:root {
  --bg: #f6f7f9; --panel: #ffffff; --panel-2: #f1f3f6; --border: #dde1e7; --text: #1d2330; --muted: #69727f;
  --accent: #2563eb; --accent-2: #1d4ed8; --accent-soft: #e6eefe; --danger: #c62828; --ok: #1e7e34; --warn: #a15c00;
  --add-bg: #e6f6ea; --add-fg: #135d22; --del-bg: #fdecec; --del-fg: #9b1c1c;
  --mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas, monospace;
  --radius: 7px; --shadow: 0 8px 30px rgba(15, 23, 42, .14);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12151b; --panel: #1a1e26; --panel-2: #222733; --border: #2f3542; --text: #e3e7ee; --muted: #9099a8;
    --accent: #5b8def; --accent-2: #7aa2f7; --accent-soft: #1f2b45; --danger: #ef5350; --ok: #5cc06f; --warn: #e0a243;
    --add-bg: #15301d; --add-fg: #8fe0a0; --del-bg: #3a1a1c; --del-fg: #ff9f9f; --shadow: 0 8px 30px rgba(0, 0, 0, .5);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #12151b; --panel: #1a1e26; --panel-2: #222733; --border: #2f3542; --text: #e3e7ee; --muted: #9099a8;
  --accent: #5b8def; --accent-2: #7aa2f7; --accent-soft: #1f2b45; --danger: #ef5350; --ok: #5cc06f; --warn: #e0a243;
  --add-bg: #15301d; --add-fg: #8fe0a0; --del-bg: #3a1a1c; --del-fg: #ff9f9f; --shadow: 0 8px 30px rgba(0, 0, 0, .5);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg); color: var(--text); font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: flex; flex-direction: column; overflow: hidden;
}
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.hint { color: var(--muted); font-size: 12px; }
.pad { padding: 4px 8px 6px; margin: 0; }
.pad-lg { padding: 12px 16px; }
.row { display: flex; gap: 6px; align-items: center; }
.spacer { flex: 1; }
.grow { flex: 1; min-height: 0; }
.err { color: var(--danger); font-size: 12px; min-height: 1em; margin: 6px 0 0; white-space: pre-wrap; }
code { font-family: var(--mono); font-size: .92em; }

/* ---------- nút ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px; height: 32px; padding: 0 12px; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--panel); color: var(--text); font: inherit; cursor: pointer; white-space: nowrap;
  text-decoration: none;
}
.btn:hover:not(:disabled) { border-color: var(--accent); }
.btn:disabled { opacity: .45; cursor: default; }
.btn:focus-visible, .select:focus-visible, .input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.btn.primary:hover:not(:disabled) { background: var(--accent-2); }
.btn.danger { color: var(--danger); }
.btn.icon { width: 34px; padding: 0; justify-content: center; }
.btn.sm { height: 28px; padding: 0 9px; font-size: 13px; }
.btn.xs { height: 24px; padding: 0 8px; font-size: 12px; }
.btn.on { background: var(--accent-soft); border-color: var(--accent); }
.linkbtn { background: none; border: 0; color: var(--warn); cursor: pointer; font: inherit; padding: 0; text-decoration: underline; }
.count:not(:empty) { background: var(--accent-soft); color: var(--accent); border-radius: 9px; padding: 0 6px; font-size: 11px; font-weight: 600; }
.badge { font-size: 11px; padding: 1px 7px; border-radius: 9px; background: var(--panel-2); border: 1px solid var(--border); color: var(--muted); }
.select, .input {
  height: 28px; border: 1px solid var(--border); background: var(--panel); color: var(--text); border-radius: 6px; font: inherit; font-size: 13px; padding: 0 6px;
}
.input { width: 100%; padding: 0 8px; height: 30px; }
.spinner { display: none; width: 14px; height: 14px; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: spin .7s linear infinite; }
.busy > .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- thanh trên ---------- */
.topbar { display: flex; align-items: center; gap: 8px; padding: 8px 12px; background: var(--panel); border-bottom: 1px solid var(--border); }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; }
.logo { background: var(--accent); color: #fff; border-radius: 7px; padding: 3px 7px; font-size: 13px; }
.url-wrap { flex: 1; min-width: 0; }
#url-input { width: 100%; height: 34px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); color: var(--text); padding: 0 12px; font-size: 13px; }
#url-input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
#url-input.local { color: var(--accent); }

