/* FigurePK. Layout idea: a clean ledger. Each tool is one card with inputs on the left and a results "receipt" on the right; figures set in a monospace face so columns line up. */
:root {
  --paper: #F4F6F3;
  --card: #FFFFFF;
  --ink: #15211D;
  --muted: #56645E;
  --line: #DDE3DF;
  --brand: #0E6B57;
  --brand-soft: #E2F0EB;
  --saffron: #E39B2D;
  --saffron-soft: #FCF1DF;
  --ok: #157A4C;
  --warn: #B4531E;
  --shadow: 0 1px 2px rgba(21,33,29,.05), 0 8px 24px rgba(21,33,29,.06);
  --font-body: "Plus Jakarta Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-num: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0F1513; --card: #17201D; --ink: #E4ECE8; --muted: #9AAAA3; --line: #2A3631;
    --brand: #5CC9A8; --brand-soft: #1A3029; --saffron: #F0B55A; --saffron-soft: #33281A;
    --ok: #5CC9A8; --warn: #F0A06A; --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0F1513; --card: #17201D; --ink: #E4ECE8; --muted: #9AAAA3; --line: #2A3631;
  --brand: #5CC9A8; --brand-soft: #1A3029; --saffron: #F0B55A; --saffron-soft: #33281A;
  --ok: #5CC9A8; --warn: #F0A06A; --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
  color-scheme: dark;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font-body); font-size: 1rem; line-height: 1.6; }
a { color: var(--brand); text-underline-offset: 3px; }
:focus-visible { outline: 3px solid var(--saffron); outline-offset: 2px; border-radius: 6px; }
h1, h2, h3 { line-height: 1.2; text-wrap: balance; margin: 0; letter-spacing: -0.02em; }
h1 { font-size: clamp(1.9rem, 1.4rem + 2.2vw, 2.8rem); font-weight: 800; }
h2 { font-size: clamp(1.3rem, 1.1rem + .7vw, 1.6rem); font-weight: 750; }
h3 { font-size: 1.08rem; font-weight: 700; }
.wrap { width: min(1100px, 100% - 32px); margin-inline: auto; }
.narrow { width: min(820px, 100% - 32px); margin-inline: auto; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 12px; background: var(--card); padding: 8px 12px; z-index: 10; }
.num, .result-value, td.n { font-family: var(--font-num); font-variant-numeric: tabular-nums; }

/* Header / footer */
.site-header { background: var(--card); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 64px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-weight: 800; font-size: 1.25rem; letter-spacing: -0.02em; }
.brand b { color: var(--brand); }
.brand-mark { width: 34px; height: 34px; flex: none; }
.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a { color: var(--muted); text-decoration: none; font-weight: 700; font-size: .93rem; padding: 8px 12px; border-radius: 10px; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); background: var(--brand-soft); }
.site-footer { border-top: 1px solid var(--line); margin-top: 64px; padding: 32px 0 40px; color: var(--muted); font-size: .9rem; }
.site-footer .cols { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 24px; }
.site-footer h3 { font-size: .9rem; color: var(--ink); margin-bottom: 8px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 4px; }
.site-footer a { color: var(--muted); }

/* Home */
.hero { padding: 48px 0 24px; }
.hero p.lead { font-size: 1.15rem; color: var(--muted); max-width: 40em; margin: 14px 0 22px; }
.search { position: relative; max-width: 520px; }
.search input { width: 100%; font: inherit; font-size: 1.05rem; padding: 14px 16px 14px 46px; border-radius: 14px; border: 1.5px solid var(--line); background: var(--card); color: var(--ink); }
.search input:focus { border-color: var(--brand); outline: none; box-shadow: 0 0 0 4px var(--brand-soft); }
.search svg { position: absolute; left: 15px; top: 50%; transform: translateY(-50%); width: 20px; height: 20px; color: var(--muted); }
.cat { margin-top: 36px; }
.cat h2 { font-size: 1.15rem; margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
.cat h2::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.tool-grid { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.tool-card { display: flex; gap: 14px; align-items: flex-start; height: 100%; padding: 18px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; text-decoration: none; color: var(--ink); transition: border-color .15s, transform .15s; }
.tool-card:hover { border-color: var(--brand); transform: translateY(-2px); }
.tool-icon { flex: none; width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; background: var(--brand-soft); color: var(--brand); font-family: var(--font-num); font-weight: 600; font-size: 1rem; }
.tool-card h3 { font-size: 1.02rem; }
.tool-card p { margin: 4px 0 0; color: var(--muted); font-size: .92rem; }
.badge { display: inline-block; margin-left: 6px; font-size: .7rem; font-weight: 800; padding: 2px 7px; border-radius: 99px; background: var(--saffron-soft); color: var(--warn); vertical-align: middle; letter-spacing: .02em; }
.why { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 40px; }
.why div { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px; }
.why p { margin: 6px 0 0; color: var(--muted); font-size: .95rem; }

