:root {
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --text-color: #f8fafc;
    --card-bg: rgba(255, 255, 255, 0.1);
    --card-border: rgba(255, 255, 255, 0.1);
    --card-hover: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg-gradient);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-x: hidden;
}

/* Header */
.hub-header {
    width: 100%;
    padding: 40px 20px 20px;
    text-align: center;
    backdrop-filter: blur(10px);
}

.hub-title {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(to right, #4ade80, #3b82f6);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 0;
    letter-spacing: -1px;
}

.hub-subtitle {
    margin-top: 8px;
    color: #94a3b8;
    font-size: 0.95rem;
}

/* Grid */
.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 20px;
    padding: 20px;
    width: 100%;
    max-width: 600px;
}

/* App Card */
.app-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(8px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.app-card:hover {
    transform: translateY(-5px);
    background: var(--card-hover);
    box-shadow: 0 12px 20px rgba(0, 0, 0, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
}

.app-card:active {
    transform: scale(0.98);
}

.app-icon {
    font-size: 3rem;
    margin-bottom: 12px;
    filter: drop-shadow(0 4px 4px rgba(0, 0, 0, 0.2));
}

.app-name {
    color: #fff;
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
}

.app-desc {
    font-size: 0.75rem;
    color: #cbd5e1;
    text-align: center;
    margin-top: 4px;
    opacity: 0.8;
}

/* Specific Card Themes (Optional Glows) */
.card-vegbox::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at top right, rgba(74, 222, 128, 0.2), transparent 70%);
    pointer-events: none;
}

.card-hisab::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at top right, rgba(250, 204, 21, 0.15), transparent 70%);
    pointer-events: none;
}

.card-vendor::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at top right, rgba(59, 130, 246, 0.15), transparent 70%);
    pointer-events: none;
}

/* Footer / Version */
.hub-footer {
    margin-top: auto;
    padding: 40px;
    color: #475569;
    font-size: 0.8rem;
    text-align: center;
}

/* Mobile responsive tweak */
@media (max-width: 480px) {
    .app-grid {
        grid-template-columns: 1fr 1fr;
        /* 2 cols on mobile */
    }
}