.options { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; padding: 7px 12px; background: var(--panel); border-bottom: 1px solid var(--border); }
.options[hidden] { display: none; }
.opt-group { display: inline-flex; align-items: center; gap: 6px; }
.opt-label { color: var(--muted); font-size: 12px; }
.sep { width: 1px; height: 20px; background: var(--border); }
.chain { display: inline-flex; gap: 4px; flex-wrap: wrap; align-items: center; font-size: 12px; }
.chip { font-family: var(--mono); font-size: 11px; padding: 1px 7px; border-radius: 9px; border: 1px solid var(--border); background: var(--panel-2); }
.chip.internal { border-style: dashed; color: var(--muted); }
.chip.unsaved::after { content: " •"; color: var(--warn); }
.chain .arrow { color: var(--muted); }

/* ---------- menu ---------- */
.menu-wrap { position: relative; }
.menu {
  position: absolute; top: calc(100% + 6px); left: 0; z-index: 30; width: 360px; max-width: calc(100vw - 24px);
  background: var(--panel); border: 1px solid var(--border); border-radius: 9px; box-shadow: var(--shadow); padding: 6px;
}
.menu.right { left: auto; right: 0; width: 330px; }
.menu-item { display: flex; gap: 9px; align-items: flex-start; padding: 7px 8px; border-radius: 6px; cursor: pointer; width: 100%;
  background: none; border: 0; color: inherit; font: inherit; text-align: left; }
.menu-item:hover { background: var(--panel-2); }
.menu-item input { margin-top: 3px; }
.menu-item small { display: block; color: var(--muted); font-size: 12px; margin-top: 2px; }
.menu-sep { height: 1px; background: var(--border); margin: 5px 2px; }
.menu-foot { display: flex; justify-content: flex-end; padding: 4px 4px 2px; }

/* ---------- thanh tiến độ tải pandoc ---------- */
.loadbar { position: relative; height: 22px; background: var(--panel-2); border-bottom: 1px solid var(--border); font-size: 12px; }
.loadbar-fill { position: absolute; inset: 0 auto 0 0; width: 0; background: var(--accent-soft); transition: width .2s; }
.loadbar span { position: relative; padding: 0 12px; line-height: 22px; color: var(--muted); }

/* ---------- vùng làm việc ---------- */
.workspace { flex: 1; display: flex; min-height: 0; }
.pane { display: flex; flex-direction: column; min-width: 0; min-height: 0; background: var(--panel); }
#source-pane, #preview-pane { flex: 1 1 50%; }
.pane-head { display: flex; align-items: center; gap: 8px; padding: 5px 10px; border-bottom: 1px solid var(--border); min-height: 38px; flex-wrap: wrap; }
.pane-title { font-weight: 600; }
.splitter { flex: 0 0 5px; cursor: col-resize; background: var(--border); }
.splitter:hover, .splitter.drag { background: var(--accent); }
.view-source #preview-pane, .view-source .splitter { display: none; }
.view-preview #source-pane, .view-preview .splitter { display: none; }
.editor-host { flex: 1; min-height: 0; position: relative; }
.editor-host .CodeMirror, .lua-editor .CodeMirror { position: absolute; inset: 0; height: auto; font-family: var(--mono); font-size: 13px; }
.CodeMirror { background: var(--panel); color: var(--text); }
.CodeMirror-gutters { background: var(--panel-2); border-right: 1px solid var(--border); }
.CodeMirror-linenumber { color: var(--muted); }
.CodeMirror-cursor { border-left-color: var(--text); }
.CodeMirror-activeline-background { background: var(--panel-2); }
.CodeMirror-selected, .CodeMirror-focused .CodeMirror-selected { background: var(--accent-soft) !important; }
.CodeMirror-dialog { background: var(--panel-2); color: var(--text); }
.cm-header { color: var(--accent); }
.cm-comment { color: var(--muted); }
.cm-keyword { color: #a626a4; }
.cm-string { color: #50a14f; }
.cm-variable-2, .cm-link { color: var(--accent); }
.cm-url { color: var(--muted); }
.cm-error-line { background: var(--del-bg) !important; }

.tabs { display: inline-flex; border: 1px solid var(--border); border-radius: 7px; overflow: hidden; }
.tabs button { border: 0; background: var(--panel); color: var(--muted); padding: 4px 11px; font: inherit; font-size: 13px; cursor: pointer; display: inline-flex; gap: 5px; align-items: center; }
.tabs button + button { border-left: 1px solid var(--border); }
.tabs button.on { background: var(--accent-soft); color: var(--text); font-weight: 600; }

