@layer base {
  [data-accent="red"] {
    border-block-start: 1px solid rgba(232, 93, 93, 0.1);
  }
  [data-accent="coral"] .section-number {
    color: var(--coral-alive);
  }
  [data-accent="coral"] h2 em {
    color: var(--coral-alive);
  }

  .tempo-jo {
    background: var(--bg);
  }
  .tempo-ha {
    background: linear-gradient(180deg, var(--bg), rgba(14, 16, 23, 1), var(--bg));
  }
  .void-section {
    background: linear-gradient(180deg, var(--bg), rgba(107, 79, 143, 0.06), var(--bg));
  }

  /* ── Callouts ── */
  .callout {
    max-inline-size: 680px;
    padding: 1.5rem 2rem;
    margin: 2.5rem auto;
    background: var(--gold-glow);
    border-inline-start: 3px solid var(--gold);
    border-radius: 0 6px 6px 0;
  }
  .callout.violet {
    background: var(--violet-dim);
    border-inline-start-color: var(--violet);
  }
  .callout.cyan {
    background: var(--cyan-dim);
    border-inline-start-color: var(--cyan);
  }
  .callout.red {
    background: var(--red-dim);
    border-inline-start-color: var(--red);
  }
  .callout.green {
    background: var(--green-dim);
    border-inline-start-color: var(--green);
  }
  .callout-label {
    margin-block-end: 0.5rem;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.6rem;
    font-weight: 500;
    color: var(--gold);
    text-transform: uppercase;
    letter-spacing: 0.18em;
  }
  .callout.violet .callout-label {
    color: var(--violet);
  }
  .callout.cyan .callout-label {
    color: var(--cyan);
  }
  .callout.red .callout-label {
    color: var(--red);
  }
  .callout.green .callout-label {
    color: var(--green);
  }
  .callout p {
    margin-block-end: 0;
    font-size: 0.95rem;
    line-height: 1.65;
  }

  /* ── Crossbar ── */
  .crossbar-block {
    max-inline-size: 740px;
    padding: 3rem;
    margin: 3rem auto;
    text-align: center;
    background: linear-gradient(135deg, rgba(212, 168, 83, 0.04), rgba(155, 114, 207, 0.04));
    border: 1px solid rgba(212, 168, 83, 0.15);
    border-radius: 10px;
  }
  .crossbar-label {
    margin-block-end: 1rem;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.6rem;
    color: var(--gold);
    text-transform: uppercase;
    letter-spacing: 0.22em;
  }
  .crossbar-endpoints {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: center;
    justify-content: center;
    margin-block-end: 2rem;
  }
  .crossbar-endpoint {
    min-inline-size: 200px;
    padding: 1.2rem 1.8rem;
    background: var(--bg);
    border-radius: 8px;
  }
  .crossbar-endpoint .ep-domain {
    margin-block-end: 0.3rem;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.58rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
  }
  .crossbar-endpoint:first-child .ep-domain {
    color: var(--cyan);
  }
  .crossbar-endpoint:last-child .ep-domain {
    color: var(--violet);
  }
  .crossbar-endpoint .ep-name {
    font-family: "Fraunces", serif;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--bright);
  }
  .crossbar-bridge {
    font-family: "Fraunces", serif;
    font-size: 1.5rem;
    color: var(--gold-dim);
  }
  .crossbar-insight {
    max-inline-size: 560px;
    margin: 0 auto;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--bright);
    text-align: start;
  }

  /* ── Case Study ── */
  .case-study {
    max-inline-size: 680px;
    padding: 2rem;
    margin: 2.5rem auto;
    background: var(--bg-raised);
    border-inline-start: 3px solid var(--cyan);
    border-radius: 0 6px 6px 0;
  }
  .case-study-label {
    margin-block-end: 0.75rem;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.58rem;
    font-weight: 500;
    color: var(--cyan);
    text-transform: uppercase;
    letter-spacing: 0.18em;
  }
  .case-study h3 {
    margin-block-end: 0.75rem;
    font-family: "Fraunces", serif;
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.3;
    color: var(--bright);
  }
  .case-study p {
    margin-block-end: 0.75rem;
    font-size: 0.9rem;
    line-height: 1.6;
  }
  .case-study p:last-child {
    margin-block-end: 0;
  }
  .case-study .mechanism-tag {
    padding-block-start: 0.75rem;
    margin-block-start: 0.75rem;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.58rem;
    font-weight: 500;
    color: var(--gold-dim);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    border-block-start: 1px solid rgba(212, 168, 83, 0.12);
  }

  /* ── Mechanism Cards ── */
  .mech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.2rem;
    max-inline-size: 900px;
    padding: 0 2rem;
    margin: 2.5rem auto;
  }
  .mech-card {
    padding: 1.5rem;
    background: var(--bg-raised);
    border-block-start: 2px solid var(--gold-dim);
    border-radius: 8px;
    transition:
      border-color 0.3s,
      transform 0.3s;
  }
  .mech-card:hover {
    border-block-start-color: var(--gold);
    transform: translateY(-2px);
  }
  .mech-grid .mech-card.mech-green {
    border-block-start-color: var(--green);
  }
  .mech-grid .mech-card.mech-red {
    border-block-start-color: var(--red);
  }
  .mech-grid .mech-card .m-role.role-green {
    color: var(--green);
  }
  .mech-grid .mech-card .m-role.role-red {
    color: var(--red);
  }
  .btn-center {
    text-align: center;
  }
  .mech-card .m-role {
    margin-block-end: 0.4rem;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.55rem;
    font-weight: 500;
    color: var(--gold-dim);
    text-transform: uppercase;
    letter-spacing: 0.18em;
  }
  .mech-card h4 {
    margin-block-end: 0.5rem;
    font-family: "Fraunces", serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--bright);
  }
  .mech-card p {
    margin: 0;
    font-size: 0.82rem;
    line-height: 1.55;
  }
  .mech-card .m-coupling {
    margin-block-start: 0.6rem;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.55rem;
    color: var(--dim);
  }

  /* ── Canvas ── */
  .canvas-wrap {
    inline-size: 100%;
    padding: 2rem 0;
  }
  .canvas-wrap canvas {
    display: block;
    inline-size: 100%;
    max-inline-size: 900px;
    block-size: 360px;
    margin: 0 auto;
  }
  .canvas-label {
    margin-block-start: 0.75rem;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.58rem;
    color: var(--gold-dim);
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.15em;
  }
  .animation-description {
    max-inline-size: 680px;
    padding: 0 2rem;
    margin: 0.75rem auto 0;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.75rem;
    line-height: 1.6;
    color: var(--dim);
    text-align: center;
  }
}