:root {
  --bg-deep: #07233a;
  --bg-mid: #0d4b68;
  --bg-light: #dff3f8;
  --cyan: #7ce2ef;
  --foam: #eefcff;
  --sand: #f5e2b8;
  --gold: #ffcf7a;
  --ink: #102133;
  --ink-soft: #365066;
  --card: rgba(255, 255, 255, 0.12);
  --card-border: rgba(255, 255, 255, 0.22);
  --shadow: 0 28px 80px rgba(5, 18, 34, 0.2);
  --radius-lg: 36px;
  --radius-md: 26px;
  --radius-sm: 18px;
  --content-width: min(1120px, calc(100vw - 32px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Manrope", "PingFang TC", "Microsoft JhengHei", sans-serif;
  background:
    radial-gradient(circle at 20% 0%, rgba(124, 226, 239, 0.2), transparent 22%),
    linear-gradient(180deg, #041a2e 0%, #0b4062 24%, #1387a1 54%, #dff4f7 100%);
  min-height: 100vh;
  overflow-x: clip;
}

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

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

.page-shell {
  position: relative;
  overflow: clip;
}

.ocean {
  position: fixed;
  left: -5vw;
  width: 110vw;
  pointer-events: none;
  z-index: 0;
  opacity: 0.9;
  background-repeat: repeat-x;
  background-size: 48rem 100%;
  filter: blur(0.4px);
}

.ocean-back {
  bottom: 11rem;
  height: 10rem;
  opacity: 0.22;
  background-image:
    radial-gradient(circle at 15% 150%, rgba(255, 255, 255, 0.62) 0 13%, transparent 14%),
    radial-gradient(circle at 40% 150%, rgba(255, 255, 255, 0.55) 0 13%, transparent 14%),
    radial-gradient(circle at 65% 150%, rgba(255, 255, 255, 0.48) 0 13%, transparent 14%),
    radial-gradient(circle at 90% 150%, rgba(255, 255, 255, 0.58) 0 13%, transparent 14%);
  animation: waveDrift 22s linear infinite;
}

.ocean-mid {
  bottom: 6rem;
  height: 12rem;
  opacity: 0.34;
  background-image:
    radial-gradient(circle at 10% 150%, rgba(255, 255, 255, 0.7) 0 14%, transparent 15%),
    radial-gradient(circle at 35% 150%, rgba(255, 255, 255, 0.68) 0 14%, transparent 15%),
    radial-gradient(circle at 60% 150%, rgba(255, 255, 255, 0.6) 0 14%, transparent 15%),
    radial-gradient(circle at 85% 150%, rgba(255, 255, 255, 0.65) 0 14%, transparent 15%);
  animation: waveDrift 16s linear infinite reverse;
}

.ocean-front {
  bottom: -1rem;
  height: 13rem;
  opacity: 0.88;
  background-image:
    radial-gradient(circle at 10% 150%, rgba(238, 252, 255, 0.95) 0 16%, transparent 17%),
    radial-gradient(circle at 35% 150%, rgba(238, 252, 255, 0.92) 0 16%, transparent 17%),
    radial-gradient(circle at 60% 150%, rgba(238, 252, 255, 0.9) 0 16%, transparent 17%),
    radial-gradient(circle at 85% 150%, rgba(238, 252, 255, 0.96) 0 16%, transparent 17%);
  animation: waveDrift 11s linear infinite;
}

.hero,
.reason-section,
.quote-section,
.contents-section,
.insight-section,
.audience-section,
.cta-section {
  position: relative;
  z-index: 1;
}

.topbar,
.hero-grid,
.reason-section,
.quote-section,
.contents-section,
.insight-section,
.audience-section,
.cta-section {
  width: var(--content-width);
  margin: 0 auto;
}

.hero {
  padding: 22px 0 84px;
  min-height: 100svh;
  color: white;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand,
.top-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(18px);
}

.brand {
  color: #0a2740;
}

.top-link {
  color: #f8fdff;
  background: rgba(7, 27, 45, 0.34);
  border-color: rgba(255, 255, 255, 0.28);
  box-shadow: 0 10px 28px rgba(4, 20, 38, 0.16);
}

.brand-code {
  opacity: 0.72;
  letter-spacing: 0.12em;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
  align-items: center;
  padding-top: 50px;
}

.eyebrow {
  margin: 0 0 14px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: rgba(238, 252, 255, 0.76);
}

.hero h1,
.section-heading h2,
.cta-copy h2 {
  margin: 0;
  font-family: "Noto Serif TC", "PingFang TC", serif;
  font-weight: 900;
  line-height: 1.08;
}

.hero h1 {
  font-size: clamp(3rem, 11vw, 5.8rem);
  max-width: 10ch;
  text-wrap: balance;
}

.hero-subtitle {
  margin: 16px 0 0;
  color: var(--sand);
  font-size: clamp(1.4rem, 4vw, 2.2rem);
  font-family: "Noto Serif TC", serif;
}

.hero-lead,
.reason-card p,
.contents-copy p,
.glass-card p,
.insight-copy p,
.cta-copy p,
.quote-card blockquote {
  line-height: 1.85;
}

.hero-lead {
  margin: 20px 0 0;
  max-width: 42rem;
  color: rgba(255, 255, 255, 0.92);
}

.price-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  max-width: 32rem;
  margin-top: 28px;
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.09);
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.price-panel .label {
  display: block;
  font-size: 0.84rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.74);
}

.price-panel strong {
  display: block;
  margin-top: 8px;
  font-size: 2rem;
}

.price-panel p {
  grid-column: 1 / -1;
  margin: 0;
  color: rgba(255, 255, 255, 0.84);
}

