/* ── MJE Part Shop v4 ── */
/* Font loaded via preload in index.html */

:root {
  --accent: #6C5CE7;
  --accent-light: #a29bfe;
  --accent-dark: #5541d6;
  --accent-glow: rgba(108, 92, 231, 0.12);
  --bg: #f8f9fc;
  --topbar-bg: #ffffff;
  --topbar-height: 48px;
  --panel-bg: rgba(255, 255, 255, 0.97);
  --panel-width: 260px;
  --sidebar-width: 172px;
  --glass-bg: rgba(255, 255, 255, 0.78);
  --glass-border: rgba(255, 255, 255, 0.5);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.10);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.14);
  --radius: 12px;
  --radius-sm: 8px;
  --text: #2d3436;
  --text-muted: #636e72;
  --text-light: #b2bec3;
  --border: #e9ecef;
  --danger: #e74c3c;
  --success: #00b894;
  --warning: #fdcb6e;
}

/* ── Dark Mode Overrides ── */
[data-theme="dark"] {
  --accent: #a29bfe;
  --accent-light: #6C5CE7;
  --accent-dark: #b8b0ff;
  --accent-glow: rgba(162, 155, 254, 0.15);
  --bg: #1a1a2e;
  --topbar-bg: #16213e;
  --panel-bg: rgba(22, 33, 62, 0.97);
  --glass-bg: rgba(22, 33, 62, 0.85);
  --glass-border: rgba(255, 255, 255, 0.1);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.4);
  --text: #e0e0e0;
  --text-muted: #a0a0a0;
  --text-light: #666;
  --border: #2a2a4a;
  --danger: #ff6b6b;
  --success: #00d2a0;
}

/* ── Access Gate ── */
#access-gate {
  position: fixed;
  inset: 0;
  z-index: 50000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #6C5CE7 0%, #a29bfe 50%, #00b894 100%);
  font-family: 'Nunito', sans-serif;
}

#access-gate.hidden { display: none; }

.gate-card {
  background: white;
  border-radius: 20px;
  padding: 40px 36px;
  max-width: 380px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
  text-align: center;
}

.gate-logo {
  font-size: 28px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 4px;
}

.gate-logo span {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  vertical-align: super;
}

.gate-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 28px;
}

.gate-school {
  font-size: 13px;
  font-weight: 700;
  color: var(--success);
  margin-bottom: 8px;
  min-height: 20px;
}

#gate-form label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  text-align: left;
}

#gate-code {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border);
  border-radius: 10px;
  font-family: 'Nunito', sans-serif;
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 2px;
  text-transform: uppercase;
  outline: none;
  transition: border-color 0.2s;
  box-sizing: border-box;
}

#gate-code:focus {
  border-color: var(--accent);
}

#gate-error {
  color: var(--danger);
  font-size: 12px;
  font-weight: 700;
  min-height: 20px;
  margin: 8px 0;
}

#gate-submit {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: white;
  font-family: 'Nunito', sans-serif;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

#gate-submit:hover { background: var(--accent-dark); }
#gate-submit:active { transform: scale(0.98); }
#gate-submit:disabled { opacity: 0.6; cursor: not-allowed; }

.gate-footer {
  margin-top: 20px;
  font-size: 12px;
  color: var(--text-light);
  font-weight: 600;
}

/* Dark mode — shape palette buttons */
[data-theme="dark"] #shape-dock .shape-btn {
  background: #1e2a4a;
  border-color: rgba(255, 255, 255, 0.08);
}

/* Dark mode — shape tabs */
[data-theme="dark"] .shape-tabs {
  background: #1a1a2e;
}
[data-theme="dark"] .shape-tab.active {
  background: #2a2a4a;
}

/* Dark mode — input fields */
[data-theme="dark"] .dim-row input,
[data-theme="dark"] .prop-name-input,
[data-theme="dark"] .shelf-dim-row input {
  background: #1e2a4a;
  color: #e0e0e0;
  border-color: #2a2a4a;
}

/* Dark mode — select fields */
[data-theme="dark"] .faceops-row select {
  background: #1e2a4a;
  color: #e0e0e0;
}

/* Dark mode — toggle groups */
[data-theme="dark"] .faceops-toggle {
  background: #1a1a2e;
}
[data-theme="dark"] .fo-toggle.active {
  background: #2a2a4a;
}

