* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #111417;
  color: #c8d0d8;
  font-family: "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

.banner {
  position: relative;
  overflow: hidden;
  text-align: center;
  padding: 25px 20px 20px;
  border-bottom: 3px solid #2d89b5;
}

.banner::before {
  content: "";
  position: absolute;
  inset: -20px;
  background: url("simtx-ss-01-tall.png") center 30% / cover no-repeat;
  filter: blur(4px) brightness(0.45);
  z-index: 0;
}

.banner > * {
  position: relative;
  z-index: 1;
}

.logo {
  max-width: 500px;
  width: 85%;
  margin: -60px 0;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.8));
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 30px 20px;
}

h2 {
  color: #4db2e2;
  border-bottom: 1px solid #2a3138;
  padding-bottom: 6px;
  font-weight: 600;
}

.center {
  text-align: center;
}

.btn {
  display: inline-block;
  background: #2d89b5;
  color: #fff;
  text-decoration: none;
  padding: 12px 28px;
  border-radius: 4px;
  font-weight: bold;
  box-shadow: 0 3px 0 #1c5c7b;
}

.btn:hover {
  background: #379ecf;
}

.btn:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 #1c5c7b;
}

footer {
  text-align: center;
  color: #5a646e;
  font-size: 0.85em;
  padding: 25px 20px;
  border-top: 1px solid #2a3138;
}