/* Light theme. Text pairs checked for WCAG AA contrast. No webfonts: the system stack loads nothing. */
:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --ink: #1b1d22;
  --ink-2: #4a4f5a;      /* 7.6:1 on --bg */
  --line: #dcd9d1;
  --accent: #1f5f8b;     /* 6.6:1 on white */
  --accent-soft: #e6eff6;
  --warn-bg: #fff4e0;
  --warn-ink: #6b4100;   /* 7.9:1 on --warn-bg */
  --err-bg: #fdecec;
  --err-ink: #8a1c1c;
  --radius: 6px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.55 var(--font); }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
code { font-family: var(--mono); font-size: 0.88em; }
h1 { font-size: clamp(1.6rem, 4vw, 2.3rem); line-height: 1.15; margin: 0.4em 0 0.3em; letter-spacing: -0.01em; }
h2 { font-size: 1.3rem; margin: 2em 0 0.5em; }
h3 { font-size: 1.05rem; margin: 0 0 0.3em; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.muted { color: var(--ink-2); }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 8px; background: var(--surface); padding: 6px 10px; z-index: 10; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* header */
.top { background: var(--surface); border-bottom: 1px solid var(--line); }
.top-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 20px; padding-top: 10px; padding-bottom: 10px; }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--ink); text-decoration: none; }
.top-search { display: flex; flex: 1 1 260px; gap: 6px; }
.top-search input { flex: 1; min-width: 0; }
.top-nav { display: flex; gap: 16px; font-size: 0.95rem; }

/* forms */
input, button { font: inherit; }
input[type=search], input[type=text], input[type=number], input:not([type]) {
  border: 1px solid #b9b5ab; border-radius: var(--radius); padding: 7px 10px; background: var(--surface); color: var(--ink);
}
button { border: 1px solid var(--accent); background: var(--accent); color: #fff; border-radius: var(--radius); padding: 7px 14px; cursor: pointer; }
button:hover { background: #174a6d; }
label { display: block; }

/* home */
.hero { padding: 24px 0 8px; }
.lede { font-size: 1.1rem; color: var(--ink-2); max-width: 70ch; }
.big-search label { font-weight: 600; display: block; margin: 18px 0 6px; }
.big-search .row { display: flex; gap: 8px; max-width: 720px; }
.big-search input { flex: 1; min-width: 0; font-size: 1.1rem; padding: 10px 12px; }
.big-search button { font-size: 1.05rem; padding: 10px 18px; }
.examples-label { margin: 14px 0 4px; color: var(--ink-2); }
.examples { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px 14px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.card p { margin: 0 0 10px; color: var(--ink-2); font-size: 0.95rem; }
.card label { margin: 0 0 10px; font-size: 0.92rem; }
.card label input:not([type=checkbox]) { display: block; width: 100%; margin-top: 3px; }
.card label.check { display: flex; gap: 8px; align-items: baseline; }
.card h2 { margin-top: 0; }
.thresholds { max-width: 460px; margin-top: 28px; }
.inline-form { display: flex; flex-wrap: wrap; align-items: end; gap: 8px; margin: 14px 0; }
.inline-form label input { margin-left: 4px; max-width: 220px; }

/* content */
.crumbs { margin-top: 18px; font-size: 0.92rem; color: var(--ink-2); }
.facts { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 6px 22px; }
.facts .k, .stat .k { color: var(--ink-2); font-size: 0.85rem; display: block; }
.stats { display: flex; flex-wrap: wrap; gap: 12px; margin: 10px 0 14px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 14px; min-width: 180px; }
.stat .v { font-size: 1.35rem; font-weight: 650; font-variant-numeric: tabular-nums; }
.note { background: var(--warn-bg); color: var(--warn-ink); padding: 8px 12px; border-radius: var(--radius); max-width: 80ch; }
.warn { color: var(--warn-ink); }
.error { background: var(--err-bg); color: var(--err-ink); padding: 10px 14px; border-radius: var(--radius); }
.definition { color: var(--ink-2); max-width: 80ch; font-size: 0.95rem; border-left: 3px solid var(--line); padding-left: 10px; }
.tag { display: inline-block; font-size: 0.75rem; line-height: 1.4; padding: 0 6px; border-radius: 999px; background: var(--accent-soft); color: #164566; white-space: nowrap; vertical-align: 1px; }
details { margin: 12px 0; }
summary { cursor: pointer; color: var(--accent); }
.columns { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 0 28px; }

