/* One stylesheet for the landing page and every guide. A ledger: warm paper, near-black
   ink, one orange accent — the family a host names with `Recourse.color = :orange` —
   and both modes, since the pages this gem draws follow the system too. */
:root {
  --paper: #f6f4ee;
  --paper-2: #ece8dd;
  --ink: #1c1a17;
  --ink-2: #57524a;
  --quiet: #8a8378;
  --rule: #d9d3c5;
  --accent: #c2410c;
  --accent-ink: #9a3412;
  --code-bg: #fffdf8;
  --mark: #ffe8b3;
  --text: 'Inter', -apple-system, 'Segoe UI', Helvetica, Arial, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, Menlo, monospace;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #16151a;
    --paper-2: #1f1d24;
    --ink: #ece8df;
    --ink-2: #b4ada0;
    --quiet: #7f786c;
    --rule: #2f2c36;
    --accent: #f97316;
    --accent-ink: #fb923c;
    --code-bg: #1b1920;
    --mark: #4a3a10;
  }
}

* { box-sizing: border-box; }

html { scroll-padding-top: 24px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.6 var(--text);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-ink); text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--accent) 45%, transparent); }
a:hover { color: var(--accent); border-bottom-color: var(--accent); }

h1, h2, h3, h4 { font-weight: 600; letter-spacing: -0.01em; line-height: 1.15; margin: 0; }
h1 { font-size: clamp(34px, 5vw, 56px); }
.hero h1 { font-size: clamp(28px, 2.6vw, 33px); }
@media (min-width: 1180px) { .hero h1 { white-space: nowrap; } }
h2 { font-size: clamp(26px, 3.2vw, 34px); margin-top: 2.4em; }
h3 { font-size: clamp(20px, 2.2vw, 24px); margin-top: 1.8em; }
h2 + p, h3 + p, h2 + pre, h3 + pre, h2 + table, h3 + table { margin-top: .8em; }

p, ul, ol { margin: 0 0 1em; }
li { margin-bottom: .35em; }

code, pre, kbd { font-family: var(--mono); font-size: .88em; }
code {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: .08em .35em;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  line-height: 1.6;
  margin: 0 0 1.2em;
}
pre code { background: none; border: 0; padding: 0; font-size: .86em; }
pre .add { color: #15803d; }
pre .del { color: #b91c1c; }
pre .c { color: var(--quiet); }

table { width: 100%; border-collapse: collapse; font-size: .94em; margin: 0 0 1.4em; }
th, td { text-align: left; vertical-align: top; padding: 9px 10px 9px 0; border-bottom: 1px solid var(--rule); }
th { font-weight: 600; color: var(--ink-2); font-size: .85em; letter-spacing: .04em; text-transform: uppercase; }
td code { white-space: nowrap; }

mark { background: var(--mark); color: inherit; padding: 0; }

img.shot { width: 100%; height: auto; border: 1px solid var(--rule); border-radius: 8px; display: block; margin: 1.2em 0 1.6em; }

.wrap { max-width: 1140px; margin: 0 auto; padding: 0 16px; }

/* ---- the masthead every page shares ---- */
.mast {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding: 18px 0; border-bottom: 1px solid var(--rule);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 22px; color: var(--ink); border: 0; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
.mast nav { display: flex; flex-wrap: wrap; gap: 6px 22px; font-size: .95em; }
.mast nav a { color: var(--ink-2); border: 0; }
.mast nav a:hover, .mast nav a[aria-current] { color: var(--accent); }

/* ---- the landing page ---- */
.hero { padding: clamp(20px, 4vw, 44px) 0 clamp(24px, 4vw, 48px); }
.hero .lede { font-size: clamp(18px, 1.6vw, 21px); color: var(--ink-2); margin: 1.2em 0 1.6em; }
.hero .actions { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 6px; font-weight: 600; border: 1px solid var(--accent);
}
.btn.solid { background: var(--accent); color: #fff; }
.btn.solid:hover { background: var(--accent-ink); color: #fff; border-color: var(--accent-ink); }
.btn.outline { color: var(--accent-ink); }
.btn.outline:hover { background: color-mix(in srgb, var(--accent) 10%, transparent); }

/* The swap: `resources` becomes `recourses` when its third and seventh letters trade
   places, and the two letters do it on screen. */
.swap { --gap: 4ch; font-family: var(--mono); font-size: clamp(30px, 5.4vw, 60px); font-weight: 400; letter-spacing: .02em; display: inline-flex; margin: 0 0 .3em; }
.swap span { display: inline-block; }
.swap .s, .swap .c { color: var(--accent); position: relative; animation: 6s ease-in-out infinite; }
.swap .s { animation-name: to-c; }
.swap .c { animation-name: to-s; }
/* Each letter travels over or under the three between them rather than through them. */
@keyframes to-c {
  0%, 30% { transform: translate(0, 0); }
  40% { transform: translate(calc(var(--gap) / 2), -.55em); }
  50%, 80% { transform: translate(var(--gap), 0); }
  90% { transform: translate(calc(var(--gap) / 2), -.55em); }
  100% { transform: translate(0, 0); }
}
@keyframes to-s {
  0%, 30% { transform: translate(0, 0); }
  40% { transform: translate(calc(var(--gap) / -2), .55em); }
  50%, 80% { transform: translate(calc(-1 * var(--gap)), 0); }
  90% { transform: translate(calc(var(--gap) / -2), .55em); }
  100% { transform: translate(0, 0); }
}
@media (prefers-reduced-motion: reduce) { .swap .s, .swap .c { animation: none; } }

