/* ==========================================================================
   Sidebar — site identity, navigation, the category tree, sidebar lists.
   Becomes an off-canvas drawer at ≤1024px.
   ========================================================================== */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    display: flex;
    flex-direction: column;
    width: var(--sidebar-width);
    height: 100vh;
    height: 100dvh;
    overflow-y: auto;
    overscroll-behavior: contain;
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    scrollbar-width: thin;
    scrollbar-color: var(--color-border-strong) transparent;
}

/* Header: logo + theme toggle (+ close button in drawer mode) */
.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-md);
}

.sidebar-logo { display: flex; align-items: center; min-width: 0; }
.sidebar-logo img { max-height: 28px; width: auto; }
.sidebar-logo .site-title {
    font-family: var(--font-heading);
    font-size: 1.0625rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-header-actions { display: flex; gap: var(--spacing-xs); }

.desktop-toggle,
.sidebar-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: background var(--transition-fast), color var(--transition-fast);
}
.desktop-toggle:hover,
.sidebar-close:hover { background: var(--color-bg-tertiary); color: var(--color-text); }
.sidebar-close { display: none; }

/* Theme toggle icons */
.dark-mode-toggle .sun-icon { display: none; }
.dark-mode-toggle .moon-icon { display: block; }
[data-theme="dark"] .dark-mode-toggle .sun-icon { display: block; }
[data-theme="dark"] .dark-mode-toggle .moon-icon { display: none; }

/* Search trigger */
.sidebar-search {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin: 0 var(--spacing-lg) var(--spacing-md);
    padding: 7px var(--spacing-sm) 7px 10px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-align: left;
    transition: border-color var(--transition-fast);
}
.sidebar-search:hover { border-color: var(--color-border-strong); color: var(--color-text-secondary); }
.sidebar-search span { flex: 1; }
.sidebar-search kbd { background: var(--color-bg-secondary); }

/* Primary navigation (Ghost navigation setting) */
.sidebar-nav { padding: 0 var(--spacing-md) var(--spacing-sm); }
.sidebar-nav ul { list-style: none; }
.sidebar-nav a {
    display: flex;
    align-items: center;
    padding: 6px var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    transition: background var(--transition-fast), color var(--transition-fast);
}
.sidebar-nav a:hover { background: var(--color-bg-tertiary); }
.sidebar-nav .nav-current a { color: var(--color-accent); }

/* Section title */
.sidebar-section-title {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
    padding: 0 var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

/* ==========================================================================
   Category tree — a directory listing. Server renders a flat list of links;
   tag-tree.js groups them into categories with a colour swatch each.
   ========================================================================== */

.sidebar-tags {
    flex: none;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
    border-top: 1px solid var(--color-border);
}

.tag-tree { list-style: none; }
.tag-item { margin: 0; }

/* Shared row styling for category toggles and leaf links */
.tag-toggle,
.tag-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    min-height: 32px;
    padding: 4px var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    color: var(--color-text);
    text-align: left;
    transition: background var(--transition-fast), color var(--transition-fast);
}
.tag-toggle:hover,
.tag-link:hover { background: var(--color-bg-tertiary); color: var(--color-text); }

.tag-toggle { font-weight: 500; }
.tag-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tag-count {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--color-text-muted);
    font-variant-numeric: tabular-nums;
}

.folder-icon {
    display: inline-flex;
    width: 14px;
    color: var(--color-text-muted);
    transition: transform var(--transition-fast);
}
.tag-toggle[aria-expanded="true"] .folder-icon { transform: rotate(90deg); }

/* Children: indented under a guide line, like a tree view */
.tag-children {
    list-style: none;
    margin: 2px 0 4px 17px;
    padding-left: 12px;
    border-left: 1px solid var(--color-border-strong);
    overflow: hidden;
    max-height: 0;
    transition: max-height var(--transition-slow);
}
.tag-toggle[aria-expanded="true"] + .tag-children { max-height: 1200px; }
.tag-child .tag-link { min-height: 28px; font-size: 0.875rem; color: var(--color-text-secondary); }
.tag-child .tag-link:hover { color: var(--color-text); }

/* Current tag page */
.tag-link[aria-current="page"] {
    color: var(--cat-color, var(--color-accent));
    background: color-mix(in srgb, var(--cat-color, var(--color-accent)) 10%, transparent);
    font-weight: 600;
}
.tag-child .tag-link[aria-current="page"] { color: var(--cat-color, var(--color-accent)); }

/* Before JS runs, the flat list is still usable: tone it down slightly */
.tag-tree:not(.is-enhanced) .tag-link { font-size: 0.875rem; }

