:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --card-hover: #334155;
    --border: #334155;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.header {
    text-align: center;
    margin-bottom: 4rem;
    padding-top: 3rem;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.card:hover {
    background: var(--card-hover);
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.card-desc {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.card-btn {
    color: var(--accent);
    font-weight: 500;
    font-size: 0.875rem;
    transition: color 0.2s;
}

.card:hover .card-btn {
    color: var(--accent-hover);
}

.footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-secondary);
    font-size: 0.75rem;
    border-top: 1px solid var(--border);
}

/* Mobile First Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .header {
        margin-bottom: 2rem;
        padding-top: 2rem;
    }
    
    .title {
        font-size: 1.75rem;
    }
    
    .subtitle {
        font-size: 0.875rem;
    }
    
    .grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin-bottom: 2rem;
    }
    
    .card {
        padding: 1.5rem;
    }
    
    .card-icon {
        font-size: 2.5rem;
    }
    
    .card-title {
        font-size: 1.125rem;
    }
    
    .card-desc {
        font-size: 0.8125rem;
    }
}

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

@media (min-width: 1025px) {
    .grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Touch-friendly for mobile devices */
@media (hover: none) and (pointer: coarse) {
    .card {
        min-height: 180px;
    }
    
    .card:active {
        transform: scale(0.98);
    }
}