@font-face {
  font-family: "Cobe";
  src: url("assets/fonts/Cobe-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Cobe";
  src: url("assets/fonts/Cobe-Medium.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Cobe";
  src: url("assets/fonts/Cobe-Bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Cobe";
  src: url("assets/fonts/Cobe-Heavy.woff2") format("woff2");
  font-weight: 900;
  font-style: normal;
  font-display: swap;
}

:root {
  --ink: #f3f8ff;
  --muted: #9ab6da;
  --paper: #eef7ff;
  --night: #040b18;
  --navy: #07152c;
  --blue: #0b54d8;
  --blue-2: #22b9ff;
  --aqua: #8de8ff;
  --gold: #d7ac55;
  --gold-2: #fff0b7;
  --gold-dark: #8b6425;
  --steel: #6d87a8;
  --line: rgba(142, 205, 255, 0.26);
  --line-strong: rgba(122, 207, 255, 0.45);
  --shadow: 0 24px 80px rgba(0, 16, 52, 0.55);
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Cobe", Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 74% 4%, rgba(34, 185, 255, 0.26), transparent 32rem),
    radial-gradient(circle at 8% 36%, rgba(11, 84, 216, 0.28), transparent 28rem),
    linear-gradient(180deg, #020712 0%, #061228 48%, #edf7ff 48%, #edf7ff 100%);
  min-width: 320px;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(rgba(141, 232, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(141, 232, 255, 0.03) 1px, transparent 1px);
  background-size: 54px 54px;
  mask-image: linear-gradient(180deg, black, transparent 82%);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
select {
  font: inherit;
}

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

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 20;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  color: #00142e;
  background: var(--aqua);
  transform: translateY(-150%);
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: fixed;
  top: 1rem;
  left: 50%;
  z-index: 10;
  width: min(1180px, calc(100% - 2rem));
  transform: translateX(-50%);
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1rem;
  align-items: center;
  height: 4rem;
  min-height: 4rem;
  padding: 0.55rem 0.7rem;
  overflow: hidden;
  border: 1px solid rgba(173, 226, 255, 0.24);
  border-radius: 0.55rem;
  background: rgba(4, 11, 24, 0.74);
  box-shadow: 0 18px 58px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  max-width: 13rem;
  overflow: hidden;
  font-weight: 900;
  letter-spacing: 0;
}

.brand-logo {
  display: block;
  flex: 0 0 auto;
  width: 2.55rem;
  height: 2.55rem;
  object-fit: contain;
}

.brand-fallback {
  color: #f6f0df;
  font-size: clamp(1.05rem, 1.7vw, 1.35rem);
  font-weight: 900;
}

.nav-links {
  display: flex;
  justify-content: center;
  gap: clamp(0.7rem, 2vw, 2rem);
  color: #dceeff;
  font-size: 0.95rem;
}

.nav-links a,
.header-action {
  padding: 0.75rem 0.65rem;
  border-radius: 0.45rem;
}

.nav-links a:focus-visible,
.nav-links a:hover,
.header-action:focus-visible,
.header-action:hover {
  outline: none;
  background: rgba(141, 232, 255, 0.12);
}

.header-action {
  border: 1px solid rgba(141, 232, 255, 0.3);
  color: var(--aqua);
  white-space: nowrap;
}

.hero {
  position: relative;
  isolation: isolate;
  min-height: 100svh;
  overflow: hidden;
  background: #030816;
}

.hero-image {
  position: absolute;
  inset: 0;
  z-index: -3;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-scrim {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(2, 7, 18, 0.96) 0%, rgba(3, 10, 24, 0.78) 39%, rgba(4, 12, 26, 0.22) 68%, rgba(4, 12, 26, 0.46) 100%),
    linear-gradient(180deg, rgba(2, 7, 18, 0.15) 0%, rgba(2, 7, 18, 0.22) 54%, #061228 100%);
}

.hero-grid {
  width: min(1180px, calc(100% - 2rem));
  min-height: 100svh;
  margin: 0 auto;
  padding: clamp(7.5rem, 13vw, 11rem) 0 4rem;
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(18rem, 0.38fr);
  align-items: end;
  gap: clamp(2rem, 5vw, 5rem);
}

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--aqua);
  font-size: 0.82rem;
  font-weight: 900;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 1.25rem;
  font-size: clamp(2.65rem, 5.9vw, 5.9rem);
  line-height: 0.92;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h2 {
  margin-bottom: 0.85rem;
  font-size: clamp(2rem, 4.6vw, 4.8rem);
  line-height: 0.95;
  letter-spacing: 0;
}

h3 {
  font-size: clamp(1.15rem, 2vw, 1.55rem);
  line-height: 1.05;
}

.hero-lede {
  max-width: 620px;
  color: #c6dbf2;
  font-size: clamp(1rem, 1.45vw, 1.2rem);
  line-height: 1.52;
}

