:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #059669;
    --error-color: #dc2626;
    --warning-color: #d97706;
    --background: #f8fafc;
    --card-background: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --border-radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

/* NBS Consulting Header */
.nbs-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nbs-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nbs-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nbs-icon {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: white;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: -0.5px;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.nbs-text {
    display: flex;
    flex-direction: column;
}

.company-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.tagline {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.nbs-secure {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--success-color);
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0.5rem 1rem;
    background: rgba(5, 150, 105, 0.1);
    border-radius: 6px;
    border: 1px solid rgba(5, 150, 105, 0.2);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.card:hover {
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

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

.progress-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    position: relative;
}

.progress-bar::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--border-color);
    z-index: 1;
}

.progress-step {
    background: var(--card-background);
    border: 3px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    position: relative;
    z-index: 2;
    transition: var(--transition);
}

.progress-step.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.progress-step.completed {
    background: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

.form-section {
    margin-bottom: 2rem;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-icon {
    width: 20px;
    height: 20px;
    color: var(--primary-color);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.form-grid.two-columns {
    grid-template-columns: 1fr 1fr;
}

.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    background: var(--card-background);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input:read-only {
    background: #f1f5f9;
    color: var(--text-secondary);
    cursor: not-allowed;
}

.form-input.error {
    border-color: var(--error-color);
}

.error-message {
    color: var(--error-color);
    font-size: 0.75rem;
    margin-top: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    max-height: 2rem;
    overflow: hidden;
    line-height: 1.2;
}

.success-message {
    color: var(--success-color);
    font-size: 0.75rem;
    margin-top: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    max-height: 2rem;
    overflow: hidden;
    line-height: 1.2;
}

.summary-card {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.summary-row:last-child {
    margin-bottom: 0;
    padding-top: 0.75rem;
    border-top: 2px solid var(--border-color);
    font-weight: 600;
    font-size: 1.1rem;
}

.summary-label {
    color: var(--text-secondary);
}

.summary-value {
    color: var(--text-primary);
    font-weight: 500;
}

.total-amount {
    color: var(--primary-color);
    font-size: 1.25rem;
    font-weight: 700;
}

.button {
    padding: 0.875rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 48px;
}

.button-primary {
    background: var(--primary-color);
    color: white;
}

.button-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.button-secondary {
    background: var(--card-background);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.button-secondary:hover:not(:disabled) {
    border-color: var(--text-secondary);
    background: #f8fafc;
}

.button-success {
    background: var(--success-color);
    color: white;
}

.button-success:hover:not(:disabled) {
    background: #047857;
    transform: translateY(-1px);
}

.button-danger {
    background: var(--error-color);
    color: white;
}

.button-danger:hover:not(:disabled) {
    background: #b91c1c;
}

.button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.button-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.loading-spinner {
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top: 3px solid white;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.alert-success {
    background: #d1fae5;
    border: 1px solid #a7f3d0;
    color: #065f46;
}

.alert-error {
    background: #fee2e2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

.alert-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-top: 2px;
}

.result-card {
    text-align: center;
    padding: 3rem 2rem;
}

.result-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
}

.result-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

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

.result-title.error {
    color: var(--error-color);
}

.transaction-id {
    background: #f1f5f9;
    padding: 1rem;
    border-radius: 8px;
    margin: 1.5rem 0;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.security-badges {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.security-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.security-icon {
    width: 16px;
    height: 16px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .card {
        padding: 1.5rem;
        margin-bottom: 1rem;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .form-grid.two-columns {
        grid-template-columns: 1fr;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .button {
        width: 100%;
    }
    
    .security-badges {
        flex-wrap: wrap;
    }
    
    .result-card {
        padding: 2rem 1rem;
    }
    
    .result-icon {
        width: 60px;
        height: 60px;
    }
    
    .result-title {
        font-size: 1.5rem;
    }
    
    /* NBS Header Responsive */
    .nbs-container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .nbs-logo {
        justify-content: center;
    }
    
    .company-name {
        font-size: 1.1rem;
    }
    
    .nbs-icon {
        width: 40px;
        height: 40px;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .progress-bar {
        font-size: 0.8rem;
    }
    
    .progress-step {
        width: 32px;
        height: 32px;
        font-size: 0.8rem;
    }
    
    .header h1 {
        font-size: 1.75rem;
    }
}

/* Card Type Icons */
.card-type-icons {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.card-type-icon {
    width: 32px;
    height: 20px;
    background-size: contain;
    background-repeat: no-repeat;
    opacity: 0.5;
    transition: var(--transition);
}

.card-type-icon.active {
    opacity: 1;
    transform: scale(1.1);
}

/* Loading States */
.processing-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    color: white;
}

.processing-spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top: 4px solid white;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

.processing-text {
    font-size: 1.1rem;
    text-align: center;
}

/* Animations */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    animation: slideInUp 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.alert {
    animation: fadeIn 0.3s ease-out;
}