@layer base {
  * {
    -webkit-color-scheme: light;
    color-scheme: light;
  }
  html {
    background: rgb(255 255 255);
  }
  @media (prefers-color-scheme: dark) {
    html,
    body {
      color: rgb(26 25 23);
      background: rgb(255 255 255);
    }
  }
  *,
  *::before,
  *::after {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
  }

  :root {
    --bg: rgb(255 255 255);
    --surface: rgb(245 245 243);
    --border: rgb(224 221 216);
    --text: rgb(26 25 23);
    --text-muted: rgb(107 104 96);
    --text-dim: rgb(155 152 144);
    --accent: rgb(43 45 110);
    --accent2: rgb(124 63 140);
    --gold: rgb(212 168 83);
    --gold-dim: rgb(160 120 48);
    --cyan: rgb(42 112 144);
    --cyan-dim: rgb(26 80 104);
    --violet: rgb(107 63 140);
    --violet-dim: rgb(74 43 98);
    --green: rgb(42 112 80);
    --red: rgb(140 42 42);
    --mono: "DM Mono", monospace;
    --sans: "Syne", sans-serif;
    color-scheme: light;
  }

  body {
    min-block-size: 100vh;
    font-family: var(--sans);
    font-size: 15px;
    line-height: 1.68;
    color: var(--text);
    background: rgb(255 255 255);
  }

  /* NAV */
  .nav-back {
    position: fixed;
    inset-block-start: 20px;
    inset-inline-start: 24px;
    z-index: 100;
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    text-decoration: none;
    transition: color 0.2s;
  }
  .nav-back:hover {
    color: var(--accent);
  }

  /* HERO */
  .hero {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-block-size: 100dvh;
    padding: 80px 32px 60px;
    overflow: hidden;
    border-block-end: 1px solid var(--border);
  }
  @supports not (min-block-size: 100dvh) {
    .hero {
      min-block-size: 100vh;
    }
  }
  @media (max-height: 600px) {
    .hero {
      min-block-size: 520px;
      padding: 64px 24px 48px;
    }
  }
  .hero canvas {
    position: absolute;
    inset-block-start: 0;
    inset-inline-start: 0;
    inline-size: 100%;
    block-size: 100%;
    pointer-events: none;
    opacity: 0.4;
  }
  @media (max-width: 600px) {
    .hero canvas {
      opacity: 0.5;
    }
  }
  .hero-content {
    position: relative;
    z-index: 2;
    max-inline-size: 760px;
    text-align: center;
  }
  .hero-label {
    margin-block-end: 28px;
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3em;
  }
  .hero h1 {
    margin-block-end: 20px;
    font-size: clamp(32px, 5.5vw, 56px);
    font-weight: 800;
    line-height: 1.05;
    color: var(--text);
  }
  .hero h1 em {
    font-style: normal;
    color: var(--accent);
  }
  .hero-sub {
    max-inline-size: 600px;
    margin: 0 auto 28px;
    font-size: clamp(14px, 1.6vw, 17px);
    line-height: 1.6;
    color: var(--text-muted);
  }
  .hero-meta {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text-dim);
    letter-spacing: 0.15em;
  }
  .scroll-chevron {
    position: absolute;
    inset-block-end: 32px;
    inset-inline-start: 50%;
    z-index: 2;
    padding: 8px;
    color: var(--text-dim);
    cursor: pointer;
    background: none;
    border: none;
    opacity: 0.6;
    transform: translateX(-50%);
    transition: opacity 0.2s;
  }
  .scroll-chevron:hover {
    opacity: 1;
  }
  .scroll-chevron svg {
    inline-size: 24px;
    block-size: 24px;
  }

  /* SECTIONS */
  section {
    position: relative;
    padding: 72px 32px;
    border-block-end: 1px solid var(--border);
  }
  section::before {
    position: absolute;
    inset-block-start: 0;
    inset-block-end: 0;
    inset-inline-start: 0;
    inline-size: 3px;
    content: "";
    background: var(--section-accent, var(--accent));
    opacity: 0;
    transition: opacity 0.4s;
  }
  section.has-accent::before {
    opacity: 1;
  }
  section.accent-violet {
    --section-accent: var(--violet);
  }
  section.accent-gold {
    --section-accent: var(--gold);
  }
  section.accent-cyan {
    --section-accent: var(--cyan);
  }
  section.accent-green {
    --section-accent: var(--green);
  }

  .tempo-jo {
    padding-block-start: 80px;
    padding-block-end: 80px;
  }
  .tempo-ha {
    padding-block-start: 64px;
    padding-block-end: 64px;
  }
  .tempo-kyu {
    padding-block-start: 48px;
    padding-block-end: 48px;
  }
  section.lede.tempo-jo {
    padding-block-end: 0;
  }

  .void-section {
    background: color-mix(in srgb, var(--violet) 4%, var(--bg));
    border-inline-start: 3px solid var(--violet);
  }

  .prose {
    max-inline-size: 680px;
    margin: 0 auto;
  }
  .prose p {
    margin-block-end: 1.4em;
  }
  .prose p:last-child {
    margin-block-end: 0;
  }
  .prose.after-grid {
    margin-block-start: 36px;
  }
  .prose p.flush-end,
  .callout p.flush-end {
    margin-block-end: 0;
  }

  .section-number {
    margin-block-end: 12px;
    font-family: var(--mono);
    font-size: 9px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.3em;
  }
  .section-number::before {
    margin-inline-end: 4px;
    content: "§";
  }
  .section-number.closing-number {
    color: var(--gold-dim);
  }

  h2 {
    margin-block-end: 28px;
    font-size: 24px;
    font-weight: 800;
    line-height: 1.2;
    color: var(--text);
  }

  /* SEMANTIC EMPHASIS */
  .thesis {
    font-weight: 600;
    color: var(--gold);
  }
  .evidence {
    color: var(--cyan);
  }
  .void-text {
    font-weight: 600;
    color: var(--violet);
  }
  .method {
    font-weight: 600;
    color: var(--green);
  }
}