*{
  box-sizing:border-box;
}

body{
  margin:0;
  font-family:Arial, sans-serif;
  background:linear-gradient(to right,#eef2f7,#f9fbfd);
  color:#172033;
}

/* NAVBAR */
nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:18px 24px;
  background:linear-gradient(135deg,#0b1f3a,#1f4b85);
  box-shadow:0 4px 14px rgba(0,0,0,0.22);
  position:sticky;
  top:0;
  z-index:1000;
}

/* NAV BUTTONS */
nav button,
.card button{
  margin:6px;
  padding:11px 20px;
  border:none;
  border-radius:9px;
  background:linear-gradient(135deg,#1f4b85,#3a7bd5);
  color:white;
  cursor:pointer;
  font-weight:bold;
  transition:all 0.3s ease;
}

nav button:hover,
.card button:hover{
  transform:translateY(-2px);
  box-shadow:0 6px 16px rgba(0,0,0,0.22);
  background:linear-gradient(135deg,#3a7bd5,#1f4b85);
}

/* HERO */
.hero{
  text-align:center;
  padding:90px 20px;
  background:linear-gradient(135deg,#0b1f3a,#3a7bd5);
  color:white;
}

.hero h1{
  font-size:42px;
  margin-bottom:12px;
}

.hero p{
  font-size:18px;
  opacity:0.92;
}

/* CARDS */
.card{
  max-width:1000px;
  margin:34px auto;
  background:white;
  padding:38px;
  border-radius:20px;
  box-shadow:0 10px 32px rgba(0,0,0,0.09);
  line-height:1.7;
}

.card h2{
  color:#0b1f3a;
  margin-top:0;
}

/* INPUTS */
input{
  display:block;
  width:90%;
  max-width:420px;
  padding:13px 14px;
  margin:11px 0;
  border:1px solid #ccd4df;
  border-radius:10px;
  outline:none;
  font-size:15px;
}

input:focus{
  border-color:#3a7bd5;
  box-shadow:0 0 0 3px rgba(58,123,213,0.15);
}

/* VIDEO SECTION */
.videoGrid{
  display:flex;
  flex-wrap:wrap;
  gap:22px;
  justify-content:center;
}

.videoCard{
  background:#f7f9ff;
  padding:14px;
  border-radius:14px;
  box-shadow:0 6px 18px rgba(0,0,0,0.08);
}

.videoCard video{
  width:300px;
  max-width:100%;
  border-radius:12px;
}

/* MOBILE RESPONSIVE */
@media(max-width:768px){
  nav{
    flex-direction:column;
    gap:10px;
  }

  .hero h1{
    font-size:30px;
  }

  .hero{
    padding:65px 15px;
  }

  .card{
    margin:20px 12px;
    padding:25px;
  }

  nav button{
    padding:10px 14px;
    font-size:14px;
  }
}