.editor-layout {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

@media (min-width: 800px) {
    .editor-layout {
        flex-direction: row;
        align-items: stretch;
    }
}

.editor-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.col-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.tabs {
    display: flex;
    background-color: var(--color-border);
    border-radius: var(--radius);
    padding: 3px;
}

.tab-btn {
    background: transparent;
    border: none;
    padding: 0.4rem 1rem;
    font-size: 0.95rem;
    color: var(--color-text);
    border-radius: var(--radius);
    margin: 0;
}

.tab-btn:hover {
    background-color: rgba(0,0,0,0.05);
}

.tab-btn.active {
    background-color: var(--color-white);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    font-weight: bold;
}

[data-theme="dark"] .tab-btn.active {
    background-color: #333;
    color: var(--color-white);
}

#md-input, #html-output, .preview-box {
    width: 100%;
    height: 450px;
    padding: var(--spacing-md);
    font-size: 1.05rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background-color: var(--color-white);
    color: var(--color-text);
    resize: vertical;
}

#md-input {
    font-family: "Courier New", Courier, monospace;
}

#html-output {
    font-family: "Courier New", Courier, monospace;
    background-color: #282c34;
    color: #abb2bf;
}

.preview-box {
    overflow-y: auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    line-height: 1.6;
}

.preview-box h1, .preview-box h2, .preview-box h3 {
    margin-top: 0;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.3rem;
}

.preview-box code {
    background-color: rgba(0,0,0,0.05);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: monospace;
}

.preview-box pre {
    background-color: #f6f8fa;
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
}

[data-theme="dark"] #md-input, [data-theme="dark"] .preview-box {
    background-color: var(--color-light-gray);
}

[data-theme="dark"] .preview-box pre {
    background-color: #2d2d2d;
}