/* ===== KBot 知识库样式 ===== */
:root {
    --bg: #f8f9fa;
    --bg-card: #ffffff;
    --text: #1a1a2e;
    --text-light: #6c757d;
    --primary: #4a6fa5;
    --primary-light: #6b8fc9;
    --accent: #e8aa42;
    --border: #e9ecef;
    --tag-bg: #eef2f7;
    --hover-bg: #f0f4ff;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-hover: 0 4px 16px rgba(0,0,0,0.12);
    --max-width: 1200px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-light); text-decoration: underline; }

/* ===== Header ===== */
.site-header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    gap: 20px;
    height: 60px;
}

.logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text);
    white-space: nowrap;
}
.logo:hover { text-decoration: none; color: var(--primary); }

.nav-search { flex: 1; max-width: 400px; }
.nav-search .search-form { display: flex; gap: 0; }
.nav-search .search-input {
    flex: 1;
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: 8px 0 0 8px;
    font-size: 0.9rem;
    outline: none;
    background: var(--bg);
}
.nav-search .search-input:focus { border-color: var(--primary); }
.nav-search .search-btn {
    padding: 8px 16px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 0 8px 8px 0;
    cursor: pointer;
    font-size: 0.9rem;
}
.nav-search .search-btn:hover { background: var(--primary-light); }

.nav-links { display: flex; gap: 16px; }
.nav-links a { color: var(--text-light); font-size: 0.9rem; font-weight: 500; }

/* ===== Hero ===== */
.hero {
    text-align: center;
    padding: 60px 20px 40px;
    max-width: var(--max-width);
    margin: 0 auto;
}
.hero h1 { font-size: 2.5rem; font-weight: 800; margin-bottom: 8px; }
.hero-subtitle { color: var(--text-light); font-size: 1.1rem; margin-bottom: 30px; }

.hero-search {
    display: flex;
    max-width: 600px;
    margin: 0 auto 24px;
    gap: 0;
}
.hero-search-input {
    flex: 1;
    padding: 14px 20px;
    border: 2px solid var(--border);
    border-radius: 12px 0 0 12px;
    font-size: 1.1rem;
    outline: none;
    transition: border-color 0.2s;
}
.hero-search-input:focus { border-color: var(--primary); }
.hero-search-btn {
    padding: 14px 28px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 0 12px 12px 0;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.2s;
}
.hero-search-btn:hover { background: var(--primary-light); }

.stats-bar {
    display: flex;
    justify-content: center;
    gap: 24px;
    color: var(--text-light);
    font-size: 0.9rem;
}
.stats-bar span { background: var(--tag-bg); padding: 4px 16px; border-radius: 20px; }

/* ===== Home Layout ===== */
.home-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px 40px;
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 30px;
}

/* ===== Sidebar ===== */
.sidebar { position: sticky; top: 80px; align-self: start; }
.sidebar-section { margin-bottom: 24px; }
.sidebar-section h3 { font-size: 0.95rem; color: var(--text-light); margin-bottom: 10px; }

.category-list { list-style: none; }
.category-list li { margin-bottom: 4px; }
.category-list a {
    display: flex;
    justify-content: space-between;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: background 0.15s;
}
.category-list a:hover { background: var(--hover-bg); text-decoration: none; }
.category-list .count {
    background: var(--tag-bg);
    padding: 1px 8px;
    border-radius: 10px;
    font-size: 0.8rem;
    color: var(--text-light);
}

.tag-cloud { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
    display: inline-block;
    padding: 3px 10px;
    background: var(--tag-bg);
    border-radius: 15px;
    color: var(--text-light);
    font-size: 0.85rem;
    transition: all 0.15s;
}
.tag:hover {
    background: var(--primary);
    color: #fff;
    text-decoration: none;
}

/* ===== Page List ===== */
.page-list h2 { font-size: 1.3rem; margin-bottom: 16px; }

.card-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.kb-card {
    background: var(--bg-card);
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s, transform 0.15s;
    border: 1px solid transparent;
}
.kb-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-1px);
    border-color: var(--primary-light);
}

.card-meta {
    display: flex;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-light);
    margin-bottom: 6px;
}
.card-category {
    background: var(--primary);
    color: #fff;
    padding: 1px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
}

.kb-card h3 { font-size: 1.1rem; margin-bottom: 6px; }
.kb-card h3 a { color: var(--text); }
.kb-card h3 a:hover { color: var(--primary); text-decoration: none; }

.card-summary { color: var(--text-light); font-size: 0.9rem; line-height: 1.5; margin-bottom: 8px; }

.card-tags { display: flex; flex-wrap: wrap; gap: 4px; }
.tag-sm {
    display: inline-block;
    padding: 2px 8px;
    background: var(--tag-bg);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--text-light);
}
.tag-sm:hover { background: var(--primary); color: #fff; text-decoration: none; }

/* ===== Single Page ===== */
.kb-page {
    max-width: 800px;
    margin: 0 auto;
    padding: 30px 20px 60px;
}

.breadcrumb { 
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 20px;
}
.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--primary); }

.page-header { margin-bottom: 30px; }
.page-header h1 { font-size: 2rem; font-weight: 800; line-height: 1.3; margin-bottom: 10px; }

