:root {
	--navy-950: #061725;
	--navy-900: #071a2b;
	--navy-800: #102c42;
	--blue-600: #2479a9;
	--cyan-500: #24b8c7;
	--coral-500: #ff6b5f;
	--ink: #071a2b;
	--muted: #526477;
	--paper: #f5f8fc;
	--surface: #ffffff;
	--surface-cool: #e8eff6;
	--line: #ccd8e4;
	--aura-blue: rgba(36, 121, 169, .2);
	--aura-cyan: rgba(36, 184, 199, .2);
	--aura-coral: rgba(255, 107, 95, .13);
	--aura-gold: rgba(239, 181, 78, .1);
	--shadow-book: 0 34px 68px rgba(6, 23, 37, .25), 0 8px 18px rgba(6, 23, 37, .16);
	--shadow-panel: 0 18px 50px rgba(6, 23, 37, .08);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body { position: relative; isolation: isolate; margin: 0; color: var(--ink); background: var(--paper); font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.58; }

/* Le mouvement reste dans le décor : les couvertures, textes et actions gardent un plan parfaitement stable. */
body::before,
body::after {
	position: fixed;
	z-index: -1;
	content: "";
	pointer-events: none;
	will-change: transform;
}

body::before {
	top: -34rem;
	right: -28rem;
	width: clamp(52rem, 82vw, 76rem);
	aspect-ratio: 1;
	background:
		radial-gradient(ellipse at 28% 70%, var(--aura-blue) 0 12%, transparent 42%),
		radial-gradient(ellipse at 65% 28%, var(--aura-coral) 0 10%, transparent 40%),
		conic-gradient(from 198deg at 52% 48%, transparent 0 15%, var(--aura-cyan) 24%, transparent 35% 48%, var(--aura-gold) 59%, transparent 72% 100%);
	border-radius: 43% 57% 61% 39% / 54% 43% 57% 46%;
	-webkit-mask-image: radial-gradient(circle, #000 0 44%, rgba(0, 0, 0, .72) 58%, transparent 76%);
	mask-image: radial-gradient(circle, #000 0 44%, rgba(0, 0, 0, .72) 58%, transparent 76%);
	animation: books-aura-drift 30s cubic-bezier(.45, .05, .55, .95) infinite alternate;
}

body::after {
	bottom: -28rem;
	left: -23rem;
	width: clamp(44rem, 68vw, 64rem);
	aspect-ratio: 1;
	background:
		radial-gradient(ellipse at 64% 34%, var(--aura-blue) 0 9%, transparent 38%),
		conic-gradient(from 24deg at 48% 54%, transparent 0 26%, var(--aura-coral) 36%, transparent 48% 66%, var(--aura-cyan) 75%, transparent 88% 100%);
	border-radius: 62% 38% 46% 54% / 40% 55% 45% 60%;
	-webkit-mask-image: radial-gradient(circle, #000 0 38%, rgba(0, 0, 0, .68) 55%, transparent 74%);
	mask-image: radial-gradient(circle, #000 0 38%, rgba(0, 0, 0, .68) 55%, transparent 74%);
	animation: books-aura-drift-secondary 36s cubic-bezier(.45, .05, .55, .95) infinite alternate;
}

@keyframes books-aura-drift {
	0% { transform: translate3d(0, 0, 0) rotate(-8deg) scale(.96); }
	52% { transform: translate3d(-5vw, 4vh, 0) rotate(9deg) scale(1.04); }
	100% { transform: translate3d(-2vw, 9vh, 0) rotate(18deg) scale(.99); }
}

@keyframes books-aura-drift-secondary {
	0% { transform: translate3d(0, 0, 0) rotate(6deg) scale(.98); }
	55% { transform: translate3d(6vw, -5vh, 0) rotate(-9deg) scale(1.05); }
	100% { transform: translate3d(2vw, -10vh, 0) rotate(-17deg) scale(1); }
}

a { color: inherit; }
img { display: block; max-width: 100%; }
button, select, input, textarea { font: inherit; }

