:root {
  --ink: #142f3b;
  --ink-soft: #36515c;
  --paper: #f4f0e7;
  --paper-deep: #e8e0d1;
  --white: #fffdf8;
  --teal: #0f766e;
  --teal-dark: #0b5d57;
  --teal-pale: #dcefeb;
  --copper: #b4633b;
  --copper-pale: #f3dfd2;
  --gold: #c79536;
  --red: #a8473d;
  --green: #427b5a;
  --line: #d6d1c7;
  --shadow: 0 18px 45px rgba(20, 47, 59, 0.10);
  --radius: 18px;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 10%, rgba(15, 118, 110, 0.08), transparent 28rem),
    linear-gradient(180deg, #faf8f2 0%, var(--paper) 100%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--teal-dark); text-underline-offset: 0.18em; }
a:hover { color: var(--copper); }
button, input, select { font: inherit; }
button { cursor: pointer; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1000;
  padding: .75rem 1rem;
  background: var(--ink);
  color: #fff;
}
.skip-link:focus { left: 1rem; top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 253, 248, .94);
  border-bottom: 1px solid rgba(20,47,59,.09);
  backdrop-filter: blur(12px);
}
.header-inner {
  max-width: var(--max);
  min-height: 72px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -.02em;
}
.brand-mark {
  width: 38px;
  height: 38px;
  border: 2px solid var(--teal);
  border-radius: 50%;
  position: relative;
  flex: 0 0 auto;
}
.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid var(--copper);
  border-radius: 50%;
  transform: rotate(35deg) scaleX(1.45);
}
.brand-mark::after {
  inset: 15px;
  background: var(--teal);
  border: 0;
  transform: none;
}
.brand small { display: block; color: var(--ink-soft); font-weight: 650; font-size: .7rem; letter-spacing: .04em; }

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
  border-radius: 10px;
  padding: .65rem .8rem;
}
.site-nav { display: flex; align-items: center; gap: 4px; }
.site-nav a {
  padding: .7rem .75rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 680;
  font-size: .92rem;
  border-radius: 9px;
}
.site-nav a:hover,
.site-nav a[aria-current="page"] { background: var(--teal-pale); color: var(--teal-dark); }
.site-nav .nav-cta { background: var(--ink); color: #fff; }
.site-nav .nav-cta:hover { background: var(--teal-dark); color: #fff; }

main { overflow: hidden; }
.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 820px; }
.section { padding: 76px 0; }
.section-tight { padding: 44px 0; }
.section-muted { background: rgba(255,255,255,.46); border-block: 1px solid rgba(20,47,59,.07); }

.hero { padding: 84px 0 66px; position: relative; }
.hero::after {
  content: "";
  position: absolute;
  width: 370px;
  height: 370px;
  right: -130px;
  top: 30px;
  border: 1px solid rgba(15,118,110,.22);
  border-radius: 50%;
  box-shadow: inset 0 0 0 42px rgba(15,118,110,.025), inset 0 0 0 100px rgba(180,99,59,.025);
  pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.28fr) minmax(310px, .72fr); gap: 56px; align-items: center; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  color: var(--teal-dark);
  font-size: .79rem;
  font-weight: 820;
  text-transform: uppercase;
  letter-spacing: .11em;
  margin-bottom: 16px;
}
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--copper); }
h1, h2, h3 { font-family: Georgia, "Times New Roman", serif; line-height: 1.12; letter-spacing: -.025em; margin: 0 0 .65em; }
h1 { font-size: clamp(2.55rem, 6vw, 5.15rem); max-width: 860px; }
h2 { font-size: clamp(2rem, 4vw, 3.25rem); }
h3 { font-size: 1.42rem; }
.lead { font-size: clamp(1.08rem, 2vw, 1.28rem); color: var(--ink-soft); max-width: 760px; }
.hero-actions, .button-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: .8rem 1.15rem;
  border-radius: 11px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 780;
  transition: transform .18s ease, background .18s ease, border-color .18s ease;
}
.button:hover { transform: translateY(-1px); }
.button-primary { background: var(--teal); color: #fff; }
.button-primary:hover { background: var(--teal-dark); color: #fff; }
.button-secondary { background: var(--white); color: var(--ink); border-color: var(--line); }
.button-secondary:hover { border-color: var(--teal); color: var(--teal-dark); }
.button-copper { background: var(--copper); color: #fff; }
.button-copper:hover { background: #955130; color: #fff; }
.button-small { min-height: 40px; padding: .6rem .85rem; font-size: .9rem; }

