-align: center;
  background: var(--color-bg-section);
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.hero__logo {
  width: 70px;
  height: auto;
  margin: 0 auto var(--spacing-sm);
}

.hero__title {
  font-family: 'Noto Serif SC', serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: var(--spacing-xs);
  letter-spacing: 0.1em;
}

.hero__subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
  font-weight: 300;
}

@media (min-width: 768px) {
  .hero__title {
    font-size: 2.5rem;
  }

  .hero__logo {
    width: 80px;
  }
}

/* ========================================
   6.1 搜索框样式
   ======================================== */
.search-box {
  position: relative;
  max-width: 500px;
  margin: var(--spacing-md) auto 0;
}

.search-box__input {
  width: 100%;
  padding: 12px 20px 12px 48px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--color-text-primary);
  background: white;
  border: 1px solid rgba(33, 143, 196, 0.2);
  border-radius: 30px;
  outline: none;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 12px rgba(33, 143, 196, 0.1);
}

.search-box__input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 4px 20px rgba(33, 143, 196, 0.15);
}

.search-box__input::placeholder {
  color: var(--color-text-secondary);
}

.search-box__icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  min-width: 20px;
  min-height: 20px;
  max-width: 20px;
  max-height: 20px;
  color: var(--color-text-secondary);
  pointer-events: none;
  flex-shrink: 0;
}

.search-box__results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  border: 1px solid rgba(0, 0, 0, 0.06);
  max-height: 400px;
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  z-index: 1001;
}

.search-box__results.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.search-box__item {
  display: block;
  padding: 10px 16px;
  cursor: pointer;
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
  transition: background var(--transition-fast);
  text-align: left;
}

.search-box__item:last-child {
  border-bottom: none;
}

.search-box__item:hover,
.search-box__item.selected {
  background: rgba(0, 0, 0, 0.03);
}

.search-box__item-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: 2px;
  text-align: left;
}

.search-box__item-category {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  opacity: 0.8;
  text-align: left;
}

.search-box__item-desc {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin: 2px 0;
  text-align: left;
  opacity: 0.9;
  line-height: 1.4;
}

.search-box__empty {
  padding: 16px;
  text-align: left;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  opacity: 0.7;
}

/* ========================================
   7. 主内容区域
   ======================================== */
.main-content {
  padding: var(--spacing-lg) 0 var(--spacing-xxl);
  background-color: var(--color-bg-section);
}

/* 桌面端有侧边栏时的内容区左边距 */
@media (min-width: 1024px) {
  .main-content {
    margin-left: 140px;
  }
}

/* ========================================
   7.1 左侧快速定位侧边栏
   ======================================== */
.sidebar {
  display: none;
}

@media (min-width: 1024px) {
  .sidebar {
    display: block;
    position: fixed;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 130px;
    padding: var(--spacing-sm);
    z-index: 100;
    background: var(--color-bg-card);
    border-right: 1px solid #e5e7eb;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.05);
  }

  .sidebar__nav {
    display: flex;
    flex-direction: column;
    gap: 1px;
  }

  .sidebar__link {
    display: block;
    padding: 6px 10px;
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    border-left: 2px solid transparent;
    transition: all var(--transition-fast);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .sidebar__link:hover {
    color: var(--color-primary);
    background: rgba(33, 143, 196, 0.05);
  }

  .sidebar__link.active {
    color: var(--color-primary);
    background: rgba(33, 143, 196, 0.1);
    border-left-color: var(--color-primary);
    font-weight: 500;
  }

}

/* ========================================
   8. 分类区域 - 新样式
   ======================================== */
.categories-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* 分类区块 */
.category-section {
  opacity: 1;
}

.category-section.animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* 分类标题 - 深色文字 + 青蓝色装饰 */
.category-title {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text-primary);
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 12px;
  padding-left: 4px;
}

.category-title::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 2px;
  transform: rotate(45deg);
}

/* ========================================
   9. 导航卡片网格
   ======================================== */
.nav-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

