:root {
  --bg-color: #0f141c;
  --panel-bg: rgba(22, 28, 39, 0.88);
  --panel-border: rgba(255, 255, 255, 0.1);
  --panel-shadow: 0 12px 36px -8px rgba(0, 0, 0, 0.6), 0 0 1px 1px rgba(255, 255, 255, 0.08);
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-glow: rgba(56, 189, 248, 0.3);
  --danger: #ef4444;
  --success: #22c55e;
  --radius-lg: 14px;
  --radius-md: 10px;
  --radius-sm: 8px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

body, html {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-color);
  font-family: var(--font-sans);
  color: var(--text-main);
  font-size: 15px;
}

/* Background Canvas */
#board {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  z-index: 1;
  cursor: crosshair;
}

#board.select-mode {
  cursor: default;
}

#board.panning {
  cursor: grab;
}

#board.is-panning {
  cursor: grabbing;
}

#board.text-mode {
  cursor: text;
}

/* Header / Top Navigation */
.top-bar {
  position: fixed;
  top: 16px;
  left: 20px;
  right: 20px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 10;
  pointer-events: none;
}

.brand {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  padding: 8px 16px;
  border-radius: var(--radius-lg);
  box-shadow: var(--panel-shadow);
}

.brand-icon {
  font-size: 22px;
}

.brand-title {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: #fff;
}

.room-section {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.room-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  padding: 8px 14px;
  border-radius: var(--radius-lg);
  box-shadow: var(--panel-shadow);
  font-size: 14px;
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--success);
  box-shadow: 0 0 10px var(--success);
  transition: background-color 0.3s;
}

.status-dot.disconnected {
  background-color: var(--danger);
  box-shadow: 0 0 10px var(--danger);
}

.room-label {
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
}

.room-name {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.04em;
  font-size: 15px;
}

.btn-icon {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  transition: background 0.15s, transform 0.1s;
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.16);
}

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

.users-badge {
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  padding: 8px 14px;
  border-radius: var(--radius-lg);
  box-shadow: var(--panel-shadow);
  font-size: 14px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
}

.users-badge #user-count {
  font-weight: 700;
  color: var(--text-main);
  font-size: 15px;
}

.actions-section {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--panel-shadow);
}

.btn svg {
  width: 16px;
  height: 16px;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: #2563eb;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  background: #1d4ed8;
}

.btn-secondary {
  background: var(--panel-bg);
  color: var(--text-main);
  border: 1px solid var(--panel-border);
}

.btn-secondary:hover {
  background: rgba(35, 45, 62, 0.95);
  color: #fff;
}

.btn-danger-outline {
  background: var(--panel-bg);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.35);
  padding: 9px 12px;
}

.btn-danger-outline:hover {
  background: rgba(239, 68, 68, 0.2);
  color: #ef4444;
}

/* Floating Palette (Bottom Center) */
.floating-palette {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--panel-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  padding: 9px 16px;
  box-shadow: var(--panel-shadow);
}

.tool-group, .color-group, .size-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.tool-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tool-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.08);
}

.tool-btn.active {
  background: var(--accent);
  color: #0f172a;
  box-shadow: 0 0 14px var(--accent-glow);
}

.palette-divider {
  width: 1px;
  height: 28px;
  background: var(--panel-border);
}

/* Color Swatches */
.color-swatch {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: var(--swatch-color);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s;
}

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

.color-swatch.active {
  transform: scale(1.22);
  border-color: #ffffff;
  box-shadow: 0 0 10px var(--swatch-color);
}

/* Stroke Sizes */
.size-btn {
  background: transparent;
  border: 1px solid transparent;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.size-dot {
  background-color: var(--text-muted);
  border-radius: 50%;
  transition: background-color 0.15s, transform 0.15s;
}

.size-btn:hover .size-dot {
  background-color: var(--text-main);
}

.size-btn.active {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--panel-border);
}

.size-btn.active .size-dot {
  background-color: var(--accent);
}

/* Minimap Widget (Bottom Right) */
.minimap-panel {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 10;
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--panel-shadow);
  overflow: hidden;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.minimap-header {
  padding: 4px 10px;
  background: rgba(0, 0, 0, 0.25);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.minimap-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

#minimap {
  display: block;
  width: 180px;
  height: 110px;
  background: #0b0f16;
  cursor: crosshair;
}

/* Bottom Information Tip (Bottom Left) */
.bottom-info {
  position: fixed;
  bottom: 24px;
  left: 24px;
  z-index: 10;
  font-size: 13px;
  color: var(--text-muted);
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(12px);
  border: 1px solid var(--panel-border);
  padding: 8px 14px;
  border-radius: var(--radius-lg);
  pointer-events: none;
  box-shadow: var(--panel-shadow);
}

.bottom-info kbd {
  background: rgba(255, 255, 255, 0.14);
  border-radius: 4px;
  padding: 2px 5px;
  font-family: var(--font-mono);
  font-size: 12px;
}

/* Toast Notification */
.toast {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: rgba(30, 41, 59, 0.96);
  backdrop-filter: blur(12px);
  border: 1px solid var(--panel-border);
  color: #fff;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.25s ease, opacity 0.25s ease;
  z-index: 100;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* In-place Textarea overlay for typing on canvas */
.canvas-text-editor {
  position: absolute;
  z-index: 5;
  background: transparent;
  border: 1px dashed var(--accent);
  outline: none;
  resize: none;
  overflow: hidden;
  font-family: var(--font-sans);
  font-weight: 500;
  line-height: 1.25;
  padding: 2px 4px;
  white-space: pre-wrap;
  word-break: break-word;
}

/* Responsive adjustment */
@media (max-width: 1024px) {
  .bottom-info {
    display: none;
  }
}

@media (max-width: 768px) {
  .top-bar {
    flex-wrap: wrap;
    height: auto;
    gap: 8px;
  }
  .actions-section {
    width: 100%;
    justify-content: flex-end;
  }
  .floating-palette {
    bottom: 12px;
    padding: 6px 10px;
    gap: 8px;
  }
  .minimap-panel {
    display: none;
  }
}