/* Dark mode — active tool button states */
[data-theme="dark"] .tool-btn.active {
  background: rgba(108, 92, 231, 0.2);
}
[data-theme="dark"] .tool-btn.danger:hover {
  background: rgba(255, 107, 107, 0.15);
  border-color: rgba(255, 107, 107, 0.3);
}
[data-theme="dark"] #btn-snap.active {
  background: rgba(0, 210, 160, 0.15);
}

/* Dark mode — topbar button hover */
[data-theme="dark"] #topbar button:hover {
  background: rgba(162, 155, 254, 0.15);
}

/* Dark mode — viewport container gradient */
[data-theme="dark"] #viewport-container {
  background: linear-gradient(180deg, #1a1a2e 0%, #0f0f23 100%);
}

/* Dark mode — shelf & popup backgrounds */
[data-theme="dark"] .shelf-btn-secondary {
  background: #1e2a4a;
  color: #a0a0a0;
}
[data-theme="dark"] .shelf-comp-item {
  background: #1e2a4a;
}

/* Dark mode — range slider track */
[data-theme="dark"] input[type="range"] {
  background: #2a2a4a;
}

/* Dark mode — scrollbar */
[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: #3a3a5a;
}
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: #4a4a6a;
}

/* Dark mode — color swatch active border */
[data-theme="dark"] .color-swatch.active {
  box-shadow: 0 0 0 2px #1a1a2e, 0 0 0 3.5px var(--accent);
}

/* Dark mode — face ops hover */
[data-theme="dark"] .fo-shape-item:hover,
[data-theme="dark"] .fo-shape-item.fo-selected {
  background: rgba(162, 155, 254, 0.15) !important;
}

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

html, body {
  height: 100%;
  height: 100dvh; /* iOS-safe: excludes dynamic browser chrome */
  overflow: hidden;
  font-family: 'Nunito', sans-serif;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* ── App Layout ── */
#app {
  display: grid;
  grid-template-rows: var(--topbar-height) 1fr;
  grid-template-columns: var(--sidebar-width) 1fr var(--panel-width);
  width: 100vw;
  height: 100vh;
  height: 100dvh; /* iOS-safe: excludes URL bar */
}

#topbar { grid-column: 1 / -1; }

/* ── Left Tools ── */
#left-tools {
  grid-row: 2;
  background: var(--topbar-bg);
  border-right: 1px solid var(--border);
  padding: 10px 6px;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  scrollbar-width: thin;
  scrollbar-color: var(--accent-light) transparent;
  /* Fade hint at bottom when scrollable */
  mask-image: linear-gradient(to bottom, black 90%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, black 90%, transparent 100%);
  gap: 2px;
}

.tool-section {
  margin-bottom: 4px;
}

.tool-section:last-child {
  margin-bottom: 0;
}

.tool-label {
  font-size: 9px;
  font-weight: 800;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 6px 10px 3px;
  margin-bottom: 1px;
}

.tool-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 6px 10px;
  background: none;
  border: 1.5px solid transparent;
  border-radius: 6px;
  font-family: inherit;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  transition: all 0.12s ease;
  line-height: 1.3;
}

.tool-btn:hover {
  background: var(--accent-glow);
  border-color: rgba(108, 92, 231, 0.2);
  color: var(--accent-dark);
}

.tool-btn.active {
  background: #ede9fe;
  border-color: var(--accent);
  color: var(--accent);
}

.tool-btn.danger { color: var(--danger); }
.tool-btn.danger:hover { background: #ffeaea; border-color: #fecaca; }

.tool-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.tool-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

#btn-snap.active {
  background: #e6ffe6;
  border-color: var(--success);
  color: var(--success);
}

/* ── Shape Outliner ── */
#outliner {
  border-top: 1px solid var(--border);
  padding-top: 6px;
}

.outliner-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px 3px;
}

.outliner-title {
  font-size: 9px;
  font-weight: 800;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.outliner-count {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-light);
  background: var(--border);
  border-radius: 8px;
  padding: 1px 7px;
  min-width: 20px;
  text-align: center;
}

.outliner-list {
  max-height: 160px;
  overflow-y: auto;
  padding: 2px 4px;
}

.outliner-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.1s;
  font-size: 11px;
  font-weight: 600;
  color: var(--text);
}

.outliner-item:hover {
  background: var(--accent-glow);
}

.outliner-item.selected {
  background: #ede9fe;
  color: var(--accent);
}

.outliner-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  border: 1px solid rgba(0,0,0,0.1);
}

