/* คู่มือกระดาษ: a white sheet laid on a green self-healing cutting mat */
:root {
  --mat: #24503e; --mat-line: rgba(255, 255, 255, .07); --mat-ink: #e7efe9;
  --sheet: #fffefa; --ink: #1c1f1d; --muted: #59615c; --rule: #dfe3dd; --soft: #f3f5f0;
  --acc: #1b6a4c; --cut: #d9692c; --hl: #fff4c7;
  --mono: ui-monospace, "Cascadia Mono", Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --mat: #0f1d17; --mat-line: rgba(255, 255, 255, .05); --mat-ink: #cfdcd4;
    --sheet: #1a1e1c; --ink: #e8ece9; --muted: #a3ada7; --rule: #303834; --soft: #222825;
    --acc: #7fd0ac; --cut: #f08a4f; --hl: #3a3420;
    color-scheme: dark;
  }
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; color: var(--ink); background-color: var(--mat);
  background-image: linear-gradient(var(--mat-line) 1px, transparent 1px), linear-gradient(90deg, var(--mat-line) 1px, transparent 1px);
  background-size: 24px 24px;
  font: 17px/1.7 "Leelawadee UI", "Noto Sans Thai", Tahoma, system-ui, sans-serif;
}
a { color: var(--acc); text-underline-offset: .18em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--cut); outline-offset: 2px; }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 20px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--sheet); color: var(--ink); padding: 8px 12px; z-index: 9; }
.skip:focus { left: 8px; }

.top { color: var(--mat-ink); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; font-weight: 700; font-size: 1.15rem; }
.brand svg { width: 30px; height: 30px; }
.nav { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; }
.nav a { display: block; padding: 8px 12px; color: var(--mat-ink); text-decoration: none; border-radius: 6px; font-weight: 600; }
.nav a:hover { background: rgba(255, 255, 255, .1); }
.nav a[aria-current] { background: var(--sheet); color: var(--ink); }

/* the sheet: crop marks at the corners, a millimetre ruler along the top */
.sheet { position: relative; max-width: 920px; margin: 4px auto 0; background: var(--sheet); border-radius: 3px; box-shadow: 0 1px 2px rgba(0, 0, 0, .25), 0 12px 30px rgba(0, 0, 0, .18); }
.sheet::before {
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 12px; border-bottom: 1px solid var(--rule);
  background-image: linear-gradient(90deg, var(--muted) 1px, transparent 1px), linear-gradient(90deg, var(--muted) 1px, transparent 1px);
  background-size: 40px 12px, 8px 5px; background-repeat: repeat-x; background-position: 20px 0, 20px 0; opacity: .5;
}
.sheet > .wrap { padding-top: 34px; padding-bottom: 48px; }
.crumbs { margin: 0 0 6px; font-size: .9rem; color: var(--muted); }
.crumbs a { color: var(--muted); }

h1, h2, h3 { line-height: 1.35; margin: 1.9em 0 .55em; }
h1 { font-size: clamp(1.6rem, 4.6vw, 2.15rem); margin-top: .2em; }
h2 { font-size: 1.4rem; padding-top: .9em; border-top: 1px dashed var(--rule); }
h3 { font-size: 1.12rem; }
p, ul, ol { margin: 0 0 1em; }
li { margin-bottom: .35em; }
.lead { font-size: 1.12rem; }
code, .mono { font-family: var(--mono); font-size: .92em; }

/* the answer card: dimensions people come for, in the biggest type on the page */
.answer { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); border-radius: 6px; overflow: hidden; margin: 1.2em 0 1.4em; }
.answer div { background: var(--soft); padding: 12px 14px; }
.answer b { display: block; font-size: 1.35rem; font-variant-numeric: tabular-nums; line-height: 1.3; }
.answer span { font-size: .9rem; color: var(--muted); }

.tbl { overflow-x: auto; margin: 0 0 1.2em; border: 1px solid var(--rule); border-radius: 6px; }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; font-size: .96rem; }
th, td { padding: 8px 12px; text-align: left; border-bottom: 1px solid var(--rule); white-space: nowrap; }
thead th { background: var(--soft); font-size: .88rem; color: var(--muted); font-weight: 600; }
tbody tr:last-child > * { border-bottom: 0; }
tbody th { font-weight: 700; }
tbody tr:hover { background: var(--soft); }
tr.mark { background: var(--hl); }
.note { font-size: .93rem; color: var(--muted); margin-top: -.6em; }
.tools-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin: .3em 0 .8em; font-size: .95rem; }

/* tools */
.tool { border: 2px solid var(--ink); border-radius: 8px; padding: 18px; margin: 1.2em 0 1.6em; background: var(--sheet); }
.tool h2, .tool h3 { margin-top: 0; padding-top: 0; border: 0; }
.fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
label { display: block; font-size: .92rem; font-weight: 600; margin-bottom: 4px; }
select, input[type=number] {
  width: 100%; min-height: 44px; font: inherit; color: var(--ink); background: var(--sheet);
  border: 1px solid var(--muted); border-radius: 6px; padding: 6px 10px;
}
fieldset { border: 0; padding: 0; margin: 0; }
legend { font-size: .92rem; font-weight: 600; margin-bottom: 4px; padding: 0; }
.radios { display: flex; gap: 14px; min-height: 44px; align-items: center; }
.radios label { display: flex; align-items: center; gap: 6px; font-weight: 400; margin: 0; }
.radios input { width: 18px; height: 18px; accent-color: var(--acc); }
.own { margin-top: 12px; }
.out { margin-top: 14px; padding: 12px 14px; background: var(--soft); border-left: 4px solid var(--cut); border-radius: 0 6px 6px 0; min-height: 4.6em; }
.out strong { display: block; font-size: 1.45rem; font-variant-numeric: tabular-nums; }
.out span { font-size: .93rem; color: var(--muted); }

figure { margin: 1.2em 0 1.6em; }
figure svg { width: 100%; height: auto; max-width: 560px; display: block; }
figcaption { font-size: .9rem; color: var(--muted); margin-top: 6px; }
.fig text { font-family: "Leelawadee UI", Tahoma, sans-serif; font-weight: 700; fill: var(--ink); }
.fig rect { fill: var(--sheet); stroke: var(--ink); stroke-width: 1.5; vector-effect: non-scaling-stroke; }
.fig .hi { fill: var(--hl); }

details.faq { border-bottom: 1px solid var(--rule); padding: 10px 0; }
details.faq summary { cursor: pointer; font-weight: 700; list-style-position: outside; }
details.faq p { margin: .6em 0 .2em; }
.src { font-size: .9rem; color: var(--muted); }

.foot { color: var(--mat-ink); font-size: .92rem; padding: 26px 0 40px; }
.foot ul { display: flex; flex-wrap: wrap; gap: 4px 18px; list-style: none; padding: 0; margin: 0 0 8px; }
.foot a { color: #fff; }
.foot p { margin: 0; opacity: .85; }

@media (max-width: 600px) {
  body { font-size: 16.5px; }
  .wrap { padding: 0 16px; }
  .sheet { margin: 0 8px; }
  .top .wrap { min-height: 56px; }
  .nav a { padding: 8px 10px; }
  th, td { padding: 7px 9px; }
  .tool { padding: 14px; }
  .answer { grid-template-columns: 1fr 1fr; }
  .answer div { padding: 10px 12px; }
  .answer b { font-size: 1.12rem; white-space: nowrap; }
}
@media print {
  body { background: #fff; }
  .top, .foot, .tool { display: none; }
  .sheet { box-shadow: none; }
}