:root {
    color-scheme: light;
    --navy-950: #08182d;
    --navy-900: #10294a;
    --navy-700: #1e4b78;
    --navy-100: #dceaf5;
    --navy-50: #f3f8fc;
    --orange-600: #d85b0b;
    --orange-500: #f47820;
    --orange-100: #ffe6d4;
    --orange-50: #fff7f1;
    --ink-900: #17212f;
    --ink-600: #586474;
    --ink-300: #c7d0da;
    --ink-100: #e8edf2;
    --canvas: #f6f8fb;
    --paper: #fff;
    --success: #18794e;
    --warning: #9a5b00;
    --error: #b42318;
    --space-1: .25rem;
    --space-2: .5rem;
    --space-3: .75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-24: 6rem;
    --radius-input: 6px;
    --radius-button: 8px;
    --radius-card: 12px;
    --radius-panel: 18px;
    --shadow-sm: 0 4px 14px rgb(16 41 74 / .08), 0 1px 3px rgb(16 41 74 / .06);
    --shadow-lg: 0 16px 40px rgb(16 41 74 / .1), 0 3px 10px rgb(16 41 74 / .06);
    --ease-out: cubic-bezier(.16, 1, .3, 1);
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    background: var(--canvas);
    color: var(--ink-900);
    font-family: Aptos, "Segoe UI", system-ui, -apple-system, sans-serif;
    font-size: 1rem;
    line-height: 1.65;
    text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; height: auto; }
a { color: var(--navy-700); text-underline-offset: .18em; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }

h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { color: var(--navy-950); text-wrap: balance; }
h1 { margin-bottom: var(--space-6); font-size: clamp(2.75rem, 7vw, 5.75rem); line-height: .95; letter-spacing: -.045em; }
h2 { margin-bottom: var(--space-6); font-size: clamp(2rem, 4vw, 3.5rem); line-height: 1.03; letter-spacing: -.035em; }
h3 { margin-bottom: var(--space-3); font-size: 1.35rem; line-height: 1.2; letter-spacing: -.02em; }

:focus-visible { outline: 3px solid var(--orange-500); outline-offset: 3px; }
.skip-link { position: fixed; z-index: 100; top: var(--space-4); left: var(--space-4); transform: translateY(-160%); padding: .65rem 1rem; background: var(--navy-950); color: white; border-radius: var(--radius-button); }
.skip-link:focus { transform: translateY(0); }
.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; }
.shell { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }
.shell--narrow { width: min(800px, calc(100% - 40px)); }
.shell--reading { width: min(720px, calc(100% - 40px)); }
.section-pad { padding-block: clamp(4.5rem, 9vw, 7.5rem); }
.kicker { margin-bottom: var(--space-4); color: var(--orange-600); font-size: .79rem; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.lede { max-width: 720px; color: var(--ink-600); font-size: clamp(1.1rem, 2vw, 1.35rem); line-height: 1.55; }

.site-header { position: sticky; z-index: 20; top: 0; background: rgb(255 255 255 / .94); border-bottom: 1px solid var(--ink-100); backdrop-filter: blur(12px); }
.header-inner { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: var(--space-8); }
.brand { display: block; flex: 0 1 340px; }
.brand img { width: min(340px, 100%); }
.site-nav { display: flex; align-items: center; gap: var(--space-8); }
.site-nav a { position: relative; min-height: 44px; display: inline-flex; align-items: center; color: var(--ink-600); font-size: .95rem; font-weight: 650; text-decoration: none; transition: color 150ms ease-out; }
.site-nav a::after { content: ""; position: absolute; right: 0; bottom: 8px; left: 0; height: 2px; transform: scaleX(0); transform-origin: left; background: var(--orange-500); transition: transform 180ms var(--ease-out); }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--navy-900); }
.site-nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav-toggle { display: none; width: 44px; height: 44px; padding: 11px 9px; background: var(--paper); border: 1px solid var(--ink-300); border-radius: var(--radius-button); }
.nav-toggle span[aria-hidden] { display: block; height: 2px; margin: 4px 0; background: var(--navy-900); }

