/* ============ CSS Custom Properties (Responsive Variables) ============ */

:root {
  /* === Color Tokens === */
  --bg-primary: #1b2838;
  --bg-secondary: #171a21;
  --bg-surface: #16202d;
  --bg-surface-light: #1e3a50;
  --bg-input: #213345;

  --accent-primary: #1a9fff;
  --accent-hover: #66c0f4;
  --accent-gradient: linear-gradient(135deg, #1a9fff, #66c0f4);
  --accent-subtle: rgba(26, 159, 255, 0.12);

  --text-primary: #c7d5e0;
  --text-secondary: #8f98a0;
  --text-bright: #ffffff;
  --text-danger: #e74c3c;
  --text-success: #2ecc71;

  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-default: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(255, 255, 255, 0.18);
  --border-focus: #1a9fff;

  --glass-bg: rgba(22, 32, 45, 0.88);
  --glass-border: rgba(255, 255, 255, 0.08);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(26, 159, 255, 0.15);

  --danger: #e74c3c;
  --danger-hover: #c0392b;
  --danger-bg: rgba(231, 76, 60, 0.1);

  --success: #2ecc71;

  /* === Phone defaults (up to 767px) === */
  --btn-size: clamp(40px, 11vw, 52px);
  --btn-padding: clamp(8px, 2.5vw, 14px);
  --btn-font: clamp(12px, 3.5vw, 14px);

  --spacing-xs: clamp(4px, 1vw, 6px);
  --spacing-sm: clamp(6px, 1.5vw, 10px);
  --spacing-md: clamp(10px, 2.5vw, 16px);
  --spacing-lg: clamp(14px, 3.5vw, 24px);

  --edge-margin: clamp(8px, 2vw, 16px);
  --modal-margin-min: 44px;
  --panel-width: clamp(200px, 60vw, 280px);

  --font-xs: clamp(10px, 2.8vw, 12px);
  --font-sm: clamp(12px, 3.2vw, 13px);
  --font-md: clamp(13px, 3.5vw, 14px);
  --font-lg: clamp(16px, 4.5vw, 20px);

  --icon-size: clamp(18px, 5vw, 22px);
  --slider-thumb: 44px;

  --radius-sm: clamp(4px, 1vw, 6px);
  --radius-md: clamp(6px, 1.5vw, 8px);
  --radius-lg: clamp(8px, 2vw, 12px);

  --tab-height: clamp(40px, 12vw, 52px);
  --tab-padding: clamp(8px, 2vw, 14px);

  --above-controls: calc(var(--tab-height) + var(--btn-size) + var(--spacing-sm) * 2 + var(--spacing-md));
}

/* === Tablet (768px - 1199px) === */
@media (min-width: 768px) {
  :root {
    --btn-size: clamp(44px, 6vw, 56px);
    --btn-padding: clamp(10px, 1.5vw, 16px);
    --btn-font: clamp(13px, 1.8vw, 15px);

    --spacing-xs: clamp(4px, 0.5vw, 8px);
    --spacing-sm: clamp(6px, 0.8vw, 12px);
    --spacing-md: clamp(12px, 1.5vw, 20px);
    --spacing-lg: clamp(16px, 2vw, 28px);

    --edge-margin: clamp(12px, 1.5vw, 20px);
    --panel-width: clamp(220px, 30vw, 300px);

    --font-xs: clamp(11px, 1.4vw, 12px);
    --font-sm: clamp(12px, 1.6vw, 14px);
    --font-md: clamp(13px, 1.8vw, 15px);
    --font-lg: clamp(18px, 2.5vw, 22px);

    --icon-size: clamp(18px, 2.5vw, 24px);
    --slider-thumb: 44px;

    --tab-height: clamp(44px, 6vw, 52px);
    --tab-padding: clamp(10px, 1.2vw, 16px);
  }
}

/* === Desktop (1200px+) === */
@media (min-width: 1200px) {
  :root {
    --btn-size: clamp(44px, 3.5vw, 60px);
    --btn-padding: clamp(12px, 1vw, 18px);
    --btn-font: clamp(14px, 1vw, 16px);

