:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --hover-glow: rgba(59, 130, 246, 0.5);
    --font-family: 'Lexend', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* Header */
header {
    padding: 60px 0 40px;
    text-align: center;
    background: radial-gradient(circle at top, #1e293b 0%, #0f172a 70%);
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -1px;
}

header p {
    color: var(--text-secondary);
    font-size: 1.2rem;
    font-weight: 300;
}

/* Main Grid */
main {
    flex: 1;
    padding: 40px 0;
    display: flex;
    align-items: center;
}

.logo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    justify-content: center;
}

.logo-card {
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: 30px;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.05);
    position: relative;
    overflow: hidden;
    height: 200px;
}

.logo-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.logo-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px -10px var(--hover-glow);
    border-color: rgba(59, 130, 246, 0.3);
}

.logo-card:hover::before {
    opacity: 1;
}

.logo-wrapper {
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin-bottom: 20px;
}

.logo-wrapper img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
    transition: transform 0.3s ease;
}

.logo-card:hover .logo-wrapper img {
    transform: scale(1.05);
}

.site-name {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 1.1rem;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.logo-card:hover .site-name {
    opacity: 1;
    color: var(--accent-color);
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid rgba(255,255,255,0.05);
    margin-top: auto;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .logo-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 20px;
    }

    .logo-card {
        height: 180px;
    }
}