.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2); padding: .7rem 1.2rem; border: 1px solid transparent; border-radius: var(--radius-button); font-weight: 720; line-height: 1.2; text-decoration: none; transition: color 150ms ease-out, background-color 150ms ease-out, border-color 150ms ease-out, box-shadow 150ms ease-out, transform 80ms ease-out; }
.button:active { transform: scale(.98); }
.button--primary { background: var(--orange-600); color: white; box-shadow: 0 8px 18px rgb(216 91 11 / .2), 0 2px 5px rgb(16 41 74 / .08); }
.button--primary:hover { background: var(--navy-900); color: white; box-shadow: var(--shadow-sm); }
.button--secondary { background: transparent; color: var(--navy-900); border-color: var(--ink-300); }
.button--secondary:hover { background: var(--navy-50); border-color: var(--navy-700); }
.text-link { display: inline-flex; align-items: center; min-height: 44px; color: var(--navy-900); font-weight: 750; text-decoration-color: var(--orange-500); text-decoration-thickness: 2px; }
.back-link { display: inline-flex; min-height: 44px; align-items: center; margin-bottom: var(--space-8); color: var(--ink-600); font-weight: 650; text-decoration: none; }

.home-hero { position: relative; overflow: hidden; min-height: min(800px, calc(100vh - 74px)); display: grid; align-items: center; padding-block: clamp(4rem, 8vw, 7rem); background: linear-gradient(115deg, var(--navy-50), var(--paper) 62%); }
.home-hero::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 7px; background: var(--orange-500); }
.home-hero-grid { display: grid; grid-template-columns: minmax(0, .95fr) minmax(420px, 1.05fr); align-items: center; gap: clamp(3rem, 7vw, 7rem); }
.hero-copy { padding-top: 4vh; }
.hero-copy h1 em { display: inline-block; color: var(--navy-700); font-family: Georgia, "Times New Roman", serif; font-weight: 400; }
.hero-sub { max-width: 560px; margin-bottom: var(--space-8); color: var(--ink-600); font-size: 1.2rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.micro-trust { margin-top: var(--space-4); color: var(--ink-600); font-size: .85rem; }
.book-stage { position: relative; min-height: 540px; display: flex; align-items: center; justify-content: center; }
.book-cover { position: relative; z-index: 2; width: min(310px, 64%); box-shadow: 22px 28px 50px rgb(8 24 45 / .26), 6px 8px 18px rgb(8 24 45 / .16); transform: rotate(-2deg); }
.book-shadow { position: absolute; z-index: 0; width: 340px; height: 420px; transform: translate(14px, 24px) rotate(-2deg); background: var(--navy-900); opacity: .16; filter: blur(24px); }
.chapter-tabs { position: absolute; z-index: 1; top: 13%; right: 0; width: 58%; margin: 0; padding: 0; list-style: none; }
.chapter-tabs li { margin-bottom: var(--space-3); }
.chapter-tabs a { display: flex; align-items: center; gap: var(--space-3); min-height: 54px; padding: .55rem 1rem .55rem 4.7rem; background: var(--paper); color: var(--navy-900); border: 1px solid var(--ink-100); border-radius: 0 var(--radius-button) var(--radius-button) 0; box-shadow: var(--shadow-sm); font-size: .88rem; font-weight: 720; line-height: 1.15; text-decoration: none; transition: transform 180ms var(--ease-out), box-shadow 180ms ease-out; }
.chapter-tabs a:hover { transform: translateX(8px); box-shadow: var(--shadow-lg); }
.chapter-tabs span { flex: none; color: var(--orange-600); font-variant-numeric: tabular-nums; }

.proof-band { background: var(--navy-950); color: white; }
.proof-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.proof-grid p { min-height: 130px; display: flex; align-items: center; justify-content: center; gap: var(--space-4); margin: 0; border-right: 1px solid rgb(255 255 255 / .12); }
.proof-grid p:last-child { border-right: 0; }
.proof-grid strong { color: var(--orange-500); font-size: clamp(2.4rem, 5vw, 4rem); line-height: 1; font-variant-numeric: tabular-nums; }
.proof-grid span { max-width: 110px; color: rgb(255 255 255 / .72); line-height: 1.25; }

