/* ============================================================
   首页新样式 - 现代化设计
   配色方案：蓝色主色调 + 橙色辅助色
   ============================================================ */

/* 全局变量 */
:root {
  --primary: #4F46E5;
  --primary-light: #818CF8;
  --primary-dark: #3730A3;
  --secondary: #F59E0B;
  --secondary-light: #FCD34D;
  --success: #10B981;
  --danger: #EF4444;
  --bg: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-dark: #1E293B;
  --text: #1E293B;
  --text-secondary: #64748B;
  --text-light: #94A3B8;
  --border: #E2E8F0;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
}

/* ============================================================
   顶部导航优化
   ============================================================ */
.header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  box-shadow: 0 4px 20px rgba(79, 70, 229, 0.3);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 70px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
}

.logo a {
  color: white;
  text-decoration: none;
  transition: var(--transition);
}

.logo a:hover {
  opacity: 0.9;
}

.logo-desc {
  color: rgba(255, 255, 255, 0.8);
  font-size: 13px;
  display: none;
}

@media (min-width: 768px) {
  .logo-desc {
    display: inline;
  }
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav a {
  color: rgba(255, 255, 255, 0.9);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
}

.nav a:hover,
.nav a.nav-active {
  background: rgba(255, 255, 255, 0.15);
  color: white;
}

.nav-search {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 20px;
  padding: 6px 16px;
  margin-left: 12px;
  transition: var(--transition);
}

.nav-search:focus-within {
  background: rgba(255, 255, 255, 0.25);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.2);
}

.nav-search input {
  background: transparent;
  border: none;
  color: white;
  outline: none;
  width: 180px;
  font-size: 14px;
}

.nav-search input::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.nav-search button {
  background: transparent;
  border: none;
  color: white;
  cursor: pointer;
  font-size: 16px;
  padding: 4px 8px;
}

.admin-link {
  background: var(--secondary) !important;
  color: white !important;
  border-radius: 20px !important;
  padding: 6px 16px !important;
  font-size: 13px !important;
  font-weight: 600 !important;
}

.admin-link:hover {
  background: var(--secondary-light) !important;
  transform: translateY(-1px);
}

/* ============================================================
   公告栏
   ============================================================ */
.announcements-bar {
  background: linear-gradient(90deg, #FEF3C7 0%, #FDE68A 100%);
  padding: 12px 0;
  text-align: center;
  font-size: 14px;
  color: var(--text);
  border-bottom: 2px solid var(--secondary);
}

.announcement-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 20px;
}

.announcement-icon {
  font-size: 16px;
}

.announcement-text {
  font-weight: 500;
}

.announcement-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 18px;
  padding: 0 4px;
  margin-left: 12px;
}

/* ============================================================
   Hero区
   ============================================================ */
.hero-section {
  background: var(--bg);
  padding: 30px 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 24px;
  align-items: start;
}

@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }
}

/* 轮播图 */
.hero-carousel {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--bg-card);
}

.carousel-container {
  position: relative;
  width: 100%;
  padding-top: 40%; /* 控制轮播图高度比例 */
  overflow: hidden;
}

.carousel-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.5s ease;
  cursor: pointer;
}

.carousel-slide.active {
  opacity: 1;
}

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

.carousel-slide-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 40px 30px 20px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
  color: white;
}

.carousel-slide-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.carousel-slide-desc {
  font-size: 14px;
  opacity: 0.9;
}

.carousel-empty {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 100%);
  color: var(--primary);
  font-size: 16px;
  border-radius: var(--radius);
  text-align: center;
  padding: 20px;
}

.carousel-dots {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 10;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  padding: 0;
}

.carousel-dot.active {
  background: white;
  width: 24px;
  border-radius: 5px;
}

.carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.5);
  color: white;
  border: none;
  font-size: 24px;
  cursor: pointer;
  transition: var(--transition);
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
}

.carousel-arrow:hover {
  background: rgba(0, 0, 0, 0.7);
  transform: translateY(-50%) scale(1.1);
}

.carousel-prev {
  left: 16px;
}

.carousel-next {
  right: 16px;
}

/* 右侧快速入口 */
.hero-sidebar {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.sidebar-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary);
}

.quick-categories {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.quick-category-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 12px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text);
  transition: var(--transition);
  border: 2px solid transparent;
}

.quick-category-item:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.quick-category-icon {
  font-size: 32px;
  line-height: 1;
}

.quick-category-name {
  font-size: 14px;
  font-weight: 600;
  text-align: center;
}

.quick-category-count {
  font-size: 12px;
  color: var(--text-secondary);
}

/* 今日统计 */
.today-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.stat-item {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  padding: 16px;
  border-radius: var(--radius-sm);
  text-align: center;
  color: white;
}

.stat-num {
  display: block;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.2;
}

.stat-label {
  font-size: 13px;
  opacity: 0.9;
}

/* ============================================================
   通用区块样式
   ============================================================ */
.section {
  padding: 40px 0;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-more {
  color: var(--primary);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
}

.section-more:hover {
  color: var(--primary-dark);
  gap: 4px;
}

/* 筛选标签 */
.filter-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-tag {
  padding: 6px 16px;
  border-radius: 20px;
  border: 2px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 500;
}

