:root {
  --bg: #ffffff;
  --side: #f7f7f5;
  --hover: rgba(55, 53, 47, 0.07);
  --active: rgba(55, 53, 47, 0.12);
  --text: #37352f;
  --muted: #8a8780;
  --border: rgba(55, 53, 47, 0.12);
  --accent: #2383e2;
  --link: #2383e2;
  --wiki-bg: rgba(35, 131, 226, 0.09);
  --code-bg: rgba(135, 131, 120, 0.15);
  --block-bg: #f7f6f3;
  --mark: #fbf3db;
  --popup: #ffffff;
  --shadow: 0 0 0 1px rgba(15, 15, 15, 0.05), 0 3px 6px rgba(15, 15, 15, 0.1), 0 9px 24px rgba(15, 15, 15, 0.2);
  --danger: #eb5757;
  --sans: 'Inter', ui-sans-serif, -apple-system, 'Segoe UI', Helvetica, Arial, sans-serif;
  --serif: 'Lora', Georgia, 'Times New Roman', serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}
:root[data-theme='dark'] {
  --bg: #191919;
  --side: #202020;
  --hover: rgba(255, 255, 255, 0.055);
  --active: rgba(255, 255, 255, 0.1);
  --text: #e6e6e3;
  --muted: #9b9a97;
  --border: rgba(255, 255, 255, 0.1);
  --link: #529cca;
  --wiki-bg: rgba(82, 156, 202, 0.16);
  --code-bg: rgba(255, 255, 255, 0.08);
  --block-bg: #252525;
  --mark: rgba(255, 212, 0, 0.18);
  --popup: #252525;
  --shadow: 0 0 0 1px rgba(255, 255, 255, 0.08), 0 3px 6px rgba(0, 0, 0, 0.3), 0 9px 24px rgba(0, 0, 0, 0.5);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  display: flex; background: var(--bg); color: var(--text);
  font: 15px/1.5 var(--sans); -webkit-font-smoothing: antialiased;
}
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input { font: inherit; color: inherit; }
kbd { font: 11px var(--sans); color: var(--muted); margin-left: auto; }
.muted { color: var(--muted); }
.pad { padding: 8px 14px; font-size: 13px; }

/* ---------- sidebar ---------- */
#sidebar {
  width: 260px; flex: none; background: var(--side); border-right: 1px solid var(--border);
  height: 100vh; overflow-y: auto; padding: 8px 6px 40px; user-select: none;
}
.side-head { display: flex; align-items: center; gap: 2px; padding: 6px 8px 10px; }
.brand { font-weight: 600; flex: 1; }
.icon-btn { width: 28px; height: 28px; border-radius: 6px; display: inline-grid; place-items: center; color: var(--muted); font-size: 16px; }
.icon-btn:hover { background: var(--hover); color: var(--text); }
.side-btn {
  display: flex; align-items: center; width: 100%; text-align: left; padding: 5px 10px;
  border-radius: 6px; color: var(--muted); font-size: 14px; font-weight: 500;
}
.side-btn:hover { background: var(--hover); color: var(--text); }
.side-label { font-size: 12px; font-weight: 600; color: var(--muted); padding: 18px 10px 4px; border-radius: 6px; }
.side-label.drop { background: var(--wiki-bg); }
#tree { min-height: 60px; }
.row {
  display: flex; align-items: center; gap: 4px; height: 30px; padding-right: 4px;
  border-radius: 6px; cursor: pointer; font-size: 14px; color: var(--text);
}
.row:hover { background: var(--hover); }
.row.active { background: var(--active); font-weight: 500; }
.row.drop { background: var(--wiki-bg); box-shadow: inset 0 0 0 2px var(--accent); }
.empty-row { color: var(--muted); font-size: 13px; cursor: default; }
.empty-row:hover { background: none; }
.caret { width: 16px; flex: none; color: var(--muted); font-size: 11px; transition: transform 0.12s; text-align: center; }
.caret.open { transform: rotate(90deg); }
.row-icon { flex: none; width: 20px; text-align: center; font-size: 14px; }
.row-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row-actions { display: none; }
.row:hover .row-actions { display: flex; }
.row-actions button { width: 22px; height: 22px; border-radius: 4px; color: var(--muted); font-size: 13px; }
.row-actions button:hover { background: var(--active); color: var(--text); }