.hero-actions,
.course-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  align-items: center;
  margin-top: 1.45rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.15rem;
  padding: 0.95rem 1.15rem;
  border: 1px solid transparent;
  border-radius: 0.5rem;
  font-weight: 900;
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease), background 220ms var(--ease);
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-2px);
  outline: none;
}

.btn-primary {
  color: #031126;
  background: linear-gradient(135deg, #f8fcff 0%, var(--aqua) 45%, var(--blue-2) 100%);
  box-shadow: 0 18px 46px rgba(34, 185, 255, 0.26);
}

.btn-gold {
  color: #120d04;
  background: linear-gradient(135deg, #fff7d7 0%, var(--gold-2) 28%, var(--gold) 72%, #b7802d 100%);
  box-shadow: 0 18px 46px rgba(215, 172, 85, 0.26);
}

.btn-secondary {
  color: var(--ink);
  border-color: rgba(141, 232, 255, 0.44);
  background: rgba(141, 232, 255, 0.1);
}

.btn-ghost {
  color: #d9ecff;
  border-color: rgba(154, 182, 218, 0.32);
}

.hero-panel {
  align-self: end;
  display: grid;
  gap: 1rem;
  padding: 1rem;
  border: 1px solid rgba(141, 232, 255, 0.28);
  border-radius: 0.55rem;
  background: rgba(3, 13, 30, 0.62);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero-panel > div {
  padding: 1rem;
  border: 1px solid rgba(141, 232, 255, 0.16);
  border-radius: 0.45rem;
  background: linear-gradient(135deg, rgba(141, 232, 255, 0.1), rgba(8, 29, 62, 0.36));
}

.panel-kicker,
.lesson-number {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.hero-panel strong {
  font-size: 1.45rem;
  line-height: 1;
}

.course-band {
  padding: clamp(5rem, 9vw, 8rem) max(1rem, calc((100% - 1180px) / 2));
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(10, 31, 71, 0.92), rgba(2, 9, 23, 0.96)),
    repeating-linear-gradient(135deg, rgba(141, 232, 255, 0.08) 0 1px, transparent 1px 14px);
}

.section-heading {
  max-width: 760px;
  padding: 0 1rem;
}

.course-rail {
  display: grid;
  grid-template-columns: repeat(5, minmax(15rem, 1fr));
  gap: 1px;
  margin-top: 2.3rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--line);
  scroll-snap-type: x proximity;
}

.course-access {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.45fr);
  gap: clamp(1rem, 3vw, 3rem);
  align-items: center;
  margin: 2.2rem 1rem 0;
  padding: clamp(1.2rem, 3vw, 2rem);
  border: 1px solid rgba(141, 232, 255, 0.28);
  border-radius: 0.55rem;
  background:
    linear-gradient(135deg, rgba(141, 232, 255, 0.13), rgba(5, 20, 45, 0.76)),
    radial-gradient(circle at 90% 10%, rgba(34, 185, 255, 0.24), transparent 16rem);
  box-shadow: 0 24px 70px rgba(0, 18, 52, 0.38);
}

.course-access-copy h3 {
  max-width: 720px;
  margin-bottom: 0.8rem;
  font-size: clamp(1.7rem, 3.8vw, 3.4rem);
}

.course-access-copy p {
  max-width: 680px;
  margin-bottom: 0;
  color: #c6dbf2;
  font-size: clamp(1rem, 1.6vw, 1.18rem);
  line-height: 1.55;
}

.course-link-grid {
  display: grid;
  gap: 0.7rem;
}

.course-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.8rem 1rem;
  border: 1px solid rgba(141, 232, 255, 0.28);
  border-radius: 0.48rem;
  color: #dceeff;
  font-weight: 900;
  background: rgba(141, 232, 255, 0.1);
  transition: transform 220ms var(--ease), background 220ms var(--ease), border-color 220ms var(--ease);
}

.course-link:hover,
.course-link:focus-visible {
  transform: translateY(-2px);
  outline: none;
  border-color: rgba(141, 232, 255, 0.62);
  background: rgba(141, 232, 255, 0.18);
}

.course-link.primary {
  color: #031126;
  border-color: transparent;
  background: linear-gradient(135deg, #ffffff, var(--aqua) 50%, var(--blue-2));
}

