* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", sans-serif;
}

body {
  background: radial-gradient(circle at top, #0a1a2a, #000);
  height: 100vh;
  overflow: hidden;
}

/* Welcome screen */
#welcome-screen {
  position: fixed;
  inset: 0;
  background: black;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

#welcome-screen h1 {
  color: #fff;
  font-size: 3rem;
}

#welcome-screen span {
  color: #e6c27a;
  text-shadow: 0 0 20px #00f0ff;
}

/* Main layout */
.container {
  height: 100vh;
  display: flex;
  padding: 30px;
  gap: 30px;
}

.hidden {
  display: none;
}

/* Slider */
.slider {
  flex: 1;
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 0 30px rgba(0,255,255,0.2);
}

.slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: 1s;
}

.slide.active {
  opacity: 1;
}

/* Register form */
.form-box {
  flex: 1;
  backdrop-filter: blur(15px);
  background: rgba(255,255,255,0.05);
  border-radius: 20px;
  padding: 40px;
  color: #fff;
  box-shadow: 0 0 40px rgba(0,255,255,0.15);
}

.form-box h2 {
  color: #e6c27a;
  margin-bottom: 25px;
  text-align: center;
}

.form-box input {
  width: 100%;
  padding: 12px;
  margin-bottom: 15px;
  border-radius: 8px;
  border: none;
  outline: none;
  background: rgba(255,255,255,0.1);
  color: #fff;
}

.form-box input::placeholder {
  color: #aaa;
}

.form-box button {
  width: 100%;
  padding: 12px;
  background: linear-gradient(135deg, #e6c27a, #00f0ff);
  border: none;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
  margin-top: 10px;
}

/* Responsive */
@media (max-width: 900px) {
  .container {
    flex-direction: column;
  }

  .slider {
    height: 40vh;
  }
}