.hero-panel,
.card,
.panel,
.predictor-shell,
.result-card,
.book-card,
.quote-card {
  background: rgba(255,253,248,.95);
  border: 1px solid rgba(20,47,59,.11);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero-panel { padding: 26px; transform: rotate(1.2deg); }
.hero-panel .panel-kicker { color: var(--copper); font-weight: 800; text-transform: uppercase; letter-spacing: .08em; font-size: .74rem; }
.hero-panel ul { padding-left: 1.1rem; margin-bottom: 0; }
.hero-panel li + li { margin-top: .45rem; }

.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 22px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 18px; }
.card { padding: 27px; }
.card p:last-child { margin-bottom: 0; }
.card-link { text-decoration: none; color: inherit; position: relative; overflow: hidden; }
.card-link::after { content: "→"; display: block; margin-top: 22px; font-size: 1.4rem; color: var(--copper); }
.card-link:hover { border-color: rgba(15,118,110,.45); color: inherit; }
.card-label { color: var(--teal-dark); text-transform: uppercase; font-weight: 820; letter-spacing: .09em; font-size: .72rem; }

.section-heading { max-width: 780px; margin-bottom: 34px; }
.section-heading p { color: var(--ink-soft); font-size: 1.08rem; }

.stat-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 24px; }
.stat-pill { border: 1px solid var(--line); background: var(--white); border-radius: 999px; padding: .55rem .8rem; font-size: .88rem; font-weight: 720; }

.notice {
  padding: 18px 20px;
  border-radius: 13px;
  border-left: 4px solid var(--teal);
  background: var(--teal-pale);
  color: var(--ink);
}
.notice-copper { border-color: var(--copper); background: var(--copper-pale); }
.notice-warning { border-color: var(--gold); background: #f8edcf; }
.notice-danger { border-color: var(--red); background: #f4ddda; }
.notice p:last-child { margin-bottom: 0; }

.disclosure { font-size: .88rem; color: var(--ink-soft); background: rgba(255,255,255,.55); border: 1px solid var(--line); padding: 12px 15px; border-radius: 10px; }

.board-banner { padding: 72px 0 42px; }
.board-banner .lead { max-width: 850px; }
.breadcrumbs { font-size: .86rem; color: var(--ink-soft); margin-bottom: 18px; }
.breadcrumbs a { color: inherit; }

.recommendation-summary { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; margin: 30px 0; }
.summary-box { background: var(--white); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.summary-box strong { display: block; color: var(--teal-dark); margin-bottom: .35rem; }

.book-list { display: grid; gap: 26px; }
.book-card { display: grid; grid-template-columns: 205px minmax(0,1fr); overflow: hidden; }
.book-cover {
  min-height: 290px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: #fff;
  background:
    linear-gradient(145deg, rgba(255,255,255,.12), transparent 35%),
    linear-gradient(155deg, var(--ink), var(--teal-dark));
  border-right: 6px solid rgba(0,0,0,.14);
  box-shadow: inset -14px 0 20px rgba(0,0,0,.1);
}
.book-cover.copper { background: linear-gradient(155deg, #6f2f22, var(--copper)); }
.book-cover.gold { background: linear-gradient(155deg, #5b4522, var(--gold)); }
.book-cover.light { background: linear-gradient(155deg, #e9e3d6, #b7c5bf); color: var(--ink); }
.book-cover .book-series { text-transform: uppercase; letter-spacing: .13em; font-size: .7rem; font-weight: 800; }
.book-cover .book-title { font-family: Georgia, serif; font-size: 1.55rem; line-height: 1.08; }
.book-cover .book-author { font-size: .82rem; opacity: .9; }
.book-body { padding: 28px; }
.badge-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.badge { display: inline-flex; padding: .32rem .58rem; border-radius: 999px; background: var(--teal-pale); color: var(--teal-dark); font-size: .75rem; font-weight: 820; }
.badge-copper { background: var(--copper-pale); color: #753b22; }
.badge-neutral { background: #ece9e2; color: var(--ink-soft); }
.pros-cons { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 20px 0; }
.pros-cons ul { margin: 0; padding-left: 1.1rem; }
.pros-cons li + li { margin-top: .35rem; }
.expert-note { border-top: 1px solid var(--line); margin-top: 22px; padding-top: 18px; color: var(--ink-soft); }
.expert-note strong { color: var(--ink); }

