:root {
  color-scheme: light;
  --bg: #f6f7fb;
  --panel: #ffffff;
  --text: #1c1f2a;
  --muted: #6a7182;
  --primary: #2d6cdf;
  --border: #e1e5ef;
  --shadow: 0 18px 40px rgba(20, 26, 40, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 40px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  gap: 24px;
}

.app-header h1 {
  margin: 0 0 4px;
  font-size: 24px;
}

.app-header p {
  margin: 0;
  color: var(--muted);
}

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

button {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 10px 16px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
}

button.primary {
  background: var(--primary);
  border-color: transparent;
  color: white;
}

button:hover {
  filter: brightness(0.98);
}

.app-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  padding: 24px 40px 40px;
}

.panel,
.workspace {
  background: var(--panel);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 20px;
  border: 1px solid var(--border);
}

.panel h2 {
  margin-top: 0;
}

.library-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.tile-form {
  display: grid;
  gap: 12px;
}

.tile-form label {
  display: grid;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

.tile-form input[type="text"],
.tile-form input[type="number"],
.tile-form input[type="color"],
.tile-form input[type="file"],
.tile-form select {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 14px;
}

.active-tile {
  margin: 20px 0 12px;
  padding: 12px;
  border: 1px dashed var(--border);
  border-radius: 12px;
  display: grid;
  gap: 6px;
}

.active-preview {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: repeating-linear-gradient(45deg, #f1f2f7, #f1f2f7 10px, #e8eaf2 10px, #e8eaf2 20px);
}

.tile-list {
  display: grid;
  gap: 12px;
  max-height: 420px;
  overflow: auto;
  padding-right: 6px;
}

.tile-card {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 10px;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.tile-swatch {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background-size: cover;
  background-position: center;
}

.tile-meta {
  display: grid;
  gap: 4px;
}

.tile-meta span {
  font-size: 12px;
  color: var(--muted);
}

.tile-actions {
  display: grid;
  gap: 6px;
}

.workspace {
  display: grid;
  gap: 20px;
}

.controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.control-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: flex-end;
}

.control-group label {
  display: grid;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
}

.control-group input {
  width: 120px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.control-group select {
  width: 180px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: white;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
}

.checkbox input {
  width: 16px;
  height: 16px;
}

.control-actions {
  display: flex;
  gap: 8px;
}

.control-tip {
  font-size: 12px;
  color: var(--muted);
}

.canvas-wrap {
  background: #fefefe;
  border-radius: 16px;
  border: 1px solid var(--border);
  padding: 16px;
  display: grid;
  justify-content: start;
}

#pattern-canvas {
  border-radius: 12px;
  background: #ffffff;
  border: 1px solid var(--border);
}

.json-panel {
  display: grid;
  gap: 10px;
}

.json-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

#pattern-json {
  width: 100%;
  min-height: 160px;
  border-radius: 12px;
  padding: 12px;
  border: 1px solid var(--border);
  font-family: "Consolas", "Courier New", monospace;
  font-size: 12px;
  background: #f9fafc;
}

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