:root {
    --sidebar-width: 280px;
    --sidebar-bg: var(--bs-body-bg);
    --sidebar-border: var(--bs-border-color);
}

body {
    min-height: 100vh;
}

.navbar {
    background-color: var(--bs-body-bg);
}

.sidebar {
    position: sticky;
    top: 0;
    height: calc(100vh - 56px);
    overflow-y: auto;
    border-right: 1px solid var(--sidebar-border);
    padding: 1rem 0;
}

.sidebar-tree {
    padding: 0 0.75rem;
    font-size: 0.9rem;
}

.folder-toggle {
    cursor: pointer;
    font-weight: 600;
    padding: 0.2rem 0;
    user-select: none;
}

.folder-toggle::before {
    content: '▾ ';
    display: inline-block;
    transition: transform 0.15s;
}

.folder-toggle:not(.open)::before {
    content: '▸ ';
}

.file-list {
    list-style: none;
    padding-left: 1rem;
    margin: 0;
}

.file-list.collapsed {
    display: none;
}

.file-item a {
    color: var(--bs-body-color);
    text-decoration: none;
    padding: 0.15rem 0.5rem;
    display: block;
    border-radius: 0.25rem;
}

.file-item a:hover {
    background-color: var(--bs-tertiary-bg);
}

.file-item.active a {
    background-color: var(--bs-primary-bg-subtle);
    color: var(--bs-primary-text-emphasis);
}

.content {
    max-width: 900px;
}

.content img {
    max-width: 100%;
    height: auto;
    border-radius: 0.5rem;
    margin: 0.5rem 0;
}

.content table {
    width: 100%;
    margin-bottom: 1rem;
}

.content table th,
.content table td {
    padding: 0.5rem;
    border: 1px solid var(--bs-border-color);
}

.content table th {
    background-color: var(--bs-tertiary-bg);
}

.content blockquote {
    border-left: 4px solid var(--bs-primary);
    padding: 0.5rem 1rem;
    margin: 1rem 0;
    background-color: var(--bs-tertiary-bg);
    border-radius: 0 0.25rem 0.25rem 0;
}

.content pre {
    background-color: var(--bs-tertiary-bg);
    padding: 1rem;
    border-radius: 0.5rem;
    overflow-x: auto;
}

.content code {
    font-size: 0.875em;
}

.content h1, .content h2, .content h3, .content h4, .content h5, .content h6 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.content h1 { border-bottom: 1px solid var(--bs-border-color); padding-bottom: 0.3rem; }
.content h2 { border-bottom: 1px solid var(--bs-border-color); padding-bottom: 0.2rem; }

.content .task-list-item {
    list-style: none;
    margin-left: -1.5rem;
}

.content .task-list-item input[type="checkbox"] {
    margin-right: 0.5rem;
}

.broken-link {
    color: var(--bs-danger);
    text-decoration: line-through;
    cursor: help;
}

.ignored-link {
    background-color: rgba(var(--bs-warning-rgb), 0.2);
    border: 1px dashed var(--bs-warning);
    padding: 0.1rem 0.3rem;
    border-radius: 0.2rem;
    cursor: help;
    font-style: italic;
}

.embedded-note {
    border-left: 3px solid var(--bs-primary);
}

mark {
    background-color: rgba(var(--bs-warning-rgb), 0.3);
    padding: 0.1rem 0.2rem;
    border-radius: 0.15rem;
}

/* Tags */
.tag-pill {
    display: inline-block;
    background-color: rgba(var(--bs-primary-rgb), 0.15);
    color: var(--bs-primary);
    padding: 0.05rem 0.45rem;
    border-radius: 1rem;
    font-size: 0.8em;
    font-weight: 500;
    white-space: nowrap;
}

/* Block reference anchors */
a[id]:empty {
    position: relative;
}

/* Math / LaTeX */
.math {
    overflow-x: auto;
}

div.math {
    text-align: center;
    margin: 1rem 0;
}

/* Metadata aside */
.metadata-aside {
    border-left: 1px solid var(--bs-border-color);
}

/* Metadata panel */
.metadata-panel {
    position: sticky;
    top: 4rem;
    background-color: var(--bs-tertiary-bg);
    border: 1px solid var(--bs-border-color);
    border-radius: 0.5rem;
    font-size: 0.8rem;
}

.metadata-header {
    padding: 0.4rem 0.75rem;
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--bs-secondary-color);
    border-bottom: 1px solid var(--bs-border-color);
}

.metadata-table {
    width: 100%;
    margin: 0;
    border: none;
}

.metadata-table tr:not(:last-child) td {
    border-bottom: 1px solid var(--bs-border-color);
}