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

.outliner-type {
  font-size: 9px;
  font-weight: 700;
  color: var(--text-light);
  text-transform: uppercase;
}

/* ── Top Bar ── */
#topbar {
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 14px;
  background: var(--topbar-bg);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  flex-shrink: 0;
}

#topbar .logo {
  font-weight: 800;
  font-size: 17px;
  color: var(--accent);
  margin-right: 16px;
  user-select: none;
  letter-spacing: -0.3px;
}

#topbar .logo span {
  font-weight: 600;
  font-size: 11px;
  color: var(--text-muted);
  vertical-align: super;
}

#topbar .spacer {
  flex: 1;
}

#topbar button {
  width: 34px;
  height: 34px;
  border: none;
  border-radius: 6px;
  background: transparent;
  font-size: 17px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.12s, transform 0.1s;
  color: var(--text);
}

#topbar button:hover {
  background: #f0ecff;
  transform: scale(1.05);
}

#topbar button:active {
  transform: scale(0.96);
}

#topbar button:disabled {
  opacity: 0.3;
  cursor: default;
  transform: none;
}

#topbar #btn-shortcuts {
  width: 34px;
  font-size: 15px;
  font-weight: 800;
  font-weight: 700;
  font-family: 'Nunito', sans-serif;
}

#topbar #btn-shortcuts {
  font-size: 15px;
  font-weight: 800;
  width: 34px;
}

/* ── Viewport ── */
#viewport-container {
  grid-row: 2;
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, #dfe6e9 0%, #b2bec3 100%);
}

#viewport {
  display: block;
  width: 100%;
  height: 100%;
}

/* ── Viewport Navigation Hints ── */
#viewport-hints {
  position: absolute;
  bottom: 68px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 5px 14px;
  font-family: 'Nunito', sans-serif;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  pointer-events: none;
  z-index: 40;
  white-space: nowrap;
  opacity: 0.8;
  transition: opacity 0.3s;
}

/* ── Export Dropdown ── */
.dropdown {
  position: relative;
  display: inline-block;
}

#topbar .dropdown button:first-child {
  width: auto;
  padding: 0 8px;
  font-size: 12px;
  gap: 2px;
}

#topbar .dropdown .dropdown-content {
  right: 0;
  left: auto;
}

.dropdown-content {
  display: none;
  position: absolute;
  right: 0;
  top: 100%;
  background: var(--panel-bg);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  min-width: 180px;
  z-index: 1000;
  border: 1px solid var(--border);
  overflow: hidden;
}

.dropdown:hover .dropdown-content,
.dropdown:focus-within .dropdown-content,
.dropdown.open .dropdown-content {
  display: block;
}

.dropdown-content button {
  display: block !important;
  width: 100% !important;
  height: auto !important;
  padding: 10px 16px !important;
  border: none !important;
  border-radius: 0 !important;
  background: none !important;
  text-align: left !important;
  font-family: 'Nunito', sans-serif !important;
  font-size: 13px !important;
  font-weight: 600 !important;
  color: var(--text) !important;
  cursor: pointer;
  transition: background 0.12s;
  justify-content: flex-start;
  white-space: nowrap;
}

.dropdown-content button:hover {
  background: var(--accent-glow) !important;
  color: var(--accent) !important;
  transform: none !important;
}


/* ── View Cube ── */
#view-cube {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 120px;
  height: 120px;
  z-index: 50;
  pointer-events: auto;
  border-radius: 8px;
  overflow: hidden;
}

#view-cube canvas {
  display: block;
}

/* ── Empty State ── */
#empty-state {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-muted);
  pointer-events: none;
  text-align: center;
  opacity: 0.6;
  transition: opacity 0.3s;
}

#empty-state.hidden {
  opacity: 0;
  pointer-events: none;
}

/* ── Shape Dock ── */
#shape-dock {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px 12px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  z-index: 50;
  max-width: 90vw;
}

/* Category tabs */
.shape-tabs {
  display: flex;
  gap: 2px;
  background: #f0f0f4;
  border-radius: 6px;
  padding: 2px;
}

.shape-tab {
  flex: 1;
  padding: 4px 8px;
  border: none;
  border-radius: 5px;
  background: transparent;
  color: var(--text-muted);
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 10px;
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
  white-space: nowrap;
}

.shape-tab.active {
  background: white;
  color: var(--accent);
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.shape-tab:hover:not(.active) {
  color: var(--text);
}

