/* =========================================================
   Gaussian Splat 3D Viewer — Modern Glassmorphic Stylesheet
   ========================================================= */

:root {
  --bg-primary: #111115;
  --panel-bg: rgba(22, 22, 28, 0.82);
  --panel-border: rgba(255, 255, 255, 0.12);
  --panel-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
  --accent-cyan: #38bdf8;
  --accent-indigo: #818cf8;
  --accent-pink: #f43f5e;
  --accent-purple: #c084fc;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --input-bg: rgba(255, 255, 255, 0.06);
  --input-border: rgba(255, 255, 255, 0.15);
  --btn-hover-bg: rgba(255, 255, 255, 0.14);
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  user-select: none;
}

/* Global Website Header Container */
#main-nav-placeholder {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: auto;
  z-index: 9999;
  background: transparent;
  pointer-events: auto;
}

/* Fullscreen 3D Canvas */
#canvas-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1;
  background-color: var(--bg-primary);
  outline: none;
}

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

/* Crosshair for Walk-Around Mode */
.walk-crosshair {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 18px;
  height: 18px;
  pointer-events: none;
  z-index: 15;
  display: none;
  transition: opacity 0.2s ease;
}

.walk-crosshair.active {
  display: block;
}

.walk-crosshair::before,
.walk-crosshair::after {
  content: '';
  position: absolute;
  background: rgba(255, 255, 255, 0.75);
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.8);
}

.walk-crosshair::before {
  top: 8px;
  left: 0;
  width: 18px;
  height: 2px;
}

.walk-crosshair::after {
  top: 0;
  left: 8px;
  width: 2px;
  height: 18px;
}

.walk-crosshair-dot {
  position: absolute;
  top: 7px;
  left: 7px;
  width: 4px;
  height: 4px;
  background: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--accent-cyan);
}

/* Drag & Drop Visual Overlay */
.drop-overlay {
  position: fixed;
  inset: 16px;
  z-index: 5000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 3px dashed var(--accent-cyan);
  border-radius: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1), transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  transform: scale(0.97);
  box-shadow: 0 0 60px rgba(56, 189, 248, 0.25);
}

.drop-overlay.active {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1);
}

.drop-overlay-icon {
  width: 80px;
  height: 80px;
  margin-bottom: 20px;
  color: var(--accent-cyan);
  animation: floatBounce 2s ease-in-out infinite;
}

.drop-overlay-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 8px 0;
  background: linear-gradient(135deg, #ffffff 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.drop-overlay-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  margin: 0;
}

.drop-overlay-formats {
  margin-top: 14px;
  display: flex;
  gap: 8px;
}

.format-tag {
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: var(--accent-cyan);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-mono);
}

@keyframes floatBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* =========================================================
   Floating Controls Panel (Glassmorphism)
   ========================================================= */

.controls-panel {
  position: absolute;
  top: 72px;
  left: 20px;
  width: 350px;
  max-height: calc(100vh - 96px);
  z-index: 100;
  display: flex;
  flex-direction: column;
  background: var(--panel-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--panel-shadow);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
  overflow: hidden;
}

.controls-panel.collapsed {
  transform: translateX(calc(-100% - 30px));
  pointer-events: none;
  opacity: 0;
}

/* Panel Header */
.panel-header {
  padding: 16px 18px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.02);
}

.panel-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
  animation: pulseDot 2.5s infinite;
}

@keyframes pulseDot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.35); opacity: 0.7; }
}

.panel-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #ffffff;
}

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

.panel-collapse-btn:hover {
  color: var(--text-primary);
  background: var(--btn-hover-bg);
}

/* Navigation Tabs */
.panel-tabs {
  display: flex;
  background: rgba(0, 0, 0, 0.25);
  padding: 6px;
  gap: 4px;
  border-bottom: 1px solid var(--panel-border);
}

.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 6px;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s ease;
}

.tab-btn svg {
  width: 15px;
  height: 15px;
}

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

.tab-btn.active {
  background: rgba(56, 189, 248, 0.16);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.35);
}

/* Panel Scrollable Body */
.panel-body {
  padding: 16px 18px;
  overflow-y: auto;
  max-height: calc(100vh - 230px);
  display: flex;
  flex-direction: column;
  gap: 18px;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}

.panel-body::-webkit-scrollbar {
  width: 6px;
}

.panel-body::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
}

/* Tab Content Visibility */
.tab-content {
  display: none;
  flex-direction: column;
  gap: 16px;
}

.tab-content.active {
  display: flex;
}

/* Control Elements & Typography */
.section-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* Mode Switch Pills (Orbit vs Walk) */
.mode-switch-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: rgba(0, 0, 0, 0.4);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.mode-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 8px;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.mode-btn svg {
  width: 17px;
  height: 17px;
}

.mode-btn.active {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.25) 0%, rgba(129, 140, 248, 0.25) 100%);
  color: #ffffff;
  border: 1px solid rgba(56, 189, 248, 0.45);
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.2);
}

/* Preset View Grid */
.grid-presets {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.btn-chip {
  padding: 7px 4px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  transition: all 0.15s ease;
}

