/* The Math of Money — site styles
   Palette taken from the book cover: ink navy, amber, cool paper. */
/* Self-hosted fonts (SIL Open Font License; see /assets/fonts) */
@font-face { font-family: 'Archivo'; font-style: normal; font-display: swap; font-weight: 100 900; font-stretch: 62% 125%; src: url(/assets/fonts/archivo-latin-wdth-normal.woff2) format('woff2'); }
@font-face { font-family: 'Literata'; font-style: normal; font-display: swap; font-weight: 200 900; src: url(/assets/fonts/literata-latin-opsz-normal.woff2) format('woff2'); }
@font-face { font-family: 'Literata'; font-style: italic; font-display: swap; font-weight: 200 900; src: url(/assets/fonts/literata-latin-opsz-italic.woff2) format('woff2'); }
:root {
  --ink: #0e1e34;
  --ink-2: #16294a;
  --grid: #152a4a;
  --amber: #f6b73c;
  --amber-deep: #8a5a00;
  --paper: #f4f6f9;
  --white: #ffffff;
  --rule: #d9dfe7;
  --slate: #4b5c72;
  --text: #15202e;
  --cost: #b4442f;
  --gain: #23735a;
  --display: 'Archivo', system-ui, sans-serif;
  --body: 'Literata', Georgia, serif;
  --measure: 66ch;
  --radius: 6px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; animation: none !important; } }
body { margin: 0; background: var(--paper); color: var(--text); font-family: var(--body); font-size: 1.0625rem; line-height: 1.6; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
:focus-visible { outline: 3px solid var(--amber); outline-offset: 2px; border-radius: 2px; }
.wrap { width: min(1120px, 100% - 32px); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--amber); color: var(--ink); padding: 8px 12px; font-family: var(--display); z-index: 10; }
.skip:focus { left: 16px; }

/* Type scale (1.25) */
h1, h2, h3, .num { font-family: var(--display); font-stretch: 108%; letter-spacing: -0.01em; line-height: 1.1; margin: 0; }
h1 { font-size: clamp(2.4rem, 5vw, 4.1rem); font-weight: 800; }
h2 { font-size: clamp(1.75rem, 3.4vw, 2.5rem); font-weight: 800; }
h3 { font-size: 1.25rem; font-weight: 700; }
p { margin: 0 0 1em; max-width: var(--measure); }
.lede { font-size: 1.2rem; }
.num { font-variant-numeric: tabular-nums lining-nums; }

/* Header */
.site-head { background: var(--ink); color: var(--white); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; flex-wrap: wrap; }
.brand { font-family: var(--display); font-weight: 800; font-stretch: 108%; font-size: 1.15rem; text-decoration: none; }
.nav { display: flex; gap: 20px; flex-wrap: wrap; font-family: var(--display); font-size: 0.95rem; }
.nav a { text-decoration: none; opacity: 0.85; padding: 6px 0; }
.nav a:hover, .nav a[aria-current="page"] { opacity: 1; text-decoration: underline; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-family: var(--display); font-weight: 700; font-size: 1rem; padding: 14px 22px; border-radius: var(--radius); border: 2px solid transparent; text-decoration: none; cursor: pointer; }
.btn-amber { background: var(--amber); color: var(--ink); }
.btn-amber:hover { background: #ffc85a; }
.btn-line { border-color: currentColor; background: transparent; color: inherit; }
.btn-line:hover { background: rgba(255,255,255,0.08); }

/* Hero */
.hero { background: var(--ink); color: var(--white); background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px); background-size: 48px 48px; padding: 44px 0 64px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr); gap: 56px; align-items: center; }
.hero h1 { max-width: 15ch; }
.hero .lede { color: #c9d4e2; margin-top: 20px; max-width: 46ch; }
.hero-cover img { width: 100%; max-width: 320px; margin-left: auto; box-shadow: 0 0 0 1px #34507a, 0 24px 60px rgba(0,0,0,0.5); border-radius: 3px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.hero-note { font-size: 0.9rem; color: #9fb0c6; margin-top: 12px; }

/* The sentence calculator: the one bold moment */
.sentence { margin-top: 28px; padding: 20px 0 0; border-top: 1px solid #2c4468; }
.sentence p { font-family: var(--display); font-size: clamp(1.15rem, 2.2vw, 1.5rem); line-height: 1.7; max-width: none; margin: 0; }
.sentence label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.sentence input { font: inherit; font-weight: 800; color: var(--amber); background: transparent; border: 0; border-bottom: 2px dashed #5b7397; width: 6.2ch; text-align: center; padding: 0 2px; font-variant-numeric: tabular-nums; }
.sentence input.short { width: 3.2ch; }
.sentence input:focus { outline: none; border-bottom-color: var(--amber); }
.answer { display: grid; grid-template-columns: repeat(3, auto); justify-content: start; gap: 8px 40px; margin-top: 20px; }
.answer div { font-family: var(--display); }
.answer .k { font-size: 0.9rem; color: #9fb0c6; }
.answer .v { font-size: clamp(1.6rem, 3.6vw, 2.6rem); font-weight: 800; font-stretch: 108%; font-variant-numeric: tabular-nums; }
.answer .v.hot { color: var(--amber); }