    --spacing-xs: clamp(4px, 0.3vw, 8px);
    --spacing-sm: clamp(8px, 0.5vw, 12px);
    --spacing-md: clamp(12px, 0.8vw, 20px);
    --spacing-lg: clamp(16px, 1.2vw, 32px);

    --edge-margin: clamp(16px, 1vw, 24px);
    --panel-width: clamp(240px, 18vw, 320px);

    --font-xs: 12px;
    --font-sm: 13px;
    --font-md: 14px;
    --font-lg: 20px;

    --icon-size: clamp(20px, 1.5vw, 24px);
    --slider-thumb: 44px;

    --tab-height: clamp(44px, 3.5vw, 56px);
    --tab-padding: clamp(12px, 0.8vw, 18px);
  }
}

/* ============ Base Styles ============ */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  overflow: hidden;
  width: 100vw;
  height: 100dvh;
  background: var(--bg-primary);
  color: var(--text-primary);
}

#background-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--bg-primary);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  z-index: 0;
}

#canvas-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  touch-action: none;
}

#canvas-container canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* ============ Controls Bar (above room tabs) ============ */

#controls-bar {
  position: fixed;
  bottom: var(--tab-height);
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--glass-border);
  z-index: 100;
}

.controls-left,
.controls-right {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

#controls-bar.two-row .controls-left {
  display: grid;
  grid-template-columns: repeat(var(--controls-cols, 4), auto);
  gap: var(--spacing-sm);
}

#controls-bar button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--btn-padding);
  min-height: var(--btn-size);
  min-width: var(--btn-size);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-size: var(--btn-font);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

#controls-bar button svg {
  width: var(--icon-size);
  height: var(--icon-size);
}

#controls-bar button:hover:not(:disabled) {
  background: var(--bg-surface-light);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
}

#controls-bar button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

#controls-bar button.active {
  background: var(--accent-primary);
  color: var(--text-bright);
  border-color: var(--accent-primary);
}


/* ============ Button Variants ============ */

.btn-primary,
.btn-secondary,
.btn-danger {
  padding: var(--btn-padding) var(--spacing-lg);
  min-height: var(--btn-size);
  border-radius: var(--radius-sm);
  font-size: var(--font-md);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--accent-gradient) !important;
  color: var(--text-bright) !important;
  border: none !important;
}

.btn-primary:hover {
  filter: brightness(1.15);
  box-shadow: var(--shadow-glow) !important;
}

.btn-secondary {
  background: var(--bg-surface) !important;
  color: var(--text-primary) !important;
  border: 1px solid var(--border-default) !important;
}

.btn-secondary:hover {
  background: var(--bg-surface-light) !important;
  border-color: var(--border-hover) !important;
}

.btn-danger {
  background: var(--danger) !important;
  color: var(--text-bright) !important;
  border: none !important;
}

.btn-danger:hover {
  background: var(--danger-hover) !important;
}

/* Full-width standalone buttons in entry editor */
#generate-model-btn {
  width: 100%;
}

/* ============ Gizmo Menu ============ */

.gizmo-menu {
  position: fixed;
  display: flex;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  z-index: 200;
  transform: translate(-50%, -100%);
  margin-top: -12px;
}

.gizmo-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--btn-size);
  height: var(--btn-size);
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.15s;
}

.gizmo-btn svg {
  width: var(--icon-size);
  height: var(--icon-size);
}

.gizmo-btn:hover {
  background: var(--bg-surface-light);
}

.gizmo-btn.danger:hover {
  background: var(--danger-bg);
  color: var(--danger);
}

/* ============ Popup Menu ============ */

.popup-menu {
  position: fixed;
  display: flex;
  flex-direction: column;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  z-index: 600;
  overflow: hidden;
  min-width: 120px;
}

.popup-menu button {
  padding: var(--spacing-md) var(--spacing-lg);
  min-height: var(--btn-size);
  border: none;
  background: transparent;
  text-align: left;
  font-size: var(--font-md);
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.15s;
}

