:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-hover: #eceef2;
  --text: #1d2330;
  --muted: #667085;
  --border: #e2e5ea;
  --accent: #1f5fbf;
  --accent-soft: #e7effb;
  --danger: #b42318;
  --mark: #fff1a8;
  --callout: #f4f6fa;
  --code: #f2f4f7;
  --shadow: 0 8px 28px rgba(16, 24, 40, 0.14);
  --sidebar-w: 290px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181e;
    --bg-soft: #1b1f26;
    --bg-hover: #262b34;
    --text: #e6e8ec;
    --muted: #98a1b0;
    --border: #2d333d;
    --accent: #6ea2f2;
    --accent-soft: #1e2b40;
    --danger: #f97066;
    --mark: #5c4d00;
    --callout: #1f242c;
    --code: #222831;
    --shadow: 0 8px 28px rgba(0, 0, 0, 0.5);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button, input, select { font: inherit; color: inherit; }
.muted { color: var(--muted); }
.small { font-size: 12.5px; }
.pad { padding: 12px 16px; }
.booting { padding: 40px; color: var(--muted); }

/* buttons */
.btn {
  border: 1px solid var(--border); background: var(--bg); padding: 6px 12px; border-radius: 7px; cursor: pointer;
  white-space: nowrap;
}
.btn:hover { background: var(--bg-hover); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.danger { color: var(--danger); }
.btn:disabled { opacity: 0.6; cursor: default; }
.icon-btn { border: 0; background: transparent; cursor: pointer; padding: 4px 8px; border-radius: 6px; font-size: 16px; }
.icon-btn:hover { background: var(--bg-hover); }
button.link { border: 0; background: none; color: var(--accent); cursor: pointer; padding: 0; text-align: left; }

/* top bar */
.topbar {
  position: sticky; top: 0; z-index: 20; height: 56px; display: flex; align-items: center; gap: 14px;
  padding: 0 16px; background: var(--bg); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 650; color: var(--text); white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand img { width: 26px; height: 26px; }
.menu-toggle { display: none; }
.search-wrap { position: relative; flex: 1; max-width: 640px; }
#search {
  width: 100%; padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg-soft);
}
#search:focus { outline: 2px solid var(--accent); outline-offset: -1px; background: var(--bg); }
.search-results {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0; max-height: 70vh; overflow: auto;
  background: var(--bg); border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow); padding: 6px;
}
.result { display: block; padding: 8px 10px; border-radius: 7px; color: var(--text); }
.result:hover, .result.active { background: var(--accent-soft); text-decoration: none; }
.result-title { font-weight: 600; }
.result-path { color: var(--muted); font-size: 12.5px; }
.result-snippet { color: var(--muted); font-size: 13.5px; margin-top: 2px; }
.result mark { background: var(--mark); color: inherit; border-radius: 2px; padding: 0 1px; }
.result.all { color: var(--accent); font-size: 13.5px; }
.result.empty { color: var(--muted); }
.search-page .result { border-bottom: 1px solid var(--border); border-radius: 0; padding: 12px 4px; }

.user-menu { position: relative; margin-left: auto; }
.user-menu summary { list-style: none; cursor: pointer; padding: 6px 10px; border-radius: 7px; white-space: nowrap; }
.user-menu summary::-webkit-details-marker { display: none; }
.user-menu summary:hover { background: var(--bg-hover); }
.user-menu .menu {
  position: absolute; right: 0; top: calc(100% + 6px); min-width: 220px; display: flex; flex-direction: column; gap: 8px;
  background: var(--bg); border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow); padding: 12px 14px;
}

/* layout */
.layout { display: flex; height: calc(100vh - 56px); }
.sidebar {
  width: var(--sidebar-w); flex: none; border-right: 1px solid var(--border); background: var(--bg-soft);
  display: flex; flex-direction: column;
}
.sidebar-head {
  display: flex; align-items: center; justify-content: space-between; padding: 10px 12px 6px 16px;
  font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted);
}
#tree { overflow: auto; flex: 1; padding: 0 6px 24px; }
#tree ul { list-style: none; margin: 0; padding: 0; }
.tree-row {
  display: flex; align-items: center; gap: 2px; padding: 2px 6px 2px calc(4px + var(--depth) * 14px); border-radius: 6px;
}
.tree-row:hover { background: var(--bg-hover); }
.tree-row.active { background: var(--accent-soft); }
.tree-row.active .tree-link { color: var(--accent); font-weight: 600; }
.twisty, .twisty-spacer { width: 20px; flex: none; }
.twisty { border: 0; background: none; cursor: pointer; color: var(--muted); padding: 0; font-size: 12px; line-height: 22px; }
.tree-link {
  flex: 1; min-width: 0; color: var(--text); padding: 3px 2px; font-size: 14px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.tree-link:hover { text-decoration: none; }
main#main { flex: 1; overflow: auto; outline: none; }

