:root {
    --bg-primary: rgba(12, 12, 12, 0.75);
    --bg-secondary: #0f0f0f;
    --bg-card: rgba(20, 20, 20, 0.85);
    --glass: rgba(255, 255, 255, 0.03);
    --primary: #ffffff;
    --secondary: #b0b0b0;
    --muted: #777;
    --black: #141414;
    --gradient-bg: linear-gradient(135deg, #0a0a0a 0%, #111 50%, #0c0c0c 100%);
    --invite: #0055c8;
    --invite-hover: #003f96;
    --radius: 14px;
    --transition: .25s ease;
}

body {
    margin: 0;
    font-family: "Poppins", sans-serif;
    background: var(--gradient-bg);
    color: var(--primary);
}

.bg-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(circle at top left, rgba(0,85,200,0.3), transparent 65%),
    radial-gradient(circle at bottom right, rgba(0,85,200,0.25), transparent 60%);
    opacity: .8;
}

.header {
    display: flex;
    justify-content: center;
    padding: 20px;
    background: rgba(10,10,10,0.55);
    backdrop-filter: blur(10px);
}

.logo a {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.logo a:hover {
    color: #70aaff;
}

.content {
    max-width: 1100px;
    margin: 40px auto;
    text-align: center;
}

.intro p {
    color: var(--secondary);
}

.card-grid {
    margin-top: 40px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 35px;
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    backdrop-filter: blur(8px);
    box-shadow: 0 0 25px rgba(0,0,0,0.4);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 0 30px rgba(0,85,200,0.45);
}

.card-img {
    width: 100%;
    height: 160px;
    object-fit: cover;
}

.card-body {
    padding: 20px;
    text-align: left;
}

.card-body p {
    color: var(--secondary);
    margin-bottom: 18px;
}

.btn {
    width: 100%;
    padding: 14px;
    border-radius: var(--radius);
    border: none;
    background: var(--invite);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn:hover {
    background: var(--invite-hover);
}

@media (max-width: 900px) {
    .card-grid {
        grid-template-columns: 1fr;
    }
}