:root {
  --bg: #1b2733;
  --panel: #ffffff;
  --panel-2: #f5f7fa;
  --ink: #243240;
  --muted: #6b7785;
  --line: #e4e8ee;

  /* ---- pastel palette ---- */
  --accent: #7eb0d5;        /* soft blue  — primary accent      */
  --accent-d: #5f9bc9;      /* darker blue — borders / hover    */
  --accent-soft: #eaf2f9;   /* light blue tint — hover surfaces */
  --accent-ink: #103049;    /* dark text that sits on a pastel  */
  --lilac: #bd7ebe;         /* secondary accent                 */
  --lilac-soft: #f4eaf4;
  --lime: #b2e061;          /* status: ok      */
  --orange: #ffb55a;        /* status: busy    */
  --coral: #fd7f6f;         /* status: error   */
  --pink: #fdcce5;          /* small details   */

  --ui-font: "Inter", "Helvetica Neue", -apple-system, "Segoe UI", Arial, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", Consolas, monospace;

  --topbar-h: 50px;
  --head-h: 34px;
  font-size: 14px;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: var(--ui-font);
  color: var(--ink);
  background: var(--panel-2);
  overflow: hidden;
}
button { font-family: inherit; cursor: pointer; }

/* ---------- Top bar ---------- */
.topbar {
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  background: linear-gradient(180deg, #33485c, #283a4b);
  color: #eef4f9;
  border-bottom: 1px solid #1c2a37;
}
.brand { display: flex; align-items: center; gap: 9px; }
.logo {
  width: 28px; height: 28px; border-radius: 7px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--lilac));
  color: #fff; font-size: 18px; font-weight: 700;
}
.brand .name { font-weight: 700; font-size: 16px; letter-spacing: .2px; }
.brand .thin { font-weight: 300; opacity: .85; margin-left: 1px; }
.brand .tag {
  font-size: 10px; text-transform: uppercase; letter-spacing: .08em;
  background: rgba(253,204,229,.22); border: 1px solid rgba(253,204,229,.5);
  color: #fde0ee; padding: 2px 7px; border-radius: 20px; margin-left: 4px;
}

.toolbar { display: flex; align-items: center; gap: 10px; }
.engine { font-size: 12px; color: #cddce8; display: flex; align-items: center; gap: 6px; }
.engine select {
  font-family: inherit; font-size: 13px; padding: 4px 8px; border-radius: 6px;
  border: 1px solid #3c5266; background: #22323f; color: #eef4f9;
}
.btn {
  font-size: 13px; padding: 6px 12px; border-radius: 7px;
  border: 1px solid rgba(255,255,255,.25); background: rgba(255,255,255,.08); color: #eef4f9;
}
.btn:hover { background: rgba(255,255,255,.16); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.btn.primary:hover { background: #6aa6d0; border-color: #6aa6d0; }
.btn .ic { font-size: 11px; }
.status {
  font-size: 12px; padding: 4px 10px; border-radius: 20px;
  border: 1px solid transparent; min-width: 84px; text-align: center;
}
.status.idle { color: #cdd9e3; background: rgba(255,255,255,.10); }
.status.busy { color: #5a3a06; background: var(--orange); }
.status.ok   { color: #2a4209; background: var(--lime); }
.status.err  { color: #5a1a10; background: var(--coral); }

/* ---------- Workspace ---------- */
.workspace {
  height: calc(100% - var(--topbar-h));
  display: grid;
  grid-template-columns: 248px 6px 1fr 6px 1fr;
}
.pane { background: var(--panel); display: flex; flex-direction: column; min-width: 0; overflow: hidden; }
.pane.files { background: var(--panel-2); border-right: 1px solid var(--line); }
.pane.editor { border-right: 1px solid var(--line); }
.pane-head {
  height: var(--head-h); flex: 0 0 var(--head-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 12px; font-size: 12px; font-weight: 600; color: var(--muted);
  background: var(--panel-2); border-bottom: 1px solid var(--line);
  text-transform: uppercase; letter-spacing: .04em;
}
.pane.editor .pane-head, .pane.preview .pane-head { background: #fbfcfe; }
.pane-actions { display: flex; gap: 6px; }
.mini, .tabbtn {
  font-size: 11px; padding: 3px 8px; border-radius: 5px; border: 1px solid var(--line);
  background: #fff; color: var(--accent-d); font-weight: 600; text-transform: none; letter-spacing: 0;
}
.mini:hover { background: var(--accent-soft); }
.tabbtn { color: var(--muted); }
.tabbtn.active { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

