/* 基础样式重置与自定义属性 */
:root {
  --primary-color: #2563eb;
  --secondary-color: #7c3aed;
  --accent-color: #f59e0b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --bg-gradient: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  --card-bg: rgba(255, 255, 255, 0.05);
  --card-hover: rgba(255, 255, 255, 0.1);
  --card-border: rgba(255, 255, 255, 0.1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* 基础排版设置 */
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg-gradient);
  color: var(--text-primary);
  line-height: 1.6;
  padding: 2rem;
  min-height: 100vh;
}

/* 标题样式优化 */
h1, h2, h3, h4 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-align: center;
  margin: 2rem 0 3rem;
}

/* 通知条改进 */
.notification {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--text-primary);
  padding: 1rem;
  border-radius: 1rem;
  margin-bottom: 2rem;
  font-size: 1.1rem;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid var(--card-border);
}

/* 卡片容器与布局 */
.cards-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin: 3rem auto;
  max-width: 1600px;
}

/* 卡片样式现代化 */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--card-border);
  border-radius: 1.5rem;
  padding: 2rem;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transform: scaleX(0);
  transition: transform 0.4s ease;
}

.card:hover {
  transform: translateY(-8px);
  background: var(--card-hover);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

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

/* 卡片内容样式优化 */
.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 1.5rem 0 1rem;
  background: linear-gradient(to right, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.card-description {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

/* 按钮样式现代化 */
.card-button {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 2rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.card-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card-button:hover::before {
  opacity: 1;
}

.card-button span {
  position: relative;
  z-index: 1;
}

/* 文章样式优化 */
.example-article {
  background: var(--card-bg);
  border-radius: 1.5rem;
  padding: 2.5rem;
  margin: 3rem auto;
  max-width: 900px;
  backdrop-filter: blur(10px);
  border: 1px solid var(--card-border);
}

/* 改进的淡入动画 */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

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

/* 响应式优化 */
@media (max-width: 768px) {
  body {
    padding: 1rem;
  }
  
  .cards-container {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .card {
    padding: 1.5rem;
  }
  
  .example-article {
    padding: 1.5rem;
    margin: 2rem auto;
  }
}

/* 深色模式优化 */
@media (prefers-color-scheme: dark) {
  :root {
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-hover: rgba(255, 255, 255, 0.06);
  }
}