/* The Stat Man - statman.uk
   Palette from the book cover: pitch greens, amber, chalk white. */

:root {
  --pitch-deep: #071d14;
  --pitch: #0A2F1D;
  --pitch-soft: #123d28;
  --night: #111719;
  --amber: #F2B824;
  --chalk: #EDF2EF;
  --muted: #C8D2CC;
  --line: rgba(242, 184, 36, 0.35);
  --sans: "Helvetica Neue", Helvetica, Arial, "Liberation Sans", sans-serif;
  --serif: Georgia, "Times New Roman", "Liberation Serif", serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "DejaVu Sans Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  font-family: var(--sans);
  background:
    radial-gradient(1200px 800px at 85% 10%, rgba(242,184,36,0.06), transparent 60%),
    linear-gradient(160deg, var(--pitch-deep) 0%, var(--pitch) 48%, var(--night) 100%);
  background-attachment: fixed;
  color: var(--chalk);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

.serif-it { font-family: var(--serif); font-style: italic; }
.gold { color: var(--amber); }

a { color: var(--amber); text-underline-offset: 3px; }
a:focus-visible { outline: 3px solid var(--amber); outline-offset: 3px; border-radius: 2px; }

.skip {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--amber); color: var(--pitch-deep); padding: 0.6rem 1rem; font-weight: 700;
}
.skip:focus { left: 0; }

/* ---------- Masthead ---------- */
.masthead {
  display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem;
  align-items: center; justify-content: space-between;
  padding: 1.1rem clamp(1.25rem, 5vw, 4rem);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.brand {
  font-weight: 700; letter-spacing: 0.32em; font-size: 0.95rem;
  display: flex; align-items: center; gap: 0.6rem; color: var(--chalk);
}
.brand-mark {
  width: 0.85rem; height: 0.85rem; border: 2px solid var(--amber); display: inline-block;
  position: relative;
}
.brand-mark::after {
  content: ""; position: absolute; right: 1px; top: 1px;
  width: 4px; height: 4px; border-radius: 50%; background: var(--amber);
}
.masthead nav { display: flex; flex-wrap: wrap; gap: 0.4rem 1.4rem; align-items: center; }
.masthead nav a {
  color: var(--muted); text-decoration: none; font-size: 0.86rem;
  letter-spacing: 0.14em; text-transform: uppercase; padding: 0.5rem 0.15rem;
}
.masthead nav a:hover { color: var(--chalk); }
.nav-cta {
  color: var(--amber) !important; border: 1px solid var(--line);
  padding: 0.5rem 1rem !important; border-radius: 2px;
}
.nav-cta:hover { background: rgba(242,184,36,0.1); }

/* ---------- Hero ---------- */
.hero {
  display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(2rem, 5vw, 5rem); align-items: center;
  padding: clamp(3rem, 7vw, 6.5rem) clamp(1.25rem, 5vw, 4rem) clamp(2rem, 4vw, 4rem);
  max-width: 78rem; margin: 0 auto; position: relative;
}
.kicker {
  color: var(--amber); font-size: 0.8rem; letter-spacing: 0.28em;
  text-transform: uppercase; margin-bottom: 1.4rem;
  padding-bottom: 0.9rem; border-bottom: 2px solid var(--line);
  display: inline-block;
}
.hero h1 {
  font-size: clamp(2.1rem, 4.6vw, 3.6rem); line-height: 1.08;
  letter-spacing: -0.01em; margin-bottom: 1.2rem; font-weight: 700;
}
.hero-sub { font-size: clamp(1.15rem, 2vw, 1.45rem); color: var(--amber); margin-bottom: 1.4rem; }
.hero-body { color: var(--muted); max-width: 34rem; margin-bottom: 2rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 1.4rem; }
.btn {
  display: inline-block; text-decoration: none; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase; font-size: 0.9rem;
  padding: 0.95rem 1.8rem; border-radius: 2px; min-height: 44px;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.btn-solid { background: var(--amber); color: var(--pitch-deep); }
.btn-solid:hover { background: #ffcc4d; }
.btn-ghost { border: 1px solid rgba(255,255,255,0.35); color: var(--chalk); }
.btn-ghost:hover { border-color: var(--amber); color: var(--amber); }
.hero-note { font-size: 0.8rem; color: var(--muted); letter-spacing: 0.05em; }

