body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  padding: 0;
  background: #fff;
  color: #333;
}
  
.container {
  padding: 20px;
  max-width: 1200px;
  margin: auto;
}

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

.header h2 {
  font-size: 1.5em;
  margin: 0;
}

.green {
  color: #60b044;
}

.blue {
  color: #0a3172;
}

.o4f_red {
  color: #dc2a0b;
}

.logos img {
  height: 50px;
  margin-left: 10px;
}

.green-bar {
  height: 10px;
  background: #4caf50;
  border: none;
  margin: 20px 0;
}

.content {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
}

.left-graphic img {
  max-width: 400px;
  width: 100%;
  height: auto;
  mask-image: linear-gradient(to right, rgba(0,0,0,1), rgba(0,0,0,0));
}

.right-text {
  flex: 1;
  min-width: 200px;
}

.right-text h1 {
  font-size: 1.8em;
  line-height: 1.2;
}

.speakers {
  margin-top: 20px;
}

.speaker {
  font-weight: bold;
  padding: 4px 8px;
  border-radius: 4px;
  color: #fff;
  margin-right: 5px;
}

.blue-bg {
  background-color: #7ab6f0;
}

.red-bg {
  background-color: #f27a63;
}

.yellow-bg {
  background-color: #fbbc04;
}

.o4f-red-bg {
  background-color: #dc2a0b;
  padding-right: 50px;
  mask-image: linear-gradient(to right, rgba(0,0,0,1), rgba(0,0,0,0));
}

.details {
  margin-top: 20px;
  font-size: 1em;
  line-height: 1.6;
}

.footer-actions {
  margin-top: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.who {
  background-color: #e0f7e9;
  padding: 10px;
  border-radius: 8px;
  font-size: 0.9em;
}

.register-btn {
  background-color: #dc2a0b;
  color: #fff;
  padding: 15px 40px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  font-size: 1.3em;
  border: solid 3px black;
}
.bold {
  font-weight: bold;
}

.citation{
  font-size: 0.5em;
  color: #747474;
}
.citation a{
  color: #747474;
  text-decoration: None;
}
.big{
  font-size: 2.2em;
}



.clicker {
  width: 100%;
  outline:none;
  cursor:pointer;
  color: #4caf50;
  text-align: right;
}
  
.hiddendiv{
  width: 100%;
  border-radius: 10px;
  display:none;
  text-align: justify;
}
  
.clicker:focus + .hiddendiv{
  display:block;
}