:root {
  --bg-base: #080c14;
  --bg-panel: rgba(15, 23, 42, 0.85);
  --bg-panel-hover: rgba(30, 41, 59, 0.95);
  --border-glass: rgba(255, 255, 255, 0.12);
  --border-active: #38bdf8;
  --accent-cyan: #38bdf8;
  --accent-pink: #ec4899;
  --accent-gold: #f59e0b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --blur-amt: 20px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
}

body, html {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-base);
  color: var(--text-main);
  font-family: var(--font-family);
}

#canvas-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.studio-ui {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.25rem;
}

.top-nav {
  pointer-events: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-panel);
  backdrop-filter: blur(var(--blur-amt));
  border: 1px solid var(--border-glass);
  padding: 0.5rem 1.25rem;
  border-radius: 999px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.05em;
  background: linear-gradient(135deg, #ffffff, var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.nav-center-toggles {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.action-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.main-workspace {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex: 1;
  position: relative;
  pointer-events: none;
  padding: 0.5rem 0;
}

.floating-pen-bar {
  pointer-events: auto;
  position: absolute;
  left: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-panel);
  backdrop-filter: blur(var(--blur-amt));
  border: 1px solid var(--border-glass);
  border-radius: 20px;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.6);
  z-index: 25;
}

.pen-icon-btn {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid transparent;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.2rem;
  position: relative;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.pen-icon-btn span {
  font-size: 0.55rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-top: 2px;
  letter-spacing: 0.02em;
}

.pen-icon-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-main);
  transform: scale(1.06);
}

.pen-icon-btn.active {
  background: rgba(56, 189, 248, 0.25);
  border-color: var(--accent-cyan);
  color: #ffffff;
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.5);
}

.pen-divider {
  width: 28px;
  height: 1px;
  background: rgba(255, 255, 255, 0.15);
  margin: 0.2rem 0;
}

.sidebar-wrapper {
  position: absolute;
  top: 1rem;
  bottom: 1rem;
  pointer-events: none;
  display: flex;
  align-items: center;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
  z-index: 30;
}

.left-sidebar-wrapper {
  left: 4.8rem; 
}

.right-sidebar-wrapper {
  right: 0.5rem;
}

.sidebar-wrapper.collapsed {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.95);
  visibility: hidden;
}

.tool-panel {
  pointer-events: auto;
  background: var(--bg-panel);
  backdrop-filter: blur(var(--blur-amt));
  border: 1px solid var(--border-glass);
  border-radius: 20px;
  padding: 1.25rem;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  max-height: calc(100vh - 160px);
  overflow-y: auto;
  width: 260px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 0.5rem;
}

.panel-title {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
}

.close-panel-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  transition: all 0.2s ease;
}

.close-panel-btn:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: #ef4444;
  color: #ffffff;
}

.section-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 0.45rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.4rem;
}

.btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  padding: 0.48rem 0.8rem;
  border-radius: 999px;
  font-family: inherit;
  font-size: 0.76rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
}

.btn.active {
  background: rgba(56, 189, 248, 0.2);
  border-color: var(--accent-cyan);
  color: #ffffff;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-pink));
  border: none;
  color: #ffffff;
  font-weight: 700;
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(236, 72, 153, 0.5);
  transform: translateY(-1px);
}

.color-swatches {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.4rem;
}

.color-swatch {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 8px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.color-swatch:hover {
  transform: scale(1.15);
}

.color-swatch.active {
  border-color: #ffffff;
  transform: scale(1.1);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.6);
}

.custom-color-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 0.4rem;
}

input[type="color"] {
  appearance: none;
  -webkit-appearance: none;
  border: none;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  cursor: pointer;
  background: none;
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

input[type="color"]::-webkit-color-swatch {
  border: 1px solid var(--border-glass);
  border-radius: 8px;
}

.slider-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
}

input[type="range"] {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 5px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.15);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-cyan);
  cursor: pointer;
  box-shadow: 0 0 10px var(--accent-cyan);
  transition: transform 0.15s ease;
}

.bottom-dock {
  pointer-events: auto;
  align-self: center;
  background: var(--bg-panel);
  backdrop-filter: blur(var(--blur-amt));
  border: 1px solid var(--border-glass);
  border-radius: 999px;
  padding: 0.45rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.dock-hint {
  font-size: 0.74rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.key-tag {
  background: rgba(255, 255, 255, 0.1);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.68rem;
  color: var(--text-main);
  font-weight: 700;
}

.depth-shortcuts {
  display: flex;
  gap: 0.35rem;
  margin-top: 0.35rem;
}

.mini-btn {
  flex: 1;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-glass);
  color: var(--text-muted);
  border-radius: 8px;
  padding: 0.28rem 0.4rem;
  font-size: 0.68rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.mini-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--text-main);
}

.mini-btn.active {
  background: rgba(56, 189, 248, 0.2);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.export-dropdown-wrapper {
  position: relative;
  display: inline-block;
}

.export-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--bg-panel);
  backdrop-filter: blur(var(--blur-amt));
  border: 1px solid var(--border-glass);
  border-radius: 12px;
  padding: 0.4rem;
  min-width: 180px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  z-index: 100;
}

.export-dropdown-menu.show {
  display: flex;
}

.export-item {
  background: transparent;
  border: none;
  color: var(--text-main);
  padding: 0.5rem 0.75rem;
  text-align: left;
  font-size: 0.8rem;
  font-family: inherit;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.export-item:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--accent-cyan);
}

body.zen-mode .top-nav,
body.zen-mode .floating-pen-bar,
body.zen-mode .sidebar-wrapper,
body.zen-mode .bottom-dock {
  opacity: 0 !important;
  pointer-events: none !important;
  transform: translateY(-20px) !important;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
#rotate-mode-btn { display: none; }

@media (pointer: coarse) {
  .top-nav, .floating-pen-bar, .action-bar, .nav-center-toggles {
    transform: scale(0.85);
  }
  .btn {
    padding: 0.6rem 1rem;
    font-size: 1rem;
  }
  #rotate-mode-btn { display: inline-block; }
}