/* ========================================
   蔚蓝家园 - 海洋保护科普网站 全局样式
   ======================================== */

/* === 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&family=Playfair+Display:wght@400;600;700&display=swap');

/* === CSS变量 === */
:root {
  /* 色彩系统 */
  --color-primary: #0077B6;
  --color-secondary: #00B4D8;
  --color-accent: #90E0EF;
  --color-bg-light: #377ac1;
  --color-bg-dark: #03045E;
  --color-text: #023047;
  --color-text-light: #FFFFFF;
  --color-text-muted: #6B7280;
  --color-coral: #FF6B6B;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  
  /* 间距系统 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* 阴影 */
  --shadow-sm: 0 2px 4px rgba(0, 119, 182, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 119, 182, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 119, 182, 0.2);
  --shadow-xl: 0 16px 48px rgba(0, 119, 182, 0.25);
  
  /* 字体 */
  --font-display: 'Noto Serif SC', 'Playfair Display', serif;
  --font-body: 'Noto Sans SC', sans-serif;
}

/* === 重置样式 === */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: linear-gradient(180deg, #377ac1 0%, #BBDBFC 100%);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  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;
}

/* === 排版 === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-bg-dark);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

p {
  margin-bottom: var(--spacing-sm);
}

/* === 容器 === */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* === 导航栏 === */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: linear-gradient(180deg, rgba(3, 4, 94, 0.95) 0%, rgba(3, 4, 94, 0.85) 100%);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: var(--spacing-sm) 0;
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(3, 4, 94, 0.98);
  box-shadow: var(--shadow-lg);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.nav-logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.nav-logo-text {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-light);
}

.nav-logo-text span {
  color: var(--color-accent);
}

.nav-menu {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  color: var(--color-text-light);
  font-weight: 500;
  font-size: 1rem;
  transition: all var(--transition-fast);
  border-radius: var(--radius-md);
}

.nav-link:hover {
  color: var(--color-accent);
  background: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
  color: var(--color-accent);
}

.nav-arrow {
  font-size: 0.75rem;
  transition: transform var(--transition-fast);
}

.nav-item:hover .nav-arrow {
  transform: rotate(180deg);
}

/* 下拉菜单 */
.dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  min-width: 200px;
  background: rgba(3, 4, 94, 0.98);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-sm) 0;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.nav-item:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.dropdown-item {
  display: block;
  padding: var(--spacing-xs) var(--spacing-md);
  color: var(--color-text-light);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.dropdown-item:hover {
  background: rgba(0, 180, 216, 0.2);
  color: var(--color-accent);
  padding-left: var(--spacing-lg);
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--spacing-xs);
  cursor: pointer;
}

.nav-toggle span {
  width: 25px;
  height: 2px;
  background: var(--color-text-light);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* === Hero区域 === */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-slideshow {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1.5s ease-in-out;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

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

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    180deg,
    rgba(3, 4, 94, 0.4) 0%,
    rgba(3, 4, 94, 0.6) 50%,
    rgba(3, 4, 94, 0.8) 100%
  );
  z-index: 2;
}

/* 点击波纹特效 */
.ripple-effect {
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.ripple-effect::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  transform: translate(-50%, -50%);
  transition: width 0.6s ease-out, height 0.6s ease-out, opacity 0.6s ease-out;
  opacity: 0;
  pointer-events: none;
}

.ripple-effect:active::after {
  width: 300px;
  height: 300px;
  opacity: 1;
  transition: 0s;
}

.ripple-effect.clicked::after {
  animation: rippleClick 0.6s ease-out forwards;
}

@keyframes rippleClick {
  0% {
    width: 0;
    height: 0;
    opacity: 0.6;
  }
  100% {
    width: 300px;
    height: 300px;
    opacity: 0;
  }
}

/* Hero内容 */
.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  padding: var(--spacing-lg);
  max-width: 900px;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
  text-shadow: 2px 4px 20px rgba(0, 0, 0, 0.3);
  animation: fadeInUp 1s ease-out;
}

