:root {
    --bg-sidebar: #0f172a;
    --sidebar-text: #94a3b8;
    --sidebar-text-hover: #f8fafc;
    --sidebar-active-bg: #1e293b;
    --sidebar-active-text: #ffffff;
    --bg-main: #f8fafc;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --font-family: 'Inter', sans-serif;
    --sidebar-width: 280px;
    --radius: 8px;
    --radius-sm: 4px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --transition: 150ms ease;
    --danger: #dc2626;
    --danger-hover: #b91c1c;
    --success: #16a34a;
    --warning: #f59e0b;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: var(--font-family);
    background-color: var(--bg-main);
    color: var(--text-primary);
    display: flex;
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

aside {
    width: var(--sidebar-width);
    background-color: var(--bg-sidebar);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border-right: 1px solid rgba(255,255,255,0.05);
    user-select: none;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 40;
    transform: translateX(0);
    transition: transform var(--transition);
}
.sidebar-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
    z-index: 50;
}
.sidebar-content { flex: 1; overflow-y: auto; padding: 0 12px; }
.sidebar-header { padding: 24px 20px 16px; }
.sidebar-header h1 { color: #fff; font-size: 16px; font-weight: 700; letter-spacing: .08em; }
.sidebar-nav { padding: 0 4px; }
.nav-section-title {
    font-size: 11px; text-transform: uppercase; letter-spacing: .05em;
    color: var(--text-muted); padding: 16px 12px 6px; font-weight: 600;
}
.nav-item {
    display: flex; align-items: center; gap: 10px; padding: 9px 12px;
    color: var(--sidebar-text); text-decoration: none; font-size: 13px;
    font-weight: 500; border-radius: 6px; transition: all .15s ease; margin-bottom: 2px;
}
.nav-item:hover { background: rgba(255,255,255,.04); color: var(--sidebar-text-hover); }
.nav-item.active { background: var(--sidebar-active-bg); color: var(--sidebar-active-text); }
.nav-item.disabled { opacity: .5; pointer-events: none; }
.sidebar-footer {
    padding: 16px; border-top: 1px solid rgba(255,255,255,.08);
    background: rgba(0,0,0,.1);
}
.user-profile { display: flex; align-items: center; gap: 12px; }
.user-avatar {
    width: 36px; height: 36px; border-radius: 50%; background: #334155;
    color: #fff; display: flex; align-items: center; justify-content: center;
    font-weight: 600; font-size: 14px; overflow: hidden;
}
.user-info { display: flex; flex-direction: column; }
.user-name { font-size: 13px; font-weight: 600; color: #f8fafc; }
.user-role { font-size: 11px; color: var(--sidebar-text); }
.system-status {
    display: flex; align-items: center; gap: 6px; font-size: 11px;
    color: var(--sidebar-text); margin-top: 6px;
}
.status-dot {
    width: 7px; height: 7px; background: #22c55e; border-radius: 50%;
    box-shadow: 0 0 6px rgba(34,197,94,.4);
}
.sidebar-overlay {
    display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 35; opacity: 0; transition: opacity var(--transition); pointer-events: none;
}

