:root {
    --bg-color: #f4f7f6;
    --primary-color: #007f5f;
    --card-bg: #ffffff;
    --text-color: #2b2d42;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
}

header {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 768px) {
    .container { grid-template-columns: 1fr; }
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

textarea {
    width: 100%;
    height: 150px;
    padding: 10px;
    box-sizing: border-box;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    resize: none;
    font-size: 1rem;
}

button {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 1rem;
    transition: background 0.2s;
}

button:hover {
    background-color: #005f44;
}

.result-box {
    margin-top: 1rem;
    padding: 10px;
    background-color: #f8fafc;
    border-left: 4px solid var(--primary-color);
    border-radius: 4px;
    min-height: 50px;
    font-size: 0.95rem;
    white-space: pre-wrap;
}