* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
}

body {
    background: #f5f7fa;
}

.container {
    width: 100%;
    min-height: 500px;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--content-padding);
}

h1.container-title {
    text-align: center;
    color: #2c3e50;
    padding-top: clamp(50px, 8vh, 100px);
    margin-bottom: clamp(30px, 5vh, 50px);
    font-size: clamp(24px, 4vw, 36px);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: clamp(20px, 3vw, 30px);
    padding: 20px 0;
}

.card {
    background: white;
    border-radius: 15px;
    padding: clamp(20px, 3vw, 30px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    transition: transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

.card-icon {
    font-size: clamp(2em, 5vw, 2.5em);
    color: #3498db;
    margin-bottom: clamp(15px, 2vw, 20px);
}

.card-title {
    color: #2c3e50;
    font-size: clamp(18px, 2.5vw, 24px);
    margin-bottom: clamp(10px, 1.5vw, 15px);
    font-weight: 600;
}

.card-content {
    color: #7f8c8d;
    line-height: 1.6;
    font-size: clamp(14px, 1.8vw, 16px);
}

.highlight {
    color: #e74c3c;
    font-weight: bold;
}

/* 响应式布局 */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }
    
    .grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .card {
        padding: 25px;
    }
}

/* 平板 */
@media (min-width: 769px) and (max-width: 1024px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 大屏幕 */
@media (min-width: 1025px) {
    .grid {
        grid-template-columns: repeat(4, 1fr);
    }
}