.hero-cover img {
  width: min(340px, 100%); margin: 0 auto;
  box-shadow: 0 30px 60px rgba(0,0,0,0.55), 0 0 0 1px rgba(242,184,36,0.25);
  border-radius: 3px;
}

.hero-data {
  position: absolute; bottom: 0.6rem; left: 0; right: 0;
  display: flex; justify-content: center; gap: clamp(1rem, 4vw, 3rem);
  font-family: var(--mono); font-size: 0.75rem; color: rgba(200,210,204,0.4);
  flex-wrap: wrap; padding: 0 1rem;
}

/* ---------- Bands ---------- */
.band {
  max-width: 66rem; margin: 0 auto;
  padding: clamp(3rem, 6vw, 5.5rem) clamp(1.25rem, 5vw, 4rem);
  border-top: 1px solid rgba(255,255,255,0.08);
  position: relative;
}
.index-num {
  font-family: var(--mono); color: var(--amber); opacity: 0.6;
  font-size: 0.85rem; letter-spacing: 0.3em; margin-bottom: 0.8rem;
}
.band h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.4rem); line-height: 1.15;
  margin-bottom: 1.8rem; letter-spacing: -0.005em; max-width: 40rem;
}
.cols { columns: 1; max-width: 44rem; }
.cols p { margin-bottom: 1.1rem; color: var(--muted); }
.cols p em { color: var(--chalk); }

.pull {
  margin: 2.5rem 0 0; padding: 1.4rem 0 0.2rem; max-width: 40rem;
  border-top: 2px solid var(--line);
}
.pull p { font-size: clamp(1.3rem, 2.6vw, 1.8rem); color: var(--amber); line-height: 1.3; }

/* ---------- Pillars ---------- */
.pillars {
  list-style: none; display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1.6rem 2.2rem; margin: 0 0 2.6rem;
}
.pillars li { border-left: 3px solid var(--amber); padding-left: 1.1rem; }
.pillars h3 {
  text-transform: uppercase; letter-spacing: 0.16em; font-size: 0.92rem;
  color: var(--amber); margin-bottom: 0.5rem;
}
.pillars p { color: var(--muted); font-size: 0.98rem; }

.numbers {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  gap: 1.2rem; margin-bottom: 2.4rem; max-width: 46rem;
}
.numbers div { border-top: 1px solid rgba(255,255,255,0.14); padding-top: 0.9rem; }
.numbers dt { font-family: var(--mono); font-size: 2rem; color: var(--chalk); font-weight: 700; }
.numbers dd { color: var(--muted); font-size: 0.85rem; letter-spacing: 0.08em; text-transform: uppercase; }

.workings-note { max-width: 44rem; color: var(--muted); font-size: 0.95rem; }

/* ---------- Author ---------- */
.author-grid {
  display: grid; grid-template-columns: minmax(9rem, 13rem) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem); align-items: start; max-width: 52rem;
}
.author-photo {
  border-radius: 50%; aspect-ratio: 1; object-fit: cover;
  border: 3px solid var(--amber);
}
.author-grid p { color: var(--muted); margin-bottom: 1rem; }
.author-links a {
  text-decoration: none; letter-spacing: 0.14em; text-transform: uppercase;
  font-size: 0.85rem; font-weight: 700;
}
.author-links a:hover { text-decoration: underline; }

/* ---------- Buy ---------- */
.buy-sub { color: var(--amber); font-size: 1.2rem; margin: -0.8rem 0 2rem; }
.buy-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1.4rem; max-width: 44rem; }
.buy-cards-3 { max-width: 60rem; grid-template-columns: repeat(auto-fit, minmax(13.5rem, 1fr)); }
.buy-isbn { font-family: var(--mono); font-size: 0.76rem; color: rgba(200,210,204,0.6); letter-spacing: 0.02em; }
.buy-card {
  border: 1px solid var(--line); border-radius: 3px; padding: 1.5rem 1.6rem;
  text-decoration: none; display: flex; flex-direction: column; gap: 0.45rem;
  background: rgba(6, 22, 17, 0.55);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}
.buy-card:hover { border-color: var(--amber); background: rgba(242,184,36,0.07); }
.buy-format { color: var(--chalk); font-weight: 700; font-size: 1.25rem; letter-spacing: 0.04em; }
.buy-detail { color: var(--muted); font-size: 0.9rem; }
.buy-go {
  color: var(--amber); font-size: 0.85rem; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase; margin-top: 0.7rem;
}

