:root {
            --primary-color: #1a73e8;
            --secondary-color: #4285f4;
            --text-color: #202124;
            --light-gray: #f8f9fa;
        }
        
        body {
            font-family: 'Helvetica Neue', Arial, sans-serif;
            <?php if (!empty($backgroundImage)): ?>
            background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('<?php echo $backgroundImage; ?>');
            background-position: center;
            background-size: cover;
            background-repeat: no-repeat;
            background-attachment: fixed;
            <?php else: ?>
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            <?php endif; ?>
            min-height: 100vh;
            margin: 0;
            padding: 0;
        }
        
        .register-container {
            display: flex;
            min-height: 100vh;
            padding: 20px;
        }
        
        .left-section {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            padding: 40px;
            <?php if (!empty($backgroundImage)): ?>
            background: rgba(255, 255, 255, 0.85);
            <?php else: ?>
            background: rgba(255, 255, 255, 0.9);
            <?php endif; ?>
            border-radius: 20px;
            margin-right: 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }
        
        .right-section {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            padding: 40px;
        }
        
        .brand-title {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 10px;
        }
        
        .brand-subtitle {
            font-size: 0.8rem;
            color: #666;
            margin-bottom: 0px;
        }
        
        .info-section {
            margin-bottom: 40px;
        }
        
        .info-title {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--text-color);
            margin-bottom: 15px;
        }
        
        .info-text {
            color: #666;
            line-height: 1.6;
            margin-bottom: 15px;
        }
        
        .highlighted {
            background-color: #e8f0fe;
            padding: 2px 6px;
            border-radius: 4px;
            color: var(--primary-color);
        }
        
        .info-list {
            list-style: none;
            padding: 0;
            margin: 15px 0;
        }
        
        .info-list li {
            margin-bottom: 10px;
            padding-left: 25px;
            position: relative;
        }
        
        .info-list li:before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--primary-color);
        }
        
        .form-container {
            background: white;
            padding: 40px;
            border-radius: 20px;
            <?php if (!empty($backgroundImage)): ?>
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            background: rgba(255, 255, 255, 0.95);
            <?php else: ?>
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            <?php endif; ?>
            max-width: 400px;
            width: 100%;
        }
        
        .form-title {
            font-size: 1.8rem;
            font-weight: 600;
            color: var(--text-color);
            margin-bottom: 30px;
            text-align: center;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-label {
            font-weight: 500;
            color: var(--text-color);
            margin-bottom: 8px;
        }
        
        .form-control {
            padding: 12px 15px;
            border-radius: 8px;
            border: 1px solid #ddd;
            transition: all 0.3s ease;
        }
        
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.2);
        }
        
        .btn-register {
            background: var(--primary-color);
            color: white;
            padding: 12px;
            border-radius: 8px;
            border: none;
            width: 100%;
            font-weight: 500;
            transition: all 0.3s ease;
        }
        
        .btn-register:hover {
            background: var(--secondary-color);
            transform: translateY(-2px);
        }
        
        .form-footer {
            text-align: center;
            margin-top: 20px;
        }
        
        .form-footer a {
            color: var(--primary-color);
            text-decoration: none;
            transition: all 0.3s ease;
        }
        
        .form-footer a:hover {
            text-decoration: underline;
        }
        
        .password-field {
            position: relative;
        }
        
        .password-toggle {
            position: absolute;
            right: 15px;
            top: 50%;
            transform: translateY(-50%);
            cursor: pointer;
            color: #666;
        }
        
        .agree-terms {
            margin: 20px 0;
        }
        
        .form-check {
            margin-bottom: 10px;
        }
        
        .form-check-input {
            margin-right: 8px;
        }
        
        .form-check-label {
            color: #666;
        }
        
        @media (max-width: 992px) {
            .register-container {
                flex-direction: column;
                padding: 10px;
            }
            
            .left-section {
                margin-right: 0;
                margin-bottom: 20px;
                padding: 30px;
                order: 2;
            }
            
            .right-section {
                padding: 20px;
                order: 1;
                margin-bottom: 20px;
            }
            
            .form-container {
                margin: 0 auto;
            }
        }
        
        @media (max-width: 576px) {
            .brand-title {
                font-size: 2rem;
            }
            
            .info-title {
                font-size: 1.3rem;
            }
            
            .form-container {
                padding: 30px;
            }
        }
        
        .photo-credit {
            position: fixed;
            bottom: 10px;
            right: 10px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.75rem;
            padding: 5px 10px;
            background-color: rgba(0, 0, 0, 0.5);
            border-radius: 20px;
            z-index: 100;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
        }
        
