/* ============================================================
   Knowledge Base Styles
   Sidebar + article layout with documentation vibes
   ============================================================ */

.kb-body {
    padding-top: var(--nav-height);
}

/* --- KB Layout --- */
.kb-layout {
    display: flex;
    min-height: calc(100vh - var(--nav-height));
}

/* --- Sidebar --- */
.kb-sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--bg-1);
    border-right: 1px solid var(--bg-3);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: var(--nav-height);
    height: calc(100vh - var(--nav-height));
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--bg-4) transparent;
    transition: transform var(--duration) var(--ease);
    z-index: 50;
}
.kb-sidebar::-webkit-scrollbar { width: 5px; }
.kb-sidebar::-webkit-scrollbar-track { background: transparent; }
.kb-sidebar::-webkit-scrollbar-thumb { background: var(--bg-4); border-radius: 3px; }

.kb-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 20px 0;
}
.kb-sidebar-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-2);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}
.kb-sidebar-close {
    display: none;
    background: none;
    border: none;
    color: var(--text-2);
    font-size: 1.4rem;
    cursor: pointer;
    padding: 0 4px;
}

/* Search */
.kb-search {
    padding: 16px 20px;
    position: relative;
}
.kb-search input {
    width: 100%;
    background: var(--bg-2);
    border: 1px solid var(--bg-3);
    color: var(--text-1);
    font-family: inherit;
    font-size: 0.85rem;
    padding: 10px 12px 10px 36px;
    border-radius: var(--radius);
    outline: none;
    transition: border-color var(--duration) var(--ease);
}
.kb-search input::placeholder { color: var(--text-3); }
.kb-search input:focus { border-color: var(--accent-dim); }
.kb-search-icon {
    position: absolute;
    left: 32px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.8rem;
    pointer-events: none;
}

/* Nav tree */
.kb-nav {
    flex: 1;
    padding: 0 12px 20px;
}
.kb-nav-section {
    margin-bottom: 8px;
}
.kb-nav-section-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-2);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    border-radius: 6px;
    transition: background var(--duration) var(--ease);
    user-select: none;
}
.kb-nav-section-header:hover {
    background: var(--bg-2);
}
.kb-nav-section-icon {
    font-size: 0.9rem;
}
.kb-nav-section-arrow {
    margin-left: auto;
    font-size: 0.65rem;
    color: var(--text-3);
    transition: transform var(--duration) var(--ease);
}
.kb-nav-section.open .kb-nav-section-arrow {
    transform: rotate(90deg);
}
.kb-nav-items {
    list-style: none;
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.3s var(--ease);
}
.kb-nav-section.open .kb-nav-items {
    max-height: 500px;
}
.kb-nav-item {
    margin: 0;
}
.kb-nav-item a {
    display: block;
    padding: 7px 8px 7px 32px;
    font-size: 0.85rem;
    color: var(--text-2);
    border-radius: 6px;
    transition: all var(--duration) var(--ease);
    border-left: 2px solid transparent;
    margin-left: 4px;
}
.kb-nav-item a:hover {
    color: var(--text-0);
    background: var(--bg-2);
}
.kb-nav-item a.active {
    color: var(--accent);
    background: var(--accent-glow);
    border-left-color: var(--accent);
}
.kb-nav-item-meta {
    display: block;
    font-size: 0.7rem;
    color: var(--text-3);
    margin-top: 1px;
}

/* Sidebar footer */
.kb-sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--bg-3);
    margin-top: auto;
}
.kb-sidebar-footer a {
    font-size: 0.8rem;
    color: var(--text-3);
}
.kb-sidebar-footer a:hover { color: var(--accent); }

/* Sidebar toggle (mobile) */
.kb-sidebar-toggle {
    display: none;
    position: fixed;
    bottom: 20px;
    left: 20px;
    width: 48px;
    height: 48px;
    background: var(--accent);
    color: var(--bg-0);
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    z-index: 60;
    box-shadow: 0 4px 20px rgba(108, 159, 255, 0.4);
    transition: transform var(--duration) var(--ease);
}
.kb-sidebar-toggle:hover { transform: scale(1.1); }

/* --- Main content --- */
.kb-main {
    flex: 1;
    min-width: 0;
    padding: 40px 48px;
    max-width: 860px;
}

/* KB Home */
.kb-home-header {
    margin-bottom: 40px;
}
.kb-home-header h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-0);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}
.kb-home-header p {
    color: var(--text-2);
    font-size: 1.05rem;
}

/* Article cards on KB home */
.kb-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}
.kb-card {
    background: var(--bg-1);
    border: 1px solid var(--bg-3);
    border-radius: var(--radius-lg);
    padding: 24px;
    cursor: pointer;
    transition: all var(--duration) var(--ease);
    text-decoration: none;
    color: inherit;
}
.kb-card:hover {
    border-color: var(--bg-4);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    color: inherit;
}
.kb-card-section {
    font-size: 0.7rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
}
.kb-card-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-0);
    margin-bottom: 6px;
}
.kb-card-desc {
    font-size: 0.85rem;
    color: var(--text-2);
    line-height: 1.5;
    margin-bottom: 12px;
}
.kb-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.kb-card-date {
    font-size: 0.75rem;
    color: var(--text-3);
}
.kb-card-tags {
    display: flex;
    gap: 4px;
}
.kb-card-tags span {
    font-size: 0.65rem;
    background: var(--bg-3);
    color: var(--text-2);
    padding: 2px 8px;
    border-radius: 3px;
}

