/* ========== 帮助中心样式 ========== */
.help-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 16px 40px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* 页面头部 */
.page-header {
    text-align: center;
    padding: 30px 0;
    margin-bottom: 30px;
}

.page-title {
    font-size: 32px;
    font-weight: 700;
    color: #1a1a1a;
    margin: 0 0 10px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    font-size: 16px;
    color: #888;
    margin: 0;
}

/* 主布局 */
.help-main {
    display: flex;
    gap: 30px;
    min-height: 600px;
}

/* 左侧导航 */
.help-sidebar {
    width: 220px;
    flex-shrink: 0;
}

.help-nav {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    overflow: hidden;
    position: sticky;
    top: 20px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 20px;
    color: #555;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: #f8f9fa;
    color: #667eea;
}

.nav-item.active {
    background: linear-gradient(135deg, #667eea0d 0%, #764ba20d 100%);
    color: #667eea;
    border-left-color: #667eea;
    font-weight: 600;
}

.nav-icon {
    font-size: 16px;
    width: 24px;
    text-align: center;
}

/* 右侧内容 */
.help-content {
    flex: 1;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    padding: 30px;
    min-height: 500px;
}

.content-page {
    display: none;
}

.content-page.active {
    display: block;
}

.content-title {
    font-size: 22px;
    font-weight: 700;
    color: #1a1a1a;
    margin: 0 0 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid #f0f0f0;
}

/* FAQ样式 */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.faq-item {
    background: #f8f9fa;
    border-radius: 10px;
    overflow: hidden;
    transition: all 0.3s;
}

.faq-item:hover {
    background: #f0f2f5;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 500;
    color: #333;
    user-select: none;
}

.faq-arrow {
    font-size: 10px;
    color: #999;
    transition: transform 0.3s;
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    padding: 0 20px;
    font-size: 14px;
    color: #666;
    line-height: 1.8;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 20px 16px;
}

/* 回收流程样式 */
.process-steps {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}

.process-step {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 12px;
    transition: all 0.2s;
}

.process-step:hover {
    background: #f0f2f5;
    transform: translateX(5px);
}

.step-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 16px;
    font-weight: 600;
    color: #333;
    margin: 0 0 6px;
}

.step-content p {
    font-size: 14px;
    color: #666;
    margin: 0;
    line-height: 1.6;
}

.process-notice {
    background: #fff8e1;
    border: 1px solid #ffe082;
    border-radius: 10px;
    padding: 16px 20px;
    margin-top: 20px;
}

.process-notice p {
    font-size: 13px;
    color: #795548;
    margin: 4px 0;
    line-height: 1.6;
}

/* 服务协议样式 */
.agreement-content,
.privacy-content {
    font-size: 14px;
    line-height: 1.8;
    color: #444;
}

.agreement-content h3,
.privacy-content h3 {
    font-size: 16px;
    font-weight: 600;
    color: #333;
    margin: 24px 0 12px;
}

.agreement-content ul,
.privacy-content ul {
    padding-left: 20px;
}

.agreement-content li,
.privacy-content li {
    margin-bottom: 8px;
}

.agreement-intro,
.privacy-intro {
    font-size: 14px;
    color: #555;
    margin-bottom: 20px;
    padding: 16px;
    background: #f8f9fa;
    border-radius: 8px;
}

.agreement-footer,
.privacy-footer {
    margin-top: 24px;
    padding: 12px;
    background: #fff8e1;
    border-radius: 8px;
    font-size: 13px;
    color: #795548;
}

/* 回收说明样式 */
.instructions-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.instruction-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: #f8f9fa;
    border-radius: 10px;
    transition: all 0.2s;
}

.instruction-item:hover {
    background: #f0f2f5;
}

.instruction-icon {
    font-size: 20px;
    flex-shrink: 0;
}

.instruction-item p {
    font-size: 14px;
    color: #444;
    margin: 0;
    line-height: 1.6;
}

/* 平台公告样式 */
.notice-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.notice-item {
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    transition: all 0.2s;
}

.notice-item:hover {
    background: #f0f2f5;
}

.notice-date {
    font-size: 12px;
    color: #999;
    margin-bottom: 8px;
}

.notice-title {
    font-size: 15px;
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
}

.notice-item p {
    font-size: 14px;
    color: #666;
    margin: 0;
    line-height: 1.6;
}

/* 联系我们样式 */
.contact-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-method {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
}

.contact-icon {
    font-size: 28px;
}

.contact-method h3 {
    font-size: 16px;
    font-weight: 600;
    color: #333;
    margin: 0 0 6px;
}

.contact-method p {
    font-size: 14px;
    color: #666;
    margin: 2px 0;
    line-height: 1.5;
}

/* 意见反馈样式 */
.feedback-form {
    max-width: 500px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: #555;
    margin-bottom: 8px;
}

.form-input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    transition: all 0.2s;
    background: #fafafa;
    box-sizing: border-box;
}

.form-input:focus {
    border-color: #667eea;
    background: #fff;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

textarea.form-input {
    resize: vertical;
    min-height: 120px;
}

select.form-input {
    cursor: pointer;
}

/* 按钮样式 */
.btn-submit {
    padding: 14px 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 10px;
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

/* 关于我们样式 */
.about-content {
    font-size: 14px;
    line-height: 1.8;
    color: #555;
}

.about-content p {
    margin-bottom: 16px;
}

.business-content .contact-info {
    margin-top: 20px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
}

.business-content .contact-info p {
    font-size: 14px;
    color: #555;
    margin: 8px 0;
}

/* 响应式布局 */
@media (max-width: 768px) {
    .help-main {
        flex-direction: column;
    }
    
    .help-sidebar {
        width: 100%;
    }
    
    .help-nav {
        display: flex;
        flex-wrap: wrap;
        padding: 8px;
        position: static;
    }
    
    .nav-item {
        flex: 1 1 auto;
        padding: 10px 14px;
        font-size: 13px;
        border-left: none;
        border-bottom: 2px solid transparent;
        justify-content: center;
        min-width: 80px;
    }
    
    .nav-item.active {
        border-left-color: transparent;
        border-bottom-color: #667eea;
    }
    
    .help-content {
        padding: 20px;
    }
    
    .page-title {
        font-size: 24px;
    }
}