@layer reset, tokens, type, base, layout, parts, utilities, motion;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  body, h1, h2, h3, h4, p, ul, dl, dd, figure { margin: 0; }
  ul { padding: 0; list-style: none; }
  img, svg { max-width: 100%; }
  button, summary, a { -webkit-tap-highlight-color: transparent; }
  button { font: inherit; }
  [hidden] { display: none !important; }
}

@layer tokens {
  @font-face {
    font-family: 'PT Serif';
    src: url('/static/pt-serif-bold.woff') format('woff');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
  }
  @font-face {
    font-family: 'PT Serif Caption';
    src: url('/static/pt-serif-caption.woff') format('woff');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
  }
  :root {
    --paper: #F0E3CE;
    --ink: #0D0D15;
    --red: #E85D35;
    --navy: #223A70;
    --brown: #8B7355;
    --tan: #D4A574;
    --coal: #4A4A4A;
    --face: 'PT Serif', Georgia, serif;
    --text: 'PT Serif Caption', Georgia, serif;
    --tech: 'JetBrains Mono', 'Courier New', monospace;
    --radius: 8px;
    --measure: 72ch;
    --read: min(var(--measure), 600px);
  }
}

@layer type {
  html { font-size: 16px; }
  body { font: 400 1rem/1.6 var(--text); color: var(--ink); }
  h1, h2, h3, h4, .brand strong, .f-name strong {
    font-family: var(--face);
    font-weight: 700;
    letter-spacing: -.025em;
    text-wrap: balance;
  }
  h1 { font-size: clamp(2.4rem, 4.9vw, 4.9rem); line-height: 1.05; max-width: 21ch; }
  h2 { font-size: clamp(1.55rem, 2.6vw, 2.15rem); line-height: 1.18; max-width: 35ch; }
  h3, h4 { font-size: 1.2rem; line-height: 1.3; }
  p { max-width: var(--read); }
  p + p { margin-top: .75rem; }
  .lead { font-size: 1.125rem; line-height: 1.65; max-width: 58ch; }
  .tag { font-size: .875rem; font-weight: 500; letter-spacing: .11em; text-transform: uppercase; color: var(--navy); }
  .rb { font-size: 1rem; font-weight: 500; letter-spacing: .03em; }
  .v { font-family: var(--tech); }
  a, button, summary, figcaption, .foot p, .ck, .nt, .terms { font-size: 1rem; }
}

@layer base {
  body {
    background-color: var(--paper);
  }
  a { color: var(--navy); text-underline-offset: .2em; }
  a:hover { text-decoration-thickness: 2px; }
  button, summary { cursor: pointer; }
  ::selection { background: var(--navy); color: var(--paper); }
  :focus-visible { outline: 3px solid var(--navy); outline-offset: 5px; }
  .ink :focus-visible, .navy :focus-visible, .foot :focus-visible { outline-color: var(--paper); }
  main { padding-bottom: 3rem; }
  main > * + * { margin-top: 2rem; }
  .box > h2, .inset > h2, .inset > h3 { margin-bottom: 1.25rem; }
  .box > h2 + p { margin-bottom: .75rem; }
}