.section-heading { max-width: 760px; margin-bottom: var(--space-16); }
.section-heading--split { max-width: none; display: grid; grid-template-columns: 1.3fr .7fr; align-items: end; gap: var(--space-12); }
.section-heading--split h2 { margin-bottom: 0; }
.section-heading--split > p { margin-bottom: 0; color: var(--ink-600); }
.chapter-section { background: var(--paper); }
.chapter-path { position: relative; }
.chapter-path::before { content: ""; position: absolute; top: 0; bottom: 0; left: 27px; width: 2px; background: var(--orange-100); }
.path-stop { position: relative; display: grid; grid-template-columns: 56px 160px minmax(0, 1fr); gap: var(--space-8); align-items: center; min-height: 190px; padding-block: var(--space-6); border-bottom: 1px solid var(--ink-100); }
.path-stop:last-child { border-bottom: 0; }
.path-number { position: relative; z-index: 1; width: 56px; height: 56px; display: grid; place-items: center; background: var(--paper); color: var(--orange-600); border: 2px solid var(--orange-500); border-radius: 50%; font-size: 1.1rem; font-weight: 800; font-variant-numeric: tabular-nums; }
.path-stop img { width: 160px; height: 132px; object-fit: cover; border-radius: var(--radius-card); box-shadow: var(--shadow-sm); }
.path-stop p { max-width: 620px; margin-bottom: var(--space-2); color: var(--ink-600); }

.self-check-section { background: var(--navy-50); }
.self-check-grid { display: grid; grid-template-columns: minmax(0, .8fr) minmax(360px, 1.2fr); align-items: center; gap: clamp(3rem, 8vw, 8rem); }
.self-check-copy p:not(.kicker) { max-width: 540px; color: var(--ink-600); }
.reflection-lines { display: grid; gap: var(--space-6); padding: var(--space-12); background: var(--paper); border-radius: var(--radius-panel); box-shadow: var(--shadow-lg); transform: rotate(1deg); }
.reflection-lines span { height: 18px; border-bottom: 2px solid var(--navy-100); }
.reflection-lines span:nth-child(2) { width: 84%; }
.reflection-lines span:nth-child(3) { width: 92%; }
.reflection-lines span::before { content: ""; display: block; width: 13px; height: 13px; transform: translate(-27px, 12px); border: 2px solid var(--orange-500); border-radius: 3px; }
.final-cta { background: var(--paper); }
.final-cta-inner { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--space-12); padding: clamp(2rem, 6vw, 4.5rem); background: var(--navy-900); border-radius: var(--radius-panel); box-shadow: var(--shadow-lg); }
.final-cta h2 { max-width: 700px; margin-bottom: 0; color: white; }
.final-cta .kicker { color: #ff9b57; }
.final-cta .button--primary { flex: none; }

