@import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;600&family=Raleway:wght@600;700&display=swap');

:root {
  --primary: #0077b6;
  --dark: #03045e;
  --text: #495057;
  --bg: #f8f9fa;
  --white: #ffffff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Open Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

h1, h2, h3 {
  font-family: 'Raleway', sans-serif;
  color: var(--dark);
}

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

ul {
  list-style: none;
}

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

.container {
  max-width: 1100px;
  margin: auto;
  padding: 2rem;
}

.header {
  background: var(--dark);
  padding: 1rem 0;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav__logo {
  color: var(--white);
  font-weight: 700;
  font-size: 1.2rem;
}

.nav__list {
  display: flex;
  gap: 1.5rem;
}

.nav__list a {
  color: var(--white);
  font-weight: 600;
}

.home__image img {
  width: 100%;
  max-height: 450px;
  object-fit: cover;
  animation: float 6s ease-in-out infinite;
}

.home__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  margin-top: 3rem;
  align-items: center;
}

.home__subtitle {
  color: var(--primary);
  font-weight: 600;
}

.home__text {
  animation: fadeUp 1.2s ease;
}

.home__text p {
  margin: 1rem 0;
}

.home__video iframe {
  width: 100%;
  height: 315px;
  border-radius: 12px;
  animation: fadeUp 1.5s ease;
  transition: transform .5s ease, box-shadow .5s ease;
}

.home__video iframe:hover {
  transform: scale(1.03);
  box-shadow: 0 15px 30px rgba(0,0,0,.3);
}

.button {
  display: inline-block;
  background: var(--primary);
  color: var(--white);
  padding: .7rem 1.4rem;
  margin-top: 1rem;
  border-radius: 6px;
  font-weight: 600;
}

.section {
  padding: 4rem 0;
  text-align: center;
}

.section__intro {
  max-width: 700px;
  margin: 1rem auto 3rem;
  font-size: 1rem;
}

.whale-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.whale-card {
  background: var(--white);
  border-radius: 14px;
  padding: 1.5rem;
  box-shadow: 0 10px 25px rgba(0,0,0,.12);
  text-align: left;
  transition: transform .4s ease, box-shadow .4s ease;
}

.whale-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 35px rgba(0,0,0,.2);
}

.whale-card h3 {
  margin-bottom: .8rem;
  color: var(--primary);
}

.whale-card p {
  font-size: .9rem;
  margin-bottom: .4rem;
}

.book {
  position: relative;
  width: 300px;
  height: 420px;
  margin: 3rem auto;
  perspective: 1200px;
}

.book input {
  display: none;
}

.pages {
  width: 100%;
  height: 100%;
  position: relative;
}

.page {
  position: absolute;
  width: 100%;
  height: 100%;
  background: var(--white);
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
  padding: 1rem;
  text-align: center;
  transform-origin: left;
  transition: transform 1s ease;
}

.page img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 10px;
  margin-bottom: 1rem;
}

.page h3 {
  margin-bottom: .5rem;
}

.page p {
  font-size: .9rem;
}

.page label {
  position: absolute;
  bottom: 15px;
  right: 15px;
  font-size: 1.5rem;
  cursor: pointer;
}

#page1:checked ~ .pages .page1 {
  transform: rotateY(0);
  z-index: 4;
}

#page2:checked ~ .pages .page1 {
  transform: rotateY(-180deg);
}

#page2:checked ~ .pages .page2 {
  transform: rotateY(0);
  z-index: 4;
}

#page3:checked ~ .pages .page2 {
  transform: rotateY(-180deg);
}

#page3:checked ~ .pages .page3 {
  transform: rotateY(0);
  z-index: 4;
}

#page4:checked ~ .pages .page3 {
  transform: rotateY(-180deg);
}

#page4:checked ~ .pages .page4 {
  transform: rotateY(0);
  z-index: 4;
}

.footer {
  background: var(--dark);
  color: var(--white);
  text-align: center;
  padding: 1.5rem;
}

@keyframes float {
  0% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
  100% { transform: translateY(0); }
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  .home__content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .book {
    width: 260px;
    height: 380px;
  }
}