/* Maplefolio — bookish workshop specimen. Colour variants: change the six tokens below. */
:root {
  --paper: #f4e9e2;
  --paper-deep: #e7d0c4;
  --ink: #2b2a29;
  --ink-soft: #5a5551;
  --wine: #6e1f2e;
  --wine-deep: #4f1521;
  --rule: #cfb4a8;
  --on-wine: #fbf3ee;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --step: clamp(72px, 9vw, 128px);
  --gutter: clamp(20px, 4vw, 48px);
  --measure: 62ch;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.55 var(--serif);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-weight: 400; margin: 0; letter-spacing: -0.01em; text-wrap: balance; }
p { margin: 0 0 1em; }
a { color: var(--wine); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--wine-deep); }
:focus-visible { outline: 3px solid var(--wine); outline-offset: 3px; border-radius: 2px; }
::selection { background: var(--wine); color: var(--on-wine); }
.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}
.skip {
  position: absolute; left: var(--gutter); top: -100px; padding: 8px 12px;
  background: var(--wine); color: var(--on-wine); font-family: var(--sans); z-index: 20;
}
.skip:focus { top: 12px; }

.page { max-width: 1120px; margin-inline: auto; padding-inline: var(--gutter); }
.eyebrow, .note, .plate figcaption, .nav, .nav-toggle, label, legend, th, .foot-title {
  font-family: var(--sans);
}
.eyebrow {
  font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--wine); margin-bottom: 20px;
}

/* Masthead ----------------------------------------------------------------- */
.masthead {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--rule);
}
.bar { display: flex; align-items: center; gap: 28px; min-height: 64px; flex-wrap: wrap; }
.brand {
  font-family: var(--serif); font-style: italic; font-size: 1.35rem; text-decoration: none; color: var(--ink);
  margin-right: auto;
}
.nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 22px; }
.nav a { color: var(--ink); text-decoration: none; font-size: 0.875rem; padding: 6px 0; }
.nav a:hover { color: var(--wine); text-decoration: underline; }
.num { color: var(--wine); font-family: var(--serif); margin-right: 4px; }
.nav-toggle {
  display: none; align-items: center; gap: 10px; background: none; border: 1px solid var(--ink);
  color: var(--ink); font-size: 0.8125rem; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 8px 14px; cursor: pointer; border-radius: 999px;
}
.nav-toggle-mark { width: 16px; height: 2px; background: currentColor; position: relative; }
.nav-toggle-mark::before, .nav-toggle-mark::after {
  content: ""; position: absolute; left: 0; width: 16px; height: 2px; background: currentColor;
}
.nav-toggle-mark::before { top: -5px; }
.nav-toggle-mark::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-mark { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-mark::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-mark::after { top: 0; transform: rotate(-45deg); }

/* Hero --------------------------------------------------------------------- */
.hero {
  display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.9fr); gap: 48px; align-items: end;
  padding-block: clamp(40px, 6vw, 72px) var(--step);
}
h1 { font-size: clamp(2.5rem, 5.6vw, 4.6rem); line-height: 0.98; }
.hero .lede { font-size: 1.2rem; max-width: var(--measure); margin-top: 24px; }
.lede { font-size: 1.15rem; line-height: 1.5; color: var(--ink); max-width: var(--measure); }
.hero-links { display: flex; gap: 28px; flex-wrap: wrap; margin-top: 8px; }
.link-arrow { font-family: var(--sans); font-size: 0.9375rem; font-weight: 600; text-decoration: none; }
.link-arrow::after { content: " →"; }
.link-arrow:hover { text-decoration: underline; }

/* Plates (inline SVG figures) ---------------------------------------------- */
.plate { margin: 0; }
.plate svg { display: block; width: 100%; height: auto; }
.plate figcaption { font-size: 0.75rem; color: var(--ink-soft); margin-top: 10px; line-height: 1.45; }
.hero-plate { border: 1px solid var(--rule); padding: 20px 20px 16px; background: var(--paper-deep); }
.hero-plate svg { background: var(--paper); }
.sheet { fill: var(--paper); }
.sheet-grain { fill: url(#grain); }
.sheet-edge { fill: none; stroke: var(--ink); stroke-width: 1.25; }
.sheet-back { fill: var(--paper-deep); stroke: var(--ink); stroke-width: 1.25; }
.grain-line { stroke: var(--rule); stroke-width: 1; }
.crease { stroke: var(--wine); stroke-width: 1.5; stroke-dasharray: 5 4; }
.thread { fill: none; stroke: var(--wine); stroke-width: 2.25; stroke-linecap: round; }
.thread-inside { stroke-dasharray: 4 4; stroke-width: 1.5; }
.hole { fill: var(--ink); }
.plate-label { font: 11px var(--sans); fill: var(--ink-soft); }
.plate-small { margin-top: 28px; padding: 12px; border: 1px solid var(--rule); }
.plate-small svg { background: var(--paper-deep); }

