:root {
  --tb-h: 44px;
  --sb-h: 26px;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, monospace;
  --font-read: Georgia, "Iowan Old Style", "Palatino Linotype", serif;
}

html[data-theme="dark"] {
  --bg: #1e1e2e;
  --bg-alt: #181825;
  --bg-elev: #313244;
  --fg: #cdd6f4;
  --fg-dim: #a6adc8;
  --fg-faint: #6c7086;
  --border: #313244;
  --accent: #89b4fa;
  --accent-soft: #45475a;
  --code-bg: #181825;
  --sel: #45475a;
}

html[data-theme="light"] {
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --bg-elev: #eceff4;
  --fg: #2e3440;
  --fg-dim: #4c566a;
  --fg-faint: #9aa4b2;
  --border: #e2e6eb;
  --accent: #1e66f5;
  --accent-soft: #dbe5ff;
  --code-bg: #f2f4f7;
  --sel: #cfe0ff;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  font-family: var(--font-ui);
  color: var(--fg);
  background: var(--bg);
}

#app {
  display: grid;
  grid-template-rows: var(--tb-h) 1fr var(--sb-h);
  height: 100vh;
}

/* ---------------- Toolbar ---------------- */
#toolbar {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 10px;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  user-select: none;
  -webkit-app-region: drag;
}
#toolbar button { -webkit-app-region: no-drag; }

.tb-group { display: flex; gap: 2px; }
.tb-sep { width: 1px; height: 22px; background: var(--border); margin: 0 6px; }
.tb-spacer { flex: 1; }

#toolbar button {
  min-width: 30px;
  height: 30px;
  padding: 0 8px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--fg-dim);
  font-size: 13px;
  font-family: var(--font-ui);
  cursor: pointer;
  transition: background .12s, color .12s;
}
#toolbar button:hover { background: var(--bg-elev); color: var(--fg); }
#toolbar button:active { transform: translateY(1px); }
.view-switch button.active { background: var(--accent-soft); color: var(--accent); }

/* ---------------- Workspace ---------------- */
#workspace {
  display: flex;
  min-height: 0;
  overflow: hidden;
}

#outline {
  width: 240px;
  flex: 0 0 240px;
  background: var(--bg-alt);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 12px 0;
}
#outline[hidden] { display: none; }
.outline-title {
  padding: 4px 16px 10px;
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--fg-faint);
}
#outline-list a {
  display: block;
  padding: 4px 16px;
  color: var(--fg-dim);
  text-decoration: none;
  font-size: 13px;
  cursor: pointer;
  border-left: 2px solid transparent;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
#outline-list a:hover { background: var(--bg-elev); color: var(--fg); border-left-color: var(--accent); }
#outline-list a.lvl-1 { font-weight: 600; }
#outline-list a.lvl-2 { padding-left: 28px; }
#outline-list a.lvl-3 { padding-left: 40px; }
#outline-list a.lvl-4, #outline-list a.lvl-5, #outline-list a.lvl-6 { padding-left: 52px; font-size: 12px; }

#editor-pane, #preview-pane { min-width: 0; height: 100%; overflow: hidden; }
#editor-pane { flex: 1; display: flex; }
#preview-pane { flex: 1; overflow-y: auto; background: var(--bg); }

#gutter { width: 1px; background: var(--border); flex: 0 0 1px; }

/* View modes */
#app[data-view="editor"] #preview-pane,
#app[data-view="editor"] #gutter { display: none; }
#app[data-view="preview"] #editor-pane,
#app[data-view="preview"] #gutter { display: none; }
#app[data-view="preview"] #preview-pane { max-width: none; }

/* ---------------- CodeMirror ---------------- */
.cm-editor { height: 100%; width: 100%; font-family: var(--font-mono); font-size: 14.5px; }
.cm-scroller { line-height: 1.7; padding: 24px 8px; }
.cm-content { max-width: 820px; margin: 0 auto; width: 100%; }
.cm-focused { outline: none; }
.cm-editor .cm-gutters { background: transparent; border: none; color: var(--fg-faint); }

