* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

body {
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: linear-gradient(135deg, #1a73e8, #0d47a1);
    color: white;
    padding: 40px 20px;
    text-align: center;
    border-radius: 0 0 15px 15px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    margin-bottom: 40px;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 700px;
    margin: 0 auto;
}

.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 350px));
    gap: 30px;
    margin-bottom: 50px;
}

.card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 20px rgba(0, 0, 0, 0.12);
}

.card-header {
    padding: 20px;
    color: white;
    font-weight: 600;
    font-size: 1.3rem;
}

.business {
    background: linear-gradient(135deg, #4285f4, #1a73e8);
}

.gpu {
    background: linear-gradient(135deg, #34a853, #0f9d58);
}

.network {
    background: linear-gradient(135deg, #ea4335, #d93025);
}

.card-body {
    padding: 25px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 20px;
}

.contact-icon {
    background: #f1f3f4;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    color: #1a73e8;
    flex-shrink: 0;
}

.contact-info h3 {
    font-size: 1.1rem;
    margin-bottom: 5px;
    color: #1a73e8;
}

.contact-info p {
    color: #5f6368;
}

.address {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin-top: 15px;
    border-left: 4px solid #1a73e8;
}

.address h4 {
    margin-bottom: 8px;
    color: #333;
}

.footer {
    text-align: center;
    padding: 30px 0;
    color: #5f6368;
    border-top: 1px solid #e0e0e0;
    margin-top: 30px;
}

@media (max-width: 768px) {
    .cards-container {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: 2rem;
    }
}