.metadata-table td {
    padding: 0.3rem 0.75rem;
    vertical-align: top;
    border: none;
}

.metadata-key {
    color: var(--bs-secondary-color);
    white-space: nowrap;
    width: 1%;
}

/* Mobile metadata collapsible */
.metadata-mobile {
    border: 1px solid var(--bs-border-color);
    border-radius: 0.5rem;
    padding: 0;
    background: var(--bs-tertiary-bg);
}

.metadata-mobile summary {
    padding: 0.5rem 0.75rem;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--bs-secondary-color);
    cursor: pointer;
    list-style: none;
}

.metadata-mobile summary::before {
    content: '▸ ';
}

.metadata-mobile[open] summary::before {
    content: '▾ ';
}

.metadata-mobile .metadata-panel {
    border: none;
    border-radius: 0;
    border-top: 1px solid var(--bs-border-color);
}

.metadata-mobile .metadata-header {
    display: none;
}

/* Search */
.search-container {
    max-width: 250px;
    flex: 1;
}

.search-results {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 1050;
    max-height: 400px;
    overflow-y: auto;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.3);
    border-radius: 0.375rem;
    margin-top: 0.25rem;
}

.search-results .list-group-item {
    font-size: 0.85rem;
    padding: 0.5rem 0.75rem;
}

/* Theme switcher */
#theme-switcher .btn.active {
    background-color: var(--bs-primary);
    border-color: var(--bs-primary);
    color: #fff;
}

/* Graph */
#graph-container {
    position: relative;
    width: 100%;
    height: calc(100vh - 120px);
}

#graph {
    width: 100%;
    height: 100%;
}

.graph-link {
    stroke: var(--bs-border-color);
    stroke-opacity: 0.4;
    stroke-width: 1.5;
}

.graph-node {
    cursor: pointer;
}

.graph-node circle {
    stroke: var(--bs-body-bg);
    stroke-width: 2;
}

.graph-label {
    font-size: 11px;
    fill: var(--bs-body-color);
    pointer-events: none;
}

.graph-tooltip {
    display: none;
    position: fixed;
    background: var(--bs-tertiary-bg);
    border: 1px solid var(--bs-border-color);
    padding: 0.3rem 0.6rem;
    border-radius: 0.25rem;
    font-size: 0.8rem;
    pointer-events: none;
    z-index: 1060;
}

/* Canvas */
.canvas-container {
    position: relative;
    overflow: auto;
    min-height: 400px;
    border: 1px solid var(--bs-border-color);
    border-radius: 0.5rem;
    background: var(--bs-tertiary-bg);
}

.canvas-node {
    position: absolute;
    border: 1px solid var(--bs-border-color);
    border-radius: 0.5rem;
    background: var(--bs-body-bg);
    padding: 0.75rem;
    overflow: auto;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    z-index: 1;
}

.canvas-node .card-content { font-size: 0.85rem; }
.canvas-node-file { background: var(--bs-primary-bg-subtle); }
.canvas-node-link { background: var(--bs-info-bg-subtle); }
.canvas-node-group {
    border: 2px dashed var(--bs-border-color);
    background: transparent;
    z-index: 0;
}

.canvas-group-label {
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--bs-secondary-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.canvas-color-red { border-color: var(--bs-danger); border-width: 2px; }
.canvas-color-orange { border-color: var(--bs-warning); border-width: 2px; }
.canvas-color-yellow { border-color: #ffc107; border-width: 2px; }
.canvas-color-green { border-color: var(--bs-success); border-width: 2px; }
.canvas-color-cyan { border-color: var(--bs-info); border-width: 2px; }
.canvas-color-purple { border-color: #6f42c1; border-width: 2px; }

.canvas-edges { z-index: 0; }
.canvas-edge-label {
    font-size: 0.75rem;
    fill: var(--bs-secondary-color);
}

/* Excalidraw */
.excalidraw-embed {
    text-align: center;
    margin: 1rem 0;
}

.excalidraw-image {
    max-width: 100%;
    border-radius: 0.5rem;
}

.excalidraw-placeholder {
    border: 2px dashed var(--bs-border-color);
    border-radius: 0.5rem;
    padding: 2rem;
    text-align: center;
    color: var(--bs-secondary-color);
    background: var(--bs-tertiary-bg);
}

.excalidraw-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.excalidraw-text-preview {
    text-align: left;
    max-width: 400px;
    margin: 1rem auto;
    font-size: 0.85rem;
}

@media (max-width: 991.98px) {
    .sidebar {
        position: fixed;
        z-index: 1045;
        height: 100vh;
        width: var(--sidebar-width);
    }

    .search-container {
        max-width: 150px;
    }
}