main {
    flex: 1; display: flex; flex-direction: column; overflow-y: auto; background: #fff;
    margin-left: var(--sidebar-width); min-height: 100vh;
}
.content-container {
    max-width: 1100px; width: 100%; margin: 0 auto; padding: 40px 48px; flex: 1;
}
.top-bar {
    display: none;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    background: var(--bg-main);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 30;
}
.top-bar-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -.02em;
    transition: color var(--transition);
}
.top-bar-title:hover { color: var(--accent); }
.top-bar-title:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 4px; }
header.main-header { margin-bottom: 28px; }
header.main-header h2 {
    font-size: 26px; font-weight: 700; color: var(--text-primary); letter-spacing: -.02em;
}
.search-action-bar {
    display: flex; gap: 12px; align-items: center; margin-bottom: 36px; flex-wrap: wrap;
}
.search-box {
    flex: 1; min-width: 280px; position: relative; display: flex; align-items: center; gap: 8px;
}
.search-box svg { position: absolute; left: 14px; color: var(--text-muted); width: 16px; height: 16px; }
.search-box input {
    flex: 1; padding: 11px 16px 11px 40px; background: var(--bg-main);
    border: 1px solid var(--border-color); border-radius: 8px; font-size: 13px;
    color: var(--text-primary); transition: all .2s ease; outline: none;
}
.search-box input:focus {
    border-color: var(--accent); background: #fff; box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
.search-box #searchBtn {
    white-space: nowrap; flex-shrink: 0;
}
.action-buttons { display: flex; gap: 8px; }
.btn {
    display: inline-flex; align-items: center; gap: 6px; padding: 10px 14px;
    background: var(--bg-main); border: 1px solid var(--border-color); border-radius: 8px;
    font-size: 13px; font-weight: 500; color: var(--text-primary); cursor: pointer;
    transition: all .15s ease; text-decoration: none; white-space: nowrap;
}
.btn:hover { background: #f1f5f9; border-color: #cbd5e1; }
.btn-primary { background: var(--text-primary); color: #fff; border-color: var(--text-primary); }
.btn-primary:hover { background: #1e293b; }
section { margin-bottom: 40px; }
.section-header-title {
    font-size: 14px; font-weight: 600; color: var(--text-primary);
    margin-bottom: 14px; letter-spacing: -.01em;
}
.table-card {
    border: 1px solid var(--border-color); border-radius: 10px; overflow: hidden; background: #fff;
}
.table-row {
    display: grid; grid-template-columns: 2fr 1fr 110px 110px 40px; align-items: center;
    padding: 12px 18px; border-bottom: 1px solid var(--border-color); font-size: 13px;
    color: var(--text-secondary); transition: background-color .1s ease; text-decoration: none; width: 100%; background: none; border-left: none; border-right: none; border-top: none; cursor: pointer;
}
.table-row:last-child { border-bottom: none; }
.table-row:hover { background: #f8fafc; }
.table-row:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.doc-title { color: var(--text-primary); font-weight: 500; display: flex; align-items: center; gap: 8px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; padding-right: 12px; }
.doc-workspace, .doc-time, .doc-author { color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.doc-action { display: flex; justify-content: flex-end; color: var(--text-muted); }
.workspaces-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 16px;
}
.workspace-card {
    background: #fff; border: 1px solid var(--border-color); border-radius: 10px;
    padding: 18px 20px; cursor: pointer; transition: all .2s ease; text-decoration: none; display: block;
}
.workspace-card:hover { border-color: #cbd5e1; box-shadow: 0 4px 12px rgba(0,0,0,.03); transform: translateY(-1px); }
.workspace-card h4 { font-size: 13px; font-weight: 700; color: var(--text-primary); letter-spacing: .03em; margin-bottom: 6px; }
.workspace-card p { font-size: 12px; color: var(--text-secondary); line-height: 1.4; }
footer.page-footer {
    padding: 16px 48px; border-top: 1px solid var(--border-color); font-size: 11px;
    color: var(--text-muted); display: flex; justify-content: space-between; background: var(--bg-main);
}

/* Editor styles */
.main-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; flex-wrap: wrap; gap: 12px; }
.editor-top { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 16px; flex-wrap: wrap; gap: 12px; }
.editor-top h2 { margin: 0; font-size: 20px; font-weight: 700; }
.btn-group { display: inline-flex; gap: 8px; }
.btn-secondary { background: var(--bg-main); color: var(--text-primary); border-color: var(--border-color); }
.btn-secondary:hover { background: #f1f5f9; border-color: #cbd5e1; }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { background: var(--danger-hover); border-color: var(--danger-hover); }
.btn-sm { padding: 6px 10px; font-size: 12px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.doc-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border-color); }
.doc-actions .btn { flex: 1; min-width: 120px; justify-content: center; }

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 12px; font-weight: 500; color: var(--text-secondary); margin-bottom: 6px; }
.field input, .field select, .field textarea {
    width: 100%; padding: 10px 12px; font-size: 14px; font-family: inherit;
    border: 1px solid var(--border-color); border-radius: var(--radius-sm);
    background: var(--card-bg); color: var(--text-primary);
    transition: border-color var(--transition), box-shadow var(--transition);
}
.field input:focus, .field select:focus, .field textarea:focus {
    outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
.field input::placeholder { color: var(--text-muted); }
.field small { display: block; margin-top: 4px; font-size: 11px; color: var(--text-muted); }
.editor { font-family: 'JetBrains Mono', 'Fira Code', monospace; font-size: 14px; line-height: 1.6; min-height: 50vh; resize: vertical; width: 100%; padding: 12px; border: 1px solid var(--border-color); border-radius: var(--radius); background: var(--card-bg); color: var(--text-primary); }
.editor:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15); }

