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

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

.login-box {
    width: 350px;
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,.2);
    text-align: center;
}

.login-box h2 {
    margin-bottom: 10px;
}

.login-box p {
    color: #777;
    margin-bottom: 25px;
}

.login-box input {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border-radius: 8px;
    border: 1px solid #ddd;
}

.login-box button {
    width: 100%;
    padding: 12px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
}

.login-box button:hover {
    background: #5563d6;
}

.error {
    margin-top: 15px;
    color: red;
    font-size: 14px;
}