:root {
  --bg: #ffffff;
  --bg-soft: #f5f6f8;
  --fg: #1d2430;
  --muted: #687385;
  --border: #dde1e7;
  --accent: #2f6fde;
  --accent-fg: #ffffff;
  --danger: #c23b3b;
  --warn-bg: #fff4d6;
  --warn-fg: #6b4e00;
  --code-bg: #f0f2f5;
  --topbar: 48px;
  --sidebar: 280px;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16191e;
    --bg-soft: #1e2228;
    --fg: #e3e6ea;
    --muted: #98a2b0;
    --border: #323842;
    --accent: #6d9cf0;
    --accent-fg: #0d1320;
    --danger: #ef7070;
    --warn-bg: #3d3214;
    --warn-fg: #f3d68a;
    --code-bg: #232830;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
}

a { color: var(--accent); }

button, .button {
  font: inherit;
  font-size: 0.9rem;
  color: var(--fg);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}
button:hover, .button:hover { border-color: var(--muted); }
button.primary, .button.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
button.danger { color: var(--danger); }
button.icon { border: none; background: none; font-size: 1.2rem; padding: 0.2rem 0.5rem; }
button:disabled { opacity: 0.5; cursor: default; }

input, textarea {
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.6rem;
}

/* Layout */

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--topbar);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 0.5rem;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}
.brand { font-weight: 600; color: var(--fg); text-decoration: none; }
.search { flex: 1; display: flex; justify-content: center; min-width: 0; }
.search input { width: 100%; max-width: 28rem; padding: 0.25rem 0.6rem; }
.status { font-size: 0.8rem; color: var(--muted); white-space: nowrap; }
.status.offline, .status.error { color: var(--danger); }

#sidebar {
  position: fixed;
  top: var(--topbar);
  bottom: 0;
  left: 0;
  width: var(--sidebar);
  overflow: auto;
  border-right: 1px solid var(--border);
  background: var(--bg-soft);
  padding: 0.5rem 0;
}

main {
  min-height: calc(100vh - var(--topbar));
  margin: var(--topbar) 0 0 var(--sidebar);
  padding: 1rem 1.5rem 3rem;
  max-width: calc(var(--sidebar) + 60rem);
}

@media (max-width: 600px) {
  .brand { display: none; }
  .status:not(.offline):not(.error) { display: none; }
}

@media (max-width: 800px) {
  #sidebar { transform: translateX(-100%); transition: transform 0.2s; z-index: 5; width: min(85vw, var(--sidebar)); }
  body.sidebar-open #sidebar { transform: none; box-shadow: 0 0 20px rgb(0 0 0 / 0.3); }
  main { margin-left: 0; padding: 1rem; }
}
@media (min-width: 801px) {
  #menu-button { display: none; }
}

/* Tree */

.sidebar-actions { display: flex; gap: 0.3rem; padding: 0 0.5rem 0.5rem; border-bottom: 1px solid var(--border); margin-bottom: 0.4rem; }
.sidebar-actions button { flex: 1; justify-content: center; padding: 0.25rem 0.4rem; }

#tree ul { list-style: none; margin: 0; padding: 0 0 0 0.9rem; }
#tree > ul { padding-left: 0.3rem; }
#tree summary { list-style: none; cursor: pointer; }
#tree summary::-webkit-details-marker { display: none; }
.row { display: flex; align-items: center; border-radius: 4px; padding-right: 0.2rem; }
.row:hover, .row.active { background: var(--border); }
.row > a, .row > span {
  flex: 1;
  min-width: 0;
  padding: 0.15rem 0.4rem;
  color: var(--fg);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.row .more { opacity: 0; font-size: 0.9rem; padding: 0 0.4rem; }
.row:hover .more, .row.active .more, .row .more:focus { opacity: 1; }
@media (hover: none) { .row .more { opacity: 1; } }
.dir > summary > .row > span::before { content: "▸ " / ""; color: var(--muted); }
.dir[open] > summary > .row > span::before { content: "▾ " / ""; }
.file .row > a::before { content: "· " / ""; color: var(--muted); }
.file.binary .row > a { color: var(--muted); }
.badge { font-size: 0.75rem; margin-left: 0.25rem; }
.badge.conflict { color: var(--danger); }
.badge.pending { color: var(--accent); }

