/* Site styles. Colours live in the first block, so a colour change only needs one edit. */
:root {
  --ink: #171a2e;
  --panel: #20243f;
  --field: #12152a;
  --line: #474e78;
  --text: #f0f1f8;
  --muted: #b6bbd4;
  --accent: #ffc24b;
  --on-accent: #231a04;
  --paper: #eceef7;
  --on-paper: #1a1d30;
  --radius: 6px;
  --page: 1120px;
  color-scheme: dark;
}
@font-face {
  font-family: Archivo;
  src: url(fonts/archivo.woff2) format("woff2");
  font-weight: 100 900;
  font-stretch: 100% 125%;
  font-display: swap;
}
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font: 400 1.0625rem/1.6 Archivo, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
main { flex: 1; width: 100%; }
.wrap { width: min(var(--page), 100% - 40px); margin-inline: auto; }
h1, h2, h3 { line-height: 1.12; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(2.2rem, 6vw, 3.5rem); font-weight: 800; font-stretch: 118%; letter-spacing: -.015em; }
h2 { font-size: clamp(1.4rem, 3vw, 1.75rem); font-weight: 700; font-stretch: 110%; }
h3 { font-size: 1.1rem; font-weight: 700; }
p { margin: 0; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--accent); color: var(--on-accent); padding: 8px 14px; font-weight: 700; z-index: 5; }
.skip:focus { left: 16px; }
.lead { color: var(--muted); font-size: 1.15rem; max-width: 62ch; margin-top: 14px; }

/* Header */
.site-head { border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; gap: 8px 24px; flex-wrap: wrap; padding-block: 14px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 800; font-stretch: 120%; font-size: 1.2rem; }
.brand svg { width: 28px; height: 28px; flex: none; }
.main-nav { display: flex; gap: 4px 20px; flex-wrap: wrap; }
.main-nav a { color: var(--text); text-decoration: none; padding: 6px 0; }
.main-nav a:hover, .main-nav a[aria-current] { color: var(--accent); }
.calc-nav { border-bottom: 1px solid var(--line); }
.calc-nav ul { display: flex; gap: 6px 22px; list-style: none; margin: 0; padding: 0; overflow-x: auto; scrollbar-width: none; }
.calc-nav a { display: block; padding: 11px 0 9px; color: var(--muted); text-decoration: none; white-space: nowrap; border-bottom: 3px solid transparent; }
.calc-nav a:hover { color: var(--text); }
.calc-nav a[aria-current] { color: var(--text); border-bottom-color: var(--accent); font-weight: 600; }

/* Page intro */
.intro { padding-block: 40px 28px; }

/* Calculator layout */
.workbench { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 420px); gap: 32px; align-items: start; padding-bottom: 36px; }
.workbench + .workbench { border-top: 1px solid var(--line); padding-top: 36px; }
.workbench h2 { margin-bottom: 18px; }
.fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 20px; }
.field { min-width: 0; }
.field.wide { grid-column: 1 / -1; }
.field label, .legend { display: block; font-weight: 600; margin-bottom: 6px; padding: 0; }
.hint { color: var(--muted); font-size: .9rem; margin-top: 5px; }
.input { display: flex; align-items: stretch; background: var(--field); border: 1px solid var(--line); border-radius: var(--radius); }
.input:focus-within { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.input input { flex: 1; min-width: 0; width: 100%; background: none; border: 0; color: var(--text); font: inherit; font-size: 1.15rem; font-variant-numeric: tabular-nums; padding: 11px 12px; outline: none; }
.input input::placeholder { color: #8f95b5; }
.input .unit { display: flex; align-items: center; padding-right: 12px; color: var(--muted); }
.input.bad { border-color: var(--text); box-shadow: 0 0 0 1px var(--text); }
.err { display: flex; gap: 7px; margin-top: 6px; font-size: .95rem; font-weight: 600; color: var(--text); }
.err::before { content: "!"; flex: none; width: 1.3em; height: 1.3em; margin-top: .12em; border-radius: 50%; background: var(--text); color: var(--ink); font-size: .85em; font-weight: 800; line-height: 1.3em; text-align: center; }
.err[hidden] { display: none; }
.switch { border: 0; padding: 0; margin: 0 0 18px; min-width: 0; }
.switch .options { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.switch label { position: relative; cursor: pointer; }
.switch input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.switch span { display: block; padding: 8px 14px; color: var(--muted); }
.switch input:checked + span { background: var(--accent); color: var(--on-accent); font-weight: 600; }
.switch input:focus-visible + span { outline: 3px solid var(--text); outline-offset: -3px; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.btn { font: inherit; font-weight: 600; cursor: pointer; border-radius: var(--radius); padding: 10px 16px; border: 1px solid var(--line); background: transparent; color: var(--text); min-height: 44px; }
.btn:hover:not(:disabled) { border-color: var(--text); }
.btn:disabled { cursor: not-allowed; opacity: .55; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn.primary:hover:not(:disabled) { filter: brightness(1.08); }