.popup-menu button:hover {
  background: var(--bg-surface-light);
}

.popup-menu button.danger {
  color: var(--danger);
}

.popup-menu button.danger:hover {
  background: var(--danger-bg);
}

.popup-menu button.disabled,
.popup-menu button:disabled {
  color: var(--text-secondary);
  cursor: not-allowed;
}

.popup-menu button.disabled:hover,
.popup-menu button:disabled:hover {
  background: transparent;
}

/* ============ Error Popup ============ */

.error-popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  text-align: center;
  max-width: min(400px, 90vw);
}

.error-popup p {
  margin-bottom: var(--spacing-md);
  color: var(--danger);
  font-size: var(--font-md);
}

.error-popup button {
  padding: var(--btn-padding) var(--spacing-lg);
  min-height: var(--btn-size);
  border: none;
  border-radius: var(--radius-sm);
  background: var(--accent-gradient);
  color: var(--text-bright);
  font-size: var(--font-md);
  cursor: pointer;
}

/* ============ Form Elements ============ */

input[type="text"],
input[type="search"],
input[type="password"],
input[type="number"],
select,
textarea {
  padding: var(--spacing-sm) var(--spacing-md);
  min-height: var(--btn-size);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  font-size: var(--font-md);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  background: var(--bg-input);
  color: var(--text-primary);
  font-family: inherit;
}

textarea {
  resize: none;
}

input[type="text"]:focus,
input[type="search"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px var(--accent-subtle);
}

input[type="text"]::placeholder,
input[type="search"]::placeholder,
input[type="password"]::placeholder,
input[type="number"]::placeholder,
textarea::placeholder {
  color: var(--text-secondary);
}

select option {
  background: var(--bg-surface);
  color: var(--text-primary);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-md);
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group select,
.form-group textarea {
  width: 100%;
}

.form-row {
  display: flex;
  gap: var(--spacing-md);
}

.form-row .form-group {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.form-row .form-group > *:last-child:not(label) {
  flex: 1;
}

.form-group-narrow {
  flex: 0 0 80px !important;
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-subtle);
}

.form-actions button {
  padding: var(--btn-padding) var(--spacing-lg);
  min-height: var(--btn-size);
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-md);
  font-weight: 500;
  cursor: pointer;
}

/* ============ Upload Preview ============ */

.upload-preview {
  width: 100%;
  height: clamp(100px, 25vw, 140px);
  border: 2px dashed var(--border-default);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-sm);
  background: var(--bg-input);
  overflow: hidden;
}

.upload-preview img,
.upload-preview canvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.upload-preview span {
  color: var(--text-secondary);
  font-size: var(--font-sm);
}

/* ============ Tags ============ */

#entry-tags-container {
  position: relative;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm);
  min-height: var(--btn-size);
  background: var(--bg-input);
}

#entry-tags-container:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px var(--accent-subtle);
}

#entry-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-xs);
}

#entry-tags-list:empty {
  margin-bottom: 0;
}

.entry-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  min-height: calc(var(--btn-size) * 0.7);
  background: var(--bg-surface-light);
  border-radius: var(--radius-sm);
  font-size: var(--font-xs);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.15s;
}

.entry-tag:hover {
  background: var(--danger-bg);
}

.entry-tag-text {
  margin-right: var(--spacing-xs);
}

.entry-tag-remove {
  display: none;
  color: var(--danger);
  font-weight: bold;
  font-size: var(--font-md);
  line-height: 1;
}

.entry-tag:hover .entry-tag-remove {
  display: inline;
}

.entry-tag:hover .entry-tag-text {
  color: var(--danger);
}

#entry-tag-input {
  border: none;
  outline: none;
  padding: var(--spacing-xs);
  font-size: var(--font-md);
  width: 100%;
  background: transparent;
  color: var(--text-primary);
}

#entry-tag-input::placeholder {
  color: var(--text-secondary);
}

/* Tag dropdown */
.tag-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  max-height: 180px;
  overflow-y: auto;
  z-index: 100;
  margin-top: var(--spacing-xs);
}