/* ---------- main ---------- */
#main { flex: 1; height: 100vh; overflow-y: auto; min-width: 0; }
.topbar {
  position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 10px;
  height: 46px; padding: 0 12px; background: var(--bg);
}
.crumbs { display: flex; gap: 6px; font-size: 14px; color: var(--muted); overflow: hidden; white-space: nowrap; min-width: 0; }
.crumb.last { color: var(--text); overflow: hidden; text-overflow: ellipsis; }
.sep { opacity: 0.5; }
.status { font-size: 12px; color: var(--muted); margin-left: auto; white-space: nowrap; }
.top-actions { display: flex; }

.dropdown { position: relative; }
.dropdown summary { list-style: none; cursor: pointer; }
.dropdown summary::-webkit-details-marker { display: none; }
.dropdown-menu {
  background: var(--popup); box-shadow: var(--shadow); border-radius: 8px; padding: 6px; min-width: 220px; z-index: 50;
}
.dropdown .dropdown-menu { position: absolute; right: 0; top: 34px; }
.ctx { position: fixed; min-width: 190px; }
.dd-label { font-size: 12px; color: var(--muted); padding: 4px 8px; }
.dd-row, .dd-btn {
  display: flex; align-items: center; gap: 8px; width: 100%; text-align: left; padding: 6px 8px;
  border-radius: 5px; font-size: 14px; color: var(--text); text-decoration: none; cursor: pointer;
}
.dd-row:hover, .dd-btn:hover { background: var(--hover); }
.dd-btn.danger { color: var(--danger); }
.dropdown-menu hr { border: 0; border-top: 1px solid var(--border); margin: 6px 0; }
.fonts { display: flex; gap: 4px; padding: 2px 4px 8px; }
.font-btn {
  flex: 1; display: flex; flex-direction: column; align-items: center; padding: 6px 0; border-radius: 6px;
  border: 1px solid transparent; color: var(--muted);
}
.font-btn span { font-size: 22px; color: var(--text); }
.font-btn small { font: 11px var(--sans); }
.font-btn:hover { background: var(--hover); }
.font-btn.on { border-color: var(--accent); }
.font-btn.on small { color: var(--accent); }
.f-sans span { font-family: var(--sans); }
.f-serif span { font-family: var(--serif); }
.f-mono span { font-family: var(--mono); font-size: 19px; }

/* ---------- page ---------- */
.page { max-width: 760px; margin: 0 auto; padding: 48px 56px 30vh; --font: var(--sans); font-family: var(--font); }
.page.wide { max-width: none; padding-left: 96px; padding-right: 96px; }
.page.font-serif { --font: var(--serif); }
.page.font-mono { --font: var(--mono); }
.page.font-mono .tiptap { font-size: 14.5px; }
.page.small .tiptap { font-size: 14px; }
.page-head { margin-bottom: 8px; }
.page-icon { font-size: 64px; line-height: 1; padding: 4px; border-radius: 8px; margin-left: -4px; }
.page-icon:hover { background: var(--hover); }
.title {
  display: block; width: 100%; border: 0; outline: 0; background: none; padding: 8px 0 4px;
  font: 700 40px/1.2 var(--font); letter-spacing: -0.01em; color: var(--text);
}
.title::placeholder { color: var(--muted); opacity: 0.5; }

