body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    font-family: 'Helvetica Neue', Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    color: #333;
}
.container {
    background: #ffffff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
    text-align: center;
}
h1, h3 { margin-bottom: 20px; color: #444; }
input {
    width: 100%; padding: 12px; margin: 10px 0;
    border: 1px solid #ddd; border-radius: 5px; box-sizing: border-box;
    font-size: 16px; transition: 0.3s;
}
input:focus { border-color: #667eea; outline: none; box-shadow: 0 0 5px rgba(102, 126, 234, 0.5); }
button {
    width: 100%; padding: 12px; margin-top: 20px;
    background: #667eea; color: white; border: none; border-radius: 5px;
    font-size: 16px; cursor: pointer; transition: background 0.3s;
}
button:hover { background: #764ba2; }
a { display: block; margin-top: 15px; color: #667eea; text-decoration: none; font-size: 14px; }
a:hover { text-decoration: underline; }
.message { margin-bottom: 15px; color: #ff4b5c; font-size: 14px; }