/* ---------- Share ---------- */
.share { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid rgba(255,255,255,0.12); max-width: 60rem; }
.share-h { font-size: 1.15rem; letter-spacing: 0.01em; margin-bottom: 0.25rem; }
.share-sub { font-family: var(--serif); font-style: italic; color: var(--amber); margin-bottom: 1.3rem; }
.share-list { list-style: none; display: flex; flex-wrap: wrap; gap: 0.7rem; padding: 0; }
.share-btn {
  display: inline-flex; align-items: center; gap: 0.55rem;
  min-height: 44px; padding: 0.6rem 1rem;
  border: 1px solid rgba(255,255,255,0.2); border-radius: 2px;
  background: rgba(6,22,17,0.5); color: var(--chalk);
  font: inherit; font-size: 0.86rem; letter-spacing: 0.04em;
  text-decoration: none; cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}
.share-btn svg { width: 18px; height: 18px; fill: currentColor; flex: none; }
.share-btn:hover { border-color: var(--amber); color: var(--amber); background: rgba(242,184,36,0.08); }
.share-btn:focus-visible { outline: 3px solid var(--amber); outline-offset: 3px; }
.share-btn.copied { border-color: var(--amber); color: var(--amber); }

/* ---------- Footer ---------- */
.site-foot {
  border-top: 1px solid rgba(255,255,255,0.1); margin-top: 2rem;
  padding: 2.6rem clamp(1.25rem, 5vw, 4rem) 2.2rem;
  background: rgba(4, 12, 9, 0.6);
}
.rg {
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 1.4rem;
  max-width: 60rem; margin: 0 auto 2rem; align-items: start;
}
.rg-badge {
  border: 3px solid var(--chalk); border-radius: 50%;
  width: 3.4rem; height: 3.4rem; display: grid; place-items: center;
  font-weight: 700; font-size: 1.05rem;
}
.rg p { color: var(--muted); font-size: 0.92rem; margin-bottom: 0.55rem; }
.rg strong { color: var(--chalk); }
.foot-meta {
  max-width: 60rem; margin: 0 auto; display: flex; flex-wrap: wrap;
  justify-content: space-between; gap: 0.5rem 2rem;
  border-top: 1px solid rgba(255,255,255,0.08); padding-top: 1.4rem;
}
.foot-meta p { color: rgba(200,210,204,0.55); font-size: 0.82rem; letter-spacing: 0.05em; }

/* ---------- Reveal (progressive, JS adds .in) ---------- */
.band, .hero-copy, .hero-cover { opacity: 1; }
@media (prefers-reduced-motion: no-preference) {
  .js .reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
  .js .reveal.in { opacity: 1; transform: none; }
}

/* ---------- Mobile ---------- */
@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; padding-bottom: 4rem; }
  .hero-cover { order: -1; }
  .hero-cover img { width: min(230px, 70%); }
  .author-grid { grid-template-columns: 1fr; }
  .author-photo { width: 9rem; }
  .masthead nav { font-size: 0.8rem; }
}

/* ==========================================================================
   Sub-pages: heads, breadcrumbs, FAQ, glossary, chapters, how-to steps
   ========================================================================== */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.masthead .brand a { color: inherit; text-decoration: none; display: flex; align-items: center; gap: 0.6rem; }
.masthead nav a[aria-current="page"] { color: var(--amber); }

.page-head { padding-bottom: 1rem; border-top: 0; }
.page-head h1 { font-size: clamp(1.9rem, 4vw, 3rem); line-height: 1.1; margin: 0.6rem 0 1rem; }
.lede { font-size: 1.12rem; color: var(--muted); max-width: 46rem; }

.crumbs { font-size: 0.82rem; letter-spacing: 0.1em; text-transform: uppercase; color: rgba(200,210,204,0.6); }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--amber); }
.crumbs span[aria-hidden] { padding: 0 0.35rem; }

.inline-cta { font-weight: 700; letter-spacing: 0.04em; text-decoration: none; }
.inline-cta:hover { text-decoration: underline; }

.cta-band { border-top: 1px solid rgba(255,255,255,0.12); }
.cta-band p { color: var(--muted); max-width: 46rem; margin-bottom: 1.2rem; }
.cta-band .btn { margin-right: 0.6rem; }

.foot-nav { max-width: 60rem; margin: 0 auto 1.4rem; display: flex; flex-wrap: wrap; gap: 0.4rem 1.6rem; }
.foot-nav a { color: var(--muted); font-size: 0.86rem; text-decoration: none; }
.foot-nav a:hover { color: var(--amber); }