/* Tool page */
.crumbs { font-size: .88rem; color: var(--muted); padding-top: 26px; }
.crumbs a { color: var(--muted); }
.page-head { padding: 10px 0 4px; }
.page-head .intro { color: var(--muted); font-size: 1.08rem; margin: 10px 0 0; max-width: 46em; }
.updated { display: inline-block; margin-top: 12px; font-size: .85rem; font-weight: 700; color: var(--brand); background: var(--brand-soft); padding: 4px 10px; border-radius: 99px; }
.tool { display: grid; grid-template-columns: 1.1fr .9fr; gap: 0; margin-top: 22px; background: var(--card); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); overflow: hidden; }
.tool.wide { grid-template-columns: 1fr; }
.inputs { padding: clamp(18px, 3vw, 28px); display: grid; gap: 14px; align-content: start; }
.inputs h2, .results h2 { font-size: 1rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.field { display: grid; gap: 6px; }
.field label { font-weight: 700; font-size: .93rem; }
.field .hint { font-size: .83rem; color: var(--muted); }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.combo { display: grid; grid-template-columns: 1fr auto; gap: 8px; }
input[type="number"], input[type="date"], input[type="text"], select {
  width: 100%; font: inherit; font-size: 1rem; color: var(--ink); background: var(--paper); border: 1.5px solid var(--line); border-radius: 12px; padding: 11px 12px; min-height: 46px;
}
input[type="number"] { font-family: var(--font-num); }
input:focus, select:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 4px var(--brand-soft); }
fieldset { border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px 14px; margin: 0; display: grid; gap: 12px; }
legend { font-weight: 800; font-size: .9rem; padding: 0 6px; color: var(--brand); }
.results { background: var(--saffron-soft); padding: clamp(18px, 3vw, 28px); display: grid; gap: 10px; align-content: start; border-left: 1px dashed var(--line); }
.tool.wide .results { border-left: 0; border-top: 1px dashed var(--line); }
.result-main { background: var(--card); border-radius: 14px; padding: 16px; }
.result-main .label { font-size: .88rem; font-weight: 700; color: var(--muted); }
.result-main .result-value { font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.2rem); font-weight: 600; color: var(--brand); line-height: 1.2; word-break: break-word; }
.result-list { display: grid; gap: 0; background: var(--card); border-radius: 14px; padding: 4px 16px; }
.result-list div { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px dashed var(--line); font-size: .95rem; }
.result-list div:last-child { border-bottom: 0; }
.result-list dt { color: var(--muted); }
.result-list dd { margin: 0; font-weight: 600; text-align: right; font-family: var(--font-num); }
.note { font-size: .92rem; padding: 10px 12px; border-radius: 12px; background: var(--card); color: var(--muted); margin: 0; }
.note.ok { color: var(--ok); font-weight: 700; }
.note.warn { color: var(--warn); font-weight: 700; }
.btn { display: inline-flex; align-items: center; gap: 6px; font: inherit; font-weight: 700; font-size: .93rem; padding: 10px 16px; border-radius: 12px; cursor: pointer; border: 1.5px solid var(--line); background: var(--card); color: var(--ink); min-height: 44px; }
.btn:hover { border-color: var(--brand); }
.icon-btn { border: 0; background: none; color: var(--muted); cursor: pointer; font-size: 1.2rem; padding: 6px 10px; border-radius: 8px; }
.icon-btn:hover { background: var(--paper); color: var(--warn); }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; background: var(--card); }
table { border-collapse: collapse; width: 100%; font-size: .93rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { background: var(--brand-soft); font-weight: 700; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
td.n, th.n { text-align: right; white-space: nowrap; }
tr.active td { background: var(--saffron-soft); font-weight: 700; }
.gpa-table td { padding: 6px 8px; }
.gpa-table input, .gpa-table select { min-height: 40px; padding: 8px 10px; }
.g-n { color: var(--muted); font-family: var(--font-num); width: 2em; }
.prose { margin-top: 36px; }
.prose h2 { margin: 30px 0 10px; }
.prose p, .prose li { max-width: 68ch; }
.prose ul, .prose ol { padding-left: 1.2em; }
.formula { font-family: var(--font-num); background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--saffron); border-radius: 10px; padding: 12px 14px; overflow-x: auto; font-size: .93rem; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 4px 16px; margin: 10px 0; }
.faq summary { cursor: pointer; font-weight: 700; padding: 10px 0; }
.faq details p { margin: 0 0 12px; color: var(--muted); }
.ad-slot { margin: 28px 0; min-height: 90px; text-align: center; }
.ad-slot:empty { display: none; }
.related { margin-top: 40px; }
.related ul { list-style: none; padding: 0; margin: 12px 0 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; }
.related a { display: block; padding: 12px 14px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; text-decoration: none; color: var(--ink); font-weight: 700; font-size: .95rem; }
.related a:hover { border-color: var(--brand); }
.page-box { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: clamp(20px, 4vw, 36px); margin-top: 22px; }
.page-box h2 { margin: 24px 0 8px; font-size: 1.25rem; }
.page-box p, .page-box li { max-width: 68ch; }
@media (max-width: 860px) {
  .tool { grid-template-columns: 1fr; }
  .results { border-left: 0; border-top: 1px dashed var(--line); }
  .why { grid-template-columns: 1fr; }
  .site-footer .cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .row2 { grid-template-columns: 1fr; }
  .site-footer .cols { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }