/* ========================================
   底部导航专题页面样式
   关于本站、下载帮助、广告服务、版权声明、联系我们、隐私政策
   ======================================== */

/* ==================== 面包屑导航（与 article-list.html 一致） ==================== */
.breadcrumb {
    background: white;
    padding: 15px 0;
    border-bottom: 1px solid var(--gray-200);
}

.breadcrumb-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.breadcrumb-nav a {
    color: var(--gray-600);
    transition: color var(--transition-fast);
    text-decoration: none;
}

.breadcrumb-nav a:hover {
    color: var(--primary-color);
}

.breadcrumb-nav .separator {
    color: var(--gray-400);
}

.breadcrumb-nav .current {
    color: var(--gray-800);
    font-weight: 500;
}

/* 页面主体布局 */
.main-content {
    padding: 20px 0 40px;
    background: var(--gray-100);
    min-height: calc(100vh - 300px);
    max-width: 1300px;
    margin: 0 auto;
}

.content-wrapper {
    display: flex;
    gap: 20px;
}

/* 左侧主内容区 */
.main-area {
    flex: 1;
    min-width: 0;
}

/* 页面卡片 */
.page-card {
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    border: 1px solid var(--gray-200);
    overflow: hidden;
    margin-bottom: 20px;
}

.page-card:last-child {
    margin-bottom: 0;
}

.page-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--gray-200);
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
}

.page-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--gray-800);
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0;
}

.page-title svg {
    color: var(--primary-color);
    flex-shrink: 0;
}

.page-body {
    padding: 30px 50px;
}

/* 内容区块 */
.content-section {
    margin-bottom: 32px;
}

.content-section:last-child {
    margin-bottom: 0;
}

.section-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
}

.section-text {
    font-size: 15px;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 12px;
}

.section-text:last-child {
    margin-bottom: 0;
}

/* 特性网格 */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 20px;
}

.feature-item {
    background: var(--gray-50);
    border-radius: var(--radius-md);
    padding: 20px;
    border: 1px solid var(--gray-200);
    transition: all 0.3s ease;
}

.feature-item:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transform: translateY(-2px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--primary-color);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
}

.feature-icon.blue {
    background: #3b82f6;
}

.feature-icon.green {
    background: #10b981;
}

.feature-icon.orange {
    background: #f59e0b;
}

.feature-icon.purple {
    background: #8b5cf6;
}

.feature-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 8px;
}

.feature-desc {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.6;
}

/* 时间线 */
.timeline {
    position: relative;
    padding-left: 24px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gray-300);
}

.timeline-item {
    position: relative;
    padding-bottom: 24px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -22px;
    top: 4px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--primary-color);
    border: 2px solid #fff;
    box-shadow: 0 0 0 2px var(--primary-color);
}

.timeline-date {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.timeline-content h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 4px;
}

.timeline-content p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.6;
}

/* 步骤列表 */
.step-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.step-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.step-number {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary-color);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 16px;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
    padding-top: 4px;
}

.step-content h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 6px;
}

.step-content p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.6;
}

/* FAQ列表 */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
    overflow: hidden;
}

.faq-question {
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    color: var(--gray-800);
    background: #fff;
    cursor: pointer;
    transition: background 0.2s;
}

.faq-question:hover {
    background: var(--gray-50);
}

.faq-question svg {
    color: var(--primary-color);
    flex-shrink: 0;
}

.faq-answer {
    padding: 16px 20px 16px 48px;
    border-top: 1px solid var(--gray-200);
}

.faq-answer p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 8px;
}

.faq-answer ul {
    margin: 0;
    padding-left: 20px;
}

.faq-answer li {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 4px;
}

/* 通知框 */
.notice-box {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 16px;
}

.notice-item {
    display: flex;
    gap: 16px;
    padding: 16px 20px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
}

.notice-item svg {
    color: var(--primary-color);
    flex-shrink: 0;
    margin-top: 2px;
}

.notice-item h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 4px;
}

.notice-item p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.6;
}

/* 联系列表 */
.contact-list {
    list-style: none;
    padding: 0;
    margin: 16px 0 0;
}

.contact-list li {
    font-size: 15px;
    color: var(--gray-700);
    line-height: 2;
    padding-left: 20px;
    position: relative;
}

.contact-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary-color);
}

/* 广告位列表 */
.ad-position-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 16px;
}

