:root {
  --bg: #0b0e14;
  --bg2: #10141d;
  --card: #151a26;
  --card2: #1a2130;
  --border: #232c3f;
  --fg: #e8ecf4;
  --muted: #8b96ab;
  --accent: #5b8cff;
  --accent2: #7c5bff;
  --ok: #3ecf8e;
  --warn: #f5b83d;
  --err: #ff6b6b;
  --mono: "JetBrains Mono", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  font-family: "Inter", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ---------- top bar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  flex: 0 0 auto;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  font-size: 26px; color: var(--accent);
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.brand h1 { font-size: 17px; font-weight: 800; letter-spacing: .3px; }
.brand p { font-size: 11px; color: var(--muted); }
.topbar-right { display: flex; align-items: center; gap: 10px; }
.gh-link { font-size: 12px; color: var(--muted); text-decoration: none; }
.gh-link:hover { color: var(--fg); }

.pill {
  font-size: 11px; padding: 3px 10px; border-radius: 999px;
  border: 1px solid var(--border); font-family: var(--mono);
}
.pill-ok { color: var(--ok); border-color: rgba(62,207,142,.4); }
.pill-err { color: var(--err); border-color: rgba(255,107,107,.4); }
.pill-muted { color: var(--muted); }

/* ---------- layout ---------- */
.layout {
  flex: 1 1 auto; display: grid;
  grid-template-columns: minmax(420px, 1.15fr) minmax(380px, 1fr);
  gap: 0; min-height: 0;
}
.pane { display: flex; flex-direction: column; min-height: 0; }
.pane-doc { border-right: 1px solid var(--border); }
.pane-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; border-bottom: 1px solid var(--border);
  flex: 0 0 auto; background: var(--bg2);
}
.pane-head h2 { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); }
.doc-actions { display: flex; gap: 8px; align-items: center; }

/* ---------- buttons ---------- */
.btn {
  font-family: inherit; font-size: 12.5px; font-weight: 600;
  padding: 7px 14px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--card); color: var(--fg); cursor: pointer;
  transition: all .15s;
  display: inline-flex; align-items: center; gap: 6px;
}
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent2)); border: none; color: #fff; }
.btn-primary:hover { filter: brightness(1.12); }
.btn-ghost { background: transparent; }
.btn-sm { padding: 3px 9px; font-size: 12px; }

/* ---------- dropdown ---------- */
.dropdown { position: relative; }
.dropdown-menu {
  display: none; position: absolute; right: 0; top: calc(100% + 6px);
  background: var(--card2); border: 1px solid var(--border); border-radius: 10px;
  min-width: 230px; z-index: 50; overflow: hidden;
  box-shadow: 0 12px 32px rgba(0,0,0,.5);
}
.dropdown-menu.open { display: block; }
.dropdown-menu button {
  display: block; width: 100%; text-align: left; padding: 10px 14px;
  background: none; border: none; color: var(--fg); font-family: inherit;
  font-size: 13px; cursor: pointer;
}
.dropdown-menu button:hover { background: var(--card); }
.dropdown-menu button small { display: block; color: var(--muted); font-size: 11px; margin-top: 2px; }

/* ---------- dropzone ---------- */
.dropzone {
  margin: 14px 16px; border: 1.5px dashed var(--border); border-radius: 14px;
  padding: 26px; text-align: center; color: var(--muted);
  transition: all .2s; flex: 0 0 auto;
}
.dropzone.drag { border-color: var(--accent); background: rgba(91,140,255,.06); }
.dz-icon { font-size: 34px; margin-bottom: 8px; }
.dropzone p { font-size: 13.5px; }
.dz-sub { font-size: 11.5px !important; margin-top: 5px; }