/* Purchases list. The height holds the space for the first three rows while the page loads. */
[data-rows] { min-height: 321px; }
.row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) 44px; gap: 10px 12px; align-items: start; padding-block: 12px; border-bottom: 1px solid var(--line); }
.row:first-child { padding-top: 0; }
.row .remove { padding: 0; width: 44px; height: 53px; margin-top: 33px; font-size: 1.3rem; line-height: 1; }
.row .err { grid-column: 1 / -1; margin-top: 0; }

/* The result ticket: the one loud thing on the page */
.ticket-hold { position: sticky; top: 16px; }
.ticket { position: relative; border-radius: var(--radius) var(--radius) 0 0; padding: 22px 24px 30px; margin-bottom: 10px; background: var(--accent); color: var(--on-accent); }
.ticket::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -10px; height: 10px;
  background: radial-gradient(circle at 10px 10px, transparent 7px, var(--tear) 7.5px) 0 0 / 20px 10px repeat-x;
}
.ticket { --tear: var(--accent); }
.ticket[data-tone="loss"] { --tear: var(--paper); background: var(--paper); color: var(--on-paper); }
.ticket[data-state="idle"] { --tear: var(--panel); background: var(--panel); color: var(--text); }
.t-idle { color: var(--muted); }
.ticket[data-state="ok"] .t-idle { display: none; }
.t-label { font-weight: 700; font-size: 1.05rem; }
.t-main { font-weight: 800; font-stretch: 125%; font-variant-numeric: tabular-nums; font-size: clamp(2.4rem, 7vw, 3.1rem); line-height: 1.1; letter-spacing: -.01em; overflow-wrap: anywhere; margin-top: 4px; }
.t-main[data-long="1"] { font-size: clamp(1.8rem, 5vw, 2.2rem); }
.t-main[data-long="2"] { font-size: 1.4rem; }
.t-sub { font-weight: 500; margin-top: 6px; }
.t-rows { margin: 16px 0 0; border-top: 2px dashed currentColor; padding-top: 12px; }
.t-rows div { display: flex; justify-content: space-between; gap: 16px; padding-block: 3px; }
.t-rows dt { font-weight: 500; }
.t-rows dd { margin: 0; font-weight: 700; font-variant-numeric: tabular-nums; text-align: right; overflow-wrap: anywhere; min-width: 0; }
.t-notes { margin: 12px 0 0; padding: 10px 0 0; list-style: none; font-weight: 600; border-top: 2px dashed currentColor; }
.ticket-tools { margin-top: 18px; }
.ticket .btn { width: 100%; border-color: currentColor; color: inherit; }
.ticket[data-state="ok"] .btn { background: var(--on-accent); border-color: var(--on-accent); color: #fff; }
.ticket[data-state="ok"][data-tone="loss"] .btn { background: var(--on-paper); border-color: var(--on-paper); }
.ticket .btn:focus-visible { outline-color: currentColor; }
.ticket[data-state="ok"] :focus-visible { outline-color: var(--on-paper); }

