:root {
    --bg-color: #1a1a1a;
    --text-color: #f0f0f0;
    --primary-color: #6200ea;
    --primary-dark: #3700b3;
    --card-bg: #2a2a2a;
    --border-color: #444;
    --button-hover-bg: #4c00a3;
    --button-secondary-bg: #444;
    --button-secondary-hover-bg: #555;
    --error-color: #ff5252;
    --success-color: #4CAF50;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    box-sizing: border-box;
}

header {
    background-color: var(--card-bg);
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

header h1 {
    margin: 0;
    color: var(--primary-color);
}

header p {
    color: #bbb;
}

main {
    flex-grow: 1;
    padding: 20px;
    max-width: 900px;
    margin: 20px auto;
}

section {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

h2 {
    color: var(--primary-color);
    margin-top: 0;
    border-bottom: 2px solid var(--primary-dark);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.card {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    transition: transform 0.2s ease-in-out;
}

.card:hover {
    transform: translateY(-5px);
}

.card h3 {
    margin-top: 0;
    color: var(--text-color);
}

.card p {
    font-size: 0.9em;
    color: #ccc;
    margin-bottom: 15px;
}

button {
    background-color: var(--primary-color);
    color: var(--text-color);
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.3s ease;
    margin-top: 10px;
}

button:hover {
    background-color: var(--button-hover-bg);
}

.btn-secondary {
    background-color: var(--button-secondary-bg);
}

.btn-secondary:hover {
    background-color: var(--button-secondary-hover-bg);
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #ccc;
}

.form-group input[type="text"] {
    width: calc(100% - 20px);
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: #333;
    color: var(--text-color);
    font-size: 1em;
}

.form-group input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(98, 0, 234, 0.5);
}

.payment-card img {
    max-width: 250px;
    height: auto;
    display: block;
    margin: 20px auto;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.payment-card .note {
    font-size: 0.85em;
    color: #aaa;
    margin-top: 15px;
}

.hidden {
    display: none;
}

footer {
    text-align: center;
    padding: 20px;
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    color: #bbb;
    margin-top: auto;
    font-size: 0.9em;
    line-height: 1.6;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

footer a:hover {
    color: var(--button-hover-bg);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    /* ... (existing responsive CSS) ... */
}

@media (max-width: 480px) {
    /* ... (existing responsive CSS) ... */
    footer {
        padding: 15px;
        font-size: 0.8em;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    main {
        padding: 15px;
        margin: 15px auto;
    }

    section {
        padding: 20px;
    }

    .card-container {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 15px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.8em;
    }

    h2 {
        font-size: 1.5em;
    }

    button {
        padding: 8px 15px;
        font-size: 0.9em;
    }

    .card {
        padding: 15px;
    }
    .form-group input[type="text"] {
        width: calc(100% - 16px); /* Adjust padding for smaller screens */
    }
}