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

body {
  margin: 0;
  font-family: 'Raleway', sans-serif;
  background: linear-gradient(rgba(30, 60, 30, 0.85), rgba(10, 20, 10, 0.9)),
    url('https://images.pexels.com/photos/69141/pexels-photo-69141.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260') no-repeat center center fixed;
  background-size: cover;
  color: #e0f0d9;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 60px 20px;
}

.wrapper {
  background-color: rgba(25, 45, 20, 0.85);
  max-width: 900px;
  padding: 40px 50px;
  border-radius: 20px;
  box-shadow: 0 0 45px rgba(10, 40, 10, 0.7);
  animation: glowFadeIn 1.6s ease forwards;
}

header {
  text-align: center;
  margin-bottom: 32px;
}

h1 {
  font-weight: 700;
  font-size: 3.2rem;
  letter-spacing: 2px;
  margin-bottom: 14px;
  color: #a8d08d;
  text-shadow: 0 0 20px #7bb55c;
}

.back-link {
  font-weight: 600;
  font-size: 1.2rem;
  color: #a8d08d;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.3s ease;
  display: inline-block;
  margin-top: 14px;
}
.back-link:hover {
  border-bottom: 2px solid #a8d08d;
}

h2 {
  color: #b9dcae;
  border-bottom: 3px solid #8cbf5c;
  padding-bottom: 8px;
  margin-top: 35px;
  margin-bottom: 24px;
  font-weight: 700;
}

.intro p,
.topics ul {
  font-size: 1.25rem;
  line-height: 1.75;
  max-width: 740px;
  margin: 0 auto;
}

.topics ul {
  list-style-type: disc;
  padding-left: 28px;
}

.topics li {
  margin-bottom: 14px;
}

.video iframe {
  display: block;
  margin: 30px auto;
  width: 100%;
  max-width: 560px;
  height: 315px;
  border-radius: 18px;
  box-shadow: 0 0 30px #8cbf5caa;
}

/* Animation */
@keyframes glowFadeIn {
  0% {
    opacity: 0;
    box-shadow: 0 0 0 rgba(10, 40, 10, 0);
    transform: scale(0.95);
  }
  100% {
    opacity: 1;
    box-shadow: 0 0 45px rgba(10, 40, 10, 0.7);
    transform: scale(1);
  }
}