:root {
  color-scheme: light;
  font-family: Arial, Helvetica, sans-serif;
  --bg: #f4f7fb;
  --panel: #ffffff;
  --text: #172033;
  --muted: #687385;
  --line: #d8e0ea;
  --primary: #1f6feb;
  --primary-dark: #174ea6;
  --danger: #dc2626;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

button,
select,
input {
  font: inherit;
}

button,
.file-button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  border-radius: 6px;
  padding: 0.55rem 0.75rem;
  cursor: pointer;
}

button:hover,
.file-button:hover {
  border-color: var(--primary);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.topbar {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem 1rem;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

.topbar strong {
  display: block;
  font-size: 1.1rem;
}

.topbar span {
  color: var(--muted);
  font-size: 0.9rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.file-button input {
  display: none;
}

.workspace {
  display: grid;
  grid-template-columns: 300px 1fr;
  min-height: calc(100vh - 64px);
}

.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: 1rem;
  overflow-y: auto;
}

.sidebar section + section {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.sidebar h2 {
  margin: 0 0 0.75rem;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.tool-grid button.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

label {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
}

input,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.55rem;
  color: var(--text);
  background: #fff;
}

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

.checkbox input {
  width: auto;
}

.sidebar section button {
  width: 100%;
  margin-bottom: 0.5rem;
}

.canvas-panel {
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
}

.statusbar {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.6rem 1rem;
  color: var(--muted);
  background: #eef3f9;
  border-bottom: 1px solid var(--line);
  font-size: 0.9rem;
}

canvas {
  display: block;
  width: 100%;
  height: calc(100vh - 106px);
  background: #fbfdff;
  cursor: crosshair;
}

.entity-list {
  display: grid;
  gap: 0.5rem;
  max-height: 330px;
  overflow-y: auto;
}

.entity-list.empty {
  color: var(--muted);
  font-size: 0.9rem;
}

.entity-item {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.55rem;
  background: #fff;
}

.entity-item.selected {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(31, 111, 235, 0.16);
}

.entity-item strong {
  display: block;
  text-transform: capitalize;
}

.entity-item span {
  color: var(--muted);
  font-size: 0.85rem;
}

.layer-create {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.layer-create button {
  width: auto;
  margin: 0;
}

.layer-list {
  display: grid;
  gap: 0.5rem;
}

.layer-item {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 0.45rem;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.5rem;
  background: #fff;
}

.layer-item.active {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(31, 111, 235, 0.12);
}

.layer-item input[type="color"] {
  width: 32px;
  min-height: 32px;
  padding: 0;
}

.layer-item button {
  margin: 0;
  text-align: left;
}

.layer-item label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin: 0;
  font-size: 0.8rem;
}

.property-panel {
  display: grid;
  gap: 0.65rem;
}

.property-panel.empty {
  color: var(--muted);
  font-size: 0.9rem;
}

.property-panel strong {
  text-transform: capitalize;
}

.property-panel span {
  color: var(--muted);
  font-size: 0.9rem;
}

.danger {
  border-color: rgba(220, 38, 38, 0.35);
  color: var(--danger);
}

@media (max-width: 900px) {
  .topbar,
  .workspace {
    display: block;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .statusbar {
    flex-wrap: wrap;
  }

  canvas {
    height: 70vh;
  }
}