.hero-actions,
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 24px;
  border-radius: 999px;
  font-weight: 800;
  transition:
    transform 180ms ease,
    background 180ms ease,
    color 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: #062235;
  background: linear-gradient(135deg, var(--gold), #fff2c9);
  box-shadow: 0 18px 36px rgba(255, 207, 122, 0.28);
}

.button-secondary {
  color: white;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-visual {
  justify-self: end;
  width: min(100%, 31rem);
}

.book-stage {
  position: relative;
  aspect-ratio: 0.9;
  display: grid;
  place-items: center;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(10px);
}

.orb-a {
  inset: 14% 10% auto auto;
  width: 15rem;
  height: 15rem;
  background: radial-gradient(circle, rgba(124, 226, 239, 0.74), transparent 68%);
}

.orb-b {
  inset: auto auto 8% 2%;
  width: 18rem;
  height: 18rem;
  background: radial-gradient(circle, rgba(255, 207, 122, 0.42), transparent 72%);
}

.book-float {
  position: relative;
  z-index: 1;
  width: min(100%, 24rem);
  filter: drop-shadow(0 30px 48px rgba(4, 20, 38, 0.45));
  transform: translateY(0) rotate(-8deg);
  will-change: transform;
}

.book-float img {
  animation: bookBob 5.5s ease-in-out infinite;
}

.section-heading {
  max-width: 42rem;
}

.section-heading h2 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: #082033;
}

.section-heading .eyebrow {
  color: #176785;
}

.reason-section,
.contents-section,
.insight-section,
.audience-section,
.cta-section {
  padding: 110px 0 0;
}

.reason-grid,
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 30px;
}

.reason-card,
.glass-card,
.quote-card,
.page-frame,
.insight-card,
.cta-section {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.reason-card,
.glass-card,
.quote-card,
.insight-card {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.6);
}

.reason-card {
  padding: 26px;
}

.reason-card span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: rgba(12, 114, 147, 0.12);
  color: #0a6886;
  font-weight: 800;
}

.reason-card h3,
.glass-card h3,
.insight-copy h3 {
  margin: 16px 0 12px;
  font-family: "Noto Serif TC", serif;
  font-size: 1.5rem;
  color: #0a2134;
}

.quote-section {
  padding-top: 34px;
}

.quote-card {
  padding: 34px;
  background:
    linear-gradient(135deg, rgba(5, 35, 58, 0.92), rgba(15, 96, 122, 0.88)),
    rgba(255, 255, 255, 0.08);
  color: white;
}

.quote-kicker {
  margin: 0 0 14px;
  color: rgba(255, 255, 255, 0.66);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

.quote-card blockquote {
  margin: 0;
  font-family: "Noto Serif TC", serif;
  font-size: clamp(1.4rem, 3.8vw, 2.3rem);
}

.contents-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 24px;
  align-items: start;
  margin-top: 30px;
}

.contents-copy {
  padding: 30px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(18px);
}

.chapter-list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.chapter-list li {
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(10, 104, 134, 0.07);
  color: #0e354a;
  font-weight: 700;
}

.page-frame {
  overflow: hidden;
  background: white;
}

.page-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.insight-stack {
  display: grid;
  gap: 22px;
  margin-top: 30px;
}

.insight-card {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 24px;
  padding: 24px;
  align-items: center;
}

.insight-card.reverse {
  grid-template-columns: 1.05fr 0.95fr;
}

.insight-tag {
  margin: 0;
  color: #0e6d8d;
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.insight-media,
.insight-trio {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.insight-media img {
  width: 100%;
  aspect-ratio: 1.08;
  object-fit: cover;
}

.glass-card {
  padding: 24px;
}

.cta-section {
  margin-top: 110px;
  margin-bottom: 140px;
  padding: 42px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 22px;
  align-items: center;
  background:
    linear-gradient(135deg, rgba(6, 38, 63, 0.9), rgba(19, 119, 145, 0.9)),
    rgba(255, 255, 255, 0.08);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.cta-copy .eyebrow {
  color: rgba(255, 255, 255, 0.68);
}

.cta-copy h2 {
  font-size: clamp(2rem, 4.8vw, 3.4rem);
}

.floating-buy {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 10;
  min-height: 52px;
  padding: 0 20px;
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  background: #06263c;
  color: white;
  box-shadow: 0 24px 48px rgba(5, 18, 34, 0.24);
  transform: translateY(110px);
  opacity: 0;
  transition:
    transform 220ms ease,
    opacity 220ms ease;
}

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

.reveal {
  opacity: 0;
  transform: translateY(34px);
  transition:
    opacity 600ms ease,
    transform 600ms ease;
}

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

@keyframes waveDrift {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-24rem);
  }
}

@keyframes bookBob {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@media (max-width: 960px) {
  .hero-grid,
  .contents-layout,
  .insight-card,
  .insight-card.reverse,
  .cta-section {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    justify-self: stretch;
    margin-top: 8px;
  }

  .book-stage {
    aspect-ratio: auto;
    min-height: 26rem;
  }

  .reason-grid,
  .audience-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .hero {
    padding-bottom: 64px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .price-panel {
    grid-template-columns: 1fr;
  }

  .hero-actions,
  .cta-actions {
    flex-direction: column;
  }

  .button,
  .floating-buy {
    width: 100%;
  }

  .quote-card,
  .cta-section,
  .contents-copy,
  .reason-card,
  .glass-card,
  .insight-card {
    padding: 22px;
  }

}