:root {
    --primary-color: #4a90e2;
    --secondary-color: #f5f5f5;
    --text-color: #333;
    --border-color: #ddd;
    --bg-color: #fff;
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #64b5f6;
        --secondary-color: #333;
        --text-color: #f5f5f5;
        --border-color: #444;
        --bg-color: #121212;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    min-height: 100vh;
}

.app-container {
    max-width: 800px;
    width: 100%;
}

.converter-box {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

label {
    font-weight: bold;
    font-size: 14px;
}

textarea {
    width: 100%;
    height: 120px;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: monospace;
    font-size: 16px;
    resize: vertical;
    box-sizing: border-box;
}

.controls {
    display: flex;
    justify-content: center;
}

#swap-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 20px;
    padding: 5px;
    border-radius: 50%;
    transition: background-color 0.2s;
}

#swap-btn:hover {
    background-color: var(--secondary-color);
}

.action-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: opacity 0.2s;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.secondary-btn {
    background-color: var(--secondary-color);
    color: var(--text-color);
}

.cheat-sheet {
    background-color: var(--secondary-color);
    padding: 20px;
    border-radius: 12px;
}

.cheat-sheet h3 {
    margin-top: 0;
    margin-bottom: 15px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 10px;
}

.grid-item {
    background-color: var(--bg-color);
    padding: 8px;
    border-radius: 4px;
    text-align: center;
    font-family: monospace;
    border: 1px solid var(--border-color);
}

.char {
    font-weight: bold;
    font-size: 16px;
}

.code {
    color: var(--primary-color);
    font-size: 14px;
}