/* Subtle Plane — one shared stylesheet. No web fonts, no external requests. */

:root {
  --paper: #f6f2ea;
  --card: #fffdf8;
  --ink: #23262a;
  --ink-soft: #4a5057;
  --steel: #27506b;
  --steel-deep: #1b3a4e;
  --oat: #e7dfcf;
  --rule: #d6cdbb;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.68;
  overflow-wrap: break-word;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--steel-deep);
  color: #ffffff;
  padding: 10px 16px;
  z-index: 50;
  font-family: var(--sans);
  border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

a { color: var(--steel-deep); }
a:hover { color: #112a39; }

:focus-visible {
  outline: 3px solid var(--steel);
  outline-offset: 2px;
}

/* ---------- header ---------- */

.site-head {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--card);
  border-bottom: 1px solid var(--rule);
}

.head-in {
  max-width: 980px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--ink);
  margin-right: auto;
}

.nav {
  display: flex;
  gap: 18px;
  font-family: var(--sans);
  font-size: 15px;
}
.nav a { color: var(--steel-deep); text-decoration: none; padding: 6px 2px; border-bottom: 2px solid transparent; }
.nav a:hover, .nav a:focus { border-bottom-color: var(--steel); }

.menu-btn {
  display: none;
  font-family: var(--sans);
  font-size: 15px;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 7px 12px;
  cursor: pointer;
}

/* ---------- layout ---------- */

.wrap {
  max-width: 660px;
  margin: 0 auto;
  padding: 0 20px 56px;
}

.wide { max-width: 860px; }

main { display: block; }

h1, h2, h3, h4 {
  font-family: var(--sans);
  line-height: 1.25;
  color: var(--ink);
}

h1 { font-size: 30px; margin: 34px 0 14px; }
h2 { font-size: 23px; margin: 38px 0 10px; }
h3 { font-size: 19px; margin: 28px 0 8px; }

p { margin: 0 0 18px; }

ul, ol { margin: 0 0 18px; padding-left: 24px; }
li { margin-bottom: 8px; }

.lede { font-size: 20px; color: var(--ink-soft); }

.step-mark {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 30px 0 0;
}

/* ---------- blocks ---------- */

.disclosure,
.callout,
.checklist,
.example,
.proscons,
.summary,
.glossary,
.procedure {
  background: var(--card);
  border: 1px solid var(--rule);
  border-left: 5px solid var(--steel);
  border-radius: 8px;
  padding: 18px 20px;
  margin: 26px 0;
}

.disclosure { border-left-color: #8a6a2f; }
.checklist { border-left-color: var(--steel-deep); }
.example { border-left-color: #5c6b57; }
.summary { border-left-color: #8a6a2f; }

.disclosure p:last-child,
.callout p:last-child,
.example p:last-child,
.summary p:last-child { margin-bottom: 0; }

.block-title {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 8px;
}

.aff-note {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink-soft);
  margin: 6px 0 18px;
}

.toc {
  background: var(--oat);
  border-radius: 8px;
  padding: 16px 20px;
  margin: 22px 0 30px;
}
.toc p { font-family: var(--sans); font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-soft); margin: 0 0 8px; }
.toc ol { margin: 0; }

/* static checklist boxes — no state is stored */
.boxes { list-style: none; padding-left: 0; }
.boxes li {
  position: relative;
  padding-left: 32px;
  margin-bottom: 12px;
}
.boxes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 15px;
  height: 15px;
  border: 1.5px solid var(--steel-deep);
  border-radius: 3px;
  background: #ffffff;
}

.glossary dt { font-family: var(--sans); font-weight: 600; font-size: 16px; margin-top: 12px; }
.glossary dd { margin: 4px 0 0; }
.glossary dl { margin: 0; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 17px;
}
caption {
  font-family: var(--sans);
  font-size: 14px;
  text-align: left;
  color: var(--ink-soft);
  padding-bottom: 8px;
}
th, td {
  border: 1px solid var(--rule);
  padding: 9px 11px;
  text-align: left;
  vertical-align: top;
}
th { background: var(--oat); font-family: var(--sans); font-size: 15px; }

.steplist { padding-left: 22px; }
.steplist li { margin-bottom: 14px; }
.steplist a { font-family: var(--sans); font-weight: 600; text-decoration: none; }
.steplist a:hover { text-decoration: underline; }
.steplist span { display: block; font-size: 17px; color: var(--ink-soft); }

.pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  border-top: 1px solid var(--rule);
  margin-top: 40px;
  padding-top: 18px;
  font-family: var(--sans);
  font-size: 16px;
}

.printbtn {
  font-family: var(--sans);
  font-size: 16px;
  background: var(--steel-deep);
  color: #ffffff;
  border: 0;
  border-radius: 8px;
  padding: 11px 18px;
  cursor: pointer;
}
.printbtn:hover { background: #122836; }

.mark {
  display: block;
  margin: 24px auto;
  max-width: 100%;
}

/* ---------- footer ---------- */

.site-foot {
  border-top: 1px solid var(--rule);
  background: var(--card);
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.6;
}
.foot-in {
  max-width: 860px;
  margin: 0 auto;
  padding: 26px 20px 40px;
}
.foot-in address { font-style: normal; margin-bottom: 12px; }
.foot-in .pub { font-weight: 600; color: var(--ink); }
.foot-links { margin: 0 0 12px; }
.foot-links a { color: var(--steel-deep); }
.foot-tm { margin: 0 0 10px; }
.foot-rev { margin: 0; }

/* ---------- wide screens: step numbers in the margin ---------- */

@media (min-width: 1080px) {
  .wrap { position: relative; }
  .marginal {
    position: absolute;
    left: -132px;
    width: 110px;
    text-align: right;
    font-family: var(--sans);
    font-size: 13px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ink-soft);
  }
}
@media (max-width: 1079px) {
  .marginal { display: none; }
}

/* ---------- small screens ---------- */

@media (max-width: 620px) {
  body { font-size: 17px; }
  h1 { font-size: 26px; }
  h2 { font-size: 21px; }
  .menu-btn { display: inline-block; }
  .nav {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0;
    border-top: 1px solid var(--rule);
    margin-top: 8px;
    padding-top: 6px;
  }
  .nav.open { display: flex; }
  .nav a { padding: 10px 0; }
}

/* ---------- print ---------- */

@media print {
  body { background: #ffffff; font-size: 12pt; }
  .site-head, .pager, .printbtn, .skip, .toc { display: none !important; }
  .wrap { max-width: 100%; padding: 0; }
  .checklist, .callout, .summary, .example {
    border: 1px solid #999999;
    border-left: 3px solid #333333;
    break-inside: avoid;
    page-break-inside: avoid;
  }
  h2 { break-after: avoid; page-break-after: avoid; }
  .boxes li::before { border-color: #333333; }
  .site-foot { border-top: 1px solid #999999; font-size: 9pt; }
  a { color: #000000; text-decoration: none; }
}