body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(to right, #0f0f0f, #1a1a1a);
    color: #fff;
}

.login-container {
    max-width: 400px;
    margin: 100px auto;
    background-color: #1c1c1c;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 191, 255, 0.2);
    text-align: center;
}

.login-container h2 {
    margin-bottom: 30px;
    color: #4da6ff;
}

.login-container input {
    width: 100%;
    padding: 12px;
    margin-bottom: 20px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
}

.login-container button {
    width: 100%;
    padding: 12px;
    background-color: #4da6ff;
    color: #fff;
    font-size: 1.1rem;
    font-weight: bold;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.login-container button:hover {
    background-color: #ff4d4d;
}

.login-footer {
    text-align: center;
    margin-top: 20px;
}

.login-footer p {
    color: #aaa;
    margin: 5px 0;
}

.login-footer a {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}

.login-footer a:hover {
    text-decoration: underline;
}

.hidden {
    display: none;
}

.error {
    display: block;
    color: #ff4d4d;
    font-size: 0.9rem;
    margin-top: -15px;
    margin-bottom: 10px;
    text-align: left;
}

.btn-register,
.btn-login {
  --clr-font-main: hsla(0 0% 20% / 100);
  --btn-bg-1: hsla(194 100% 69% / 1);
  --btn-bg-2: hsla(217 100% 56% / 1);
  --btn-bg-color: hsla(360 100% 100% / 1);
  --radii: 0.5em;
  display: inline-block;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  padding: 0.5em 1em;
  min-width: 100px;
  min-height: 36px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: 0.8s;
  background-size: 280% auto;
  background-image: linear-gradient(
    325deg,
    var(--btn-bg-2) 0%,
    var(--btn-bg-1) 55%,
    var(--btn-bg-2) 90%
  );
  border: none;
  border-radius: var(--radii);
  color: var(--btn-bg-color);
  box-shadow:
    0px 0px 20px rgba(71, 184, 255, 0.5),
    0px 5px 5px -1px rgba(58, 125, 233, 0.25),
    inset 4px 4px 8px rgba(175, 230, 255, 0.5),
    inset -4px -4px 8px rgba(19, 95, 216, 0.35);
}

.btn-register:hover,
.btn-login:hover {
  background-position: right top;
}

.btn-register:is(:focus, :focus-visible, :active),
.btn-login:is(:focus, :focus-visible, :active) {
  outline: none;
  box-shadow:
    0 0 0 3px var(--btn-bg-color),
    0 0 0 6px var(--btn-bg-2);
}