.page-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    color: var(--text-light);
    font-size: 0.85rem;
    margin-bottom: 10px;
}
.page-meta a { color: var(--text-light); }
.page-meta a:hover { color: var(--primary); }

.page-tags { margin-bottom: 12px; display: flex; flex-wrap: wrap; gap: 6px; }

.page-summary {
    border-left: 3px solid var(--primary);
    padding: 10px 16px;
    background: var(--tag-bg);
    border-radius: 0 8px 8px 0;
    color: var(--text-light);
    font-size: 0.95rem;
    margin: 12px 0;
}

/* ===== Markdown Body ===== */
.markdown-body {
    font-size: 1rem;
    line-height: 1.8;
}
.markdown-body h1 { font-size: 1.6rem; margin: 24px 0 12px; }
.markdown-body h2 { font-size: 1.35rem; margin: 20px 0 10px; }
.markdown-body h3 { font-size: 1.15rem; margin: 16px 0 8px; }
.markdown-body p { margin-bottom: 12px; }
.markdown-body ul, .markdown-body ol { margin: 8px 0; padding-left: 24px; }
.markdown-body li { margin-bottom: 4px; }
.markdown-body blockquote {
    border-left: 3px solid var(--primary-light);
    padding: 8px 16px;
    margin: 12px 0;
    color: var(--text-light);
    background: var(--tag-bg);
    border-radius: 0 8px 8px 0;
}
.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 0.9rem;
}
.markdown-body th, .markdown-body td {
    border: 1px solid var(--border);
    padding: 8px 12px;
    text-align: left;
}
.markdown-body th { background: var(--tag-bg); font-weight: 600; }
.markdown-body tr:nth-child(even) { background: var(--bg); }
.markdown-body code {
    background: var(--tag-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85em;
    font-family: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
}
.markdown-body pre { margin: 16px 0; border-radius: 8px; overflow-x: auto; }
.markdown-body pre code { background: transparent; padding: 0; border-radius: 0; }
.markdown-body img { max-width: 100%; border-radius: 8px; margin: 16px 0; }
.markdown-body hr { border: none; border-top: 1px solid var(--border); margin: 24px 0; }

/* FTS5 highlight */
mark { background: #fff3bf; padding: 1px 3px; border-radius: 2px; }

/* ===== Related Pages ===== */
.page-related {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}
.page-related h3 { margin-bottom: 10px; }
.page-related ul { list-style: none; padding: 0; }
.page-related li { margin-bottom: 4px; }
.page-related li::before { content: "📎 "; }

/* ===== Search ===== */
.search-page {
    max-width: 800px;
    margin: 0 auto;
    padding: 30px 20px 60px;
}
.search-page h1 { margin-bottom: 20px; font-size: 1.5rem; }
.search-summary { margin: 16px 0; color: var(--text-light); font-size: 0.9rem; }

.search-results { display: flex; flex-direction: column; gap: 12px; }
.search-item {
    background: var(--bg-card);
    padding: 16px 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid transparent;
    transition: box-shadow 0.2s;
}
.search-item:hover { box-shadow: var(--shadow-hover); border-color: var(--primary-light); }
.search-meta { margin-bottom: 4px; }
.search-category {
    background: var(--primary);
    color: #fff;
    padding: 1px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
}
.search-item h3 { margin-bottom: 6px; }
.search-item h3 a { color: var(--text); }
.search-item h3 a:hover { color: var(--primary); }
.search-snippet { color: var(--text-light); font-size: 0.9rem; margin-bottom: 6px; line-height: 1.5; }
.search-tags { display: flex; flex-wrap: wrap; gap: 4px; }

/* ===== Tag/Category Pages ===== */
.tag-page, .category-page {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 30px 20px 60px;
}
.tag-page h1, .category-page h1 { margin-bottom: 6px; }
.tag-count { color: var(--text-light); font-size: 0.9rem; margin-bottom: 20px; }

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}
.empty-state p { margin-bottom: 8px; }

/* ===== 404 ===== */
.error-page { text-align: center; padding: 100px 20px; }
.error-page h1 { font-size: 4rem; margin-bottom: 16px; color: var(--primary-light); }
.error-page p { margin-bottom: 12px; }

.btn {
    display: inline-block;
    padding: 10px 24px;
    background: var(--primary);
    color: #fff;
    border-radius: 8px;
    font-weight: 500;
    transition: background 0.2s;
}
.btn:hover { background: var(--primary-light); text-decoration: none; color: #fff; }

/* ===== Footer ===== */
.site-footer {
    margin-top: auto;
    padding: 24px 20px;
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-light);
    font-size: 0.85rem;
}
.site-footer a { color: var(--text-light); }
.site-footer a:hover { color: var(--primary); }

/* ===== Mobile ===== */
@media (max-width: 768px) {
    .home-content { grid-template-columns: 1fr; }
    .sidebar {
        position: static;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }
    .hero h1 { font-size: 1.8rem; }
    .nav-container { gap: 10px; }
    .nav-search { max-width: 200px; }
    .nav-links { display: none; }
    .kb-page { padding: 20px 16px 40px; }
    .page-header h1 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
    .sidebar { grid-template-columns: 1fr; }
    .hero { padding: 40px 16px 30px; }
    .stats-bar { flex-direction: column; align-items: center; gap: 8px; }
    .nav-search { max-width: 140px; }
}