/* =========================================================
   Kladde Web - Dark Slate Theme (Matching Kladde Desk)
   ========================================================= */

:root {
  --bg-main: #0A0E17;
  --bg-sidebar: #0B1120;
  --bg-card: #0F172A;
  --bg-card-hover: #1E293B;
  --bg-card-selected: #1E293B;
  --bg-input: #0A0F1D;

  --border-subtle: #1E293B;
  --border-strong: #334155;
  --border-accent: #38BDF8;

  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;

  --accent: #38BDF8;
  --accent-hover: #0284C7;
  --accent-glow: rgba(56, 189, 248, 0.15);

  --badge-green-bg: #064E3B;
  --badge-green-border: #059669;
  --badge-green-text: #34D399;

  --badge-draft-bg: #451A03;
  --badge-draft-border: #D97706;
  --badge-draft-text: #FBBF24;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-full: 9999px;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-primary);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ==================== HEADER ==================== */
.app-header {
  height: 56px;
  background-color: #0A0E17;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  z-index: 10;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-lg);
  background: #0F172A;
  border: 1.5px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.brand-titles {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-badge {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background: var(--bg-card-hover);
  color: var(--accent);
  font-weight: 600;
  border: 1px solid var(--border-strong);
}

.brand-subtitle {
  font-size: 10px;
  color: var(--text-secondary);
}

.header-center {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nas-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-secondary);
  background: var(--bg-card);
  padding: 6px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.nas-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--badge-green-text);
  box-shadow: 0 0 8px rgba(52, 211, 153, 0.6);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  padding: 6px 12px;
  border-radius: var(--radius-md);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
}

/* ==================== BUTTONS ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  user-select: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #0F172A;
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #FFFFFF;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-strong);
}
.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  color: var(--accent);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-strong);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--bg-card-hover);
}

.btn-sm {
  padding: 4px 8px;
  font-size: 11px;
}

.btn-icon-only {
  padding: 6px 8px;
}

/* ==================== MAIN 3-COLUMN WORKSPACE ==================== */
.workspace-grid {
  flex: 1;
  display: grid;
  grid-template-columns: 310px 1fr 1.35fr;
  overflow: hidden;
  background-color: var(--bg-main);
}

/* ==================== LEFT SIDEBAR ==================== */
.sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  padding: 16px;
  gap: 16px;
  overflow-y: auto;
}

.sidebar-section-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Search Box */
.search-wrapper {
  position: relative;
}

.search-input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 8px 32px 8px 10px;
  font-size: 13px;
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.15s ease;
}

.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.search-clear-btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  display: none;
}

.search-clear-btn.visible {
  display: block;
}

/* Status Filter Radios */
.status-filters {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-primary);
  cursor: pointer;
}

.radio-label input[type="radio"] {
  accent-color: var(--accent);
}

/* TreeView */
.treeview-container {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 140px;
  max-height: 280px;
  overflow-y: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 6px 4px;
  background: var(--bg-main);
}

.tree-node {
  display: flex;
  align-items: center;
  padding: 5px 8px;
  border-radius: var(--radius-md);
  cursor: pointer;
  user-select: none;
  font-size: 12px;
  color: var(--text-primary);
  transition: background 0.12s ease;
  margin-bottom: 1px;
}

.tree-node:hover {
  background: var(--bg-card-hover);
}

.tree-node.selected {
  background: var(--bg-card-selected);
  color: var(--accent);
  font-weight: 600;
  border-left: 2px solid var(--accent);
}

.tree-arrow {
  width: 14px;
  font-size: 9px;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-block;
  transition: transform 0.15s ease;
}

.tree-arrow.expanded {
  transform: rotate(9deg);
}

.tree-arrow.leaf {
  visibility: hidden;
}

.tree-icon {
  margin-right: 6px;
  font-size: 13px;
}

.tree-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tree-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  margin-left: 6px;
}

.tree-children {
  margin-left: 14px;
  border-left: 1px dashed var(--border-subtle);
  padding-left: 2px;
  display: block;
}

.tree-children.collapsed {
  display: none;
}

/* Category List */
.category-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: 180px;
  overflow-y: auto;
}

.category-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  border-radius: var(--radius-md);
  font-size: 12px;
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.12s ease;
}

.category-item:hover {
  background: var(--bg-card-hover);
}

.category-item.selected {
  background: var(--bg-card);
  color: var(--accent);
  font-weight: 600;
  border-left: 2px solid var(--accent);
}

.category-badge {
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg-main);
  padding: 1px 6px;
  border-radius: var(--radius-full);
}

/* ==================== CENTER: DOCUMENT LIST ==================== */
.document-column {
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  background: var(--bg-main);
  overflow: hidden;
}