/* Shape grid */
.shape-grid {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}

.shape-empty {
  font-size: 11px;
  color: var(--text-light);
  padding: 8px 16px;
  text-align: center;
  font-weight: 600;
}

#shape-dock .shape-btn {
  width: 58px;
  height: 58px;
  border: 1.5px solid transparent;
  border-radius: var(--radius-sm);
  background: white;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  transition: border-color 0.12s, transform 0.12s, box-shadow 0.12s;
  font-family: 'Nunito', sans-serif;
  position: relative;
}

#shape-dock .shape-btn:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(108, 92, 231, 0.15);
}

#shape-dock .shape-btn:active {
  transform: translateY(0) scale(0.96);
}

#shape-dock .shape-btn .icon {
  font-size: 19px;
  line-height: 1;
}

#shape-dock .shape-btn .shape-preview {
  width: 28px;
  height: 28px;
  pointer-events: none;
}

#shape-dock .shape-btn .label {
  font-size: 8px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

/* Favorite star on shape buttons */
.fav-star {
  position: absolute;
  top: 2px;
  right: 2px;
  font-size: 10px;
  color: var(--text-light);
  cursor: pointer;
  line-height: 1;
  transition: color 0.12s, transform 0.12s;
}

.fav-star:hover {
  color: var(--accent);
  transform: scale(1.3);
}

.fav-star.active {
  color: #fdcb6e;
}

.fav-star.active::after {
  content: '\2605';
  position: absolute;
  top: 0;
  left: 0;
}

/* ── Ops Bar ── */
#ops-bar {
  position: absolute;
  bottom: 82px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  padding: 6px 12px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  z-index: 50;
  transition: opacity 0.2s, transform 0.2s;
}

#ops-bar.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(6px);
}

#ops-bar button {
  padding: 7px 16px;
  border: none;
  border-radius: 6px;
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.12s;
}

#ops-bar button:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-sm);
}

#ops-bar button:active {
  transform: scale(0.97);
}

#ops-bar .btn-combine {
  background: var(--success);
  color: white;
}

#ops-bar .btn-cut {
  background: var(--danger);
  color: white;
}

#ops-bar .btn-intersect {
  background: var(--accent);
  color: white;
}

#ops-bar .btn-hollow {
  background: var(--warning);
  color: var(--text);
}

/* ── Properties Panel ── */
#properties-panel {
  grid-row: 2;
  grid-column: 3;
  width: var(--panel-width);
  background: var(--panel-bg);
  backdrop-filter: blur(12px);
  border-left: 1px solid var(--border);
  box-shadow: -2px 0 16px rgba(0, 0, 0, 0.04);
  z-index: 60;
  overflow-y: auto;
  padding: 16px;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  transform: translateX(0);
}

#properties-panel.hidden {
  transform: translateX(100%);
  pointer-events: none;
}

#properties-panel h3 {
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-light);
  margin: 16px 0 8px;
}

#properties-panel h3:first-child {
  margin-top: 0;
}

/* Color swatches */
.color-swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.color-swatch {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.1s, border-color 0.12s, box-shadow 0.12s;
}

.color-swatch:hover {
  transform: scale(1.12);
}

.color-swatch.active {
  border-color: var(--text);
  box-shadow: 0 0 0 2px white, 0 0 0 3.5px var(--accent);
}

/* Dimension inputs */
.dim-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

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

.dim-row label {
  font-weight: 700;
  font-size: 12px;
  width: 20px;
  color: var(--text-muted);
}

.dim-row input {
  flex: 1;
  height: 30px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0 8px;
  font-family: 'Nunito', sans-serif;
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  outline: none;
  transition: border-color 0.12s, box-shadow 0.12s;
}

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

/* Shape name input */
.prop-name-row {
  margin-bottom: 4px;
}

.prop-name-input {
  width: 100%;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0 10px;
  font-family: 'Nunito', sans-serif;
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  outline: none;
  transition: border-color 0.12s, box-shadow 0.12s;
}

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

/* Axis color labels */
.dim-row label.axis-x { color: #e74c3c; }
.dim-row label.axis-y { color: #00b894; }
.dim-row label.axis-z { color: #0984e3; }

/* Action buttons */
.panel-actions {
  display: flex;
  gap: 6px;
  margin-top: 14px;
}

