@layer base {
  strong.stress {
    font-weight: 700;
    color: var(--text);
  }

  /* REVEAL ANIMATION */
  .reveal {
    opacity: 0;
    transform: translateY(16px);
    transition:
      opacity 0.6s ease,
      transform 0.6s ease;
  }
  .reveal.visible {
    opacity: 1;
    transform: none;
  }

  /* CALLOUT */
  .callout {
    max-inline-size: 680px;
    padding: 24px 28px;
    margin: 36px auto;
    background: color-mix(in srgb, var(--gold) 6%, var(--bg));
    border-inline-start: 3px solid var(--gold);
    border-radius: 0 4px 4px 0;
  }
  .callout.violet {
    background: color-mix(in srgb, var(--violet) 5%, var(--bg));
    border-inline-start-color: var(--violet);
  }
  .callout.callout-gold {
    --callout-accent: var(--gold);
  }
  .callout-label {
    margin-block-end: 10px;
    font-family: var(--mono);
    font-size: 9px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.25em;
  }
  .callout p {
    margin: 0;
    font-size: 14px;
    line-height: 1.65;
    color: var(--text);
  }

  /* CASE STUDY */
  .case-study {
    max-inline-size: 680px;
    padding: 28px 32px 20px;
    margin: 36px auto;
    border: 1px solid var(--border);
    border-block-start: 2px solid var(--accent);
  }
  .case-study-label {
    margin-block-end: 10px;
    font-family: var(--mono);
    font-size: 9px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.25em;
  }
  .case-study h3 {
    margin-block-end: 14px;
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
  }
  .case-study p {
    margin-block-end: 1em;
    font-size: 14px;
    line-height: 1.65;
    color: var(--text);
  }
  .case-study p:last-of-type {
    margin-block-end: 0;
  }
  .callout.violet p {
    color: var(--text);
  }
  .mechanism {
    padding-block-start: 12px;
    margin-block-start: 16px;
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text-muted);
    letter-spacing: 0.1em;
    border-block-start: 1px solid var(--border);
  }
  .explore-row {
    text-align: center;
  }
  .mechanism::before {
    content: "Mechanism: ";
  }

  /* CROSSBAR */
  .crossbar-block {
    max-inline-size: 680px;
    padding: 32px;
    margin: 40px auto;
    background: var(--surface);
    border: 1px solid var(--border);
  }
  .crossbar-domains {
    display: flex;
    gap: 0;
    margin-block-end: 20px;
  }
  .crossbar-domain {
    flex: 1;
    padding: 16px 12px;
    text-align: center;
  }
  .crossbar-domain-note {
    margin-block-start: 6px;
    font-size: 12px;
    color: var(--text-muted);
  }
  .crossbar-domain-label {
    margin-block-end: 6px;
    font-family: var(--mono);
    font-size: 9px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.2em;
  }
  .crossbar-domain-name {
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
  }
  .crossbar-bridge {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 8px;
    font-family: var(--mono);
    font-size: 18px;
    color: var(--accent);
  }
  .crossbar-insight {
    padding-block-start: 16px;
    font-size: 14px;
    line-height: 1.65;
    color: var(--text);
    text-align: center;
    border-block-start: 1px solid var(--border);
  }

  /* CANVAS SECTION */
  .canvas-section {
    max-inline-size: 900px;
    margin: 40px auto;
  }
  .canvas-section canvas {
    display: block;
    inline-size: 100%;
    block-size: 280px;
    background: var(--surface);
    border: 1px solid var(--border);
  }
  .canvas-label {
    margin-block-start: 10px;
    font-family: var(--mono);
    font-size: 10px;
    line-height: 1.5;
    color: var(--text-dim);
    text-align: center;
    letter-spacing: 0.08em;
  }

  /* TERMINAL BLOCK */
  .terminal-block {
    max-inline-size: 680px;
    padding: 24px 28px;
    margin: 36px auto;
    font-family: var(--mono);
    font-size: 12px;
    line-height: 1.7;
    background: rgb(15 17 23);
    border: 1px solid rgb(42 45 53);
    border-radius: 4px;
  }
  .terminal-block .t-prompt {
    color: rgb(107 158 107);
  }
  .terminal-block .t-output {
    color: rgb(200 196 190);
  }
  .terminal-block .t-check-fail {
    color: rgb(140 74 74);
  }
  .terminal-block .t-check-pass {
    color: rgb(74 140 90);
  }
  .terminal-block .t-status {
    font-weight: 500;
    color: rgb(212 168 83);
  }
  .terminal-block .t-action {
    color: rgb(123 158 200);
  }
  .terminal-block .t-divider {
    margin: 16px 0;
    border: none;
    border-block-start: 1px solid rgb(42 45 53);
  }

  /* PRINCIPLE GRID */
  .principle-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    max-inline-size: 680px;
    margin: 36px auto;
    background: var(--border);
    border: 1px solid var(--border);
  }
  .principle-card {
    padding: 20px 22px;
    background: var(--bg);
  }
  .principle-card:nth-child(3),
  .principle-card:nth-child(4) {
    background: var(--surface);
  }
  .principle-header {
    padding-block-end: 8px;
    margin-block-end: 12px;
    font-family: var(--mono);
    font-size: 9px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    border-block-end: 1px solid var(--border);
  }
  .principle-card ul {
    padding: 0;
    margin: 0;
    list-style: none;
  }
  .principle-card li {
    padding: 5px 0;
    font-size: 13px;
    line-height: 1.5;
    color: var(--text);
    border-block-end: 1px solid var(--border);
  }
  .principle-card li:last-child {
    border-block-end: none;
  }
  .principle-card li::before {
    font-family: var(--mono);
    color: var(--text-dim);
    content: "· ";
  }
  .grpo-card {
    grid-column: 1;
  }
  .sft-card {
    grid-column: 2;
  }
  .grpo-card .principle-header {
    color: var(--violet-dim);
  }
  .sft-card .principle-header {
    color: var(--green);
  }
}