/* UMVA web platform styles.
 *
 * Design system from DESIGN.md: paper #F7F5EF, ink #102033, Umva Blue #4B8FE8,
 * muted #5C6B7A. Fraunces for display, Instrument Sans for body, IBM Plex Mono
 * for evidence and timestamps. 8px spacing, minimal motion, no dark mode, no
 * CSS framework, no gradients except the three documented hairline placements.
 */

:root {
  --paper: #F7F5EF;
  --ink: #102033;
  --blue: #4B8FE8;
  --muted: #5C6B7A;
  --line: #E4E0D6;
  --card: #FFFFFF;
  --space: 8px;
  --radius: 10px;
  --sidebar-w: 264px;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Instrument Sans", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* The one hairline gradient placement allowed: the top rule of the app frame. */
.hairline {
  height: 2px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, #4B8FE8, #7C5CE8, #E8A24B);
  opacity: 0.9;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

button {
  font-family: var(--font-body);
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  border-radius: var(--radius);
  padding: 8px 14px;
  font-size: 15px;
}
button:hover { border-color: var(--blue); }
button.primary { background: var(--blue); color: #fff; border-color: var(--blue); }
button.primary:hover { filter: brightness(0.96); }
button.quiet { border-color: transparent; background: transparent; color: var(--muted); padding: 4px 6px; font-size: 13px; }
button.quiet:hover { color: var(--ink); text-decoration: underline; border-color: transparent; }
button:disabled { opacity: 0.5; cursor: default; }

input, textarea, select {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
  width: 100%;
}
textarea { resize: vertical; min-height: 120px; }
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--blue); }
label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 4px; }

/* ---- app frame ---- */
.app { display: flex; height: 100vh; overflow: hidden; }

.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  background: #FBFAF6;
}
.brand { display: flex; align-items: center; gap: 8px; padding: 16px; }
.brand .mark { width: 28px; height: 28px; }
.brand .name { font-family: var(--font-display); font-size: 20px; font-weight: 600; }
.brand .desc { font-size: 12px; color: var(--muted); }

.nav { padding: 8px; display: flex; flex-direction: column; gap: 2px; }
.nav a {
  display: block; padding: 8px 12px; border-radius: var(--radius);
  color: var(--ink); font-size: 14px;
}
.nav a:hover { background: #F0EEE6; text-decoration: none; }
.nav a.active { background: #EAF1FC; color: var(--blue); }
.nav .section-label { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; padding: 12px 12px 4px; }

.newchat { margin: 8px; }
.convlist { flex: 1; overflow-y: auto; padding: 4px 8px; }
.convlist .conv { padding: 8px 12px; border-radius: var(--radius); font-size: 14px; color: var(--muted); cursor: pointer; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.convlist .conv:hover { background: #F0EEE6; color: var(--ink); }
.convlist .conv.active { background: #EAF1FC; color: var(--ink); }

.sidebar-foot { padding: 12px 16px; border-top: 1px solid var(--line); font-size: 12px; color: var(--muted); }

/* ---- main column ---- */
.main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.topbar { display: flex; align-items: center; gap: 10px; padding: 12px 20px; border-bottom: 1px solid var(--line); }
.topbar .mark { width: 24px; height: 24px; }
.topbar .title { font-family: var(--font-display); font-size: 17px; }
.topbar .spacer { flex: 1; }

.view { flex: 1; overflow-y: auto; }
.column { max-width: 760px; margin: 0 auto; padding: 24px 20px 140px; }

/* ---- chat ---- */
.intro { text-align: center; padding: 56px 12px 24px; }
.intro h1 { font-family: var(--font-display); font-size: 32px; margin: 8px 0; }
.intro p { color: var(--muted); max-width: 480px; margin: 0 auto; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 20px; }
.chip { border: 1px solid var(--line); background: var(--card); border-radius: 20px; padding: 8px 14px; font-size: 14px; color: var(--ink); }
.chip:hover { border-color: var(--blue); }

.turn { margin: 20px 0; }
.turn .who { font-size: 12px; color: var(--muted); font-family: var(--font-mono); margin-bottom: 4px; }
.turn .bubble { white-space: pre-wrap; }
.turn.user .bubble { color: var(--ink); }
.turn.bot .bubble { color: var(--ink); }
.turn.thinking .bubble { color: var(--muted); font-family: var(--font-mono); }

.trace { font-family: var(--font-mono); font-size: 12px; color: var(--muted); margin-top: 10px; }

.sources { margin-top: 10px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.sources .heading { font-size: 12px; color: var(--muted); padding: 8px 12px; background: #FBFAF6; border-bottom: 1px solid var(--line); font-family: var(--font-mono); }
.source-row { border-bottom: 1px solid var(--line); }
.source-row:last-child { border-bottom: 0; }
.source-summary { width: 100%; text-align: left; border: 0; border-radius: 0; background: transparent; padding: 8px 12px; font-family: var(--font-mono); font-size: 12px; color: var(--ink); display: flex; gap: 8px; }
.source-summary:hover { background: #FBFAF6; border-color: transparent; }
.source-num { color: var(--muted); }
.src-sep { color: var(--muted); }
.source-quote { padding: 0 12px 10px 30px; font-size: 13px; color: var(--muted); font-family: var(--font-body); }

.answer-actions { margin-top: 8px; display: flex; gap: 6px; }

.improve-form { margin-top: 8px; border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; background: #FBFAF6; }

/* composer docked at the bottom of the chat column */
.composer-dock { position: sticky; bottom: 0; background: linear-gradient(to top, var(--paper) 70%, transparent); padding: 12px 0; }
.composer { display: flex; gap: 8px; max-width: 760px; margin: 0 auto; padding: 0 20px; }
.composer textarea { min-height: 52px; max-height: 200px; }
.composer .send { align-self: flex-end; }

/* ---- workbench pages ---- */
.page-head { margin-bottom: 16px; }
.page-head h2 { font-family: var(--font-display); font-size: 24px; margin: 0 0 4px; }
.page-head p { color: var(--muted); margin: 0; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin-bottom: 12px; }
.card .meta { font-family: var(--font-mono); font-size: 12px; color: var(--muted); }
.card .q { font-weight: 600; margin: 4px 0; }
.card .actions { margin-top: 10px; display: flex; gap: 8px; }

.badge { font-family: var(--font-mono); font-size: 11px; padding: 2px 8px; border-radius: 12px; background: #EAF1FC; color: var(--blue); }
.badge.superseded { background: #F0EEE6; color: var(--muted); }
.badge.dismissed { background: #F5E6E6; color: #A05252; }
.badge.published { background: #E6F2E9; color: #3E7D53; }

.lib-item { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; }
.lib-item .title { font-weight: 600; }
.lib-item.superseded { opacity: 0.75; }

.paper-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; white-space: pre-wrap; font-size: 15px; }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

.hidden { display: none !important; }
.notice { font-size: 13px; color: var(--muted); margin-top: 8px; }
.error { color: #A05252; font-size: 13px; margin-top: 8px; }
.success { color: #3E7D53; font-size: 13px; margin-top: 8px; }

/* modal */
.modal-backdrop { position: fixed; inset: 0; background: rgba(16,32,51,0.35); display: flex; align-items: center; justify-content: center; z-index: 50; }
.modal { background: var(--card); border-radius: 14px; padding: 24px; max-width: 440px; width: calc(100% - 40px); }
.modal h3 { font-family: var(--font-display); margin: 0 0 8px; }
.modal p { color: var(--muted); margin: 0 0 16px; }
.modal .row { display: flex; gap: 8px; justify-content: flex-end; }