:root {
  font-family: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", "PingFang SC", "Helvetica Neue", sans-serif;
  color: #0c1a21;
  background-color: #f1f4f6;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  --bg: #f1f4f6;
  --card: #ffffff;
  --ink: #0c1a21;
  --muted: #5c6b73;
  --accent: #1f7a8c;
  --accent-strong: #0b4f5a;
  --shadow: 0 22px 60px rgba(12, 26, 33, 0.12);
  --border: rgba(12, 26, 33, 0.08);
  --gradient: radial-gradient(circle at top left, #e6f1f6 0%, #f7efe3 45%, #f1f4f6 100%);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--gradient);
}

#app {
  min-height: 100vh;
}

.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 32px 40px 24px;
  gap: 24px;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand-badge {
  background: #0b4f5a;
  color: #f1f6f8;
  padding: 12px 16px;
  border-radius: 16px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand h1 {
  margin: 0;
  font-size: 26px;
}

.brand p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
}

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

.app-main {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
  gap: 20px;
  align-items: stretch;
}

.workspace-panel,
.side-panel {
  background: var(--card);
  border-radius: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 22px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(31, 122, 140, 0.08), rgba(255, 255, 255, 0.8));
}

.panel-head h2 {
  margin: 0;
  font-size: 18px;
}

.panel-head p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.workspace-stage {
  flex: 1;
  min-height: 640px;
}

.code-preview {
  flex: 1;
  margin: 0;
  padding: 20px;
  background: #0b1f24;
  color: #d3f5ff;
  font-family: "Source Code Pro", "JetBrains Mono", Menlo, monospace;
  font-size: 13px;
  line-height: 1.6;
  overflow: auto;
}

.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: #0f2a31;
  color: #c7dfe5;
  font-size: 12px;
}

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

.output-label {
  padding: 10px 18px;
  font-size: 12px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  background: rgba(31, 122, 140, 0.06);
}

.output-preview {
  flex: 0 0 160px;
  background: #0a1519;
  color: #d7f1f6;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.btn {
  border: 0;
  border-radius: 999px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn.primary {
  background: var(--accent);
  color: #fefefe;
  box-shadow: 0 12px 30px rgba(31, 122, 140, 0.25);
}

.btn.primary:hover {
  transform: translateY(-1px);
}

.btn.ghost {
  background: rgba(31, 122, 140, 0.1);
  color: var(--accent-strong);
}

.btn.subtle {
  background: rgba(255, 255, 255, 0.18);
  color: #e3f4f8;
  padding: 6px 12px;
  font-size: 12px;
}

.app-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
  font-size: 13px;
  padding: 0 4px;
}

.footer-pill {
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(31, 122, 140, 0.12);
  color: var(--accent-strong);
  font-weight: 600;
}

.blocklyToolboxCategory {
  height: 40px;
  line-height: 30px;
}

@media (max-width: 980px) {
  .app-shell {
    padding: 20px;
  }

  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-actions {
    flex-wrap: wrap;
  }

  .app-main {
    grid-template-columns: 1fr;
  }

  .workspace-stage {
    min-height: 520px;
  }

  .app-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}