.tag-dropdown.hidden {
  display: none;
}

.tag-dropdown-item {
  padding: var(--spacing-sm) var(--spacing-md);
  min-height: var(--btn-size);
  display: flex;
  align-items: center;
  cursor: pointer;
  font-size: var(--font-md);
  color: var(--text-primary);
  transition: background 0.15s;
}

.tag-dropdown-item:hover {
  background: var(--bg-surface-light);
}

.tag-dropdown-item.create-new {
  color: var(--accent-primary);
  font-style: italic;
}

.tag-dropdown-empty {
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-secondary);
  font-size: var(--font-sm);
  text-align: center;
}

/* Dropdown input container */
.dropdown-input-container {
  position: relative;
  flex: 1;
}

.dropdown-input-container input[type="text"] {
  width: 100%;
  height: 100%;
}

/* ============ Dimension Inputs ============ */

.dimension-inputs {
  display: flex;
  gap: var(--spacing-sm);
}

.dimension-field {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.dimension-field label {
  font-size: var(--font-xs);
  color: var(--text-secondary);
  font-weight: normal;
}

.dimension-field input {
  width: 100%;
}

.dimension-field input.invalid {
  border-color: var(--danger);
  background: rgba(231, 76, 60, 0.08);
}

.dimension-error {
  color: var(--danger);
  font-size: var(--font-xs);
  margin-top: var(--spacing-sm);
}

/* ============ Help Icon ============ */

.help-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: calc(var(--btn-size) * 0.65);
  height: calc(var(--btn-size) * 0.65);
  border-radius: 50%;
  border: 1px solid var(--border-default);
  background: transparent;
  color: var(--text-secondary);
  font-size: var(--font-sm);
  font-weight: bold;
  cursor: pointer;
  margin-left: var(--spacing-xs);
  vertical-align: middle;
  padding: 0;
  line-height: 1;
}

.help-icon:hover {
  background: var(--bg-surface-light);
  border-color: var(--border-hover);
}

/* Help popup */
.help-popup {
  position: fixed;
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-md);
  max-width: min(320px, 90vw);
  z-index: 700;
}

.help-popup h4 {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: var(--font-md);
  color: var(--text-bright);
}

.help-popup ul {
  margin: 0;
  padding-left: 20px;
  font-size: var(--font-sm);
  line-height: 1.6;
  color: var(--text-primary);
}

.help-popup li {
  margin-bottom: var(--spacing-xs);
}

.help-popup p {
  margin: var(--spacing-sm) 0 0 0;
  font-size: var(--font-xs);
  color: var(--text-secondary);
}

/* ============ Room Tab Bar ============ */

.room-tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--tab-height);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-sm);
  z-index: 100;
  gap: var(--spacing-xs);
}

.room-tabs-container {
  display: flex;
  gap: var(--spacing-xs);
  overflow-x: auto;
  flex: 1;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-surface-light) transparent;
}

.room-tab {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--tab-padding);
  min-height: calc(var(--tab-height) - 8px);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-bottom: none;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  font-size: var(--font-sm);
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
}

.room-tab:hover {
  background: var(--bg-surface-light);
  color: var(--text-primary);
}

.room-tab.active {
  background: var(--accent-primary);
  color: var(--text-bright);
  border-color: var(--accent-primary);
}

.room-tab-close {
  display: none;
  width: 16px;
  height: 16px;
  border: none;
  background: transparent;
  color: inherit;
  cursor: pointer;
  padding: 0;
  font-size: var(--font-md);
  line-height: 1;
  opacity: 0.7;
}

.room-tab:hover .room-tab-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.room-tab-close:hover {
  opacity: 1;
}

.add-room-tab-btn {
  width: var(--btn-size);
  height: var(--btn-size);
  border: 1px dashed var(--border-default);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-size: var(--font-lg);
  cursor: pointer;
  flex-shrink: 0;
}

.add-room-tab-btn:hover {
  background: var(--bg-surface);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* ============ Modal Description ============ */

.modal-description {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-md);
}

/* ============ Legacy Notice ============ */

.legacy-notice {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-subtle);
  font-size: var(--font-sm);
  color: var(--text-secondary);
}

