* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', sans-serif;
}

body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.login-container {
    background: #ffffff;
    padding: 40px;
    width: 350px;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    animation: fadeIn 0.6s ease-in-out;
}

h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

.input-group {
    position: relative;
    margin-bottom: 25px;
}

.input-group input {
    width: 100%;
    padding: 10px 10px;
    border: none;
    border-bottom: 2px solid #ccc;
    outline: none;
    transition: 0.3s;
}

.input-group label {
    position: absolute;
    top: 10px;
    left: 10px;
    color: #aaa;
    transition: 0.3s;
    pointer-events: none;
}

.input-group input:focus,
.input-group input:valid {
    border-color: #667eea;
}

.input-group input:focus + label,
.input-group input:valid + label {
    top: -10px;
    left: 5px;
    font-size: 12px;
    color: #667eea;
}

button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 25px;
    background: #667eea;
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background: #5a67d8;
}

.error {
    margin-top: 15px;
    color: red;
    text-align: center;
}

@keyframes fadeIn {
    from {opacity: 0; transform: translateY(-10px);}
    to {opacity: 1; transform: translateY(0);}
}