:root {
    --primary-green: #2e7d32;
    --light-green: #e8f5e9;
    --dark-green: #1b5e20;
    --white: #ffffff;
    --gray: #f4f4f4;
    --text-color: #333;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--light-green);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    background: var(--white);
    width: 100%;
    max-width: 600px;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    text-align: center;
}

h1 {
    color: var(--primary-green);
    margin-bottom: 10px;
}

.subtitle {
    color: #666;
    margin-bottom: 25px;
    font-size: 0.9rem;
}

.input-group {
    text-align: left;
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--dark-green);
}

textarea {
    width: 100%;
    height: 120px;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    resize: vertical;
    font-family: 'Courier New', Courier, monospace;
    font-size: 1rem;
    transition: border-color 0.3s;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-green);
}

.controls {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

button {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    transition: 0.3s;
}

.btn-primary {
    background-color: var(--primary-green);
    color: white;
}

.btn-primary:hover {
    background-color: var(--dark-green);
}

.btn-secondary {
    background-color: #eee;
    color: #333;
}

.btn-secondary:hover {
    background-color: #ddd;
}

.btn-copy {
    margin-top: 10px;
    background-color: var(--dark-green);
    color: white;
    width: 100%;
}

/* Mobile Responsive */
@media (max-width: 480px) {
    .container {
        padding: 20px;
    }
    .controls {
        flex-direction: column;
    }
}