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

body {
  margin: 0;
  font-family: 'Poppins', sans-serif;
  background: url('https://images.pexels.com/photos/356043/pexels-photo-356043.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260') no-repeat center center fixed;
  background-size: cover;
  color: #222;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 50px 20px;
}

.container {
  background: rgba(255, 255, 255, 0.95);
  max-width: 880px;
  padding: 45px 55px;
  border-radius: 18px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  animation: slideInFade 1.3s ease forwards;
}

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

h1 {
  font-weight: 700;
  font-size: 3rem;
  color: #1e3a8a;
  letter-spacing: 1.8px;
  margin-bottom: 8px;
}

.back-link {
  font-weight: 600;
  font-size: 1.1rem;
  color: #1e3a8a;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.3s ease;
  display: inline-block;
  margin-top: 12px;
}
.back-link:hover {
  border-bottom: 2px solid #1e3a8a;
}

h2 {
  color: #294172;
  border-bottom: 3px solid #3b82f6;
  padding-bottom: 8px;
  margin-top: 35px;
  margin-bottom: 22px;
  font-weight: 700;
}

.definition p,
.types ul {
  font-size: 1.22rem;
  line-height: 1.75;
  max-width: 720px;
  margin: 0 auto;
}

.types ul {
  list-style-type: square;
  padding-left: 26px;
}

.types li {
  margin-bottom: 13px;
}

.video iframe {
  display: block;
  margin: 30px auto;
  width: 100%;
  max-width: 560px;
  height: 315px;
  border-radius: 16px;
  box-shadow: 0 0 25px rgba(59, 130, 246, 0.4);
}

/* Animation */
@keyframes slideInFade {
  0% {
    opacity: 0;
    transform: translateX(-40px);
  }
  100% {
    opacity: 1;
    transform: translateX(0);
  }
}