.page-hero, .activity-hero, .legal-hero { padding-block: clamp(4rem, 8vw, 7rem); background: var(--paper); border-bottom: 1px solid var(--ink-100); }
.page-hero-grid, .activity-hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, .58fr); align-items: center; gap: clamp(3rem, 8vw, 8rem); }
.page-hero h1 { max-width: 820px; font-size: clamp(3rem, 6vw, 5.4rem); }
.page-hero--book img { width: min(330px, 100%); justify-self: center; box-shadow: 20px 26px 48px rgb(8 24 45 / .22), 4px 6px 14px rgb(8 24 45 / .14); transform: rotate(2deg); }
.page-hero--library { background: var(--navy-50); }
.library-search { max-width: 600px; margin-top: var(--space-12); }
.library-search label { display: block; margin-bottom: var(--space-2); font-weight: 720; }
.library-search input { width: 100%; min-height: 56px; padding: .8rem 1rem; background: var(--paper); border: 1px solid var(--ink-300); border-radius: var(--radius-input); box-shadow: var(--shadow-sm); font-size: 1rem; }
.library-search p { min-height: 1.5rem; margin: var(--space-2) 0 0; color: var(--ink-600); font-size: .9rem; }
.reading-grid { display: grid; grid-template-columns: .65fr 1.35fr; gap: clamp(3rem, 7vw, 7rem); }
.reading-grid > div p { color: var(--ink-600); font-size: 1.1rem; }
.pull-quote { position: sticky; top: 120px; padding-left: var(--space-6); color: var(--navy-700); border-left: 4px solid var(--orange-500); font-family: Georgia, "Times New Roman", serif; font-size: 1.65rem; line-height: 1.35; }
.topics-section { background: var(--navy-50); }
.topic-list { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--ink-300); }
.topic-list article { padding: var(--space-8) var(--space-8) var(--space-8) 0; border-bottom: 1px solid var(--ink-300); }
.topic-list article:nth-child(odd) { padding-right: var(--space-12); border-right: 1px solid var(--ink-300); }
.topic-list article:nth-child(even) { padding-left: var(--space-12); }
.topic-list p { margin: 0; color: var(--ink-600); }

.library-section { background: var(--paper); }
.assessment-library { background: var(--navy-50); }
.activity-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-8); }
.activity-card { min-width: 0; display: grid; grid-template-columns: 180px minmax(0, 1fr); overflow: hidden; background: var(--paper); border: 1px solid var(--ink-100); border-radius: var(--radius-card); box-shadow: var(--shadow-sm); transition: transform 180ms var(--ease-out), box-shadow 180ms ease-out; }
.activity-card--featured { grid-column: span 2; grid-template-columns: minmax(280px, .8fr) minmax(0, 1.2fr); }
.activity-card[hidden] { display: none; }
.activity-image-wrap { position: relative; min-height: 220px; overflow: hidden; background: var(--navy-50); }
.activity-image-wrap img { width: 100%; height: 100%; object-fit: cover; }
.activity-type { position: absolute; top: var(--space-3); left: var(--space-3); padding: .3rem .55rem; background: rgb(8 24 45 / .88); color: white; border-radius: var(--radius-input); font-size: .72rem; font-weight: 750; }
.activity-copy { display: flex; flex-direction: column; align-items: flex-start; padding: var(--space-8); }
.activity-copy p { color: var(--ink-600); }
.activity-copy .text-link { margin-top: auto; }
.activity-meta { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-bottom: var(--space-4); color: var(--ink-600); font-size: .78rem; }
.activity-meta span + span::before { content: "·"; margin-right: var(--space-3); color: var(--orange-500); }

.activity-hero { background: var(--navy-50); }
.activity-hero h1 { max-width: 760px; font-size: clamp(3rem, 6vw, 5rem); }
.activity-hero-image { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: var(--radius-panel); box-shadow: var(--shadow-lg); }
.activity-facts { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-8); color: var(--ink-600); font-size: .82rem; font-weight: 650; }
.activity-facts span { padding: .35rem .65rem; background: var(--paper); border: 1px solid var(--ink-100); border-radius: 999px; }
.quiz-stage { background: var(--paper); }
.gate-panel { position: relative; padding: clamp(2rem, 6vw, 4.5rem); overflow: hidden; background: var(--navy-50); border: 1px solid var(--navy-100); border-radius: var(--radius-panel); box-shadow: var(--shadow-lg); }
.gate-panel h2 { max-width: 600px; }
.gate-panel > p:not(.kicker) { max-width: 630px; color: var(--ink-600); }
.step-marker { position: absolute; top: -28px; right: 24px; color: rgb(30 75 120 / .08); font-size: 12rem; font-weight: 850; line-height: 1; }
.compact-form { position: relative; max-width: 640px; margin-top: var(--space-8); }
.compact-form > label, .field > label, .stack-form > label { display: block; margin-bottom: var(--space-2); color: var(--navy-950); font-weight: 720; }
.input-action { display: flex; gap: var(--space-3); }
.input-action input { flex: 1; min-width: 0; }
input, textarea { width: 100%; min-height: 48px; padding: .7rem .85rem; background: var(--paper); color: var(--ink-900); border: 1px solid var(--ink-300); border-radius: var(--radius-input); }
textarea { resize: vertical; }
input:hover, textarea:hover { border-color: var(--navy-700); }
input[aria-invalid="true"], textarea[aria-invalid="true"] { border-color: var(--error); }
.field-help { margin: var(--space-2) 0 0; color: var(--ink-600); font-size: .85rem; }
.field-error { margin: var(--space-2) 0 0; color: var(--error); font-size: .88rem; font-weight: 650; }
.stack-form { display: grid; gap: var(--space-6); max-width: 620px; margin-top: var(--space-8); }
.field label span { color: var(--ink-600); font-weight: 400; }
.notice { padding: .85rem 1rem; margin-block: var(--space-6); border-radius: var(--radius-button); font-weight: 600; }
.notice--error { background: #fff1f0; color: var(--error); border: 1px solid #f1b8b3; }
.notice--success { background: #effaf5; color: var(--success); border: 1px solid #acd8c5; }
.honeypot { position: absolute !important; left: -10000px !important; width: 1px !important; height: 1px !important; overflow: hidden !important; }

