/* 全局样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #6366f1;
  --secondary-color: #8b5cf6;
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-color: #f1f5f9;
  --text-secondary: #94a3b8;
  --border-color: #334155;
  --hover-color: #7c3aed;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, var(--bg-color) 0%, #1e293b 100%);
  color: var(--text-color);
  min-height: 100vh;
  line-height: 1.6;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

/* 头部样式 */
.header {
  text-align: center;
  margin-bottom: 3rem;
  animation: fadeInDown 0.6s ease-out;
}

.title {
  font-size: 3rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

/* 搜索框样式 */
.search-box {
  position: relative;
  max-width: 600px;
  margin: 0 auto;
}

.search-box input {
  width: 100%;
  padding: 1rem 3rem 1rem 1.5rem;
  font-size: 1rem;
  border: 2px solid var(--border-color);
  border-radius: 50px;
  background: var(--card-bg);
  color: var(--text-color);
  outline: none;
  transition: all 0.3s ease;
}

.search-box input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-icon {
  position: absolute;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  pointer-events: none;
}

/* 分类标签样式 */
.categories {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
  animation: fadeInUp 0.6s ease-out 0.2s both;
}

.category-btn {
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  border: 2px solid var(--border-color);
  border-radius: 50px;
  background: var(--card-bg);
  color: var(--text-color);
  cursor: pointer;
  transition: all 0.3s ease;
}

.category-btn:hover {
  border-color: var(--primary-color);
  transform: translateY(-2px);
}

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

/* 书签网格 */
.bookmarks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  animation: fadeInUp 0.6s ease-out 0.4s both;
}

/* 书签卡片 */
.bookmark-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.bookmark-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.bookmark-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.bookmark-card:hover::before {
  transform: scaleX(1);
}

.bookmark-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: block;
}

.bookmark-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-color);
}

.bookmark-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.bookmark-url {
  font-size: 0.85rem;
  color: var(--primary-color);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.bookmark-url:hover {
  color: var(--hover-color);
  text-decoration: underline;
}

.bookmark-category {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  background: rgba(99, 102, 241, 0.2);
  color: var(--primary-color);
  border-radius: 50px;
  margin-top: 0.5rem;
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-secondary);
  font-size: 1.2rem;
}

/* 页脚 */
.footer {
  text-align: center;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* 动画 */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }

  .title {
    font-size: 2rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .bookmarks-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
  }

  .categories {
    gap: 0.5rem;
  }

  .category-btn {
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
  }
}

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

  .title {
    font-size: 1.75rem;
  }
}