:root {
  --paper: #faf8f4;
  --paper-2: #f2eee6;
  --ink: #1d1b18;
  --ink-2: #4a453e;
  --ink-3: #7a7369;
  --rule: #e2dcd0;
  --copper: #b4531a;
  --copper-2: #8f3f10;
  --copper-soft: #f6e6d9;
  --steel: #5b6770;
  --card: #ffffff;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Consolas, monospace;
  --measure: 42rem;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #161412;
    --paper-2: #1f1c19;
    --ink: #ece7df;
    --ink-2: #c2bbb0;
    --ink-3: #8f887d;
    --rule: #34302b;
    --copper: #e08a52;
    --copper-2: #f0a574;
    --copper-soft: #33241a;
    --steel: #9aa7b0;
    --card: #1c1916;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; height: auto; }

a { color: var(--copper); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { color: var(--copper-2); text-decoration-thickness: 2px; }

.wrap { max-width: 68rem; margin: 0 auto; padding-inline: 1.25rem; }

.skip { position: absolute; left: -999px; }
.skip:focus { left: 1rem; top: 1rem; background: var(--card); padding: .5rem 1rem; z-index: 10; }

/* ---------- Header ---------- */
.site-header { border-bottom: 1px solid var(--rule); background: var(--paper); }
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap; padding-block: 1rem;
}
.brand {
  display: inline-flex; align-items: center; gap: .6rem;
  color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: -0.01em;
}
.brand:hover { color: var(--ink); }
.brand svg { width: 30px; height: 30px; flex: none; }
.brand small { color: var(--ink-3); font-weight: 500; }
.site-nav { display: flex; gap: 1.25rem; flex-wrap: wrap; align-items: center; font-size: .92rem; }
.site-nav a { color: var(--ink-2); text-decoration: none; }
.site-nav a:hover { color: var(--copper); }
.site-nav a.shop {
  color: var(--copper); border: 1px solid var(--copper); border-radius: 999px;
  padding: .3rem .85rem; font-weight: 600;
}
.site-nav a.shop:hover { background: var(--copper); color: var(--paper); }

/* ---------- Home ---------- */
.hero { padding-block: 4rem 3rem; border-bottom: 1px solid var(--rule); }
.hero .wrap { display: grid; grid-template-columns: 1.3fr 1fr; gap: 3rem; align-items: center; }
.eyebrow {
  font-size: .78rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--copper); font-weight: 600; margin: 0 0 .75rem;
}
.hero h1 {
  font-family: var(--serif); font-weight: 600; font-size: clamp(2.1rem, 5vw, 3.3rem);
  line-height: 1.08; letter-spacing: -0.02em; margin: 0 0 1.25rem;
}
.hero p.lede { font-size: 1.15rem; color: var(--ink-2); max-width: 36rem; margin: 0 0 1.5rem; }
.hero-art { color: var(--steel); }
.btn {
  display: inline-block; background: var(--copper); color: #fff; text-decoration: none;
  padding: .7rem 1.2rem; border-radius: 8px; font-weight: 600; font-size: .95rem;
}
.btn:hover { background: var(--copper-2); color: #fff; }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--rule); margin-left: .5rem; }
.btn.ghost:hover { border-color: var(--copper); color: var(--copper); }

.facts { padding-block: 2rem; border-bottom: 1px solid var(--rule); background: var(--paper-2); }
.facts ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.facts strong { display: block; font-family: var(--serif); font-size: 1.6rem; font-weight: 600; color: var(--ink); line-height: 1.2; }
.facts span { font-size: .88rem; color: var(--ink-3); }

.section { padding-block: 3.5rem; }
.section h2 {
  font-family: var(--serif); font-weight: 600; font-size: 1.8rem; letter-spacing: -0.01em;
  margin: 0 0 .4rem;
}
.section .sub { color: var(--ink-3); margin: 0 0 2rem; }

.guide-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
.guide-card {
  display: flex; flex-direction: column; gap: .5rem;
  background: var(--card); border: 1px solid var(--rule); border-radius: 12px;
  padding: 1.4rem 1.5rem; text-decoration: none; color: var(--ink);
  transition: border-color .15s, transform .15s;
}
.guide-card:hover { border-color: var(--copper); color: var(--ink); transform: translateY(-2px); }
.guide-card .num { font-family: var(--mono); font-size: .8rem; color: var(--copper); }
.guide-card h3 { font-family: var(--serif); font-size: 1.3rem; font-weight: 600; margin: 0; line-height: 1.25; }
.guide-card p { margin: 0; color: var(--ink-2); font-size: .95rem; }
.guide-card .meta { margin-top: auto; padding-top: .5rem; font-size: .8rem; color: var(--ink-3); }

.band {
  background: var(--copper-soft); border-radius: 14px; padding: 2rem;
  display: flex; gap: 1.5rem; align-items: center; justify-content: space-between; flex-wrap: wrap;
}
.band h2 { font-size: 1.4rem; margin: 0 0 .3rem; }
.band p { margin: 0; color: var(--ink-2); max-width: 38rem; }