/* page */
.page { max-width: 900px; margin: 0 auto; padding: 24px 40px 80px; }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 6px; font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb .sep { opacity: 0.6; }
.page-head { display: flex; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.page-head h1 { flex: 1; min-width: 260px; margin: 0; font-size: 30px; line-height: 1.25; }
.page-icon { margin-right: 10px; }
.page-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.meta { font-size: 13px; margin: 6px 0 20px; }
.banner { background: var(--mark); padding: 8px 12px; border-radius: 8px; margin-bottom: 12px; }
.subpages { margin-top: 36px; border-top: 1px solid var(--border); padding-top: 12px; }
.subpages h2 { font-size: 16px; }
.home .cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; margin-top: 20px; }
.card { border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; background: var(--bg); }
.card h2 { font-size: 17px; margin: 0 0 8px; }
.card ul { margin: 0; padding-left: 18px; font-size: 14px; }

/* page content (shared by view, history preview and editor) */
.content { overflow-wrap: anywhere; }
.content h1, .content h2, .content h3, .content h4 { line-height: 1.3; margin: 1.4em 0 0.4em; }
.content h2 { font-size: 23px; }
.content h3 { font-size: 19px; }
.content h4 { font-size: 16px; }
.content p { margin: 0.4em 0; }
.content img { max-width: 100%; height: auto; border-radius: 6px; }
.content ul, .content ol { padding-left: 26px; margin: 0.3em 0; }
.content li > p { margin: 0.15em 0; }
.content blockquote { margin: 0.6em 0; padding: 2px 14px; border-left: 3px solid var(--border); color: var(--muted); }
.content code { background: var(--code); padding: 1px 5px; border-radius: 4px; font-size: 0.92em; }
.content pre { background: var(--code); padding: 12px 14px; border-radius: 8px; overflow: auto; }
.content pre code { background: none; padding: 0; }
.content hr { border: 0; border-top: 1px solid var(--border); margin: 1.2em 0; }
.content table { border-collapse: collapse; margin: 0.8em 0; display: block; overflow-x: auto; max-width: 100%; }
.content th, .content td { border: 1px solid var(--border); padding: 6px 10px; vertical-align: top; min-width: 80px; }
.content th { background: var(--bg-soft); text-align: left; }
.content td > p, .content th > p { margin: 0; }
.content aside.callout {
  display: flex; gap: 10px; background: var(--callout); border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 14px; margin: 0.7em 0;
}
.content aside.callout::before { content: attr(data-icon); flex: none; }
.content aside.callout > div, .content aside.callout > p { flex: 1; }
.content details { margin: 0.4em 0; padding: 2px 0 2px 4px; }
.content details > summary { cursor: pointer; font-weight: 500; padding: 2px 0; }
.content details > div, .content details > [data-type="detailsContent"] { padding-left: 20px; }
.content ul[data-type="taskList"] { list-style: none; padding-left: 4px; }
.content ul[data-type="taskList"] li { display: flex; gap: 8px; align-items: flex-start; }
.content ul[data-type="taskList"] li > label { flex: none; margin-top: 2px; }
.content a.file { display: inline-block; padding: 4px 10px; border: 1px solid var(--border); border-radius: 7px; }

/* editor */
.edit-bar {
  position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 8px; background: var(--bg);
  padding: 10px 0; border-bottom: 1px solid var(--border); margin-bottom: 12px;
}
.spacer { flex: 1; }
.title-row { display: flex; gap: 8px; margin-bottom: 8px; }
.title-input { flex: 1; font-size: 28px; font-weight: 700; border: 0; border-bottom: 1px solid var(--border); padding: 4px 2px; background: transparent; }
.icon-input { width: 56px; font-size: 24px; text-align: center; border: 1px solid var(--border); border-radius: 8px; background: transparent; }
.title-input:focus, .icon-input:focus { outline: none; border-color: var(--accent); }
.toolbar {
  position: sticky; top: 55px; z-index: 4; display: flex; flex-wrap: wrap; gap: 2px; padding: 6px; background: var(--bg-soft);
  border: 1px solid var(--border); border-radius: 8px; margin-bottom: 10px;
}
.toolbar button, .toolbar select {
  border: 0; background: transparent; padding: 4px 8px; border-radius: 5px; cursor: pointer; min-width: 30px;
}
.toolbar button:hover, .toolbar select:hover { background: var(--bg-hover); }
.toolbar button.on { background: var(--accent-soft); color: var(--accent); }
.toolbar .sep { width: 1px; background: var(--border); margin: 2px 4px; }
.ProseMirror { min-height: 50vh; outline: none; padding: 4px 2px 40px; }
.ProseMirror p.is-editor-empty:first-child::before { content: attr(data-placeholder); color: var(--muted); float: left; height: 0; pointer-events: none; }
.ProseMirror .selectedCell { background: var(--accent-soft); }
.ProseMirror img.ProseMirror-selectednode { outline: 2px solid var(--accent); }
.ProseMirror details > summary { cursor: text; }
.ProseMirror [data-type="details"] { display: flex; gap: 4px; margin: 0.4em 0; }
.ProseMirror [data-type="details"] > button { border: 0; background: none; cursor: pointer; color: var(--muted); }
.ProseMirror [data-type="details"] > div { flex: 1; }
.ProseMirror [data-type="details"]:not(.is-open) > div > [data-type="detailsContent"] { display: none; }

