/* ═══════════════════════════════════════════════════
   Robot Explorer — Themeable industrial control panel
   ═══════════════════════════════════════════════════ */

:root,
[data-theme="dark"] {
  --bg-dark:       #0f1114;
  --bg-panel:      #181b20;
  --bg-surface:    #1e2228;
  --bg-hover:      #252a31;
  --bg-active:     #2a3038;

  --border:        #2a2e35;
  --border-light:  #353a42;

  --text:          #d1d5db;
  --text-muted:    #6b7280;
  --text-dim:      #4b5563;

  --accent:        #22d3a7;
  --accent-dim:    #1a9e7e;
  --accent-glow:   rgba(34, 211, 167, 0.15);
  --accent-text:   #0f1114;

  --scene-bg:      #0f1114;
  --scene-grid:    #3a3f48;

  --font-body:     'DM Sans', system-ui, sans-serif;
  --font-mono:     'JetBrains Mono', ui-monospace, monospace;

  --sidebar-left-w:  360px;
  --sidebar-right-w: 240px;
  --radius:        6px;
  --radius-sm:     4px;
}

[data-theme="light"] {
  --bg-dark:       #f0f1f3;
  --bg-panel:      #ffffff;
  --bg-surface:    #f5f5f7;
  --bg-hover:      #ecedf0;
  --bg-active:     #e4e5e9;

  --border:        #d8dae0;
  --border-light:  #c8cad0;

  --text:          #1a1d23;
  --text-muted:    #6b7280;
  --text-dim:      #9ca3af;

  --accent:        #0d9373;
  --accent-dim:    #0b7d63;
  --accent-glow:   rgba(13, 147, 115, 0.12);
  --accent-text:   #ffffff;

  --scene-bg:      #e8eaed;
  --scene-grid:    #b0b4bc;
}

/* ── Reset ── */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text);
  background: var(--bg-dark);
}

/* ── App Layout ── */

#app {
  display: grid;
  grid-template-columns: var(--sidebar-left-w) 1fr var(--sidebar-right-w);
  height: 100vh;
}

@media (max-width: 768px) {
  #app {
    grid-template-columns: 1fr;
  }
}

/* ── Sidebar Overlay (always out of grid flow) ── */

#sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 15;
  backdrop-filter: blur(2px);
}

#sidebar-overlay.visible {
  display: block;
}

/* ── Sidebars ── */

#sidebar-left,
#sidebar-right {
  display: flex;
  flex-direction: column;
  background: var(--bg-panel);
  height: 100vh;
  overflow: hidden;
  z-index: 20;
}

#sidebar-left {
  border-right: 1px solid var(--border);
}

#sidebar-right {
  border-left: 1px solid var(--border);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--text);
}

.logo svg {
  color: var(--accent);
}

/* ── Theme Toggle ── */

.sidebar-header-actions {
  display: flex;
  align-items: center;
  gap: 2px;
}

#theme-toggle svg {
  transition: transform 0.3s;
}

#theme-toggle:hover svg {
  transform: rotate(30deg);
}

/* ── Language Picker ── */

.lang-picker {
  position: relative;
}

.lang-btn {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.03em;
  min-width: 28px;
}

.lang-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 4px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  z-index: 30;
  min-width: 56px;
  overflow: hidden;
}

.lang-menu.open {
  display: flex;
  flex-direction: column;
}

.lang-menu-item {
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: background 0.15s, color 0.15s;
}

.lang-menu-item:hover {
  background: var(--bg-hover);
  color: var(--text);
}

.lang-menu-item.active {
  color: var(--accent);
}

/* Dark theme: show sun icon (to switch to light) */
#theme-toggle .icon-moon { display: none; }
#theme-toggle .icon-sun  { display: block; }

/* Light theme: show moon icon (to switch to dark) */
[data-theme="light"] #theme-toggle .icon-moon { display: block; }
[data-theme="light"] #theme-toggle .icon-sun  { display: none; }

.sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--border-light) transparent;
}