.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 22px; margin: 32px 0 8px; }
/* `min-width: 0` on every grid item: a grid item will not shrink below its content by
   default, so a long line in a `pre` would widen the column past the viewport. */
.step, .earned div, .guides a { min-width: 0; }
.step { border: 1px solid var(--rule); border-radius: 10px; padding: 20px 22px; background: color-mix(in srgb, var(--paper-2) 60%, transparent); }
.step .n { font-family: var(--mono); color: var(--accent); font-size: .8em; letter-spacing: .1em; }
.step h3 { margin: .3em 0 .5em; }
.step p { color: var(--ink-2); font-size: .95em; margin: 0 0 .8em; }
.step pre { margin: 0; font-size: .92em; }

.earned { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px 28px; margin: 24px 0 0; }
.earned div { border-top: 2px solid var(--accent); padding-top: 12px; }
.earned b { display: block; font-weight: 500; font-size: 1.2em; margin-bottom: .3em; }
.earned p { color: var(--ink-2); font-size: .95em; margin: 0; }

.guides { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 16px; margin: 20px 0 0; }
.guides a { display: block; border: 1px solid var(--rule); border-radius: 10px; padding: 16px 18px; color: var(--ink); background: color-mix(in srgb, var(--paper-2) 50%, transparent); }
.guides a:hover { border-color: var(--accent); }
.guides b { display: block; font-weight: 500; font-size: 1.15em; margin-bottom: .25em; }
.guides span { color: var(--ink-2); font-size: .92em; }

.foot { display: flex; gap: 24px; flex-wrap: wrap; justify-content: space-between; padding: 28px 0 40px; margin-top: 60px; border-top: 1px solid var(--rule); color: var(--quiet); font-size: .92em; }
.foot a { color: var(--ink-2); }

/* ---- the guides ---- */
.guide { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 48px; padding: 32px 0 0; align-items: start; }
.guide > aside { position: sticky; top: 24px; font-size: .92em; }
.guide > aside b { display: block; color: var(--quiet); font-size: .8em; letter-spacing: .1em; text-transform: uppercase; margin-bottom: 10px; }
.guide > aside ol { list-style: none; margin: 0 0 24px; padding: 0; }
.guide > aside li { margin: 0; }
.guide > aside a { display: block; padding: 5px 0; color: var(--ink-2); border: 0; }
.guide > aside a[aria-current] { color: var(--accent); font-weight: 600; }
.guide > aside a:hover { color: var(--accent); }
.guide > article { max-width: 72ch; }
.chapters { border: 1px solid var(--rule); border-radius: 8px; padding: 14px 18px 8px; margin: 22px 0 8px; background: color-mix(in srgb, var(--paper-2) 50%, transparent); }
.chapters b { display: block; font-size: .8em; letter-spacing: .1em; text-transform: uppercase; color: var(--quiet); margin-bottom: 6px; }
.chapters ol { margin: 0; padding-left: 1.3em; columns: 2; column-gap: 28px; }
.chapters li { break-inside: avoid; margin: 0 0 .3em; }
.chapters a { border: 0; }
.next { display: flex; justify-content: space-between; gap: 16px; margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--rule); font-size: .95em; }
.aside-note { border-left: 3px solid var(--accent); padding: 4px 0 4px 16px; color: var(--ink-2); margin: 1.2em 0 1.4em; }

@media (max-width: 640px) {
  /* A table reads as one block per row on a phone, each cell led by its heading. */
  table, tbody, tr, td { display: block; }
  thead { display: none; }
  tr { padding: 10px 0; border-bottom: 1px solid var(--rule); }
  td { border: 0; padding: 2px 0; }
  td:first-child { font-weight: 600; }
  td[data-label]:not(:first-child)::before { content: attr(data-label) ": "; color: var(--quiet); font-size: .85em; }
}

@media (max-width: 860px) {
  .guide { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  td code { white-space: normal; }
  .guide > aside { position: static; display: flex; flex-wrap: wrap; gap: 4px 14px; align-items: baseline; padding-bottom: 14px; border-bottom: 1px solid var(--rule); }
  .guide > aside b { width: 100%; margin: 0 0 4px; }
  .guide > aside ol { display: contents; }
  .guide > aside a { padding: 2px 0; }
  .chapters ol { columns: 1; }
  .mast nav { gap: 16px; }
}