.tools-index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.tool-index-card {
  display: block;
  padding: 1.25rem;
  border: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.1));
  border-radius: var(--radius-md, 8px);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s;
}

.tool-index-card:hover {
  border-color: var(--accent, #76b900);
}

.tool-index-card h2 {
  font-size: 1.1rem;
  margin-bottom: 0.35rem;
}

.tool-lead {
  opacity: 0.8;
  margin-bottom: 1.25rem;
}

.tools-tool-page--full .container {
  max-width: min(1100px, 100%);
}

.tools-tool-page--euclidean-seq .container {
  max-width: min(720px, 100%);
}

.tools-tool-page--harmonic-hex .container {
  max-width: min(720px, 100%);
}

.tools-tool-page--voice-lab .container {
  max-width: min(960px, 100%);
}

.tools-euclidean-seq {
  margin-top: var(--space-2);
}

.tools-euclidean-seq-intro {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5);
  margin-bottom: var(--space-4);
  border-radius: calc(var(--radius-md) + 4px);
  border: 1px solid color-mix(in srgb, var(--color-accent, #76b900) 28%, var(--color-border-default, #2a2a2a));
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(118, 185, 0, 0.18), transparent 58%),
    linear-gradient(165deg, color-mix(in srgb, var(--color-bg-surface, #111) 88%, #000) 0%, var(--color-bg-surface, #111) 100%);
}

.tools-euclidean-seq-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent, #76b900);
}

.tools-euclidean-seq-start {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  border: none;
  cursor: pointer;
  font: inherit;
}

.tools-euclidean-seq-start:focus-visible {
  outline: 2px solid var(--color-accent, #76b900);
  outline-offset: 2px;
}