@layer layout {
  .w { width: min(1168px, calc(100% - 64px)); margin-inline: auto; }
  .g { display: grid; gap: 1.5rem; }
  .mast { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 1.5rem; padding-block: 1.5rem 0; position: relative; }
  .topics { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, 1fr); border-block: 1px solid var(--ink); margin-top: -.5rem; position: relative; z-index: 5; }
  .hero { grid-template-columns: minmax(0, 1.5fr) minmax(0, .9fr); gap: 3rem; padding-top: 2.5rem; align-items: center; }
  .hero-copy { padding-block: 1rem; }
  .hero-side { position: relative; padding: 1rem 0 2rem; }
  .hero-copy h1 { margin-block: 1.7rem 1.5rem; }
  .hero-copy .lead { max-width: 50ch; }
  .hero-copy .rule { margin-block: 1.5rem; }
  .chapter { padding: 3.5rem 1rem 2rem; text-align: center; border-bottom: 4px double var(--ink); position: relative; }
  .chapter::after { content: ''; position: absolute; left: calc(50% - 48px); bottom: -16px; width: 96px; height: 32px; background: var(--paper) url('/static/scroll.svg') center / contain no-repeat; }
  .chapter h1 { margin: 1.75rem auto 1.5rem; }
  .chapter .lead { margin-inline: auto; }
  .box { border: 4px double var(--brown); border-radius: var(--radius); padding: 2rem; background: var(--paper); }
  .box > p, .box > .ck { max-width: var(--read); }
  .box > .ck, .box > p { margin-inline: auto; }
  .box > h2 { text-align: center; margin-inline: auto; }
  .start .ck { max-width: none; display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1.5rem; }
  .boards, .routes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .boards { grid-template-columns: 1fr 1fr 1fr; }
  .boards .inset > h3, .mode > h3 { font-size: 1.35rem; }
  .inset { border: 1px solid var(--brown); border-radius: var(--radius); padding: 1.5rem; min-width: 0; }
  .paths { padding-block: 1rem; }
  .hd { text-align: center; margin-bottom: 1.5rem; }
  .hd h2 { margin: .5rem auto 0; }
  .cards { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 1rem; }
  .card.wide { grid-row: span 2; }
  .nt { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem 2rem; }
  .terms { display: grid; grid-template-columns: 1fr 1.1fr 1fr; gap: 1.5rem; }
  .terms > div + div { border-left: 1px solid var(--tan); padding-left: 1.5rem; }
  .foot { padding: 2rem; background: var(--ink); color: var(--paper); border-radius: var(--radius) var(--radius) 0 0; border-top: 6px double var(--tan); }
  .foot-top { display: grid; grid-template-columns: 1fr 1.8fr; gap: 2rem; align-items: center; }
  .foot nav { display: flex; flex-wrap: wrap; gap: .25rem 1.5rem; margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--brown); }
  .next { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 1.5rem; padding: 1.5rem 2rem; border-block: 1px solid var(--ink); }

  @media (max-width: 850px) {
    .hero { gap: 1.5rem; grid-template-columns: 1.2fr 1fr; }
    .hero h1 { font-size: clamp(2.2rem, 5vw, 3.7rem); }
    .start .ck, .boards { grid-template-columns: 1fr; }
    .start .ck > li + li { border-top: 1px solid var(--tan); padding-top: 1.25rem; }
    .terms { grid-template-columns: 1fr; }
    .terms > div + div { border-left: 0; border-top: 1px solid var(--tan); padding: 1rem 0 0; }
    .cards { grid-template-columns: 1fr 1fr; }
    .card.wide { grid-row: auto; }
    .card:first-child { grid-column: span 2; }
  }

  @media (max-width: 600px) {
    .w { width: calc(100% - 32px); }
    .mast { gap: .75rem; padding-top: 1rem; }
    .mast-note { display: none; }
    .brand { grid-column: 1 / -1; }
    .topics { margin-top: .4rem; grid-template-columns: 1fr; }
    .hero { grid-template-columns: 1fr; padding-top: 1.5rem; gap: 1rem; }
    .hero-copy { padding: 0; }
    .hero h1 { font-size: clamp(2.65rem, 11vw, 3.5rem); }
    .hero-copy h1 { margin-block: 1.35rem 1.1rem; }
    .hero .lead { font-size: 1rem; }
    .hero-side { padding: 1rem 1rem 0; }
    .hero-side .vignette { aspect-ratio: 1.2; }
    .hero-side .slip { position: relative; inset: auto; margin: -.5rem .5rem 0; width: auto; }
    .chapter { padding: 2.5rem .25rem 2rem; }
    .chapter h1 { font-size: 2.4rem; }
    .box { padding: 1.5rem 1rem; }
    .routes, .nt, .cards, .foot-top { grid-template-columns: 1fr; }
    .card:first-child { grid-column: auto; }
    .inset { padding: 1.25rem 1rem; }
    .foot { padding: 1.5rem 1rem; }
    .foot-top { gap: 1rem; }
    .next { grid-template-columns: 1fr; padding-inline: .5rem; }
    .next .btn { justify-self: start; }
    .rb { padding: .6rem .9rem; }
    .notes { padding: 2rem .5rem; }
  }
}

