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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
    min-width: 320px;
}

header {
    background: linear-gradient(135deg, #1a73e8, #6c5ce7);
    color: white;
    padding: 2rem 1rem;
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.country-section {
    margin-bottom: 3rem;
}

.country-section h2 {
    color: #2d3436;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #1a73e8;
}

.model-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.model-card {
    background: white;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, box-shadow 0.2s;
    text-decoration: none;
    color: inherit;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.model-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.model-card h3 {
    color: #1a73e8;
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.model-card .company {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.model-card .description {
    font-size: 0.95rem;
    color: #4a4a4a;
    flex-grow: 1;
}

footer {
    text-align: center;
    padding: 2rem 1rem;
    background-color: #fff;
    margin-top: 3rem;
    color: #666;
    font-size: 0.9rem;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

/* 移动端适配 */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }
    
    header p {
        font-size: 1rem;
        padding: 0 1rem;
    }

    .model-cards {
        grid-template-columns: 1fr;
    }

    .model-card {
        margin: 0 auto;
        width: 100%;
        max-width: 400px;
    }

    .model-card h3 {
        font-size: 1.2rem;
    }

    .country-section h2 {
        font-size: 1.5rem;
        text-align: center;
    }

    footer {
        padding: 1.5rem 1rem;
    }
}

/* 小屏幕手机适配 */
@media (max-width: 375px) {
    header h1 {
        font-size: 1.5rem;
    }

    .model-card {
        padding: 1.25rem;
    }

    .model-card h3 {
        font-size: 1.1rem;
    }

    .model-card .description {
        font-size: 0.9rem;
    }
}