:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --ink: #1c2430;
  --ink-soft: #5b6572;
  --line: #dfe3e8;
  --accent: #1f4e79;
  --accent-soft: #e8f0f8;
  --gold: #8a6d1f;
  --gold-soft: #faf3dd;
  --green: #1e6b3a;
  --green-soft: #e3f2e8;
  --red: #a12626;
  --red-soft: #fbe9e9;
  --radius: 10px;
  --sidebar-w: 218px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 14.5px;
  line-height: 1.5;
}
#app { height: 100vh; }

button {
  font: inherit; cursor: pointer; border: 1px solid var(--line);
  background: var(--panel); color: var(--ink); border-radius: 8px; padding: 7px 14px;
}
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover { background: #163a5b; }
button.small { padding: 3px 10px; font-size: 12.5px; }
button:disabled { opacity: .5; cursor: default; }
input, textarea, select {
  font: inherit; color: var(--ink); background: #fff;
  border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; width: 100%;
}
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
textarea { resize: vertical; min-height: 74px; }
label { display: block; font-size: 12.5px; font-weight: 600; color: var(--ink-soft); margin: 10px 0 4px; }
a { color: var(--accent); }

.loading-screen { display: flex; align-items: center; justify-content: center; height: 100vh; color: var(--ink-soft); }

/* ---------- auth screens ---------- */
.auth-wrap { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }
.auth-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  padding: 34px 38px; width: 430px; max-width: 100%;
  box-shadow: 0 10px 40px rgba(20, 40, 70, .08);
}
.auth-card h1 { margin: 0 0 4px; font-size: 22px; }
.auth-card .sub { color: var(--ink-soft); margin: 0 0 18px; font-size: 13.5px; }
.brand { font-weight: 700; letter-spacing: .3px; color: var(--accent); font-size: 13px; text-transform: uppercase; margin-bottom: 14px; }
.err { color: var(--red); background: var(--red-soft); border-radius: 8px; padding: 8px 12px; margin-top: 12px; font-size: 13px; }
.ok-note { color: var(--green); background: var(--green-soft); border-radius: 8px; padding: 8px 12px; margin-top: 12px; font-size: 13px; }
.auth-card button.primary { width: 100%; margin-top: 16px; padding: 10px; }
.code-input { letter-spacing: 8px; font-size: 22px; text-align: center; font-variant-numeric: tabular-nums; }

/* ---------- shell ---------- */
.shell { display: flex; height: 100vh; }
.sidebar {
  width: var(--sidebar-w); flex: none; background: #20344b; color: #cfd9e4;
  display: flex; flex-direction: column; padding: 14px 0;
}
.sidebar .brand-side { color: #fff; font-weight: 700; padding: 4px 18px 14px; font-size: 16px; border-bottom: 1px solid rgba(255,255,255,.12); }
.sidebar .brand-side small { display: block; font-weight: 400; color: #8fa3b8; font-size: 11px; margin-top: 2px; }
.nav { flex: 1; overflow-y: auto; padding-top: 8px; }
.nav-item {
  display: flex; align-items: center; gap: 10px; padding: 8px 18px; cursor: pointer;
  color: #cfd9e4; font-size: 14px; border-left: 3px solid transparent;
}
.nav-item:hover { background: rgba(255,255,255,.06); }
.nav-item.active { background: rgba(255,255,255,.1); color: #fff; border-left-color: #7fb2e5; }
.nav-item .badge { margin-left: auto; background: var(--red); color: #fff; font-size: 11px; border-radius: 10px; padding: 0 7px; }
.side-foot { padding: 10px 18px; border-top: 1px solid rgba(255,255,255,.12); font-size: 12.5px; }
.side-foot .who { color: #fff; font-weight: 600; }
.side-foot .role { color: #8fa3b8; }
.side-foot button { margin-top: 8px; width: 100%; background: transparent; color: #cfd9e4; border-color: rgba(255,255,255,.25); }

.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
  display: flex; align-items: center; gap: 14px; padding: 12px 22px;
  background: var(--panel); border-bottom: 1px solid var(--line);
}
.topbar h2 { margin: 0; font-size: 17px; flex: none; }
.searchbox { flex: 1; max-width: 480px; margin-left: auto; }
.content { flex: 1; overflow-y: auto; padding: 22px; }

.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; margin-bottom: 16px; }
.card h3 { margin: 0 0 10px; font-size: 15.5px; }
.muted { color: var(--ink-soft); font-size: 12.5px; }
.pill { display: inline-block; font-size: 11.5px; font-weight: 600; border-radius: 20px; padding: 1px 10px; vertical-align: 1px; }
.pill.open { background: var(--gold-soft); color: var(--gold); }
.pill.answered { background: var(--green-soft); color: var(--green); }
.pill.owner { background: var(--accent-soft); color: var(--accent); }
.pill.guest { background: #efe7f6; color: #5b3a80; }
.pill.superseded { background: #eee; color: #777; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.spread { justify-content: space-between; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 900px) { .grid2 { grid-template-columns: 1fr; } }