.ad-position-item {
    background: var(--gray-50);
    border-radius: var(--radius-md);
    padding: 20px;
    border: 1px solid var(--gray-200);
    transition: all 0.3s ease;
}

.ad-position-item:hover {
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.1);
}

.ad-position-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.ad-position-header h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-800);
}

.ad-position-tag {
    padding: 4px 10px;
    background: var(--primary-color);
    color: #fff;
    font-size: 12px;
    border-radius: 12px;
}

.ad-position-desc {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: 12px;
}

.ad-position-spec {
    display: flex;
    gap: 20px;
    font-size: 13px;
    color: var(--gray-500);
}

.ad-position-spec span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 联系网格 */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 20px;
}

.contact-card {
    background: var(--gray-50);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
    border: 1px solid var(--gray-200);
    transition: all 0.3s ease;
}

.contact-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transform: translateY(-2px);
}

.contact-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--primary-color);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.contact-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 8px;
}

.contact-info {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.contact-desc {
    font-size: 13px;
    color: var(--gray-500);
}

/* 联系表单 */
.contact-form {
    margin-top: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

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

.form-row .form-group {
    margin-bottom: 0;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.form-label .required {
    color: #ef4444;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 15px;
    color: var(--gray-800);
    background: #fff;
    transition: all 0.2s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

.btn-primary {
    background: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background: #2563eb;
}

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background: var(--gray-300);
}

/* 隐私政策特殊样式 */
.privacy-intro {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    padding: 20px;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
    margin-bottom: 24px;
}

.info-type-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 16px;
}

.info-type-item {
    display: flex;
    gap: 16px;
    padding: 16px 20px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
}

.info-type-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--primary-color);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.info-type-content h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 4px;
}

.info-type-content p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.6;
}

.purpose-list {
    list-style: none;
    padding: 0;
    margin: 16px 0 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.purpose-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 15px;
    color: var(--gray-700);
    padding: 10px 16px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
}

.purpose-list li svg {
    color: #10b981;
    flex-shrink: 0;
}

.security-measures {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 16px;
}

.security-item {
    display: flex;
    gap: 16px;
    padding: 16px 20px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border-left: 4px solid #10b981;
}

.security-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: #10b981;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.security-content h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 4px;
}

.security-content p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.6;
}

.disclosure-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 16px;
}

.disclosure-item {
    padding: 16px 20px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
}

.disclosure-item h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 6px;
}

.disclosure-item p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.6;
}

.cookie-list {
    list-style: none;
    padding: 0;
    margin: 16px 0;
}

.cookie-list li {
    font-size: 15px;
    color: var(--gray-700);
    line-height: 2;
    padding-left: 20px;
    position: relative;
}

.cookie-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary-color);
}

.rights-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: 16px;
}

.rights-item {
    display: flex;
    gap: 12px;
    padding: 16px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
}

.rights-item svg {
    color: var(--primary-color);
    flex-shrink: 0;
}

.rights-item h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 4px;
}

.rights-item p {
    font-size: 13px;
    color: var(--gray-600);
    line-height: 1.5;
}

/* 右侧边栏 */
.sidebar {
    width: 280px;
    flex-shrink: 0;
}

.sidebar .card {
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    border: 1px solid var(--gray-200);
    overflow: hidden;
}

.sidebar .card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--gray-200);
    background: var(--gray-50);
}

.sidebar .card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-800);
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
}

.sidebar .card-body {
    padding: 16px 20px;
}

.related-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.related-links li {
    border-bottom: 1px solid var(--gray-100);
}

.related-links li:last-child {
    border-bottom: none;
}

.related-link {
    display: block;
    padding: 12px 0;
    color: var(--gray-700);
    font-size: 14px;
    text-decoration: none;
    transition: all 0.2s;
}

.related-link:hover {
    color: var(--primary-color);
    padding-left: 8px;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .content-wrapper {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
    }
    
    .feature-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .rights-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .page-body {
        padding: 16px;
    }
    
    .page-title {
        font-size: 18px;
    }
    
    .section-title {
        font-size: 16px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .ad-position-spec {
        flex-direction: column;
        gap: 8px;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .info-type-item,
    .security-item {
        flex-direction: column;
        gap: 12px;
    }
    
    .contact-card {
        padding: 16px;
    }
    
    .contact-info {
        font-size: 16px;
    }
}