@media (max-width: 1200px) {
  .nav-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .nav-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   10. 导航卡片样式
   ======================================== */
.nav-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--color-bg-card);
  border: 1px solid #e5e7eb;
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: 0.9rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  position: relative;
}

.nav-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(33, 143, 196, 0.15);
}

/* 导航卡片 Tooltip */
.nav-card[data-desc]::after {
  content: attr(data-desc);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  padding: 8px 12px;
  background: rgba(0, 0, 0, 0.85);
  color: white;
  font-size: 0.8rem;
  font-weight: 400;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  z-index: 1000;
  pointer-events: none;
}

.nav-card[data-desc]::before {
  content: '';
  position: absolute;
  bottom: calc(100% + 2px);
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: rgba(0, 0, 0, 0.85);
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  z-index: 1000;
  pointer-events: none;
}

.nav-card[data-desc]:hover::after,
.nav-card[data-desc]:hover::before {
  opacity: 1;
  visibility: visible;
}

/* 字母图标 */
.nav-card__letter {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 14px;
  flex-shrink: 0;
}

/* Logo 图标 */
.nav-card__icon {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  object-fit: contain;
  flex-shrink: 0;
  background: #f5f5f5;
}

.nav-card__icon[src=""],
.nav-card__icon:not([src]),
.nav-card__icon.error {
  display: none;
}

.nav-card__icon.error + .nav-card__letter {
  display: flex;
}

.nav-card__name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 子分类标签 - 在网格中占据整行 */
.nav-grid__tag {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 4px 4px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.nav-grid__tag::before {
  content: '#';
  color: var(--color-primary);
}

/* ========================================
   11. 页脚样式
   ======================================== */
.footer {
  background: var(--color-primary);
  color: var(--color-text-light);
  padding: var(--spacing-lg) 0;
  text-align: center;
}

.footer__copyright {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.8);
}

/* ========================================
   12. 动画定义
   ======================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* 滚动触发动画 - 由JS控制 */
.scroll-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.scroll-animate.animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* 分类交错动画延迟（第1个子元素是常用区块，从第2个开始是正式分类） */
#category-frequent { transition-delay: 0s; }
.category-section:nth-child(2) { transition-delay: 0.05s; }
.category-section:nth-child(3) { transition-delay: 0.1s; }
.category-section:nth-child(4) { transition-delay: 0.15s; }
.category-section:nth-child(5) { transition-delay: 0.2s; }
.category-section:nth-child(6) { transition-delay: 0.25s; }
.category-section:nth-child(7) { transition-delay: 0.3s; }
.category-section:nth-child(8) { transition-delay: 0.35s; }
.category-section:nth-child(9) { transition-delay: 0.4s; }
.category-section:nth-child(10) { transition-delay: 0.45s; }
.category-section:nth-child(11) { transition-delay: 0.5s; }
.category-section:nth-child(n+12) { transition-delay: 0.55s; }

/* ========================================
   13. 工具类
   ======================================== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========================================
   14. 桌面端侧边栏存在时的容器调整
   ======================================== */
@media (min-width: 1024px) {
  .main-content .container {
    max-width: calc(var(--container-max-width) - 140px);
  }
}

/* ========================================
   15. 打印样式
   ======================================== */
@media print {
  .navbar,
  .navbar__toggle,
  .mobile-menu,
  .sidebar {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .hero {
    padding-top: var(--spacing-lg);
    background: #f5f5f5;
  }

  .hero__title,
  .hero__subtitle {
    color: black;
  }

  .category-title {
    color: black;
  }

  .nav-card {
    border: 1px solid #ddd;
  }
}

/* ========================================
   16. 兼容旧样式 (保留JS兼容性)
   ======================================== */
.category-card {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.category-card.animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   期刊导航页面样式
   ======================================== */

/* Hero 区域 - 期刊页面 */
.hero--journals {
  padding: 4rem 2rem 3rem;
  min-height: auto;
}

.search-box--journals {
  max-width: 600px;
}

/* 期刊容器 */
.journals-container {
  display: flex;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 2rem 1rem;
  gap: 2rem;
  min-height: 60vh;
}