.hero-title span {
  color: var(--color-accent);
  position: relative;
}

.hero-title span::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-secondary));
  border-radius: 2px;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
  animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 1s ease-out 0.4s both;
}

/* 按钮样式 */
.btn {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
  color: var(--color-text-light);
  box-shadow: 0 4px 20px rgba(0, 180, 216, 0.4);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 180, 216, 0.5);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text-light);
  border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* 轮播指示器 */
.slideshow-indicators {
  position: absolute;
  bottom: 180px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--spacing-sm);
  z-index: 10;
}

.indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 2px solid transparent;
}

.indicator:hover {
  background: rgba(255, 255, 255, 0.6);
}

.indicator.active {
  background: var(--color-accent);
  border-color: var(--color-text-light);
  transform: scale(1.2);
}

/* === 区块样式 === */
.section {
  padding: var(--spacing-2xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  position: relative;
  display: inline-block;
  margin-bottom: var(--spacing-sm);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  border-radius: 2px;
}

.section-subtitle {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: var(--spacing-md) auto 0;
}

/* === 卡片网格 === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.card {
  background: var(--color-text-light);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.card-image {
  position: relative;
  height: 220px;
  overflow: hidden;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.card:hover .card-image img {
  transform: scale(1.1);
}

.card-badge {
  position: absolute;
  top: var(--spacing-sm);
  left: var(--spacing-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-primary);
  color: var(--color-text-light);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius-md);
}

.card-content {
  padding: var(--spacing-md);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
  color: var(--color-bg-dark);
}

.card-desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-sm);
  border-top: 1px solid rgba(0, 119, 182, 0.1);
}

.card-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: #377ac1;
  color: var(--color-text-light);
  font-size: 0.85rem;
  border-radius: var(--radius-md);
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-primary);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.card-link:hover {
  color: var(--color-secondary);
  gap: var(--spacing-sm);
}

/* === 特色区块 === */
.features {
  background: linear-gradient(180deg, #377ac1 0%, #BBDBFC 100%);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.feature-card {
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--color-text-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-md);
  background: linear-gradient(135deg, #377ac1, var(--color-accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.feature-desc {
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* === 页脚 === */
.footer {
  background: var(--color-bg-dark);
  color: var(--color-text-light);
  padding: var(--spacing-2xl) 0 var(--spacing-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.footer-logo-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.footer-logo-text {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
}

.footer-desc {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
}

.footer-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-accent);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-link {
  color: rgba(255, 255, 255, 0.7);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.footer-link:hover {
  color: var(--color-accent);
  padding-left: var(--spacing-xs);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
}

/* === 动画 === */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.fade-in-up {
  animation: fadeInUp 0.8s ease-out forwards;
}

/* === 页面特定样式 === */

/* 海洋生物页面 */
.page-header {
  background: linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-primary) 100%);
  padding: calc(80px + var(--spacing-2xl)) 0 var(--spacing-2xl);
  text-align: center;
  color: var(--color-text-light);
}

.page-title {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

.page-title::after {
  background: var(--color-accent);
}

.page-breadcrumb {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
}

.page-breadcrumb a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-fast);
}

.page-breadcrumb a:hover {
  color: var(--color-accent);
}

/* 分类筛选 */
.filter-tabs {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-xl);
}

.filter-tab {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-text-light);
  border: 2px solid var(--color-bg-light);
  border-radius: var(--radius-lg);
  font-weight: 500;
  color: var(--color-text);
  transition: all var(--transition-fast);
  cursor: pointer;
}

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

.filter-tab.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-light);
}

/* 详情页 */
.detail-hero {
  position: relative;
  height: 60vh;
  min-height: 400px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.detail-hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
}

.detail-hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    180deg,
    rgba(3, 4, 94, 0.3) 0%,
    rgba(3, 4, 94, 0.8) 100%
  );
}

.detail-hero-content {
  position: relative;
  z-index: 10;
  width: 100%;
  padding: var(--spacing-2xl);
  color: var(--color-text-light);
}