/* ---------- File tree ---------- */
.tree { list-style: none; margin: 0; padding: 6px 4px; overflow: auto; flex: 1; }
.tree, .tree ul { list-style: none; }
.tree ul { margin: 0; padding-left: 14px; }
.row {
  display: flex; align-items: center; gap: 6px;
  padding: 3px 6px; border-radius: 6px; cursor: pointer; font-size: 13px; user-select: none;
  position: relative;
}
.row:hover { background: var(--accent-soft); }
.row.active { background: var(--accent); color: var(--accent-ink); }
.row.active .twisty, .row.active .rowicon { color: var(--accent-ink); }
.twisty { width: 12px; font-size: 10px; color: var(--muted); text-align: center; }
.rowicon { width: 15px; text-align: center; color: var(--accent-d); }
.rowname { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.rowactions { display: none; gap: 2px; }
.row:hover .rowactions { display: flex; }
.rowactions button {
  border: none; background: transparent; font-size: 12px; padding: 0 3px; border-radius: 4px;
  color: inherit; opacity: .7;
}
.rowactions button:hover { opacity: 1; background: rgba(0,0,0,.10); }
.files-hint { font-size: 10.5px; color: var(--muted); padding: 8px 12px; border-top: 1px solid var(--line); }

/* ---------- Editor ---------- */
.editor-host { flex: 1; min-height: 0; overflow: hidden; }
.cm-editor { height: 100%; font-size: 13.5px; }
.cm-editor .cm-scroller { font-family: var(--mono); line-height: 1.55; }
.cm-focused { outline: none !important; }
.cm-gutters { background: #f7f9fc !important; border-right: 1px solid var(--line) !important; color: #aab6c2 !important; }
.cm-activeLine { background: #eef5fb !important; }
.cm-activeLineGutter { background: #e3eef8 !important; }
.cm-tooltip-autocomplete { font-family: var(--mono) !important; font-size: 12.5px; border-radius: 8px !important; border: 1px solid var(--line) !important; box-shadow: 0 8px 28px rgba(0,0,0,.14) !important; }
.cm-tooltip-autocomplete ul li[aria-selected] { background: var(--accent) !important; color: var(--accent-ink) !important; }
.cm-completionDetail { color: var(--muted); font-style: normal; margin-left: 8px; }
.cm-completionIcon { opacity: .7; }

/* ---------- Preview ---------- */
.preview-body { position: relative; flex: 1; min-height: 0; background: #525659; }
.pdf { width: 100%; height: 100%; border: 0; background: #525659; }
.log {
  position: absolute; inset: 0; margin: 0; padding: 12px 14px; overflow: auto;
  background: #16202b; color: #d6e2ea; font-family: var(--mono);
  font-size: 12px; line-height: 1.5; white-space: pre-wrap;
}
.log .errline { color: #ff9b88; }
.preview-empty {
  position: absolute; inset: 0; display: grid; place-items: center;
  color: #cdd5da; font-size: 14px; background: #525659;
}
.hidden { display: none !important; }

/* ---------- Splitters ---------- */
.splitter { background: transparent; cursor: col-resize; position: relative; }
.splitter::after { content: ""; position: absolute; inset: 0 2px; background: var(--line); }
.splitter:hover::after { background: var(--accent); }

.muted { color: var(--muted); }
.small { font-size: 11px; }

/* ---------- Editor header additions ---------- */
.brand .backlink {
  color: #eef4f9; text-decoration: none; font-size: 18px; line-height: 1;
  opacity: .8; padding: 0 4px; border-radius: 6px;
}
.brand .backlink:hover { opacity: 1; background: rgba(255,255,255,.12); }
.brand .projname {
  font-size: 13px; color: #cddce8; margin-left: 8px; padding-left: 10px;
  border-left: 1px solid rgba(255,255,255,.18);
  max-width: 280px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

