:root {
    --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    --card-bg: rgba(255, 255, 255, 0.75);
    --card-border: rgba(99, 102, 241, 0.08);
    --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    --primary-glow: rgba(79, 70, 229, 0.15);
    --accent-green: #059669;
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --card-shadow: 0 10px 30px -10px rgba(31, 41, 55, 0.08), 0 1px 3px rgba(0, 0, 0, 0.03);
    --card-shadow-hover: 0 15px 35px -5px rgba(31, 41, 55, 0.12), 0 3px 10px rgba(0, 0, 0, 0.04);
    
    --header-bg: rgba(255, 255, 255, 0.45);
    --logo-gradient: linear-gradient(135deg, #0f172a 0%, #334155 100%);
    --logo-icon-color: #4f46e5;
}

/* Decorative background glow */
body::before {
    content: '';
    position: fixed;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(79, 70, 229, 0.05) 0%, rgba(124, 58, 237, 0.01) 50%, transparent 100%);
    top: -200px;
    left: -100px;
    z-index: 0;
    pointer-events: none;
}

main {
    flex: 1;
    z-index: 5;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
    padding: 4rem 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    gap: 3rem;
    box-sizing: border-box;
}

.intro_container {
    animation: fadeIn 0.8s ease-out;
    max-width: 650px;
}

.intro_title {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 1rem;
    line-height: 1.15;
    background: linear-gradient(to bottom, #0f172a 30%, #334155 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.intro_desc {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.6;
}

.grid_container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    width: 100%;
    max-width: 500px;
    animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 16px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    box-shadow: var(--card-shadow);
    text-decoration: none;
    color: inherit;
    transition: var(--transition-smooth);
}

.card:hover {
    border-color: rgba(99, 102, 241, 0.15);
    box-shadow: var(--card-shadow-hover);
    transform: translateY(-5px);
}

.card_icon_wrapper {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: rgba(79, 70, 229, 0.08);
    border: 1px solid rgba(79, 70, 229, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #7c3aed;
    transition: var(--transition-smooth);
}

.card:hover .card_icon_wrapper {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 0 20px var(--primary-glow);
    border-color: transparent;
}

.card_title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
}

.card_desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.card_action_btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: #4f46e5;
    transition: var(--transition-smooth);
}

.card:hover .card_action_btn {
    color: #7c3aed;
    transform: translateX(4px);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}