* {
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
  margin: 0;
  height: 100vh;
  background: linear-gradient(135deg, #131313, #131313);
  display: flex;
  justify-content: center;
  align-items: center;
}

/* KAPSAYICI */
.login-wrapper {
  width: 100%;
  padding: 20px;
}

/* KUTU */
.login-box {
  max-width: 360px;
  margin: auto;
  background: #fff;
  padding: 30px 25px;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
  text-align: center;
}

/* BAŞLIK */
.login-box h1 {
  margin-bottom: 20px;
  font-size: 22px;
  color: #131313;
}

/* HATA */
.error {
  background: #ffe5e5;
  color: #b00020;
  padding: 10px;
  border-radius: 6px;
  font-size: 14px;
  margin-bottom: 15px;
}

/* INPUT */
.login-box input {
  width: 100%;
  padding: 12px 14px;
  margin-bottom: 12px;
  border-radius: 8px;
  border: 1px solid #ccc;
  font-size: 15px;
  outline: none;
}

.login-box input:focus {
  border-color: #131313;
}

/* BUTTON */
.login-box button {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 8px;
  background: #131313;
  color: #fff;
  font-size: 16px;
  cursor: pointer;
}

.login-box button:hover {
  background: #131313;
}

/* MOBILE */
@media (max-width: 400px) {
  .login-box {
    padding: 25px 18px;
  }
}