:root {
    --bg-color: #0d1117;
    --container-bg: #161b22;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent-color: #58a6ff;
    --accent-hover: #1f6feb;
    --border-color: #30363d;
    --drop-zone-bg: #0d1117;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    padding: 20px;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 900px;
    background-color: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 40px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.5);
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

header p {
    color: var(--text-secondary);
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    background-color: var(--drop-zone-bg);
    transition: all 0.2s ease;
    margin-bottom: 30px;
}

.drop-zone:hover, .drop-zone.active {
    border-color: var(--accent-color);
    background-color: rgba(88, 166, 255, 0.05);
}

.drop-zone p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.preview-container {
    margin-top: 20px;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.preview-header h2 {
    font-size: 1.25rem;
    font-weight: 400;
}

textarea {
    width: 100%;
    height: 400px;
    background-color: var(--bg-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 16px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 14px;
    resize: vertical;
}

.btn {
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: background-color 0.2s;
    font-size: 0.9rem;
}

.btn-primary {
    background-color: var(--accent-color);
    color: #ffffff;
}

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

.hidden {
    display: none;
}

footer {
    margin-top: 40px;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    .drop-zone {
        padding: 40px 10px;
    }

    .preview-header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }
    
    .btn {
        width: 100%;
    }
}