.books-header { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; width: min(100%, 1440px); margin: 0 auto; padding: 12px clamp(18px, 4.5vw, 68px); background: rgba(245, 248, 252, .94); border-bottom: 1px solid rgba(82, 100, 119, .22); backdrop-filter: blur(16px); }
.books-brand { display: flex; align-items: center; gap: 18px; text-decoration: none; }
.books-brand img { width: 154px; height: auto; }
.books-brand small { max-width: 170px; color: var(--muted); font-size: 10px; font-weight: 800; letter-spacing: .12em; line-height: 1.3; text-transform: uppercase; }
.books-header nav { display: flex; gap: 3px; padding: 3px; background: var(--surface-cool); border-radius: 10px; }
.books-header nav a { min-width: 38px; padding: 7px 9px; border-radius: 7px; color: var(--muted); font-size: 11px; font-weight: 850; text-align: center; text-decoration: none; }
.books-header nav a[aria-current="page"] { color: white; background: var(--navy-900); }

main { position: relative; z-index: 1; width: min(100%, 1440px); margin: 0 auto; padding: 0 clamp(18px, 4.5vw, 68px) 78px; }
.eyebrow { margin: 0 0 10px; color: var(--accent, var(--blue-600)); font-size: 11px; font-weight: 850; letter-spacing: .16em; text-transform: uppercase; }

.catalog-hero { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) 210px; gap: 72px; align-items: end; padding: 76px 0 58px; border-bottom: 1px solid var(--line); }
.catalog-hero::before { position: absolute; top: 28px; left: 0; width: 76px; height: 7px; content: ""; background: linear-gradient(90deg, var(--cyan-500) 0 72%, var(--coral-500) 72%); }
.catalog-hero h1 { max-width: 900px; margin: 6px 0 18px; font-family: Georgia, "Times New Roman", serif; font-size: clamp(42px, 5.2vw, 72px); font-weight: 500; line-height: 1.01; letter-spacing: -.038em; }
.catalog-hero p:not(.eyebrow) { max-width: 770px; margin: 0; color: var(--muted); font-size: clamp(17px, 1.7vw, 21px); }
.hero-orbit { justify-self: end; display: grid; width: 180px; min-height: 180px; align-content: center; padding: 24px; color: white; background: var(--navy-900); box-shadow: 14px 14px 0 var(--surface-cool); }
.hero-orbit span { font-family: Georgia, serif; font-size: 84px; line-height: .8; }
.hero-orbit small { margin-top: 18px; color: #b8c9d8; font-size: 10px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }

.books-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 46px; padding-top: 18px; }
.book-card { position: relative; display: grid; grid-template-columns: 178px minmax(0, 1fr); gap: 28px; align-items: center; min-height: 328px; padding: 34px 0; border-bottom: 1px solid var(--line); }
.book-card::after { position: absolute; top: 34px; right: 0; width: 4px; height: 58px; content: ""; background: var(--accent); }
.cover-frame { position: relative; align-self: center; transition: transform .25s ease; }
.cover-frame::before { position: absolute; inset: 12px -10px -12px 10px; z-index: -1; content: ""; background: color-mix(in srgb, var(--accent) 32%, var(--surface-cool)); }
.cover-frame:hover { transform: translateY(-4px) rotate(-.35deg); }
.cover-frame img { width: 100%; aspect-ratio: 5 / 8; object-fit: cover; background: var(--navy-900); box-shadow: var(--shadow-book); }
.book-card-copy { display: flex; min-width: 0; flex-direction: column; align-items: flex-start; }
.book-card h2 { margin: 0 22px 12px 0; font-family: Georgia, serif; font-size: clamp(26px, 2.65vw, 39px); font-weight: 500; line-height: 1.04; letter-spacing: -.025em; }
.book-card h2 a { text-decoration: none; }
.book-card-copy > p:not(.eyebrow) { margin: 0 0 18px; color: var(--muted); font-size: 15px; }
.availability { display: inline-flex; padding: 5px 9px; border: 1px solid var(--line); color: var(--muted); font-size: 10px; font-weight: 850; letter-spacing: .06em; text-transform: uppercase; }
.availability.is-available { color: #0b6047; background: #e3f5ef; border-color: #a8ddcd; }
.text-link { margin-top: 16px; color: var(--accent); font-size: 13px; font-weight: 850; text-decoration: none; }