.filter-tag:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.filter-tag.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

/* ============================================================
   精品推荐网格
   ============================================================ */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.featured-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
  border: 2px solid transparent;
}

.featured-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.featured-card-img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background: var(--bg);
}

.featured-card-body {
  padding: 16px;
}

.featured-card-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.featured-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--text-secondary);
}

.featured-card-tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--primary);
  color: white;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
}

/* ============================================================
   最新更新列表
   ============================================================ */
.latest-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

.latest-item {
  display: flex;
  gap: 16px;
  padding: 16px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
  border: 2px solid transparent;
}

.latest-item:hover {
  border-color: var(--primary-light);
  transform: translateX(4px);
}

.latest-item-img {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  background: var(--bg);
  flex-shrink: 0;
}

.latest-item-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.latest-item-title {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 8px;
}

.latest-item-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-secondary);
}

.latest-item-date {
  color: var(--text-light);
}

.latest-item-category {
  padding: 2px 8px;
  background: var(--bg);
  border-radius: 4px;
  font-weight: 500;
}

/* 加载更多 */
.load-more {
  text-align: center;
  margin-top: 32px;
}

.btn-load-more {
  padding: 12px 40px;
  background: var(--bg-card);
  border: 2px solid var(--primary);
  color: var(--primary);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-load-more:hover {
  background: var(--primary);
  color: white;
}

/* ============================================================
   排行榜双栏
   ============================================================ */
.rankings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

@media (max-width: 768px) {
  .rankings-grid {
    grid-template-columns: 1fr;
  }
}

.ranking-block,
.recommend-block {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.ranking-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--border);
}

.ranking-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin: 0;
}

.ranking-header select {
  padding: 6px 12px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  outline: none;
}

.ranking-header select:focus {
  border-color: var(--primary);
}

/* 排行榜列表 */
.ranking-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ranking-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
}

.ranking-item:hover {
  background: var(--primary-light);
  color: white;
}

.ranking-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
}

.ranking-num.top1 {
  background: linear-gradient(135deg, #F59E0B 0%, #FCD34D 100%);
}

.ranking-num.top2 {
  background: linear-gradient(135deg, #94A3B8 0%, #CBD5E1 100%);
}

.ranking-num.top3 {
  background: linear-gradient(135deg, #D97706 0%, #F59E0B 100%);
}

.ranking-item-img {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  background: var(--bg-card);
  flex-shrink: 0;
}

.ranking-item-info {
  flex: 1;
  min-width: 0;
}

.ranking-item-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ranking-item-category {
  font-size: 12px;
  color: var(--text-secondary);
}

.ranking-item:hover .ranking-item-category {
  color: rgba(255, 255, 255, 0.8);
}

/* ============================================================
   分类资源区
   ============================================================ */
.category-block {
  margin-bottom: 40px;
}

.category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--primary);
}

.category-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin: 0;
}

.category-more {
  color: var(--primary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}

.category-more:hover {
  color: var(--primary-dark);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.category-grid .resource-card {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
  border: 2px solid transparent;
}

.category-grid .resource-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.category-grid .resource-card-img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  background: var(--bg);
}

.category-grid .resource-card-body {
  padding: 12px;
}

.category-grid .resource-card-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.category-grid .resource-card-meta {
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ============================================================
   页脚优化
   ============================================================ */
.footer {
  background: var(--bg-dark);
  color: white;
  padding: 60px 0 30px;
  margin-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

.footer-col h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 20px;
  color: white;
}

.footer-col p {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
  font-size: 14px;
}

.footer-col a {
  display: block;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  padding: 6px 0;
  font-size: 14px;
  transition: var(--transition);
}

.footer-col a:hover {
  color: var(--secondary);
  padding-left: 8px;
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 14px;
}

/* ============================================================
   回到顶部按钮
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  border: none;
  font-size: 20px;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  z-index: 1000;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-4px);
}

/* ============================================================
   加载状态
   ============================================================ */
.loading-container {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
  font-size: 16px;
}

.error-container {
  text-align: center;
  padding: 40px 20px;
  color: var(--danger);
  font-size: 15px;
  background: #FEE2E2;
  border-radius: var(--radius-sm);
  margin: 20px 0;
}

/* ============================================================
   响应式优化
   ============================================================ */
@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 20px;
  }

  .logo-area {
    width: 100%;
    justify-content: space-between;
  }

  .menu-toggle {
    display: block;
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
  }

  .nav {
    display: none;
    width: 100%;
    flex-direction: column;
    padding-top: 16px;
    gap: 4px;
  }

  .nav.active {
    display: flex;
  }

  .nav a {
    width: 100%;
    text-align: center;
  }

  .nav-search {
    margin-left: 0;
    width: 100%;
  }

  .nav-search input {
    width: 100%;
  }

  .hero-inner {
    grid-template-columns: 1fr;
  }

  .carousel-container {
    padding-top: 56.25%; /* 16:9 比例 */
  }

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

  .latest-list {
    grid-template-columns: 1fr;
  }

  .category-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }

  .section-title {
    font-size: 20px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .quick-categories {
    grid-template-columns: 1fr 1fr;
  }

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