body {
    font-family: Arial, sans-serif;
    background: #f5f7fb;
    margin: 0;
    padding: 0;
    color: #222;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px 60px;
}

h1 {
    margin-bottom: 8px;
}

.sub {
    color: #666;
    margin-bottom: 24px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.card {
    background: white;
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 4px 14px rgba(0,0,0,0.08);
}

.card h2 {
    font-size: 20px;
    margin-top: 0;
    margin-bottom: 14px;
}

textarea {
    width: 100%;
    min-height: 110px;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 10px;
    resize: vertical;
    box-sizing: border-box;
    margin-bottom: 12px;
    font-size: 14px;
}

button {
    width: 100%;
    padding: 12px;
    background: #1f6feb;
    color: white;
    border: 0;
    border-radius: 10px;
    cursor: pointer;
    font-size: 15px;
    font-weight: bold;
}

button:hover {
    opacity: 0.92;
}

.result-box {
    margin-top: 30px;
    background: white;
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 4px 14px rgba(0,0,0,0.08);
}

pre {
    white-space: pre-wrap;
    word-break: break-word;
    background: #f8f9fc;
    padding: 16px;
    border-radius: 12px;
    min-height: 240px;
}