/* Key facts */
.keyfacts { display: grid; gap: 0; max-width: 60rem; }
.keyfacts div {
  display: grid; grid-template-columns: minmax(6rem, 10rem) minmax(0, 1fr);
  gap: 0.5rem 1.5rem; padding: 0.75rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.09);
}
.keyfacts dt { font-family: var(--mono); font-size: 0.76rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--amber); padding-top: 0.15rem; }
.keyfacts dd { margin: 0; color: var(--chalk); }

/* FAQ */
.faq { max-width: 48rem; }
.faq-item { padding: 1.1rem 0; border-bottom: 1px solid rgba(255,255,255,0.09); }
.faq-q { font-size: 1.05rem; margin-bottom: 0.5rem; color: var(--chalk); }
.faq-a { color: var(--muted); }

/* Inside the book */
.part { max-width: 66rem; margin: 0 auto; padding: 2.2rem clamp(1.25rem, 5vw, 4rem);
  border-top: 1px solid rgba(255,255,255,0.08); }
.part-kicker { font-family: var(--mono); color: var(--amber); font-size: 0.78rem;
  letter-spacing: 0.28em; text-transform: uppercase; margin-bottom: 0.4rem; }
.part h2 { font-size: clamp(1.4rem, 2.6vw, 2rem); margin-bottom: 1.4rem; }
.chapter-list { list-style: none; padding: 0; display: grid; gap: 1.1rem; }
.chapter-list li { border-left: 2px solid rgba(242,184,36,0.35); padding-left: 1rem; }
.chapter-list h3 { font-size: 1rem; margin-bottom: 0.3rem; color: var(--chalk); }
.chapter-list p { color: var(--muted); font-size: 0.95rem; }
.ch-num { font-family: var(--mono); color: var(--amber); margin-right: 0.5rem; }
.appendix-list li { border-left-color: rgba(255,255,255,0.25); }

/* Glossary */
.term-index { display: flex; flex-wrap: wrap; gap: 0.3rem 0.9rem; margin-top: 1.6rem;
  padding-top: 1.2rem; border-top: 1px solid rgba(255,255,255,0.1); }
.term-index a { color: var(--muted); font-size: 0.84rem; text-decoration: none; }
.term-index a:hover { color: var(--amber); text-decoration: underline; }
.terms { display: grid; gap: 1.4rem; max-width: 52rem; }
.term { scroll-margin-top: 5rem; }
.term h3 { font-size: 1.02rem; margin-bottom: 0.35rem; }
.term dfn { font-style: normal; color: var(--amber); }
.term p { color: var(--muted); }

/* How-to steps */
.howto { max-width: 50rem; margin-bottom: 3rem; scroll-margin-top: 5rem; }
.howto h2 { font-size: clamp(1.3rem, 2.4vw, 1.8rem); margin-bottom: 0.5rem; }
.steps { counter-reset: step; list-style: none; padding: 0; display: grid; gap: 1.2rem; margin-top: 1.4rem; }
.steps li { counter-increment: step; position: relative; padding-left: 3rem; }
.steps li::before {
  content: counter(step); position: absolute; left: 0; top: 0;
  width: 2rem; height: 2rem; display: grid; place-items: center;
  border: 1px solid var(--line); border-radius: 50%;
  font-family: var(--mono); font-size: 0.85rem; color: var(--amber);
}
.steps h3 { font-size: 1rem; margin-bottom: 0.3rem; }
.steps p { color: var(--muted); }

/* Free chapter */
.chapter-body { max-width: 40rem; margin: 0 auto; font-size: 1.06rem; }
.chapter-body p { margin-bottom: 1.15rem; color: var(--chalk); }
.chapter-body h2 { font-size: 1.25rem; margin: 2.2rem 0 0.9rem; color: var(--amber); }
.chapter-body .thesis { border-top: 2px solid var(--line); border-bottom: 2px solid var(--line);
  padding: 1rem 0; margin: 1.8rem 0; font-style: italic; }
.chapter-box { border-left: 3px solid var(--amber); padding: 0.9rem 0 0.9rem 1.2rem; margin: 1.8rem 0; }
.chapter-box .box-label { font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--amber); margin-bottom: 0.5rem; }
.chapter-box p { color: var(--muted); }

@media (max-width: 640px) {
  .keyfacts div { grid-template-columns: 1fr; gap: 0.15rem; }
  .steps li { padding-left: 2.6rem; }
}