.quiz-progress { position: sticky; z-index: 10; top: 86px; display: grid; grid-template-columns: auto 1fr; align-items: center; gap: var(--space-6); margin-bottom: var(--space-8); padding: .75rem 1rem; background: rgb(255 255 255 / .95); border: 1px solid var(--ink-100); border-radius: var(--radius-button); box-shadow: var(--shadow-sm); backdrop-filter: blur(8px); color: var(--ink-600); font-size: .88rem; }
.quiz-progress strong { color: var(--navy-900); font-variant-numeric: tabular-nums; }
.progress-track { height: 7px; overflow: hidden; background: var(--ink-100); border-radius: 999px; }
.progress-track span { display: block; width: 0; height: 100%; background: var(--orange-500); border-radius: inherit; transition: width 240ms var(--ease-out); }
.quiz-form { display: grid; gap: var(--space-6); }
.question-card { margin: 0; padding: var(--space-8); background: var(--paper); border: 1px solid var(--ink-100); border-radius: var(--radius-card); box-shadow: var(--shadow-sm); }
.question-card legend { width: 100%; padding: 0; color: var(--navy-950); font-size: 1.2rem; font-weight: 720; line-height: 1.4; }
.question-card legend span { display: block; margin-bottom: var(--space-2); color: var(--orange-600); font-size: .75rem; letter-spacing: .08em; text-transform: uppercase; }
.answer-list { display: grid; gap: var(--space-3); margin-top: var(--space-6); }
.answer-choice { position: relative; display: flex; align-items: flex-start; gap: var(--space-3); min-height: 52px; padding: .8rem 1rem; background: var(--canvas); border: 1px solid var(--ink-100); border-radius: 10px; cursor: pointer; transition: background-color 150ms ease-out, border-color 150ms ease-out, box-shadow 150ms ease-out; }
.answer-choice:hover { border-color: var(--navy-700); }
.answer-choice:has(input:checked) { background: var(--orange-50); border-color: var(--orange-500); box-shadow: 0 0 0 2px var(--orange-100); }
.answer-choice input { flex: none; width: 20px; min-height: 20px; height: 20px; margin: .14rem 0 0; accent-color: var(--orange-600); }
.answer-choice span { line-height: 1.45; }
.submit-panel { display: flex; align-items: center; justify-content: space-between; gap: var(--space-8); margin-top: var(--space-4); padding: var(--space-8); background: var(--navy-950); color: white; border-radius: var(--radius-panel); }
.submit-panel strong, .submit-panel span { display: block; }
.submit-panel span { color: rgb(255 255 255 / .7); font-size: .9rem; }
.result-panel { padding: clamp(2.5rem, 7vw, 5rem); background: var(--navy-50); border: 1px solid var(--navy-100); border-radius: var(--radius-panel); box-shadow: var(--shadow-lg); text-align: center; }
.result-panel > p:not(.kicker, .result-score) { max-width: 640px; margin-inline: auto; color: var(--ink-600); }
.result-score { margin-bottom: var(--space-3); color: var(--orange-600); font-size: clamp(4rem, 10vw, 7rem); font-weight: 820; line-height: 1; letter-spacing: -.06em; font-variant-numeric: tabular-nums; }
.result-actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: var(--space-3); margin-top: var(--space-8); }
.certificate { margin-top: var(--space-16); padding: clamp(2rem, 7vw, 5rem); background: var(--paper); border: 12px double var(--navy-900); text-align: center; }
.certificate img { width: min(330px, 80%); margin: 0 auto var(--space-12); }
.certificate > p:first-of-type { color: var(--orange-600); font-size: 1rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.certificate h2 { margin-bottom: var(--space-3); font-family: Georgia, "Times New Roman", serif; font-weight: 400; }
.certificate h3 { color: var(--navy-700); font-size: 1.7rem; }

