/* CSS Variables */
:root {
    --primary-color: #1da1f2;
    --primary-hover: #0d8bd9;
    --secondary-color: #657786;
    --success-color: #17bf63;
    --danger-color: #e0245e;
    --warning-color: #ffad1f;
    --background-color: #15202b;
    --card-background: #192734;
    --border-color: #38444d;
    --text-primary: #ffffff;
    --text-secondary: #8899a6;
    --text-muted: #657786;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
    --border-radius: 16px;
    --transition: all 0.2s ease-in-out;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
.header {
    background-color: var(--card-background);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    /* Removed sticky positioning so header scrolls with content */
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 20px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--primary-color);
}

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

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem 0;
}

.section {
    margin-bottom: 2rem;
}

/* Card Styles */
.card {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(29, 161, 242, 0.1);
}

.card-header h2 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    font-size: 1.25rem;
}

.card-body {
    padding: 1.5rem;
}

/* Form Styles */
.form-group {
    margin-bottom: 1rem;
}

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

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--background-color);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(29, 161, 242, 0.2);
}

select.form-control {
    cursor: pointer;
}

textarea.form-control {
    resize: vertical;
    min-height: 80px;
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    background: none;
    color: inherit;
}

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

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: #5a6c7a;
}

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

.btn-success:hover:not(:disabled) {
    background-color: #0fa54f;
}

.btn-outline {
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover:not(:disabled) {
    background-color: var(--border-color);
}

/* Camera Styles */
.camera-container {
    position: relative;
    margin: 1rem 0;
    border-radius: 8px;
    overflow: hidden;
    max-width: 100%;
}

.camera-stream {
    width: 100%;
    max-width: 400px;
    height: auto;
    display: block;
}

.qr-canvas {
    display: none;
}

/* Payment Controls */
.payment-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

/* Payment Details */
.payment-details {
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    margin: 1rem 0;
}

.payment-info {
    margin-bottom: 1rem;
}

.info-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.info-item:last-child {
    border-bottom: none;
}

.info-item label {
    font-weight: 500;
    color: var(--text-secondary);
}

.info-item span {
    color: var(--text-primary);
    font-weight: 500;
}

/* Status Styles */
.status-content {
    min-height: 50px;
}

.status-message {
    padding: 0.75rem;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-info {
    background-color: rgba(29, 161, 242, 0.1);
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

.status-success {
    background-color: rgba(23, 191, 99, 0.1);
    border: 1px solid var(--success-color);
    color: var(--success-color);
}

.status-error {
    background-color: rgba(224, 36, 94, 0.1);
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
}

.status-warning {
    background-color: rgba(255, 173, 31, 0.1);
    border: 1px solid var(--warning-color);
    color: var(--warning-color);
}

/* Text Utilities */
.text-muted {
    color: var(--text-muted);
}

.text-center {
    text-align: center;
}

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

.loading-spinner {
    text-align: center;
    color: var(--text-primary);
}

.loading-spinner i {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* Footer */
.footer {
    background-color: var(--card-background);
    border-top: 1px solid var(--border-color);
    padding: 1rem 0;
    text-align: center;
    color: var(--text-muted);
    margin-top: auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .user-info {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .payment-controls {
        flex-direction: column;
    }
    
    .payment-controls .btn {
        width: 100%;
        justify-content: center;
    }
    
    .info-item {
        flex-direction: column;
        text-align: left;
    }
    
    .info-item label {
        margin-bottom: 0.25rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .btn {
        padding: 0.875rem 1.25rem;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.25rem;
    }
    
    .card-header h2 {
        font-size: 1.1rem;
    }
    
    .form-control {
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

/* Animation for smooth transitions */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for accessibility */
.btn:focus,
.form-control:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}