.tiptap { outline: none; font-size: 16px; line-height: 1.65; caret-color: var(--text); }
.tiptap > * + * { margin-top: 2px; }
.tiptap p { margin: 0; padding: 3px 0; }
.tiptap h1, .tiptap h2, .tiptap h3 { font-weight: 650; line-height: 1.3; margin: 1.4em 0 0.3em; letter-spacing: -0.005em; }
.tiptap h1 { font-size: 1.875em; }
.tiptap h2 { font-size: 1.5em; }
.tiptap h3 { font-size: 1.25em; }
.tiptap > :first-child { margin-top: 0; }
.tiptap a { color: var(--link); text-decoration: underline; text-decoration-color: color-mix(in srgb, var(--link) 40%, transparent); text-underline-offset: 2px; cursor: pointer; }
.tiptap strong { font-weight: 650; }
.tiptap mark { background: var(--mark); color: inherit; padding: 0 2px; border-radius: 3px; }
.tiptap code {
  font-family: var(--mono); font-size: 0.85em; background: var(--code-bg); color: #eb5757;
  padding: 0.15em 0.35em; border-radius: 4px;
}
.tiptap pre {
  font-family: var(--mono); font-size: 14px; line-height: 1.55; background: var(--block-bg);
  padding: 16px 20px; border-radius: 6px; margin: 8px 0; overflow-x: auto; tab-size: 2;
}
.tiptap pre code { background: none; color: inherit; padding: 0; font-size: inherit; }
.tiptap blockquote { margin: 6px 0; padding: 2px 0 2px 16px; border-left: 3px solid currentColor; }
.tiptap hr { border: 0; border-top: 1px solid var(--border); margin: 18px 0; }
.tiptap hr.ProseMirror-selectednode { border-top-color: var(--accent); }
.tiptap ul, .tiptap ol { padding-left: 1.6em; margin: 2px 0; }
.tiptap li > p { padding: 1px 0; }
.tiptap img { max-width: 100%; border-radius: 6px; display: block; margin: 10px 0; }
.tiptap img.ProseMirror-selectednode { outline: 3px solid var(--accent); }
.tiptap ul[data-type='taskList'] { list-style: none; padding-left: 2px; }
.tiptap ul[data-type='taskList'] li { display: flex; gap: 8px; align-items: flex-start; }
.tiptap ul[data-type='taskList'] li > label { flex: none; margin-top: 6px; }
.tiptap ul[data-type='taskList'] li > label input { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; margin: 0; }
.tiptap ul[data-type='taskList'] li > div { flex: 1; }
.tiptap ul[data-type='taskList'] li[data-checked='true'] > div { color: var(--muted); text-decoration: line-through; }
.tiptap p.is-empty::before, .tiptap h1.is-empty::before, .tiptap h2.is-empty::before, .tiptap h3.is-empty::before {
  content: attr(data-placeholder); float: left; height: 0; pointer-events: none; color: var(--muted); opacity: 0.6;
}
.tiptap :not(.is-editor-empty).is-empty:not(:focus-within)::before { content: none; }
.tiptap p.is-editor-empty::before { content: attr(data-placeholder); }
.tiptap li p.is-empty::before { content: none; }
.wikilink {
  color: var(--link); background: var(--wiki-bg); border-radius: 4px; padding: 1px 2px; cursor: pointer; font-weight: 500;
}
.wikilink:hover { text-decoration: underline; }

.backlinks { margin-top: 64px; border-top: 1px solid var(--border); padding-top: 14px; }
.backlinks:empty { display: none; }
.backlinks h4 { margin: 0 0 8px; font: 600 13px var(--sans); color: var(--muted); }
.backlink { display: block; padding: 8px 10px; border-radius: 6px; color: var(--text); text-decoration: none; font-family: var(--sans); }
.backlink:hover { background: var(--hover); }
.backlink b { font-weight: 500; font-size: 14px; }
.backlink small { display: block; color: var(--muted); font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- menus ---------- */
.bubble {
  position: absolute; visibility: hidden; display: flex; background: var(--popup); box-shadow: var(--shadow); border-radius: 7px; padding: 3px; z-index: 40;
  font-family: var(--sans);
}
.bubble .bb { min-width: 30px; height: 30px; padding: 0 6px; border-radius: 4px; font-size: 14px; font-weight: 600; }
.bubble .bb:hover { background: var(--hover); }
.bubble .bb.on { color: var(--accent); background: var(--wiki-bg); }
.bb-1 { font-style: italic; } .bb-2 { text-decoration: underline; } .bb-3 { text-decoration: line-through; }
.bb-4 { font-family: var(--mono); font-size: 12px !important; }