/* tables */
.table-scroll { overflow-x: auto; max-width: 100%; }
table { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; font-size: 0.95rem; background: var(--surface); }
caption { text-align: left; color: var(--ink-2); padding: 6px 0; font-size: 0.9rem; }
th, td { text-align: left; padding: 6px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; font-size: 0.85rem; color: var(--ink-2); background: #f3f1ec; }
.r { text-align: right; }
table.pct td, table.pct th { text-align: center; }
.ratings td { white-space: nowrap; }
.ratings td:first-child { white-space: normal; }
meter { width: 90px; height: 10px; vertical-align: middle; }
meter::-webkit-meter-bar { background: #ebe8e1; border: 0; border-radius: 3px; }
meter::-webkit-meter-optimum-value { background: var(--accent); border-radius: 3px; }
meter::-moz-meter-bar { background: var(--accent); }
.num { display: inline-block; min-width: 2.5em; text-align: right; }

/* lists */
.software { columns: 2 260px; padding-left: 18px; }
.occ-list { columns: 2 320px; padding-left: 18px; }
.occ-list li, .software li { break-inside: avoid; }
.related { columns: 2 320px; }
.choices li { margin: 6px 0; }
/* stepping stones: cards joined by arrows, across on wide screens, down on narrow ones */
.chain { list-style: none; padding: 0; margin: 14px 0; display: flex; align-items: stretch; }
.chain-step { position: relative; display: flex; flex-direction: column; gap: 2px; flex: 1 1 0; min-width: 0; max-width: 250px; padding: 12px 14px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); margin-right: 44px; }
.chain-step:last-child { margin-right: 0; }
.chain-step:not(:last-child)::after { content: "\2192"; position: absolute; right: -36px; top: 50%; transform: translateY(-50%);
  font-size: 1.6rem; line-height: 1; color: var(--accent); }
.chain-start { border-color: #c4561f; }
.chain-goal { border-color: var(--accent); border-width: 2px; }
.chain-label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-2); }
.chain-title { font-weight: 650; line-height: 1.3; }
.chain-meta { font-size: 0.88rem; color: var(--ink-2); }
.chain-diff { font-size: 0.85rem; font-variant-numeric: tabular-nums; }
.chain-diff.up { color: #1d6b38; }   /* 6.1:1 on white */
.chain-diff.down { color: var(--err-ink); }
@media (max-width: 820px) {  /* up to 5 cards fit across above this width */
  .chain { flex-direction: column; }
  .chain-step { width: 100%; max-width: none; margin: 0 0 40px; }
  .chain-step:last-child { margin-bottom: 0; }
  .chain-step:not(:last-child)::after { content: "\2193"; right: auto; left: 50%; top: auto; bottom: -34px; transform: translateX(-50%); }
}
.toc ul { columns: 3 220px; padding-left: 18px; font-size: 0.92rem; }

/* intent */
.intent { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 14px; margin: 10px 0 16px; }
.intent-line { margin: 0; }
.intent-details { margin: 4px 0 0; font-size: 0.88rem; }
.intent-fields { margin: 8px 0 0; display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; font-size: 0.92rem; }
.intent-fields div { display: contents; }
.intent-fields dt { color: var(--ink-2); }
.intent-fields dd { margin: 0; }
.intent-fields .code { color: var(--ink-2); font-size: 0.88em; font-variant-numeric: tabular-nums; white-space: nowrap; margin-left: 4px; }
.code-note { margin: 8px 0 2px; color: var(--ink-2); font-size: 0.85rem; max-width: 80ch; }
@media (max-width: 560px) { .intent-fields { grid-template-columns: 1fr; gap: 0; } .intent-fields dd { margin-bottom: 6px; } }

/* graph */
.graph { height: 460px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); margin: 12px 0 4px; }
.legend { font-size: 0.88rem; }
.link-button { background: none; border: 0; padding: 0; color: var(--accent); text-decoration: underline; text-underline-offset: 2px; font-size: inherit; }
.link-button:hover { background: none; text-decoration-thickness: 2px; }
.link-button[hidden] { display: none; }

/* footer */
.foot { border-top: 1px solid var(--line); margin-top: 56px; padding: 18px 0 28px; font-size: 0.85rem; color: var(--ink-2); background: var(--surface); }
.foot p { max-width: 90ch; }

@media (max-width: 560px) {
  .top-nav { width: 100%; justify-content: space-between; }
  .graph { height: 340px; }
  .stat { min-width: 0; flex: 1 1 140px; }
}

