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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #f5f5f5;
    min-height: 100vh;
    color: #333;
}

/* Screen Management */
.screen {
    display: none;
    min-height: 100vh;
    flex-direction: column;
}

.screen.active {
    display: flex;
}

/* Header Bar */
.header-bar {
    background: #1a237e;
    color: white;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.header-content {
    flex: 1;
}

.header-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 4px;
}

.header-subtitle {
    font-size: 12px;
    opacity: 0.9;
    font-weight: 400;
}

.change-btn {
    background: transparent;
    border: none;
    color: white;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 6px;
    transition: background 0.2s;
}

.change-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Container */
.container {
    flex: 1;
    padding: 20px;
    max-width: 500px;
    margin: 0 auto;
    width: 100%;
}

/* Order Details Card */
.order-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    position: relative;
    border-left: 4px solid #ffc107;
}

.order-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid #f0f0f0;
}

.order-title {
    font-size: 16px;
    font-weight: 700;
    color: #333;
}

.order-id {
    font-size: 14px;
    color: #666;
    font-weight: 500;
}

.order-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.order-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    color: #666;
}

.order-row.grand-total {
    margin-top: 8px;
    padding-top: 12px;
    border-top: 1px solid #f0f0f0;
    font-weight: 700;
    font-size: 16px;
    color: #333;
}

.order-value {
    font-weight: 600;
    color: #333;
}

/* Payment Options Card */
.payment-options-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.payment-options-title {
    font-size: 16px;
    font-weight: 700;
    color: #333;
    margin-bottom: 16px;
}

.payment-option {
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.payment-option.active {
    border-color: #7b2cbf;
    background: #f3e8ff;
}

.upi-logo {
    font-size: 24px;
}

.upi-text {
    font-size: 16px;
    font-weight: 600;
    color: #333;
}

.payment-option.active .upi-text {
    color: #7b2cbf;
}

/* QR Code Card */
.qr-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    text-align: center;
}

.qr-title {
    font-size: 18px;
    font-weight: 700;
    color: #333;
    margin-bottom: 8px;
}

.qr-instruction {
    font-size: 14px;
    color: #666;
    margin-bottom: 16px;
}

.upi-apps {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 20px;
}

.upi-app-icon {
    background: #f5f5f5;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 600;
    color: #666;
}

.qr-code-container {
    display: flex;
    justify-content: center;
    margin: 20px 0;
    padding: 20px;
    background: white;
    border-radius: 12px;
}

#qrcode {
    display: inline-block;
}

#qrcode canvas {
    max-width: 100%;
    height: auto;
}

.upi-id-section {
    margin: 20px 0;
}

.upi-id-label {
    font-size: 12px;
    color: #666;
    margin-bottom: 8px;
    font-weight: 600;
}

.upi-id-value {
    background: #f5f5f5;
    border-radius: 8px;
    padding: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: background 0.2s;
    font-size: 14px;
    font-weight: 500;
    color: #333;
}

.upi-id-value:hover {
    background: #e8e8e8;
}

.copy-icon {
    font-size: 18px;
}

.paid-btn {
    width: 100%;
    background: #4caf50;
    color: white;
    border: none;
    border-radius: 12px;
    padding: 16px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
    transition: background 0.2s;
}

.paid-btn:hover {
    background: #45a049;
}

.check-icon {
    font-size: 20px;
}

.qr-timer {
    margin-top: 16px;
    font-size: 14px;
    color: #e91e63;
    padding: 10px 16px;
    border-radius: 10px;
    border: 1px dashed #e91e63;
    background: #fff5f7;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.qr-timer .expiry-timer {
    font-weight: 700;
    color: #c2185b;
}

/* Confirmation Popup */
.popup-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.popup-overlay.active {
    display: flex;
}

.popup-content {
    background: white;
    border-radius: 16px;
    padding: 32px 24px;
    max-width: 400px;
    width: 100%;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.popup-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.popup-title {
    font-size: 20px;
    font-weight: 700;
    color: #333;
    margin-bottom: 12px;
}

.popup-message {
    font-size: 14px;
    color: #666;
    line-height: 1.6;
    margin-bottom: 24px;
}

.popup-confirm-btn {
    width: 100%;
    background: #1a237e;
    color: white;
    border: none;
    border-radius: 12px;
    padding: 14px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    margin-bottom: 12px;
    transition: background 0.2s;
}

.popup-confirm-btn:hover {
    background: #283593;
}

.popup-cancel-btn {
    width: 100%;
    background: transparent;
    color: #666;
    border: none;
    padding: 12px;
    font-size: 14px;
    cursor: pointer;
    transition: color 0.2s;
}

.popup-cancel-btn:hover {
    color: #333;
}

/* Payment Verification Result Popup */
.result-popup-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 20px;
    animation: fadeIn 0.3s ease;
}

