* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #111;
    color: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-card {
    background: #fff;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    text-align: center;
    width: 90%;
    max-width: 400px;
    border: 1px solid #ddd;
    margin: 20px;
}

h1 {
    margin-bottom: 10px;
    color: #007bff;
    font-weight: 300;
}

p { color: #555; margin-bottom: 30px; }

input {
    width: 100%;
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 8px;
    border: 1px solid #ccc;
    background: #f5f5f5;
    color: #333;
    font-size: 1.2em;
    text-align: center;
    box-sizing: border-box;
}

button {
    width: 100%;
    padding: 15px;
    border-radius: 8px;
    border: none;
    background: #007bff;
    color: white;
    font-size: 1.1em;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover { background: #0056b3; }

.error {
    color: #ff4d4d;
    margin-top: 15px;
    display: none;
}