.card {
    max-width: 700px;
}

.textarea-container {
    margin-bottom: 20px;
}

textarea {
    width: 100%;
    padding: 16px;
    font-family: 'Courier New', 'Fira Code', monospace;
    font-size: 14px;
    border-radius: 16px;
    border: 1px solid #cbd5e1;
    background: #fafcff;
    resize: vertical;
    min-height: 250px;
    transition: 0.2s;
}

textarea:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59,130,246,0.2);
}

.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
}

button {
    flex: 1;
    padding: 12px 16px;
    font-size: 16px;
    font-weight: 500;
    border-radius: 40px;
    border: none;
    background: #3b82f6;
    color: white;
    cursor: pointer;
    transition: 0.2s;
}

button:active {
    transform: scale(0.97);
}

.button-group button:nth-child(2) {
    background: #10b981;
}

.button-group button:nth-child(3) {
    background: #ef4444;
}

.error-box {
    background: #fee2e2;
    border-left: 4px solid #ef4444;
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 20px;
    font-family: monospace;
    font-size: 13px;
    color: #991b1b;
    white-space: pre-wrap;
    word-break: break-word;
}

.success-box {
    background: #d1fae5;
    border-left: 4px solid #10b981;
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 20px;
    font-size: 14px;
    color: #065f46;
}

.footer {
    max-width: 700px;
}

@media (max-width: 480px) {
    .button-group button {
        font-size: 14px;
        padding: 10px 12px;
    }
}