/* ---------------- Preview / markdown-body ---------------- */
.markdown-body {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 48px 120px;
  font-family: var(--font-read);
  font-size: 17px;
  line-height: 1.75;
  color: var(--fg);
}
.markdown-body h1, .markdown-body h2, .markdown-body h3,
.markdown-body h4, .markdown-body h5, .markdown-body h6 {
  font-family: var(--font-ui);
  line-height: 1.25;
  margin: 1.6em 0 .6em;
  scroll-margin-top: 16px;
}
.markdown-body h1 { font-size: 2em; border-bottom: 1px solid var(--border); padding-bottom: .3em; }
.markdown-body h2 { font-size: 1.5em; border-bottom: 1px solid var(--border); padding-bottom: .25em; }
.markdown-body h3 { font-size: 1.25em; }
.markdown-body p { margin: 0 0 1em; }
.markdown-body a { color: var(--accent); text-decoration: none; }
.markdown-body a:hover { text-decoration: underline; }
.markdown-body img { max-width: 100%; border-radius: 6px; }
.markdown-body blockquote {
  margin: 0 0 1em;
  padding: .2em 1.1em;
  border-left: 4px solid var(--accent);
  color: var(--fg-dim);
  background: var(--bg-alt);
  border-radius: 0 6px 6px 0;
}
.markdown-body code {
  font-family: var(--font-mono);
  font-size: .88em;
  background: var(--code-bg);
  padding: .15em .4em;
  border-radius: 4px;
}
.markdown-body pre {
  background: var(--code-bg);
  padding: 16px 18px;
  border-radius: 8px;
  overflow-x: auto;
  border: 1px solid var(--border);
}
.markdown-body pre code { background: none; padding: 0; font-size: .85em; line-height: 1.6; }
.markdown-body ul, .markdown-body ol { padding-left: 1.6em; margin: 0 0 1em; }
.markdown-body li { margin: .25em 0; }
.markdown-body li.task-list-item { list-style: none; }
.markdown-body li.task-list-item input { margin-right: .5em; }
.markdown-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 0 0 1em;
  font-family: var(--font-ui);
  font-size: .92em;
}
.markdown-body th, .markdown-body td { border: 1px solid var(--border); padding: 8px 12px; }
.markdown-body th { background: var(--bg-alt); }
.markdown-body tr:nth-child(2n) td { background: var(--bg-alt); }
.markdown-body hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }
.markdown-body kbd {
  font-family: var(--font-mono);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: .1em .4em;
  font-size: .8em;
}
.markdown-body .footnotes { font-size: .9em; color: var(--fg-dim); border-top: 1px solid var(--border); margin-top: 2em; }
.markdown-body .header-anchor { color: var(--fg-faint); text-decoration: none; margin-left: .3em; opacity: 0; }
.markdown-body h1:hover .header-anchor, .markdown-body h2:hover .header-anchor,
.markdown-body h3:hover .header-anchor { opacity: 1; }

/* highlight.js token colours (theme-aware, minimal) */
.hljs-comment, .hljs-quote { color: var(--fg-faint); font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-literal { color: #cba6f7; }
.hljs-string, .hljs-attr { color: #a6e3a1; }
.hljs-number, .hljs-built_in { color: #fab387; }
.hljs-title, .hljs-section, .hljs-function .hljs-title { color: var(--accent); }
.hljs-attribute, .hljs-name, .hljs-tag { color: #f9e2af; }
html[data-theme="light"] .hljs-keyword { color: #8839ef; }
html[data-theme="light"] .hljs-string { color: #40a02b; }
html[data-theme="light"] .hljs-number, html[data-theme="light"] .hljs-built_in { color: #fe640b; }

/* ---------------- Status bar ---------------- */
#statusbar {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 14px;
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--fg-faint);
  user-select: none;
}
.status-spacer { flex: 1; }
#status-file { color: var(--fg-dim); }
#status-file.dirty::after { content: " •"; color: var(--accent); }

/* Custom scrollbars */
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-thumb { background: var(--accent-soft); border-radius: 6px; border: 3px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--fg-faint); }
::-webkit-scrollbar-track { background: transparent; }