/* ---------- xem trước ---------- */
.preview { flex: 1; overflow: auto; padding: 22px 30px 60px; line-height: 1.65; overflow-wrap: anywhere; }
.preview[hidden] { display: none; }
.preview .empty { color: var(--muted); max-width: 520px; margin: 60px auto; text-align: center; }
.preview img { max-width: 100%; height: auto; }
.preview img.broken { outline: 1px dashed var(--danger); min-width: 40px; min-height: 24px; }
.preview pre { background: var(--panel-2); border: 1px solid var(--border); border-radius: 6px; padding: 10px 12px; overflow: auto; font-size: 13px; }
.preview pre code.hljs { background: none; padding: 0; }
.preview :not(pre) > code { background: var(--panel-2); padding: 1px 4px; border-radius: 4px; }
.preview table { border-collapse: collapse; margin: 1em 0; display: block; overflow: auto; }
.preview th, .preview td { border: 1px solid var(--border); padding: 4px 8px; }
.preview blockquote { margin: 1em 0; padding: 0 1em; border-left: 3px solid var(--border); color: var(--muted); }
.preview a { color: var(--accent); }
.preview .katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; }
.preview .math.raw { font-family: var(--mono); color: var(--warn); }
.preview div.sourceCode, .preview .output { margin: 1em 0; }

/* ---------- diff ---------- */
.diff-summary { padding: 7px 12px; border-bottom: 1px solid var(--border); font-size: 13px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.diff-summary .add { color: var(--add-fg); } .diff-summary .del { color: var(--del-fg); }
.diff { flex: 1; overflow: auto; font-family: var(--mono); font-size: 12.5px; }
.diff .ln { display: grid; grid-template-columns: 48px 48px 18px 1fr; white-space: pre-wrap; word-break: break-word; }
.diff .ln > span:nth-child(-n+2) { color: var(--muted); text-align: right; padding-right: 8px; user-select: none; }
.diff .ln.add { background: var(--add-bg); color: var(--add-fg); }
.diff .ln.del { background: var(--del-bg); color: var(--del-fg); }
.diff .ln.gap { color: var(--muted); background: var(--panel-2); grid-template-columns: 1fr; padding: 2px 12px; font-style: italic; }
.diff .empty, .ext-list .empty { color: var(--muted); padding: 24px; text-align: center; font-family: system-ui, sans-serif; }

/* ---------- thanh trạng thái ---------- */
.statusbar { display: flex; align-items: center; gap: 12px; padding: 4px 10px; background: var(--panel); border-top: 1px solid var(--border); font-size: 12px; min-height: 32px; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.seg button { border: 0; background: var(--panel); color: var(--muted); padding: 3px 9px; font: inherit; cursor: pointer; }
.seg button + button { border-left: 1px solid var(--border); }
.seg button.on { background: var(--accent-soft); color: var(--text); }
.msg { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.msg.error { color: var(--danger); } .msg.ok { color: var(--ok); }
#stats { color: var(--muted); }

.drawer {
  position: fixed; left: 12px; right: 12px; bottom: 40px; z-index: 40; max-height: 45vh; display: flex; flex-direction: column;
  background: var(--panel); border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow);
}
.drawer[hidden] { display: none; }
.drawer h4 { margin: 0; padding: 8px 12px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.drawer pre { margin: 0; padding: 10px 12px; overflow: auto; white-space: pre-wrap; font-size: 12.5px; }
.drawer.error h4 { color: var(--danger); }

.drop-overlay { position: fixed; inset: 0; z-index: 60; background: rgba(37, 99, 235, .12); border: 3px dashed var(--accent); display: grid; place-items: center; pointer-events: none; }
.drop-overlay[hidden] { display: none; }
.drop-overlay div { background: var(--panel); padding: 14px 22px; border-radius: 10px; font-weight: 600; box-shadow: var(--shadow); }

/* ---------- hộp thoại ---------- */
.modal {
  border: 1px solid var(--border); border-radius: 12px; padding: 0; background: var(--panel); color: var(--text); box-shadow: var(--shadow);
  width: min(760px, calc(100vw - 24px)); max-height: calc(100vh - 40px);
}
.modal[open] { display: flex; flex-direction: column; }
.modal.narrow { width: min(480px, calc(100vw - 24px)); }
.modal.wide { width: min(1240px, calc(100vw - 24px)); height: calc(100vh - 40px); }
.modal::backdrop { background: rgba(10, 14, 22, .45); }
.modal form { display: contents; }
.dlg-head { display: flex; align-items: center; gap: 12px; padding: 10px 14px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.dlg-head h3 { margin: 0; font-size: 16px; }
.dlg-foot { display: flex; align-items: center; gap: 8px; padding: 9px 14px; border-top: 1px solid var(--border); }
.format-line { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 12px; color: var(--accent); }

