/* ─── Reset & Base ──────────────────────────────────────────────────── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #0D1B2A;
  --bg-secondary: #1B2838;
  --bg-tertiary: #243447;
  --bg-hover: #2C3E50;
  --text-primary: #E0E0E0;
  --text-secondary: #999;
  --text-muted: #666;
  --accent: #3498DB;
  --accent-hover: #2980B9;
  --success: #2ECC71;
  --warning: #F39C12;
  --danger: #E74C3C;
  --border: #2C3E50;
  --sidebar-width: 300px;
  --info-width: 280px;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font);
  font-size: 13px;
  color: var(--text-primary);
  background: var(--bg-primary);
}

/* ─── Layout ────────────────────────────────────────────────────────── */
body {
  display: flex;
}

#sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-tertiary) transparent;
}

#main-area {
  flex: 1;
  position: relative;
  overflow: hidden;
}

#info-panel {
  width: var(--info-width);
  min-width: var(--info-width);
  height: 100vh;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  padding: 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-tertiary) transparent;
}

/* ─── Sidebar ───────────────────────────────────────────────────────── */
.sidebar-header {
  padding: 20px 16px 12px;
  border-bottom: 1px solid var(--border);
}

.logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--accent);
}

.tagline {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
  letter-spacing: 0.5px;
}

.sidebar-section {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.section-label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.hint {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text-muted);
}

/* ─── Controls ──────────────────────────────────────────────────────── */
.control-select,
.control-input {
  width: 100%;
  padding: 8px 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s;
}

.control-select:focus,
.control-input:focus {
  border-color: var(--accent);
}

.control-select option {
  background: var(--bg-secondary);
}

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

.control-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 2px;
  outline: none;
}

.control-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: transform 0.15s;
}

.control-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.slider-value {
  font-weight: 600;
  color: var(--text-primary);
  min-width: 32px;
  text-align: right;
}

.slider-unit {
  color: var(--text-muted);
  font-size: 11px;
}

/* ─── Room List ─────────────────────────────────────────────────────── */
.room-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 250px;
  overflow-y: auto;
}

.room-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  background: var(--bg-tertiary);
  border-radius: 6px;
  transition: background 0.15s;
}

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

.room-color-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.room-label {
  flex: 1;
  font-size: 12px;
}

.room-count-controls {
  display: flex;
  align-items: center;
  gap: 4px;
}

.room-count-btn {
  width: 22px;
  height: 22px;
  border: none;
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.room-count-btn:hover {
  background: var(--accent);
}

.room-count {
  min-width: 18px;
  text-align: center;
  font-weight: 600;
  font-size: 12px;
}

.add-room-wrapper {
  position: relative;
  margin-top: 8px;
}

.add-room-menu {
  display: none;
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px;
  margin-bottom: 4px;
  max-height: 200px;
  overflow-y: auto;
  z-index: 10;
}

.add-room-menu.visible {
  display: block;
}

.add-room-option {
  display: block;
  width: 100%;
  padding: 6px 10px;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 12px;
  text-align: left;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.15s;
}

.add-room-option:hover {
  background: var(--bg-hover);
}

/* ─── Buttons ───────────────────────────────────────────────────────── */
.btn {
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}

.btn:hover {
  background: var(--bg-hover);
  border-color: var(--text-muted);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
  width: 100%;
  padding: 10px;
  font-size: 13px;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  flex: 1;
}

.btn-icon {
  width: 36px;
  padding: 8px;
  text-align: center;
  font-weight: 700;
}

.btn-icon.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-add {
  width: 100%;
  font-size: 12px;
  color: var(--text-secondary);
}

.btn-small {
  flex: 1;
  padding: 6px 10px;
  font-size: 11px;
}

.btn-row {
  display: flex;
  gap: 8px;
}

.sidebar-actions {
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}

.export-section .btn-row {
  margin-top: 0;
}

.sidebar-footer {
  padding: 12px 16px;
  margin-top: auto;
}

.shortcut-hint {
  font-size: 11px;
  color: var(--text-muted);
}

kbd {
  padding: 2px 6px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 3px;
  font-family: var(--font);
  font-size: 11px;
}