.comparison-table { width: 100%; border-collapse: collapse; background: var(--white); border-radius: 14px; overflow: hidden; box-shadow: 0 10px 30px rgba(20,47,59,.06); }
.comparison-table th, .comparison-table td { padding: 15px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
.comparison-table th { background: var(--ink); color: #fff; font-size: .86rem; }
.comparison-table tr:last-child td { border-bottom: 0; }
.table-wrap { overflow-x: auto; border-radius: 14px; }

.author-box { display: grid; grid-template-columns: 96px minmax(0,1fr); gap: 22px; align-items: center; padding: 24px; background: var(--white); border: 1px solid var(--line); border-radius: 16px; }
.author-avatar { width: 86px; height: 86px; border-radius: 50%; display: grid; place-items: center; background: var(--ink); color: #fff; font-family: Georgia, serif; font-size: 1.6rem; }

/* Predictor */
.predictor-shell { padding: 30px; margin: 32px 0; }
.predictor-shell fieldset { border: 0; padding: 0; margin: 0 0 32px; }
.predictor-shell legend { font-family: Georgia, serif; font-size: 1.55rem; font-weight: 700; margin-bottom: 12px; }
.step-note { color: var(--ink-soft); margin-top: -.3rem; }
.form-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 17px; }
.form-grid-3 { grid-template-columns: repeat(3,minmax(0,1fr)); }
.form-group { min-width: 0; }
.form-group label, .group-label { display: block; font-weight: 760; margin-bottom: 6px; }
.form-help { display: block; color: var(--ink-soft); font-size: .82rem; margin-top: 5px; }
input[type="number"], input[type="text"], select {
  width: 100%; min-height: 48px; border: 1px solid #bfc7c6; border-radius: 10px; padding: .72rem .8rem; background: #fff; color: var(--ink);
}
input:focus, select:focus, button:focus-visible, a:focus-visible { outline: 3px solid rgba(15,118,110,.24); outline-offset: 2px; border-color: var(--teal); }
.radio-row { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; }
.radio-card { position: relative; }
.radio-card input { position: absolute; opacity: 0; pointer-events: none; }
.radio-card label { display: block; height: 100%; border: 2px solid var(--line); background: #fff; border-radius: 13px; padding: 16px; cursor: pointer; }
.radio-card input:checked + label { border-color: var(--teal); background: var(--teal-pale); }
.radio-card strong { display: block; margin-bottom: 4px; }
.subject-row { display: grid; grid-template-columns: 1.25fr .75fr; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.subject-row:last-child { border-bottom: 0; }
.hidden { display: none !important; }
.form-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.form-error { display: none; margin-bottom: 18px; }
.form-error.visible { display: block; }

.results { margin-top: 44px; }
.results-header { display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; margin-bottom: 22px; }
.results-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 20px; }
.result-card { padding: 24px; box-shadow: 0 12px 30px rgba(20,47,59,.08); }
.result-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.grade-disc { width: 68px; height: 68px; flex: 0 0 auto; border-radius: 50%; display: grid; place-items: center; background: var(--ink); color: #fff; font-family: Georgia, serif; font-size: 1.8rem; font-weight: 700; }
.range-label { color: var(--ink-soft); font-size: .9rem; }
.grade-track { display: grid; grid-template-columns: repeat(7,1fr); gap: 3px; margin: 20px 0 8px; }
.grade-segment { height: 12px; background: #e4e1db; border-radius: 4px; }
.grade-segment.in-range { background: var(--teal); }
.grade-segment.central { background: var(--copper); transform: scaleY(1.35); }
.grade-labels { display: grid; grid-template-columns: repeat(7,1fr); text-align: center; font-size: .72rem; color: var(--ink-soft); }
.evidence-list { list-style: none; padding: 0; margin: 18px 0 0; font-size: .9rem; color: var(--ink-soft); }
.evidence-list li { display: flex; justify-content: space-between; gap: 16px; padding: 7px 0; border-top: 1px solid var(--line); }
.evidence-list strong { color: var(--ink); }
.advice-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; margin-top: 24px; }
.advice-item { border: 1px solid var(--line); background: var(--white); border-radius: 13px; padding: 18px; }
.advice-item h3 { font-family: inherit; font-size: 1rem; letter-spacing: 0; margin-bottom: 6px; }
.method-note { margin-top: 26px; font-size: .89rem; color: var(--ink-soft); }