.panel-actions button {
  flex: 1;
  padding: 7px 0;
  border: none;
  border-radius: 6px;
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 12px;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.12s;
}

.panel-actions button:hover {
  opacity: 0.88;
}

.panel-actions button:active {
  transform: scale(0.97);
}

.btn-duplicate {
  background: var(--accent-light);
  color: white;
}

.btn-delete {
  background: var(--danger);
  color: white;
}

/* ── CSG Guide Overlay ── */
#csg-guide {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 24px;
  background: rgba(0, 0, 0, 0.82);
  color: white;
  border-radius: 10px;
  font-weight: 700;
  font-size: 14px;
  z-index: 200;
  pointer-events: none;
  text-align: center;
  transition: opacity 0.2s;
  backdrop-filter: blur(8px);
}

/* ── Selection highlighting ── */
.mesh-highlight-keep {
  outline: 3px solid var(--success);
}

.mesh-highlight-cut {
  outline: 3px solid var(--danger);
}

/* ── Global popup style ── */
.v4-popup {
  animation: popupIn 0.15s ease-out;
}

@keyframes popupIn {
  from { opacity: 0; transform: translate(-50%, -48%) scale(0.96); }
  to   { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

/* ── Range slider styling ── */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 3px;
  background: #e9ecef;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
  transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  #app {
    grid-template-columns: 140px 1fr var(--panel-width);
  }

  .tool-btn {
    padding: 5px 8px;
    font-size: 11px;
  }

  #properties-panel {
    position: fixed;
    right: 0;
    left: auto;
    top: var(--topbar-height);
    bottom: 0;
    width: var(--panel-width);
  }

  #properties-panel.hidden {
    transform: translateX(100%);
  }
}

/* ── Mobile Toolbar (hidden on desktop) ── */
#mobile-toolbar {
  display: none;
}

@media (max-width: 768px) {
  #app {
    grid-template-columns: 0px 1fr 0px;
  }

  #left-tools { display: none; }

  /* Force viewport to span all columns when sidebar is hidden */
  #viewport-container {
    grid-column: 1 / -1;
  }

  /* Show mobile toolbar */
  #mobile-toolbar {
    display: flex;
    position: fixed;
    left: 0; right: 0; bottom: 0;
    height: calc(56px + env(safe-area-inset-bottom, 0px));
    padding-bottom: env(safe-area-inset-bottom, 0px);
    background: var(--panel-bg);
    border-top: 1px solid var(--border);
    box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.08);
    z-index: 500;
    align-items: center;
    justify-content: space-around;
    padding: 0 4px;
    gap: 2px;
  }

  .mob-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: none;
    background: none;
    padding: 6px 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.12s;
    min-width: 40px;
  }

  .mob-btn .icon-svg {
    width: 22px;
    height: 22px;
    margin: 0;
  }

  .mob-btn:hover, .mob-btn:active {
    background: var(--accent-glow);
  }

  .mob-btn.active {
    background: var(--accent-glow);
    outline: 2px solid var(--accent);
  }

  .mob-btn:disabled {
    opacity: 0.3;
    pointer-events: none;
  }

  .mob-btn.danger .icon-svg {
    filter: hue-rotate(320deg) saturate(2);
  }

  /* Shape dock: fixed position on mobile so it's not clipped by overflow:hidden */
  #shape-dock {
    position: fixed !important;
    bottom: calc(60px + env(safe-area-inset-bottom, 0px)) !important;
    left: 50% !important;
    transform: translateX(-50%) !important;
    max-height: 35vh;
    max-width: 95vw;
    overflow-y: auto;
    z-index: 600;
  }

  /* Shift viewport hints above dock */
  #viewport-hints {
    bottom: 128px;
  }

  #properties-panel {
    position: fixed;
    left: 0; right: 0; bottom: 56px; top: auto;
    width: 100%;
    height: 240px;
    border-left: none;
    border-top: 1px solid var(--border);
  }

  #properties-panel.hidden {
    transform: translateY(100%);
  }

  /* Touch support for viewport */
  #viewport {
    touch-action: none;
    width: 100% !important;
    height: 100% !important;
  }

  #viewport-container {
    min-height: 0;
  }

  /* Enlarge touch targets on mobile */
  .color-swatch {
    min-width: 40px !important;
    min-height: 40px !important;
    width: 40px !important;
    height: 40px !important;
  }

  .dim-row input {
    height: 44px !important;
    font-size: 16px !important; /* prevents iOS zoom on focus */
  }

