* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    background-color: #f5f7fa;
    color: #333;
    padding: 0;
    overflow-x: hidden;
}
.container {
    display: flex;
    flex-direction: column;
    max-width: 100%;
    margin: 0 auto;
}
.image-section {
    width: 100%;
    margin: 0;
    overflow: hidden;
    position: relative;
}
.image-section img {
    width: 100%;
    display: block;
}
/* 新增：去除黑边的类 */
.no-black-borders img {
    object-fit: cover;
}
        
        .header {
            width: 100%;
            height: 100vh;
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background: #f8f9fa;
            flex-shrink: 0;
        }
        
        .header img {
            width: 100%;
            height: 100vh;
            object-fit: cover;
        }
        
        .progress-bar {
            height: 6px;
            flex-shrink: 0;
        }
        .progress-bar h2 {
            font-size:20px;
            margin-bottom: 30px;
            color: #FF0000;
            text-align: center;
            line-height: 1.4;
        }
        
        .progress {
            height: 100%;
            background: #4b6cb7;
            width: 0%;
            transition: width 0.5s ease;
        }
        
        .question-container {
            flex: 1;
            padding: 20px;
            display: flex;
            flex-direction: column;
            overflow-y: auto;
        }
        
        .question {
            display: none;
            flex: 1;
            flex-direction: column;
            justify-content: center;
            animation: fadeIn 0.5s ease;
        }
        
        .question.active {
            display: flex;
        }
        
        .question h2 {
            font-size: 18px;
            margin-bottom: 30px;
            color: #2c3e50;
            text-align: center;
            line-height: 1.4;
        }
        
        .options {
            display: flex;
            flex-direction: column;
            gap: 15px;
            margin-bottom: 20px;
        }
        
        .option {
            padding: 18px 20px;
            border: 2px solid #e0e0e0;
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: center;
            font-size: 16px;
            background: white;
            min-height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .option:hover {
            border-color: #4b6cb7;
            background-color: #f8faff;
        }
        
        .option.selected {
            border-color: #4b6cb7;
            background-color: #edf2ff;
        }
        
        .phone-form {
            display: none;
            flex: 1;
            padding: 30px 25px;
            text-align: center;
            animation: fadeIn 0.5s ease;
            flex-direction: column;
            justify-content: center;
        }
        
        .phone-form h2 {
            font-size: 22px;
            margin-bottom: 20px;
            color: #2c3e50;
        }
        
        .phone-form p {
            color: #666;
            margin-bottom: 30px;
            font-size: 16px;
            line-height: 1.5;
        }
        
        .form-group {
            margin-bottom: 25px;
            text-align: left;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 10px;
            font-weight: 500;
            color: #444;
            font-size: 16px;
        }
        
        .form-group input {
            width: 100%;
            padding: 16px 15px;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            font-size: 16px;
            transition: border-color 0.3s;
        }
        
        .form-group input:focus {
            border-color: #4b6cb7;
            outline: none;
        }
        
        .btn-submit {
            background: #4b6cb7;
            width: 100%;
            padding: 18px;
            font-size: 18px;
            font-weight: 500;
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: background 0.3s;
            margin-top: 10px;
        }
        
        .btn-submit:hover {
            background: #4b6cb7;
        }
        
        .btn-submit:disabled {
            background: #cccccc;
            cursor: not-allowed;
        }
        
        .loading {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255,255,255,.3);
            border-radius: 50%;
            border-top-color: #fff;
            animation: spin 1s ease-in-out infinite;
            margin-right: 10px;
        }
        
        .success-message, .not-qualified, .already-submitted {
            display: none;
            flex: 1;
            padding: 40px 30px;
            text-align: center;
            animation: fadeIn 0.5s ease;
            flex-direction: column;
            justify-content: center;
        }
        
        .success-message h2 {
            color: #4CAF50;
            margin-bottom: 20px;
            font-size: 22px;
        }
        
        .not-qualified h2, .already-submitted h2 {
            color: #e74c3c;
            margin-bottom: 20px;
            font-size: 22px;
        }
        
        .success-message p, .not-qualified p, .already-submitted p {
            color: #666;
            margin-bottom: 15px;
            font-size: 16px;
            line-height: 1.5;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
/* 在线客服按钮 */
.customer-service-btn {
    position: fixed;
    right: 15px;
    bottom: 360px;
    width: 55px;
    height: 55px;
    background: #FF0000;
    color: white;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
    z-index: 999;
    text-decoration: none;
}

.customer-service-btn i {
    font-size: 22px;
    margin-bottom: 3px;
}

.customer-service-btn span {
    font-size: 16px;
}
        /* 防止iOS Safari的弹性滚动 */
        .question-container, .phone-form, .success-message, .not-qualified, .already-submitted {
            -webkit-overflow-scrolling: touch;
        }

        /* 适配不同屏幕高度 */
        @media (max-height: 700px) {
            .header {
                height: 20vh;
                min-height: 150px;
            }
            
            .question h2 {
                margin-bottom: 20px;
            }
            
            .option {
                padding: 15px 20px;
                min-height: 55px;
            }
        }

        @media (max-height: 600px) {
            .header {
                height: 18vh;
                min-height: 130px;
            }
            
            .question-container {
                padding: 15px;
            }
            
            .question h2 {
                font-size: 17px;
                margin-bottom: 15px;
            }
            
            .option {
                padding: 12px 15px;
                min-height: 50px;
                font-size: 15px;
            }
        }