.doc-chip {
  display: inline-flex; align-items: center; gap: 6px; background: var(--accent-soft);
  color: var(--accent); border-radius: 8px; padding: 2px 10px; font-size: 12.5px;
  cursor: pointer; margin: 3px 6px 0 0; border: 1px solid #cfe0ef;
}
.doc-chip:hover { background: #d9e8f6; }

/* ---------- documents ---------- */
.cat-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.cat-tab { border: 1px solid var(--line); border-radius: 20px; padding: 4px 14px; cursor: pointer; background: var(--panel); font-size: 13px; }
.cat-tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.doc-table { width: 100%; border-collapse: collapse; }
.doc-table th { text-align: left; font-size: 12px; text-transform: uppercase; letter-spacing: .4px; color: var(--ink-soft); padding: 6px 10px; border-bottom: 2px solid var(--line); }
.doc-table td { padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.doc-table tr:hover td { background: #f8fafc; }
.doc-title { font-weight: 600; color: var(--accent); cursor: pointer; }
.doc-title:hover { text-decoration: underline; }

/* ---------- viewer overlay ---------- */
#viewer-overlay {
  position: fixed; inset: 0; background: rgba(15, 25, 40, .78); z-index: 50;
  display: flex; align-items: center; justify-content: center; padding: 24px;
}
#viewer-overlay.hidden { display: none; }
.viewer-box {
  background: var(--panel); border-radius: 12px; width: min(1060px, 100%); height: 100%;
  display: flex; flex-direction: column; overflow: hidden;
}
.viewer-head { display: flex; align-items: center; gap: 12px; padding: 10px 16px; border-bottom: 1px solid var(--line); }
.viewer-head h3 { margin: 0; font-size: 15px; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.viewer-body { flex: 1; overflow: auto; background: #525659; }
.viewer-body iframe { width: 100%; height: 100%; border: 0; display: block; }
.viewer-body img { display: block; max-width: 100%; margin: 20px auto; background: #fff; }
.viewer-body .doc-html { background: #fff; max-width: 820px; margin: 20px auto; padding: 40px 50px; min-height: 90%; }
.viewer-body .doc-html table { border-collapse: collapse; }
.viewer-body .doc-html td, .viewer-body .doc-html th { border: 1px solid #ccc; padding: 3px 8px; font-size: 13px; }

/* ---------- discussion ---------- */
.disc-layout { display: flex; gap: 18px; height: 100%; }
.channel-list { width: 210px; flex: none; }
.channel-item { padding: 7px 12px; border-radius: 8px; cursor: pointer; font-size: 14px; display: flex; justify-content: space-between; gap: 6px; }
.channel-item:hover { background: #eceff3; }
.channel-item.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.channel-item .cnt { color: var(--ink-soft); font-size: 12px; }
.disc-main { flex: 1; min-width: 0; }
.thread-card { cursor: pointer; }
.thread-card:hover { border-color: var(--accent); }
.post { padding: 10px 0; border-top: 1px solid var(--line); }
.post:first-child { border-top: 0; }
.post .phead { font-size: 12.5px; color: var(--ink-soft); margin-bottom: 2px; }
.post .phead b { color: var(--ink); font-size: 13.5px; }
.post .pbody { white-space: pre-wrap; word-wrap: break-word; }
.reply-indent { margin-left: 26px; border-left: 2px solid var(--line); padding-left: 14px; }
.compose { margin-top: 14px; }
.compose .row { margin-top: 8px; }

/* ---------- search results ---------- */
.snippet mark, .snippet b { background: #ffe9a8; font-weight: 600; padding: 0 1px; }
.result-item { padding: 10px 0; border-bottom: 1px solid var(--line); cursor: pointer; }
.result-item:hover { background: #f8fafc; }

/* ---------- AI ---------- */
.ai-banner {
  background: var(--gold-soft); border: 1px solid #e5d9a8; color: var(--gold);
  border-radius: var(--radius); padding: 10px 14px; font-size: 13px; margin-bottom: 16px;
}
.ai-answer { white-space: pre-wrap; }
.ai-q { font-weight: 600; margin-bottom: 6px; }

/* ---------- admin ---------- */
.code-display { font-size: 26px; letter-spacing: 6px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--accent); }
.audit-row { font-size: 12.5px; padding: 5px 0; border-bottom: 1px solid var(--line); display: flex; gap: 10px; }
.audit-row .t { color: var(--ink-soft); flex: none; width: 150px; }

#toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: #fff; border-radius: 10px; padding: 10px 20px;
  font-size: 13.5px; opacity: 0; pointer-events: none; transition: opacity .25s; z-index: 100;
}
#toast.show { opacity: 1; }
.hidden { display: none !important; }