/* Content */

.page-header { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; margin-bottom: 1rem; }
.page-header h1 { font-size: 1.1rem; margin: 0 auto 0 0; word-break: break-all; }
.page-header h1 .dir { color: var(--muted); font-weight: normal; }
.banner { background: var(--warn-bg); color: var(--warn-fg); padding: 0.5rem 0.75rem; border-radius: 6px; margin-bottom: 1rem; }
.banner a { color: inherit; font-weight: 600; }
.empty { color: var(--muted); }

.markdown { overflow-wrap: break-word; }
.markdown img { max-width: 100%; }
.markdown pre, .markdown code { background: var(--code-bg); border-radius: 4px; font-size: 0.9em; }
.markdown pre { padding: 0.75rem; overflow: auto; }
.markdown code { padding: 0.1em 0.3em; }
.markdown pre code { padding: 0; }
.markdown blockquote { margin-left: 0; padding-left: 1rem; border-left: 3px solid var(--border); color: var(--muted); }
.markdown table { border-collapse: collapse; }
.markdown th, .markdown td { border: 1px solid var(--border); padding: 0.3rem 0.6rem; }

.preview-image { max-width: 100%; max-height: 70vh; display: block; margin-bottom: 1rem; }

/* Search */

.results { list-style: none; padding: 0; margin: 0; }
.results li { padding: 0.5rem 0; border-bottom: 1px solid var(--border); }
.results a { font-weight: 600; word-break: break-all; }
.match { font-size: 0.9rem; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.match .line { font-variant-numeric: tabular-nums; }
mark { background: var(--warn-bg); color: var(--warn-fg); border-radius: 2px; }

/* Editor */

.save-state { font-size: 0.8rem; color: var(--muted); }
.tabs { display: flex; flex-wrap: wrap; align-items: center; gap: 0.25rem; border-bottom: 1px solid var(--border); padding-bottom: 0.4rem; margin-bottom: 0.5rem; }
.tab { border: none; background: none; }
.tab.active { font-weight: 600; text-decoration: underline; text-underline-offset: 6px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 0.2rem; margin-left: auto; }
.toolbar button { min-width: 2.2rem; justify-content: center; }
.editor {
  display: block;
  width: 100%;
  min-height: calc(100vh - var(--topbar) - 9rem);
  resize: vertical;
  font: 0.95rem/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  tab-size: 4;
}
.preview { min-height: 50vh; }

/* Resolve */

.resolve { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.pane { display: flex; flex-direction: column; gap: 0.5rem; min-width: 0; }
.pane h2 { font-size: 1rem; margin: 0; display: flex; flex-direction: column; }
.pane h2 small { font-weight: normal; color: var(--muted); word-break: break-all; }
.pane .editor { min-height: 50vh; }
.pane button { align-self: flex-start; }
@media (max-width: 900px) { .resolve { grid-template-columns: 1fr; } }

/* Login, dialog, toasts */

#login {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: var(--bg);
  z-index: 20;
}
#login form, dialog form { display: flex; flex-direction: column; gap: 0.75rem; min-width: min(20rem, 90vw); }
#login h1 { margin: 0; text-align: center; }
label { display: flex; flex-direction: column; gap: 0.25rem; font-size: 0.9rem; }
.error { color: var(--danger); margin: 0; min-height: 1.5em; }

dialog { border: 1px solid var(--border); border-radius: 8px; background: var(--bg); color: var(--fg); padding: 1.25rem; }
dialog::backdrop { background: rgb(0 0 0 / 0.4); }
dialog h2 { font-size: 1.1rem; margin: 0; }
dialog p { margin: 0; }
dialog .buttons { display: flex; justify-content: flex-end; gap: 0.5rem; flex-wrap: wrap; }
/* A dialog with only buttons is an action menu. */
dialog h2 + .buttons { flex-direction: column; align-items: stretch; }
dialog h2 + .buttons button { justify-content: center; }
dialog h2 + .buttons button[value="cancel"] { order: 1; }

#toasts { position: fixed; bottom: 1rem; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; gap: 0.5rem; z-index: 30; }
.toast { background: var(--fg); color: var(--bg); padding: 0.5rem 1rem; border-radius: 6px; box-shadow: 0 2px 8px rgb(0 0 0 / 0.2); }
.toast.error { background: var(--danger); color: #fff; }