:root {
  --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, sans-serif;
  --transition-smooth: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --bg-base: #0c0d12;
  --bg-gradient: radial-gradient(ellipse 70% 60% at 50% 0%, rgba(99, 102, 241, 0.12), transparent 75%),
                      radial-gradient(circle at 85% 90%, rgba(59, 130, 246, 0.06), transparent 50%),
                      #0c0d12;
  --surface-glass: rgba(18, 20, 29, 0.75);
  --surface-glass-border: rgba(255, 255, 255, 0.09);
  --surface-glass-border-hover: rgba(255, 255, 255, 0.18);
  --surface-subtle: rgba(255, 255, 255, 0.05);
  --surface-active: rgba(255, 255, 255, 0.12);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.32);
  --shadow-dock: 0 20px 50px -15px rgba(0, 0, 0, 0.65), 0 0 0 1px rgba(255, 255, 255, 0.08);
  --track-bg: rgba(255, 255, 255, 0.1);
  --track-fill: linear-gradient(90deg, #4f46e5, #818cf8);
}

[data-theme="light"] {
  --bg-base: #f3f5f9;
  --bg-gradient: radial-gradient(ellipse 70% 60% at 50% 0%, rgba(99, 102, 241, 0.08), transparent 75%),
                      radial-gradient(circle at 85% 90%, rgba(59, 130, 246, 0.04), transparent 50%),
                      #f3f5f9;
  --surface-glass: rgba(255, 255, 255, 0.82);
  --surface-glass-border: rgba(0, 0, 0, 0.07);
  --surface-glass-border-hover: rgba(0, 0, 0, 0.14);
  --surface-subtle: rgba(0, 0, 0, 0.04);
  --surface-active: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --accent: #4f46e5;
  --accent-light: #6366f1;
  --accent-glow: rgba(79, 70, 229, 0.2);
  --shadow-dock: 0 20px 50px -15px rgba(15, 23, 42, 0.12), 0 0 0 1px rgba(0, 0, 0, 0.05);
  --track-bg: rgba(0, 0, 0, 0.08);
  --track-fill: linear-gradient(90deg, #4f46e5, #6366f1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

[hidden], [hidden="true"] {
  display: none !important;
}

body {
  font-family: var(--font-family);
  background: var(--bg-gradient);
  background-color: var(--bg-base);
  color: var(--text-main);
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  user-select: none;
  transition: background-color 0.4s ease;
}

button, input {
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
}

/* ========================================================
   Header Navigation
======================================================== */
.studio-header {
  position: absolute;
  top: max(16px, env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%);
  width: min(960px, calc(100% - 36px));
  height: 52px;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
  background: var(--surface-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--surface-glass-border);
  border-radius: 100px;
  box-shadow: 0 10px 30px -10px rgba(0,0,0,0.15);
}

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

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  box-shadow: 0 0 15px var(--accent-glow);
}

.brand-text {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-title {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-badge {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: 20px;
  background: var(--surface-subtle);
  border: 1px solid var(--surface-glass-border);
  color: var(--accent-light);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-action-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 34px;
  padding: 0 12px;
  border-radius: 100px;
  border: 1px solid var(--surface-glass-border);
  background: var(--surface-subtle);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.icon-action-btn:hover {
  background: var(--surface-active);
  color: var(--text-main);
  border-color: var(--surface-glass-border-hover);
}

.icon-action-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 0 15px var(--accent-glow);
}

/* ========================================================
   Main 3D Viewport
======================================================== */
main {
  position: relative;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
}

#viewport {
  position: absolute;
  inset: 0;
  z-index: 1;
  cursor: grab;
}

#viewport:active {
  cursor: grabbing;
}

canvas {
  display: block;
  outline: none;
  width: 100%;
  height: 100%;
}

/* ========================================================
   Left Side HUD: Presets & Angles
======================================================== */
.side-presets {
  position: absolute;
  top: 90px;
  left: max(20px, env(safe-area-inset-left));
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 16px;
  pointer-events: auto;
}

.preset-group {
  background: var(--surface-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--surface-glass-border);
  border-radius: 18px;
  padding: 12px 10px;
  box-shadow: var(--shadow-dock);
  width: 155px;
}

.group-label {
  display: block;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 8px;
  padding-left: 6px;
}

.button-column {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.preset-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 7px 8px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  text-align: left;
}

.preset-btn:hover {
  background: var(--surface-subtle);
  color: var(--text-main);
}

.preset-btn.active {
  background: var(--surface-active);
  color: var(--text-main);
  border-color: var(--surface-glass-border-hover);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.preset-icon {
  font-size: 13px;
  line-height: 1;
  color: var(--accent-light);
}

.preset-text {
  flex: 1;
}

.preset-tag {
  font-size: 10px;
  font-weight: 500;
  opacity: 0.6;
}

.camera-btn {
  width: 100%;
  padding: 6px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  text-align: left;
}

.camera-btn:hover {
  background: var(--surface-subtle);
  color: var(--text-main);
}

.camera-btn.active {
  background: var(--surface-active);
  color: var(--text-main);
  border-color: var(--surface-glass-border-hover);
}

/* ========================================================
   Right Specs Drawer
======================================================== */
.specs-drawer {
  position: absolute;
  top: 90px;
  right: max(20px, env(safe-area-inset-right));
  z-index: 10;
  width: 260px;
  background: var(--surface-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--surface-glass-border);
  border-radius: 20px;
  padding: 16px;
  box-shadow: var(--shadow-dock);
  transform: translateX(0);
  opacity: 1;
  transition: var(--transition-smooth);
}