.course-link.support {
  color: var(--aqua);
}

.lesson-card {
  min-height: 16rem;
  padding: 1.4rem;
  background:
    linear-gradient(180deg, rgba(12, 38, 82, 0.96), rgba(5, 17, 39, 0.98)),
    radial-gradient(circle at top right, rgba(34, 185, 255, 0.2), transparent 14rem);
  scroll-snap-align: start;
}

.lesson-card h3 {
  margin-bottom: 0.7rem;
}

.lesson-card p,
.reader-intro p,
.faq-item p {
  color: #bfd5ec;
  line-height: 1.65;
}

.course-cta {
  padding: 0 1rem;
}

.reader-section {
  display: grid;
  grid-template-columns: minmax(18rem, 0.42fr) minmax(0, 0.72fr);
  gap: clamp(1.4rem, 4vw, 4rem);
  align-items: start;
  padding: clamp(5rem, 9vw, 8rem) max(1rem, calc((100% - 1180px) / 2));
  color: #061228;
  background:
    radial-gradient(circle at 86% 12%, rgba(34, 185, 255, 0.18), transparent 22rem),
    linear-gradient(180deg, #edf7ff, #d9edff);
}

.reader-intro {
  position: sticky;
  top: 7rem;
  padding: 0 1rem;
}

.reader-intro .eyebrow {
  color: #0753b5;
}

.reader-intro h2 {
  font-size: clamp(2.15rem, 3.7vw, 4.05rem);
  text-transform: uppercase;
}

.reader-intro p {
  color: #405c78;
  font-size: 1.05rem;
  line-height: 1.6;
}

.reader-intro-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.65rem;
  margin-top: 1.15rem;
  max-width: 19rem;
}

.reader-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.8rem 1rem;
  border: 1px solid transparent;
  border-radius: 0.48rem;
  font-weight: 900;
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease), background 220ms var(--ease);
}

.reader-cta:hover,
.reader-cta:focus-visible {
  transform: translateY(-2px);
  outline: none;
}

.reader-cta.primary {
  color: #031126;
  background: linear-gradient(135deg, #ffffff, var(--aqua) 54%, var(--blue-2));
  box-shadow: 0 16px 36px rgba(34, 185, 255, 0.22);
}

.reader-cta.secondary {
  color: #0753b5;
  border-color: rgba(7, 83, 181, 0.22);
  background: rgba(255, 255, 255, 0.48);
}

.reader-shell {
  --reader-bg: #081224;
  --reader-page: #f8fcff;
  --reader-ink: #061228;
  --reader-muted: #607b9a;
  overflow: hidden;
  border: 1px solid rgba(6, 34, 74, 0.16);
  border-radius: 0.55rem;
  background: var(--reader-bg);
  box-shadow: 0 24px 70px rgba(4, 31, 78, 0.23);
}

.reader-shell[data-theme="paper"] {
  --reader-bg: #cfe4f7;
  --reader-page: #fbf7ec;
  --reader-ink: #102037;
  --reader-muted: #6b5f4d;
}

.reader-toolbar {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem;
  border-bottom: 1px solid rgba(190, 224, 255, 0.16);
}

.chapter-select {
  display: grid;
  gap: 0.3rem;
  min-width: min(19rem, 52vw);
  color: #dceeff;
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.chapter-select select {
  min-height: 2.65rem;
  padding: 0 0.8rem;
  border: 1px solid rgba(141, 232, 255, 0.24);
  border-radius: 0.45rem;
  color: #f3f8ff;
  background: #0f2547;
}

.reader-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: flex-end;
}

.tool-button,
.page-button {
  min-height: 2.65rem;
  border: 1px solid rgba(141, 232, 255, 0.24);
  border-radius: 0.45rem;
  color: #f3f8ff;
  background: rgba(141, 232, 255, 0.1);
  cursor: pointer;
}

.tool-button {
  padding: 0 0.75rem;
}

.tool-button:hover,
.tool-button:focus-visible,
.page-button:hover,
.page-button:focus-visible {
  outline: none;
  border-color: rgba(141, 232, 255, 0.6);
  background: rgba(141, 232, 255, 0.18);
}

.tool-button[aria-pressed="true"] {
  color: #031126;
  background: var(--aqua);
}

.reader-progress {
  height: 0.35rem;
  background: rgba(214, 236, 255, 0.16);
}

.reader-progress span {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--blue-2), var(--aqua));
  transition: width 240ms var(--ease);
}

