:root {
  --bg: #f4f0e6;
  --bg-deep: #ebe2d0;
  --ink: #1c1a17;
  --muted: #5f5a53;
  --accent: #e4572e;
  --accent-deep: #c0441f;
  --panel: rgba(255, 255, 255, 0.85);
  --panel-border: #d7c9b4;
  --grid: rgba(73, 63, 51, 0.15);
  --grid-strong: rgba(73, 63, 51, 0.28);
  --shadow: 0 18px 40px rgba(25, 18, 10, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top left, #fff3d6 0%, var(--bg) 45%, var(--bg-deep) 100%);
  min-height: 100vh;
}

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

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  background: rgba(255, 255, 255, 0.8);
  border-bottom: 1px solid var(--panel-border);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(140deg, var(--accent), #ff9f68);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 20px;
  font-weight: 700;
  box-shadow: var(--shadow);
}

.brand-title {
  font-weight: 600;
  font-size: 18px;
}

.brand-sub {
  color: var(--muted);
  font-size: 13px;
}

.topbar-actions {
  display: flex;
  gap: 12px;
}

button {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 10px 18px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
  box-shadow: none;
}

button.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow);
}

button.primary:hover {
  background: var(--accent-deep);
}

button.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--panel-border);
}

.workspace {
  display: grid;
  grid-template-columns: 220px 1fr 320px;
  gap: 20px;
  padding: 24px 32px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  padding: 18px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.panel-title {
  font-weight: 600;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.tools .tool {
  text-align: left;
  background: #fff;
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  padding: 10px 12px;
  font-size: 14px;
}

.tools .tool.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.divider {
  height: 1px;
  background: var(--panel-border);
  margin: 8px 0;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--muted);
}

.canvas-wrap {
  position: relative;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 24px;
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow);
  overflow: hidden;
}

#diagram-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.hint {
  position: absolute;
  left: 24px;
  bottom: 24px;
  background: rgba(28, 26, 23, 0.85);
  color: #fff;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 12px;
  pointer-events: none;
}

.inspector .field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

.inspector .field.inline {
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.inspector input,
.inspector select {
  font-family: "IBM Plex Mono", monospace;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 8px 10px;
  background: #fff;
  color: var(--ink);
  min-width: 80px;
}

.muted {
  color: var(--muted);
  font-size: 13px;
}

.hidden {
  display: none;
}

.bottombar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px 24px;
}

.bottombar-actions {
  display: flex;
  gap: 12px;
}

.status {
  font-size: 13px;
  color: var(--muted);
}

@media (max-width: 1100px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .tools,
  .inspector {
    order: 2;
  }

  .canvas-wrap {
    min-height: 480px;
  }
}