/* By the Numbers Health. Design tokens per the 10/26 design spec (navy/cream report-card system). */
:root {
  --navy-950: #0b1528; --navy-900: #14243e; --navy-800: #1d3356; --navy-700: #29456f;
  --cream-50: #fbf8ef; --cream-100: #f6f2e9; --cream-200: #ece4d4;
  --ink: #172033; --muted: #4c5870; --on-dark: #fff9ed; --muted-dark: #cfd8e8;
  --red: #d7352a; --link: #2f5fc4; --focus: #ffcc4d;
  --g-sup: #22743e; --g-pla: #b88000; --g-noe: #6d7480; --g-unl: #5c5c5c; --g-pos: #b3601a; --g-har: #ba2121;
  --serif: Georgia, Cambria, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --r-card: 1.1rem; --r-panel: 1.6rem;
  --sh-card: 0 12px 36px rgba(11,21,40,.10); --sh-lift: 0 8px 20px rgba(11,21,40,.12);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; animation: none !important; } }
body { margin: 0; background: var(--cream-50); color: var(--ink); font: 1.1875rem/1.6 var(--sans); }   /* 19px: federal health-literacy guidance for older readers */
img { max-width: 100%; height: auto; display: block; }
a { color: var(--link); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; border-radius: 4px; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 1.1rem; }
.narrow { max-width: 720px; }
.eyebrow { font: 700 .8rem/1.2 var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin: 0 0 .7rem; }
.dark .eyebrow { color: var(--muted-dark); }
h1, h2, h3 { font-family: var(--serif); color: var(--navy-900); margin: 0 0 .9rem; }
h1 { font-size: 2.6rem; line-height: 1.02; }
h2 { font-size: 2rem; line-height: 1.1; }
h3 { font-size: 1.35rem; line-height: 1.2; }
.lead { font-size: 1.2rem; line-height: 1.55; color: var(--muted); max-width: 680px; }
.dark { background: var(--navy-900); color: var(--on-dark); }
.dark h1, .dark h2, .dark h3 { color: var(--on-dark); }
.dark .lead, .dark p.muted { color: var(--muted-dark); }
.ast { color: var(--red); font-weight: 700; }
section.block { padding: 3.5rem 0; }
p.muted, .note { color: var(--muted); font-size: .97rem; }

/* header */
header.site { background: var(--cream-50); border-bottom: 1px solid rgba(20,36,62,.12); }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; gap: .8rem; min-height: 64px; flex-wrap: wrap; }
.brand { font: 700 1.15rem/1.1 var(--serif); color: var(--navy-900); text-decoration: none; }
.brand b { color: var(--red); }
nav.top { display: flex; gap: 1.1rem; align-items: center; flex-wrap: wrap; }
nav.top a { color: var(--navy-900); text-decoration: none; font-size: .98rem; padding: .5rem 0; }
nav.top a:hover { text-decoration: underline; }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: .75rem 1.35rem; border-radius: 999px; font: 700 1rem/1.2 var(--sans); text-decoration: none; border: 2px solid transparent; cursor: pointer; transition: transform .15s, box-shadow .15s; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: #f2b544; color: var(--navy-950); box-shadow: var(--sh-lift); min-height: 56px; }   /* 8.5:1 contrast (UX research 10/26) */
.btn-primary:hover { background: #f7c662; }
.btn-light { background: var(--cream-100); color: var(--navy-900); }
.btn-outline { background: transparent; color: var(--navy-900); border-color: var(--navy-900); }
.dark .btn-outline { color: var(--on-dark); border-color: var(--on-dark); }
.btn-soon { background: #7d8798; color: #fff; cursor: default; box-shadow: none; }
.ctas { display: flex; flex-wrap: wrap; gap: .7rem; margin: 1.4rem 0 .8rem; }

/* hero */
.hero { padding: 2.5rem 0 3.5rem; }
.hero-grid { display: grid; gap: 2.2rem; align-items: center; }
.hero h1 { font-size: 2.7rem; }
.hero .sub { font: 1.18rem/1.45 var(--serif); color: var(--muted-dark); margin: 0 0 1rem; }
.hero .wink { font-weight: 600; color: var(--on-dark); margin: .4rem 0 0; }
.trust { font-size: .93rem; color: var(--muted-dark); margin-top: .6rem; }