.detail-title {
  color: var(--color-text-light);
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--spacing-sm);
}

.detail-meta {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.detail-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}

.detail-content {
  padding: var(--spacing-2xl) 0;
}

.detail-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-xl);
}

.detail-main h3 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-bg-light);
}

.detail-main p {
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.detail-sidebar {
  position: sticky;
  top: 100px;
}

.info-card {
  background: var(--color-text-light);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-lg);
}

.info-card-title {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-bg-light);
}

.info-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.info-item {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-xs) 0;
  border-bottom: 1px dashed rgba(0, 119, 182, 0.2);
}

.info-label {
  color: var(--color-text-muted);
}

.info-value {
  font-weight: 500;
  color: var(--color-text);
}

/* 保护级别标签 */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
}

.status-critical {
  background: rgba(239, 68, 68, 0.1);
  color: #DC2626;
}

.status-endangered {
  background: rgba(245, 158, 11, 0.1);
  color: #D97706;
}

.status-vulnerable {
  background: rgba(245, 158, 11, 0.1);
  color: #D97706;
}

.status-near {
  background: rgba(16, 185, 129, 0.1);
  color: #059669;
}

/* === 响应式设计 === */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .detail-grid {
    grid-template-columns: 1fr;
  }
  
  .detail-sidebar {
    position: static;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(3, 4, 94, 0.98);
    flex-direction: column;
    padding: var(--spacing-md);
    gap: 0;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .nav-link {
    padding: var(--spacing-sm);
  }
  
  .dropdown {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    background: transparent;
    box-shadow: none;
    padding-left: var(--spacing-md);
    display: none;
  }
  
  .nav-item.open .dropdown {
    display: block;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-brand {
    max-width: 100%;
  }
  
  .footer-logo {
    justify-content: center;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .section {
    padding: var(--spacing-xl) 0;
  }
}

/* === 新闻动态样式 === */
.filter-bar {
  margin: var(--spacing-lg) 0;
}

.filter-tabs {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  padding: var(--spacing-md);
  background: rgba(135, 206, 235, 0.1);
  border-radius: var(--radius-lg);
}

.filter-tab {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-text-light);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.filter-tab.active {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: var(--color-text-light);
  border-color: var(--color-primary);
}

#news-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.news-item {
  background: var(--color-text-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.news-date {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-bg-dark), var(--color-primary));
  color: var(--color-text-light);
  font-size: 1.1rem;
  font-weight: 600;
}

.latest-badge {
  padding: 2px 8px;
  background: var(--color-coral);
  color: var(--color-text-light);
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.news-card {
  padding: var(--spacing-lg);
  border-bottom: 1px solid rgba(0, 119, 182, 0.1);
}

.news-card:last-child {
  border-bottom: none;
}

.news-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-bg-dark);
  margin-bottom: var(--spacing-sm);
}

.news-summary {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* === 科普文章样式（纯文字版） === */
.text-article-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.text-article-item {
  display: flex;
  gap: var(--spacing-lg);
  background: var(--color-text-light);
  padding: var(--spacing-lg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border-left: 4px solid transparent;
}

.text-article-item:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-lg);
  border-left-color: var(--color-primary);
}

.text-article-item.featured {
  background: linear-gradient(135deg, var(--color-text-light), rgba(0, 119, 182, 0.05));
  border-left-width: 6px;
}

.text-article-icon {
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}

.text-article-item.featured .text-article-icon {
  width: 70px;
  height: 70px;
  font-size: 2rem;
}

.text-article-content {
  flex: 1;
}

.text-article-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.text-article-category {
  padding: 4px 12px;
  color: var(--color-text-light);
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.text-article-date,
.text-article-time {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.text-article-level {
  padding: 2px 8px;
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
}

.text-article-level.easy {
  background: rgba(16, 185, 129, 0.1);
  color: #10B981;
}

.text-article-level.intermediate {
  background: rgba(245, 158, 11, 0.1);
  color: #D97706;
}

