/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', '微软雅黑', sans-serif;
}

body {
    background: linear-gradient(135deg, #f8f9ff 0%, #f1f4ff 100%);
}

.container1 {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--content-padding);
}

/* 标题区域 */
.header {
    text-align: center;
    margin-bottom: var(--section-spacing);
}

.header h1 {
    font-size: clamp(28px, 4vw, 36px);
    color: #2c3e50;
    margin-bottom: 20px;
}

.header p {
    font-size: clamp(16px, 2vw, 18px);
    color: #666;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

/* 卡片布局 */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--card-gap);
}

.card {
    background: white;
    border-radius: 15px;
    padding: clamp(20px, 4vw, 30px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

/* 卡片内容 */
.card h3 {
    font-size: clamp(18px, 2.5vw, 22px);
    color: #3498db;
    margin-bottom: 20px;
}

.card ul {
    list-style: none;
    padding: 0;
}

.card li {
    font-size: clamp(14px, 1.8vw, 16px);
    color: #666;
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
}

.card li::before {
    content: "•";
    color: #3498db;
    position: absolute;
    left: 0;
}

/* 科技装饰元素 */
.decor-line {
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, #3498db, #6c8cff);
    margin: 20px auto;
}

/* 响应式布局 */
@media (max-width: 768px) {
    .container1 {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 24px;
    }
    
    .header p {
        font-size: 16px;
        padding: 0 15px;
    }
    
    .grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .card {
        padding: 20px;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 25px;
    }
    
    .container1 {
        padding: 20px;
    }
}

@media (min-width: 1025px) {
    .grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 手机端 */
@media (max-width: 576px) {
  .box { width: 100%; }
}

/* 平板 */
@media (min-width: 577px) and (max-width: 992px) {
  .box { width: 50%; }
}

/* 桌面端 */
@media (min-width: 993px) {
  .box { width: 25%; }
}