.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}
.login-box {
    background: #fff;
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
}
.logo { text-align: center; margin-bottom: 30px; }
.logo img { max-width: 80px; }
.logo h1 { font-size: 28px; margin: 5px 0; }
.logo p { color: #888; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: 600; }
.form-group input[type="text"] { width: 100%; padding: 10px; border: 1px solid #ddd; border-radius: 4px; }
.form-group.checkbox { display: flex; align-items: center; }
.form-group.checkbox input { margin-right: 8px; }
.btn-primary { width: 100%; padding: 12px; background: #007bff; color: #fff; border: none; border-radius: 4px; font-size: 16px; cursor: pointer; }
.btn-primary:hover { background: #0056b3; }
.alert { padding: 10px; margin-bottom: 15px; border-radius: 4px; }
.alert.error { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.modal { position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; overflow: auto; background-color: rgba(0,0,0,0.5); }
.modal-content { background-color: #fff; margin: 10% auto; padding: 20px; border-radius: 8px; max-width: 700px; position: relative; }
.close { position: absolute; right: 20px; top: 10px; font-size: 28px; font-weight: bold; cursor: pointer; }
.protocol-body { max-height: 500px; overflow-y: auto; padding: 10px; }