/* CSS变量定义 - 浅色模式 */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-card: #ffffff;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --accent-primary: #6366f1;
  --accent-hover: #5558e3;
  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --card-hover-shadow: 0 20px 25px -5px rgba(99, 102, 241, 0.15), 0 10px 10px -5px rgba(99, 102, 241, 0.04);
}

/* CSS变量定义 - 深色模式 */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --accent-primary: #818cf8;
  --accent-hover: #6366f1;
  --border-color: #334155;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
  --card-hover-shadow: 0 20px 25px -5px rgba(129, 140, 248, 0.25), 0 10px 10px -5px rgba(129, 140, 248, 0.1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 头部样式 */
.header {
  padding: 2rem 0;
  border-bottom: 1px solid var(--border-color);
}

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

.site-info {
  text-align: center;
  flex: 1;
}

.site-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--accent-primary), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.site-domain {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* 主题切换按钮 */
.theme-toggle {
  background: none;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--text-primary);
}

.theme-toggle:hover {
  background-color: var(--bg-secondary);
  border-color: var(--accent-primary);
  transform: scale(1.05);
}

.sun-icon, .moon-icon {
  transition: opacity 0.3s ease, transform 0.3s ease;
}

[data-theme="dark"] .sun-icon {
  opacity: 0;
  transform: rotate(180deg);
}

[data-theme="dark"] .moon-icon {
  opacity: 1;
  transform: rotate(0deg);
}

.sun-icon {
  opacity: 1;
  transform: rotate(0deg);
}

.moon-icon {
  opacity: 0;
  transform: rotate(-180deg);
  position: absolute;
}

/* 主要内容区域 */
.main {
  flex: 1;
  padding: 3rem 0;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

/* 卡片样式 */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-primary), #a78bfa);
  transform: translateY(-100%);
  transition: transform 0.3s ease;
}

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

.card:hover::before {
  transform: translateY(0);
}

.card-coming-soon {
  cursor: default;
  opacity: 0.8;
}

.card-coming-soon:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-coming-soon::before {
  background: linear-gradient(90deg, var(--text-muted), #94a3b8);
}

.card-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--accent-primary), #a78bfa);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: white;
  transition: transform 0.3s ease;
}

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

.card-coming-soon .card-icon {
  background: linear-gradient(135deg, var(--text-muted), #94a3b8);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.card-subtitle {
  font-size: 1rem;
  color: var(--accent-primary);
  font-weight: 500;
  margin-bottom: 0.75rem;
}

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

/* 页脚样式 */
.footer {
  padding: 2rem 0;
  text-align: center;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  .site-title {
    font-size: 2rem;
  }
  
  .theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
  }
  
  .cards-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .card {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .site-title {
    font-size: 1.75rem;
  }
  
  .card {
    padding: 1.25rem;
  }
  
  .card-icon {
    width: 56px;
    height: 56px;
  }
}

/* 动画和过渡效果 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  animation: fadeIn 0.6s ease-out;
}

.card:nth-child(1) { animation-delay: 0.1s; }
.card:nth-child(2) { animation-delay: 0.2s; }
.card:nth-child(3) { animation-delay: 0.3s; }
.card:nth-child(4) { animation-delay: 0.4s; }

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--accent-primary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-hover);
}