/**
 * SEO 与 GEO（大模型收录优化）辅助样式模块
 * —— 面包屑、面向检索摘要的业务上下文条、站点概要卡片、屏幕阅读器专用区（含 llms.txt 发现链接）
 */

/* 面包屑（含微数据友好结构时可配合 itemscope） */
.seo-breadcrumb {
    font-size: 14px;
    color: var(--gray, #6b7280);
    margin: 0 0 8px;
    padding: 10px 0 16px;
    border-bottom: 1px solid #e5e7eb;
}
.seo-breadcrumb ol {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
}
.seo-breadcrumb li {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.seo-breadcrumb li:not(:last-child)::after {
    content: "/";
    color: #d1d5db;
    margin-left: 6px;
    font-weight: 400;
}
.seo-breadcrumb a {
    color: var(--primary, #0a66c2);
    text-decoration: none;
}
.page-hero .seo-breadcrumb,
.about-hero .seo-breadcrumb {
    border-bottom-color: rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.95);
}
.page-hero .seo-breadcrumb a,
.about-hero .seo-breadcrumb a {
    color: #fff;
    text-decoration: underline;
    text-underline-offset: 3px;
}
.page-hero .seo-breadcrumb li:not(:last-child)::after,
.about-hero .seo-breadcrumb li:not(:last-child)::after {
    color: rgba(255, 255, 255, 0.5);
}

/**
 * 产品中心等：Hero 下方全宽面包屑条，缓和 Banner 与正文割裂；保留 BreadcrumbList 微数据。
 */
.seo-breadcrumb-wrap--below-hero {
    position: relative;
    z-index: 2;
    margin-top: -14px;
    padding-top: 2px;
    background: linear-gradient(180deg, #f1f5f9 0%, #ffffff 42%);
    border-bottom: 1px solid rgba(148, 163, 184, 0.35);
    box-shadow: 0 8px 24px -12px rgba(15, 23, 42, 0.12);
}
.seo-breadcrumb-wrap--below-hero .container {
    max-width: 1280px;
}
.seo-breadcrumb.seo-breadcrumb--strip {
    margin: 0;
    padding: 15px 4px 17px;
    border-bottom: none;
    font-size: 15px;
    line-height: 1.45;
    color: #64748b;
}
.seo-breadcrumb.seo-breadcrumb--strip ol {
    gap: 4px 10px;
    align-items: center;
}
.seo-breadcrumb.seo-breadcrumb--strip li:not(:last-child)::after {
    content: "/";
    color: #cbd5e1;
    margin-left: 10px;
    font-weight: 300;
    font-size: 0.92em;
    opacity: 0.95;
}
.seo-breadcrumb.seo-breadcrumb--strip a {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    font-weight: 600;
    color: var(--primary, #0a66c2);
    text-decoration: none;
    padding: 6px 10px;
    margin: -6px -10px;
    border-radius: 10px;
    transition: background 0.18s ease, color 0.18s ease;
}
.seo-breadcrumb.seo-breadcrumb--strip a:hover {
    background: rgba(10, 102, 194, 0.1);
    color: var(--primary-dark, #084b8a);
}
.seo-breadcrumb.seo-breadcrumb--strip a:focus-visible {
    outline: 2px solid var(--primary, #0a66c2);
    outline-offset: 2px;
}
.seo-breadcrumb.seo-breadcrumb--strip a .seo-bc-icon {
    font-size: 0.88em;
    opacity: 0.88;
}
.seo-breadcrumb.seo-breadcrumb--strip li:last-child {
    color: #0f172a;
    font-weight: 700;
    letter-spacing: 0.02em;
}
.seo-breadcrumb.seo-breadcrumb--strip li:last-child span[itemprop="name"] {
    padding: 6px 2px;
    display: inline-block;
}
.seo-breadcrumb.seo-breadcrumb--strip li[aria-current="page"] span[itemprop="name"] {
    position: relative;
    padding-left: 10px;
}
.seo-breadcrumb.seo-breadcrumb--strip li[aria-current="page"] span[itemprop="name"]::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 1em;
    background: linear-gradient(180deg, var(--primary, #0a66c2), var(--nav-accent, #e31c1c));
    border-radius: 2px;
    opacity: 0.9;
}
@media (max-width: 768px) {
    .seo-breadcrumb-wrap--below-hero {
        margin-top: -8px;
    }
    .seo-breadcrumb.seo-breadcrumb--strip {
        font-size: 14px;
        padding: 12px 2px 14px;
    }
}

/* 业务上下文摘要条：给人读与给模型抽取用（非地理 SEO） */
.seo-geo-strap {
    background: linear-gradient(90deg, #eff6ff 0%, #f8fafc 100%);
    border-left: 4px solid var(--primary, #0a66c2);
    padding: 12px 18px;
    margin: 20px 0 0;
    border-radius: 0 12px 12px 0;
    font-size: 14px;
    line-height: 1.55;
    color: var(--gray-dark, #1f2937);
}

/* 首页等业务概要区块（层级清晰，便于生成式引擎抽取） */
.seo-keyfacts {
    padding: 48px 0 56px;
    background: var(--gray-light, #f3f4f6);
    margin-top: 48px;
}
.seo-keyfacts-inner {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}
.seo-keyfact-card {
    background: #fff;
    padding: 22px 22px 20px;
    border-radius: 18px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.05);
}
.seo-keyfact-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 10px;
    color: var(--primary-dark, #084b8a);
}
.seo-keyfact-card p {
    margin: 0;
    font-size: 14px;
    line-height: 1.65;
    color: var(--gray, #6b7280);
}

/* 仅对屏幕阅读器可见（保留标题语义，不干扰视觉布局） */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}