/* dialogs */
.dialog { border: 1px solid var(--border); border-radius: 12px; padding: 0; width: min(560px, 94vw); background: var(--bg); color: var(--text); box-shadow: var(--shadow); }
.dialog.wide { width: min(1100px, 96vw); }
.dialog::backdrop { background: rgba(10, 14, 20, 0.45); }
.dialog-head { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--border); }
.dialog-head h2 { font-size: 17px; margin: 0; }
.dialog-body { padding: 14px 16px; max-height: 75vh; overflow: auto; }
input.full { width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); margin-bottom: 10px; }
.pick-list { display: flex; flex-direction: column; gap: 2px; }
.pick { display: flex; flex-direction: column; align-items: flex-start; border: 0; background: none; padding: 7px 10px; border-radius: 7px; cursor: pointer; text-align: left; }
.pick:hover { background: var(--accent-soft); }
.history { display: grid; grid-template-columns: 300px 1fr; gap: 16px; min-height: 50vh; }
.history-list { display: flex; flex-direction: column; gap: 2px; border-right: 1px solid var(--border); padding-right: 10px; }
.history-item { display: flex; flex-direction: column; align-items: flex-start; gap: 1px; border: 0; background: none; text-align: left; padding: 7px 10px; border-radius: 7px; cursor: pointer; }
.history-item:hover { background: var(--bg-hover); }
.history-item.active { background: var(--accent-soft); }
.history-preview-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 8px; }
.tag { font-size: 11px; background: var(--accent-soft); color: var(--accent); border-radius: 10px; padding: 0 8px; }

/* admin */
.table-wrap { overflow-x: auto; }
table.grid { border-collapse: collapse; width: 100%; font-size: 14px; }
table.grid th, table.grid td { border-bottom: 1px solid var(--border); padding: 8px 10px; text-align: left; }
table.grid select { padding: 3px 6px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg); }
ul.changes { padding-left: 18px; font-size: 14px; }

/* login */
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; background: var(--bg-soft); }
.login-card { width: min(420px, 100%); background: var(--bg); border: 1px solid var(--border); border-radius: 14px; padding: 28px; box-shadow: var(--shadow); }
.login-card h1 { margin: 8px 0 4px; font-size: 24px; }
.login-logo { width: 40px; height: 40px; }
.login-card form { display: flex; flex-direction: column; gap: 10px; margin-top: 16px; }
.login-card input { padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); }
.login-msg { min-height: 1.5em; font-size: 14px; }
.login-msg.error { color: var(--danger); }

/* toast */
.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translate(-50%, 20px); opacity: 0; transition: all 0.25s;
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 8px; z-index: 100; max-width: 90vw;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.error { background: var(--danger); color: #fff; }

/* narrow screens */
@media (max-width: 860px) {
  .menu-toggle { display: block; }
  .brand { display: none; }
  .sidebar {
    position: fixed; top: 56px; bottom: 0; left: 0; z-index: 15; transform: translateX(-100%); transition: transform 0.2s;
    box-shadow: var(--shadow); width: min(var(--sidebar-w), 86vw);
  }
  body.nav-open .sidebar { transform: none; }
  .page { padding: 16px 16px 60px; }
  .page-head h1 { font-size: 24px; min-width: 0; }
  .history { grid-template-columns: 1fr; }
  .history-list { border-right: 0; border-bottom: 1px solid var(--border); padding: 0 0 10px; max-height: 30vh; overflow: auto; }
  .user-menu summary { max-width: 120px; overflow: hidden; text-overflow: ellipsis; }
}