:root {
  --wb-bg-1: #f4f7fb;
  --wb-bg-2: #e7eef8;
  --wb-toolbar-bg: rgba(255, 255, 255, 0.96);
  --wb-border: #c6d5eb;
  --wb-text: #20304a;
  --wb-muted: #5f7291;
  --wb-accent: #2367c9;
  --wb-accent-soft: #deebff;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
}

body {
  font-family: var(--tool-font-ui);
  color: var(--wb-text);
  background:
    radial-gradient(circle at 12% 8%, rgba(255, 255, 255, 0.8), transparent 34%),
    radial-gradient(circle at 88% 84%, rgba(163, 199, 255, 0.35), transparent 36%),
    linear-gradient(160deg, var(--wb-bg-1), var(--wb-bg-2));
}

.wb-app {
  height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr;
}

.wb-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--wb-border);
  background: var(--wb-toolbar-bg);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.wb-group {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.wb-group--colours {
  gap: 5px;
}

.wb-sep {
  width: 1px;
  height: 26px;
  background: var(--wb-border);
}

.wb-spacer {
  flex: 1;
}

.wb-btn {
  border: 1px solid var(--wb-border);
  border-radius: 999px;
  padding: 7px 12px;
  background: #fff;
  color: var(--wb-text);
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}

.wb-btn:hover {
  transform: translateY(-1px);
  border-color: #a4b8d6;
}

.wb-btn.is-active {
  background: var(--wb-accent-soft);
  border-color: var(--wb-accent);
  color: var(--wb-accent);
}

.wb-btn--primary {
  background: var(--wb-accent);
  border-color: var(--wb-accent);
  color: #fff;
}

.wb-btn--warn {
  color: #9d3b2d;
  border-color: #e4b5ab;
  background: #fff3f1;
}

.wb-swatch {
  width: 24px;
  height: 24px;
  border-radius: 999px;
  border: 2px solid rgba(0, 0, 0, 0.2);
  cursor: pointer;
}

.wb-swatch.is-active {
  outline: 2px solid var(--wb-accent);
  outline-offset: 1px;
}

.wb-canvas-area {
  padding: 10px;
  min-height: 0;
}

.wb-canvas {
  width: 100%;
  height: 100%;
  background:
    linear-gradient(to bottom, rgba(255, 255, 255, 0.98), rgba(255, 255, 255, 0.96)),
    repeating-linear-gradient(to right, rgba(180, 195, 221, 0.2) 0, rgba(180, 195, 221, 0.2) 1px, transparent 1px, transparent 40px),
    repeating-linear-gradient(to bottom, rgba(180, 195, 221, 0.2) 0, rgba(180, 195, 221, 0.2) 1px, transparent 1px, transparent 40px);
  border: 1px solid var(--wb-border);
  border-radius: 14px;
  box-shadow: 0 8px 24px rgba(18, 40, 76, 0.12);
  overflow: hidden;
}

@media (max-width: 860px) {
  .wb-toolbar {
    padding: 8px;
    gap: 6px;
  }

  .wb-sep,
  .wb-spacer {
    display: none;
  }

  .wb-canvas-area {
    padding: 6px;
  }

  .wb-canvas {
    border-radius: 10px;
  }
}