/* ============================================================
   1. CSS Custom Properties
   ============================================================ */
:root {
  /* Surface & Text Colors */
  --bg-page: #ffffff;
  --bg-alt-row: #f8f9fa;
  --bg-header: #1a1a2e;
  --bg-sidebar: #f4f5f7;
  --bg-topbar: #1a1a2e;
  --bg-legend: #ffffff;
  --bg-footer: #f8f9fa;
  --border-table: #dee2e6;
  --text-header: #ffffff;
  --text-body: #333333;
  --text-heading: #1a1a2e;
  --text-muted: #6b7280;
  --text-link: #2563eb;
  --accent: #2563eb;
  --search-highlight: #fef08a;

  /* Typography */
  --font-stack: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;

  /* Density cell padding (default: Comfortable) */
  --density-cell-padding-top: 6px;
  --density-cell-padding-bottom: 6px;
  --density-cell-padding-left: 8px;
  --density-cell-padding-right: 8px;

  /* Brand sticky column offset (set by JS) */
  --brand-sticky-left: 150px;
}

/* ============================================================
   2. Reset / Base
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-stack);
  background: var(--bg-page);
  color: var(--text-body);
  font-size: 12px;
  line-height: 1.4;
}

/* ============================================================
   3. Layout
   ============================================================ */

/* Top bar */
#top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 48px;
  background: var(--bg-topbar);
  display: flex;
  align-items: center;
  padding: 0 16px;
  z-index: 50;
  gap: 12px;
}

#search-input {
  flex-grow: 1;
  max-width: 400px;
  font-size: 14px;
  line-height: 1.5;
  font-family: var(--font-stack);
  padding: 6px 10px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-header);
  outline: none;
}

#search-input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

#search-input:focus {
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.15);
}

#results-count {
  color: rgba(255, 255, 255, 0.7);
  font-size: 11px;
  white-space: nowrap;
  min-width: 80px;
  text-align: center;
}

/* Sidebar + table container */
.content-area {
  display: flex;
  margin-top: 48px;
}

/* Sidebar */
#sidebar {
  width: 280px;
  background: var(--bg-sidebar);
  overflow-y: auto;
  height: calc(100vh - 48px - 32px);
  position: sticky;
  top: 48px;
  flex-shrink: 0;
}

.sidebar-collapsed #sidebar {
  display: none;
}

/* Table wrapper */
#table-wrapper {
  flex: 1;
  overflow-x: auto;
  min-width: 0;
}

/* ============================================================
   4. Legend Bar
   ============================================================ */
#legend-bar {
  position: sticky;
  top: 48px;
  z-index: 8;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px 16px;
  background: var(--bg-legend);
  border-bottom: 1px solid var(--border-table);
}

.legend-row {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.legend-swatch {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 3px;
  font-size: 11px;
  font-weight: 600;
  line-height: 1.3;
  white-space: nowrap;
}

/* ============================================================
   5. Table
   ============================================================ */
#meters-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

#table-header {
  position: sticky;
  top: calc(48px + var(--legend-bar-height, 44px));
  z-index: 10;
}

#table-header.header-shadow {
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
}

th {
  background: var(--bg-header);
  color: var(--text-header);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.3;
  padding: 8px;
  text-align: left;
  white-space: nowrap;
  cursor: pointer;
  position: relative;
  user-select: none;
}

th:hover {
  background: rgba(255, 255, 255, 0.05);
}

.sort-indicator {
  margin-left: 4px;
  color: var(--accent);
  font-size: 10px;
}

td {
  padding: var(--density-cell-padding-top) var(--density-cell-padding-right) var(--density-cell-padding-bottom) var(--density-cell-padding-left);
  border-bottom: 1px solid var(--border-table);
  white-space: nowrap;
  font-size: 12px;
  line-height: 1.4;
}

/* ============================================================
   6. Sticky Columns
   ============================================================ */

