:root {
  --bg: #020617;
  --panel: #111827;
  --accent: #6366f1;
  --border: #1e293b;
  --text: #e5e7eb;
  --card: #020617;
}

body.light {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --text: #111827;
  --card: #f9fafb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  display: flex;
  height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family:
    Segoe UI,
    Arial,
    sans-serif;
}

.sidebar {
  width: 260px;
  padding: 16px;
  background: linear-gradient(180deg, var(--panel), var(--card));
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: 0.3s ease;
}

.sidebar.collapsed {
  width: 60px;
}

.sidebar.collapsed h2,
.sidebar.collapsed .group,
.sidebar.collapsed .buttons {
  display: none;
}

#toggleSidebar {
  background: none;
  color: var(--text);
  font-size: 22px;
  border: none;
  cursor: pointer;
}

.sidebar h2 {
  text-align: center;
  color: var(--accent);
}

.group {
  background: var(--card);
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
}

.group label {
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  opacity: 0.8;
}

.group input,
.group select {
  width: 100%;
  padding: 6px;
  background: transparent;
  color: var(--text);
  border-radius: 6px;
  border: 1px solid var(--border);
  outline: none;
}

.group input:focus,
.group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.25);
}

.palette {
  display: flex;
  gap: 6px;
  margin-top: 6px;
  flex-wrap: wrap;
}

.palette div {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid #00000033;
}

.buttons {
  margin-top: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

button {
  padding: 8px;
  border-radius: 8px;
  border: none;
  background: #1f2937;
  color: white;
  cursor: pointer;
  transition: 0.2s ease;
}

body.light button {
  background: #e5e7eb;
  color: #111827;
}

button:hover {
  transform: translateY(-1px);
}

button.primary {
  grid-column: span 2;
  background: linear-gradient(135deg, #6366f1, #4338ca);
  color: white;
}

canvas {
  flex: 1;
  margin: 14px;
  background: white;
  border-radius: 14px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

#brushPreview {
  position: absolute;
  pointer-events: none;
  border: 2px solid var(--accent);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  display: none;
}