:root {
  --library-rail: minmax(320px, 420px);
}

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

.library-shell {
  display: grid;
  grid-template-columns: var(--library-rail) minmax(0, 1fr);
  min-height: 100vh;
}

.library-rail {
  padding: var(--space-lg);
  color: #ffffff;
  background: var(--color-navy);
}

.rail-header {
  margin-bottom: var(--space-lg);
}

.rail-header h1 {
  max-width: none;
  color: #ffffff;
  font-size: 2rem;
}

.library-rail .course-label,
.library-rail h2 {
  color: #ffffff;
}

.library-rail h2 {
  margin-top: var(--space-lg);
  font-size: 1.05rem;
}

.library-label {
  display: block;
  margin-bottom: 0.35rem;
  color: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.library-rail input {
  width: 100%;
  min-height: 2.5rem;
  padding: 0.6rem 0.75rem;
  color: var(--color-text);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-md);
}

.library-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.snippet-columns {
  margin-top: var(--space-md);
}

.library-list {
  display: grid;
  gap: 0.7rem;
}

.library-item {
  display: block;
  width: 100%;
  padding: 0.8rem;
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-md);
  text-align: left;
}

.library-item:hover,
.library-item.is-active {
  background: rgba(255, 255, 255, 0.16);
}

.library-item-title {
  display: block;
  margin-bottom: 0.25rem;
  font-weight: 700;
}

.library-item-meta {
  display: block;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.78rem;
  line-height: 1.4;
}

.builder-panel {
  padding: var(--space-xl);
  background: var(--color-bg);
}

.builder-heading {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
  align-items: flex-start;
  margin-bottom: var(--space-lg);
}

.builder-heading h2 {
  margin-bottom: 0;
}

.builder-badge {
  padding: 0.25rem 0.65rem;
  color: var(--color-navy);
  background: var(--color-cta);
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 700;
}

.config-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.form-row,
.toggle-row {
  padding: var(--space-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.form-row input,
.form-row select,
.form-row textarea {
  width: 100%;
  min-height: 2.5rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font: inherit;
}

.form-row textarea {
  min-height: 6rem;
  resize: vertical;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.toggle-row input {
  width: 1.1rem;
  height: 1.1rem;
}

.toggle-row label {
  color: var(--color-navy);
  font-weight: 700;
}

.code-preview {
  width: 100%;
  min-height: 22rem;
  padding: var(--space-sm);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.82rem;
  line-height: 1.5;
  resize: vertical;
}

.library-status {
  min-height: 1.25rem;
  margin-top: var(--space-sm);
  color: var(--color-muted);
  font-size: 0.9rem;
}

.library-status.is-error {
  color: var(--color-danger);
}

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

  .library-rail,
  .builder-panel {
    padding: var(--space-md);
  }
}