html{overflow-y:scroll;scroll-behavior:smooth}
/* GLB / glTF Studio Pro - Main Stylesheet & Design System */
:root {
  --bg-dark: #080a12;
  --bg-card: rgba(14, 18, 28, 0.75);
  --bg-card-hover: rgba(20, 26, 40, 0.85);
  --bg-sidebar: rgba(10, 14, 22, 0.85);
  --bg-input: rgba(255, 255, 255, 0.05);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(0, 210, 255, 0.4);
  
  --primary: #00d2ff;
  --primary-hover: #00b4db;
  --primary-glow: rgba(0, 210, 255, 0.35);
  --accent: #3a7bd5;
  --accent-glow: rgba(58, 123, 213, 0.35);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;

  --text-main: #f3f4f6;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-main: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --glass-blur: blur(16px);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  -webkit-font-smoothing: antialiased;
}

/* App Container */
#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
  background-color: #0a0c10;
  background-image: radial-gradient(circle at 50% 0%, rgba(0, 210, 255, 0.15), transparent 70%);
}

/* Top Navbar */
.navbar {
  height: 56px;
  background: rgba(10, 12, 16, 0.85);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-icon {
  width: 34px;
  height: 34px;
  background: rgba(0, 210, 255, 0.12);
  border: 1px solid rgba(0, 210, 255, 0.3);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px var(--primary-glow);
  color: #00d2ff;
}

.nav-tabs {
  display: flex;
  background: rgba(0, 0, 0, 0.3);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  gap: 4px;
}

.nav-tab {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-tab:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.nav-tab.active {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  box-shadow: 0 2px 10px var(--primary-glow);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Button Styles */
.btn {
  padding: 8px 16px;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
}

.btn-success {
  background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
  color: white;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

/* Main Workspace Split Layout */
.workspace {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
}

/* Sidebar Component */
.sidebar {
  width: 330px;
  background: rgba(14, 18, 28, 0.85);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  z-index: 20;
  transition: transform 0.3s ease;
}

.sidebar.right, #sidebar-right {
  border-right: none;
  border-left: 1px solid var(--border-color);
  background: rgba(14, 18, 28, 0.85);
}

.sidebar-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  font-weight: 700;
  font-size: 0.86rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-main);
  letter-spacing: 0.04em;
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Scrollbar styling */
.sidebar-content::-webkit-scrollbar,
.texture-grid::-webkit-scrollbar {
  width: 6px;
}

.sidebar-content::-webkit-scrollbar-thumb,
.texture-grid::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}

/* Panel Sections & Accordions */
.panel-group {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.panel-title {
  padding: 8px 12px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.panel-body {
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Form Controls */
.control-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.control-value {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.75rem;
}

select, input[type="text"], input[type="number"] {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.2s ease;
}

/* Modern Wireframe-Style Toggle Switch UI Component */
.toggle-switch-container {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--text-main);
  cursor: pointer;
  user-select: none;
  width: 100%;
  padding: 3px 0;
}

.toggle-switch-input {
  display: none;
}

.toggle-switch-slider {
  position: relative;
  width: 36px;
  height: 20px;
  background-color: #374151;
  border-radius: 20px;
  transition: background-color 0.25s ease, box-shadow 0.25s ease;
  flex-shrink: 0;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.toggle-switch-slider::before {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  background-color: #ffffff;
  border-radius: 50%;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

.toggle-switch-input:checked + .toggle-switch-slider {
  background-color: var(--primary);
  border-color: var(--primary-glow);
  box-shadow: 0 0 10px var(--primary-glow);
}

.toggle-switch-input:checked + .toggle-switch-slider::before {
  transform: translateX(16px);
}

/* Node Tree Item & Visibility Eye Buttons */
.tree-node-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.78rem;
  transition: background 0.15s ease, opacity 0.2s ease;
}

.tree-node-item:hover {
  background: rgba(255, 255, 255, 0.06);
}

.tree-node-item.selected {
  background: rgba(0, 210, 255, 0.2);
  border: 1px solid rgba(0, 210, 255, 0.4);
}

.tree-node-item.is-hidden {
  opacity: 0.45;
}

.tree-node-item.is-hidden .tree-label {
  text-decoration: line-through;
  color: var(--text-dim);
}