.toolbar { display: flex; gap: 6px; margin-bottom: 8px; flex-wrap: wrap; }
.toolbar .btn { padding: 6px 10px; font-size: 12px; }
#editorFooter { display: flex; justify-content: space-between; align-items: center; padding-top: 8px; border-top: 1px solid var(--border-color); margin-top: 8px; }
#wordCount { font-size: 12px; color: var(--text-muted); }

.editor-grid { display: grid; grid-template-columns: 1fr 320px; gap: 24px; align-items: start; }
.editor-pane { min-width: 0; }
.preview-pane { min-width: 0; }
.preview { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 20px; min-height: 50vh; overflow-y: auto; line-height: 1.7; }
.preview h1 { font-size: 28px; margin: 24px 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--border-color); }
.preview h2 { font-size: 22px; margin: 20px 0 10px; padding-bottom: 6px; border-bottom: 1px solid var(--border-color); }
.preview h3 { font-size: 18px; margin: 16px 0 8px; }
.preview p { margin: 12px 0; }
.preview ul, .preview ol { margin: 12px 0; padding-left: 24px; }
.preview li { margin: 6px 0; }
.preview code { background: var(--bg-main); padding: 2px 6px; border-radius: var(--radius-sm); }
.preview pre { background: #0f172a; color: #e2e8f0; padding: 16px; border-radius: var(--radius); overflow-x: auto; margin: 16px 0; }
.preview pre code { background: none; padding: 0; font-size: inherit; }
.preview blockquote { border-left: 3px solid var(--accent); padding-left: 16px; margin: 16px 0; color: var(--text-secondary); font-style: italic; }
.preview table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 13px; }
.preview th, .preview td { border: 1px solid var(--border-color); padding: 8px 12px; text-align: left; }
.preview th { background: var(--bg-main); font-weight: 600; }
.preview a { color: var(--accent); text-decoration: none; }
.preview a:hover { text-decoration: underline; }
.preview img { max-width: 100%; border-radius: var(--radius); }

.notice { background: var(--bg-main); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 12px 16px; margin-bottom: 16px; font-size: 13px; color: var(--text-secondary); }
.notice.warning { border-color: var(--warning); background: #fffbeb; color: #92400e; }

.empty { padding: 48px 24px; text-align: center; color: var(--text-muted); }
.empty svg { width: 48px; height: 48px; margin-bottom: 16px; opacity: 0.5; }

/* Search results */
.search-results-container {
  margin-top: 24px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: var(--card-bg);
  overflow: hidden;
}
.search-results-container .table-row {
  border-bottom: 1px solid var(--border-color);
}
.search-results-container .table-row:last-child {
  border-bottom: none;
}
.search-results-container .empty {
  padding: 32px 24px;
}
.search-results-container .empty.error {
  color: var(--danger);
  border-top: 1px solid var(--border-color);
}

/* Modal */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 100; display: flex; align-items: center; justify-content: center; padding: 24px; opacity: 0; visibility: hidden; transition: opacity var(--transition), visibility var(--transition); }
.modal-overlay:not([hidden]) { opacity: 1; visibility: visible; }
.modal { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: var(--radius); box-shadow: var(--shadow-lg); width: 100%; max-width: 900px; max-height: 90vh; display: flex; flex-direction: column; transform: scale(0.95); transition: transform var(--transition); }
.modal-overlay:not([hidden]) .modal { transform: scale(1); }
.modal-header { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border-color); }
.modal-header h3 { font-size: 16px; font-weight: 600; }
.modal-close { width: 32px; height: 32px; border-radius: var(--radius-sm); background: transparent; border: none; color: var(--text-secondary); cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 18px; line-height: 1; transition: background var(--transition), color var(--transition); }
.modal-close:hover { background: var(--bg-main); color: var(--text-primary); }
.modal-body { padding: 20px; overflow-y: auto; flex: 1; }
.modal-footer { display: flex; justify-content: flex-end; gap: 8px; padding: 16px 20px; border-top: 1px solid var(--border-color); }

/* Version history */
.version-list { display: flex; flex-direction: column; gap: 8px; }
.version-item { display: flex; align-items: center; gap: 12px; padding: 12px; background: var(--bg-main); border: 1px solid var(--border-color); border-radius: var(--radius); transition: all var(--transition); }
.version-item:hover { border-color: var(--accent); }
.version-meta { flex: 1; min-width: 0; }
.version-date { font-weight: 500; color: var(--text-primary); font-size: 13px; }
.version-author { font-size: 12px; color: var(--text-muted); }
.version-actions { display: flex; gap: 8px; }
.version-content { display: none; margin-top: 8px; padding: 12px; background: var(--card-bg); border: 1px solid var(--border-color); border-radius: var(--radius); font-size: 12px; font-family: monospace; white-space: pre-wrap; max-height: 300px; overflow-y: auto; }
.version-item.expanded .version-content { display: block; }

