@charset "utf-8";

/* ============================================================================
   Reading view. Long-form prose gets a narrower measure, a larger optical
   size, and none of the home page's furniture.
   ========================================================================= */

body.reading {
  font-size: clamp(1.0625rem, 1rem + 0.35vw, 1.1875rem);
  line-height: 1.72;
  background: var(--ground);

  & .page { max-width: 46rem; padding-block-end: 5rem; }
  & .col  { max-width: 38rem; }
}

.backline {
  padding-block: 1.75rem 0;
  font: 400 0.8125rem/1 var(--mono);
  letter-spacing: 0.05em;
  color: var(--faint);

  & span { margin-inline: 0.4rem; }
  & a { border: none; color: var(--muted); &:hover { color: var(--accent); } }
}

.essay-head {
  margin-block: 3.5rem 3rem;
  padding-block-end: 2rem;
  border-block-end: 1px solid var(--rule);

  & h1 {
    font-size: clamp(2rem, 1.4rem + 2.8vw, 3.1rem);
    font-variation-settings: "opsz" 48;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.015em;
    margin-block-end: 1rem;
    text-wrap: balance;
  }
}

.essay-sub {
  margin-block-end: 1.25rem;
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--ink-soft);
  text-wrap: pretty;
}

.essay-meta {
  margin: 0;
  font: 400 0.8125rem/1.6 var(--mono);
  letter-spacing: 0.04em;
  color: var(--faint);
}

article {
  color: var(--ink-soft);

  & h2 {
    margin-block: 3rem 1rem;
    font-size: clamp(1.35rem, 1.1rem + 1vw, 1.7rem);
    font-variation-settings: "opsz" 28;
    color: var(--ink);
    letter-spacing: -0.005em;
  }

  & h3 {
    margin-block: 2rem 0.6rem;
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--ink);
  }

  & p { margin-block: 0 1.3rem; }

  & strong { color: var(--ink); }
  & em { color: var(--ink); }

  & ul, & ol {
    margin-block: 0 1.5rem;
    padding-inline-start: 1.4rem;

    & li { margin-block-end: 0.55rem; }
    & li::marker { color: var(--accent-deep); }
  }

  & blockquote {
    margin: 1.75rem 0;
    padding: 0.15rem 0 0.15rem 1.35rem;
    border-inline-start: 2px solid var(--hair);
    color: var(--muted);
    font-style: italic;

    & p:last-child { margin-block-end: 0; }
    & strong, & em { color: var(--ink-soft); }
  }

  & hr {
    margin-block: 3rem;
    border: 0;
    border-block-start: 1px solid var(--rule);
  }

  & code {
    font-family: var(--mono);
    font-size: 0.875em;
    padding: 0.12em 0.36em;
    border-radius: 2px;
    background: color-mix(in oklch, var(--ground-lift) 80%, transparent);
    color: var(--ink);
  }

  & pre {
    margin-block: 1.75rem;
    padding: 1.1rem 1.2rem;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    border: 1px solid var(--rule);
    border-radius: 3px;
    background: color-mix(in oklch, var(--ground-lift) 70%, transparent);
    font-size: 0.8125rem;
    line-height: 1.6;

    & code { padding: 0; background: none; font-size: inherit; }
  }

  /* Tables in an essay are usually wide. Let them scroll rather than
     squeezing the measure for everything else. */
  & table {
    display: block;
    max-width: 100%;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    margin-block: 1.75rem;
    border-collapse: collapse;
    font-size: 0.9375rem;

    & th, & td {
      padding: 0.6rem 1rem 0.6rem 0;
      border-block-end: 1px solid color-mix(in oklch, var(--rule) 60%, transparent);
      text-align: left;
      vertical-align: baseline;
    }
    & th {
      font: 500 0.7rem/1.4 var(--mono);
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: var(--faint);
      white-space: nowrap;
    }
  }

  /* python-markdown footnotes */
  & .footnote {
    margin-block-start: 3.5rem;
    padding-block-start: 1.5rem;
    border-block-start: 1px solid var(--rule);
    font-size: 0.9375rem;
    color: var(--muted);

    & hr { display: none; }
    & ol { padding-inline-start: 1.2rem; }
  }
  & .footnote-ref { font-size: 0.8em; vertical-align: super; border: none; }
  & .footnote-backref { border: none; }
}

/* A long essay deserves a reading-progress cue that costs nothing. */
@supports (animation-timeline: scroll()) {
  @media (prefers-reduced-motion: no-preference) {
    body.reading::after {
      content: "";
      position: fixed;
      inset-block-start: 0;
      inset-inline-start: 0;
      z-index: 50;
      height: 2px;
      width: 100%;
      transform-origin: 0 50%;
      background: linear-gradient(to right, var(--accent-deep), var(--accent));
      animation: progress linear both;
      animation-timeline: scroll(root block);
    }
  }
}

@keyframes progress {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}