/* Sections */
section { padding: 80px 0; }
.section-head { max-width: 60ch; margin-bottom: 40px; }
.section-head p { color: var(--slate); margin-top: 12px; }
.band { background: var(--white); border-block: 1px solid var(--rule); }

/* Contents */
.parts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px 48px; }
.part h3 { display: flex; gap: 10px; align-items: baseline; padding-bottom: 10px; border-bottom: 2px solid var(--ink); margin-bottom: 12px; }
.part h3 span { color: var(--amber-deep); font-variant-numeric: tabular-nums; }
.part ol { margin: 0; padding: 0; list-style: none; }
.part li { padding: 8px 0; border-bottom: 1px solid var(--rule); font-size: 0.98rem; display: grid; grid-template-columns: 2.2em 1fr; }
.part li b { font-family: var(--display); font-weight: 700; color: var(--slate); font-variant-numeric: tabular-nums; }

/* Method steps (a real sequence) */
.steps { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 0; counter-reset: s; border-top: 2px solid var(--ink); }
.steps li { list-style: none; padding: 16px 14px 0 0; counter-increment: s; }
.steps li::before { content: counter(s); display: block; font-family: var(--display); font-weight: 800; font-size: 1.6rem; color: var(--amber-deep); margin-bottom: 6px; }
.steps b { font-family: var(--display); display: block; margin-bottom: 4px; }
.steps span { font-size: 0.92rem; color: var(--slate); }
.steps-wrap { padding: 0; margin: 0; }

/* Excerpt */
.excerpt { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; align-items: start; }
.excerpt blockquote { margin: 0; font-size: 1.1rem; }
.excerpt blockquote p { max-width: 54ch; }
.excerpt figure { margin: 0; background: var(--white); border: 1px solid var(--rule); padding: 16px; border-radius: var(--radius); }
.excerpt figcaption { font-size: 0.85rem; color: var(--slate); margin-top: 10px; }
.chapter-tag { font-family: var(--display); font-weight: 700; color: var(--slate); margin-bottom: 12px; display: block; }

/* Toolkit teaser list */
.tool-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 32px; margin: 0; padding: 0; list-style: none; }
.tool-list a { display: grid; grid-template-columns: 2.4em 1fr; padding: 12px 0; border-bottom: 1px solid var(--rule); text-decoration: none; }
.tool-list a:hover span { text-decoration: underline; }
.tool-list b { font-family: var(--display); color: var(--slate); font-variant-numeric: tabular-nums; }

/* Signup */
.signup { background: var(--ink); color: var(--white); }
.signup-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; align-items: center; }
.signup p { color: #c9d4e2; }
.signup ul { padding-left: 1.1em; color: #c9d4e2; margin: 0 0 1em; }
.form { display: grid; gap: 12px; }
.form label { font-family: var(--display); font-weight: 700; }
.form-row { display: flex; gap: 10px; flex-wrap: wrap; }
.form input[type=email], .form input[type=text] { flex: 1 1 240px; font: inherit; padding: 13px 14px; border-radius: var(--radius); border: 2px solid #3a5378; background: var(--ink-2); color: var(--white); }
.form input::placeholder { color: #8396b0; }
.form .fine { font-size: 0.85rem; color: #9fb0c6; }
.form-status { min-height: 1.5em; font-family: var(--display); }
.form-status.ok { color: #9ee0c3; }
.form-status.err { color: #ffb4a3; }
.downloads { display: none; gap: 10px; flex-wrap: wrap; }
.downloads.show { display: flex; }
.hp { position: absolute; left: -9999px; }

/* About */
.about { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); gap: 56px; }
.facts { display: grid; gap: 24px; align-content: start; }
.fact .num { font-size: 2.4rem; font-weight: 800; }
.fact span { color: var(--slate); display: block; }

/* Footer */
.site-foot { background: var(--ink); color: #9fb0c6; padding: 40px 0; font-size: 0.92rem; }
.site-foot .wrap { display: grid; gap: 12px; }
.site-foot nav { display: flex; gap: 20px; flex-wrap: wrap; font-family: var(--display); }
.site-foot p { max-width: 90ch; }