  .material-btn {
    padding: 10px 12px !important;
    min-height: 44px;
  }

  /* Active feedback for touch (no hover on touch) */
  .mob-btn:active {
    background: var(--accent-glow);
    transform: scale(0.92);
  }

  .mob-btn.active {
    background: var(--accent-glow);
    outline: 2px solid var(--accent);
    outline-offset: -2px;
  }

  /* Shape dock buttons bigger on mobile */
  .shape-btn {
    min-width: 64px !important;
    min-height: 64px !important;
  }

  /* Compact topbar */
  #topbar {
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none;
    gap: 2px;
    padding: 0 8px;
  }
  #topbar::-webkit-scrollbar { display: none; }

  #topbar button {
    padding: 4px 6px;
    font-size: 11px;
    flex-shrink: 0;
  }

  #topbar .logo {
    font-size: 14px;
    flex-shrink: 0;
    margin-right: 4px;
  }

  /* Hide less-used buttons on small screens */
  #topbar #btn-shortcuts,
  #topbar #btn-darkmode,
  #topbar #btn-screenshot {
    display: none;
  }

  /* Hide text labels on topbar buttons — icon only */
  #topbar #btn-new,
  #topbar #btn-import {
    font-size: 0;
  }
  #topbar #btn-new .icon-svg,
  #topbar #btn-import .icon-svg {
    font-size: initial;
    margin: 0;
  }

  /* Ensure mobile toolbar doesn't overlap shape dock */
  #viewport-container {
    padding-bottom: 56px; /* reserve space for mobile toolbar */
  }
}

/* ── Sketch Mode ── */
#sketch-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  pointer-events: none;
  z-index: 200;
}

.sketch-toolbar {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  background: rgba(108, 92, 231, 0.95);
  backdrop-filter: blur(12px);
  color: white;
  font-family: 'Nunito', sans-serif;
  font-size: 13px;
}

.sketch-title {
  font-weight: 800;
  font-size: 14px;
  letter-spacing: -0.2px;
}

.sketch-shapes {
  display: flex;
  gap: 4px;
}

.sketch-shape-btn {
  width: 32px;
  height: 32px;
  border: 1.5px solid rgba(255,255,255,0.35);
  border-radius: 6px;
  background: rgba(255,255,255,0.12);
  color: white;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, transform 0.1s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sketch-shape-btn:hover {
  background: rgba(255,255,255,0.28);
  border-color: rgba(255,255,255,0.7);
  transform: scale(1.1);
}

.sketch-shape-btn:active {
  transform: scale(0.95);
}

.sketch-status {
  flex: 1;
  font-weight: 600;
  opacity: 0.85;
  font-size: 12px;
}

.sketch-actions {
  display: flex;
  gap: 6px;
}

.sketch-actions button {
  padding: 5px 14px;
  border: 1.5px solid rgba(255,255,255,0.4);
  border-radius: 6px;
  background: rgba(255,255,255,0.15);
  color: white;
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}

.sketch-actions button:hover {
  background: rgba(255,255,255,0.25);
  border-color: rgba(255,255,255,0.6);
}

.sketch-actions button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.sketch-actions button#sketch-close-path {
  background: rgba(0, 184, 148, 0.7);
  border-color: rgba(0, 184, 148, 0.8);
}

.sketch-actions button#sketch-close-path:hover:not(:disabled) {
  background: rgba(0, 184, 148, 0.9);
}

.sketch-actions button#sketch-cancel {
  background: rgba(231, 76, 60, 0.5);
  border-color: rgba(231, 76, 60, 0.6);
}

.sketch-actions button#sketch-cancel:hover {
  background: rgba(231, 76, 60, 0.7);
}

/* ── Sketch Measurements ── */
.sketch-measure-label {
  position: absolute;
  transform: translate(-50%, -50%);
  background: rgba(108, 92, 231, 0.9);
  color: white;
  font-family: 'Nunito', sans-serif;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  pointer-events: none;
  z-index: 150;
  white-space: nowrap;
}

.sketch-measure-editable {
  cursor: pointer;
  pointer-events: auto !important;
}

.sketch-measure-editable:hover {
  outline: 2px solid white;
  outline-offset: 2px;
}

.sketch-measure-dim {
  position: absolute;
  transform: translate(-50%, -50%);
  background: rgba(0, 184, 148, 0.9);
  color: white;
  font-family: 'Nunito', sans-serif;
  font-size: 11px;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 5px;
  pointer-events: none;
  z-index: 150;
  white-space: nowrap;
}