/* ---------- Article ---------- */
.article-head { padding-block: 3rem 1.5rem; }
.article-head .inner, .prose, .article-foot { max-width: var(--measure); margin-inline: auto; }
.crumbs { font-size: .85rem; color: var(--ink-3); margin-bottom: 1.25rem; }
.crumbs a { color: var(--ink-3); }
.article-head h1 {
  font-family: var(--serif); font-weight: 600; font-size: clamp(2rem, 4.5vw, 2.9rem);
  line-height: 1.12; letter-spacing: -0.02em; margin: 0 0 1rem;
}
.article-head .standfirst { font-family: var(--serif); font-size: 1.25rem; color: var(--ink-2); line-height: 1.5; margin: 0 0 1.25rem; }
.byline { font-size: .85rem; color: var(--ink-3); display: flex; gap: .4rem 1rem; flex-wrap: wrap; }

.toc {
  border: 1px solid var(--rule); border-radius: 10px; padding: 1rem 1.25rem;
  margin: 0 0 2.5rem; font-family: var(--sans); font-size: .92rem; background: var(--card);
}
.toc strong { display: block; font-size: .75rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: .4rem; }
.toc ol { margin: 0; padding-left: 1.2rem; }
.toc li { margin: .15rem 0; }

.prose { font-family: var(--serif); font-size: 1.16rem; line-height: 1.7; padding-bottom: 2rem; }
.prose h2 {
  font-family: var(--serif); font-weight: 600; font-size: 1.65rem; line-height: 1.25;
  margin: 2.75rem 0 .75rem; letter-spacing: -0.01em; scroll-margin-top: 1rem;
}
.prose h3 { font-family: var(--sans); font-size: 1.05rem; font-weight: 700; margin: 2rem 0 .5rem; }
.prose p, .prose ul, .prose ol { margin: 0 0 1.15rem; }
.prose li { margin-bottom: .4rem; }
.prose strong { font-weight: 650; }
.prose code { font-family: var(--mono); font-size: .88em; background: var(--paper-2); padding: .1em .35em; border-radius: 4px; }

.prose figure { margin: 2rem 0; }
.prose figure .art {
  background: var(--card); border: 1px solid var(--rule); border-radius: 12px;
  padding: 1.25rem; color: var(--steel); display: flex; justify-content: center;
}
.prose figcaption { font-family: var(--sans); font-size: .85rem; color: var(--ink-3); margin-top: .6rem; }

.callout {
  font-family: var(--sans); font-size: .98rem; line-height: 1.6;
  border-left: 3px solid var(--copper); background: var(--copper-soft);
  padding: 1rem 1.25rem; border-radius: 0 10px 10px 0; margin: 1.75rem 0;
}
.callout p:last-child { margin-bottom: 0; }
.callout .label { display: block; font-weight: 700; font-size: .75rem; letter-spacing: .1em; text-transform: uppercase; color: var(--copper); margin-bottom: .25rem; }

.formula {
  font-family: var(--mono); font-size: .95rem; background: var(--paper-2);
  border: 1px solid var(--rule); border-radius: 8px; padding: .9rem 1.1rem; margin: 1.25rem 0;
  overflow-x: auto; white-space: pre; line-height: 1.6;
}

.table-wrap { overflow-x: auto; margin: 1.5rem 0; border: 1px solid var(--rule); border-radius: 10px; }
table { border-collapse: collapse; width: 100%; font-family: var(--sans); font-size: .92rem; line-height: 1.45; }
th, td { text-align: left; padding: .65rem .9rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { background: var(--paper-2); font-weight: 600; font-size: .82rem; color: var(--ink-2); }
tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

.article-foot { padding-bottom: 3rem; }
.cta-box {
  font-family: var(--sans); background: var(--card); border: 1px solid var(--rule);
  border-radius: 12px; padding: 1.5rem; margin-bottom: 2rem;
}
.cta-box h2 { font-family: var(--serif); font-size: 1.3rem; margin: 0 0 .4rem; font-weight: 600; }
.cta-box p { margin: 0 0 1rem; color: var(--ink-2); }
.cta-box .btn.ghost { margin-left: 0; margin-top: .5rem; }
.related h2 { font-size: .8rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 .75rem; font-family: var(--sans); }
.related ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .5rem; }
.related a { font-family: var(--serif); font-size: 1.1rem; }

/* ---------- Glossary ---------- */
.glossary dl { margin: 0; }
.glossary dt { font-family: var(--sans); font-weight: 700; font-size: 1.02rem; margin-top: 1.75rem; scroll-margin-top: 1rem; }
.glossary dd { margin: .3rem 0 0; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--rule); background: var(--paper-2); padding-block: 2.5rem; font-size: .9rem; color: var(--ink-3); }
.site-footer .wrap { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 2rem; }
.site-footer h3 { font-size: .75rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-2); margin: 0 0 .6rem; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .35rem; }
.site-footer a { color: var(--ink-2); text-decoration: none; }
.site-footer a:hover { color: var(--copper); }
.site-footer p { margin: 0 0 .5rem; max-width: 26rem; }

@media (max-width: 800px) {
  .hero { padding-block: 2.5rem 2rem; }
  .hero .wrap { grid-template-columns: 1fr; gap: 2rem; }
  .hero-art { max-width: 260px; }
  .facts ul { grid-template-columns: repeat(2, 1fr); }
  .guide-list { grid-template-columns: 1fr; }
  .site-footer .wrap { grid-template-columns: 1fr; }
  .prose { font-size: 1.08rem; }
  .btn.ghost { margin-left: 0; margin-top: .5rem; }
}