/* CSS 变量：统一的明亮阿里云科技风 */
:root {
    --bg-color: #f4f7fc;      /* 柔和浅云蓝底色 */
    --card-bg: #ffffff;       /* 纯白卡片背景 */
    --primary-geo: #0064ff;   /* 阿里云经典科技蓝 */
    --primary-hover: #1e80ff; /* 悬浮高亮蓝 */
    --accent-orange: #ff6a00;  /* 阿里云活力橙 */
    --text-main: #1d2129;     /* 墨石黑 */
    --text-muted: #505968;    /* 深灰蓝 */
    --border-color: #e5e8ef;  /* 细腻浅色分隔线 */
    --code-bg: #f8fafe;       /* 浅蓝灰代码块背景 */
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.7;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; }

/* --- 导航栏 --- */
header {
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(8px);
    position: sticky; top: 0; z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 100, 255, 0.03);
}
.nav-box { display: flex; justify-content: space-between; align-items: center; height: 60px; }
.logo { font-size: 1.2rem; font-weight: 700; color: var(--text-main); text-decoration: none; display: flex; align-items: center; gap: 6px; }
.logo span { color: var(--primary-geo); }
.nav-links { display: flex; gap: 15px; list-style: none; }
.nav-links a { color: var(--text-muted); text-decoration: none; font-size: 0.85rem; font-weight: 500; }
.nav-links a.active { color: var(--primary-geo); }

/* ==================== 🗺️ 核心新增：面包屑导航样式（手机端支持横向丝滑滑动） ==================== */
.breadcrumb-wrapper {
    padding: 12px 0;
    margin-bottom: 4px;
}
.breadcrumb {
    display: flex;
    align-items: center;
    list-style: none;
    font-size: 0.82rem;
    gap: 6px;
    white-space: nowrap;       /* 核心：手机端强制不换行 */
    overflow-x: auto;  /* 核心：超出屏幕时支持手指横 axes 滑动 */
    scrollbar-width: none;     /* 隐藏火狐滚动条 */
    -webkit-overflow-scrolling: touch;
}
.breadcrumb::-webkit-scrollbar { display: none; } /* 隐藏 Chrome/Safari 滚动条 */

.breadcrumb li { display: flex; align-items: center; color: var(--text-muted); }
.breadcrumb li a { color: var(--text-muted); text-decoration: none; transition: color 0.2s; }
.breadcrumb li a:hover { color: var(--primary-geo); }
/* 间隔斜杠符号 */
.breadcrumb li::after {
    content: "/";
    margin-left: 6px;
    color: #c0c6d0;
}
/* 最后一项（当前文章页）置灰并取消斜杠 */
.breadcrumb li:last-child {
    color: #7f8897;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;  /* 超长标题自动截断 */
}
.breadcrumb li:last-child::after { content: ""; }

/* --- 详情页响应式双栏布局 --- */
.detail-layout { display: flex; flex-direction: column; padding: 10px 0 60px 0; }

/* 文章主体纯白卡片 */
.article-area {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(160, 175, 195, 0.06);
}

.article-header { margin-bottom: 20px; border-bottom: 1px solid var(--border-color); padding-bottom: 15px; }
.article-meta { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 10px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.type-badge { color: var(--accent-orange); font-weight: bold; background: rgba(255, 106, 0, 0.08); padding: 1px 6px; border-radius: 4px; }
.article-title { font-size: 1.35rem; line-height: 1.4; color: #0f172a; font-weight: 700; }

.article-body h2 { font-size: 1.15rem; color: #0f172a; margin: 25px 0 12px 0; padding-bottom: 6px; border-bottom: 2px solid var(--border-color); }
.article-body p { margin-bottom: 16px; color: #333a48; font-size: 0.95rem; text-align: justify; }
.article-body code { background: #f0f2f5; color: #d63384; padding: 2px 6px; border-radius: 4px; font-size: 0.85rem; }