/* No results */
.kb-no-results {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-3);
}
.kb-no-results-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

/* --- Article View --- */
.kb-article-breadcrumb {
    font-size: 0.8rem;
    color: var(--text-3);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.kb-article-breadcrumb a { color: var(--text-2); }
.kb-article-breadcrumb a:hover { color: var(--accent); }
.kb-article-breadcrumb .sep { color: var(--text-3); }

/* Article content (markdown-like) */
.kb-article {
    line-height: 1.8;
}
.kb-article h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-0);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}
.kb-article .article-meta {
    font-size: 0.85rem;
    color: var(--text-3);
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--bg-3);
}
.kb-article .article-meta .tag {
    display: inline-block;
    background: var(--accent-glow);
    color: var(--accent);
    padding: 2px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    margin-left: 4px;
}
.kb-article h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-0);
    margin-top: 48px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--bg-3);
}
.kb-article h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-0);
    margin-top: 32px;
    margin-bottom: 12px;
}
.kb-article p {
    margin-bottom: 16px;
    color: var(--text-1);
}
.kb-article ul, .kb-article ol {
    margin-bottom: 16px;
    padding-left: 24px;
}
.kb-article li {
    margin-bottom: 6px;
    color: var(--text-1);
}
.kb-article code {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.85em;
    background: var(--bg-2);
    border: 1px solid var(--bg-3);
    padding: 2px 7px;
    border-radius: 4px;
    color: var(--accent);
}
.kb-article pre {
    background: var(--bg-1);
    border: 1px solid var(--bg-3);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 20px;
    overflow-x: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--bg-4) transparent;
}
.kb-article pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.85rem;
    color: var(--text-1);
    line-height: 1.6;
}
.kb-article blockquote {
    border-left: 3px solid var(--accent);
    padding: 12px 20px;
    margin: 0 0 16px 0;
    background: var(--accent-glow);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--text-1);
}
.kb-article table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
    font-size: 0.9rem;
}
.kb-article th {
    background: var(--bg-2);
    color: var(--text-0);
    font-weight: 600;
    text-align: left;
    padding: 10px 14px;
    border-bottom: 2px solid var(--bg-3);
}
.kb-article td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--bg-3);
    color: var(--text-1);
}
.kb-article tr:hover td {
    background: var(--bg-2);
}
.kb-article img {
    border-radius: var(--radius);
    border: 1px solid var(--bg-3);
    margin: 16px 0;
}

/* Info/warning/tip boxes */
.kb-callout {
    padding: 16px 20px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    border-left: 3px solid;
    font-size: 0.9rem;
}
.kb-callout-info {
    background: rgba(108, 159, 255, 0.08);
    border-color: var(--accent);
    color: var(--text-1);
}
.kb-callout-warning {
    background: rgba(240, 208, 96, 0.08);
    border-color: var(--yellow);
    color: var(--text-1);
}
.kb-callout-tip {
    background: rgba(92, 224, 160, 0.08);
    border-color: var(--green);
    color: var(--text-1);
}
.kb-callout-title {
    font-weight: 600;
    color: var(--text-0);
    margin-bottom: 4px;
}

/* --- Responsive --- */

/* Overlay behind sidebar on mobile */
.kb-sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 75;
}
.kb-sidebar-overlay.active { display: block; }

@media (max-width: 900px) {
    .kb-sidebar {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        bottom: 0;
        transform: translateX(-100%);
        z-index: 80;
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.4);
        width: 85vw;
        max-width: 320px;
    }
    .kb-sidebar.open {
        transform: translateX(0);
    }
    .kb-sidebar-close {
        display: block;
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .kb-sidebar-toggle { display: block; }
    .kb-main {
        padding: 24px 20px;
    }
    /* Bigger touch targets for sidebar nav */
    .kb-nav-section-header { padding: 12px 8px; min-height: 44px; }
    .kb-nav-item a { padding: 10px 8px 10px 32px; min-height: 44px; }
    .kb-search input { padding: 12px 12px 12px 36px; font-size: 16px; /* prevents iOS zoom */ }
}

@media (max-width: 600px) {
    .kb-cards { grid-template-columns: 1fr; }
    .kb-card { padding: 18px; }

    .kb-article h1 { font-size: 1.5rem; }
    .kb-article h2 { font-size: 1.15rem; margin-top: 36px; }
    .kb-article h3 { font-size: 1rem; }
    .kb-article p { font-size: 0.95rem; }
    .kb-article li { font-size: 0.95rem; }

    /* Tables scroll horizontally instead of breaking layout */
    .kb-article table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        font-size: 0.8rem;
    }

    /* Code blocks don't overflow */
    .kb-article pre {
        padding: 14px;
        font-size: 0.78rem;
    }
    .kb-article pre code { font-size: 0.78rem; }

    /* Callouts tighter on mobile */
    .kb-callout { padding: 12px 14px; font-size: 0.85rem; }

    /* Breadcrumb wraps */
    .kb-article-breadcrumb { flex-wrap: wrap; font-size: 0.75rem; }

    .kb-home-header h1 { font-size: 1.5rem; }
    .kb-home-header p { font-size: 0.95rem; }
}

@media (max-width: 380px) {
    .kb-main { padding: 16px 12px; }
    .kb-article pre { padding: 10px; }
}