/* Vocabulary game */
.quiz-shell { max-width: 820px; margin: 28px auto; }
.quiz-question { font-family: Georgia, serif; font-size: 1.45rem; }
.quiz-options { display: grid; gap: 10px; margin: 20px 0; }
.quiz-option { text-align: left; border: 1px solid var(--line); background: #fff; color: var(--ink); border-radius: 11px; padding: 14px; }
.quiz-option:hover { border-color: var(--teal); }
.quiz-option.correct { background: #dcecdf; border-color: var(--green); }
.quiz-option.incorrect { background: #f3dddd; border-color: var(--red); }
.quiz-meta { display: flex; justify-content: space-between; gap: 15px; color: var(--ink-soft); font-size: .9rem; }

.accordion { display: grid; gap: 10px; }
details { background: var(--white); border: 1px solid var(--line); border-radius: 12px; padding: 0 18px; }
summary { cursor: pointer; font-weight: 760; padding: 16px 0; }
details p { margin-top: 0; }

.site-footer { background: var(--ink); color: #d9e3e4; padding: 50px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 34px; }
.site-footer a { color: #f4d7c5; }
.site-footer h3 { color: #fff; font-family: inherit; font-size: 1rem; letter-spacing: 0; }
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li + li { margin-top: .5rem; }
.footer-bottom { margin-top: 36px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.13); font-size: .82rem; color: #b9c9cc; display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }

@media (max-width: 900px) {
  .hero-grid, .grid-3, .footer-grid { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .recommendation-summary { grid-template-columns: 1fr; }
  .hero-panel { transform: none; }
  .book-card { grid-template-columns: 170px minmax(0,1fr); }
}

@media (max-width: 760px) {
  .header-inner { min-height: 64px; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 18px 18px;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 12px 24px rgba(20,47,59,.10);
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: .8rem; }
  .hero { padding-top: 58px; }
  .grid-2, .results-grid, .advice-grid, .form-grid, .form-grid-3, .pros-cons { grid-template-columns: 1fr; }
  .radio-row { grid-template-columns: 1fr; }
  .book-card { grid-template-columns: 1fr; }
  .book-cover { min-height: 210px; border-right: 0; border-bottom: 6px solid rgba(0,0,0,.14); }
  .author-box { grid-template-columns: 1fr; }
  .subject-row { grid-template-columns: 1fr; }
  .results-header { align-items: flex-start; flex-direction: column; }
  .comparison-table th, .comparison-table td { min-width: 160px; }
}

@media (max-width: 520px) {
  .container { padding: 0 17px; }
  .section { padding: 58px 0; }
  .hero { padding: 48px 0; }
  h1 { font-size: 2.6rem; }
  .predictor-shell { padding: 20px 16px; border-radius: 14px; }
  .grid-4 { grid-template-columns: 1fr; }
  .brand span:last-child { font-size: .88rem; }
}

/* Version 1.1 predictor and book-cover refinements */
.subject-entry-grid {
  display: grid;
  gap: 18px;
}
.subject-entry {
  display: grid;
  grid-template-columns: minmax(180px, 1.05fr) minmax(180px, 1fr) minmax(180px, .92fr) minmax(220px, 1.25fr);
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255,255,255,.62);
}
.subject-entry-optional { background: rgba(232,224,209,.3); }
.subject-entry .form-group { margin: 0; }
.input-suffix { position: relative; }
.input-suffix input { padding-right: 92px; }
.input-suffix span {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ink-soft);
  font-size: .78rem;
  pointer-events: none;
}
.calculation-details {
  margin-top: 16px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
  color: var(--ink-soft);
  font-size: .88rem;
}
.calculation-details summary {
  color: var(--teal-dark);
  cursor: pointer;
  font-weight: 750;
}
.calculation-details p { margin: .65rem 0 0; }
.book-cover-image {
  min-height: 290px;
  padding: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: linear-gradient(145deg, #ece7dc, #d7dfdc);
  border-right: 1px solid rgba(20,47,59,.1);
  overflow: hidden;
}
.book-cover-image img {
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 310px;
  object-fit: contain;
  box-shadow: 0 13px 24px rgba(20,47,59,.18);
  position: relative;
  z-index: 2;
}
.cover-fallback {
  display: none;
  max-width: 170px;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  text-align: center;
  font-weight: 700;
  line-height: 1.25;
}
.book-cover-image img:not([src]),
.book-cover-image img[src=""] { display: none; }
.book-cover-image img:not([src]) + .cover-fallback,
.book-cover-image img[src=""] + .cover-fallback { display: block; }

@media (max-width: 980px) {
  .subject-entry { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 680px) {
  .subject-entry { grid-template-columns: 1fr; padding: 15px; }
  .book-cover-image { min-height: 250px; border-right: 0; border-bottom: 1px solid rgba(20,47,59,.1); }
  .book-cover-image img { max-height: 270px; }
}