.page-hero--contact { background: var(--navy-50); }
.contact-note { padding: var(--space-8); background: var(--paper); border: 1px solid var(--ink-100); border-radius: var(--radius-panel); box-shadow: var(--shadow-lg); }
.contact-note p { margin-bottom: 0; color: var(--ink-600); }
.contact-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(280px, .55fr); gap: clamp(3rem, 8vw, 8rem); align-items: start; }
.contact-grid > div > p { color: var(--ink-600); }
.contact-aside { position: sticky; top: 110px; padding: var(--space-8); background: var(--navy-950); color: white; border-radius: var(--radius-panel); box-shadow: var(--shadow-lg); }
.contact-aside a { color: white; font-weight: 720; overflow-wrap: anywhere; }
.contact-aside hr { margin-block: var(--space-8); border: 0; border-top: 1px solid rgb(255 255 255 / .16); }
.contact-aside .kicker { color: #ff9b57; }
.contact-aside p:last-child { color: rgb(255 255 255 / .7); }
.legal-hero { background: var(--navy-50); }
.legal-hero h1 { margin-bottom: var(--space-3); font-size: clamp(3rem, 6vw, 5rem); }
.legal-hero p:last-child { color: var(--ink-600); }
.legal-copy { background: var(--paper); }
.legal-copy > p { color: var(--ink-600); font-size: 1.05rem; }
.legal-copy h2 { margin-top: var(--space-12); font-size: 1.8rem; }
.not-found { min-height: 65vh; display: grid; align-items: center; background: var(--paper); text-align: center; }

.site-footer { padding-block: var(--space-16); background: var(--navy-950); color: rgb(255 255 255 / .72); }
.footer-grid { display: grid; grid-template-columns: 1fr auto; gap: var(--space-8); align-items: start; }
.footer-logo { width: min(310px, 100%); margin-bottom: var(--space-4); filter: brightness(0) invert(1); opacity: .92; }
.site-footer p { margin-bottom: 0; }
.site-footer nav { display: flex; gap: var(--space-6); }
.site-footer a { min-height: 44px; display: inline-flex; align-items: center; color: white; }
.copyright { grid-column: 1 / -1; padding-top: var(--space-8); border-top: 1px solid rgb(255 255 255 / .12); font-size: .85rem; }

@media (hover: hover) and (pointer: fine) {
    .activity-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
}

@media (max-width: 920px) {
    .home-hero { min-height: auto; }
    .home-hero-grid, .page-hero-grid, .activity-hero-grid { grid-template-columns: 1fr; }
    .book-stage { min-height: 500px; }
    .chapter-tabs { right: 5%; }
    .page-hero--book img { width: min(300px, 72vw); }
    .activity-hero-image { max-height: 420px; }
    .section-heading--split, .self-check-grid, .reading-grid, .contact-grid { grid-template-columns: 1fr; }
    .pull-quote, .contact-aside { position: static; }
    .activity-card { grid-template-columns: 150px minmax(0, 1fr); }
    .activity-card--featured { grid-template-columns: minmax(220px, .7fr) minmax(0, 1.3fr); }
}