.btn-node-visibility {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 4px;
  font-size: 0.8rem;
  border-radius: 4px;
  margin-left: auto;
  opacity: 0.6;
  transition: all 0.2s ease;
}

.btn-node-visibility:hover {
  opacity: 1;
  color: var(--primary);
  background: rgba(0, 210, 255, 0.15);
}

select:focus, input:focus {
  border-color: var(--primary);
}

select option {
  background: #11141c;
  color: white;
}

/* Range Sliders */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.15);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  box-shadow: 0 0 8px var(--primary-glow);
  transition: transform 0.1s ease, background-color 0.15s ease;
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: none;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  box-shadow: 0 0 8px var(--primary-glow);
}

input[type="range"]::-webkit-slider-thumb:hover,
input[type="range"]::-moz-range-thumb:hover {
  transform: scale(1.25);
  background: #ffffff;
}

/* Central 3D Viewport */
.viewport-container {
  flex: 1;
  position: relative;
  background: radial-gradient(circle at center, #12161f 0%, #0a0c10 100%);
  overflow: hidden;
}

#canvas3d {
  width: 100%;
  height: 100%;
  display: block;
}

/* Channel Isolator Quick Bar (Floating Overlay) */
.channel-bar {
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(10, 14, 22, 0.85);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 6px;
  display: flex;
  gap: 6px;
  box-shadow: var(--shadow-main);
  z-index: 10;
}

.channel-btn {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
}

.channel-btn:hover {
  color: var(--text-main);
  background: rgba(0, 210, 255, 0.1);
  border-color: rgba(0, 210, 255, 0.3);
}

.channel-btn.active {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  border-color: transparent;
  box-shadow: 0 0 12px var(--primary-glow);
}

/* Overlay Stats Widget */
.viewport-stats {
  position: absolute;
  bottom: 16px;
  left: 16px;
  background: rgba(13, 16, 23, 0.75);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  display: flex;
  gap: 16px;
  color: var(--text-muted);
  z-index: 10;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-value {
  color: var(--accent);
  font-weight: 700;
}

/* Animation Bar Floating Dock */
.animation-dock {
  position: absolute;
  bottom: 16px;
  right: 16px;
  background: rgba(13, 16, 23, 0.8);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 8px 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 10;
  width: 420px;
}

.anim-play-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary);
  border: none;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 0 10px var(--primary-glow);
}

.anim-progress {
  flex: 1;
}

/* Dropzone Overlay */
.dropzone-overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 12, 16, 0.85);
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 2px dashed var(--border-highlight);
  margin: 20px;
  border-radius: var(--radius-xl);
  z-index: 50;
  transition: all 0.2s ease;
  pointer-events: auto;
}

.dropzone-overlay.hidden {
  display: none !important;
  opacity: 0;
  pointer-events: none;
}

.dropzone-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  max-width: 440px;
}

.dropzone-icon {
  width: 64px;
  height: 64px;
  background: rgba(99, 102, 241, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  box-shadow: 0 0 30px var(--primary-glow);
}

.dropzone-title {
  font-size: 1.4rem;
  font-weight: 700;
}

.dropzone-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Texture Gallery Grid View */
.texture-view-container {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.texture-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}

.texture-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.texture-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-highlight);
}

.texture-preview-wrapper {
  height: 160px;
  background: #000;
  background-image: linear-gradient(45deg, #181818 25%, transparent 25%),
                    linear-gradient(-45deg, #181818 25%, transparent 25%),
                    linear-gradient(45deg, transparent 75%, #181818 75%),
                    linear-gradient(-45deg, transparent 75%, #181818 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

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

.texture-info {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.texture-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.texture-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

/* Texture Gallery Toolbar & Enhancements */
.texture-gallery-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 12px 16px;
  background: rgba(14, 18, 28, 0.7);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
}

.texture-gallery-toolbar .toolbar-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.texture-gallery-toolbar .toolbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.texture-format-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  padding: 3px 8px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  backdrop-filter: blur(8px);
  z-index: 2;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.badge-webp {
  background: rgba(16, 185, 129, 0.25);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.5);
}

.badge-png {
  background: rgba(0, 210, 255, 0.22);
  color: #00d2ff;
  border: 1px solid rgba(0, 210, 255, 0.5);
}

