:root{
  --bg:#f4f6fb; --panel:#fff; --ink:#1c2430; --muted:#6b7686; --line:#e3e8f0;
  --accent:#3b5bdb; --accent2:#edf0fb; --ok:#2f9e44; --warn:#e8590c; --err:#e03131;
  --chip:#eef1f8;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--ink);font-size:14px}
#app{display:flex;min-height:100vh}
#sidebar{width:220px;background:#0f1b3d;color:#cfd8f0;display:flex;flex-direction:column;position:fixed;height:100vh}
.brand{padding:18px 18px 10px;font-weight:700;font-size:18px;line-height:1.15}
.brand span{font-weight:400;font-size:12px;color:#8fa1d6}
#nav{display:flex;flex-direction:column;margin-top:10px;flex:1}
#nav a{color:#cdd6ef;text-decoration:none;padding:10px 18px;font-size:14px;border-left:3px solid transparent}
#nav a:hover{background:#16265a}
#nav a.active{background:#1b2e6b;border-left-color:#6f8bff;color:#fff;font-weight:600}
/* The "Browse all pages" link leaves the SPA for the plain, crawlable/printable
   pages — set apart with a divider + muted styling so it reads as a different
   kind of destination than the in-app hash routes above it. */
#nav a.nav-ext{margin-top:8px;padding-top:14px;border-top:1px solid #1b2e6b;color:#8ea2d6;font-size:13px}
#nav a.nav-ext:hover{background:#16265a;color:#cdd6ef}
#main{margin-left:220px;flex:1;padding:24px 30px;max-width:1180px}
h1{font-size:22px;margin:0 0 4px}
h2{font-size:16px;margin:22px 0 8px}
.sub{color:var(--muted);margin:0 0 18px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px 18px;margin-bottom:16px}
.banner{border-radius:8px;padding:9px 12px;font-size:.9rem}.banner.warn{background:#fdf0e6;color:#9a4a08;border:1px solid #f0c89e}
.banner.info{background:#eaf2fd;color:#1c4e8a;border:1px solid #b9d3f2}
.row{display:flex;gap:14px;flex-wrap:wrap}
.row>*{flex:1;min-width:0}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px}
.card .big{font-size:24px;font-weight:700}
.card .lbl{color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.04em}
label{display:block;font-size:12px;color:var(--muted);margin:8px 0 3px;font-weight:600}
input,select,textarea,button{font:inherit}
input[type=text],input[type=number],select,textarea{width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:7px;background:#fff}
textarea{min-height:90px;font-family:ui-monospace,Menlo,monospace;font-size:12px}
button{background:var(--accent);color:#fff;border:0;border-radius:7px;padding:8px 14px;cursor:pointer;font-weight:600}
button:hover{filter:brightness(1.06)} button:disabled{opacity:.5;cursor:not-allowed}
button.ghost{background:#fff;color:var(--accent);border:1px solid var(--accent)}
button.sm{padding:4px 9px;font-size:12px;font-weight:600}
button.danger{background:var(--err)}
button.muted{background:#eef1f8;color:#33415c}
table{width:100%;border-collapse:collapse}
th,td{text-align:left;padding:8px 8px;border-bottom:1px solid var(--line);vertical-align:top;font-size:13px}
th{color:var(--muted);font-weight:600;font-size:11px;text-transform:uppercase;letter-spacing:.03em}
.chip{display:inline-block;background:var(--chip);border-radius:5px;padding:1px 7px;font-size:11px;margin:1px 2px;color:#3a4660}
.chip.ok{background:#e6f4ea;color:#216e33}.chip.err{background:#fdeaea;color:#b42318}
.chip.warn{background:#fdf0e6;color:#9a4a08}.chip.acc{background:var(--accent2);color:#2b3f9e}
.chip.disc{background:#f3e8fd;color:#7a3ec0}
.masthead{text-align:center;margin:0 0 4px}
.masthead .board{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.masthead .subject{font-size:24px;font-weight:700;letter-spacing:.02em;margin:1px 0}
.masthead .kind{font-size:14px;color:var(--ink,#1a2433);text-transform:uppercase;letter-spacing:.06em}
.masthead .srctag{font-size:12px;font-style:italic;color:var(--muted);margin-top:2px}
.exambar{display:flex;justify-content:space-between;font-size:12.5px;font-weight:600;
  border-top:1.5px solid var(--ink,#33414f);border-bottom:1.5px solid var(--ink,#33414f);
  padding:6px 2px;margin:10px 0 16px}
.filters-panel{background:#fafbff}
.filters-panel .frow{display:flex;gap:10px;margin:3px 0;font-size:13px}
.filters-panel .fk{color:var(--muted);flex:0 0 170px;min-width:170px}
.filters-panel .fv{color:var(--ink,#111)}
.badge-dot{display:inline-block;width:9px;height:9px;border-radius:50%;margin-right:5px}
.dot-ok{background:var(--ok)}.dot-err{background:var(--err)}.dot-warn{background:var(--warn)}.dot-none{background:#c4ccda}
/* pending: queued, not yet started — neutral slate-blue, clearly "waiting" not "error" */