/* ── Sketch Info in Properties Panel ── */
.sketch-info {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.sketch-info h3 {
  color: var(--accent);
}

.sketch-info-details {
  margin: 8px 0;
}

.sketch-stat {
  display: flex;
  justify-content: space-between;
  padding: 3px 0;
  font-size: 12px;
  color: var(--text-muted);
}

.sketch-stat span:last-child {
  font-weight: 700;
  color: var(--text);
}

.material-swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 8px;
}

.material-btn {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text);
  font-family: 'Nunito', sans-serif;
  font-size: 10px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.12s, background 0.12s;
}

.material-btn:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.btn-edit-profile {
  width: 100%;
  padding: 8px;
  border: 1.5px solid var(--accent);
  border-radius: var(--radius-sm);
  background: var(--accent-glow);
  color: var(--accent);
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
}

.btn-edit-profile:hover {
  background: var(--accent);
  color: white;
}

/* ── Drag-to-Extrude Height Label ── */
.sketch-height-label {
  position: absolute;
  transform: translate(0, -50%);
  background: rgba(0, 0, 0, 0.85);
  color: #00b894;
  font-family: 'Nunito', sans-serif;
  font-size: 16px;
  font-weight: 800;
  padding: 6px 12px;
  border-radius: 8px;
  pointer-events: auto;
  z-index: 200;
  cursor: pointer;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 4px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.3);
  transition: background 0.1s;
}

.sketch-height-label:hover {
  background: rgba(0, 0, 0, 0.95);
}

.sketch-height-label .height-value {
  font-size: 18px;
  min-width: 30px;
  text-align: right;
}

.sketch-height-label .height-unit {
  font-size: 12px;
  opacity: 0.7;
  font-weight: 600;
}

.sketch-height-label .height-input {
  width: 60px;
  height: 28px;
  border: 1px solid #00b894;
  border-radius: 4px;
  background: rgba(0, 184, 148, 0.15);
  color: #00b894;
  font-family: 'Nunito', sans-serif;
  font-size: 16px;
  font-weight: 800;
  text-align: center;
  outline: none;
}

/* ── Sketch Fill Preview ── */
.sketch-fill-hint {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(108, 92, 231, 0.9);
  color: white;
  font-family: 'Nunito', sans-serif;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 6px;
  pointer-events: none;
  z-index: 150;
}

/* ══════════════════════════════════
   Shelf Builder
   ══════════════════════════════════ */

#shelf-overlay {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  pointer-events: none;
}

.shelf-panel {
  pointer-events: auto;
  position: absolute;
  top: 8px;
  right: 8px;
  width: 260px;
  background: var(--panel-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  font-family: 'Nunito', sans-serif;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
}

.shelf-title {
  font-weight: 800;
  font-size: 15px;
  color: var(--accent);
  margin-bottom: 2px;
}

.shelf-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 10px;
}

.shelf-dims {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}

.shelf-dim-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.shelf-dim-row label {
  width: 52px;
  font-weight: 700;
  font-size: 12px;
  color: var(--text);
}

.shelf-dim-row input {
  flex: 1;
  height: 30px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0 8px;
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  font-family: inherit;
  outline: none;
  transition: border-color 0.12s;
}

.shelf-dim-row input:focus {
  border-color: var(--accent);
}

.shelf-dim-row span {
  font-size: 11px;
  color: var(--text-muted);
  width: 24px;
}

.shelf-actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 12px;
}

.shelf-btn-primary {
  padding: 10px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: white;
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.12s;
}

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

.shelf-btn-accent {
  padding: 8px;
  border: 1.5px solid var(--success);
  border-radius: var(--radius-sm);
  background: rgba(0, 184, 148, 0.1);
  color: var(--success);
  font-weight: 700;
  font-size: 12px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.12s, color 0.12s;
  width: 100%;
}

.shelf-btn-accent:hover {
  background: var(--success);
  color: white;
}

.shelf-btn-secondary {
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: white;
  color: var(--text-muted);
  font-weight: 700;
  font-size: 12px;
  cursor: pointer;
  font-family: inherit;
}

.shelf-btn-secondary:hover {
  background: #f0f0f4;
}

/* Compartment list */
.shelf-compartment-list {
  margin-bottom: 10px;
}

.shelf-empty {
  font-size: 11px;
  color: var(--text-light);
  text-align: center;
  padding: 8px;
}

