body.bg-full {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: url('logo.png') no-repeat center center fixed;
    background-size: cover;
    color: #fff;
}
.overlay {
    background: rgba(0, 0, 0, 0.1);
    min-height: 100vh;
    padding: 4rem 1rem;
}
.about, .features, .signup {
    max-width: 700px;
    margin: 2rem auto;
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.5); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    color: #000;
    border-radius: 10px;
}
.features ul {
    list-style: none;
    padding: 0;
}
.features li {
    margin: 0.5rem 0;
    font-size: 1.1rem;
}
.signup form {
    margin-top: 1rem;
}
.signup input[type="email"] {
    padding: 0.5rem;
    width: 70%;
    max-width: 300px;
    margin-bottom: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}
.signup button {
    padding: 0.6rem 1.2rem;
    background-color: #2a62ff;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}
.signup button:hover {
    background-color: #1c48c4;
}
footer {
    text-align: center;
    padding: 2rem 1rem;
    font-size: 0.9rem;
    color: gold;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.about, .features, .signup {
  animation: fadeInUp 1s ease forwards;
  opacity: 0;
  animation-delay: 0.3s;
}

.features li {
  position: relative;
  animation: fadeInUp 1s ease forwards;
  opacity: 0;
}

.features li:nth-child(1) { animation-delay: 0.4s; }
.features li:nth-child(2) { animation-delay: 0.6s; }
.features li:nth-child(3) { animation-delay: 0.8s; }
.features li:nth-child(4) { animation-delay: 1s; }

html {
  scroll-behavior: smooth;
}
header {
  position: sticky;
  top: 0;
  background-color: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(10px);
  padding: 1rem;
  text-align: center;
  z-index: 999;
}
.back-to-top {
  position: fixed;
  bottom: 40px;
  right: 30px;
  padding: 0.6rem 1.2rem;
  background: #2a62ff;
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
  display: none;
  z-index: 999;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}
.back-to-top.show {
  display: block;
}

.collapsible {
  background-color: #2a62ff;
  color: white;
  cursor: pointer;
  padding: 0.8rem 1.2rem;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 1.1rem;
  border-radius: 8px;
  margin-bottom: 0.5rem;
}
.collapsible.active {
  background-color: #204fd1;
}
.content {
  display: none;
  overflow: hidden;
}