/* ---------- Archive (landing) page ---------- */
.archive-body { overflow: auto; background: var(--panel-2); }
.archive-body .topbar { position: sticky; top: 0; z-index: 5; }
.archive { max-width: 1040px; margin: 0 auto; padding: 28px 22px 64px; }
.archive-head h1 { margin: 6px 0 2px; font-size: 24px; color: var(--ink); }
.archive-head .sub { margin: 0 0 22px; color: var(--muted); font-size: 14px; }

.proj-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
.proj-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px; display: flex; flex-direction: column; gap: 8px;
  transition: box-shadow .15s, transform .1s, border-color .15s;
}
.proj-card:hover { box-shadow: 0 8px 24px rgba(16,48,73,.10); border-color: var(--accent); transform: translateY(-1px); }
.proj-icon {
  width: 40px; height: 40px; border-radius: 9px; display: grid; place-items: center;
  font-size: 20px; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--lilac));
}
.proj-name { font-weight: 600; font-size: 15px; color: var(--ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.proj-meta { font-size: 11.5px; color: var(--muted); flex: 1; }
.proj-actions { display: flex; gap: 8px; margin-top: 4px; }
.proj-actions .mini { padding: 5px 12px; font-size: 12px; }
.proj-actions .open { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.proj-actions .open:hover { background: #6aa6d0; }
.mini.danger { color: var(--coral); border-color: #f3cfc9; background: #fff; }
.mini.danger:hover { background: #fdeeeb; }

.proj-empty { text-align: center; color: var(--ink); padding: 64px 20px; }
.proj-empty p { margin: 6px 0; }
.proj-empty .muted { color: var(--muted); }

/* ====================================================================
   EDITOR COLOUR PALETTES  (switchable from the "Theme" dropdown)
   To add a palette:
     1) add a  body[data-editor-theme="<id>"]  block below with the same vars
     2) add  { id:"<id>", label:"<Name>" }  to PALETTES in public/app.js
   Only the editor surface + syntax tokens are themed; the app chrome is fixed.
   ==================================================================== */
:root{
  --ed-bg:#ffffff; --ed-fg:#243240;
  --ed-gutter-bg:#f7f9fc; --ed-gutter-fg:#aab6c2;
  --ed-active-line:#eef5fb; --ed-active-gutter:#e3eef8;
  --ed-selection:#cfe6f7; --ed-cursor:#5f9bc9;
  --ed-tok-command:#2f7d4f; --ed-tok-comment:#8a94a0; --ed-tok-string:#b9650f;
  --ed-tok-number:#7a3ea8; --ed-tok-math:#1f6feb; --ed-tok-bracket:#8a94a0; --ed-tok-meta:#6b7785;
}
body[data-editor-theme="light"]{
  --ed-bg:#ffffff; --ed-fg:#243240;
  --ed-gutter-bg:#f7f9fc; --ed-gutter-fg:#aab6c2;
  --ed-active-line:#eef5fb; --ed-active-gutter:#e3eef8;
  --ed-selection:#cfe6f7; --ed-cursor:#5f9bc9;
  --ed-tok-command:#2f7d4f; --ed-tok-comment:#8a94a0; --ed-tok-string:#b9650f;
  --ed-tok-number:#7a3ea8; --ed-tok-math:#1f6feb; --ed-tok-bracket:#8a94a0; --ed-tok-meta:#6b7785;
}
body[data-editor-theme="dark"]{
  --ed-bg:#0f1722; --ed-fg:#d7e0ea;
  --ed-gutter-bg:#0c131c; --ed-gutter-fg:#5a6b7d;
  --ed-active-line:#16202c; --ed-active-gutter:#1b2735;
  --ed-selection:#2c4a63; --ed-cursor:#7eb0d5;
  --ed-tok-command:#7ee0a8; --ed-tok-comment:#6a7889; --ed-tok-string:#f0a868;
  --ed-tok-number:#c79bf0; --ed-tok-math:#6fb3ff; --ed-tok-bracket:#8aa0b4; --ed-tok-meta:#8aa0b4;
}
body[data-editor-theme="solarized"]{
  --ed-bg:#fdf6e3; --ed-fg:#586e75;
  --ed-gutter-bg:#f2ead0; --ed-gutter-fg:#93a1a1;
  --ed-active-line:#f5edd6; --ed-active-gutter:#eee5c9;
  --ed-selection:#e3dcc0; --ed-cursor:#b58900;
  --ed-tok-command:#859900; --ed-tok-comment:#93a1a1; --ed-tok-string:#2aa198;
  --ed-tok-number:#d33682; --ed-tok-math:#268bd2; --ed-tok-bracket:#93a1a1; --ed-tok-meta:#657b83;
}
body[data-editor-theme="nord"]{
  --ed-bg:#2e3440; --ed-fg:#d8dee9;
  --ed-gutter-bg:#2b313c; --ed-gutter-fg:#4c566a;
  --ed-active-line:#353c4a; --ed-active-gutter:#3b4252;
  --ed-selection:#434c5e; --ed-cursor:#88c0d0;
  --ed-tok-command:#a3be8c; --ed-tok-comment:#616e88; --ed-tok-string:#ebcb8b;
  --ed-tok-number:#b48ead; --ed-tok-math:#81a1c1; --ed-tok-bracket:#7b8392; --ed-tok-meta:#8893a3;
}

