body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, #1a1a1a, #2d2d2d);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #fff;
}
.container {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    width: 320px;
    text-align: center;
    transition: transform 0.3s ease;
}
.container:hover {
    transform: scale(1.05);
}
.logo {
    width: 120px;
    margin-bottom: 20px;
    filter: drop-shadow(0 0 10px #6b48ff);
}
input {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border: none;
    border-radius: 25px;
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    outline: none;
    transition: background 0.3s ease;
}
input:focus {
    background: rgba(255, 255, 255, 0.3);
}
button {
    width: 100%;
    padding: 12px;
    background: #6b48ff;
    color: #fff;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.2s ease;
}
button:hover {
    background: #5a3ce6;
    transform: translateY(-2px);
}
#toggleForm {
    margin-top: 15px;
    color: #6b48ff;
    cursor: pointer;
    text-decoration: underline;
}
.error {
    color: #ff4d4d;
    font-size: 0.9em;
    display: none;
    margin-top: 5px;
}