/* Model column (column 1) */
th:nth-child(1),
td:nth-child(1) {
  position: sticky;
  left: 0;
  z-index: 5;
  background: var(--bg-page);
}

th:nth-child(1) {
  z-index: 11;
  background: var(--bg-header);
}

/* Brand column (column 2) */
th:nth-child(2),
td:nth-child(2) {
  position: sticky;
  left: var(--brand-sticky-left);
  z-index: 4;
  background: var(--bg-page);
}

th:nth-child(2) {
  z-index: 10;
  background: var(--bg-header);
}

/* Opaque backgrounds for sticky body cells */
td:nth-child(1),
td:nth-child(2) {
  background: var(--bg-page);
}

tr:nth-child(even) td:nth-child(1),
tr:nth-child(even) td:nth-child(2) {
  background: var(--bg-alt-row);
}

/* ============================================================
   7. Row Alternating + Hover
   ============================================================ */
tr:nth-child(even) td {
  background: var(--bg-alt-row);
}

tr:hover td {
  box-shadow: inset 0 0 0 1000px rgba(37, 99, 235, 0.04);
  transition: box-shadow 0.1s ease;
}

tr {
  cursor: pointer;
}

/* ============================================================
   8. Density Modes
   ============================================================ */
.density-compact td {
  padding: 2px 6px 2px 4px;
}

.density-comfortable td {
  padding: 6px 10px 6px 8px;
}

.density-spacious td {
  padding: 12px 14px 12px 16px;
}

/* ============================================================
   9. Sidebar Components
   ============================================================ */
#sidebar h3 {
  font-size: 11px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-heading);
  padding: 12px 16px 8px;
  border-bottom: 1px solid var(--border-table);
}

.filter-group {
  padding: 4px 16px 12px;
}

.filter-group label {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 0;
  font-size: 12px;
  cursor: pointer;
}

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

.numeric-filter {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
}

.numeric-filter label {
  font-size: 11px;
  color: var(--text-muted);
  padding: 0;
}

.numeric-filter input[type="number"] {
  width: 70px;
  font-size: 12px;
  padding: 2px 4px;
  border: 1px solid var(--border-table);
  border-radius: 3px;
  font-family: var(--font-stack);
}

.numeric-filter-row {
  display: flex;
  gap: 8px;
  align-items: center;
}
.numeric-field {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
}
.numeric-field input[type="number"] {
  width: 70px;
  font-size: 12px;
  padding: 2px 4px;
  border: 1px solid var(--border-table);
  border-radius: 3px;
  font-family: var(--font-stack);
}

/* Collapsible filter sections */
.sidebar-section .filter-group {
  max-height: 1000px;
  overflow: hidden;
  transition: max-height 0.2s ease-out, padding 0.2s ease-out;
  padding: 4px 16px 12px;
}
.sidebar-section.collapsed .filter-group {
  max-height: 0;
  padding-top: 0;
  padding-bottom: 0;
}
.sidebar-section h3 {
  cursor: pointer;
  user-select: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.sidebar-section h3::after {
  content: '\2212';   /* minus/horizontal line for expanded */
  font-size: 14px;
  font-weight: 400;
  color: var(--text-muted);
  line-height: 1;
}
.sidebar-section.collapsed h3::after {
  content: '+';   /* plus for collapsed */
}

.clear-btn {
  background: var(--accent);
  color: white;
  border: none;
  padding: 6px 16px;
  font-size: 12px;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font-stack);
}

#sidebar .clear-btn {
  width: 100%;
}

.clear-btn:hover {
  opacity: 0.9;
}

/* ============================================================
   10. Density Toggle (in top bar)
   ============================================================ */
#density-toggle {
  display: flex;
  gap: 0;
}

.density-btn {
  font-size: 11px;
  padding: 4px 8px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  font-family: var(--font-stack);
  line-height: 1.3;
}

.density-btn:first-child {
  border-radius: 3px 0 0 3px;
}

.density-btn:last-child {
  border-radius: 0 3px 3px 0;
}

.density-btn + .density-btn {
  border-left: none;
}

.density-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

/* ============================================================
   11. Column Visibility Dropdown
   ============================================================ */
#column-visibility-btn {
  font-size: 11px;
  padding: 4px 10px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  border-radius: 3px;
  font-family: var(--font-stack);
  white-space: nowrap;
  position: relative;
}