/* ---------- pipeline ---------- */
.pipeline {
  display: flex; gap: 6px; padding: 0 16px 10px; flex: 0 0 auto;
}
.stage {
  flex: 1; display: flex; align-items: center; gap: 7px;
  font-size: 11px; font-family: var(--mono); color: var(--muted);
  padding: 6px 10px; border-radius: 8px; background: var(--card);
  border: 1px solid var(--border);
}
.stage .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--border); flex: 0 0 auto; }
.stage.active { color: var(--fg); border-color: var(--accent); }
.stage.active .dot { background: var(--accent); animation: pulse 1s infinite; }
.stage.done { color: var(--ok); }
.stage.done .dot { background: var(--ok); }
.stage.err .dot { background: var(--err); }
@keyframes pulse { 50% { opacity: .35; } }

/* ---------- doc meta ---------- */
.doc-meta {
  padding: 8px 16px; font-size: 11.5px; font-family: var(--mono);
  color: var(--muted); border-bottom: 1px solid var(--border); flex: 0 0 auto;
  display: flex; gap: 14px; flex-wrap: wrap;
}
.doc-meta b { color: var(--fg); font-weight: 600; }

/* ---------- viewer ---------- */
.viewer-wrap { flex: 1 1 auto; min-height: 0; position: relative; }
.viewer { position: absolute; inset: 0; display: flex; flex-direction: column; }
.pages {
  flex: 1; overflow: auto; padding: 16px;
  display: flex; flex-direction: column; align-items: center; gap: 16px;
  background:
    radial-gradient(1200px 500px at 50% -100px, rgba(91,140,255,.05), transparent),
    var(--bg);
}
.page-holder { position: relative; box-shadow: 0 8px 30px rgba(0,0,0,.45); border-radius: 4px; }
.page-holder canvas { display: block; border-radius: 4px; }
.block-layer { position: absolute; inset: 0; pointer-events: none; }
.block-layer .blk {
  position: absolute; border: 1.5px solid transparent; border-radius: 3px;
  transition: all .15s; pointer-events: auto; cursor: pointer;
}
.block-layer .blk:hover { border-color: var(--accent); }
.block-layer .blk .blk-tag {
  display: none; position: absolute; top: -18px; left: -1.5px;
  font-size: 9.5px; font-family: var(--mono); padding: 1px 6px;
  background: var(--accent); color: #fff; border-radius: 3px 3px 3px 0;
  white-space: nowrap; z-index: 5;
}
.block-layer .blk:hover .blk-tag { display: block; }
.blk.kind-heading { border-color: rgba(245,184,61,.55); }
.blk.kind-table { border-color: rgba(62,207,142,.55); }
.blk.kind-kv { border-color: rgba(124,91,255,.55); }
.blk.kind-list { border-color: rgba(91,140,255,.4); }
.blk.kind-figure { border-color: rgba(255,107,107,.4); }
.blk.cited { border-color: var(--warn); background: rgba(245,184,61,.12); animation: citeflash 1.2s ease; }
@keyframes citeflash { 0% { background: rgba(245,184,61,.45); } }

.page-nav {
  flex: 0 0 auto; display: flex; align-items: center; gap: 10px;
  padding: 8px 16px; border-top: 1px solid var(--border); background: var(--bg2);
  font-size: 12px; font-family: var(--mono); color: var(--muted);
}
.chk { display: flex; align-items: center; gap: 5px; margin-left: auto; cursor: pointer; font-family: inherit; }

/* ---------- mode switch ---------- */
.mode-switch { display: flex; background: var(--card); border-radius: 8px; padding: 3px; border: 1px solid var(--border); }
.mode-btn {
  border: none; background: none; color: var(--muted); font-family: inherit;
  font-size: 11.5px; font-weight: 600; padding: 5px 11px; border-radius: 6px; cursor: pointer;
}
.mode-btn.active { background: var(--accent); color: #fff; }

