/* 快速导航 */
.quick-nav {
    padding: 40px 0;
    background: white;
    border-bottom: 1px solid #e9ecef;
}

.nav-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.nav-tab {
    padding: 12px 24px;
    border: 2px solid #e9ecef;
    background: white;
    color: #666;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-tab:hover,
.nav-tab.active {
    border-color: #ff6b35;
    background: #ff6b35;
    color: white;
}

/* 内容区域 */
.content-section {
    padding: 60px 0;
    background: #f8f9fa;
}

.content-section:nth-child(even) {
    background: white;
}

/* 使用教程 */
.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.tutorial-step {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
}

.tutorial-step:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.step-number {
    position: absolute;
    top: -20px;
    left: 20px;
    width: 40px;
    height: 40px;
    background: #ff6b35;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
}

.step-content {
    margin-top: 1rem;
}

.step-content h3 {
    font-size: 1.3rem;
    font-weight: bold;
    color: #000;
    margin-bottom: 1rem;
}

.step-content p {
    color: #666;
    line-height: 1.6;
}

/* 常见问题 */
.faq-list {
    max-width: 800px;
    margin: 3rem auto 0;
}

.faq-item {
    background: white;
    border-radius: 10px;
    margin-bottom: 1rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: #f8f9fa;
}

.faq-question h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #000;
    margin: 0;
}

.faq-question i {
    color: #ff6b35;
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 0 1.5rem 1.5rem;
    max-height: 200px;
}

.faq-answer p {
    color: #666;
    line-height: 1.6;
    margin: 0;
}

/* 用户协议和隐私政策 */
.agreement-content,
.privacy-content {
    max-width: 800px;
    margin: 3rem auto 0;
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.agreement-content h3,
.privacy-content h3 {
    font-size: 1.8rem;
    font-weight: bold;
    color: #000;
    margin-bottom: 1rem;
    text-align: center;
}

.agreement-content h4,
.privacy-content h4 {
    font-size: 1.3rem;
    font-weight: bold;
    color: #333;
    margin: 2rem 0 1rem;
    border-left: 4px solid #ff6b35;
    padding-left: 1rem;
}

.agreement-content h5,
.privacy-content h5 {
    font-size: 1.1rem;
    font-weight: bold;
    color: #333;
    margin: 1.5rem 0 0.5rem;
}

.agreement-content p,
.privacy-content p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.agreement-content strong,
.privacy-content strong {
    color: #333;
}

.agreement-content ul,
.privacy-content ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.agreement-content li,
.privacy-content li {
    color: #666;
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

.agreement-content ul li strong,
.privacy-content ul li strong {
    color: #ff6b35;
    font-weight: 600;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-tabs {
        gap: 0.5rem;
    }
    
    .nav-tab {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .tutorial-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .tutorial-step {
        padding: 1.5rem;
    }
    
    .faq-question h3 {
        font-size: 1rem;
    }
    
    .agreement-content,
    .privacy-content {
        padding: 1.5rem;
        margin: 2rem 1rem 0;
    }
    
    .agreement-content h3,
    .privacy-content h3 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .nav-tab {
        padding: 8px 16px;
        font-size: 0.8rem;
    }
    
    .tutorial-step {
        padding: 1rem;
    }
    
    .step-number {
        width: 35px;
        height: 35px;
        font-size: 1rem;
        top: -15px;
        left: 15px;
    }
    
    .faq-question {
        padding: 1rem;
    }
    
    .faq-answer {
        padding: 0 1rem;
    }
    
    .faq-item.active .faq-answer {
        padding: 0 1rem 1rem;
    }
}