.legacy-notice p {
  margin: 0;
}

.btn-link {
  background: none;
  border: none;
  color: var(--accent-primary);
  cursor: pointer;
  text-decoration: underline;
  font-size: inherit;
  padding: 0;
}

.btn-link:hover {
  color: var(--accent-hover);
}

/* ============ Utility Classes ============ */

.modal-hidden {
  display: none !important;
}

.hidden {
  display: none !important;
}

/* ============ Lighting Panel ============ */

.lighting-panel {
  position: fixed;
  bottom: var(--above-controls);
  left: var(--edge-margin);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-md);
  z-index: 100;
  width: var(--panel-width);
  max-width: calc(100vw - var(--edge-margin) * 2);
  pointer-events: none;
}

.lighting-panel > * {
  pointer-events: auto;
}

.lighting-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  font-weight: 500;
  font-size: var(--font-md);
  color: var(--text-bright);
}

.lighting-close-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: calc(var(--btn-size) * 0.75);
  height: calc(var(--btn-size) * 0.75);
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-lg);
  cursor: pointer;
  color: var(--text-secondary);
  padding: 0;
  line-height: 1;
}

.lighting-close-btn:hover {
  background: var(--bg-surface-light);
  color: var(--text-primary);
}

.lighting-slider-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.lighting-slider-row label {
  font-size: var(--font-sm);
  color: var(--text-secondary);
  min-width: 55px;
}

.lighting-slider-row input[type="range"] {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg-surface-light);
  border-radius: 2px;
  outline: none;
}

.lighting-slider-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: var(--slider-thumb);
  height: var(--slider-thumb);
  border-radius: 50%;
  background: var(--accent-gradient);
  cursor: pointer;
  box-shadow: 0 0 8px rgba(26, 159, 255, 0.3);
}

.lighting-slider-row input[type="range"]::-moz-range-thumb {
  width: var(--slider-thumb);
  height: var(--slider-thumb);
  border-radius: 50%;
  background: var(--accent-primary);
  cursor: pointer;
  border: none;
  box-shadow: 0 0 8px rgba(26, 159, 255, 0.3);
}

.lighting-slider-row span {
  font-size: var(--font-xs);
  color: var(--text-secondary);
  min-width: 28px;
  text-align: right;
}

.lighting-direction-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-sm);
}

.lighting-direction-row button {
  padding: var(--btn-padding);
  min-height: calc(var(--btn-size) * 0.85);
  font-size: var(--font-sm);
  border-radius: var(--radius-sm);
}

.lighting-direction-row button.active {
  background: var(--accent-primary) !important;
  color: var(--text-bright) !important;
}

#lighting-direction-status {
  font-size: var(--font-xs);
  color: var(--text-secondary);
}

#meter-stick-btn.placement-mode {
  animation: placementPulse 1.5s ease-in-out infinite;
  border-color: var(--accent-primary);
}

@keyframes placementPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(26, 159, 255, 0.4); }
  50% { box-shadow: 0 0 12px 4px rgba(26, 159, 255, 0.4); }
}

#lighting-btn.active,
#scale-btn.active,
#before-after-btn.active {
  background: var(--accent-primary);
  color: var(--text-bright);
  border-color: var(--accent-primary);
}

/* ============ Action Notification ============ */

.action-notification {
  position: fixed;
  bottom: var(--above-controls);
  left: var(--edge-margin);
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  z-index: 10001;
  color: var(--text-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-sm);
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: none;
  max-width: clamp(200px, 40vw, 300px);
}

.action-notification.visible {
  opacity: 1;
  transform: translateX(0);
}

.action-notification.hidden {
  display: none;
}

/* ============ Auth Page ============ */

.auth-overlay {
  background: linear-gradient(135deg, #171a21 0%, #1b2838 50%, #1e3a50 100%);
  display: flex;
  justify-content: center;
  align-items: center;
}

.auth-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-lg) var(--spacing-lg);
  width: min(400px, calc(100vw - var(--modal-margin-min) * 2));
}

.auth-card h2 {
  font-size: var(--font-lg);
  color: var(--text-bright);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.auth-card .form-actions {
  border-top: none;
  justify-content: center;
}

