:root {
    --primary-color: #8b5cf6;
    --primary-hover: #7c3aed;
    --bg-color: #f8fafc;
    --sidebar-bg: #ffffff;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
}

.app {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
}

/* Sidebar Styles */
.sidebar {
    background-color: var(--sidebar-bg);
    padding: 1.5rem;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.logo-icon {
    font-size: 1.5rem;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
}

.mode-selector {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
    padding: 0.25rem;
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
}

.mode-btn {
    padding: 0.75rem;
    border: none;
    border-radius: var(--radius-md);
    background: none;
    color: var(--text-muted);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.mode-btn.active {
    background-color: white;
    color: var(--text-color);
    box-shadow: var(--shadow-sm);
}

.format-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem;
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
}

.option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-color);
    font-size: 0.875rem;
    cursor: pointer;
}

.option input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    border-radius: 0.25rem;
    border: 1px solid var(--border-color);
    cursor: pointer;
}

.option input[type="number"] {
    width: 3rem;
    padding: 0.25rem;
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    font-size: 0.875rem;
}

.actions, .file-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.action-btn, .file-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: white;
    color: var(--text-color);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.action-btn:hover, .file-btn:hover {
    background-color: var(--bg-color);
}

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

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

.btn-icon {
    font-size: 1.25rem;
}

/* Content Styles */
.content {
    padding: 2rem;
    display: grid;
    grid-template-rows: 1fr 1fr;
    gap: 2rem;
    overflow: hidden;
}

.editor-container {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.editor-header h2 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
}

.editor-stats {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.format-badge {
    padding: 0.25rem 0.5rem;
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
    font-weight: 500;
}

.editor {
    flex: 1;
    min-height: 200px;
}

/* Error Styles */
.error-message {
    color: #ef4444;
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    margin: 0.5rem;
    background-color: #fee2e2;
    border-radius: var(--radius-md);
    display: none;
}

.error-message.visible {
    display: block;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .app {
        grid-template-columns: 240px 1fr;
    }
}

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

    .sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 1rem;
    }

    .content {
        padding: 1rem;
        gap: 1rem;
    }

    .mode-selector {
        margin-bottom: 1rem;
    }

    .actions {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }

    .file-actions {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }
}