.popup-menu {
  position: fixed; z-index: 60; width: 290px; max-height: 320px; overflow-y: auto;
  background: var(--popup); box-shadow: var(--shadow); border-radius: 8px; padding: 6px;
}
.menu-item { display: flex; align-items: center; gap: 10px; width: 100%; text-align: left; padding: 5px 8px; border-radius: 5px; }
.menu-item.active { background: var(--hover); }
.menu-icon {
  flex: none; width: 34px; height: 34px; display: grid; place-items: center; border: 1px solid var(--border);
  border-radius: 6px; font-size: 14px; font-weight: 600; background: var(--bg);
}
.menu-text { display: flex; flex-direction: column; min-width: 0; }
.menu-text b { font-weight: 500; font-size: 14px; }
.menu-text small { color: var(--muted); font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.menu-empty { padding: 8px; color: var(--muted); font-size: 13px; }

.icon-picker { position: fixed; z-index: 60; background: var(--popup); box-shadow: var(--shadow); border-radius: 8px; padding: 8px; width: 290px; }
.icon-grid { display: grid; grid-template-columns: repeat(8, 1fr); gap: 2px; margin-bottom: 8px; }
.icon-grid button { font-size: 20px; height: 32px; border-radius: 5px; }
.icon-grid button:hover { background: var(--hover); }
.icon-picker input, .qs input, .login input {
  width: 100%; border: 1px solid var(--border); background: var(--bg); border-radius: 6px; padding: 7px 10px; outline: none;
}
.icon-picker input:focus, .login input:focus { border-color: var(--accent); }

.qs-backdrop { position: fixed; inset: 0; background: rgba(15, 15, 15, 0.45); z-index: 80; display: flex; justify-content: center; padding-top: 12vh; }
.qs { width: min(620px, calc(100% - 32px)); background: var(--popup); border-radius: 10px; box-shadow: var(--shadow); overflow: hidden; align-self: flex-start; }
.qs input { border: 0; border-bottom: 1px solid var(--border); border-radius: 0; padding: 16px 18px; font-size: 17px; background: none; }
.qs-list { max-height: 50vh; overflow-y: auto; padding: 6px; }
.qs-item { display: flex; gap: 10px; align-items: center; width: 100%; text-align: left; padding: 8px 12px; border-radius: 6px; }
.qs-item.active { background: var(--hover); }
.qs-text { display: flex; flex-direction: column; min-width: 0; }
.qs-text b { font-weight: 500; }
.qs-text small { color: var(--muted); font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); background: #2f2f2f; color: #fff;
  padding: 9px 16px; border-radius: 8px; font-size: 14px; z-index: 100; box-shadow: var(--shadow);
}

/* ---------- empty + login ---------- */
.empty { text-align: center; padding: 18vh 24px; }
.empty-icon { font-size: 56px; }
.empty h2 { margin: 8px 0 4px; }
.empty p { color: var(--muted); }
.empty .muted { font-size: 13px; margin-top: 28px; }
.primary, .login button {
  background: var(--accent); color: #fff; border-radius: 6px; padding: 8px 16px; font-weight: 500;
}
.primary:hover, .login button:hover { filter: brightness(1.08); }
.login { margin: auto; width: min(320px, calc(100% - 32px)); display: flex; flex-direction: column; gap: 12px; text-align: center; }
.login h1 { margin: 0 0 8px; font-size: 24px; }
.login-logo { font-size: 48px; }
.login-err { color: var(--danger); font-size: 14px; min-height: 20px; }

/* ---------- mobile ---------- */
.mobile-only, .nav-scrim { display: none; }
@media (max-width: 760px) {
  .mobile-only { display: inline-grid; }
  #sidebar { position: fixed; z-index: 70; left: 0; top: 0; transform: translateX(-100%); transition: transform 0.2s; width: 280px; }
  body.nav-open #sidebar { box-shadow: var(--shadow); }
  body.nav-open #sidebar { transform: none; }
  body.nav-open .nav-scrim { display: block; position: fixed; inset: 0; z-index: 65; background: rgba(0, 0, 0, 0.3); }
  .page, .page.wide { padding: 24px 16px 40vh; }
  .title { font-size: 32px; }
  .page-icon { font-size: 48px; }
  .row-actions { display: flex; }
}