* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #1e1e1e;
    color: #f0f0f0;
}

.container {
    display: flex;
    height: 100vh;
    width: 100%;
}

.pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 15px;
    border-right: 1px solid #333;
    min-width: 0;
}

.right-pane {
    border-right: none;
}

.pane-header {
    margin-bottom: 10px;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.label {
    font-weight: 600;
    color: #66afe9;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.pane-actions {
    display: flex;
    gap: 8px;
}

.action-btn {
    padding: 8px 12px;
    background-color: #2d2d2d;
    color: #66afe9;
    border: 1px solid #66afe9;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s;
}

.action-btn:hover {
    background-color: #66afe9;
    color: #1e1e1e;
}

.action-btn:active {
    transform: translateY(1px);
}

#markdownInput {
    flex: 1;
    width: 100%;
    resize: none;
    border: 1px solid #333;
    border-radius: 4px;
    padding: 15px;
    font-family: "Consolas", "Monaco", monospace;
    font-size: 14px;
    line-height: 1.5;
    outline: none;
    background-color: #2d2d2d;
    color: #f0f0f0;
}

#markdownInput:focus {
    border-color: #66afe9;
}

.preview {
    flex: 1;
    min-height: 0;
    width: 100%;
    border: 1px solid #333;
    border-radius: 4px;
    padding: 18px;
    background-color: #2d2d2d;
    overflow-y: auto;
    line-height: 1.6;
    word-break: break-word;
}

.preview h1,
.preview h2,
.preview h3,
.preview h4,
.preview h5,
.preview h6 {
    color: #e8f3ff;
    margin: 0 0 12px;
}

.preview p,
.preview ul,
.preview ol,
.preview blockquote {
    margin: 0 0 12px;
}

.preview code {
    background-color: #1b1b1b;
    border: 1px solid #3a3a3a;
    border-radius: 4px;
    padding: 0.1em 0.3em;
    font-family: "Consolas", "Monaco", monospace;
}

.preview pre {
    background-color: #1b1b1b;
    border: 1px solid #3a3a3a;
    border-radius: 6px;
    padding: 12px;
    overflow-x: auto;
    margin: 0 0 12px;
}

.preview pre code {
    border: none;
    padding: 0;
    background: transparent;
}

.preview a {
    color: #66afe9;
}

.preview blockquote {
    padding-left: 12px;
    border-left: 3px solid #66afe9;
    color: #c8d6e5;
}

.html-panel {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}

.html-output {
    flex: 1;
    min-height: 0;
    width: 100%;
    resize: none;
    border: 1px solid #333;
    border-radius: 4px;
    padding: 12px;
    font-family: "Consolas", "Monaco", monospace;
    font-size: 12px;
    line-height: 1.5;
    outline: none;
    background-color: #2d2d2d;
    color: #f0f0f0;
    overflow: auto;
    white-space: pre;
}

.hidden {
    display: none;
}

@media (max-width: 900px) {
    .container {
        flex-direction: column;
        height: auto;
        min-height: 100vh;
    }

    .pane {
        min-height: 50vh;
        border-right: none;
        border-bottom: 1px solid #333;
    }

    .right-pane {
        border-bottom: none;
    }

    .pane-header {
        flex-wrap: wrap;
    }
}