#column-visibility-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

#column-visibility-menu,
.dropdown-menu {
  position: absolute;
  right: 0;
  top: 100%;
  background: white;
  border: 1px solid var(--border-table);
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  z-index: 100;
  min-width: 200px;
  max-height: 400px;
  overflow-y: auto;
}

#column-visibility-menu[hidden],
.dropdown-menu[hidden] {
  display: none;
}

#column-visibility-menu #column-show-all,
#column-visibility-menu #column-hide-all,
.dropdown-menu label {
  display: block;
  width: 100%;
  padding: 6px 12px;
  font-size: 11px;
  font-weight: 600;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-table);
  cursor: pointer;
  text-align: left;
  font-family: var(--font-stack);
  color: var(--text-body);
}

#column-visibility-menu #column-show-all:hover,
#column-visibility-menu #column-hide-all:hover {
  background: var(--bg-sidebar);
}

#column-checklist label,
.dropdown-menu label {
  display: block;
  padding: 4px 12px;
  font-size: 12px;
  cursor: pointer;
}

#column-checklist label:hover,
.dropdown-menu label:hover {
  background: var(--bg-alt-row);
}

.col-vis-wrapper {
  position: relative;
}

/* ============================================================
   12. Search Match Highlight
   ============================================================ */
mark.search-match {
  background: var(--search-highlight);
  color: inherit;
  padding: 0 1px;
  border-radius: 1px;
}

/* ============================================================
   13. Mobile Sidebar Drawer (<768px)
   ============================================================ */
@media (max-width: 767px) {
  #sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 85vw;
    min-width: 280px;
    max-width: 360px;
    height: 100vh;
    z-index: 100;
    transform: translateX(-100%);
    transition: transform 200ms ease-out;
    display: block;
    overscroll-behavior: contain;
  }

  #sidebar.open {
    transform: translateX(0);
  }

  .sidebar-collapsed #sidebar {
    display: block;
  }

  #sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 99;
  }

  #sidebar-backdrop.hidden {
    display: none;
  }

  #sidebar-close {
    display: block;
    position: absolute;
    top: 8px;
    right: 8px;
    background: transparent;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: var(--text-body);
    padding: 4px;
    z-index: 1;
  }
}

/* ============================================================
   14. Mobile Responsive
   ============================================================ */
@media (max-width: 1024px) {
  #table-wrapper {
    overflow-x: auto;
  }
  th, td {
    padding: 4px 6px;
  }
}

@media (max-width: 767px) {
  #top-bar {
    padding: 0 8px;
    gap: 6px;
  }

  #search-input {
    max-width: 100%;
  }

  #results-count {
    min-width: auto;
    font-size: 10px;
  }
}

/* ============================================================
   15. Loading / Empty / Error States
   ============================================================ */
.state-overlay {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 48px;
  text-align: center;
}

.state-overlay[hidden] {
  display: none;
}

.state-overlay h2 {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-heading);
}

.state-overlay p {
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-muted);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid #e0e0e0;
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ============================================================
   16. Footer
   ============================================================ */
#page-footer {
  height: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 16px;
  background: var(--bg-footer);
  border-top: 1px solid var(--border-table);
  color: var(--text-muted);
  font-size: 11px;
  line-height: 1.3;
}

/* ============================================================
   17. Focus Indicators
   ============================================================ */
*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

input[type="search"]:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--accent);
}

/* ============================================================
   18. Scrollbar Styling
   ============================================================ */
#sidebar::-webkit-scrollbar,
#table-wrapper::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

#sidebar::-webkit-scrollbar-thumb,
#table-wrapper::-webkit-scrollbar-thumb {
  background: #ccc;
  border-radius: 3px;
}

#sidebar::-webkit-scrollbar-track,
#table-wrapper::-webkit-scrollbar-track {
  background: transparent;
}

/* ============================================================
   Reduced Motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation: none;
  }

  #sidebar {
    transition: none;
  }

  tr:hover td {
    transition: none;
  }
}