@media (max-width: 720px) {
    .shell, .shell--narrow, .shell--reading { width: min(100% - 28px, 1160px); }
    .section-pad { padding-block: 4rem; }
    .header-inner { min-height: 66px; }
    .brand { flex-basis: 255px; }
    .nav-toggle { display: block; flex: none; }
    .site-nav { position: absolute; top: calc(100% + 1px); right: 0; left: 0; display: none; padding: var(--space-3) 14px var(--space-6); background: var(--paper); border-bottom: 1px solid var(--ink-100); box-shadow: var(--shadow-lg); }
    .site-nav[data-open="true"] { display: grid; }
    .site-nav a { padding-inline: var(--space-3); }
    .site-nav a::after { right: var(--space-3); left: var(--space-3); }
    .home-hero { padding-block: 4rem; }
    .hero-copy { padding-top: 0; }
    .hero-actions, .input-action { align-items: stretch; flex-direction: column; }
    .hero-actions .button, .input-action .button { width: 100%; }
    .book-stage { min-height: 450px; justify-content: flex-start; padding-left: 5%; }
    .book-cover { width: 58%; }
    .book-shadow { width: 58%; height: 350px; }
    .chapter-tabs { top: 15%; right: 0; width: 57%; }
    .chapter-tabs a { min-height: 50px; padding-left: 2.7rem; font-size: .76rem; }
    .proof-grid { grid-template-columns: 1fr; padding-block: var(--space-6); }
    .proof-grid p { min-height: 86px; justify-content: flex-start; border-right: 0; border-bottom: 1px solid rgb(255 255 255 / .12); }
    .proof-grid p:last-child { border-bottom: 0; }
    .section-heading--split { gap: var(--space-3); }
    .path-stop { grid-template-columns: 44px 86px minmax(0, 1fr); gap: var(--space-4); align-items: start; }
    .chapter-path::before { left: 21px; }
    .path-number { width: 44px; height: 44px; }
    .path-stop img { width: 86px; height: 102px; }
    .final-cta-inner, .submit-panel { align-items: stretch; flex-direction: column; }
    .topic-list { grid-template-columns: 1fr; }
    .topic-list article, .topic-list article:nth-child(odd), .topic-list article:nth-child(even) { padding: var(--space-6) 0; border-right: 0; }
    .activity-grid { grid-template-columns: 1fr; }
    .activity-card, .activity-card--featured { grid-column: auto; grid-template-columns: 1fr; }
    .activity-image-wrap { min-height: 230px; max-height: 280px; }
    .activity-hero { padding-block: 2.75rem; }
    .activity-hero .back-link { margin-bottom: var(--space-4); }
    .activity-hero h1 { margin-bottom: var(--space-4); font-size: 2.8rem; }
    .activity-hero .lede { margin-bottom: var(--space-4); }
    .activity-hero-image { display: none; }
    .activity-facts { margin-top: var(--space-4); }
    .quiz-stage { padding-block: 2.5rem 4rem; }
    .question-card { padding: var(--space-6); }
    .quiz-progress { top: 76px; grid-template-columns: 1fr; gap: var(--space-2); }
    .result-actions { align-items: stretch; flex-direction: column; }
    .result-actions .button, .result-actions .text-link { width: 100%; justify-content: center; }
    .footer-grid { grid-template-columns: 1fr; }
    .site-footer nav { flex-wrap: wrap; }
}

@media (max-width: 430px) {
    h1 { font-size: 2.65rem; }
    .brand { flex-basis: 220px; }
    .book-stage { min-height: 400px; }
    .chapter-tabs a { padding-left: 2rem; }
    .path-stop { grid-template-columns: 44px minmax(0, 1fr); }
    .path-stop img { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
    .book-cover, .reflection-lines { transform: none; }
}

@media print {
    .site-header, .site-footer, .activity-hero, .no-print { display: none !important; }
    body, .quiz-stage { background: white; }
    .section-pad { padding: 0; }
    .result-panel { box-shadow: none; border: 1px solid #999; }
    .certificate { break-before: page; }
}