.dot-pending{background:#8a96ad}
/* processing: spinning ring so it reads as live, in-progress work */
.dot-processing{background:none;border:2px solid var(--accent2);border-top-color:var(--accent);
  border-radius:50%;animation:dot-spin .7s linear infinite}
@keyframes dot-spin{to{transform:rotate(360deg)}}
.muted{color:var(--muted)} .small{font-size:12px} .mono{font-family:ui-monospace,Menlo,monospace}
.source-note p{font-size:15px;color:var(--ink);margin:0;line-height:1.45}
.source-note p b{font-size:16px}
.right{text-align:right}
.tree-row{display:flex;align-items:center;gap:8px;padding:7px 4px;border-bottom:1px solid var(--line)}
.tree-row .title{flex:1}
/* Search topic filter: collapsible multi-select tree in a popover */
.msel{position:relative}
.msel-btn{width:100%;text-align:left;padding:8px 10px;border:1px solid var(--line);border-radius:7px;
  background:#fff;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:8px;color:var(--muted)}
.msel-btn.has-sel{color:var(--ink);font-weight:600;border-color:var(--accent)}
.msel-btn::after{content:'▾';color:var(--muted);font-size:11px;flex:none}
.msel-panel{position:absolute;z-index:45;top:calc(100% + 4px);left:0;right:0;min-width:280px;max-height:340px;
  overflow:auto;background:#fff;border:1px solid var(--line);border-radius:8px;
  box-shadow:0 10px 28px rgba(15,20,35,.16);padding:6px}
.msel-panel.hidden{display:none}
.msel-tools{display:flex;justify-content:space-between;gap:12px;padding:2px 6px 6px;
  border-bottom:1px solid var(--line);margin-bottom:4px}
.msel-tools a{cursor:pointer;color:var(--accent);font-size:12px}
.msel-tools a:hover{text-decoration:underline}
.msel-row{display:flex;align-items:flex-start;gap:4px;border-radius:5px}
.msel-row:hover{background:#f4f6fb}
.msel-row label{flex:1;margin:0;display:flex;align-items:flex-start;gap:8px;cursor:pointer;
  font-weight:400;font-size:15px;padding:6px 6px 6px 0;line-height:1.4}
.msel-row input[type=checkbox]{width:auto;margin:3px 0 0}
.msel-caret{width:18px;flex:none;cursor:pointer;color:var(--muted);text-align:center;
  user-select:none;font-size:12px;padding-top:8px}
.msel-caret.leaf{cursor:default;color:#cbd2e0}
.msel-children{margin-left:20px}
.msel-children.collapsed{display:none}
.msel-grouplabel{padding:7px 6px 3px;font-weight:600;border-top:1px solid var(--line);margin-top:4px}
.pill{font-size:11px;background:#eef1f8;border-radius:10px;padding:1px 8px;color:#3a4660}
a.link{color:var(--accent);cursor:pointer;text-decoration:none}a.link:hover{text-decoration:underline}
/* stacked action links in a table cell (Library → Papers) */
.cell-actions{display:flex;flex-direction:column;align-items:flex-start;gap:4px;white-space:nowrap}
.qcard{border:1px solid var(--line);border-radius:9px;padding:12px 14px;margin-bottom:10px;background:#fff}
.qcard .qmeta{display:flex;gap:6px;flex-wrap:wrap;align-items:center;margin-bottom:5px}
.qcard .flex label{display:inline-flex;align-items:center;gap:5px;margin:0;white-space:nowrap}
.qcard .flex select.qa-model{width:auto;max-width:200px;padding:4px 8px;font-size:12px}
/* inline model/option pickers sitting next to buttons in flex/qmeta toolbars
   (paper-view answer-key row, per-question row, search screen) — keep them
   vertically centered with the buttons and size selects to content */
.flex>label.small,.qcard .qmeta>label.small{display:inline-flex;align-items:center;gap:5px;margin:0;white-space:nowrap;font-weight:600}
.flex>label.small select,.qcard .qmeta>label.small select{width:auto;max-width:220px;padding:4px 8px;font-size:12px}
.flex>label.small input[type=checkbox]{width:auto;margin:0}
.qtext{white-space:pre-wrap}
.stimulus{background:#f7f8fb;border-left:3px solid #c7cede;padding:7px 10px;margin:6px 0;white-space:pre-wrap;font-size:13px}
.stimulus-preview{background:#f7f8fb;border-left:3px solid #c7cede;padding:6px 9px;margin:5px 0;font-size:12.5px;color:#444}
/* "Previously asked in" — a prominent box in the View-question modal/SEO page, and
   a noticeable (but unboxed) grey line under each question on the paper view. */
.occ-box{border:1.5px solid #c9a96a;background:#fdf8ee;border-radius:8px;padding:9px 13px;margin:10px 0}
.occ-box .occ-label{font-weight:700;color:#8a5a12;font-size:12px;text-transform:uppercase;letter-spacing:.05em}
.occ-box .occ-list{font-size:14px;color:#222;font-weight:600;margin-top:2px}