/* 3D cover */
.book-3d { perspective: 1400px; display: flex; justify-content: center; }
.book-3d .cover { position: relative; width: min(74vw, 340px); transform: rotateY(-14deg) rotateX(3deg); transform-style: preserve-3d; transition: transform .35s ease; border-radius: .25rem .5rem .5rem .25rem; box-shadow: 24px 28px 60px rgba(0,0,0,.45); }
.book-3d .cover img { border-radius: .25rem .5rem .5rem .25rem; }
.book-3d .cover::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 14px; border-radius: .25rem 0 0 .25rem; background: linear-gradient(90deg, rgba(255,255,255,.18), rgba(0,0,0,.25) 60%, rgba(255,255,255,.06)); pointer-events: none; }
.book-3d .cover::after { content: ""; position: absolute; right: -12px; top: 6px; bottom: 6px; width: 12px; background: repeating-linear-gradient(180deg, #f3eee3 0 2px, #ddd4c2 2px 3px); transform: rotateY(60deg); transform-origin: left; border-radius: 0 3px 3px 0; }
.book-3d:hover .cover { transform: rotateY(-6deg) rotateX(1deg) translateY(-4px); }
@media (prefers-reduced-motion: reduce) { .book-3d .cover, .book-3d:hover .cover { transform: none; } }

/* pills */
.pill { display: inline-flex; align-items: center; gap: .35rem; font: 800 .74rem/1 var(--sans); letter-spacing: .06em; text-transform: uppercase; padding: .45rem .7rem; border-radius: 999px; color: #fff; white-space: nowrap; }
.pill::before { content: ""; width: .45rem; height: .45rem; border-radius: 50%; background: currentColor; opacity: .85; }
.pill.sup { background: var(--g-sup); } .pill.pla { background: var(--g-pla); color: #241700; } .pill.noe { background: var(--g-noe); }
.pill.unl { background: var(--g-unl); } .pill.pos { background: var(--g-pos); } .pill.har { background: var(--g-har); }
.prio { display: inline-block; font: 700 .78rem/1 var(--sans); padding: .4rem .65rem; border-radius: .4rem; border: 1.5px solid var(--navy-700); color: var(--navy-900); background: #fff; }
.prio.start { background: var(--navy-900); color: #fff; border-color: var(--navy-900); }
.prio.skip { border-style: dashed; color: var(--muted); }

/* report card */
.report { background: var(--cream-100); color: var(--ink); border-radius: var(--r-card); padding: 1.1rem 1.3rem; box-shadow: var(--sh-card); }
.report li { display: flex; justify-content: space-between; align-items: center; gap: .8rem; padding: .7rem 0; border-bottom: 1px solid var(--cream-200); }
.report li:last-child { border-bottom: 0; }
.report ul { list-style: none; margin: 0; padding: 0; }

/* stats bento */
.bento { display: grid; gap: 1rem; }
.stat { background: #fff; border: 1px solid rgba(20,36,62,.10); border-radius: var(--r-card); padding: 1.4rem; box-shadow: var(--sh-card); }
.stat .num { font: 700 2.6rem/1 var(--serif); color: var(--navy-900); margin: 0 0 .5rem; }
.stat .num small { font-size: 1.05rem; font-weight: 700; color: var(--muted); }
.stat p { margin: .3rem 0 0; }
.stat .meas { font-size: .9rem; color: var(--muted); margin-top: .6rem; border-top: 1px dashed var(--cream-200); padding-top: .6rem; }