        .captcha-container {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .captcha-image {
            border: 1px solid #ddd;
            border-radius: 6px;
            cursor: pointer;
            transition: opacity 0.3s ease;
        }
        
        .captcha-image:hover {
            opacity: 0.8;
        }
        
        .captcha-refresh {
            color: var(--primary-color);
            cursor: pointer;
            font-size: 18px;
            transition: color 0.3s ease;
        }
        
        .captcha-refresh:hover {
            color: var(--secondary-color);
        }
        
        .captcha-input {
            max-width: 120px;
        }
        
        .form-group .input-group {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        /* 用户协议弹窗样式 */
        .modal-dialog {
            max-width: 800px;
        }
        
        .modal-header {
            background-color: #f8f9fa;
            border-bottom: 2px solid #e9ecef;
        }
        
        .modal-title {
            font-weight: 600;
            color: #333;
        }
        
        .agreement-content {
            line-height: 1.6;
        }
        
        .parties-info {
            background-color: #f8f9fa;
            border-radius: 8px;
            padding: 20px;
            margin-bottom: 25px;
        }
        
        .party-box {
            background-color: white;
            border-radius: 6px;
            padding: 15px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        
        .party-title {
            color: #333;
            font-weight: 600;
            margin-bottom: 10px;
            border-bottom: 1px solid #e9ecef;
            padding-bottom: 5px;
        }
        
        .party-details div {
            margin-bottom: 5px;
        }
        
        .agreement-section {
            margin-bottom: 25px;
            border-left: 4px solid var(--primary-color);
            padding-left: 15px;
        }
        
        .section-title {
            color: #333;
            font-weight: 600;
            margin-bottom: 15px;
            font-size: 1.1rem;
        }
        
        .section-content h6 {
            color: #555;
            font-weight: 600;
            margin-top: 15px;
            margin-bottom: 8px;
        }
        
        .section-content p {
            margin-bottom: 10px;
            color: #666;
        }
        
        .section-content ul {
            margin-bottom: 15px;
        }
        
        .section-content li {
            margin-bottom: 5px;
            color: #666;
        }
        
        .signature-area {
            background-color: #f8f9fa;
            border-radius: 8px;
            padding: 20px;
            border: 2px dashed #dee2e6;
        }
        
        .signature-box {
            text-align: center;
        }
        
        .signature-box h6 {
            color: #333;
            font-weight: 600;
            margin-bottom: 10px;
        }
        
        .signature-note {
            color: #28a745;
            font-size: 0.9rem;
            margin-bottom: 10px;
        }
        
        .signature-platform {
            color: var(--primary-color);
            font-weight: 600;
            font-size: 1.1rem;
            margin-bottom: 10px;
        }
        
        .signature-date {
            color: #666;
            font-size: 0.9rem;
        }
        
        .modal-footer {
            background-color: #f8f9fa;
            border-top: 2px solid #e9ecef;
        }
        
        /* 隐私政策样式 */
        .privacy-content {
            line-height: 1.6;
            color: #333;
        }
        
        .policy-overview {
            border-bottom: 1px solid #eee;
            padding-bottom: 20px;
        }
        
        .policy-intro {
            font-size: 1.1rem;
            color: #555;
            margin-bottom: 0;
        }
        
        .privacy-section {
            margin-bottom: 25px;
            padding-bottom: 20px;
            border-bottom: 1px solid #f0f0f0;
        }
        
        .privacy-section:last-child {
            border-bottom: none;
            margin-bottom: 0;
        }
        
        .privacy-section .section-title {
            color: #2c3e50;
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 15px;
            padding-bottom: 8px;
            border-bottom: 2px solid #28a745;
        }
        
        .privacy-section .section-content h6 {
            color: #34495e;
            font-size: 1rem;
            font-weight: 600;
            margin-top: 15px;
            margin-bottom: 10px;
        }
        
        .privacy-section .section-content ul {
            margin-bottom: 15px;
            padding-left: 20px;
        }
        
        .privacy-section .section-content li {
            margin-bottom: 8px;
            line-height: 1.5;
        }
        
        .privacy-section .section-content strong {
            color: #2c3e50;
        }
        
        .contact-info {
            background-color: #f8f9fa;
            padding: 15px;
            border-radius: 8px;
            border-left: 4px solid #28a745;
        }
        
        .contact-item {
            display: flex;
            align-items: center;
            margin-bottom: 10px;
            font-size: 0.95rem;
        }
        
        .contact-item:last-child {
            margin-bottom: 0;
        }
        
        .contact-item i {
            width: 20px;
            margin-right: 8px;
        }