.code-block-wrapper {
    background-color: var(--code-bg); border: 1px solid var(--border-color); border-radius: 6px; padding: 12px; margin: 18px 0;
    overflow-x: auto; width: 100%; max-width: 100%; display: block; -webkit-overflow-scrolling: touch;
}
.code-block-wrapper pre { font-family: monospace; font-size: 0.82rem; white-space: pre; }

/* 翻页组件 */
.post-pagination {
    margin-top: 35px; padding-top: 20px; border-top: 1px dashed var(--border-color);
    display: flex; flex-direction: column; gap: 12px;
}
.page-link-btn {
    display: flex; flex-direction: column; padding: 12px 16px; background-color: #f8fafe;
    border: 1px solid var(--border-color); border-radius: 6px; text-decoration: none; transition: all 0.2s;
}
.page-link-btn:hover { border-color: var(--primary-geo); background-color: #ffffff; box-shadow: 0 4px 12px rgba(0, 100, 255, 0.05); }
.page-link-btn span { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 4px; }
.page-link-btn strong { font-size: 0.9rem; color: var(--text-main); font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.page-link-btn:hover strong { color: var(--primary-geo); }

/* 相关文章列表 */
.related-section { margin-top: 35px; }
.related-title { font-size: 1.1rem; color: #0f172a; margin-bottom: 16px; display: flex; align-items: center; gap: 6px; }
.related-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.related-item { background-color: #ffffff; border: 1px solid var(--border-color); border-radius: 6px; padding: 14px 16px; transition: all 0.2s; }
.related-item:hover { border-color: var(--primary-geo); transform: translateX(2px); }
.related-item a { text-decoration: none; color: #0f172a; font-size: 0.95rem; font-weight: 600; display: block; margin-bottom: 4px; }
.related-item:hover a { color: var(--primary-hover); }
.related-desc { font-size: 0.85rem; color: var(--text-muted); display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }

/* 移动端隐藏侧边栏目录 */
.toc-sidebar { display: none; }

footer { text-align: center; padding: 30px 0; color: var(--text-muted); font-size: 0.75rem; border-top: 1px solid var(--border-color); background: #ffffff; margin-top: 40px; }

/* ==================== 💻 电脑端媒体查询 (屏幕宽度 >= 1000px) ==================== */
@media (min-width: 1000px) {
    .container { padding: 0 20px; }
    .nav-box { height: 70px; }
    .logo { font-size: 1.4rem; gap: 8px; }
    .nav-links { gap: 25px; }
    .nav-links a { font-size: 0.95rem; }

    .breadcrumb-wrapper { padding: 16px 0 8px 0; }
    .breadcrumb { font-size: 0.88rem; }
    .breadcrumb li:last-child { max-width: 400px; }

    /* 大屏双栏 */
    .detail-layout { display: grid; grid-template-columns: 3.2fr 1fr; gap: 30px; padding: 20px 0 80px 0; }
    .article-area { padding: 35px; }
    .article-title { font-size: 2.0rem; }
    .article-body h2 { font-size: 1.5rem; }
    
    /* PC翻页组件并排 */
    .post-pagination { flex-direction: row; justify-content: space-between; gap: 20px; }
    .page-link-btn { width: 48%; padding: 16px; }
    .page-link-btn.next-post { text-align: right; align-items: flex-end; }

    /* PC相关文章双列 */
    .related-list { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    
    /* 侧边栏固定 */
    .toc-sidebar { display: block; position: sticky; top: 100px; height: fit-content; }
    .toc-box { background-color: var(--card-bg); border: 1px solid var(--border-color); border-radius: 8px; padding: 20px; box-shadow: 0 4px 12px rgba(160, 175, 195, 0.06); }
    .toc-box h4 { font-size: 0.95rem; margin-bottom: 15px; color: #0f172a; border-bottom: 2px solid var(--border-color); padding-bottom: 8px; font-weight: 700;}
    .toc-links { list-style: none; display: flex; flex-direction: column; gap: 12px; font-size: 0.9rem; }
    .toc-links a { color: var(--text-muted); text-decoration: none; transition: color 0.2s; }
    .toc-links a:hover { color: var(--primary-geo); padding-left: 2px; }
}