body{
  font-family: Arial, sans-serif;
  background:#f2f3f5;
  margin:0;
  color:#111;
}

.header{
  text-align:center;
  padding:40px 15px 25px;
}

.header h1{
  margin:0;
  font-size:44px;
  font-weight:800;
  color:#0b2f5a;
}

.header p{
  margin:10px 0 0;
  color:#0b2f5a;
  font-size:20px;
  line-height:1.4;
}

.container{
  max-width:900px;
  margin:0 auto;
  padding:10px 15px 60px;
  display:flex;
  flex-direction:column;
  gap:25px;
}

.lab-card{
  background:#fff;
  border-radius:18px;
  padding:28px 28px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  box-shadow:0 10px 25px rgba(0,0,0,0.12);
  border-left:8px solid #0b5bd3;
}

.lab-card h2{
  margin:0 0 8px;
  font-size:28px;
  color:#0b2f5a;
}

.lab-card p{
  margin:0;
  font-size:18px;
  color:#444;
}

.btn{
  background:#0b5bd3;
  color:white;
  text-decoration:none;
  padding:14px 26px;
  border-radius:10px;
  font-weight:700;
  font-size:18px;
  display:inline-block;
}

.btn:hover{
  opacity:0.92;
}

.back-link{
  color:#0b5bd3;
  text-decoration:none;
  font-weight:700;
  display:inline-block;
  margin-top:15px;
}

.back-link:hover{
  text-decoration:underline;
}

/* Lab report page */
.section{
  background:#fff;
  border-radius:18px;
  padding:28px;
  box-shadow:0 10px 25px rgba(0,0,0,0.10);
}

.section h2{
  margin:0 0 12px;
  color:#0b2f5a;
}

.pdf-box{
  width:100%;
  height:650px;
  border:1px solid #ddd;
  border-radius:12px;
}

@media(max-width:650px){
  .lab-card{
    flex-direction:column;
    text-align:center;
    gap:15px;
  }
}