:root {
  --bg: #11161c;
  --panel: #1a2029;
  --panel-alt: #202836;
  --line: #313b4d;
  --text: #e7edf8;
  --muted: #9aa7bd;
  --accent: #62d6d6;
  --shadow: 0 10px 24px rgba(0, 0, 0, 0.3);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at 20% 0%, #1d2532 0%, #10141a 45%, #0b0f14 100%);
  color: var(--text);
}

.app-shell {
  min-height: 100vh;
  padding: 14px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 12px;
}

.app-header {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(180deg, #1d2430 0%, #171d27 100%);
  padding: 10px 12px;
  box-shadow: var(--shadow);
}

.app-header h1 {
  margin: 0;
  font-size: 1.08rem;
}

.app-header p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.layout {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 12px;
}

.viewer-panel,
.inspector {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.viewer-panel {
  padding: 10px;
  display: grid;
  grid-template-rows: 1fr auto;
  gap: 8px;
}

.viewer-canvas {
  min-height: 560px;
  border: 1px solid #3a4252;
  border-radius: 10px;
  background: radial-gradient(circle at 50% 15%, #31394c 0%, #191f2a 45%, #111821 100%);
  overflow: hidden;
}

.viewer-canvas canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.viewer-help {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.inspector {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.inspector h2,
.inspector h3 {
  margin: 0;
}

.inspector h2 {
  font-size: 1rem;
}

.inspector h3 {
  margin-top: 2px;
  font-size: 0.92rem;
  color: var(--muted);
}

.control-row {
  display: grid;
  gap: 6px;
}

.control-row span {
  font-size: 0.9rem;
}

input[type='range'] {
  width: 100%;
}

.button-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

button {
  border: 1px solid #3a4559;
  border-radius: 8px;
  background: #252f3f;
  color: var(--text);
  padding: 8px;
  cursor: pointer;
}

button:hover {
  background: #2b3749;
}

.control-toggle {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 0.9rem;
}

.parts-list {
  display: grid;
  gap: 6px;
  max-height: 380px;
  overflow: auto;
}

.part-item {
  border: 1px solid #3c4457;
  border-radius: 8px;
  padding: 6px 8px;
  background: var(--panel-alt);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px;
  align-items: center;
  cursor: pointer;
}

.part-item.is-active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(98, 214, 214, 0.35) inset;
}

.part-item span {
  font-size: 0.86rem;
}

.error-box {
  margin: 0;
  border: 1px solid #7c3f3f;
  border-radius: 8px;
  background: #332121;
  color: #ffd4d4;
  padding: 10px;
  font-size: 0.9rem;
}

.app-footer {
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
}

.app-footer a {
  color: inherit;
  text-decoration: none;
}

.app-footer a:hover {
  text-decoration: none;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .viewer-canvas {
    min-height: 420px;
  }

  .parts-list {
    max-height: 220px;
  }
}