:root {
    --bg-dark: #000000;
    --card-bg: rgba(30, 41, 59, 0.4);
    --accent-blue: #60a5fa;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.background-glow {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 80%;
    background: radial-gradient(circle, rgba(96, 165, 250, 0.08) 0%, transparent 70%);
    z-index: -1;
}

.hub-container {
    width: 100%;
    max-width: 900px;
    padding: 40px;
    text-align: center;
}

.hub-header {
    margin-bottom: 50px;
}

.hub-header h1 {
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 10px;
}

.hub-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.hub-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.hub-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    padding: 30px;
    border-radius: 24px;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    cursor: pointer;
}

.hub-card:not(.disabled):hover {
    transform: translateY(-8px);
    background: rgba(30, 41, 59, 0.6);
    border-color: var(--accent-blue);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.card-icon-box {
    width: 64px;
    height: 64px;
    background: rgba(96, 165, 250, 0.1);
    color: var(--accent-blue);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-icon-box svg {
    width: 32px;
    height: 32px;
}

.card-content h3 {
    font-size: 1.3rem;
    margin-bottom: 8px;
    font-weight: 600;
}

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

.card-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    background: #22c55e;
    color: white;
    padding: 4px 10px;
    border-radius: 20px;
}

.card-badge.locked {
    background: #475569;
}

.hub-card.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.hub-footer {
    margin-top: 60px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.1em;
}

@media (max-width: 600px) {
    .hub-container {
        padding: 20px;
    }

    .hub-header h1 {
        font-size: 1.8rem;
    }
}