/* --- Fallback Reset --- */
body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    background-color: #f1f5f9; /* Slate 100 */
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.glass-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

/* --- Premium 3D Glassmorphism Card --- */
.glass-card {
    background: rgba(255, 255, 255, 0.7); /* Semi-transparent white */
    backdrop-filter: blur(16px); /* High-quality frosting */
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.4); /* Crisp white edge */
    border-radius: 24px; /* Extra rounded for modern look */
    padding: 40px;
    box-shadow: 
        0 10px 25px -5px rgba(0, 0, 0, 0.1),
        0 8px 10px -6px rgba(0, 0, 0, 0.1),
        inset 0 0 20px rgba(255, 255, 255, 0.5); /* Internal 3D glow */
    text-align: center;
}

/* --- Typography --- */
h1 {
    font-size: 2rem;
    font-weight: 800;
    color: #1e293b;
    margin-bottom: 8px;
}

p.subtitle {
    color: #64748b;
    font-weight: 500;
    margin-bottom: 24px;
}

p.description {
    color: #475569;
    line-height: 1.6;
    margin-bottom: 32px;
}

/* --- The 3D Buttons --- */
#downloadBtn, #payButton {
    width: 100%;
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
    color: white;
    padding: 16px;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 14px 0 rgba(34, 197, 94, 0.39);
}

#downloadBtn:hover, #payButton:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(34, 197, 94, 0.5);
    filter: brightness(1.1);
}

#downloadBtn:active, #payButton:active {
    transform: translateY(-1px);
}

/* Disabled state for downloading */
#downloadBtn:disabled {
    background: #9ca3af;
    box-shadow: none;
    cursor: not-allowed;
    transform: none;
}

footer {
    margin-top: 30px;
    color: #94a3b8;
    font-size: 0.875rem;
    text-align: center;
}