* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: 'Segoe UI', Tahoma, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}
.card {
    background: #fff;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    margin-top: 40px;
}
h1, h2 { margin-bottom: 15px; color: #333; }
p { margin-bottom: 15px; line-height: 1.6; }
label { display: block; margin-bottom: 5px; font-weight: 600; }
input[type=text], input[type=password] {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
}
.btn {
    display: inline-block;
    padding: 10px 20px;
    background: #667eea;
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 14px;
    margin: 5px 5px 5px 0;
    transition: all 0.3s;
}
.btn:hover { background: #5568d3; transform: translateY(-2px); }
.btn.danger { background: #e74c3c; }
.btn.danger:hover { background: #c0392b; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-group { margin-top: 20px; }
.btn-group.vertical { display: flex; flex-direction: column; }
.btn-group.vertical .btn { width: 100%; text-align: center; }
.alert { padding: 10px; border-radius: 8px; margin-bottom: 15px; }
.alert.error { background: #f8d7da; color: #721c24; }
.hint { font-size: 12px; color: #888; margin-top: 10px; }
.info {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
}
.info h3 { margin-bottom: 10px; font-size: 16px; }
.info ol { padding-left: 20px; }
.info li { margin-bottom: 5px; }