/* Shortcuts help */
.shortcuts-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; }
.shortcut-item { display: flex; align-items: center; gap: 12px; padding: 12px; background: var(--bg-main); border: 1px solid var(--border-color); border-radius: var(--radius); }
.shortcut-key { font-family: 'JetBrains Mono', monospace; font-size: 12px; background: var(--card-bg); border: 1px solid var(--border-color); border-radius: var(--radius-sm); padding: 4px 8px; color: var(--text-primary); min-width: 80px; text-align: center; }
.shortcut-desc { font-size: 13px; color: var(--text-secondary); }

/* Toast */
.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 200; display: flex; flex-direction: column; gap: 8px; pointer-events: none; }
.toast { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 12px 16px; box-shadow: var(--shadow-lg); display: flex; align-items: center; gap: 12px; min-width: 280px; max-width: 400px; animation: slideIn 0.3s ease; pointer-events: auto; }
.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--danger); }
.toast.warning { border-left: 3px solid var(--warning); }
@keyframes slideIn { from { opacity: 0; transform: translateX(100%); } to { opacity: 1; transform: translateX(0); } }

/* Loading */
.loading { display: flex; align-items: center; justify-content: center; padding: 48px; color: var(--text-muted); }
.loading::after { content: ''; width: 24px; height: 24px; border: 2px solid var(--border-color); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; margin-left: 12px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Search box icon fallback */
.search-box::before { content: none; }

/* Responsive */
@media (max-width: 1024px) {
    .editor-grid { grid-template-columns: 1fr; }
    .preview-pane { order: -1; }
    .content-container { padding: 32px; }
}
@media (max-width: 768px) {
    :root { --sidebar-width: 280px; }
    aside { transform: translateX(-100%); }
    aside.open { transform: translateX(0); }
    .top-bar { display: flex; }
    .sidebar-toggle { display: flex; }
    main { margin-left: 0; }
    .page-footer { margin-left: 0; padding: 12px 24px; }
    .sidebar-overlay.visible { display: block; opacity: 1; pointer-events: auto; }
    .content-container { padding: 24px 16px; padding-top: 80px; }
    header.main-header { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
    header.main-header h2 { font-size: 22px; }
    .search-action-bar { flex-direction: column; align-items: stretch; gap: 12px; margin-bottom: 24px; }
    .search-box { min-width: 0; max-width: none; }
    .action-buttons { justify-content: flex-start; flex-wrap: wrap; }
    .table-row { grid-template-columns: 1fr; gap: 4px; padding: 12px 16px; }
    .table-row span { justify-self: start !important; white-space: normal; }
    .doc-title { padding-right: 0; }
    .workspaces-grid { grid-template-columns: 1fr; }
    .toolbar { justify-content: center; }
    .modal { margin: 12px; max-height: calc(100vh - 24px); }
    .shortcuts-grid { grid-template-columns: 1fr; }
    .toast-container { left: 16px; right: 16px; bottom: 16px; }
    .toast { min-width: 0; max-width: none; }
    footer.page-footer { padding: 12px 16px; flex-direction: column; gap: 4px; text-align: center; }
}
@media (max-width: 480px) {
    .btn { padding: 12px 16px; font-size: 14px; }
    .field input, .field select, .field textarea { font-size: 16px; }
    .content-container { padding: 16px; padding-top: 72px; }
    header.main-header h2 { font-size: 20px; }
    .top-bar-title { font-size: 18px; }
    .search-box input { padding: 14px 16px 14px 44px; font-size: 16px; }
    .action-buttons { flex-direction: column; }
    .action-buttons .btn { width: 100%; justify-content: center; }
}

/* Print */
@media print {
    aside, .sidebar-toggle, .sidebar-overlay, .page-footer, .toolbar, .editor-top, #editorFooter, .modal-overlay, .doc-actions { display: none !important; }
    main { margin-left: 0; }
    .content-container { padding: 0; }
    .preview { border: none; padding: 0; min-height: auto; }
    .editor { border: none; box-shadow: none; padding: 0; min-height: auto; }
    .notice { display: none; }
}