@layer base {
  * {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
  }

  :root {
    --bg: rgb(8 9 12);
    --bg-raised: rgb(14 16 23);
    --text: rgb(196 200 212);
    --text-bright: rgb(232 234 240);
    --gold: rgb(212 168 83);
    --gold-dim: rgb(154 122 61);
    --cyan: rgb(78 205 196);
    --green: rgb(123 196 127);
    --red: rgb(232 93 93);
    --violet: rgb(155 114 207);
    --violet-dim: rgb(107 79 143);
    --amber-glow: rgba(212, 168, 83, 0.08);
    --display: "Fraunces", serif;
    --body: "Source Serif 4", serif;
    --mono: "IBM Plex Mono", monospace;
  }

  html {
    scroll-behavior: smooth;
  }
  body {
    overflow-x: hidden;
    font-family: var(--body);
    font-size: 18px;
    font-optical-sizing: auto;
    line-height: 1.72;
    color: var(--text);
    background: var(--bg);
  }

  .prose {
    max-inline-size: 680px;
    padding: 0 2rem;
    margin: 0 auto;
  }

  /* HERO */
  .hero {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-block-size: 100vh;
    overflow: hidden;
  }

  .hero canvas {
    position: absolute;
    inset-block-start: 0;
    inset-inline-start: 0;
    z-index: 0;
    inline-size: 100%;
    block-size: 100%;
  }

  .hero-content {
    position: relative;
    z-index: 1;
    max-inline-size: 800px;
    padding: 2rem;
    text-align: center;
  }

  .hero-label {
    margin-block-end: 1.5rem;
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 400;
    color: var(--gold-dim);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    opacity: 0;
    animation: fadeUp 1s 0.3s forwards;
  }

  .hero h1 {
    margin-block-end: 1.5rem;
    font-family: var(--display);
    font-size: clamp(2.4rem, 6vw, 4.2rem);
    font-weight: 800;
    line-height: 1.12;
    color: var(--text-bright);
    opacity: 0;
    animation: fadeUp 1s 0.6s forwards;
  }

  .hero h1 em {
    font-style: italic;
    color: var(--gold);
  }

  .hero-sub {
    max-inline-size: 560px;
    margin: 0 auto;
    font-family: var(--body);
    font-size: 1.15rem;
    line-height: 1.7;
    color: var(--text);
    opacity: 0;
    animation: fadeUp 1s 0.9s forwards;
  }

  @keyframes fadeUp {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* SECTIONS */
  section {
    position: relative;
    padding: 5rem 2rem;
  }

  section .section-number {
    margin-block-end: 0.5rem;
    font-family: var(--mono);
    font-size: 0.68rem;
    font-weight: 500;
    color: var(--gold-dim);
    text-transform: uppercase;
    letter-spacing: 0.22em;
  }

  section h2 {
    margin-block-end: 2rem;
    font-family: var(--display);
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-bright);
  }

  section p {
    max-inline-size: 680px;
    margin: 0 auto 1.5rem;
  }

  section p + p {
    margin-block-start: 0;
  }

  /* CALLOUT */
  .callout {
    max-inline-size: 680px;
    padding: 1.5rem 2rem;
    margin: 2.5rem auto;
    background: var(--amber-glow);
    border-inline-start: 3px solid var(--gold);
    border-radius: 0 6px 6px 0;
  }

  .callout.violet {
    background: rgba(155, 114, 207, 0.06);
    border-inline-start-color: var(--violet);
  }

  .callout.cyan {
    background: rgba(78, 205, 196, 0.06);
    border-inline-start-color: var(--cyan);
  }

  .callout-label {
    margin-block-end: 0.5rem;
    font-family: var(--mono);
    font-size: 0.65rem;
    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 p {
    margin-block-end: 0;
    font-size: 0.95rem;
    line-height: 1.65;
  }

  /* CASE STUDY */
  .case-study {
    max-inline-size: 720px;
    padding: 2rem 2.5rem;
    margin: 3rem auto;
    background: var(--bg-raised);
    border-inline-start: 3px solid var(--gold);
    border-radius: 0 8px 8px 0;
  }

  .case-study-label {
    margin-block-end: 0.75rem;
    font-family: var(--mono);
    font-size: 0.62rem;
    font-weight: 500;
    color: var(--gold-dim);
    text-transform: uppercase;
    letter-spacing: 0.2em;
  }

  .case-study h3 {
    margin-block-end: 1rem;
    font-family: var(--display);
    font-size: 1.3rem;
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-bright);
  }

  .case-study p {
    font-size: 0.95rem;
    line-height: 1.65;
  }

  .case-study .mechanism {
    padding-block-start: 0.75rem;
    margin-block-start: 1rem;
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--cyan);
    border-block-start: 1px solid rgba(78, 205, 196, 0.15);
  }

  /* CANVAS SECTIONS */
  .canvas-section {
    inline-size: 100%;
    padding: 3rem 0;
  }

  .canvas-section canvas {
    display: block;
    inline-size: 100%;
    max-inline-size: 900px;
    block-size: 400px;
    margin: 0 auto;
  }

  .canvas-label {
    margin-block-start: 0.75rem;
    font-family: var(--mono);
    font-size: 0.62rem;
    color: var(--gold-dim);
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.15em;
  }

  .canvas-desc {
    max-inline-size: 560px;
    padding: 0 1.5rem;
    margin: 0.6rem auto 0;
    font-family: var(--body);
    font-size: 0.88rem;
    line-height: 1.6;
    color: var(--text);
    text-align: center;
    opacity: 0.7;
  }
}