.product-page { padding-top: 0; }
.product-hero { position: relative; display: grid; grid-template-columns: minmax(250px, 380px) minmax(0, 1fr); gap: clamp(48px, 7vw, 100px); align-items: center; min-height: 650px; padding: 58px 0 70px; }
.product-hero::after { position: absolute; right: 0; bottom: 0; left: 0; height: 1px; content: ""; background: linear-gradient(90deg, var(--accent) 0 15%, var(--line) 15%); }
.product-cover { position: relative; padding-left: 24px; perspective: 1000px; }
.product-cover::before { position: absolute; inset: 8% 8% -4% -5%; z-index: -1; content: ""; background: color-mix(in srgb, var(--accent) 25%, var(--surface-cool)); }
.product-cover::after { position: absolute; top: 0; bottom: 0; left: 8px; width: 5px; content: ""; background: var(--accent); }
.product-cover img { width: 100%; aspect-ratio: 5 / 8; object-fit: cover; background: var(--navy-900); box-shadow: var(--shadow-book); transform: rotateY(2deg); transform-origin: left center; }
.product-intro { max-width: 790px; }
.product-intro h1 { margin: 7px 0 20px; font-family: Georgia, serif; font-size: clamp(44px, 6vw, 78px); font-weight: 500; line-height: .99; letter-spacing: -.04em; }
.product-intro .lead { max-width: 760px; margin: 0 0 18px; color: var(--navy-800); font-size: clamp(20px, 2vw, 27px); line-height: 1.3; }
.product-intro > p:not(.eyebrow):not(.lead) { max-width: 720px; margin: 0; color: var(--muted); font-size: 16px; }
.format-line { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 25px 0 20px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; font-weight: 800; }

.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 12px 18px; border: 1px solid transparent; border-radius: 7px; font-weight: 850; text-align: center; text-decoration: none; cursor: pointer; transition: transform .18s ease, background .18s ease; }
.button:hover:not(:disabled) { transform: translateY(-2px); }
.button:focus-visible, select:focus-visible, input:focus-visible, textarea:focus-visible { outline: 3px solid color-mix(in srgb, var(--cyan-500) 55%, transparent); outline-offset: 3px; }
.button-primary { color: white; background: var(--navy-900); }
.button-primary:hover:not(:disabled) { background: var(--blue-600); }
.button-secondary { color: var(--navy-900); background: white; border-color: var(--line); }
.button:disabled { cursor: not-allowed; opacity: .48; }

.package-preview { display: grid; grid-template-columns: minmax(220px, .7fr) minmax(0, 1.3fr); gap: clamp(28px, 5vw, 70px); align-items: center; margin: 48px 0 0; padding: clamp(26px, 4vw, 48px); background: var(--surface); border-top: 6px solid var(--accent); box-shadow: var(--shadow-panel); }
.package-heading h2 { max-width: 520px; margin: 0; font-family: Georgia, serif; font-size: clamp(28px, 3.4vw, 44px); font-weight: 500; line-height: 1.08; }
.package-items { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.package-item { display: grid; grid-template-columns: 92px minmax(0, 1fr); gap: 16px; align-items: center; min-width: 0; padding: 14px; background: var(--paper); border: 1px solid var(--line); }
.package-item img { width: 92px; aspect-ratio: 5 / 8; object-fit: cover; box-shadow: 0 12px 24px rgba(6, 23, 37, .16); }
.package-item div { display: grid; gap: 8px; min-width: 0; }
.package-item strong { font-family: Georgia, serif; font-size: 18px; font-weight: 600; line-height: 1.15; }
.package-item span { color: var(--muted); font-size: 11px; font-weight: 800; line-height: 1.4; text-transform: uppercase; }