/* 左侧边栏 */
.journals-sidebar {
  width: 260px;
  flex-shrink: 0;
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
}

.journals-sidebar__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--color-border);
}

.journals-sidebar__header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.journals-sidebar__count {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.journals-sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.journals-sidebar__link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
}

.journals-sidebar__link:hover {
  background: var(--color-bg-main);
  border-left-color: var(--color-primary);
}

.journals-sidebar__link.active {
  background: var(--color-primary);
  color: var(--color-text-light);
  font-weight: 500;
  border-left-color: var(--color-primary-darker);
}

.journals-sidebar__subject {
  font-size: 0.9375rem;
}

.journals-sidebar__number {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* 主内容区 */
.journals-main {
  flex: 1;
  min-width: 0;
}

/* 顶部标题栏 */
.journals-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--color-border);
}

.journals-header__info {
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.journals-header__info h2 {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.journals-header__count {
  font-size: 1rem;
  color: var(--color-text-secondary);
}

.journals-header__sort {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.journals-header__sort label {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.journals-header__sort select {
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  font-size: 0.9375rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.journals-header__sort select:hover {
  border-color: var(--color-primary);
}

.journals-header__sort select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(33, 143, 196, 0.1);
}

/* 期刊网格 */
.journal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 1.5rem;
}

/* 期刊卡片 - 横向布局 */
.journal-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 1.25rem;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
  display: flex;
  flex-direction: row;
  gap: 1.25rem;
  position: relative;
}

.journal-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

/* Logo列（包裹Logo + 官网链接） */
.journal-card__logo-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  width: 80px;
}

/* Logo区域 */
.journal-card__logo-wrapper {
  flex-shrink: 0;
  width: 80px;
  height: 105px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.journal-card__logo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.journal-card__logo-fallback {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

/* 右侧内容区 */
.journal-card__content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.journal-card__header {
  margin-bottom: 0.75rem;
}

.journal-card__name {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 0.4rem;
  line-height: 1.4;
}

.journal-card--has-badges .journal-card__name {
  padding-right: 8rem;
}

/* 元数据行 */
.journal-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
  margin-top: 0.25rem;
}

.journal-card__subject {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  background: var(--color-bg-main);
  color: var(--color-primary);
  font-size: 0.75rem;
  border-radius: 999px;
  font-weight: 500;
}

.journal-card__frequency {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  padding: 0.15rem 0.5rem;
  background: #f3f4f6;
  border-radius: 4px;
}

.journal-card__impact {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.journal-card__impact strong {
  font-size: 1rem;
  font-weight: 700;
  color: #d97706;
  font-family: 'Courier New', monospace;
}

/* 学术徽章 - 卡片右上角 */
.journal-card__badges {
  position: absolute;
  top: 0.625rem;
  right: 0.625rem;
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
  justify-content: flex-end;
  max-width: 55%;
  z-index: 1;
}

.journal-badge {
  display: inline-block;
  padding: 0.2rem 0.45rem;
  font-size: 0.6875rem;
  font-weight: 600;
  border-radius: 3px;
  line-height: 1;
  white-space: nowrap;
}

.journal-badge--cssci   { background: #fef3c7; color: #92400e; border: 1px solid #fde68a; }
.journal-badge--pku     { background: #dbeafe; color: #1e40af; border: 1px solid #bfdbfe; }
.journal-badge--ami     { background: #e0e7ff; color: #4338ca; border: 1px solid #c7d2fe; }
.journal-badge--cscd    { background: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
.journal-badge--sci     { background: #fce7f3; color: #9f1239; border: 1px solid #fbcfe8; }
.journal-badge--default { background: #f3f4f6; color: #374151; border: 1px solid #e5e7eb; }

.journal-card__body {
  flex: 1;
}

.journal-card__publisher,
.journal-card__topic,
.journal-card__issn {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.35rem;
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.journal-card__issn {
  font-family: 'Courier New', monospace;
  font-size: 0.75rem;
}