.column-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #0B1120;
}

.column-header-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.filter-breadcrumb {
  font-size: 11px;
  color: var(--text-secondary);
  font-weight: normal;
}

.document-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* Document Item Card */
.doc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  display: grid;
  grid-template-columns: 36px 1fr auto;
  gap: 12px;
  align-items: center;
  cursor: pointer;
  transition: all 0.12s ease;
}

.doc-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.doc-card.selected {
  border-color: var(--accent);
  background: var(--bg-card-selected);
  box-shadow: 0 0 0 1px var(--accent);
}

.doc-thumb {
  width: 34px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: #0A0F1D;
  border: 1px solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.doc-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  overflow: hidden;
}

.doc-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.doc-meta-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 11px;
  color: var(--text-secondary);
}

.doc-date {
  color: var(--text-secondary);
}

.doc-sender {
  color: var(--text-secondary);
  max-width: 140px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.doc-category-badge {
  background: #334155;
  color: var(--text-primary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 10px;
  font-weight: 600;
}

.doc-location-badge {
  background: #0F172A;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  font-size: 10px;
  font-weight: 600;
  max-width: 180px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.doc-status-col {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
}

.status-pill {
  font-size: 9px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.status-pill.uploaded {
  background: var(--badge-green-bg);
  border: 1px solid var(--badge-green-border);
  color: var(--badge-green-text);
}

.status-pill.pending {
  background: var(--badge-draft-bg);
  border: 1px solid var(--badge-draft-border);
  color: var(--badge-draft-text);
}

.doc-size {
  font-size: 10px;
  color: var(--text-muted);
}

/* Empty State */
.empty-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 40px 20px;
  text-align: center;
  color: var(--text-secondary);
}

.empty-icon {
  font-size: 44px;
  margin-bottom: 12px;
}

.empty-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.empty-subtitle {
  font-size: 12px;
  color: var(--text-secondary);
  max-width: 320px;
}

/* ==================== RIGHT: PREVIEW & INSPECTOR ==================== */
.preview-column {
  display: flex;
  flex-direction: column;
  background: #0A0E17;
  overflow: hidden;
}

.preview-header-bar {
  padding: 10px 16px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.preview-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
  overflow: hidden;
}

.preview-doc-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.preview-header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

/* PDF Viewer Toolbar */
.pdf-viewer-toolbar {
  height: 40px;
  background: #0B1120;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  user-select: none;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.pdf-page-display,
.pdf-zoom-display {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-primary);
  min-width: 70px;
  text-align: center;
}

/* PDF Canvas Wrapper */
.pdf-viewer-wrapper {
  flex: 1;
  background: #111827;
  position: relative;
  overflow: auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 16px;
}

.pdf-canvas-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 100%;
}

#pdfCanvas {
  max-width: 100%;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
  border-radius: var(--radius-sm);
  background: #FFFFFF;
}

/* PDF Loading Overlay */
.pdf-loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 14, 23, 0.7);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text-secondary);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
}

.pdf-loading-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.pdf-spinner {
  width: 28px;
  height: 28px;
  border: 3px solid var(--border-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Collapsible Metadata Panel */
.metadata-panel {
  background: var(--bg-card);
  border-top: 1px solid var(--border-strong);
  display: flex;
  flex-direction: column;
  max-height: 290px;
  overflow-y: auto;
  transition: all 0.2s ease;
}

.metadata-panel.collapsed {
  display: none;
}

.metadata-panel-header {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.metadata-panel-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
}

.metadata-form {
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.form-row {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 10px;
}

.form-row-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.form-label {
  font-size: 11px;
  color: var(--text-secondary);
}

.form-value {
  background: var(--bg-input);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 12px;
  color: var(--text-primary);
}

/* ==================== FOOTER ==================== */
.app-footer {
  height: 28px;
  background: #080B12;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  font-size: 11px;
  color: var(--text-secondary);
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-status-icon {
  color: var(--badge-green-text);
}

/* ==================== LOGIN MODAL ==================== */
.login-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.login-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  width: 380px;
  max-width: 90vw;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.login-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
}

.login-logo {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: #0F172A;
  border: 2px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.login-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.login-subtitle {
  font-size: 12px;
  color: var(--text-secondary);
}

.login-error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid #EF4444;
  color: #FCA5A5;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  font-size: 12px;
  display: none;
}

.login-error.visible {
  display: block;
}

.login-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.login-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.login-input {
  background: var(--bg-input);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  font-size: 13px;
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.15s ease;
}

.login-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.login-footer-hint {
  font-size: 11px;
  color: var(--text-muted);
  text-align: center;
  margin-top: 4px;
}