.result-popup-overlay.show {
    display: flex;
}

.result-popup-content {
    background: white;
    border-radius: 20px;
    padding: 40px 32px;
    max-width: 420px;
    width: 100%;
    text-align: center;
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    overflow: hidden;
}

.result-popup-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #4caf50, #45a049);
}

.result-popup-content.error::before {
    background: linear-gradient(90deg, #f44336, #d32f2f);
}

.result-popup-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4caf50, #45a049);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    margin: 0 auto 24px;
    animation: scaleIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 8px 24px rgba(76, 175, 80, 0.3);
}

.result-popup-icon.error {
    background: linear-gradient(135deg, #f44336, #d32f2f);
    box-shadow: 0 8px 24px rgba(244, 67, 54, 0.3);
}

.result-popup-icon.success-animation {
    animation: successPulse 0.6s ease;
}

.result-popup-title {
    font-size: 24px;
    font-weight: 700;
    color: #333;
    margin-bottom: 12px;
    animation: fadeInUp 0.5s ease 0.2s both;
}

.result-popup-message {
    font-size: 16px;
    color: #666;
    line-height: 1.6;
    margin-bottom: 20px;
    animation: fadeInUp 0.5s ease 0.3s both;
}

.result-popup-details {
    background: #f5f5f5;
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 24px;
    font-size: 14px;
    color: #555;
    line-height: 1.8;
    text-align: left;
    animation: fadeInUp 0.5s ease 0.4s both;
}

.result-popup-details strong {
    color: #333;
    font-weight: 600;
}

.result-popup-btn {
    width: 100%;
    background: linear-gradient(135deg, #1a237e, #283593);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 16px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 16px rgba(26, 35, 126, 0.3);
    animation: fadeInUp 0.5s ease 0.5s both;
}

.result-popup-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 35, 126, 0.4);
}

.result-popup-btn:active {
    transform: translateY(0);
}

.result-popup-btn.error-btn {
    background: linear-gradient(135deg, #f44336, #d32f2f);
    box-shadow: 0 4px 16px rgba(244, 67, 54, 0.3);
}

.result-popup-btn.error-btn:hover {
    box-shadow: 0 6px 20px rgba(244, 67, 54, 0.4);
}

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

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes scaleIn {
    from {
        transform: scale(0);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes successPulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

/* Verification Form Card */
.verification-form-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.form-field {
    margin-bottom: 24px;
}

.form-label {
    display: block;
    font-size: 12px;
    font-weight: 700;
    color: #333;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-input {
    width: 100%;
    padding: 14px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    color: #333;
    transition: border-color 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: #7b2cbf;
}

.form-warning {
    font-size: 12px;
    color: #d32f2f;
    margin-top: 6px;
    font-weight: 500;
}

.file-upload-area {
    width: 100%;
    padding: 14px;
    border: 2px dashed #e0e0e0;
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 14px;
    color: #666;
}

.file-upload-area:hover {
    border-color: #7b2cbf;
    background: #f9f5ff;
}

.upload-icon {
    font-size: 20px;
}

.preview-image {
    width: 100%;
    margin-top: 12px;
    border-radius: 8px;
    display: none;
    max-height: 300px;
    object-fit: contain;
}

.preview-image.show {
    display: block;
}

.submit-btn {
    width: 100%;
    background: #4caf50;
    color: white;
    border: none;
    border-radius: 12px;
    padding: 16px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    margin-top: 8px;
    transition: background 0.2s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.submit-btn:hover {
    background: #45a049;
}

.submit-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
}

/* Footer */
.footer-powered {
    text-align: center;
    font-size: 12px;
    color: #999;
    padding: 16px 0;
    font-weight: 500;
}

/* Status Messages */
.status {
    margin-top: 16px;
    font-size: 14px;
    text-align: center;
    min-height: 20px;
    padding: 12px;
    border-radius: 8px;
}

.status.success {
    background: #e8f5e9;
    color: #2e7d32;
    font-weight: 600;
}

.status.error {
    background: #ffebee;
    color: #c62828;
    font-weight: 600;
}

/* Error Message */
.error {
    background: #ffebee;
    color: #c62828;
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 15px;
    display: none;
    font-size: 14px;
}

/* Loading Spinner */
.loading {
    text-align: center;
    padding: 40px 20px;
    color: #666;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #1a237e;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

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

.hidden {
    display: none;
}

/* Responsive Design */
@media (max-width: 480px) {
    .container {
        padding: 16px;
    }
    
    .header-bar {
        padding: 12px 16px;
    }
    
    .header-title {
        font-size: 16px;
    }
    
    .header-subtitle {
        font-size: 11px;
    }
    
    .order-card,
    .payment-options-card,
    .qr-card,
    .verification-form-card {
        padding: 16px;
    }
}