.auth-card .form-actions .btn-primary {
  width: 100%;
  padding: var(--btn-padding) var(--spacing-lg);
  font-size: var(--font-md);
}

.auth-toggle {
  text-align: center;
  margin-top: var(--spacing-lg);
}

.auth-toggle a {
  color: var(--accent-primary);
  text-decoration: none;
  font-size: var(--font-sm);
}

.auth-toggle a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* ============ Auth Help Button ============ */

.auth-help-btn {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
  z-index: 10000;
}

.auth-help-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--text-bright);
}

/* ============ Impersonation Banner ============ */

.impersonation-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 36px;
  background: var(--accent-primary);
  color: var(--text-bright);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  font-size: var(--font-sm);
  z-index: 9999;
}

.impersonation-banner.hidden {
  display: none;
}

.impersonation-exit-btn {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--text-bright);
  padding: 2px var(--spacing-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-xs);
}

.impersonation-exit-btn:hover {
  background: rgba(0, 0, 0, 0.5);
}

/* ============ Demo Mode ============ */

.demo-badge {
  position: fixed;
  top: var(--spacing-sm);
  left: var(--spacing-sm);
  background: rgba(255, 165, 0, 0.2);
  border: 1px solid rgba(255, 165, 0, 0.4);
  color: #ffa500;
  padding: 2px var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-xs);
  font-weight: 600;
  z-index: 9998;
  letter-spacing: 1px;
}

.demo-badge.hidden {
  display: none;
}

.demo-mode #add-room-tab {
  opacity: 0.4;
  pointer-events: none;
}

/* ============ Tutorial License Link ============ */

.tutorial-license-link {
  display: block;
  text-align: center;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: var(--font-sm);
  text-decoration: none;
}

.tutorial-license-link:hover {
  color: var(--accent-primary);
  text-decoration: underline;
}

/* ============ License Page ============ */

.license-page {
  min-height: 100dvh;
  display: flex;
  justify-content: center;
  padding: var(--spacing-lg);
  background: var(--bg-primary);
}

.license-content {
  max-width: 700px;
  width: 100%;
}

/* ============ Layouts Panel ============ */

.layouts-panel {
  position: fixed;
  bottom: var(--above-controls);
  left: 50%;
  transform: translateX(-50%);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-md);
  z-index: 100;
  max-width: 90vw;
  max-height: 50vh;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.layouts-panel.hidden {
  display: none;
}

.layouts-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
  font-size: var(--font-md);
  color: var(--text-bright);
}

.layouts-count {
  color: var(--text-secondary);
  font-weight: 400;
  font-size: var(--font-xs);
  margin-left: var(--spacing-xs);
}

.layouts-container {
  display: flex;
  gap: var(--spacing-sm);
  overflow-x: auto;
  overflow-y: hidden;
  padding: var(--spacing-xs) 0;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-surface-light) transparent;
}

@media (max-width: 500px) {
  .layouts-container {
    flex-direction: column;
    overflow-x: hidden;
    overflow-y: auto;
    max-height: 35vh;
  }
}

.layout-card {
  flex-shrink: 0;
  width: var(--card-size, clamp(120px, 28vw, 150px));
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
}

.layout-card:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.layout-card-thumbnail {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  background: var(--bg-surface);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.layout-card-name {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-xs);
  font-weight: 500;
  color: var(--text-primary);
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.layout-card-delete {
  position: absolute;
  top: var(--spacing-xs);
  right: var(--spacing-xs);
  width: calc(var(--btn-size) * 0.5);
  height: calc(var(--btn-size) * 0.5);
  min-width: 22px;
  min-height: 22px;
  background: rgba(0, 0, 0, 0.6);
  border: none;
  border-radius: 50%;
  color: var(--text-secondary);
  font-size: var(--font-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.15s;
}

.layout-card:hover .layout-card-delete {
  opacity: 1;
}

.layout-card-delete:hover {
  color: var(--text-danger);
  background: rgba(0, 0, 0, 0.8);
}

