:root {
  --bg: #faf8f3;
  --panel: #f1eee6;
  --line: #ddd8cc;
  --ink: #26241f;
  --muted: #7c776c;
  --accent: #c43e32;
  --accent-soft: #f6e3e0;
  --ok: #3b7a57;
  --warn: #b7791f;
  --font: "Noto Serif CJK TC", "Noto Serif TC", "Source Han Serif TC", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --ui: -apple-system, "Segoe UI", "Hiragino Sans", "Noto Sans CJK TC", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1b19; --panel: #262521; --line: #3a3832; --ink: #e8e4da;
    --muted: #9a958a; --accent: #e0695c; --accent-soft: #3d2825; --ok: #6cbf8f; --warn: #d9a04b;
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg); color: var(--ink); font-family: var(--ui);
  display: flex; flex-direction: column; overflow: hidden;
  padding-top: env(safe-area-inset-top);
}
button { font: inherit; color: inherit; cursor: pointer; }
input, textarea, select { font: inherit; color: inherit; }
.hidden { display: none !important; }
.muted { color: var(--muted); font-size: 13px; }
.spacer { flex: 1; }

.topbar {
  display: flex; align-items: center; gap: 6px; padding: 6px 10px;
  border-bottom: 1px solid var(--line); background: var(--bg); flex: 0 0 auto;
}
.topbar-title { font-weight: 600; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.topbar-actions { display: flex; gap: 2px; }
.icon-btn {
  background: none; border: none; border-radius: 8px; width: 36px; height: 36px;
  font-size: 17px; display: inline-flex; align-items: center; justify-content: center;
}
.icon-btn:hover { background: var(--panel); }
.pill {
  border: 1px solid var(--line); background: var(--panel); border-radius: 999px;
  padding: 4px 10px; font-size: 12px; white-space: nowrap;
}
.pill.ok { color: var(--ok); }
.pill.warn { color: var(--warn); }
.pill.err { color: var(--accent); border-color: var(--accent); }
.pill.busy { opacity: .7; }

.layout { flex: 1; display: flex; min-height: 0; position: relative; }
.sidebar {
  width: 280px; flex: 0 0 auto; background: var(--panel); border-right: 1px solid var(--line);
  display: flex; flex-direction: column; min-height: 0;
}
.sidebar-head { display: flex; gap: 4px; padding: 8px; }
.sidebar-head select {
  flex: 1; min-width: 0; padding: 6px 8px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg);
}
.progress { padding: 0 12px 8px; font-size: 12px; color: var(--muted); }
.progress .bar { height: 4px; background: var(--line); border-radius: 2px; margin-top: 4px; overflow: hidden; }
.progress .bar i { display: block; height: 100%; background: var(--ok); }
.chapters { list-style: none; margin: 0; padding: 0; overflow-y: auto; flex: 1; }
.chapters li {
  display: flex; align-items: center; gap: 6px; padding: 8px 6px 8px 12px;
  border-top: 1px solid var(--line); cursor: pointer; user-select: none;
}
.chapters li.active { background: var(--bg); }
.chapters li.dragover { border-top: 2px solid var(--accent); }
.chapters .ch-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 14px; }
.chapters .ch-count { font-size: 11px; color: var(--muted); white-space: nowrap; }
.chapters .ch-flag { font-size: 11px; }
.chapters .ch-menu { opacity: .5; width: 28px; height: 28px; font-size: 14px; }
.chapters li:hover .ch-menu { opacity: 1; }
.btn-add { margin: 8px; padding: 8px; border: 1px dashed var(--line); background: none; border-radius: 8px; color: var(--muted); }
.btn-add:hover { color: var(--ink); border-color: var(--ink); }

.editor { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.empty { margin: auto; text-align: center; color: var(--muted); }
.editor-inner { flex: 1; display: flex; flex-direction: column; min-height: 0; max-width: 860px; width: 100%; margin: 0 auto; }
.conflict-bar { background: var(--accent-soft); color: var(--accent); padding: 8px 16px; font-size: 13px; display: flex; gap: 10px; align-items: center; }
.chapter-head { display: flex; align-items: center; padding: 10px 16px 0; }
#chapter-title { flex: 1; border: none; background: none; font-size: 18px; font-weight: 600; padding: 6px 0; outline: none; font-family: var(--font); }
#editor {
  flex: 1; border: none; outline: none; background: none; resize: none;
  padding: 12px 16px 40px; font-family: var(--font); font-size: 17px; line-height: 1.9;
  tab-size: 2;
}
.preview { flex: 1; overflow-y: auto; padding: 12px 16px 40px; font-family: var(--font); font-size: 17px; line-height: 1.9; }
.preview p { margin: 0 0 1em; }
.preview hr { border: none; border-top: 1px solid var(--line); margin: 1.5em 0; }
.preview blockquote { margin: 0 0 1em; padding-left: 1em; border-left: 3px solid var(--line); color: var(--muted); }
.bottombar {
  display: flex; align-items: center; gap: 8px; padding: 6px 12px; border-top: 1px solid var(--line);
  font-size: 12px; color: var(--muted); padding-bottom: calc(6px + env(safe-area-inset-bottom));
}
.symbols { margin-left: auto; display: flex; gap: 2px; }
.symbols button { background: none; border: 1px solid var(--line); border-radius: 6px; padding: 2px 8px; font-size: 13px; color: var(--ink); }
.symbols button:hover { background: var(--panel); }