.value-grid { display: grid; grid-template-columns: .78fr 1.22fr; gap: 0; margin: 66px 0 28px; background: white; box-shadow: var(--shadow-panel); }
.value-copy, .benefit-panel { padding: clamp(30px, 4.4vw, 58px); }
.value-copy { color: white; background: var(--navy-900); border-top: 8px solid var(--accent); }
.value-copy .eyebrow { color: #b9cada; }
.value-copy h2, .benefit-panel h2, .excerpt-panel h2, .purchase-panel h2 { margin: 0; font-family: Georgia, serif; font-size: clamp(29px, 3.7vw, 48px); font-weight: 500; line-height: 1.08; }
.benefit-panel { border-top: 8px solid var(--surface-cool); }
.benefit-panel ul { display: grid; gap: 0; margin: 25px 0 0; padding: 0; list-style: none; }
.benefit-panel li { position: relative; padding: 13px 0 13px 30px; border-top: 1px solid var(--line); font-size: 16px; }
.benefit-panel li::before { position: absolute; top: 13px; left: 0; content: "→"; color: var(--accent); font-weight: 900; }

.book-ad-slot { width: 100%; height: 126px; min-height: 126px; max-height: 126px; margin: 26px auto; padding: 8px 0; overflow: hidden; border-block: 1px solid var(--line); }
.book-ad-slot > div { margin: 0 !important; }
.excerpt-panel { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 40px; align-items: center; margin-top: 26px; padding: clamp(28px, 4vw, 50px); color: white; background: var(--navy-800); border-left: 8px solid var(--accent); }
.excerpt-panel .eyebrow { color: #bdd0df; }
.excerpt-panel p:not(.eyebrow) { color: #d5e0e9; }
.updates-panel { display: grid; grid-template-columns: minmax(180px, .45fr) minmax(0, 1.55fr); gap: 28px; margin: 26px 0; padding: 24px 0; border-block: 1px solid var(--line); }
.updates-panel p { margin: 0; }
.updates-panel p:last-child { color: var(--muted); }

.purchase-panel { display: grid; grid-template-columns: minmax(260px, .72fr) minmax(480px, 1.28fr); gap: clamp(34px, 5vw, 70px); align-items: start; margin-top: 28px; padding: clamp(30px, 4.5vw, 58px); background: white; border-top: 8px solid var(--accent); box-shadow: var(--shadow-panel); }
.purchase-copy p:not(.eyebrow) { color: var(--muted); }
.offer-form { min-width: 0; }
.offer-choices { display: grid; gap: 10px; margin: 0; padding: 0; border: 0; }
.offer-choices legend { width: 100%; margin-bottom: 12px; color: var(--muted); font-size: 11px; font-weight: 850; letter-spacing: .14em; text-transform: uppercase; }
.offer-choice-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; align-items: stretch; }
.offer-choice { position: relative; display: grid; grid-template-columns: 22px minmax(0, 1fr) auto; gap: 13px; align-items: center; padding: 15px 16px; border: 1px solid var(--line); cursor: pointer; }
.offer-choice:has(input:checked) { background: #edf7fa; border-color: var(--cyan-500); box-shadow: inset 4px 0 0 var(--cyan-500); }
.offer-choice input { width: 17px; height: 17px; margin: 0; accent-color: var(--navy-900); }
.offer-choice-copy { display: grid; min-width: 0; gap: 2px; }
.offer-choice-copy strong { color: var(--navy-900); font-size: 14px; }
.offer-choice-copy small { overflow: hidden; color: var(--muted); font-size: 11px; line-height: 1.35; text-overflow: ellipsis; }
.offer-book-count { color: var(--blue-600); font-size: 12px; font-weight: 850; }
.offer-details-button { min-width: 104px; padding: 8px 12px; color: var(--blue-600); background: #f4f8fb; border: 1px solid var(--line); border-radius: 4px; font-size: 11px; font-weight: 850; cursor: pointer; }
.offer-details-button:hover, .offer-details-button:focus-visible { color: var(--navy-900); background: #e3f3f6; border-color: var(--cyan-500); }
.price-card { display: grid; gap: 12px; margin-top: 14px; padding: 22px; color: white; background: var(--navy-900); }
.price-card > p { margin: 0; color: #b7c9d8; font-size: 10px; font-weight: 850; letter-spacing: .12em; text-transform: uppercase; }
.price-line { display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px; }
.price-line del { color: #a8bac9; font-size: 18px; }
.price-line strong { font-family: Georgia, serif; font-size: 42px; font-weight: 500; line-height: 1; }
.pack-saving { color: #7ee0d2; font-size: 12px; font-weight: 800; }
.currency-field { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 12px; color: #d1dee8; font-size: 12px; font-weight: 800; }
.currency-field select { min-width: 105px; padding: 9px 28px 9px 11px; border: 1px solid #456176; border-radius: 5px; color: white; background: var(--navy-800); }
.currency-help { color: #9fb3c4; font-size: 11px; line-height: 1.4; }
.checkout-email-field { display: grid; gap: 7px; padding-top: 12px; border-top: 1px solid #345066; color: #dce7ef; font-size: 12px; font-weight: 800; }
.checkout-email-field input { width: 100%; box-sizing: border-box; padding: 11px 12px; border: 1px solid #577288; border-radius: 5px; color: var(--navy-900); background: #fff; font: inherit; }
.checkout-email-field input:focus { outline: 3px solid rgba(50, 194, 205, .3); border-color: var(--cyan-500); }
.checkout-email-field small, .consent-privacy { color: #b7c9d8; font-size: 10px; font-weight: 500; line-height: 1.45; }
.checkout-consents { display: grid; gap: 10px; }
.updates-consent { display: grid; grid-template-columns: 18px 1fr; gap: 10px; align-items: start; padding-top: 12px; border-top: 1px solid #345066; color: #dce7ef; font-size: 11px; line-height: 1.45; }
.checkout-consents .updates-consent { padding-top: 0; border-top: 0; }
.checkout-consents .updates-consent.is-required { padding-top: 12px; border-top: 1px solid #345066; }
.updates-consent input { width: 16px; height: 16px; margin: 2px 0 0; accent-color: var(--cyan-500); }
.price-card .button-primary { color: var(--navy-900); background: var(--cyan-500); }
.price-card .button-primary:hover:not(:disabled) { background: #54d3de; }
.price-card .availability { color: #b7c9d8; border-color: #456176; }

