* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #87CEEB 0%, #4682B4 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }
        
        .container {
            background: white;
            border-radius: 12px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
            padding: 30px;
            width: 100%;
            max-width: 450px;
            transition: all 0.3s ease;
        }
        
        .container:hover {
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
        }
        
        h1 {
            text-align: center;
            color: #2c3e50;
            margin-bottom: 25px;
            font-size: 28px;
            font-weight: 600;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #555;
            font-weight: 500;
            font-size: 14px;
        }
        
        .form-group input,
        .form-group select {
            width: 100%;
            padding: 8px 15px;
            border: 2px solid #e1e8ed;
            border-radius: 8px;
            font-size: 16px;
            line-height: 1.5;
            transition: all 0.3s ease;
            background: #fafafa;
        }
        
        .form-group input:focus,
        .form-group select:focus {
            outline: none;
            border-color: #87CEEB;
            background: white;
            box-shadow: 0 0 0 3px rgba(135, 206, 235, 0.1);
        }
        
        /* 验证码容器样式 - 实现验证码内嵌在输入框右侧 */
        .captcha-container {
            position: relative;
            display: flex;
            align-items: center;
        }
        
        /* 验证码输入框样式 */
        .captcha-container input {
            width: 100%;
            padding: 8px 15px 8px 15px;
            font-size: 16px;
            line-height: 1.5;
            height: 40px;
            padding-right: 100px; /* 为验证码图片留出空间 */
        }
        
        /* 验证码图片样式 - 绝对定位在输入框右侧 */
        .captcha-img {
            position: absolute;
            right: 2px;
            top: 50%;
            transform: translateY(-50%);
            width: 90px;
            height: 36px;
            border-radius: 6px;
            cursor: pointer;
            border: none;
            transition: all 0.3s ease;
            vertical-align: middle;
            border-left: 1px solid #e1e8ed; /* 添加左侧垂直分割线 */
            padding-left: 5px; /* 给分割线添加一点间距 */
        }
        
        .captcha-img:hover {
            opacity: 0.8;
        }
        
        .error {
            background: #fff5f5;
            color: #e53e3e;
            padding: 12px;
            border-radius: 8px;
            margin-bottom: 20px;
            border-left: 4px solid #e53e3e;
            font-size: 14px;
        }
        
        .success {
            background: #f0fff4;
            color: #38a169;
            padding: 12px;
            border-radius: 8px;
            margin-bottom: 20px;
            border-left: 4px solid #38a169;
            font-size: 14px;
        }
        
        .btn {
            width: 100%;
            padding: 8px 15px;
            background: #87CEEB;
            color: white;
            border: 2px solid #87CEEB;
            border-radius: 8px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            line-height: 1.5;
            transition: all 0.3s ease;
            margin-bottom: 10px;
        }
        
        .btn:hover {
            background: #4682B4;
            border-color: #4682B4;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(135, 206, 235, 0.3);
        }
        
        .btn:active {
            transform: translateY(0);
        }
        
        .btn-secondary {
            background: #e2e8f0;
            color: #4a5568;
            border-color: #e2e8f0;
        }
        
        .btn-secondary:hover {
            background: #cbd5e0;
            border-color: #cbd5e0;
            box-shadow: 0 4px 12px rgba(148, 163, 184, 0.3);
        }
        
        .form-toggle {
            text-align: center;
            margin-top: 15px;
            font-size: 14px;
            color: #666;
        }
        
        .form-toggle a {
            color: #87CEEB;
            text-decoration: none;
            font-weight: 600;
            transition: color 0.3s ease;
        }
        
        .form-toggle a:hover {
            color: #4682B4;
            text-decoration: underline;
        }
        
        .register-fields {
            display: none;
        }
        
        /* 一体化输入框容器 */
        .integrated-input {
            display: flex;
            background: #fafafa;
            border-radius: 8px;
            overflow: hidden;
        }
        
        /* 一体化输入框中的选择器 */
        .integrated-input select {
            min-width: auto;
            width: fit-content;
            padding: 8px 10px;
            border: 2px solid #e1e8ed;
            border-right: 2px solid #e1e8ed;
            background: #fafafa;
            font-size: 16px;
            max-width: 80px;
            cursor: pointer;
            line-height: 1.5;
            border-radius: 8px 0 0 8px;
        }
        
        /* 一体化输入框中的输入框 */
        .integrated-input input {
            flex: 1;
            border: 2px solid #e1e8ed;
            border-left: none;
            padding: 8px 15px;
            background: #fafafa;
            font-size: 16px;
            outline: none;
            line-height: 1.5;
            border-radius: 0 8px 8px 0;
        }
        
        /* 一体化输入框中的选择器聚焦效果 */
        .integrated-input select:focus {
            outline: none;
            border-color: #87CEEB;
            border-right-color: #87CEEB;
            background: white;
        }
        
        /* 一体化输入框中的输入框聚焦效果 */
        .integrated-input input:focus {
            outline: none;
            border-color: #87CEEB;
            background: white;
        }
        
        /* 当选择器聚焦时，输入框左侧边框也变为主题色 */
        .integrated-input select:focus + input {
            border-left: none;
            border-color: #87CEEB;
            background: white;
        }
        
        /* 当输入框聚焦时，选择器右侧边框也变为主题色 */
        .integrated-input input:focus {
            border-color: #87CEEB;
            background: white;
        }
        
        .integrated-input input:focus + select {
            border-right-color: #87CEEB;
        }
        
        /* 响应式设计 */
        @media (max-width: 480px) {
            /* 一体化输入框在移动端保持不变，因为已经是紧凑设计 */
            .integrated-input {
                flex-direction: row;
            }
            
            .integrated-input select,
            .integrated-input input {
                width: auto;
                border-radius: 0;
            }
            
            .integrated-input select {
                max-width: 80px;
            }
            
            .container {
                padding: 20px;
            }
            
            h1 {
                font-size: 24px;
            }
            
            /* 验证码容器在移动端保持不变，因为已经是紧凑设计 */
            .captcha-container {
                position: relative;
            }
            
            /* 验证码图片在移动端保持固定尺寸，不拉伸 */
            .captcha-img {
                position: absolute;
                right: 2px;
                top: 50%;
                transform: translateY(-50%);
                width: 90px !important;
                height: 36px;
                padding-left: 5px;
            }
            
            /* 验证码输入框在移动端保持右侧内边距，为验证码图片留出空间 */
            .captcha-container input {
                padding-right: 100px !important;
            }
        }