@layer components {

  /* ── Base ────────────────────────────────────────────────────────── */

  .title-block {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    border: 2px solid var(--color-neutral-900);
    background: var(--color-surface-primary);
    max-width: 640px;
    width: 100%;
  }

  /* ── Main (left: project name + drawing title) ──────────────────── */

  .title-block-main {
    grid-column: 1;
    grid-row: 1 / -1;
    padding: var(--space-4) var(--space-5);
    border-right: 2px solid var(--color-neutral-900);
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--space-1);
  }

  .title-block-name {
    font-family: var(--font-serif);
    font-size: var(--text-lg);
    font-weight: 700;
    line-height: var(--leading-tight);
    color: var(--color-neutral-900);
  }

  .title-block-title {
    font-family: var(--font-serif);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-text-secondary);
  }

  /* ── Meta (right: 2-column field grid) ──────────────────────────── */

  .title-block-meta {
    grid-column: 2;
    grid-row: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-width: 280px;
  }

  .title-block-field {
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--color-border-default);
    border-left: 1px solid var(--color-border-default);
    display: flex;
    flex-direction: column;
    gap: 1px;
  }

  .title-block-field:nth-child(odd) {
    border-left: none;
  }

  .title-block-field:nth-last-child(-n+2) {
    border-bottom: none;
  }

  .title-block-label {
    font-family: var(--font-sans);
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    line-height: var(--leading-normal);
  }

  .title-block-value {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--color-text-primary);
    line-height: var(--leading-normal);
  }

  /* ── Footer (bottom-right: sheet/revision badges) ───────────────── */

  .title-block-footer {
    grid-column: 2;
    grid-row: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-top: 2px solid var(--color-neutral-900);
  }

  .title-block-badge {
    padding: var(--space-2) var(--space-3);
    display: flex;
    flex-direction: column;
    gap: 1px;
  }

  .title-block-badge + .title-block-badge {
    border-left: 1px solid var(--color-border-default);
  }

  .title-block-badge-label {
    font-family: var(--font-sans);
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  .title-block-badge-value {
    font-family: var(--font-mono);
    font-size: var(--text-md);
    font-weight: 700;
    color: var(--color-neutral-900);
    line-height: var(--leading-tight);
  }

  /* ── Compact variant ────────────────────────────────────────────── */

  .title-block-compact {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    max-width: 400px;
  }

  .title-block-compact .title-block-main {
    grid-column: 1;
    grid-row: 1;
    border-right: none;
    border-bottom: 2px solid var(--color-neutral-900);
    padding: var(--space-3) var(--space-4);
  }

  .title-block-compact .title-block-meta {
    grid-column: 1;
    grid-row: 2;
    min-width: unset;
  }

  .title-block-compact .title-block-field:nth-child(odd) {
    border-left: none;
  }

  .title-block-compact .title-block-field:nth-child(even) {
    border-left: 1px solid var(--color-border-default);
  }

  .title-block-compact .title-block-footer {
    grid-column: 1;
    grid-row: 3;
  }
}