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

body {
  margin: 0;
  font-family: 'Open Sans', sans-serif;
  background: linear-gradient(rgba(245, 245, 250, 0.85), rgba(220, 220, 230, 0.9)),
    url('https://images.pexels.com/photos/256262/pexels-photo-256262.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260') no-repeat center center fixed;
  background-size: cover;
  color: #2a2a2a;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 60px 15px;
}

.container {
  background-color: rgba(255, 255, 255, 0.88);
  max-width: 880px;
  padding: 40px 50px;
  border-radius: 24px;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.1);
  animation: fadeSlideIn 1.4s ease forwards;
}

header {
  text-align: center;
  margin-bottom: 30px;
}

h1 {
  font-weight: 700;
  font-size: 3rem;
  letter-spacing: 1.3px;
  margin-bottom: 8px;
  color: #36454f;
}

.back-link {
  font-weight: 600;
  font-size: 1.1rem;
  color: #36454f;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.3s ease;
  display: inline-block;
  margin-top: 10px;
}
.back-link:hover {
  border-bottom: 2px solid #36454f;
}

h2 {
  color: #506070;
  border-bottom: 3px solid #7a8c9f;
  padding-bottom: 6px;
  margin-top: 30px;
  margin-bottom: 24px;
  font-weight: 700;
}

.intro-text p,
.key-points ul {
  font-size: 1.15rem;
  line-height: 1.7;
  max-width: 720px;
  margin: 0 auto;
  color: #2a2a2a;
}

.key-points ul {
  list-style-type: square;
  padding-left: 28px;
}

.key-points li {
  margin-bottom: 14px;
}

.video-wrapper iframe {
  display: block;
  margin: 28px auto;
  width: 100%;
  max-width: 560px;
  height: 315px;
  border-radius: 18px;
  box-shadow: 0 0 30px #7a8c9f66;
}

/* Animations */
@keyframes fadeSlideIn {
  0% {
    opacity: 0;
    transform: translateY(30px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}