.ext-tools { display: flex; gap: 10px; align-items: center; padding: 9px 14px; border-bottom: 1px solid var(--border); }
.ext-list { overflow: auto; flex: 1; min-height: 120px; max-height: 60vh; }
.ext-row { display: grid; grid-template-columns: 22px 230px 1fr; gap: 8px; align-items: center; padding: 6px 14px; border-bottom: 1px solid var(--panel-2); cursor: pointer; }
.ext-row:hover { background: var(--panel-2); }
.ext-row .n { font-family: var(--mono); font-size: 12.5px; }
.ext-row .d { color: var(--muted); font-size: 12px; }
.ext-row.changed .n { color: var(--accent); font-weight: 600; }
.ext-row.changed .n::after { content: " ●"; font-size: 9px; vertical-align: middle; }
.pick-row { display: block; width: 100%; text-align: left; background: none; border: 0; border-bottom: 1px solid var(--panel-2); padding: 9px 14px; color: inherit; font: inherit; cursor: pointer; }
.pick-row:hover { background: var(--panel-2); }

/* ---------- Lua ---------- */
.lua-body { flex: 1; display: flex; min-height: 0; }
.lua-side { flex: 0 0 250px; border-right: 1px solid var(--border); overflow: auto; display: flex; flex-direction: column; }
.lua-side .sec { display: flex; justify-content: space-between; align-items: center; gap: 6px; padding: 9px 10px 5px; font-size: 11px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); font-weight: 600; flex-wrap: wrap; }
.lua-list { display: flex; flex-direction: column; gap: 2px; padding: 0 6px; min-height: 30px; }
.lua-list.enabled { padding-bottom: 6px; border-bottom: 1px solid var(--border); }
.lua-item { display: flex; align-items: center; gap: 6px; padding: 5px 6px; border-radius: 6px; cursor: pointer; font-family: var(--mono); font-size: 12.5px; border: 1px solid transparent; }
.lua-item:hover { background: var(--panel-2); }
.lua-item.active { background: var(--accent-soft); border-color: var(--accent); }
.lua-item .nm { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lua-item .ord { color: var(--muted); font-size: 11px; width: 14px; text-align: right; }
.lua-item .grip { cursor: grab; color: var(--muted); }
.lua-item.dirty .nm::after { content: " •"; color: var(--warn); }
.lua-item.internal { color: var(--muted); font-style: italic; }
.lua-item.dragging { opacity: .4; }
.lua-item.drop-before { box-shadow: inset 0 2px 0 var(--accent); }
.lua-list .empty { color: var(--muted); font-size: 12px; padding: 6px; font-family: system-ui, sans-serif; }
.lua-trash { padding: 6px 10px; font-size: 12px; }
.lua-trash button { background: none; border: 0; color: var(--accent); cursor: pointer; font: inherit; padding: 0; text-decoration: underline; }
.lua-main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.lua-toolbar { display: flex; align-items: center; gap: 6px; padding: 7px 10px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.lua-toolbar .fname { font-family: var(--mono); font-weight: 600; }
.lua-editor { flex: 1 1 55%; position: relative; min-height: 120px; }
.lua-result { flex: 1 1 45%; border-top: 1px solid var(--border); min-height: 120px; }
.lua-result .out { flex: 1; margin: 0; overflow: auto; padding: 10px 12px; font-size: 12.5px; white-space: pre-wrap; }
.lua-result .out[hidden], .pane[hidden] { display: none; }
.log-err { color: var(--danger); }
.lua-readonly { padding: 10px 12px; background: var(--panel-2); border-bottom: 1px solid var(--border); font-size: 13px; }

.hide-sm {}
@media (max-width: 760px) {
  .hide-sm { display: none !important; }
  .topbar { flex-wrap: wrap; }
  .url-wrap { order: 10; flex-basis: 100%; }
  .workspace { flex-direction: column; }
  .splitter { display: none !important; }
  .preview { padding: 16px; }
  .lua-body { flex-direction: column; }
  .lua-side { flex: 0 0 180px; border-right: 0; border-bottom: 1px solid var(--border); }
  .ext-row { grid-template-columns: 22px 1fr; }
  .ext-row .d { grid-column: 2; }
}
.msg.warn { color: var(--warn); }