.shelf-comp-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  background: #f8f9fc;
  border-radius: 6px;
  margin-bottom: 4px;
  font-size: 11px;
}

.shelf-comp-label {
  font-weight: 700;
  color: var(--accent);
  min-width: 40px;
}

.shelf-comp-dims {
  font-weight: 600;
  color: var(--text);
}

.shelf-comp-pos {
  flex: 1;
  color: var(--text-muted);
  text-align: right;
  font-size: 10px;
}

.shelf-comp-del {
  width: 20px;
  height: 20px;
  border: none;
  border-radius: 4px;
  background: rgba(231, 76, 60, 0.1);
  color: var(--danger);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.shelf-comp-del:hover {
  background: var(--danger);
  color: white;
}

/* Wall thickness measurement labels */
.sketch-measure-wall {
  position: absolute;
  transform: translate(-50%, -50%);
  background: rgba(253, 203, 110, 0.95);
  color: #2d3436;
  font-family: 'Nunito', sans-serif;
  font-size: 10px;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 4px;
  pointer-events: none;
  z-index: 150;
  white-space: nowrap;
}

.shelf-add-section {
  border-top: 1px solid var(--border);
  padding-top: 8px;
}

/* ══════════════════════════════════
   Face Operations
   ══════════════════════════════════ */

#faceops-overlay {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  pointer-events: none;
}

.faceops-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.faceops-row > label {
  width: 60px;
  font-weight: 700;
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.faceops-row select {
  flex: 1;
  height: 30px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0 8px;
  font-size: 12px;
  font-weight: 600;
  font-family: inherit;
  outline: none;
  background: white;
}

.faceops-toggle {
  display: flex;
  flex: 1;
  gap: 2px;
  background: #f0f0f4;
  border-radius: 6px;
  padding: 2px;
}

.fo-toggle {
  flex: 1;
  padding: 5px 6px;
  border: none;
  border-radius: 5px;
  background: transparent;
  color: var(--text-muted);
  font-family: inherit;
  font-weight: 700;
  font-size: 11px;
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
}

.fo-toggle.active {
  background: white;
  color: var(--accent);
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}

.fo-toggle:hover:not(.active) {
  color: var(--text);
}

.faceops-section {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

.fo-shape-item {
  cursor: pointer;
  transition: background 0.1s;
}

.fo-shape-item:hover {
  background: #f0ecff !important;
}

.fo-shape-item.fo-selected {
  background: #f0ecff !important;
  border-left: 3px solid var(--accent);
}

.fo-shape-edit {
  width: 20px;
  height: 20px;
  border: none;
  border-radius: 4px;
  background: rgba(108, 92, 231, 0.1);
  color: var(--accent);
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.fo-shape-edit:hover {
  background: var(--accent);
  color: white;
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 5px;
}

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

::-webkit-scrollbar-thumb {
  background: #d0d0d0;
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: #bbb;
}

/* ── Inline Tooltip Help ── */
#left-tools [data-tooltip] {
  position: relative;
}

#left-tools [data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  left: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%);
  background: #2d3436;
  color: #fff;
  font-family: 'Nunito', sans-serif;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.4;
  padding: 6px 10px;
  border-radius: 6px;
  max-width: 200px;
  width: max-content;
  word-wrap: break-word;
  white-space: normal;
  z-index: 10000;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease 500ms;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

#left-tools [data-tooltip]::before {
  content: "";
  position: absolute;
  left: calc(100% + 4px);
  top: 50%;
  transform: translateY(-50%);
  border: 5px solid transparent;
  border-right-color: #2d3436;
  z-index: 10000;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease 500ms;
}

#left-tools [data-tooltip]:hover::after,
#left-tools [data-tooltip]:hover::before {
  opacity: 1;
}

/* Touch devices: show tooltip on active/focus instead of hover */
@media (hover: none) {
  #left-tools [data-tooltip]:hover::after,
  #left-tools [data-tooltip]:hover::before {
    opacity: 0;
  }
  #left-tools [data-tooltip]:active::after,
  #left-tools [data-tooltip]:focus::after {
    opacity: 1;
    transition-delay: 0ms;
  }
  #left-tools [data-tooltip]:active::before,
  #left-tools [data-tooltip]:focus::before {
    opacity: 1;
    transition-delay: 0ms;
  }
}