.btn { border: 1px solid var(--line); background: var(--panel); border-radius: 8px; padding: 8px 14px; font-size: 14px; }
.btn:hover { border-color: var(--ink); }
.btn.primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn.danger { color: var(--accent); }
.btn.small { padding: 4px 10px; font-size: 12px; }
.btn:disabled { opacity: .4; cursor: default; }

.modal { position: fixed; inset: 0; background: rgba(0,0,0,.35); display: flex; align-items: center; justify-content: center; z-index: 50; padding: 12px; }
.modal-box { background: var(--bg); border-radius: 14px; width: 100%; max-width: 480px; max-height: 92vh; display: flex; flex-direction: column; padding: 14px 16px; box-shadow: 0 20px 60px rgba(0,0,0,.3); }
.modal-box.wide { max-width: 900px; }
.modal-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.modal-head h2 { font-size: 16px; margin: 0; flex: 1; }
.modal-head .spacer + .btn { margin-right: 4px; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 8px; }
.row input[type=text], .row input:not([type]) { flex: 1; min-width: 120px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); }
.row.opts { font-size: 13px; gap: 14px; }
.stack { display: flex; flex-direction: column; gap: 10px; }
.stack label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.stack label input { padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); color: var(--ink); }
.stack hr { border: none; border-top: 1px solid var(--line); width: 100%; }
.results { overflow-y: auto; flex: 1; min-height: 120px; font-size: 13px; }
.results h4 { margin: 10px 0 4px; font-size: 13px; color: var(--muted); }
.results .hit { padding: 4px 8px; border-radius: 6px; cursor: pointer; font-family: var(--font); white-space: pre-wrap; }
.results .hit:hover { background: var(--panel); }
.results .hit mark { background: #ffe58a; color: #26241f; }

.versions-body { display: flex; gap: 12px; min-height: 0; flex: 1; }
.version-list { list-style: none; margin: 0; padding: 0; width: 220px; flex: 0 0 auto; overflow-y: auto; border-right: 1px solid var(--line); }
.version-list li { padding: 8px; border-radius: 6px; cursor: pointer; font-size: 13px; }
.version-list li:hover, .version-list li.active { background: var(--panel); }
.version-list .v-reason { font-size: 11px; color: var(--muted); }
.version-view { flex: 1; overflow-y: auto; font-family: var(--font); font-size: 14px; line-height: 1.7; white-space: pre-wrap; }
.version-view .del { background: rgba(196,62,50,.18); text-decoration: line-through; }
.version-view .add { background: rgba(59,122,87,.18); }
.version-view .v-actions { margin-bottom: 8px; display: flex; gap: 8px; font-family: var(--ui); }

.work-list { list-style: none; margin: 0 0 10px; padding: 0; }
.work-list li { display: flex; align-items: center; gap: 8px; padding: 8px 4px; border-bottom: 1px solid var(--line); font-size: 14px; }
.work-list .w-title { flex: 1; }
.work-list .w-meta { font-size: 11px; color: var(--muted); }

.conflict-cols { display: flex; gap: 10px; flex: 1; min-height: 0; margin-bottom: 10px; }
.conflict-cols > div { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.conflict-cols h3 { font-size: 13px; margin: 0 0 4px; color: var(--muted); }
.conflict-cols textarea { flex: 1; min-height: 240px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); padding: 8px; font-family: var(--font); font-size: 14px; resize: none; }

.ctx-menu { position: fixed; z-index: 40; background: var(--bg); border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 8px 24px rgba(0,0,0,.2); display: flex; flex-direction: column; min-width: 110px; padding: 4px; }
.ctx-menu button { background: none; border: none; text-align: left; padding: 8px 12px; border-radius: 6px; font-size: 14px; }
.ctx-menu button:hover { background: var(--panel); }
.ctx-menu button:disabled { opacity: .35; }
.ctx-menu button:last-child { color: var(--accent); }

.toast { position: fixed; bottom: 70px; left: 50%; transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: 8px 14px; border-radius: 999px; font-size: 13px; z-index: 60; max-width: 90vw; }

.scrim { display: none; }
@media (max-width: 760px) {
  .sidebar { position: absolute; left: 0; top: 0; bottom: 0; z-index: 20; transform: translateX(-100%); transition: transform .2s; width: min(300px, 85vw); }
  .sidebar.open { transform: none; }
  .scrim { display: none; position: absolute; inset: 0; background: rgba(0,0,0,.3); z-index: 15; }
  .scrim.open { display: block; }
  .chapters .ch-menu { opacity: 1; }
  .topbar-actions .icon-btn { width: 32px; }
  #editor, .preview { font-size: 16px; padding: 10px 14px 30px; }
  .conflict-cols { flex-direction: column; }
  .versions-body { flex-direction: column; }
  .version-list { width: auto; max-height: 160px; border-right: none; border-bottom: 1px solid var(--line); }
}