/* Toolkit page */
.tk-hero { background: var(--ink); color: var(--white); padding: 48px 0 40px; }
.tk-hero p { color: #c9d4e2; margin-top: 14px; }
.tk { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 48px; padding: 48px 0 80px; }
.tk-nav { position: sticky; top: 16px; align-self: start; max-height: calc(100vh - 32px); overflow: auto; font-family: var(--display); font-size: 0.92rem; }
.tk-nav h2 { font-size: 0.95rem; margin: 18px 0 6px; color: var(--slate); font-stretch: 100%; }
.tk-nav ol { list-style: none; margin: 0; padding: 0; }
.tk-nav a { display: grid; grid-template-columns: 2em 1fr; padding: 5px 0; text-decoration: none; }
.tk-nav a:hover span { text-decoration: underline; }
.tk-nav b { color: var(--slate); font-variant-numeric: tabular-nums; }
.tk-nav select { display: none; }
.calc { background: var(--white); border: 1px solid var(--rule); border-radius: var(--radius); padding: 28px; margin-bottom: 28px; scroll-margin-top: 16px; }
.calc header { margin-bottom: 18px; }
.calc .ch { font-family: var(--display); font-weight: 700; color: var(--amber-deep); font-size: 0.95rem; }
.calc h2 { font-size: 1.6rem; margin: 4px 0 8px; }
.calc header p { color: var(--slate); margin: 0; }
.calc-body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 28px; }
.fields { display: grid; gap: 12px; align-content: start; }
.field { display: grid; gap: 4px; }
.field label { font-family: var(--display); font-size: 0.9rem; font-weight: 600; }
.field .box { display: flex; align-items: center; border: 1.5px solid #b9c3d0; border-radius: var(--radius); background: var(--paper); }
.field .box:focus-within { border-color: var(--ink); outline: 3px solid var(--amber); outline-offset: 1px; }
.field .box span { padding: 0 10px; color: var(--slate); font-family: var(--display); }
.field input { font: inherit; font-family: var(--display); font-variant-numeric: tabular-nums; border: 0; background: transparent; padding: 10px 10px; width: 100%; min-width: 0; }
.field input:focus { outline: none; }
.results { border-left: 3px solid var(--ink); padding-left: 22px; }
.big { display: grid; gap: 14px; margin-bottom: 16px; }
.big .k { font-family: var(--display); font-size: 0.9rem; color: var(--slate); }
.big .v { font-family: var(--display); font-weight: 800; font-stretch: 108%; font-size: 1.9rem; line-height: 1.15; font-variant-numeric: tabular-nums; }
.v.cost { color: var(--cost); }
.v.gain { color: var(--gain); }
.rows { width: 100%; border-collapse: collapse; font-size: 0.95rem; margin-bottom: 12px; }
.rows th, .rows td { text-align: left; padding: 7px 8px 7px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.rows td:last-child, .rows th:last-child { text-align: right; font-family: var(--display); font-variant-numeric: tabular-nums; white-space: nowrap; padding-right: 0; }
.rows thead th { font-family: var(--display); font-size: 0.85rem; color: var(--slate); }
.rows.grid td, .rows.grid th { text-align: right; font-family: var(--display); }
.rows.grid td:first-child, .rows.grid th:first-child { text-align: left; }
.note { font-size: 0.88rem; color: var(--slate); margin: 0; }
.tk-foot { font-size: 0.9rem; color: var(--slate); }

/* Plain pages */
.page { padding: 56px 0 80px; }
.page h1 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: 24px; }
.page h2 { font-size: 1.4rem; margin: 32px 0 10px; }

/* Responsive */
@media (max-width: 960px) {
  .hero-grid, .excerpt, .signup-grid, .about { grid-template-columns: 1fr; gap: 36px; }
  .hero-cover img { margin: 0; max-width: 220px; }
  .parts, .tool-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 24px; }
  .tk { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .tk-nav { position: static; max-height: none; }
  .tk-nav h2, .tk-nav ol { display: none; }
  .tk-nav select { display: block; width: 100%; font: inherit; padding: 12px; border: 1.5px solid #b9c3d0; border-radius: var(--radius); background: var(--white); }
}
@media (max-width: 640px) {
  section { padding: 56px 0; }
  .parts, .tool-list { grid-template-columns: 1fr; }
  .answer { grid-template-columns: 1fr 1fr; gap: 8px 24px; }
  .calc { padding: 20px; }
  .calc-body { grid-template-columns: 1fr; }
  .results { border-left: 0; border-top: 3px solid var(--ink); padding: 18px 0 0; }
  .nav { gap: 14px; }
  .nav .wide { display: none; }
  .rows td:last-child { white-space: normal; }
  .site-head .wrap { min-height: 56px; }
}
.excerpt h2, .signup h2, .about h2 { margin-bottom: 16px; }
.rows.grid td:first-child { white-space: nowrap; }