.btn-chip:hover {
  background: var(--btn-hover-bg);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-chip:active {
  transform: scale(0.96);
}

/* Sliders */
.slider-container {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.slider-val {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 2px 7px;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

/* Modern Thick Capsule Slider Tracks */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  display: block;
  width: 100%;
  height: 20px;
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 9999px;
  padding: 0 4px; /* Padding at ends so thumb doesn't collide with track edges */
  box-sizing: border-box;
  outline: none;
  cursor: pointer;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.5), 0 1px 2px rgba(255, 255, 255, 0.04);
  transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

input[type="range"]:hover {
  background: rgba(15, 23, 42, 0.9);
  border-color: rgba(56, 189, 248, 0.45);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.5), 0 0 10px rgba(56, 189, 248, 0.18);
}

input[type="range"]:focus-visible {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.35), inset 0 2px 4px rgba(0, 0, 0, 0.5);
}

/* WebKit Track & Centered Thumb */
input[type="range"]::-webkit-slider-runnable-track {
  -webkit-appearance: none;
  height: 100%;
  background: transparent;
  border: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  border: 1.5px solid #ffffff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5), 0 0 6px rgba(56, 189, 248, 0.6);
  cursor: pointer;
  /* Centering: track content is 18px (20px - 2px border), thumb is 12px -> (18 - 12) / 2 = 3px */
  margin-top: 3px;
  transition: transform 0.15s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.15s ease, background 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.22);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.6), 0 0 12px rgba(56, 189, 248, 0.95);
}

input[type="range"]::-webkit-slider-thumb:active {
  transform: scale(1.3);
  background: linear-gradient(135deg, #7dd3fc 0%, #38bdf8 100%);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.7), 0 0 16px #38bdf8;
}

/* Firefox Track & Centered Thumb */
input[type="range"]::-moz-range-track {
  height: 100%;
  background: transparent;
  border: none;
}

input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  border: 1.5px solid #ffffff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5), 0 0 6px rgba(56, 189, 248, 0.6);
  cursor: pointer;
  border: 1.5px solid #ffffff;
  transition: transform 0.15s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.15s ease;
}

input[type="range"]::-moz-range-thumb:hover {
  transform: scale(1.22);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.6), 0 0 12px rgba(56, 189, 248, 0.95);
}

input[type="range"]::-moz-range-thumb:active {
  transform: scale(1.3);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.7), 0 0 16px #38bdf8;
}

/* Action Buttons */
.btn-action {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s ease;
}

.btn-action:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-action.primary {
  background: linear-gradient(135deg, #0284c7 0%, #6366f1 100%);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 4px 16px rgba(2, 132, 199, 0.35);
}

.btn-action.primary:hover {
  background: linear-gradient(135deg, #0369a1 0%, #4f46e5 100%);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.5);
}

/* Flip & Rotate Tools */
.flip-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.flip-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px 6px;
  gap: 6px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.18s ease;
}

.flip-btn:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.flip-btn.active {
  background: rgba(56, 189, 248, 0.25);
  border-color: var(--accent-cyan);
  color: #ffffff;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.3);
}

.flip-axis-tag {
  font-size: 0.95rem;
  font-weight: 800;
  font-family: var(--font-mono);
}

.flip-desc {
  font-size: 0.65rem;
  color: var(--text-muted);
}

/* 90-degree Rotation Controls */
.rotate-stepper-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.stepper-card {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 8px 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.stepper-label {
  font-size: 0.72rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.stepper-btns {
  display: flex;
  width: 100%;
  gap: 4px;
}

.stepper-btn {
  flex: 1;
  padding: 6px 2px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 0.72rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
}

.stepper-btn:hover {
  background: var(--btn-hover-bg);
  border-color: rgba(255, 255, 255, 0.3);
}

/* Select & Inputs */
select.custom-select {
  width: 100%;
  padding: 9px 12px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-sm);
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  transition: border-color 0.15s ease;
}

select.custom-select:focus {
  border-color: var(--accent-cyan);
}

select.custom-select option {
  background: #18181f;
  color: #ffffff;
}

/* Background Color Swatches */
.color-swatches {
  display: flex;
  gap: 8px;
}

.color-swatch {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.color-swatch:hover {
  transform: scale(1.18);
}

.color-swatch.active {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
}

/* Checkbox Toggle Switch */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.switch {
  position: relative;
  display: inline-block;
  width: 38px;
  height: 22px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: rgba(255, 255, 255, 0.18);
  border-radius: 22px;
  transition: 0.25s ease;
}

.switch-slider::before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  border-radius: 50%;
  transition: 0.25s ease;
}

.switch input:checked + .switch-slider {
  background-color: var(--accent-cyan);
}

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

/* =========================================================
   Floating Bottom HUD
   ========================================================= */

.floating-hud {
  position: absolute;
  bottom: 24px;
  right: 24px;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 12px;
}

.hud-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: 30px;
  box-shadow: var(--panel-shadow);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.hud-pill strong {
  color: #ffffff;
  font-family: var(--font-mono);
}

.hud-icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: 50%;
  color: var(--text-primary);
  box-shadow: var(--panel-shadow);
  cursor: pointer;
  transition: all 0.18s ease;
}