.text-article-level.hard {
  background: rgba(239, 68, 68, 0.1);
  color: #EF4444;
}

.text-article-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-bg-dark);
  margin-bottom: var(--spacing-sm);
}

.text-article-item.featured .text-article-title {
  font-size: 1.5rem;
}

.text-article-desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.text-article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.tag {
  padding: 4px 12px;
  background: linear-gradient(135deg, rgba(0, 119, 182, 0.1), rgba(0, 180, 216, 0.1));
  color: var(--color-primary);
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.tag:hover {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: var(--color-text-light);
}

.read-more-btn {
  align-self: flex-start;
  padding: 12px 24px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: var(--color-text-light);
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.read-more-btn:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.read-more-btn.small {
  padding: 8px 16px;
  font-size: 0.85rem;
}

@media (max-width: 768px) {
  .text-article-item {
    flex-direction: column;
  }
  
  .text-article-icon {
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
  }
  
  .text-article-item.featured .text-article-icon {
    width: 60px;
    height: 60px;
    font-size: 1.8rem;
  }
}

/* === 内容切换样式 === */
.content-toggle {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.toggle-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 14px 28px;
  background: var(--color-text-light);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-xl);
  color: var(--color-primary);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.toggle-btn:hover {
  background: rgba(0, 119, 182, 0.1);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.toggle-btn.active {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: var(--color-text-light);
  border-color: transparent;
}

.toggle-btn.active:hover {
  background: linear-gradient(135deg, var(--color-bg-dark), var(--color-primary));
}

.toggle-icon {
  font-size: 1.3rem;
}

.toggle-text {
  white-space: nowrap;
}

/* Tab内容切换 */
.tab-content {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
  .content-toggle {
    flex-direction: column;
    align-items: center;
  }

  .toggle-btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
}

/* === 海洋保护行动页面样式 === */
.action-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.action-card {
  background: var(--color-text-light);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.action-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.action-icon {
  width: 70px;
  height: 70px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.action-title {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-bg-dark);
  margin-bottom: var(--spacing-sm);
}

.action-desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.action-tips {
  background: linear-gradient(135deg, rgba(0, 119, 182, 0.05), rgba(0, 180, 216, 0.05));
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
}

.action-tips h4 {
  font-size: 0.9rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.action-tips ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.action-tips li {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
}

.action-tips li::before {
  content: "•";
  color: var(--color-secondary);
  position: absolute;
  left: 0;
}

/* 国际保护行动 */
.international-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.international-card {
  display: flex;
  gap: var(--spacing-lg);
  background: var(--color-text-light);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.international-card:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-lg);
}

.international-icon {
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  font-size: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.international-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-bg-dark);
  margin-bottom: var(--spacing-sm);
}

.international-content p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
}

.international-goals {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.goal-tag {
  padding: 4px 10px;
  background: linear-gradient(135deg, rgba(0, 119, 182, 0.1), rgba(0, 180, 216, 0.1));
  color: var(--color-primary);
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
}

/* 中国保护行动 */
.china-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
}

.china-card {
  background: var(--color-text-light);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.china-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.china-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.china-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-bg-dark);
  margin-bottom: var(--spacing-sm);
}

.china-card p {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  line-height: 1.5;
}

/* 加入我们 */
.join-content {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.join-text {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
}

.join-actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.join-actions .btn-secondary {
  background: transparent;
  color: var(--color-text-light);
  border: 2px solid rgba(255, 255, 255, 0.5);
}

.join-actions .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-text-light);
}

/* 响应式 */
@media (max-width: 1024px) {
  .action-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .china-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .action-grid {
    grid-template-columns: 1fr;
  }
  
  .international-grid {
    grid-template-columns: 1fr;
  }
  
  .china-grid {
    grid-template-columns: 1fr;
  }
  
  .international-card {
    flex-direction: column;
    text-align: center;
  }
  
  .international-icon {
    margin: 0 auto;
  }
}