/* scoreboard */
.board { display: grid; gap: .7rem; max-width: 860px; }
.board details { background: #fff; border: 1px solid rgba(20,36,62,.12); border-radius: 1rem; box-shadow: 0 4px 14px rgba(11,21,40,.06); }
.board details[open] { border-color: var(--navy-700); box-shadow: var(--sh-card); }
.board summary { list-style: none; cursor: pointer; padding: .95rem 1.1rem; display: grid; grid-template-columns: 1fr auto; gap: .5rem .8rem; align-items: center; min-height: 56px; }
.board summary::-webkit-details-marker { display: none; }
.board .name { font-weight: 700; font-size: 1.05rem; }
.board .tags { display: flex; gap: .4rem; flex-wrap: wrap; justify-content: flex-end; }
.board .barrow { grid-column: 1 / -1; display: flex; align-items: center; gap: .7rem; }
.board .bar { flex: 1; height: 12px; background: var(--cream-200); border-radius: 999px; overflow: hidden; }
.board .bar i { display: block; height: 100%; width: var(--w, 0%); background: var(--navy-800); border-radius: 999px; transform-origin: left; transition: transform .6s ease; }
.js .board details:not([open]) .bar i { transform: scaleX(.12); }
.board .val { font: 700 .95rem/1 var(--sans); color: var(--navy-900); min-width: 6.5rem; text-align: right; }
.board .detail { padding: 0 1.1rem 1.1rem; color: var(--ink); }
.board .detail p { margin: .2rem 0; }
.board .caution { color: #8a2b14; font-weight: 600; }
.chev { width: 22px; height: 22px; transition: transform .2s; }
details[open] .chev { transform: rotate(180deg); }

/* look inside */
.peek { display: grid; gap: 1rem; }
.peek button { all: unset; cursor: pointer; display: block; background: #fff; border-radius: var(--r-card); overflow: hidden; border: 1px solid rgba(20,36,62,.12); box-shadow: var(--sh-card); transition: transform .2s; }
.peek button:hover { transform: translateY(-3px); }
.peek button:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }
.peek .thumb { aspect-ratio: 4/3; background: #fff; display: flex; align-items: center; justify-content: center; padding: .6rem; border-bottom: 1px solid var(--cream-200); }
.peek .thumb img { max-height: 100%; object-fit: contain; }
.peek .cap { padding: 1rem 1.1rem 1.2rem; }
.peek .cap b { display: block; font: 700 1.1rem/1.2 var(--serif); color: var(--navy-900); margin-bottom: .3rem; }
dialog.zoom { border: 0; border-radius: 1rem; padding: 0; max-width: min(96vw, 1000px); width: 100%; box-shadow: 0 30px 80px rgba(0,0,0,.5); }
dialog.zoom::backdrop { background: rgba(11,21,40,.75); }
dialog.zoom img { width: 100%; }
dialog.zoom .bar { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: .8rem 1rem; background: var(--cream-100); }
dialog.zoom .bar p { margin: 0; font-size: .95rem; }

/* grade scale */
.grades { display: grid; gap: .8rem; }
.grade { background: var(--cream-100); color: var(--ink); border-radius: 1rem; padding: 1rem 1.2rem; border-left: 8px solid var(--c); }
.grade p { margin: .45rem 0 0; }

/* plan */
.plan { display: grid; gap: .8rem; counter-reset: step; }
.step { background: #fff; border-radius: 1rem; padding: 1rem 1.2rem; border: 1px solid rgba(20,36,62,.12); display: grid; grid-template-columns: auto 1fr; gap: .2rem 1rem; align-items: start; }
.step .wk { font: 700 .85rem/1.2 var(--sans); color: var(--muted); text-transform: uppercase; letter-spacing: .06em; grid-row: span 2; min-width: 6.2rem; padding-top: .2rem; }
.step b { font-family: var(--serif); font-size: 1.12rem; color: var(--navy-900); }
.step span { color: var(--muted); }

/* printable */
.printable { display: grid; gap: 1.6rem; align-items: center; }
.sheet { background: #fff; border-radius: .6rem; padding: 1.2rem 1.3rem; box-shadow: 0 18px 50px rgba(11,21,40,.18); transform: rotate(-2deg); max-width: 420px; }
.sheet h4 { font: 700 1.2rem/1.2 var(--serif); margin: 0 0 .5rem; color: var(--navy-900); }
.sheet ol { margin: 0; padding: 0; list-style: none; counter-reset: d8; }
.sheet li { counter-increment: d8; display: flex; align-items: center; gap: .6rem; padding: .38rem 0; border-bottom: 1px solid var(--cream-200); font-size: .95rem; }
.sheet li::before { content: counter(d8); font-weight: 800; color: var(--muted); width: 1rem; }
.sheet li span { flex: 1; }
.sheet .boxes { display: flex; gap: 3px; }
.sheet .boxes i { width: 12px; height: 12px; border: 1.5px solid var(--navy-900); border-radius: 2px; }
@media (prefers-reduced-motion: reduce) { .sheet { transform: none; } }