/* editor surface driven by the variables above (two-class selectors so they win) */
.cm-editor{ background:var(--ed-bg); }
.cm-editor .cm-content{ color:var(--ed-fg); caret-color:var(--ed-cursor); }
.cm-editor .cm-cursor, .cm-editor .cm-dropCursor{ border-left-color:var(--ed-cursor) !important; }
.cm-editor .cm-gutters{ background:var(--ed-gutter-bg) !important; color:var(--ed-gutter-fg) !important; border-right:1px solid var(--line) !important; }
.cm-editor .cm-activeLine{ background:var(--ed-active-line) !important; }
.cm-editor .cm-activeLineGutter{ background:var(--ed-active-gutter) !important; color:var(--ed-gutter-fg) !important; }
.cm-editor .cm-selectionBackground,
.cm-editor.cm-focused .cm-selectionBackground,
.cm-editor ::selection{ background:var(--ed-selection) !important; }

/* ---------- Identity: sign-in overlay + user chip ---------- */
.auth-overlay {
  position: fixed; inset: 0; z-index: 50;
  display: grid; place-items: center; padding: 20px;
  background: rgba(20, 30, 41, .55); backdrop-filter: blur(3px);
}
.auth-card {
  position: relative;
  width: 100%; max-width: 380px; background: var(--panel);
  border: 1px solid var(--line); border-radius: 14px;
  padding: 26px 26px 24px; box-shadow: 0 24px 60px rgba(16, 48, 73, .28);
}
.auth-close {
  position: absolute; top: 12px; right: 12px;
  width: 30px; height: 30px; display: grid; place-items: center;
  border: 0; border-radius: 8px; background: transparent;
  color: var(--muted); font-size: 15px; line-height: 1; cursor: pointer;
}
.auth-close:hover { background: var(--accent-soft); color: var(--ink); }
.auth-brand { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 17px; color: var(--ink); }
.auth-brand .logo {
  width: 28px; height: 28px; border-radius: 7px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--lilac)); color: #fff; font-size: 18px;
}
.auth-brand .thin { font-weight: 300; opacity: .8; }
.auth-card h2 { margin: 16px 0 4px; font-size: 19px; color: var(--ink); }
.auth-sub { margin: 0 0 16px; font-size: 13px; line-height: 1.5; color: var(--muted); }
.auth-form { display: flex; flex-direction: column; gap: 12px; }
.auth-form label { display: flex; flex-direction: column; gap: 5px; font-size: 12px; font-weight: 600; color: var(--muted); }
.auth-form input {
  font-family: inherit; font-size: 14px; padding: 9px 11px; border-radius: 8px;
  border: 1px solid var(--line); background: #fff; color: var(--ink);
}
.auth-form input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.auth-err { color: var(--coral); font-size: 12.5px; font-weight: 600; }
.auth-submit { margin-top: 4px; padding: 10px; font-size: 14px; }
.auth-submit:disabled { opacity: .6; cursor: default; }

.user-chip { display: flex; align-items: center; gap: 8px; margin-right: 2px; }
.user-chip-name {
  font-size: 12.5px; color: #eef4f9; max-width: 200px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.user-chip-switch {
  font-size: 11px; padding: 3px 8px; border-radius: 6px;
  border: 1px solid rgba(255,255,255,.25); background: rgba(255,255,255,.08); color: #dfe9f1;
}
.user-chip-switch:hover { background: rgba(255,255,255,.16); }