/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Poppins', sans-serif;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, #00bcd4 0%, #007bff 100%);
  background-attachment: fixed;
  overflow: hidden;
}

/* Arka plan dalgası */
body::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(255,255,255,0.2), transparent 60%),
              radial-gradient(circle at 80% 70%, rgba(255,255,255,0.15), transparent 70%);
  z-index: 0;
}

/* Form kutusu */
.login-box {
  position: relative;
  z-index: 1;
  width: 360px;
  padding: 40px 35px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 15px;
  backdrop-filter: blur(20px);
  color: #fff;
  box-shadow: 0 0 25px rgba(0,0,0,0.25);
  animation: fadeIn 0.7s ease-in;
}

/* Animasyon */
@keyframes fadeIn {
  from {opacity:0; transform: translateY(25px);}
  to {opacity:1; transform: translateY(0);}
}

.login-box h2 {
  text-align: center;
  margin-bottom: 25px;
  font-weight: 600;
  font-size: 24px;
  letter-spacing: .5px;
}

/* Etiket ve input */
.login-box label {
  font-size: 14px;
  color: #e0f7fa;
  margin-bottom: 5px;
  display: block;
}

.login-box input {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  border: none;
  margin-bottom: 18px;
  background: rgba(255,255,255,0.2);
  color: #fff;
  outline: none;
  font-size: 15px;
  transition: 0.3s;
}

.login-box input::placeholder {
  color: rgba(255,255,255,0.7);
}

.login-box input:focus {
  background: rgba(255,255,255,0.3);
  box-shadow: 0 0 0 2px rgba(0,188,212,0.6);
}

/* Buton */
button {
  width: 100%;
  padding: 12px;
  background: linear-gradient(135deg, #00acc1, #007bff);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: 0.3s;
}

button:hover {
  background: linear-gradient(135deg, #007bff, #00acc1);
  transform: scale(1.03);
}

/* Hata mesajı */
.error {
  text-align: center;
  color: #ffeb3b;
  margin-top: 12px;
  font-size: 13px;
}

/* Mobil uyum */
@media (max-width: 480px) {
  .login-box {
    width: 85%;
    padding: 30px 20px;
  }
  .login-box h2 {
    font-size: 20px;
  }
}