@layer parts {
  .skip { position: absolute; z-index: 20; left: 1rem; top: 0; padding: .75rem 1rem; background: var(--ink); color: var(--paper); transform: translateY(-130%); }
  .skip:focus { transform: translateY(0); }
  .brand { display: flex; align-items: center; gap: 1rem; min-height: 72px; text-decoration: none; color: var(--ink); line-height: 1.3; }
  .brand strong { display: block; font-size: 1.85rem; letter-spacing: -.04em; }
  .seal { display: grid; place-items: center; width: 62px; height: 62px; flex-shrink: 0; border: 5px double var(--ink); border-radius: 50%; font-family: var(--face); font-size: 1.2rem; color: var(--navy); transform: rotate(-5deg); }
  .mast-note { color: var(--navy); text-align: right; font-size: 1rem; }
  .topic { position: relative; min-width: 0; }
  .topic + .topic { border-left: 1px solid var(--brown); }
  .topic summary { display: flex; align-items: center; justify-content: space-between; padding: .7rem 1rem; min-height: 48px; list-style: none; font-weight: 500; }
  .topic summary::-webkit-details-marker { display: none; }
  .topic[open] summary { background: var(--navy); color: var(--paper); }
  .topic ul { position: absolute; top: 100%; left: -1px; right: -1px; padding: .5rem; background: var(--paper); border: 2px solid var(--ink); box-shadow: 4px 6px 0 #0D0D1522; }
  .topic a { display: flex; align-items: center; min-height: 48px; padding: .55rem .75rem; text-decoration-thickness: 1px; }
  .topic a[aria-current] { color: var(--ink); font-weight: 700; border-left: 3px solid var(--red); }
  .rb { display: inline-block; background: var(--red); color: var(--ink); padding: .55rem 1.2rem; border: 1px solid var(--ink); box-shadow: 5px 5px 0 var(--tan); border-radius: 2px var(--radius) 2px var(--radius); }
  .hero h1 span { color: var(--navy); }
  .rule { border-left: 4px solid var(--red); padding: .25rem 0 .25rem 1rem; font-size: 1rem; }
  .btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: .75rem 1.15rem; color: var(--paper); background: var(--ink); border: 2px solid var(--ink); border-radius: var(--radius); text-decoration: none; gap: .65rem; box-shadow: 4px 4px 0 var(--tan); }
  .btn:hover { background: var(--navy); border-color: var(--navy); }
  .box .btn + .btn { margin: .75rem .75rem 0; }
  .ln, .src { display: inline-flex; align-items: center; min-height: 44px; padding-block: .5rem; gap: .25rem; }
  .photo { margin: 1.5rem auto; max-width: 840px; padding: 12px; border: 5px double var(--brown); border-radius: 44% 44% var(--radius) var(--radius) / 16% 16% var(--radius) var(--radius); background: #EBD7BD; }
  .vignette { position: relative; overflow: hidden; isolation: isolate; border: 1px solid var(--ink); border-radius: inherit; aspect-ratio: 15 / 8; background: radial-gradient(ellipse at 35% 25%, #F0E3CE, #D4A574 70%, #8B7355); }
  .vignette::after { content: ''; position: absolute; inset: 0; pointer-events: none; background: radial-gradient(ellipse at center, transparent 42%, #F0E3CE99 90%, #F0E3CE 100%); mix-blend-mode: multiply; }
  .vignette img { display: block; width: 100%; height: 100%; object-fit: cover; color: transparent; font-size: 0; }
  .hero-side .photo { margin: 0; transform: rotate(1.1deg); }
  .hero-side .vignette { aspect-ratio: 9 / 10; }
  figcaption { padding: .8rem .5rem .25rem; text-align: center; color: var(--ink); }
  .slip { position: absolute; left: -24px; right: 24px; bottom: 0; background: var(--ink); color: var(--paper); padding: 1rem 1.25rem; border: 4px double var(--tan); border-radius: var(--radius); transform: rotate(-1.1deg); }
  .slip .tag { color: var(--paper); letter-spacing: .04em; }
  .slip p { margin-top: .5rem; font-family: var(--face); font-weight: 700; font-size: 1.2rem; line-height: 1.4; }
  .ck > li { display: grid; grid-template-columns: 28px minmax(0, 1fr); gap: .7rem; }
  .ck > li + li { margin-top: 1.4rem; }
  .start .ck > li + li { margin-top: 0; }
  .ck h3, .ck h4 { margin-bottom: .5rem; }
  .tick { width: 28px; height: 28px; border: 1px solid var(--brown); border-radius: 3px; color: var(--navy); display: grid; place-items: center; line-height: 1; transform: rotate(-3deg); }
  .terms dt { font-family: var(--face); font-weight: 700; font-size: 1.3rem; margin-bottom: .5rem; }