/* plan */
.plan-form { max-width: 620px; margin-top: 18px; }
.plan-form label { margin: 0 0 12px; font-weight: 600; }
.plan-form label .muted { font-weight: 400; }
.plan-form input { display: block; width: 100%; margin-top: 4px; font-size: 1.05rem; padding: 9px 12px; }
.plan-form button { font-size: 1.05rem; padding: 9px 18px; }
.field-step, .step, .steps span {
  display: inline-flex; align-items: center; justify-content: center; width: 1.6em; height: 1.6em;
  border-radius: 50%; background: var(--accent); color: #fff; font-size: 0.8em; font-weight: 700; margin-right: 4px;
}
.three { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin-top: 30px; }
.three h2 { margin: 0 0 8px; font-size: 1.1rem; }
.three p { margin: 0; }
.ask-one { margin-top: 12px; }
.steps { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 8px 0 4px; font-size: 0.95rem; }
.steps a { text-decoration: none; color: var(--ink); }
.steps a:hover { color: var(--accent); }
.plan-section { border-top: 2px solid var(--line); margin-top: 24px; }
.plan-section h2 { margin: 16px 0 4px; font-size: 1.5rem; }
.plan-section h3 { margin-top: 1.6em; }
.result-list { padding-left: 20px; }
.result-list li { margin: 6px 0; }
.goal-link { font-size: 0.85rem; white-space: nowrap; margin-left: 4px; }
.zones td, .zones th[scope=row] { white-space: normal; min-width: 180px; font-size: 0.92rem; }
.zone-text dt { font-weight: 600; margin-top: 8px; }
.zone-text dd { margin: 2px 0 0; max-width: 80ch; }
/* plan subsections fold behind a caret; the summary line says what's inside */
.fold { margin: 10px 0 0; border-bottom: 1px solid var(--line); }
.fold > summary { list-style: none; display: flex; flex-wrap: wrap; align-items: baseline; gap: 2px 10px;
  padding: 8px 0; color: var(--ink); }
.fold > summary::-webkit-details-marker { display: none; }
.fold > summary::before { content: "\25B6"; font-size: 0.75em; color: var(--accent); width: 1.4em; flex: none; transition: transform 0.15s; display: inline-block; }
.fold[open] > summary::before { transform: rotate(90deg); }
.fold > summary h3 { display: inline; margin: 0; }
.fold > summary:hover h3 { color: var(--accent); }
.teaser { color: var(--ink-2); font-size: 0.92rem; }
.fold-body { padding: 0 0 10px 1.6em; }
.fold-body > :first-child { margin-top: 0; }
.how { margin: 2px 0 8px; font-size: 0.92rem; }
.how > summary { font-size: 0.88rem; }
.how p { color: var(--ink-2); max-width: 80ch; margin: 4px 0 0; border-left: 3px solid var(--line); padding-left: 10px; }
.plan-section .result-list { margin: 6px 0; }
.plan-section .stats { margin: 6px 0 8px; }
@media (prefers-reduced-motion: reduce) { .fold > summary::before { transition: none; } }
.pay-compare { font-size: 1.1rem; max-width: 70ch; margin: 10px 0 6px; }
.pay-compare strong { font-variant-numeric: tabular-nums; }
.pay-compare .up { color: #1d6b38; }   /* 6.6:1 on --bg */
.pay-compare .down { color: var(--err-ink); }
/* search: what's settled, then one form for every open choice */
.checklist { list-style: none; padding: 10px 14px; margin: 14px 0 20px; background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius); max-width: 760px; }
.checklist li { display: flex; flex-wrap: wrap; gap: 2px 10px; padding: 3px 0; align-items: baseline; }
.checklist li::before { flex: none; width: 1.2em; font-weight: 700; }
.checklist li.done::before { content: "\2713"; color: #1d6b38; }
.checklist li.todo::before { content: "\2022"; color: #c4561f; }
.checklist .asked { color: var(--ink-2); }
.checklist .role, .choose .role { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--ink-2); min-width: 10em; }
.choose-form { max-width: 760px; }
fieldset.choose { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); padding: 10px 16px 6px; margin: 0 0 16px; }
fieldset.choose legend { float: left; width: 100%; padding: 0; margin: 0 0 4px; font-weight: 650; font-size: 1.05rem; }
fieldset.choose legend + * { clear: left; }
fieldset.choose legend .role { display: block; min-width: 0; font-weight: 400; }
.more-choices { margin: 0 0 8px; }
.more-choices > summary { font-size: 0.92rem; padding: 2px 6px; }
.choose .choices { list-style: none; padding: 0; margin: 6px 0; }
.choose .choices li { margin: 0; }
.choose .choices label { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0 8px; padding: 5px 6px; border-radius: var(--radius); cursor: pointer; }
.choose .choices label:hover { background: var(--accent-soft); }
.choose .choices input { margin: 0 4px 0 0; accent-color: var(--accent); }
.choice-title { font-weight: 600; }
.choice-detail { color: var(--ink-2); font-size: 0.88rem; flex-basis: 100%; padding-left: 1.6em; }
.choose .retry input { display: block; width: 100%; max-width: 420px; margin-top: 4px; }
.choose .retry { margin: 6px 0 10px; }
.choose-form button { font-size: 1.05rem; padding: 9px 18px; }
.choices.links { padding-left: 20px; list-style: disc; }
.start-over { margin-top: 24px; }
@media (max-width: 560px) { .checklist .role { min-width: 0; } }