.message-panel { min-height: 70vh; padding: 100px 0; text-align: center; }
.message-panel h1 { margin: 0 0 18px; font-family: Georgia, serif; font-size: clamp(42px, 6vw, 70px); font-weight: 500; }
.purchase-confirmation { display: grid; width: min(100%, 980px); margin: 0 auto; align-content: center; justify-items: stretch; }
.purchase-confirmation > .eyebrow, .purchase-confirmation > h1 { width: 100%; text-align: center; }
.entitlement-list { display: grid; width: 100%; gap: 12px; margin-top: 28px; text-align: left; }
.entitlement-item { display: grid; grid-template-columns: 118px minmax(0, 1fr); gap: 24px; align-items: center; padding: 18px 24px; background: white; border-left: 5px solid var(--cyan-500); box-shadow: var(--shadow-panel); }
.entitlement-cover { width: 118px; aspect-ratio: 5 / 8; object-fit: cover; box-shadow: 0 8px 18px rgba(6, 23, 37, .18); }
.entitlement-content { display: grid; min-width: 0; gap: 12px; }
.entitlement-copy { min-width: 0; }
.entitlement-copy .eyebrow { margin-bottom: 5px; }
.entitlement-item h2 { margin: 0; font-family: Georgia, serif; font-size: 22px; font-weight: 500; }
.download-prompt { margin: 6px 0 0; color: var(--muted); font-size: 12px; line-height: 1.4; }
.download-actions { display: flex; flex-wrap: wrap; justify-content: flex-start; gap: 8px; }
.download-actions .button { min-height: 40px; padding: 8px 13px; font-size: 12px; }