.book-page {
  min-height: clamp(29rem, 62vw, 46rem);
  margin: clamp(0.75rem, 2vw, 1.3rem);
  padding: clamp(1.35rem, 4vw, 3rem);
  border-radius: 0.45rem;
  color: var(--reader-ink);
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.08), transparent 2.5rem),
    var(--reader-page);
  box-shadow: inset 16px 0 40px rgba(6, 18, 40, 0.08);
}

.pdf-book-page {
  display: grid;
  grid-template-rows: auto minmax(30rem, 1fr);
  gap: 0.9rem;
  padding: clamp(0.8rem, 2vw, 1.25rem);
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.08), transparent 2.5rem),
    #eaf6ff;
}

.pdf-meta {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  color: #607b9a;
}

.pdf-meta .book-overline {
  margin-bottom: 0;
}

#zoomStatus {
  padding: 0.35rem 0.55rem;
  border-radius: 0.4rem;
  color: #034ea8;
  font-size: 0.78rem;
  font-weight: 900;
  background: rgba(7, 83, 181, 0.08);
}

.pdf-canvas-wrap {
  position: relative;
  display: grid;
  place-items: start center;
  min-height: clamp(29rem, 58vw, 44rem);
  overflow: auto;
  padding: 0.75rem;
  border-radius: 0.35rem;
  background: #ffffff;
  box-shadow: inset 0 0 0 1px rgba(6, 34, 74, 0.1);
}

.pdf-canvas {
  max-width: none;
  background: #ffffff;
  box-shadow: 0 18px 44px rgba(6, 34, 74, 0.14);
}

.pdf-loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  margin: 0;
  padding: 1rem;
  color: #405c78;
  text-align: center;
  background: rgba(255, 255, 255, 0.82);
}

.pdf-loading[hidden] {
  display: none;
}

.book-page.is-turning {
  animation: pageTurn 260ms var(--ease);
}

.book-overline {
  margin-bottom: 0.9rem;
  color: var(--reader-muted);
  font-size: 0.8rem;
  font-weight: 900;
  text-transform: uppercase;
}

.book-page h3 {
  margin-bottom: 1.2rem;
  color: var(--reader-ink);
  font-size: clamp(1.75rem, 4vw, 3rem);
}

.book-content {
  font-size: var(--book-size, 1.12rem);
  line-height: 1.75;
}

.book-content p {
  margin-bottom: 1rem;
}

.book-content ul {
  display: grid;
  gap: 0.55rem;
  margin: 0 0 1rem;
  padding-left: 1.2rem;
}

.book-content strong {
  color: #034ea8;
}

.reader-footer {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 0.85rem;
  color: #dceeff;
  border-top: 1px solid rgba(190, 224, 255, 0.16);
}

.page-button {
  padding: 0 1rem;
}

.page-button:disabled {
  opacity: 0.42;
  cursor: not-allowed;
}

#pageStatus {
  text-align: center;
  color: #adc9e7;
}

.faq {
  padding: clamp(5rem, 9vw, 7rem) max(1rem, calc((100% - 1180px) / 2));
  color: var(--ink);
  background:
    radial-gradient(circle at 16% 20%, rgba(255, 218, 134, 0.24), transparent 18rem),
    radial-gradient(circle at 86% 72%, rgba(139, 100, 37, 0.3), transparent 24rem),
    linear-gradient(135deg, #070910 0%, #13141a 54%, #080a10 100%);
}

.final-cta-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.42fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: end;
  margin: 0 1rem;
  padding: clamp(1.5rem, 4vw, 3rem);
  border: 1px solid rgba(255, 218, 134, 0.34);
  border-radius: 0.55rem;
  background:
    linear-gradient(135deg, rgba(255, 218, 134, 0.18), rgba(21, 16, 8, 0.9)),
    repeating-linear-gradient(135deg, rgba(255, 218, 134, 0.08) 0 1px, transparent 1px 13px);
  box-shadow: 0 28px 90px rgba(61, 38, 8, 0.52);
}

.final-cta-copy {
  max-width: 760px;
}

.final-cta-copy .eyebrow {
  color: var(--gold-2);
}

.final-cta-copy h2 {
  margin-bottom: 1rem;
}

.final-cta-copy p {
  max-width: 620px;
  margin-bottom: 0;
  color: #f0dfbd;
  font-size: clamp(1.05rem, 1.8vw, 1.35rem);
  line-height: 1.55;
}