/* ---------- chat ---------- */
.chat { flex: 1 1 auto; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.msg { display: flex; }
.msg-user { justify-content: flex-end; }
.bubble {
  max-width: 92%; padding: 10px 14px; border-radius: 12px;
  font-size: 13.5px; line-height: 1.55;
}
.msg-user .bubble { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #fff; border-bottom-right-radius: 4px; }
.msg-bot .bubble { background: var(--card); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.msg-sys .bubble { background: transparent; border: 1px dashed var(--border); color: var(--muted); font-size: 12.5px; }
.msg-err .bubble { background: rgba(255,107,107,.08); border: 1px solid rgba(255,107,107,.35); color: var(--err); font-size: 12.5px; }

.bubble .meta {
  display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px;
  font-size: 10.5px; font-family: var(--mono); color: var(--muted);
}
.bubble .meta .tag { border: 1px solid var(--border); padding: 1px 7px; border-radius: 999px; }

.cite {
  display: inline-block; font-family: var(--mono); font-size: 10.5px;
  background: rgba(245,184,61,.15); color: var(--warn);
  border: 1px solid rgba(245,184,61,.4); border-radius: 4px;
  padding: 0 5px; margin: 0 2px; cursor: pointer; vertical-align: 1px;
}
.cite:hover { background: rgba(245,184,61,.3); }

.citations { margin-top: 10px; display: flex; flex-direction: column; gap: 6px; }
.cit-card {
  border: 1px solid var(--border); border-radius: 8px; padding: 7px 10px;
  font-size: 11.5px; cursor: pointer; background: var(--bg2);
}
.cit-card:hover { border-color: var(--warn); }
.cit-card .cit-head { font-family: var(--mono); font-size: 10px; color: var(--warn); margin-bottom: 3px; }
.cit-card .cit-text { color: var(--muted); max-height: 54px; overflow: hidden; line-height: 1.45; }

.bubble table { border-collapse: collapse; margin: 6px 0; font-size: 12px; }
.bubble th, .bubble td { border: 1px solid var(--border); padding: 3px 8px; text-align: left; }
.bubble code { font-family: var(--mono); font-size: 12px; background: var(--bg2); padding: 1px 5px; border-radius: 4px; }
.bubble strong { color: #fff; }

.typing { display: inline-flex; gap: 4px; padding: 4px 0; }
.typing i { width: 6px; height: 6px; border-radius: 50%; background: var(--muted); animation: blink 1.2s infinite; }
.typing i:nth-child(2) { animation-delay: .2s; }
.typing i:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 30% { opacity: .2; } }

/* ---------- suggestions ---------- */
.suggestions {
  flex: 0 0 auto; display: flex; gap: 7px; flex-wrap: wrap;
  padding: 0 16px 10px;
}
.suggestions button {
  font-family: inherit; font-size: 11.5px; color: var(--muted);
  background: var(--card); border: 1px solid var(--border);
  padding: 5px 11px; border-radius: 999px; cursor: pointer;
}
.suggestions button:hover { color: var(--fg); border-color: var(--accent); }

/* ---------- ask bar ---------- */
.ask-bar {
  flex: 0 0 auto; display: flex; gap: 8px; padding: 12px 16px;
  border-top: 1px solid var(--border); background: var(--bg2);
}
.ask-bar input {
  flex: 1; font-family: inherit; font-size: 13.5px;
  background: var(--card); color: var(--fg);
  border: 1px solid var(--border); border-radius: 9px; padding: 10px 14px;
  outline: none;
}
.ask-bar input:focus { border-color: var(--accent); }

/* ---------- footer ---------- */
.foot {
  flex: 0 0 auto; display: flex; justify-content: space-between; gap: 12px;
  padding: 7px 18px; border-top: 1px solid var(--border);
  font-size: 10.5px; color: var(--muted); font-family: var(--mono);
  background: var(--bg2);
}

.hidden { display: none !important; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  body { overflow: auto; }
  .layout { grid-template-columns: 1fr; }
  .pane-doc { border-right: none; border-bottom: 1px solid var(--border); min-height: 70vh; }
  .pane-chat { min-height: 80vh; }
}