/* faq */
.faq details { border-bottom: 1px solid rgba(20,36,62,.15); }
.faq summary { cursor: pointer; padding: 1.05rem 0; font: 700 1.1rem/1.35 var(--serif); color: var(--navy-900); list-style: none; display: flex; justify-content: space-between; gap: 1rem; min-height: 48px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 400 1.6rem/1 var(--sans); color: var(--muted); }
.faq details[open] summary::after { content: "\2212"; }
.faq .ans { padding: 0 0 1.1rem; max-width: 720px; }

/* series */
.series { display: grid; gap: 1rem; }
.scard { background: #fff; border-radius: var(--r-card); padding: 1.3rem; border: 1px solid rgba(20,36,62,.12); box-shadow: var(--sh-card); display: flex; gap: 1.1rem; align-items: flex-start; }
.scard img { width: 92px; border-radius: .25rem; box-shadow: 6px 8px 18px rgba(0,0,0,.25); }
.scard .ph { width: 92px; aspect-ratio: 7/10; border-radius: .25rem; background: var(--navy-900); color: var(--on-dark); display: flex; align-items: center; justify-content: center; text-align: center; font: 700 1.6rem/1 var(--serif); flex: none; }
.scard h3 { font-size: 1.2rem; margin: .2rem 0 .3rem; }
.status { display: inline-block; font: 700 .72rem/1 var(--sans); letter-spacing: .07em; text-transform: uppercase; padding: .35rem .55rem; border-radius: .35rem; background: var(--cream-200); color: var(--navy-900); }
.status.now { background: var(--g-sup); color: #fff; }

/* author */
.author { display: grid; gap: 1.4rem; align-items: center; }
.headshot { width: 200px; height: 200px; border-radius: 50%; object-fit: cover; box-shadow: var(--sh-card); border: 4px solid var(--cream-100); }
.mono {width: 120px; height: 120px; border-radius: 50%; background: var(--navy-900); color: var(--on-dark); display: flex; align-items: center; justify-content: center; font: 700 2rem/1 var(--serif); box-shadow: var(--sh-card); }
.mono small { display: block; font-size: .8rem; color: var(--muted-dark); text-align: center; }

/* sticky mobile cta */
.sticky { position: fixed; left: 0; right: 0; bottom: 0; background: var(--navy-950); padding: .6rem 1rem calc(.6rem + env(safe-area-inset-bottom)); display: none; gap: .6rem; z-index: 20; box-shadow: 0 -8px 24px rgba(0,0,0,.25); }
.sticky .btn { flex: 1; min-height: 46px; }
.sticky.show { display: flex; }

footer.site { background: var(--navy-950); color: var(--muted-dark); padding: 2.5rem 0 5.5rem; font-size: .95rem; }
footer.site a { color: var(--on-dark); }
footer.site .cols { display: grid; gap: 1.2rem; }
footer.site p { margin: .35rem 0; max-width: 760px; }
.skip { position: absolute; left: -999px; } .skip:focus { left: 1rem; top: 1rem; background: #fff; padding: .6rem 1rem; z-index: 50; }

@media (min-width: 760px) {
  body { font-size: 1.25rem; }
  h1, .hero h1 { font-size: 4.2rem; } h2 { font-size: 2.8rem; } h3 { font-size: 1.6rem; }
  section.block { padding: 5.5rem 0; }
  .hero { padding: 4.5rem 0 5.5rem; }
  .hero-grid { grid-template-columns: 1.2fr .8fr; }
  .bento { grid-template-columns: repeat(3, 1fr); }
  .peek { grid-template-columns: repeat(3, 1fr); }
  .grades { grid-template-columns: repeat(3, 1fr); }
  .plan { grid-template-columns: repeat(2, 1fr); }
  .printable { grid-template-columns: 1fr 1fr; }
  .series { grid-template-columns: repeat(3, 1fr); }
  .author { grid-template-columns: auto 1fr; }
  footer.site .cols { grid-template-columns: 2fr 1fr; }
  .sticky { display: none !important; }
  footer.site { padding-bottom: 2.5rem; }
}