.journal-card__website {
  display: inline-block;
  color: var(--color-primary);
  text-decoration: none;
  font-size: 0.7rem;
  font-weight: 500;
  margin-top: 0.4rem;
  text-align: center;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.journal-card__website:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

.journal-card__no-website {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-top: 0.4rem;
  text-align: center;
  white-space: nowrap;
}

/* 加载指示器 */
.loading-indicator {
  text-align: center;
  padding: 3rem 0;
}

.loading-spinner {
  display: inline-block;
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-indicator p {
  margin-top: 1rem;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
}

.empty-state::before {
  content: '';
  display: block;
  width: 64px;
  height: 64px;
  margin: 0 auto 1.5rem;
  border: 3px solid var(--color-border);
  border-radius: 50%;
  position: relative;
  background:
    linear-gradient(var(--color-border), var(--color-border)) center/2px 20px no-repeat,
    linear-gradient(var(--color-border), var(--color-border)) center/20px 2px no-repeat;
  transform: rotate(45deg);
  opacity: 0.5;
}

.empty-state p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

.empty-state p.empty-state__hint {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  opacity: 0.7;
  margin-top: 0.5rem;
}

/* 分页控件 */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  margin-top: 3rem;
  padding: 2rem 0;
}

.pagination__btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-bg-main);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.pagination__btn:hover:not(:disabled) {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}

.pagination__btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pagination__info {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  min-width: 200px;
  text-align: center;
}

/* 搜索结果样式增强 */
.search-box__item-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  margin-top: 0.25rem;
}

.search-box__item-subject {
  color: var(--color-primary);
  font-weight: 500;
}

.search-box__item--active {
  background: var(--color-bg-main);
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .journals-sidebar {
    width: 220px;
  }
}

@media (max-width: 768px) {
  .journals-container {
    flex-direction: column;
    padding: 1rem;
  }

  .journals-sidebar {
    width: 100%;
    position: static;
    margin-bottom: 1.5rem;
  }

  .journals-sidebar__nav {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 0.5rem;
    max-height: none;
    overflow-y: visible;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .journals-sidebar__nav::-webkit-scrollbar {
    display: none;
  }

  .journals-sidebar__link {
    white-space: nowrap;
    flex-shrink: 0;
    border-left: none;
    border-bottom: 3px solid transparent;
    padding: 0.5rem 1rem;
  }

  .journals-sidebar__link.active {
    border-bottom-color: var(--color-primary-darker);
    border-left: none;
  }

  .journals-sidebar__link:hover {
    border-left: none;
    border-bottom-color: var(--color-primary);
  }

  .journals-sidebar__number {
    display: none;
  }

  .journals-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .journals-header__info {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .journal-grid {
    grid-template-columns: 1fr;
  }

  .journal-card__logo-col {
    width: 60px;
  }

  .journal-card__logo-wrapper {
    width: 60px;
    height: 78px;
  }

  .journal-card--has-badges .journal-card__name {
    padding-right: 0;
  }

  .journal-card__badges {
    position: static;
    justify-content: flex-start;
    max-width: 100%;
    margin-bottom: 0.5rem;
  }

  .hero--journals {
    padding: 3rem 1.5rem 2rem;
  }
}

@media (max-width: 480px) {
  .journals-header__info h2 {
    font-size: 1.5rem;
  }

  .journal-card {
    padding: 1rem;
  }

  .pagination {
    flex-direction: column;
    gap: 1rem;
  }

  .pagination__info {
    font-size: 0.875rem;
    min-width: auto;
  }

  .pagination__btn {
    width: 100%;
    justify-content: center;
  }
}

/* ========================================
   常用网站功能
   ======================================== */

/* 清除按钮 */
.frequent-clear {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  cursor: pointer;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}
.frequent-clear:hover {
  color: #ef4444;
}

/* 点击次数标签 */
.nav-card__clicks {
  font-size: 0.7rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

/* 标题旁的计数 */
.frequent-count {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-weight: 400;
}