.final-cta-actions {
  display: grid;
  gap: 0.8rem;
}

.final-cta-actions .btn {
  width: 100%;
}

.final-cta-actions span {
  color: #d8c69d;
  font-size: 0.9rem;
  line-height: 1.45;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 1.2rem 1rem 0;
  background: rgba(255, 218, 134, 0.24);
}

.faq-item {
  min-height: 10rem;
  padding: 1.4rem;
  background: rgba(13, 14, 19, 0.9);
}

.faq-item h3 {
  color: #fff7df;
}

.faq-item p {
  color: #d6c6a4;
}

.site-footer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: clamp(1rem, 3vw, 2rem);
  align-items: center;
  padding: clamp(1.25rem, 3vw, 2rem) max(1rem, calc((100% - 1180px) / 2));
  color: #d8c69d;
  border-top: 1px solid rgba(255, 218, 134, 0.14);
  background:
    radial-gradient(circle at 12% 0%, rgba(215, 172, 85, 0.14), transparent 20rem),
    #03050b;
}

.footer-brand {
  display: flex;
  gap: 1rem;
  align-items: center;
  min-width: 0;
  padding: 0 1rem;
}

.footer-logo-lockup {
  display: grid;
  place-items: center;
  min-width: 8.5rem;
  min-height: 3rem;
}

.footer-logo {
  width: clamp(8.5rem, 16vw, 12.5rem);
  max-height: 3.5rem;
  object-fit: contain;
}

.footer-brand-fallback {
  color: #f6f0df;
  font-size: clamp(1.2rem, 2.2vw, 1.7rem);
  font-weight: 900;
}

.footer-brand p {
  max-width: 34rem;
  margin: 0;
  color: #b7a780;
  line-height: 1.5;
}

.footer-support {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.75rem 1.05rem;
  border: 1px solid rgba(255, 218, 134, 0.32);
  border-radius: 0.45rem;
  color: #fff0b7;
  font-weight: 900;
  background: rgba(215, 172, 85, 0.08);
  transition: transform 220ms var(--ease), background 220ms var(--ease), border-color 220ms var(--ease);
}

.footer-support:hover,
.footer-support:focus-visible {
  transform: translateY(-2px);
  outline: none;
  border-color: rgba(255, 218, 134, 0.58);
  background: rgba(215, 172, 85, 0.14);
}

.footer-age-seal {
  width: clamp(8.75rem, 18vw, 13.5rem);
  height: auto;
  margin: 0 1rem;
  filter: drop-shadow(0 0 20px rgba(215, 172, 85, 0.18));
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 560ms var(--ease), transform 560ms var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes pageTurn {
  from {
    opacity: 0;
    transform: translateX(12px) rotateY(-4deg);
  }
  to {
    opacity: 1;
    transform: translateX(0) rotateY(0);
  }
}

@media (max-width: 940px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav-links {
    display: none;
  }

  .hero-grid,
  .reader-section,
  .course-access,
  .final-cta-card {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    align-items: end;
  }

  .hero-panel {
    max-width: 420px;
  }

  .reader-intro {
    position: static;
  }

  .faq-grid {
    grid-template-columns: 1fr;
  }

}

@media (max-width: 640px) {
  .site-header {
    top: 0.65rem;
    width: calc(100% - 1rem);
    height: 3.5rem;
    min-height: 3.5rem;
  }

  .brand {
    gap: 0.5rem;
    font-size: 0.95rem;
  }

  .brand-logo {
    width: 2.2rem;
    height: 2.2rem;
  }

  .header-action {
    padding: 0.65rem 0.55rem;
    font-size: 0.9rem;
  }

  .hero {
    min-height: 92svh;
  }

  .hero-image {
    object-position: 63% center;
  }

  .hero-grid {
    min-height: 92svh;
    padding-top: 6.5rem;
  }

  .hero-actions,
  .course-cta {
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .course-rail {
    margin-left: 1rem;
    margin-right: 1rem;
  }

  .reader-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .chapter-select {
    min-width: 100%;
  }

  .reader-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
  }

  .tool-button {
    padding: 0 0.35rem;
  }

  .book-page {
    min-height: 32rem;
  }

  .pdf-book-page {
    grid-template-rows: auto minmax(34rem, 1fr);
  }

  .pdf-canvas-wrap {
    min-height: 34rem;
  }

  .reader-footer {
    grid-template-columns: 1fr;
  }

  .page-button {
    width: 100%;
  }

  .site-footer {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }

  .footer-brand {
    flex-direction: column;
    padding: 0;
  }

  .footer-support {
    width: min(100%, 18rem);
  }

  .footer-age-seal {
    margin: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}