/* Long reading */
.prose { padding-block: 36px 8px; border-top: 1px solid var(--line); }
.prose > * { max-width: 70ch; }
.prose h2 { margin: 34px 0 10px; }
.prose h2:first-child { margin-top: 0; }
.prose p + p { margin-top: 12px; }
.prose ul, .prose ol { padding-left: 1.3em; margin: 12px 0 0; }
.prose li + li { margin-top: 6px; }
.prose ul + p { margin-top: 12px; }
.formula { background: var(--panel); border-left: 4px solid var(--accent); padding: 12px 16px; margin: 14px 0; font-weight: 600; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.formula p + p { margin-top: 6px; }
.steps { width: 100%; max-width: 70ch; border-collapse: collapse; margin: 14px 0; font-variant-numeric: tabular-nums; }
.steps th, .steps td { text-align: left; padding: 8px 12px 8px 0; border-bottom: 1px solid var(--line); vertical-align: top; font-weight: 400; }
.steps td:last-child { text-align: right; padding-right: 0; font-weight: 600; white-space: nowrap; }
.steps tr:last-child th, .steps tr:last-child td { font-weight: 700; }
details { border-bottom: 1px solid var(--line); }
details:first-of-type { border-top: 1px solid var(--line); margin-top: 12px; }
summary { cursor: pointer; font-weight: 600; padding: 13px 0; }
details p { padding-bottom: 14px; color: var(--muted); }
.more { padding-block: 34px 44px; }
.more h2 { margin-bottom: 12px; }
.more ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px 26px; }

/* Home */
.hero { padding-block: clamp(44px, 9vw, 84px) 36px; }
.hero h1 { font-size: clamp(2.5rem, 8.5vw, 5rem); max-width: 15ch; line-height: 1.03; }
.calc-list { list-style: none; margin: 0; padding: 0; border-top: 2px solid var(--text); }
.calc-list li { border-bottom: 1px solid var(--line); }
.calc-list a { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 4px 32px; align-items: center; padding: 20px 0; text-decoration: none; color: var(--text); }
.calc-list h2 { font-size: clamp(1.25rem, 3vw, 1.6rem); }
.calc-list a:hover h2 { color: var(--accent); }
.calc-list p { color: var(--muted); margin-top: 5px; }
.calc-list .sample { margin: 0; color: var(--text); font-weight: 600; font-variant-numeric: tabular-nums; text-align: right; }
.facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px 32px; padding-block: 44px; }
.facts p { color: var(--muted); margin-top: 6px; }

/* Forms on Premium and About */
.stack { display: grid; gap: 16px; max-width: 480px; margin-top: 18px; }
.stack label { font-weight: 600; display: block; margin-bottom: 6px; }
.stack textarea { resize: vertical; min-height: 130px; }
.stack .box { width: 100%; font: inherit; color: var(--text); background: var(--field); border: 1px solid var(--line); border-radius: var(--radius); padding: 11px 12px; }
.stack .box:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.stack .trap { position: absolute; left: -9999px; }
.form-msg { font-weight: 600; }
.form-msg:empty { display: none; }
.fine { color: var(--muted); font-size: .92rem; }

/* Reserved money spots. Hidden until you turn them on. */
.slot[hidden] { display: none; }
.slot { border: 2px dashed var(--line); border-radius: var(--radius); padding: 14px; margin-block: 24px; text-align: center; color: var(--muted); }
.slot.ad { min-height: 120px; display: grid; place-content: center; }
.slot .paid { color: var(--text); font-weight: 600; margin-bottom: 8px; }

/* Footer */
.site-foot { border-top: 1px solid var(--line); margin-top: 28px; padding-block: 26px 34px; color: var(--muted); font-size: .95rem; }
.site-foot strong { color: var(--text); font-weight: 600; }
.site-foot p + p { margin-top: 5px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 4px 20px; margin-top: 12px; }

@media (max-width: 860px) {
  .workbench { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .ticket-hold { position: static; }
  .facts { grid-template-columns: minmax(0, 1fr); }
  .calc-list a { grid-template-columns: minmax(0, 1fr); }
  .calc-list .sample { text-align: left; margin-top: 8px; }
}
@media (max-width: 460px) {
  .wrap { width: calc(100% - 32px); }
  .fields { grid-template-columns: minmax(0, 1fr); }
  .field { grid-column: 1 / -1; }
  .row { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) 44px; gap: 8px; }
  .intro { padding-top: 28px; }
}
@media print {
  .site-head, .calc-nav, .actions, .more, .ticket .btn { display: none; }
  body { background: #fff; color: #000; }
}