.app-container {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    padding: 40px;
    max-width: 500px;
    width: 100%;
    margin: 1rem auto;
}

.app-container .form-group {
    margin-bottom: 20px;
}

.app-container label {
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
}

.app-container input[type="text"] {
    width: 100%;
    padding: 12px 16px;
    font-size: 16px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    transition: border-color 0.3s;
}

.app-container input[type="text"]:focus {
    border-color: #0c1991;
}

.app-container button {
    width: 100%;
    padding: 12px 24px;
    background: linear-gradient(135deg, #0c1991 0%, #1023cc 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.app-container button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.app-container button:active {
    transform: translateY(0);
}

.app-container #result-container {
    margin-top: 24px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #0c1991;
    display: none;
}

.app-container #result-container.show {
    display: block;
}

.app-container .result-label {
    color: #0c1991;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.app-container #result-text {
    color: #333;
    font-size: 18px;
}

.app-container #error-container {
    margin-top: 24px;
    padding: 20px;
    background: #ffe6e2;
    border-radius: 8px;
    border-left: 4px solid #ff502b;
    display: none;
    color: #333;
    font-size: 18px;
}

.app-container #error-container.show {
    display: block;
}