.books-footer { display: flex; justify-content: space-between; gap: 20px; width: min(100%, 1440px); margin: 0 auto; padding: 28px clamp(18px, 4.5vw, 68px); color: var(--muted); border-top: 1px solid var(--line); font-size: 12px; }
.books-footer a { color: var(--ink); font-weight: 800; text-decoration: none; }
.books-footer .legal-link { color: var(--muted); font-weight: 600; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 18px; }
.confirmation-help { margin: -52px auto 54px; text-align: center; }
.confirmation-help a { color: var(--blue-600); font-weight: 800; }
.contact-panel { display: grid; grid-template-columns: minmax(230px, .65fr) minmax(0, 1.35fr); gap: clamp(34px, 6vw, 80px); margin: 62px 0; padding: clamp(28px, 4.5vw, 58px); background: var(--surface); border-top: 7px solid var(--cyan-500); box-shadow: var(--shadow-panel); }
.contact-panel h1 { margin: 5px 0 18px; font-family: Georgia, serif; font-size: clamp(36px, 5vw, 62px); font-weight: 500; line-height: 1.02; letter-spacing: -.035em; }
.contact-panel .lead { color: var(--muted); font-size: 16px; }
.contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-field { display: grid; gap: 6px; color: var(--navy-800); font-size: 12px; font-weight: 800; }
.contact-field.is-wide { grid-column: 1 / -1; }
.contact-field input, .contact-field select, .contact-field textarea { width: 100%; padding: 12px 13px; border: 1px solid var(--line); border-radius: 5px; color: var(--ink); background: var(--paper); }
.contact-field textarea { min-height: 160px; resize: vertical; }
.contact-form .button { grid-column: 1 / -1; justify-self: start; }
.contact-notice { grid-column: 1 / -1; margin: 0; padding: 12px 14px; color: #0b6047; background: #e3f5ef; border-left: 4px solid #33a481; }
.contact-notice.is-error { color: #8a2924; background: #fff0ef; border-left-color: var(--coral-500); }
.contact-honeypot { position: absolute !important; left: -9999px !important; }
.pack-dialog { width: min(920px, calc(100vw - 32px)); max-height: min(780px, calc(100vh - 32px)); padding: 0; color: var(--ink); background: #fff; border: 0; border-radius: 8px; box-shadow: 0 28px 80px rgba(4, 25, 42, .38); }
.pack-dialog::backdrop { background: rgba(5, 23, 37, .72); backdrop-filter: blur(3px); }
.pack-dialog-shell { position: relative; padding: clamp(24px, 4vw, 46px); }
.pack-dialog-close { position: absolute; top: 14px; right: 16px; display: grid; width: 38px; height: 38px; place-items: center; color: var(--navy-900); background: #eef3f6; border: 0; border-radius: 50%; font-size: 26px; line-height: 1; cursor: pointer; }
.pack-dialog-content h2 { max-width: 720px; margin: 5px 46px 8px 0; font-family: Georgia, serif; font-size: clamp(30px, 4vw, 46px); font-weight: 500; line-height: 1.04; }
.pack-dialog-intro { max-width: 720px; margin: 0 0 24px; color: var(--muted); }
.pack-book-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-bottom: 26px; }
.pack-book-item { display: grid; grid-template-columns: 64px minmax(0, 1fr); gap: 14px; align-items: center; min-width: 0; padding: 12px; background: #f5f8fa; border-left: 3px solid var(--cyan-500); }
.pack-book-item img { width: 64px; aspect-ratio: 2 / 3; object-fit: cover; box-shadow: 0 7px 15px rgba(6, 29, 47, .18); }
.pack-book-item div { display: grid; min-width: 0; gap: 5px; }
.pack-book-item strong { color: var(--navy-900); font-size: 13px; line-height: 1.25; }
.pack-book-item span { color: var(--muted); font-size: 10px; line-height: 1.35; }
.sticky-purchase-bar { position: fixed; z-index: 90; right: 0; bottom: 0; left: 0; padding: 11px max(18px, env(safe-area-inset-right)) max(11px, env(safe-area-inset-bottom)) max(18px, env(safe-area-inset-left)); background: rgba(255, 255, 255, .97); border-top: 1px solid var(--line); box-shadow: 0 -12px 32px rgba(4, 25, 42, .13); backdrop-filter: blur(8px); transition: opacity .18s ease, transform .18s ease; }
.sticky-purchase-inner { display: flex; width: min(100%, 1180px); margin: 0 auto; align-items: center; justify-content: center; }
.sticky-purchase-cta { display: inline-flex; flex: 0 0 auto; min-height: 48px; padding: 11px 34px; align-items: center; justify-content: center; color: #fff; background: var(--navy-900); border: 2px solid var(--navy-900); border-radius: 5px; box-shadow: 0 7px 18px rgba(4, 25, 42, .2); font-size: 16px; font-weight: 900; letter-spacing: .02em; text-decoration: none; }
.sticky-purchase-cta:hover { color: #fff; background: var(--blue-600); border-color: var(--blue-600); }
.sticky-purchase-bar.is-hidden { pointer-events: none; opacity: 0; transform: translateY(100%); }