.sidebar-scroll::-webkit-scrollbar {
  width: 4px;
}

.sidebar-scroll::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 2px;
}

.sidebar-footer {
  padding: 12px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-footer .icon-btn {
  width: 100%;
  justify-content: flex-start;
  gap: 8px;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--text-muted);
}

.sidebar-footer .icon-btn span {
  flex: 1;
  text-align: left;
}

.sidebar-footer kbd {
  margin-left: auto;
}

/* ── Sidebar collapse (desktop) ── */

#sidebar-left-collapse,
#sidebar-right-collapse {
  transition: transform 0.2s;
}

body.sidebar-left-collapsed #app {
  grid-template-columns: 1fr var(--sidebar-right-w);
}

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

body.sidebar-left-collapsed #menu-toggle {
  display: flex;
}

body.sidebar-right-collapsed #app {
  grid-template-columns: var(--sidebar-left-w) 1fr;
}

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

body.sidebar-right-collapsed #settings-toggle {
  display: flex;
}

body.sidebar-left-collapsed.sidebar-right-collapsed #app {
  grid-template-columns: 1fr;
}

.sidebar-header-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* ── Panel Sections ── */

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

.panel-section--models {
  border-bottom: none;
  padding-bottom: 16px;
}

.section-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 10px;
}

/* ── Toggle Rows ── */

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
  font-size: 13px;
  color: var(--text);
}

.toggle-row:hover {
  background: var(--bg-hover);
}

.toggle-row.disabled {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
}

.toggle-row input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-track {
  position: relative;
  width: 32px;
  height: 18px;
  background: var(--bg-active);
  border-radius: 9px;
  border: 1px solid var(--border-light);
  transition: background 0.2s, border-color 0.2s;
  flex-shrink: 0;
}

.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 12px;
  height: 12px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: transform 0.2s, background 0.2s;
}

.toggle-row input:checked ~ .toggle-track {
  background: var(--accent-dim);
  border-color: var(--accent);
}

.toggle-row input:checked ~ .toggle-track .toggle-thumb {
  transform: translateX(14px);
  background: var(--accent);
}

/* ── Buttons ── */

.btn-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 6px;
}

.btn-group:last-child {
  margin-bottom: 0;
}

.btn {
  padding: 7px 10px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-align: center;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  background: var(--accent);
  color: var(--accent-text);
}

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

.btn:active {
  transform: scale(0.97);
}

.btn-outline {
  background: transparent;
  border-color: var(--border-light);
  color: var(--text);
}

.btn-outline:hover {
  background: var(--bg-hover);
  border-color: var(--accent-dim);
  color: var(--accent);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: background 0.15s, color 0.15s;
}

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

/* ── Models Browser ── */

#models-list {
  position: relative;
  overflow: hidden;
}

/* View container — slides between brand grid and robot list */
.models-view {
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.2s ease;
}

/* ── Search & Filter ── */

.models-filter {
  margin-bottom: 10px;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color 0.15s;
}

.search-box:focus-within {
  border-color: var(--accent-dim);
}

.search-box svg {
  flex-shrink: 0;
  color: var(--text-dim);
}

.search-box input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 12px;
}

.search-box input::placeholder {
  color: var(--text-dim);
}

.category-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 8px;
}

.category-chip {
  padding: 3px 8px;
  font-size: 10px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-dim);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  user-select: none;
}

.category-chip:hover {
  color: var(--text-muted);
  background: var(--bg-hover);
}

.category-chip.active {
  color: var(--accent);
  border-color: var(--accent-dim);
  background: var(--accent-glow);
}

.filter-count {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-dim);
  padding: 4px 10px 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.result-name {
  display: block;
}

.result-brand {
  display: block;
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-dim);
  margin-top: 1px;
}

/* ── Brand Grid ── */

.brand-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.brand-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s, border-color 0.2s, transform 0.15s;
  user-select: none;
}

.brand-tile:hover {
  background: var(--bg-hover);
  border-color: var(--accent-dim);
  transform: translateY(-1px);
}

.brand-tile:active {
  transform: scale(0.97);
}

.brand-tile img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: 4px;
  background: var(--bg-panel);
  padding: 4px;
}

.brand-tile .brand-icon-fallback {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  background: var(--bg-panel);
  color: var(--accent);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.02em;
}