.layouts-panel-footer {
  display: flex;
  justify-content: center;
}

.layouts-empty {
  color: var(--text-secondary);
  font-size: var(--font-sm);
  text-align: center;
  padding: var(--spacing-md) var(--spacing-lg);
}

/* Layout missing furniture list */
.layout-missing-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--spacing-lg) 0;
}

.layout-missing-list li {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-sm);
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-subtle);
}

.layout-missing-list li:last-child {
  border-bottom: none;
}

/* ============ Wall Color Panel ============ */

.wall-color-panel {
  position: fixed;
  bottom: var(--above-controls, 120px);
  left: var(--spacing-md);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur-heavy));
  -webkit-backdrop-filter: blur(var(--blur-heavy));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  z-index: 100;
  width: min(320px, calc(100vw - var(--spacing-md) * 2));
}

.wall-color-panel.hidden {
  display: none;
}

.wall-color-panel-header {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-sm);
  color: var(--text-bright);
  font-size: var(--font-md);
  font-weight: 500;
}

.wall-color-panel-header > span:first-child {
  flex: 1;
}

.wall-color-presets {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.color-swatch {
  width: 100%;
  aspect-ratio: 1;
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  cursor: pointer;
  min-height: 36px;
  transition: border-color 0.15s, transform 0.1s;
}

.color-swatch:hover {
  border-color: var(--accent);
  transform: scale(1.1);
}

.color-swatch.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent);
}

.wall-color-edit-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: var(--font-md);
  cursor: pointer;
  padding: 2px 6px;
  margin-left: auto;
  margin-right: var(--spacing-xs);
  transition: color 0.15s;
}

.wall-color-edit-btn:hover {
  color: var(--accent);
}

.wall-color-custom {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
  align-items: center;
}

.wall-color-pick-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  flex: 1;
  min-width: 0;
  cursor: pointer;
  padding: var(--spacing-xs);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: var(--surface-dark);
  transition: border-color 0.15s;
}

.wall-color-pick-btn:hover {
  border-color: var(--accent);
}

.wall-color-swatch {
  width: 28px;
  height: 28px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.wall-color-name-display {
  flex: 1;
  min-width: 0;
  color: var(--text-secondary);
  font-size: var(--font-sm);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.wall-color-name-display:empty::before {
  content: 'Tap to pick color';
  color: var(--text-muted);
}

.wall-color-gallery {
  display: flex;
  gap: var(--spacing-xs);
  overflow-x: auto;
  padding: var(--spacing-xs) 0;
}

.wall-color-card {
  flex-shrink: 0;
  width: 70px;
  padding: var(--spacing-xs);
  background: var(--surface-dark);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: center;
  position: relative;
  transition: border-color 0.15s;
}

.wall-color-card.active {
  border-color: var(--accent);
}

.wall-color-card:hover {
  border-color: var(--text-secondary);
}

.wall-color-split {
  display: flex;
  padding: 0;
  overflow: hidden;
  width: auto;
}

.wall-color-split-half {
  padding: var(--spacing-xs);
  cursor: pointer;
  text-align: center;
  min-width: 50px;
  transition: background 0.15s;
}

.wall-color-split-half:first-child {
  border-right: 1px solid var(--border-subtle);
}

.wall-color-split-half:hover {
  background: var(--surface-hover, rgba(255,255,255,0.05));
}

.wall-color-split-half.active {
  background: var(--accent-muted, rgba(99,146,234,0.15));
}

.wall-color-label {
  font-size: 0.7rem;
  color: var(--text-secondary);
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.wall-color-delete {
  position: absolute;
  top: 2px;
  right: 2px;
  background: rgba(0, 0, 0, 0.6);
  border: none;
  color: var(--text-secondary);
  font-size: 0.8rem;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.15s;
}

.wall-color-card:hover .wall-color-delete {
  opacity: 1;
}

.wall-color-delete:hover {
  color: var(--text-danger);
  background: rgba(0, 0, 0, 0.8);
}

.wall-color-card.generating {
  cursor: default;
  opacity: 0.7;
}

.wall-color-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--border-subtle);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto var(--spacing-xs);
}

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