@media (max-width: 980px) {
	.catalog-hero { grid-template-columns: 1fr 160px; gap: 32px; }
	.hero-orbit { width: 150px; min-height: 150px; }
	.hero-orbit span { font-size: 66px; }
	.books-grid { grid-template-columns: 1fr; }
	.book-card { grid-template-columns: 170px 1fr; }
	.product-hero { grid-template-columns: minmax(230px, 320px) 1fr; gap: 46px; min-height: 580px; }
	.package-preview { grid-template-columns: 1fr; }
	.value-grid { grid-template-columns: 1fr; }
	.purchase-panel { grid-template-columns: 1fr; }
	.purchase-copy { max-width: 700px; }
	.contact-panel { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
	.books-brand img { width: 132px; }
	.books-brand small { display: none; }
	.catalog-hero { grid-template-columns: 1fr; padding-top: 68px; }
	.hero-orbit { display: none; }
	.product-hero { grid-template-columns: 1fr; gap: 42px; min-height: 0; padding-top: 40px; }
	.product-cover { width: min(72vw, 310px); margin: 0 auto; }
	.product-intro { max-width: 660px; }
	.package-items { grid-template-columns: 1fr 1fr; }
	.excerpt-panel, .updates-panel { grid-template-columns: 1fr; }
	.entitlement-item { grid-template-columns: 96px minmax(0, 1fr); }
	.entitlement-cover { width: 96px; }
	.entitlement-content { grid-column: 2; }
	.entitlement-item .download-actions { justify-content: flex-start; }
}

@media (max-width: 520px) {
	body::before { opacity: .82; animation-duration: 40s; }
	body::after { display: none; }
	.books-header { padding: 10px 14px; }
	.books-brand img { width: 118px; }
	.books-header nav a { min-width: 34px; padding-inline: 7px; }
	main { padding-inline: 14px; padding-bottom: 54px; }
	.catalog-hero { padding-bottom: 40px; }
	.catalog-hero h1 { font-size: 39px; }
	.books-grid { padding-top: 0; }
	.book-card { grid-template-columns: 108px minmax(0, 1fr); gap: 17px; min-height: 0; padding: 26px 0; }
	.book-card::after { top: 26px; width: 3px; height: 40px; }
	.book-card h2 { margin-right: 12px; font-size: 24px; }
	.book-card-copy > p:not(.eyebrow) { display: none; }
	.book-card .availability { font-size: 8px; }
	.product-cover { width: min(76vw, 280px); }
	.product-intro h1 { font-size: 42px; }
	.product-intro .lead { font-size: 19px; }
	.value-grid { margin-top: 46px; }
	.value-copy, .benefit-panel, .excerpt-panel, .purchase-panel { padding: 26px 20px; }
	.package-preview { padding: 26px 20px; }
	.package-items { grid-template-columns: 1fr; }
	.book-ad-slot { height: 110px; min-height: 110px; max-height: 110px; }
	.offer-choice { grid-template-columns: 20px minmax(0, 1fr) auto; padding: 13px 12px; }
	.offer-choice-row { grid-template-columns: minmax(0, 1fr); gap: 5px; }
	.offer-details-button { min-height: 38px; }
	.offer-choice-copy small { display: none; }
	.price-card { padding: 18px; }
	.price-line strong { font-size: 37px; }
	.books-footer { flex-direction: column; padding-inline: 14px; }
	.footer-links { justify-content: flex-start; }
	.contact-form { grid-template-columns: 1fr; }
	.contact-field, .contact-field.is-wide { grid-column: 1; }
	.pack-dialog { width: calc(100vw - 20px); max-height: calc(100vh - 20px); }
	.pack-dialog-shell { padding: 24px 18px; }
	.pack-book-list { grid-template-columns: 1fr; }
	.pack-book-item { grid-template-columns: 52px minmax(0, 1fr); padding: 10px; }
	.pack-book-item img { width: 52px; }
	.sticky-purchase-bar { padding: 9px 14px max(9px, env(safe-area-inset-bottom)); }
	.sticky-purchase-cta { min-height: 46px; padding-inline: 24px; font-size: 15px; }
}

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