.brand-tile span {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.3;
}

.brand-tile:hover span {
  color: var(--text);
}

.brand-tile .brand-count {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-dim);
  margin-top: -4px;
}

/* ── Robot List (inside a brand) ── */

.brand-back {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  margin-bottom: 6px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  transition: background 0.15s, color 0.15s;
  font-family: var(--font-body);
}

.brand-back:hover {
  background: var(--bg-hover);
  color: var(--text);
}

.brand-back svg {
  flex-shrink: 0;
}

.brand-back img {
  width: 20px;
  height: 20px;
  object-fit: contain;
  border-radius: 3px;
  background: var(--bg-surface);
  padding: 2px;
}

.brand-back .brand-name {
  font-weight: 600;
  color: var(--text);
}

.model-list {
  list-style: none;
}

.model-list li a {
  display: block;
  padding: 7px 10px 7px 14px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  border-radius: var(--radius-sm);
  transition: background 0.15s, color 0.15s;
}

.model-list li a:hover {
  background: var(--bg-hover);
  color: var(--text);
}

.model-list li.active a {
  background: var(--accent-glow);
  color: var(--accent);
  font-weight: 500;
}

/* ── Viewport (canvas area) ── */

#viewport {
  position: relative;
  overflow: hidden;
  background: var(--bg-dark);
  min-height: 0;
  min-width: 0;
}

#canvas-container {
  position: absolute;
  inset: 0;
}

/* ── HUD ── */

#hud {
  position: absolute;
  bottom: 16px;
  right: 16px;
  display: flex;
  gap: 20px;
  pointer-events: none;
  animation: hud-in 0.4s ease-out both;
  animation-delay: 0.5s;
}

@keyframes hud-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hud-item {
  text-align: right;
}

.hud-label {
  display: block;
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: 2px;
}

.hud-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
}

@media (max-width: 768px) {
  #hud {
    gap: 12px;
    bottom: 12px;
    right: 12px;
  }

  .hud-label { font-size: 9px; }
  .hud-value { font-size: 12px; }
}

/* ── Stats.js ── */

#statsjs {
  position: absolute !important;
  left: auto !important;
  right: 0 !important;
  top: 0 !important;
}

/* ── Mobile Menu ── */

#menu-toggle {
  display: none;
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 15;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  color: var(--text);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

#menu-toggle:hover,
#settings-toggle:hover {
  background: var(--bg-hover);
}

#settings-toggle {
  display: none;
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 15;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  color: var(--text);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

@media (max-width: 768px) {
  #menu-toggle,
  #settings-toggle {
    display: flex;
  }

  #sidebar-left {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-left-w);
    transform: translateX(-100%);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  }

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

  #sidebar-right {
    position: fixed;
    top: 0;
    right: 0;
    width: var(--sidebar-right-w);
    transform: translateX(100%);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  }

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

  #sidebar-left-collapse,
  #sidebar-right-collapse {
    display: none;
  }
}

/* ── Dialogs ── */

dialog {
  position: fixed;
  inset: 0;
  margin: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0;
  background: var(--bg-panel);
  color: var(--text);
  max-width: 440px;
  width: 90%;
  max-height: 90vh;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
  animation: dialog-in 0.2s ease-out;
}

@keyframes dialog-in {
  from { opacity: 0; transform: scale(0.96) translateY(8px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.dialog-header h4 {
  font-size: 15px;
  font-weight: 600;
}

/* ── Shortcuts Table ── */

.shortcuts-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.shortcuts-table td {
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
}

.shortcuts-table tr:last-child td {
  border-bottom: none;
}

.shortcuts-table td:first-child {
  width: 48px;
  text-align: center;
}

.shortcuts-table td:last-child {
  color: var(--text-muted);
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  color: var(--text);
  line-height: 1;
}

/* ── Loader Dialog ── */

#loader-modal {
  max-width: 280px;
  text-align: center;
}

.loader-content {
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.loader-content p {
  font-size: 13px;
  color: var(--text-muted);
}

.loader-spinner {
  width: 32px;
  height: 32px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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