:root {
  color-scheme: light;
  --bg: #f7f8fc;
  --panel: #ffffff;
  --text: #1a1f36;
  --muted: #56607a;
  --accent: #2359d1;
  --error: #b42318;
  --ok: #027a48;
  --border: #d6d9e2;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: linear-gradient(165deg, #eef2ff, #f8fafc);
  color: var(--text);
}

.app {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(280px, 360px) 1fr;
  gap: 1rem;
  padding: 1rem;
}

.controls {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
}

h1 {
  margin-top: 0;
  font-size: 1.4rem;
}

h2 {
  font-size: 1rem;
  margin: 1rem 0 0.5rem;
}

label,
.hint {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
}

input {
  width: 100%;
  margin-top: 0.35rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem;
  font-size: 1rem;
}

.button-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-top: 0.6rem;
}

button {
  border: 1px solid #1b4db8;
  background: var(--accent);
  color: white;
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  font-weight: 600;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.05);
}

.root-card {
  border-top: 1px solid var(--border);
  margin-top: 1rem;
  padding-top: 0.8rem;
}

.status {
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  border: 1px solid transparent;
}

.status.neutral {
  background: #eef3ff;
  border-color: #d4ddf7;
}

.status.error {
  background: #fef3f2;
  border-color: #fecdca;
  color: var(--error);
}

.status.success {
  background: #ecfdf3;
  border-color: #abefc6;
  color: var(--ok);
}

.plot-wrap {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.6rem;
  min-height: 0;
}

#plotCanvas {
  width: 100%;
  height: calc(100vh - 2.2rem);
  border-radius: 8px;
  border: 1px solid var(--border);
  background: white;
}

@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
  }

  #plotCanvas {
    height: 58vh;
  }
}