:root {
    --bg: #ffffff;
    --text: #24292f;
    --text-secondary: #636c76;
    --banner-bg: #f6f8fa;
    --border: #d0d7de;
    --code-bg: #f6f8fa;
    --btn-bg: #ffffff;
    --btn-hover: #f3f4f6;
    --btn-active: #ebecf0;
    --link: #0969da;
    --scrollbar-thumb: #c1c7cd;
    --scrollbar-track: transparent;
}

@media (prefers-color-scheme: dark) {
    :root {
    --bg: #0d1117;
    --text: #e6edf3;
    --text-secondary: #8b949e;
    --banner-bg: #161b22;
    --border: #30363d;
    --code-bg: #161b22;
    --btn-bg: #21262d;
    --btn-hover: #30363d;
    --btn-active: #3a424b;
    --link: #58a6ff;
    --scrollbar-thumb: #484f58;
    --scrollbar-track: transparent;
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    display: flex;
    flex-direction: column;
    height: 100vh;
}

#banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    background: var(--banner-bg);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

#file-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-right: 12px;
}

#banner-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

button {
    padding: 4px 12px;
    font-size: 12px;
    font-weight: 500;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--btn-bg);
    color: var(--text);
    cursor: pointer;
    white-space: nowrap;
}

button:hover { background: var(--btn-hover); }
button:active { background: var(--btn-active); }

#content-area {
    flex: 1;
    overflow-y: auto;
    padding: 24px 32px;
}

/* Scrollbar theming */
#content-area::-webkit-scrollbar { width: 8px; }
#content-area::-webkit-scrollbar-track { background: var(--scrollbar-track); }
#content-area::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}

/* Rendered markdown styles */
#rendered h1, #rendered h2, #rendered h3, #rendered h4, #rendered h5, #rendered h6 {
    margin-top: 24px;
    margin-bottom: 16px;
    font-weight: 600;
    line-height: 1.25;
}
#rendered h1 { font-size: 2em; padding-bottom: 0.3em; border-bottom: 1px solid var(--border); }
#rendered h2 { font-size: 1.5em; padding-bottom: 0.3em; border-bottom: 1px solid var(--border); }
#rendered h3 { font-size: 1.25em; }
#rendered p { margin-bottom: 16px; line-height: 1.6; }
#rendered ul, #rendered ol { margin-bottom: 16px; padding-left: 2em; }
#rendered li { margin-bottom: 4px; line-height: 1.6; }
#rendered code {
    background: var(--code-bg);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 85%;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}
#rendered pre {
    background: var(--code-bg);
    padding: 16px;
    border-radius: 6px;
    overflow-x: auto;
    margin-bottom: 16px;
}
#rendered pre code { background: none; padding: 0; font-size: 85%; }
#rendered blockquote {
    padding: 0 1em;
    color: var(--text-secondary);
    border-left: 0.25em solid var(--border);
    margin-bottom: 16px;
}
#rendered table {
    border-collapse: collapse;
    margin-bottom: 16px;
    width: auto;
}
#rendered th, #rendered td {
    padding: 6px 13px;
    border: 1px solid var(--border);
}
#rendered th { font-weight: 600; background: var(--code-bg); }
#rendered img { max-width: 100%; }
#rendered a { color: var(--link); text-decoration: none; }
#rendered a:hover { text-decoration: underline; }
#rendered hr { border: none; border-top: 1px solid var(--border); margin: 24px 0; }

/* Source view */
#source {
    display: none;
    white-space: pre-wrap;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 13px;
    line-height: 1.5;
    color: var(--text);
}

/* Empty state */
#empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
}

#empty-state p { font-size: 16px; margin-bottom: 12px; }