:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --bg-light: #f8fafc;
    --border-color: #e2e8f0;
    --text-dark: #1e293b;
    --text-muted: #64748b;
}

body {
    background-color: var(--bg-light);
    color: var(--text-dark);
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.15rem;
}

.bg-primary:not(.bg-opacity-10):not(.bg-opacity-25):not(.bg-opacity-50):not(.bg-opacity-75) {
    background-color: var(--primary) !important;
}

.card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    transition: box-shadow 0.2s;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.stat-card {
    padding: 1.5rem;
}

.stat-card .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
}

.stat-card .stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1;
}

.stat-card .stat-label {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 4px;
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
}

.login-card {
    width: 100%;
    max-width: 420px;
    padding: 2.5rem;
    border-radius: 16px;
    background: white;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.login-card h2 {
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.login-card .subtitle {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.table th {
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border-color);
}

.table td {
    vertical-align: middle;
}

.badge {
    font-weight: 500;
    padding: 0.4em 0.8em;
    border-radius: 6px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-top: 1.5rem;
}

.page-header h3 {
    font-weight: 700;
    margin: 0;
}

.btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
    border-radius: 8px;
    padding: 0.5rem 1.25rem;
    font-weight: 500;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
}

.btn-outline-primary {
    color: var(--primary);
    border-color: var(--primary);
    border-radius: 8px;
}

.btn-outline-primary:hover {
    background-color: var(--primary);
    border-color: var(--primary);
}

.form-control, .form-select {
    border-radius: 8px;
    border: 1px solid var(--border-color);
    padding: 0.6rem 0.9rem;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.content-wrapper {
    padding: 0 1.5rem 2rem;
}

.search-box {
    position: relative;
}

.search-box .bi-search {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-box input {
    padding-left: 36px;
}

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.pagination .page-link {
    border-radius: 8px;
    margin: 0 2px;
    color: var(--primary);
}

.pagination .page-item.active .page-link {
    background-color: var(--primary);
    border-color: var(--primary);
}

.file-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.file-icon.pdf { background: #fee2e2; color: #dc2626; }
.file-icon.doc { background: #dbeafe; color: #2563eb; }
.file-icon.xls { background: #dcfce7; color: #16a34a; }
.file-icon.img { background: #fef3c7; color: #d97706; }
.file-icon.default { background: #f1f5f9; color: #64748b; }

.document-content {
    line-height: 1.8;
    word-break: break-word;
}

.document-content img {
    max-width: 100%;
    height: auto;
}

.document-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

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

.category-tree {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-tree ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-tree > .tree-item:last-child > .tree-node {
    border-bottom: none;
}

.tree-children {
    margin-left: 0;
}

.tree-node {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    transition: background-color 0.15s;
    gap: 6px;
    border-bottom: 1px solid var(--border-color);
}

.tree-node.level-1 { padding-left: 12px; }
.tree-node.level-2 { padding-left: 42px; }
.tree-node.level-3 { padding-left: 72px; }
.tree-node.level-4 { padding-left: 102px; }
.tree-node.level-5 { padding-left: 132px; }

.tree-node:hover {
    background-color: #f1f5f9;
}

.tree-toggle {
    cursor: pointer;
    width: 20px;
    height: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border-radius: 4px;
    transition: background-color 0.15s;
}

.tree-toggle.has-children:hover {
    background-color: #e2e8f0;
}

.tree-toggle .toggle-spacer {
    width: 16px;
    display: inline-block;
}

.tree-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
    width: 22px;
    text-align: center;
}

.tree-label {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 2px;
}

.tree-label code {
    font-size: 0.8rem;
    background: #f1f5f9;
    padding: 1px 6px;
    border-radius: 4px;
    color: var(--primary);
}

.tree-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
    opacity: 0;
    transition: opacity 0.15s;
}

.tree-node:hover .tree-actions {
    opacity: 1;
}

.tree-node.level-1 {
    font-size: 0.95rem;
}

.tree-node.level-2 {
    font-size: 0.9rem;
}

.tree-node.level-3,
.tree-node.level-4,
.tree-node.level-5 {
    font-size: 0.85rem;
}

.doc-layout {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.doc-sidebar {
    width: 280px;
    min-width: 280px;
    flex-shrink: 0;
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 100px);
}

.doc-sidebar .card {
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 100px);
}

.doc-tree-wrap {
    overflow-y: auto;
    flex: 1;
}

.doc-content {
    flex: 1;
    min-width: 0;
}

.doc-tree-all {
    display: flex;
    align-items: center;
    padding: 8px 14px;
    text-decoration: none;
    color: #1e293b;
    font-weight: 500;
    font-size: 0.875rem;
    border-bottom: 1px solid #e2e8f0;
    transition: background 0.15s;
}

.doc-tree-folder {
    cursor: pointer;
}

.doc-tree-root {
    list-style: none;
    padding: 0;
    margin: 0;
}

.doc-tree-root ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.doc-tree-item {
    margin: 0;
}

.doc-tree-node {
    display: flex;
    align-items: center;
    padding: 5px 10px;
    border-bottom: 1px solid #f1f5f9;
    transition: background 0.15s;
}

.doc-tree-node.level-1 { padding-left: 8px; }
.doc-tree-node.level-2 { padding-left: 26px; }
.doc-tree-node.level-3 { padding-left: 44px; }
.doc-tree-node.level-4 { padding-left: 62px; }
.doc-tree-node.level-5 { padding-left: 80px; }

.doc-tree-node:hover {
    background: #f8fafc;
}

.doc-tree-node.selected {
    background: #eff6ff;
}

.doc-tree-toggle {
    cursor: pointer;
    width: 18px;
    text-align: center;
    flex-shrink: 0;
    color: #94a3b8;
    font-size: 0.7rem;
}

.doc-tree-toggle.no-children {
    cursor: default;
}

.doc-tree-toggle .toggle-spacer {
    display: inline-block;
    width: 18px;
}

.doc-tree-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #334155;
    font-size: 0.825rem;
    flex: 1;
    min-width: 0;
    padding: 2px 0;
}

.doc-tree-link:hover {
    color: #2563eb;
}

.doc-tree-link.active {
    color: #2563eb;
    font-weight: 600;
}

.doc-tree-name {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.doc-tree-count {
    background: #e2e8f0;
    color: #475569;
    font-size: 0.7rem;
    padding: 0 6px;
    border-radius: 10px;
    margin-left: auto;
    flex-shrink: 0;
    font-weight: 600;
    min-width: 18px;
    text-align: center;
}

.doc-tree-link.active .doc-tree-count {
    background: #bfdbfe;
    color: #1d4ed8;
}

.doc-tree-children {
    display: block;
}

@media (max-width: 992px) {
    .doc-layout {
        flex-direction: column;
    }
    .doc-sidebar {
        width: 100%;
        min-width: 100%;
        position: static;
        max-height: none;
    }
    .doc-sidebar .card {
        max-height: 300px;
    }
}