.test-cards-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.page-header {
    margin-bottom: 40px;
    text-align: center;
    position: relative;
}

.back-button {
    position: absolute;
    left: 0;
    top: 0;
    padding: 10px 20px;
    background: var(--bg-secondary);
    color: var(--primary-light);
    text-decoration: none;
    border: 1px solid var(--primary);
    border-radius: 0;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.2s;
}

.back-button:hover {
    background: var(--primary);
    color: white;
    transform: translateX(-3px);
}

.page-header h1 {
    font-size: 32px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.page-header p {
    font-size: 14px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.page-header a {
    color: var(--primary);
    text-decoration: none;
    border-bottom: 1px solid var(--primary);
}

.page-header a:hover {
    color: var(--primary-light);
    border-bottom-color: var(--primary-light);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.card-category {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 20px;
}

.card-category h2 {
    font-size: 18px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin: 0 0 20px 0;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary);
    color: var(--text-primary);
}

.card-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 15px;
    margin-bottom: 15px;
    transition: all 0.2s;
}

.card-item:hover {
    border-color: var(--primary);
    transform: translateX(5px);
}

.card-item:last-child {
    margin-bottom: 0;
}

.card-brand {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--primary);
    margin-bottom: 8px;
}

.card-number {
    font-family: 'Courier New', monospace;
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: 2px;
}

.card-details {
    display: flex;
    gap: 20px;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.card-result {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 4px 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    display: inline-block;
}

.card-result.success {
    border-color: var(--success);
    color: var(--success);
}

.card-result.declined {
    border-color: var(--error);
    color: var(--error);
}

.card-result.error {
    border-color: #f59e0b;
    color: #f59e0b;
}

.info-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 20px;
    margin-bottom: 20px;
}

.info-section h2 {
    font-size: 16px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin: 0 0 15px 0;
    color: var(--primary);
}

.info-section ul {
    margin: 0;
    padding-left: 20px;
}

.info-section li {
    font-size: 14px;
    color: var(--text-lighter);
    margin-bottom: 8px;
    line-height: 1.6;
}

.info-section code {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 2px 6px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    color: var(--primary);
}

.copy-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 4px 8px;
    font-size: 11px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.2s;
    margin-left: 10px;
}

.copy-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.copy-btn.copied {
    border-color: var(--success);
    color: var(--success);
}

.nav-buttons {
    text-align: center;
    margin-top: 40px;
}