.specs-drawer.collapsed {
  transform: translateX(30px);
  opacity: 0;
  pointer-events: none;
}

.specs-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.specs-header h3 {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-main);
}

.close-btn {
  background: transparent;
  border: 0;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  padding: 2px 6px;
  border-radius: 6px;
}

.close-btn:hover {
  color: var(--text-main);
  background: var(--surface-subtle);
}

.specs-content {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.spec-card {
  display: flex;
  gap: 10px;
  padding: 8px 10px;
  background: var(--surface-subtle);
  border-radius: 12px;
  border: 1px solid var(--surface-glass-border);
}

.spec-icon {
  color: var(--accent-light);
  font-size: 14px;
  padding-top: 2px;
}

.spec-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 2px;
}

.spec-desc {
  font-size: 10px;
  color: var(--text-muted);
  line-height: 1.35;
}

.specs-footer {
  margin-top: 12px;
  padding-top: 8px;
  border-top: 1px solid var(--surface-glass-border);
  text-align: center;
}

.specs-footer span {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent-light);
}

/* ========================================================
   Center Bottom Dynamic Island Control Dock
======================================================== */
.control-dock {
  position: absolute;
  bottom: max(24px, env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  width: min(740px, calc(100% - 36px));
  display: flex;
  align-items: center;
  padding: 12px 18px;
  gap: 18px;
  background: var(--surface-glass);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--surface-glass-border);
  border-radius: 28px;
  box-shadow: var(--shadow-dock);
  transition: var(--transition-smooth);
}

.ui-selector-panel {
  flex-shrink: 0;
}

.ui-themes {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--surface-subtle);
  border-radius: 100px;
  border: 1px solid var(--surface-glass-border);
}

.ui-themes button {
  display: flex;
  align-items: center;
  gap: 6px;
  border: 0;
  border-radius: 100px;
  padding: 7px 13px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  background: transparent;
  cursor: pointer;
  transition: var(--transition-smooth);
  white-space: nowrap;
}

.tab-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.4;
}

.ui-themes button[aria-selected="true"] {
  background: var(--surface-active);
  color: var(--text-main);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.ui-themes button[aria-selected="true"] .tab-dot {
  background: var(--accent-light);
  opacity: 1;
}

.dock-divider {
  width: 1px;
  height: 38px;
  background: var(--surface-glass-border);
}

.fold-controls {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 16px;
}

.play-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  flex-shrink: 0;
  border: 0;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  cursor: pointer;
  box-shadow: 0 0 16px var(--accent-glow);
  transition: var(--transition-smooth);
}

.play-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 0 22px var(--accent-glow);
}

.play-btn:disabled {
  opacity: 0.4;
  cursor: wait;
}

.play-btn svg[hidden] {
  display: none !important;
}

.slider-wrapper {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.slider-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.fold-mode-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
}

.angle-badge {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent-light);
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 20px;
  display: block;
  margin: 0;
  background: transparent;
  cursor: ew-resize;
  touch-action: none;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  background: linear-gradient(to right, var(--accent) var(--progress, 100%), var(--track-bg) var(--progress, 100%));
  border-radius: 100px;
  transition: background 0.1s linear;
}

input[type="range"]::-moz-range-track {
  height: 6px;
  background: linear-gradient(to right, var(--accent) var(--progress, 100%), var(--track-bg) var(--progress, 100%));
  border-radius: 100px;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  margin-top: -6px;
  background: #ffffff;
  border: 3px solid var(--accent);
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s ease;
}

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

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: #ffffff;
  border: 3px solid var(--accent);
  border-radius: 50%;
}

/* ========================================================
   Drag and Drop Overlay
======================================================== */
.drop-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(12, 13, 18, 0.85);
  backdrop-filter: blur(16px);
  display: grid;
  place-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.drop-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.drop-modal {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 36px 48px;
  border: 2px dashed var(--accent);
  border-radius: 24px;
  color: var(--text-main);
  background: var(--surface-glass);
}

.drop-modal svg {
  color: var(--accent-light);
}

.drop-modal p {
  font-size: 14px;
  font-weight: 600;
}

/* ========================================================
   Responsive Breakpoints
======================================================== */
@media (max-width: 1024px) {
  .specs-drawer {
    top: auto;
    bottom: 120px;
    right: 16px;
    width: calc(100% - 32px);
    max-width: 320px;
    transform: translateX(30px);
    opacity: 0;
    pointer-events: none;
  }

  .specs-drawer.open {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
  }
}

@media (max-width: 860px) {
  .side-presets {
    top: 76px;
    width: 92%;
    gap: 8px;
  }
  .preset-group {
    width: auto;
    padding: 8px 10px;
  }
  .button-column {
    flex-direction: row;
    gap: 4px;
  }
  .group-label {
    display: none;
  }
  .preset-text {
    display: none;
  }
}

@media (max-width: 720px) {
  .studio-header {
    width: calc(100% - 24px);
    height: 48px;
    padding: 0 14px;
  }
  .brand-badge {
    display: none;
  }
  .icon-action-btn span {
    display: none;
  }
  .icon-action-btn {
    padding: 0 8px;
  }
  .control-dock {
    flex-direction: column;
    width: calc(100% - 24px);
    border-radius: 24px;
    padding: 14px;
    gap: 12px;
  }
  .dock-divider {
    display: none;
  }
  .ui-themes {
    width: 100%;
  }
  .ui-themes button {
    flex: 1;
    justify-content: center;
    padding: 8px 6px;
  }
  .fold-controls {
    width: 100%;
  }
}