  .card { position: relative; display: block; min-width: 0; border: 3px double var(--brown); border-radius: var(--radius); padding: 1.5rem 1.3rem 3rem; color: var(--ink); text-decoration: none; background: var(--paper); }
  .card h3 { font-size: 1.6rem; }
  .card p { margin-top: .75rem; }
  .card.wide { padding-top: 2.5rem; background: #ECD9C0; }
  .card.wide::before { content: ''; position: absolute; top: 1rem; left: calc(50% - 55px); width: 110px; height: 24px; background: url('/static/scroll.svg') center / contain no-repeat; pointer-events: none; }
  .card.dark { background: var(--coal); color: var(--paper); border-color: var(--ink); }
  .go { position: absolute; bottom: .8rem; right: 1.25rem; font-size: 1.5rem; color: var(--navy); }
  .dark .go { color: var(--paper); }
  .card:hover { border-color: var(--ink); box-shadow: 4px 4px 0 #8B735540; }
  .notes { position: relative; padding: 2.5rem 2rem 1rem; border-top: 4px double var(--ink); background: var(--paper); }
  .notes::before { content: ''; position: absolute; top: .5rem; left: calc(50% - 60px); width: 120px; height: 26px; background: url('/static/scroll.svg') center / contain no-repeat; pointer-events: none; }
  .notes .hd { margin-top: 1rem; }
  .nt > li { display: grid; grid-template-columns: 32px minmax(0, 1fr); gap: .75rem; align-content: start; }
  .nt h3 { margin: .1rem 0 .6rem; }
  .nt p { font-size: 1rem; }
  .mark { display: grid; place-items: center; width: 32px; height: 32px; border: 3px double var(--brown); border-radius: 50%; font-family: var(--face); font-weight: 700; }
  .switch { display: flex; flex-wrap: wrap; gap: .6rem; max-width: 72ch; margin: 0 auto 1rem; justify-content: center; }
  .switch button { background: transparent; color: var(--navy); min-height: 48px; padding: .65rem 1rem; border: 2px solid var(--navy); border-radius: var(--radius); }
  .switch button[aria-pressed='true'] { background: var(--navy); color: var(--paper); }
  .view { text-align: center; margin-bottom: 1.25rem; }
  .routes[data-only] { grid-template-columns: 1fr; max-width: var(--read); margin-inline: auto; }
  .fold { max-width: var(--read); margin: 0 auto; padding: 1rem 0; border-top: 1px solid var(--brown); }
  .fold summary { padding: .5rem 0; min-height: 44px; font-family: var(--face); font-weight: 700; }
  .fold p { margin-top: .75rem; }
  .note { border-color: var(--navy); border-left-width: 8px; }
  .price { border: 6px double var(--ink); background: #EAD7BC; }
  .price p { font-variant-numeric: lining-nums tabular-nums; }
  .ink { background: var(--ink); color: var(--paper); border-color: var(--tan); }
  .navy { background: var(--navy); color: var(--paper); border-color: var(--tan); }
  .ink .tick, .navy .tick { color: var(--paper); }
  .pull { font-family: var(--face); font-weight: 700; font-size: 1.6rem; text-align: center; }
  .f-name { line-height: 1.4; font-size: 1.125rem; }
  .f-name strong { font-size: 1.75rem; }
  .foot a { display: inline-flex; align-items: center; min-height: 44px; color: var(--paper); padding-block: .5rem; }
  .up { margin-top: .75rem; }

  @media (max-width: 600px) {
    .topic { position: static; }
    .topic + .topic { border-left: 0; border-top: 1px solid var(--brown); }
    .topic summary { padding: .7rem .75rem; justify-content: space-between; min-height: 48px; }
    .topic ul { position: static; width: 100%; }
    .hero-side .vignette { aspect-ratio: 1.2; }
    .hero-side .slip { position: relative; left: auto; right: auto; bottom: auto; }
    .notes { padding-inline: .5rem; }
  }
}

@layer utilities {
  .sr { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
}

@layer motion {
  @media (prefers-reduced-motion: no-preference) {
    .rb { animation: settle .45s cubic-bezier(.18,.65,.35,1.1) both; }
    .btn, .card, .switch button { transition: background-color .18s, border-color .18s, box-shadow .18s; }
    @keyframes settle { from { transform: translateY(-3px) rotate(-.7deg); } to { transform: translateY(0) rotate(0); } }
  }
  @media print {
    body { background: white; }
    .topics, .switch, .mast-note, .photo, .slip, .next, .up, .foot nav { display: none !important; }
    .w { width: 100%; }
    .box, .chapter, .notes, .foot { break-inside: avoid; background: white; color: black; }
    a { color: black; }
  }
}