.hud-icon-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.08);
  color: var(--accent-cyan);
}

/* Floating Expand Toggle (when panel collapsed) */
.toggle-panel-btn {
  position: absolute;
  top: 72px;
  left: 20px;
  z-index: 99;
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: 30px;
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--panel-shadow);
  transition: all 0.2s ease;
}

.toggle-panel-btn.visible {
  display: flex;
}

.toggle-panel-btn:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: var(--accent-cyan);
}

/* Walk mode notification badge */
.walk-hint-badge {
  position: absolute;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 90;
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: 30px;
  color: #ffffff;
  font-size: 0.85rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  pointer-events: none;
  animation: fadeInOut 4s forwards;
}

.walk-hint-badge.active {
  display: flex;
}

.key-tag {
  background: rgba(255, 255, 255, 0.15);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 76px;
  right: 20px;
  z-index: 9000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  background: rgba(24, 24, 32, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-md);
  color: #ffffff;
  font-size: 0.88rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  pointer-events: auto;
  transform: translateX(50px);
  opacity: 0;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast.show {
  transform: translateX(0);
  opacity: 1;
}

.toast.success {
  border-color: rgba(56, 189, 248, 0.5);
}

.toast.error {
  border-color: rgba(244, 63, 94, 0.5);
}

/* Loading Overlay */
#splat-loading-overlay,
.splat-loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 6000;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(17, 17, 21, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

#splat-loading-overlay.active,
.splat-loading-overlay.active {
  display: flex !important;
  opacity: 1 !important;
  pointer-events: auto !important;
}

.spinner {
  width: 52px;
  height: 52px;
  border: 4px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--accent-cyan);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 20px;
}

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

.splat-loading-text {
  font-size: 1.15rem;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 8px;
}

.splat-loading-subtext {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Modal Dialog (Keybinds) */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 8000;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
}

.modal-backdrop.open {
  display: flex;
}

.modal-card {
  width: 440px;
  max-width: 90vw;
  background: var(--panel-bg);
  backdrop-filter: blur(24px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--panel-shadow);
  padding: 24px;
  color: #ffffff;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}

.modal-header h3 {
  margin: 0;
  font-size: 1.25rem;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
}

.shortcut-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .controls-panel {
    top: 64px;
    left: 10px;
    right: 10px;
    width: auto;
    max-height: calc(100vh - 140px);
  }

  .floating-hud {
    bottom: 16px;
    right: 16px;
    left: 16px;
    justify-content: space-between;
  }
}

/* =========================================================
   Ground & Axis Alignment Specific Tools
   ========================================================= */

#canvas-container.picking-ground {
  cursor: crosshair !important;
}

/* Quick Alignment Grid */
.quick-fix-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.quick-fix-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s ease;
  text-align: left;
}

.quick-fix-btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: var(--accent-cyan);
}

.quick-fix-btn:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: rgba(56, 189, 248, 0.4);
  transform: translateY(-1px);
}

.quick-fix-btn.highlight {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2) 0%, rgba(129, 140, 248, 0.2) 100%);
  border: 1px solid rgba(56, 189, 248, 0.45);
}

.quick-fix-btn.active {
  background: rgba(16, 185, 129, 0.25);
  border-color: var(--accent-emerald);
  color: #ffffff;
  box-shadow: 0 0 14px rgba(16, 185, 129, 0.35);
}

.quick-fix-btn.active svg {
  color: var(--accent-emerald);
}

/* 3D Transform Gizmo Toolbar */
.gizmo-toolbar {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 10px;
}

.gizmo-mode-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
}

.gizmo-btn {
  padding: 6px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  transition: all 0.15s ease;
}

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

.gizmo-btn.active {
  background: rgba(56, 189, 248, 0.25);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Height & Tilt Nudge Grids */
.nudge-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 4px;
  margin-top: 4px;
}

.nudge-btn {
  padding: 5px 2px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 4px;
  color: var(--text-secondary);
  font-size: 0.68rem;
  font-family: var(--font-mono);
  font-weight: 700;
  cursor: pointer;
  text-align: center;
  transition: all 0.15s ease;
}

.nudge-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.3);
}

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

/* Pick Ground Floating Banner */
.pick-ground-banner {
  position: absolute;
  top: 76px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 500;
  display: none;
  align-items: center;
  gap: 12px;
  padding: 10px 22px;
  background: rgba(16, 185, 129, 0.95);
  color: #ffffff;
  border-radius: 30px;
  box-shadow: 0 10px 30px rgba(16, 185, 129, 0.4);
  font-size: 0.9rem;
  font-weight: 600;
  animation: pulseBanner 2s infinite;
}

.pick-ground-banner.active {
  display: flex;
}

.cancel-pick-btn {
  background: rgba(0, 0, 0, 0.25);
  border: none;
  color: #ffffff;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  cursor: pointer;
}

.cancel-pick-btn:hover {
  background: rgba(0, 0, 0, 0.45);
}

@keyframes pulseBanner {
  0%, 100% { transform: translateX(-50%) scale(1); }
  50% { transform: translateX(-50%) scale(1.02); }
}