.badge-jpeg, .badge-jpg {
  background: rgba(245, 166, 35, 0.25);
  color: #f5a623;
  border: 1px solid rgba(245, 166, 35, 0.5);
}

.badge-ktx2 {
  background: rgba(121, 40, 202, 0.3);
  color: #c084fc;
  border: 1px solid rgba(121, 40, 202, 0.6);
}

.texture-card-controls {
  display: flex;
  gap: 8px;
  margin-top: 8px;
  align-items: center;
}

.texture-card-controls select {
  flex: 1;
  padding: 5px 8px;
  font-size: 0.76rem;
  border-radius: 6px;
  background: rgba(10, 12, 16, 0.85);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  cursor: pointer;
}

.texture-card-controls .btn {
  padding: 5px 10px;
  font-size: 0.78rem;
  white-space: nowrap;
}

/* Converter Tool View */
.converter-container {
  flex: 1;
  padding: 30px;
  display: flex;
  gap: 30px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.converter-box {
  flex: 1;
  background: var(--bg-sidebar);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  box-shadow: var(--shadow-main);
}

.converter-box-title {
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--accent);
}

.json-preview-area {
  flex: 1;
  min-height: 240px;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #a5b4fc;
  overflow: auto;
  white-space: pre;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 1000;
}

.toast {
  padding: 12px 18px;
  border-radius: var(--radius-md);
  background: var(--bg-sidebar);
  border: 1px solid var(--border-color);
  color: white;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow-main);
  animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast.success { border-left: 4px solid var(--success); }
.toast.error { border-left: 4px solid var(--danger); }
.toast.info { border-left: 4px solid var(--accent); }

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Tree View */
.tree-node {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 0.8rem;
}

.tree-node-item {
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  color: var(--text-muted);
}

.tree-node-item:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
}

.tree-node-item.selected {
  background: rgba(99, 102, 241, 0.2);
  color: var(--accent);
}

/* ===================== SITE CHROME (portfolio integration) ===================== */
.site-links{display:flex;gap:4px;margin-inline-start:16px}
.site-links a{padding:7px 16px;border-radius:10px;font-size:.86rem;font-weight:600;color:var(--text-muted);text-decoration:none;transition:all .2s ease;white-space:nowrap}
.site-links a:hover{color:var(--text-main);background:rgba(255,255,255,.06)}
.site-footer{position:fixed;bottom:12px;left:50%;transform:translateX(-50%);z-index:40;font-size:.75rem;color:#f1f5f9;background:rgba(10,13,20,.88);backdrop-filter:blur(8px);padding:6px 18px;border-radius:20px;border:1px solid var(--border-color);pointer-events:auto;white-space:nowrap}
.site-footer a{color:var(--accent);text-decoration:none;font-weight:600}
.site-footer a:hover{text-decoration:underline}
@media (max-width:1150px){.site-links{display:none}}

/* Row 2 : Studio Toolbar (below site nav) */
.studio-bar{height:48px;flex-shrink:0;display:flex;align-items:center;justify-content:space-between;
  padding:0 16px;background:var(--bg-sidebar);border-bottom:1px solid var(--border-color)}
.studio-bar .nav-tabs{background:transparent;border:none;padding:0}
.studio-bar .nav-actions{display:flex;align-items:center;gap:10px}

/* Flex overflow fix: allow internal scrolling when top bars stack */
.workspace{min-height:0}
.sidebar{min-height:0}
#sidebar-left .sidebar-content,#sidebar-right .sidebar-content{overscroll-behavior:contain}

.site-footer span{color:#f1f5f9 !important}

/* Sticky site navbar (all pages) */
.navbar{position:sticky;top:0;z-index:100;border-radius:0}

.site-links a.active{color:#ffffff;background:linear-gradient(135deg, #00d2ff 0%, #3a7bd5 100%);box-shadow:0 4px 14px rgba(0, 210, 255, 0.35)}

/* SPA page sections: each tab = isolated frame, flex-fills under the bars */
.page-sec{display:flex;flex-direction:column;flex:1;min-height:0}
.page-sec[hidden]{display:none}
.page-sec iframe{flex:1;width:100%;border:0;background:#0a0c10}