/* General Styling / 基础样式 */
body {
    font-family: system-ui, -apple-system, sans-serif;
    background-color: #f9fafb;
    margin: 0;
    padding: 2rem;
    color: #374151;
}

/* Breadcrumb Styling / 面包屑样式 */
.breadcrumb-nav {
    background: #ffffff;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    display: inline-block;
}

.breadcrumb-list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
}

/* List Items / 列表项 */
.breadcrumb-list li {
    display: flex;
    align-items: center;
    font-size: 0.95rem;
}

/* The Separator / 分隔符 
   Using CSS generated content (::after) means the separator is NOT 
   picked up by screen readers as content, which is better for accessibility.
   使用 CSS 生成的内容（::after）意味着分隔符不会被屏幕阅读器识别为实际内容。
*/
.breadcrumb-list li:not(:last-child)::after {
    content: "›";
    margin: 0 10px;
    color: #9ca3af;
    font-size: 1.2rem;
}

.breadcrumb-list a {
    color: #2563eb;
    text-decoration: none;
    transition: color 0.2s;
}

.breadcrumb-list a:hover {
    color: #1d4ed8;
    text-decoration: underline;
}

/* Current Page / 当前页面 */
.breadcrumb-list li[aria-current="page"] {
    color: #6b7280;
    font-weight: 600;
}

/* Explanation UI / 说明界面 */
.explanation-container {
    margin-top: 3rem;
    max-width: 1000px;
}

.info-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
}

/* SEO Insight Box Styling / SEO 见解区块样式 */
.seo-insight-box {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 2.5rem;
    background: #ffffff;
    border-radius: 12px;
    border: 1px solid #e5e7eb; /* Matches var(--border) in your styles.css */
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.seo-insight-box h2 {
    color: #2563eb; /* Matches your accent color */
    font-size: 1.5rem;
    margin-top: 0;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid #f3f4f6;
    padding-bottom: 0.5rem;
}

.insight-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
}

.seo-insight-box article h3 {
    font-size: 1.15rem;
    margin-bottom: 1rem;
    color: #111827;
}

.seo-insight-box p {
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 1.2rem;
    color: #374151;
}

.seo-insight-box p[lang="zh"] {
    color: #6b7280;
    font-size: 0.9rem;
    border-left: 3px solid #eff6ff;
    padding-left: 1rem;
}

@media (max-width: 768px) {
    .insight-grid { grid-template-columns: 1fr; }
}


/* Footer Styling */
.pattern-footer {
    max-width: 1000px;
    margin: 4rem auto;
    padding: 2rem 1rem;
    text-align: center;
}

.back-nav a {
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 600;
}

.corporate-links {
    margin-top: 2rem;
    font-size: 0.9rem;
    color: #64748b;
}

.corporate-links a {
    color: var(--accent-blue);
    text-decoration: none;
}

@media (max-width: 768px) {
    .insight-grid { grid-template-columns: 1fr; }
}