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

:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --background: #0f172a;
    --surface: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #334155;
    --hover-color: #475569;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --card-hover-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    background: linear-gradient(135deg, var(--background) 0%, #1a1f35 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.main-content {
    flex: 1;
}

.sites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.site-card {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--card-shadow);
}

.site-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--card-hover-shadow);
    background: var(--hover-color);
}

.site-icon {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    object-fit: cover;
    background: var(--background);
    padding: 8px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease;
}

.site-card:hover .site-icon {
    transform: scale(1.1);
}

.site-icon-placeholder {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}

.site-name {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    word-break: break-word;
}

.footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: auto;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .sites-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1rem;
    }

    .site-card {
        padding: 1.25rem;
    }

    .site-icon,
    .site-icon-placeholder {
        width: 56px;
        height: 56px;
    }

    .site-name {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .sites-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .title {
        font-size: 1.75rem;
    }
}

/* 加载动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.site-card {
    animation: fadeIn 0.5s ease forwards;
}

.site-card:nth-child(1) { animation-delay: 0.1s; }
.site-card:nth-child(2) { animation-delay: 0.2s; }
.site-card:nth-child(3) { animation-delay: 0.3s; }
.site-card:nth-child(4) { animation-delay: 0.4s; }
.site-card:nth-child(5) { animation-delay: 0.5s; }
.site-card:nth-child(6) { animation-delay: 0.6s; }