/* Guides: numbered plates in a margin + text grid -------------------------- */
.guide {
  display: grid; grid-template-columns: minmax(0, 240px) minmax(0, 1fr); gap: 24px clamp(40px, 6vw, 96px);
  padding-block: var(--step);
  border-top: 1px solid var(--rule);
}
.guide .margin { position: sticky; top: 88px; align-self: start; }
.numeral {
  font-family: var(--serif); font-size: 4rem; line-height: 1; color: var(--wine); margin: 0 0 12px;
}
.guide h2 { font-size: 2rem; line-height: 1.1; margin-bottom: 14px; }
.marginal {
  font-family: var(--sans); font-size: 0.8125rem; line-height: 1.5; color: var(--ink-soft); max-width: 30ch;
  border-left: 2px solid var(--wine); padding-left: 12px;
}
.text { max-width: 68ch; }
.text ol, .text ul { padding-left: 1.3em; margin: 0 0 1em; }
.text li { margin-bottom: 0.55em; }
.text li::marker { color: var(--wine); font-family: var(--sans); font-size: 0.85em; }

details { border-top: 1px solid var(--rule); }
details:last-of-type { border-bottom: 1px solid var(--rule); }
summary {
  cursor: pointer; list-style: none; padding: 16px 0; font-family: var(--sans); font-weight: 600;
  font-size: 0.9375rem; display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: "+"; font-family: var(--serif); font-size: 1.4rem; line-height: 1; color: var(--wine);
  transition: transform 0.2s ease;
}
details[open] summary::after { transform: rotate(45deg); }
summary:hover { color: var(--wine); }
details > p, details > ol, details > ul { margin-bottom: 1.1em; }
details[open] > summary { padding-bottom: 6px; }

/* Calculator --------------------------------------------------------------- */
.calc-form {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 20px 28px; margin: 28px 0 12px;
}
.field { display: flex; flex-direction: column; gap: 8px; }
fieldset.field { border: 0; margin: 0; padding: 0; min-width: 0; }
legend, label { font-size: 0.8125rem; font-weight: 600; letter-spacing: 0.02em; color: var(--ink); }
legend { padding: 0; margin-bottom: 8px; }
fieldset.field label { font-weight: 400; display: flex; align-items: center; gap: 8px; }
.custom-size { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.custom-size legend { grid-column: 1 / -1; }
.custom-size label { flex-direction: column; align-items: stretch; font-weight: 600; }
input[type="number"], select {
  font: 400 1rem var(--mono); color: var(--ink); background: var(--paper);
  border: 1px solid var(--ink); border-radius: 2px; padding: 8px 10px; min-height: 42px; width: 100%;
}
select { appearance: none; -webkit-appearance: none; padding-right: 32px; background-image:
  linear-gradient(45deg, transparent 50%, var(--ink) 50%), linear-gradient(135deg, var(--ink) 50%, transparent 50%);
  background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%;
  background-size: 5px 5px; background-repeat: no-repeat;
}
input[type="radio"] { accent-color: var(--wine); width: 18px; height: 18px; margin: 0; }
input[type="range"] { accent-color: var(--wine); width: 100%; margin: 10px 0; }
output { font-family: var(--mono); color: var(--wine); }
.note { font-size: 0.8125rem; color: var(--ink-soft); line-height: 1.5; }
.calc-out {
  display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 28px; align-items: start; margin-top: 8px;
}
.plate-preview { border: 1px solid var(--rule); padding: 12px; background: var(--paper-deep); }
.plate-preview svg { background: var(--paper); }
.leaf { fill: url(#leaf-grain); stroke: var(--ink); stroke-width: 1.25; }
.spine-edge { stroke: var(--wine); stroke-width: 4; stroke-linecap: square; }
.spine-edge.bad { stroke-dasharray: 3 5; }

/* Tables ------------------------------------------------------------------- */
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.9375rem; }
th, td { text-align: left; padding: 10px 14px 10px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-size: 0.75rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); font-weight: 600; }
tbody th { font-family: var(--serif); text-transform: none; letter-spacing: 0; font-size: 1rem; color: var(--ink); }
td { font-family: var(--mono); font-size: 0.875rem; }
td.word { font-family: var(--serif); font-size: 0.9375rem; }
tr.current td, tr.current th { background: var(--paper-deep); }
.ok { color: var(--wine); font-weight: 600; }
.warn::before { content: "✕ "; }
.ok::before { content: "✓ "; }

/* Colophon ----------------------------------------------------------------- */
.colophon { background: var(--wine); color: var(--on-wine); padding-block: var(--step) 48px; margin-top: var(--step); }
.colophon a { color: var(--on-wine); }
.colophon-grid { display: grid; grid-template-columns: 1.4fr 1fr 0.7fr; gap: 40px; font-size: 0.9375rem; }
.brand-foot { font-style: italic; font-size: 1.6rem; margin-bottom: 12px; }
.foot-title { font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 12px; }
.foot-links { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.foot-links a { text-decoration: none; }
.foot-links a:hover, .foot-links a:focus-visible { text-decoration: underline; }
.colophon :focus-visible { outline-color: var(--on-wine); }

/* Responsive --------------------------------------------------------------- */
@media (max-width: 860px) {
  .guide { grid-template-columns: 1fr; gap: 20px; }
  .guide .margin { position: static; }
  .numeral { font-size: 3rem; }
  .hero { grid-template-columns: 1fr; align-items: start; }
  .hero-plate { max-width: 420px; }
  .calc-out { grid-template-columns: 1fr; }
  .plate-preview { max-width: 260px; }
  .colophon-grid { grid-template-columns: 1fr; gap: 32px; }
  .plate-small { max-width: 320px; }
}
@media (max-width: 720px) {
  .js .nav-toggle { display: inline-flex; }
  .js .nav { flex-basis: 100%; display: none; padding-bottom: 12px; }
  .js .nav.open { display: block; }
  .nav ul { flex-direction: column; gap: 0; }
  .nav a { display: block; padding: 12px 0; border-top: 1px solid var(--rule); font-size: 1rem; }
  .custom-size { grid-template-columns: 1fr; }
  th, td { padding-right: 10px; }
}
@media (max-width: 420px) {
  body { font-size: 1rem; }
  h1 { font-size: 2.35rem; }
  .hero .lede, .lede { font-size: 1.05rem; }
  .bar { min-height: 56px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}
@media print {
  .masthead, .skip { display: none; }
  details { border: 0; }
  .colophon { background: none; color: var(--ink); }
}