/* ==========================================================================
   Sidebar post lists (featured / latest)
   ========================================================================== */

.sidebar-posts {
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
    border-top: 1px solid var(--color-border);
}
.featured-list { list-style: none; }
.featured-item { margin: 0; }
.featured-link {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: 6px var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}
.featured-link:hover { background: var(--color-bg-tertiary); }
.featured-image,
.featured-placeholder {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
    object-fit: cover;
    background: var(--color-bg-tertiary);
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
}
.featured-title {
    font-size: 0.85rem;
    line-height: 1.45;
    color: var(--color-text);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.latest-posts .featured-link { padding-left: var(--spacing-sm); }
.latest-posts .featured-title { color: var(--color-text-secondary); }
.latest-posts .featured-link:hover .featured-title { color: var(--color-text); }

/* ==========================================================================
   Newsletter
   ========================================================================== */

.newsletter-box {
    margin: var(--spacing-md) var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}
.newsletter-title { font-size: 0.9rem; font-weight: 600; }
.newsletter-description { font-size: 0.8rem; color: var(--color-text-secondary); margin: 2px 0 var(--spacing-sm); }
.newsletter-form { display: flex; flex-direction: column; gap: var(--spacing-sm); }
.newsletter-input {
    width: 100%;
    padding: 7px 10px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}
.newsletter-input:focus { border-color: var(--color-accent); }
.newsletter-button {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 7px 10px;
    background: var(--color-accent);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: #fff;
    transition: background var(--transition-fast);
}
.newsletter-button:hover { background: var(--color-accent-hover); }
.newsletter-button-loading { display: none; }
.newsletter-form.loading .newsletter-button-text { display: none; }
.newsletter-form.loading .newsletter-button-loading { display: block; }
.newsletter-message { font-size: 0.8rem; color: #d64545; }
.newsletter-success { display: none; font-size: 0.8rem; color: #1f9d63; }
.newsletter-form.success .newsletter-success { display: block; }

/* ==========================================================================
   Sidebar footer
   ========================================================================== */

.sidebar-footer {
    margin-top: auto;
    padding: var(--spacing-md) var(--spacing-lg) var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}
.social-links { display: flex; gap: 2px; margin-bottom: var(--spacing-sm); }
.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    transition: background var(--transition-fast), color var(--transition-fast);
}
.social-link svg { width: 17px; height: 17px; }
.social-link:hover { background: var(--color-bg-tertiary); color: var(--color-text); }
.sidebar-copyright {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--color-text-muted);
}

/* ==========================================================================
   Drawer mode
   ========================================================================== */

.sidebar-overlay {
    position: fixed;
    inset: 0;
    z-index: 99;
    background: rgba(10, 13, 18, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: none;
        transition: transform var(--transition-slow), box-shadow var(--transition-slow);
    }
    .sidebar.open { transform: translateX(0); box-shadow: var(--shadow-lg); }
    .sidebar.open ~ .sidebar-overlay,
    body.sidebar-open .sidebar-overlay { opacity: 1; visibility: visible; }
    .sidebar-close { display: flex; }
    .desktop-toggle { display: none; }
    body.sidebar-open { overflow: hidden; }
}

/* Recommendations (Ghost Settings → Recommendations) */
.sidebar-recommendations { padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm); border-top: 1px solid var(--color-border); }
.recommendations { list-style: none; }
.recommendation-link { display: flex; align-items: center; gap: var(--spacing-sm); padding: 6px var(--spacing-sm); border-radius: var(--radius-md); transition: background var(--transition-fast); }
.recommendation-link:hover { background: var(--color-bg-tertiary); }
.recommendation-favicon { width: 22px; height: 22px; flex-shrink: 0; border-radius: var(--radius-sm); background: var(--color-bg-tertiary); overflow: hidden; }
.recommendation-favicon img { width: 100%; height: 100%; object-fit: cover; }
.recommendation-body { display: flex; flex-direction: column; min-width: 0; }
.recommendation-title { font-size: 0.85rem; color: var(--color-text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.recommendation-url { font-size: 0.68rem; }

/* Member links */
.sidebar-account { display: flex; flex-wrap: wrap; gap: var(--spacing-sm) var(--spacing-md); padding: var(--spacing-sm) var(--spacing-lg) var(--spacing-md); }
.sidebar-account a { color: var(--color-text-secondary); }
.sidebar-account a:hover { color: var(--color-text); }
.sidebar-account-name { color: var(--color-text-muted); }