.occ-line{font-size:12.5px;color:#555;margin-top:5px}
/* The "find the original CBSE paper" note — shown once, a bit larger so it's read. */
.cbse-note{font-size:13px;color:#444;line-height:1.5;border:1px solid var(--line);background:#fafbff;border-radius:8px;padding:11px 14px;margin:14px 0}
.cbse-note a{color:#8a5a12;font-weight:700}
ol.subq{margin:8px 0 4px;padding-left:22px}
ol.subq>li{margin:5px 0}
ol.opts{margin:3px 0;padding-left:20px;list-style:none}
.answer{background:#f2faf3;border-left:3px solid #93c79a;padding:8px 10px;margin-top:8px;white-space:pre-wrap}
.answer .ans-by{white-space:normal;font-size:12px;font-weight:600;color:#176;background:#e2f3e4;margin:-8px -10px 8px;padding:4px 10px;border-bottom:1px solid #cce8cf}
.flex{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.spacer{flex:1}
/* download buttons row under the paper actions */
.export-row{display:flex;gap:10px;align-items:center;flex-wrap:wrap;
  margin-top:12px;padding-top:12px;border-top:1px solid var(--line)}
a.btn-link{display:inline-flex;align-items:center;background:#fff;color:var(--accent);
  border:1px solid var(--accent);border-radius:7px;padding:7px 13px;font-size:13px;
  font-weight:600;text-decoration:none;white-space:nowrap}
a.btn-link:hover{background:var(--accent);color:#fff}
.bulkbar{margin-top:10px;display:flex;flex-wrap:wrap;gap:14px;align-items:center;border-top:1px solid var(--line);padding-top:10px}
.bulk-action{display:inline-flex;align-items:center;gap:7px}
.bulk-action label{display:inline-flex;align-items:center;gap:5px;margin:0;font-weight:600}
.bulk-action label input{width:auto;margin:0}
.loading{color:var(--muted);padding:30px}
.hidden{display:none}
#toast{position:fixed;right:18px;bottom:18px;display:flex;flex-direction:column;gap:8px;z-index:50}
.toast{background:#1c2430;color:#fff;padding:11px 14px;border-radius:8px;max-width:380px;box-shadow:0 6px 22px rgba(0,0,0,.2);font-size:13px}
.toast.err{background:#b42318}.toast.ok{background:#216e33}
#modal:not(.hidden){position:fixed;inset:0;background:rgba(15,20,35,.45);display:flex;align-items:center;justify-content:center;z-index:60}
.modal-card{background:#fff;border-radius:12px;padding:20px 22px;max-width:680px;width:90%;max-height:84vh;overflow:auto}
.confirm-body{font-size:14px;line-height:1.5}
.confirm-body ul{margin:6px 0 12px;padding-left:20px} .confirm-body li{margin:3px 0}
.confirm-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:16px}
.tabs{display:flex;gap:6px;margin-bottom:12px;border-bottom:1px solid var(--line)}
.tabs a{padding:8px 12px;cursor:pointer;color:var(--muted);border-bottom:2px solid transparent;font-weight:600}
.tabs a.active{color:var(--accent);border-bottom-color:var(--accent)}
.checkitem{display:flex;gap:8px;align-items:flex-start;padding:8px;border-bottom:1px solid var(--line)}
.checkitem input{margin-top:3px;flex:none;width:auto}
/* Upload scan preview rows — readable, card-style */
.scanitem{display:flex;gap:12px;align-items:flex-start;padding:14px 16px;background:#fafbff;
  border:1px solid var(--line);border-radius:10px;margin-bottom:10px;transition:border-color .15s,box-shadow .15s}
.scanitem:hover{border-color:#c4cee8;box-shadow:0 1px 4px rgba(20,40,90,.06)}
/* Ignored (unchecked) files read dimmer than the ones that will be processed; checking one
   restores the full-strength look. Driven live by the checkbox via the .dimmed toggle in app.js. */
.scanitem.dimmed{background:#f4f5f7;border-style:dashed;opacity:.6}
.scanitem.dimmed:hover{opacity:.8}
.scanitem input{margin-top:5px;flex:none;width:auto;transform:scale(1.25)}
.scanitem-body{flex:1;min-width:0}
.scanitem-name{font-size:15px;font-weight:600;color:var(--ink);word-break:break-word}
.scanitem-desc{margin-top:6px;font-size:13.5px;line-height:1.5;color:#3a4660}
/* Prominent textbook-vs-paper type tag in the scan preview, so the user can see at a
   glance which pipeline each file will go to (a wrong type = wrong pipeline). */
.typetag{display:inline-flex;align-items:center;gap:5px;font-size:12.5px;font-weight:700;
  border-radius:6px;padding:3px 9px;letter-spacing:.01em;white-space:nowrap}
.typetag.tt-textbook{background:var(--accent2);color:#2b3f9e;border:1px solid #b9c6f5}
.typetag.tt-paper{background:#eef1f6;color:#3a4660;border:1px solid #d3d9e6}
.kv{display:grid;grid-template-columns:160px 1fr;gap:4px 12px;font-size:13px}
.kv div:nth-child(odd){color:var(--muted)}