/* Global Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}

body {
  background-color: #1B1B1B;
  color: #fff;
  overflow-x: hidden;
  position: relative;
}

.background-overlay {
  background: linear-gradient(145deg, #0ABAB5, #3AD29F);
  filter: blur(100px);
  width: 100%;
  height: 100vh;
  position: absolute;
  z-index: 0;
  opacity: 0.05;
}

header {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  padding: 2rem;
  z-index: 2;
  position: relative;
}

nav a {
  color: #ffffffcc;
  text-decoration: none;
  margin-left: 2rem;
  font-weight: 500;
  transition: 0.3s ease;
}

nav a:hover {
  color: #0ABAB5;
}

.hero {
  padding: 6rem 2rem 8rem 2rem;
  text-align: center;
  z-index: 2;
  position: relative;
  animation: fadeInUp 1s ease forwards;
}

.center-logo {
  display: block;
  margin: 0 auto 2rem auto;
  width: 180px;
  border-radius: 16px;
  opacity: 0.95;
  box-shadow: 0 0 30px rgba(10, 186, 181, 0.08);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.center-logo:hover {
  transform: scale(1.04);
  opacity: 1;
}

.title {
  font-size: 3rem;
  margin-bottom: 1rem;
  animation: fadeInUp 1.2s ease forwards;
}

.subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  color: #cccccc;
  animation: fadeInUp 1.4s ease forwards;
}

.start-button {
  padding: 1rem 2.5rem;
  border-radius: 50px;
  background: #0ABAB5;
  color: #000;
  font-weight: bold;
  text-decoration: none;
  font-size: 1.1rem;
  transition: 0.3s ease;
  animation: fadeInUp 1.6s ease forwards;
}

.start-button:hover {
  background: #3AD29F;
  transform: scale(1.05);
}

/* LOGIN + REGISTER */
.auth-container {
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1;
  position: relative;
}

.auth-card {
  background: rgba(0, 0, 0, 0.8);
  border: 1px solid #0ABAB5;
  border-radius: 16px;
  padding: 2rem;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 0 20px rgba(10, 186, 181, 0.3);
  animation: fadeInUp 0.8s ease;
}

.auth-logo {
  display: block;
  margin: 0 auto 1rem;
  width: 120px;
}

.auth-title {
  text-align: center;
  font-size: 1.5rem;
  color: #0ABAB5;
  margin-bottom: 2rem;
}

input, select {
  width: 100%;
  padding: 0.75rem;
  margin: 0.5rem 0 1rem;
  border-radius: 8px;
  border: none;
  background: #111;
  color: white;
  border: 1px solid #0ABAB5;
  transition: border 0.2s ease;
}

input:focus, select:focus {
  border-color: #3AD29F;
  outline: none;
}

button {
  width: 100%;
  padding: 0.8rem;
  border: none;
  border-radius: 8px;
  background: #0ABAB5;
  color: black;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.2s ease;
}

button:hover {
  background: #3AD29F;
  transform: translateY(-2px);
}

.auth-link {
  margin-top: 1rem;
  text-align: center;
  font-size: 0.9rem;
}

.auth-link a {
  color: #0ABAB5;
  text-decoration: none;
}

#strength-meter {
  text-align: center;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

/* Animation */
@keyframes fadeInUp {
  0% {
    transform: translateY(40px);
    opacity: 0;
  }
  100% {
    transform: translateY(0px);
    opacity: 1;
  }
}