body {
  background: linear-gradient(120deg, #3a0ca3, #7209b7, #f72585);
  background-size: 400% 400%;
  animation: gradientBG 15s ease infinite;
  color: #fff;
  font-family: 'Quicksand', sans-serif;
  margin: 0;
  padding: 0;
  text-align: center;
  position: relative;
}
@keyframes gradientBG {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
#background-logo {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90vw;
  height: auto;
  opacity: 0.05;
  z-index: 0;
  pointer-events: none;
}
header, main, footer {
  position: relative;
  z-index: 1;
}
header {
  padding: 2rem 1rem 1rem;
  position: sticky;
  top: 0;
  background: linear-gradient(120deg, #3a0ca3cc, #7209b7cc, #f72585cc);
  backdrop-filter: blur(5px);
  z-index: 10;
  transition: all 0.3s ease;
}
header.shrink {
  padding: 0.5rem 1rem;
}
h1, h2 {
  font-family: 'Rubik', sans-serif;
  transition: font-size 0.3s ease;
}
header.shrink h1 {
  font-size: 1.4rem;
}
header.shrink p {
  font-size: 0.8rem;
}
#logo-container {
  margin: 0 auto 1rem;
  max-width: 200px;
  position: relative;
  transition: transform 0.3s ease-in-out, max-width 0.3s ease;
}
#logo-container:hover {
  transform: scale(1.05);
}
header.shrink #logo-container {
  max-width: 100px;
  transform: scale(0.9);
}
#logo {
  width: 100%;
  border-radius: 10px;
}
.eye {
  position: absolute;
  width: 4%;
  height: 4%;
  background-color: black;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}
.eye::after {
  content: '';
  position: absolute;
  width: 41%;
  height: 41%;
  background-color: white;
  border-radius: 50%;
  top: 25%;
  left: 25%;
}
#sparkle {
  position: absolute;
  font-size: 24px;
  opacity: 0;
}
main {
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(8px);
  margin: 1rem auto;
  padding: 2rem;
  max-width: 850px;
  border-radius: 20px;
  box-shadow: 0 0 25px rgba(0,0,0,0.4);
}
section {
  margin: 2rem 0;
}
a {
  color: #ffee00;
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s ease;
}
a:hover {
  color: #ffffff;
}
.button {
  display: inline-block;
  background-color: #ffee00;
  color: #000;
  padding: 0.6rem 1.2rem;
  border-radius: 30px;
  margin-top: 1rem;
  text-decoration: none;
  font-weight: bold;
  transition: all 0.3s ease;
}
.button:hover {
  background-color: #fff;
  color: #3a0ca3;
  box-shadow: 0 0 10px #ffee00aa;
}
footer {
  margin-top: 2rem;
  padding: 1rem;
  background: rgba(0,0,0,0.4);
  font-size: 0.9rem;
}
.message {
  display: none;
}

.message.success,
.message.error {
  display: block;
  background: white;
  color: black;
  padding: 1em;
  margin-top: 1em;
  border-radius: 5px;
  box-shadow: 0 0 5px rgba(0,0,0,0.3);
}

.success { border-left: 5px solid #4CAF50; }
.error   { border-left: 5px solid #f44336; }