/* ─── Main Area ─────────────────────────────────────────────────────── */
#canvas-2d {
  width: 100%;
  height: 100%;
  display: block;
}

#container-3d {
  width: 100%;
  height: 100%;
}

#view-controls {
  position: absolute;
  top: 12px;
  left: 12px;
  display: flex;
  gap: 4px;
  z-index: 5;
}

.btn-view {
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 4px;
}

.btn-view.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-floor {
  padding: 4px 8px;
  font-size: 10px;
}

#floor-nav {
  display: flex;
  gap: 2px;
  margin-left: 8px;
}

#empty-state {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: var(--text-muted);
  pointer-events: none;
}

.empty-icon {
  font-size: 64px;
  line-height: 1;
  opacity: 0.3;
  margin-bottom: 16px;
}

#empty-state p {
  font-size: 14px;
  margin-bottom: 8px;
}

.empty-hint {
  font-size: 12px !important;
  color: var(--text-muted) !important;
}

/* ─── Info Panel ────────────────────────────────────────────────────── */
.info-section {
  margin-bottom: 20px;
}

.info-section h3 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.score-display {
  display: flex;
  align-items: center;
  gap: 12px;
}

.score-badge {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  background: var(--bg-tertiary);
  color: var(--text-muted);
}

.score-badge.grade-a {
  background: rgba(46, 204, 113, 0.2);
  color: var(--success);
  border: 2px solid var(--success);
}

.score-badge.grade-b {
  background: rgba(52, 152, 219, 0.2);
  color: var(--accent);
  border: 2px solid var(--accent);
}

.score-badge.grade-c {
  background: rgba(243, 156, 18, 0.2);
  color: var(--warning);
  border: 2px solid var(--warning);
}

.score-badge.grade-d {
  background: rgba(231, 76, 60, 0.2);
  color: var(--danger);
  border: 2px solid var(--danger);
}

.score-grade {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
}

/* ─── Issues ────────────────────────────────────────────────────────── */
.issues-list {
  max-height: 200px;
  overflow-y: auto;
}

.no-issues {
  color: var(--text-muted);
  font-size: 12px;
  font-style: italic;
  padding: 8px 0;
}

.issue-item {
  padding: 6px 10px;
  margin-bottom: 4px;
  border-radius: 4px;
  font-size: 11px;
  line-height: 1.4;
}

.issue-error {
  background: rgba(231, 76, 60, 0.15);
  color: #E74C3C;
  border-left: 3px solid #E74C3C;
}

.issue-warning {
  background: rgba(243, 156, 18, 0.15);
  color: #F39C12;
  border-left: 3px solid #F39C12;
}

/* ─── Room Table ────────────────────────────────────────────────────── */
.room-table {
  width: 100%;
  border-collapse: collapse;
}

.room-table td {
  padding: 4px 0;
  font-size: 12px;
  border-bottom: 1px solid var(--border);
}

.room-table td:last-child {
  text-align: right;
  color: var(--text-secondary);
}

.total-row td {
  border-top: 2px solid var(--border);
  border-bottom: none;
  padding-top: 8px;
}

/* ─── FEA Results ───────────────────────────────────────────────────── */
.fea-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

.fea-item {
  padding: 8px;
  background: var(--bg-tertiary);
  border-radius: 6px;
}

.fea-item:last-child {
  grid-column: 1 / -1;
}

.fea-label {
  display: block;
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.fea-value {
  font-size: 14px;
  font-weight: 600;
}

.fea-pass {
  color: var(--success) !important;
}

.fea-fail {
  color: var(--danger) !important;
}

.fea-legend {
  margin-top: 8px;
}

.legend-bar {
  height: 8px;
  border-radius: 4px;
  background: linear-gradient(to right, #2ECC71, #F1C40F, #E74C3C);
}

.legend-labels {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ─── Scrollbar ─────────────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--bg-hover);
}

/* ─── Animations ────────────────────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.room-item {
  animation: fadeIn 0.2s ease-out;
}

.issue-item {
  animation: fadeIn 0.15s ease-out;
}

/* ─── Responsive ────────────────────────────────────────────────────── */
@media (max-width: 1200px) {
  :root {
    --info-width: 240px;
  }
}

@media (max-width: 900px) {
  #info-panel {
    display: none;
  }
}