:root {
    --space-dark: #020205;
    --moon-light: #e0e0e0;
    --glow-blue: #00d2ff;
    --glow-purple: #9d50bb;
    --accent: #ff4d4d;
    --panel-bg: rgba(20, 20, 30, 0.85);
    --border-color: rgba(0, 210, 255, 0.3);
}

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

body {
    background: var(--space-dark);
    color: var(--moon-light);
    font-family: 'Roboto', sans-serif;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Background Stars and Twinkling */
.stars, .twinkling {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.stars {
    background: #000 url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/123163/stars.png') repeat top center;
}

.twinkling {
    background: transparent url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/123163/twinkling.png') repeat top center;
    animation: move-twink-back 200s linear infinite;
}

@keyframes move-twink-back {
    from { background-position: 0 0; }
    to { background-position: -10000px 5000px; }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
    flex: 1;
}

header {
    text-align: center;
    margin-bottom: 5rem;
    animation: fadeInDown 1.5s ease-out;
}

header h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 4rem;
    letter-spacing: 0.8rem;
    background: linear-gradient(to right, #00d2ff, #9d50bb);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 25px rgba(0, 210, 255, 0.4);
}

header .subtitle {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.2rem;
    color: var(--glow-blue);
    margin-top: 1rem;
    letter-spacing: 0.3rem;
    text-transform: uppercase;
}

.selection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 3rem;
    animation: fadeInUp 1s ease-out;
}

.selection-card {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 3rem 2rem;
    text-align: center;
    text-decoration: none;
    color: var(--moon-light);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.selection-card:hover {
    transform: translateY(-15px) scale(1.02);
    border-color: var(--glow-blue);
    box-shadow: 0 0 50px rgba(0, 210, 255, 0.3);
}

.card-icon {
    font-size: 4rem;
    margin-bottom: 0.5rem;
    filter: drop-shadow(0 0 10px rgba(0, 210, 255, 0.5));
}

.selection-card h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.8rem;
    color: var(--glow-blue);
    letter-spacing: 0.1rem;
}

.selection-card p {
    font-size: 1rem;
    line-height: 1.6;
    color: rgba(224, 224, 224, 0.8);
    margin-bottom: 1rem;
}

.btn-launch {
    padding: 0.8rem 2.5rem;
    background: linear-gradient(45deg, var(--glow-blue), var(--glow-purple));
    border-radius: 30px;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 2px;
    transition: 0.3s;
    margin-top: auto;
}

.selection-card:hover .btn-launch {
    box-shadow: 0 0 20px var(--glow-blue);
    transform: scale(1.05);
}

.footer {
    text-align: center;
    padding: 2rem;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    color: rgba(224, 224, 224, 0.5);
    letter-spacing: 2px;
}

.footer a {
    color: var(--glow-blue);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-40px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2.5rem;
        letter-spacing: 0.3rem;
    }
    .selection-grid {
        grid-template-columns: 1fr;
    }
}