/* oden-chat-demo — 7th distinct surface flavor: scholarly margin-note
 * manuscript. Cream paper, sepia ink, ruled marginalia in Caveat
 * hand, classical serif body in Cormorant Garamond. Distinct from
 * the live oden-chat (black phosphor terminal). The demo is a
 * record, not a console.
 *
 * Risk-free demo surface per feedback_risk_free_demo_surface:
 * - no innerHTML
 * - no fetch / POST / mutation
 * - no PII capture
 * - sessionStorage at most (active conv index only)
 * - visible FIXTURE banner
 */

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

:root {
  --paper:     #f5edd6;
  --paper-2:   #ece2c4;
  --paper-3:   #e0d4ad;
  --rule:      #b6a26b;
  --rule-soft: #d8c897;
  --ink:       #322713;
  --ink-2:     #4f3f1f;
  --ink-soft:  #7a6533;
  --ink-dim:   #9a8757;
  --sepia:     #714a1a;
  --you:       #5b3a14;
  --oden:      #324a25;
  --warn:      #7a5219;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: 'Cormorant Garamond', 'EB Garamond', Georgia, serif;
  font-size: 16.5px;
  line-height: 1.6;
  min-height: 100vh;
  /* Subtle paper texture using two layered gradients. */
  background-image:
    repeating-linear-gradient(180deg, transparent 0 36px, rgba(122, 101, 51, .07) 36px 37px),
    radial-gradient(ellipse at 18% 6%, rgba(113, 74, 26, .12) 0%, transparent 60%),
    radial-gradient(ellipse at 86% 92%, rgba(113, 74, 26, .09) 0%, transparent 60%);
}

.fixture-banner {
  background: #3a2a14;
  color: #f5d68a;
  padding: 6px 14px;
  font: 500 12.5px/1.4 "IBM Plex Mono", monospace;
  letter-spacing: 0.05em;
  text-align: center;
  border-bottom: 1px solid #d8a440;
}

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 24px 36px 14px;
  border-bottom: 1.5px solid var(--rule);
  background: linear-gradient(180deg, var(--paper-2) 0%, var(--paper) 100%);
}
.mast-l { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.mast-r { display: flex; align-items: baseline; gap: 10px; }
.mast-orn { font-size: 22px; color: var(--sepia); }
.mast-title {
  font: 600 1.45rem 'Cormorant Garamond', serif;
  color: var(--ink);
  letter-spacing: 0.01em;
}
.mast-sub {
  font: italic 400 0.94rem 'Cormorant Garamond', serif;
  color: var(--ink-soft);
}
.mast-link {
  color: var(--sepia);
  text-decoration: none;
  font: 500 0.82rem 'IBM Plex Mono', monospace;
  letter-spacing: 0.05em;
  border-bottom: 1px dotted transparent;
}
.mast-link:hover { border-bottom-color: var(--sepia); }
.mast-sep { color: var(--rule-soft); }

.manuscript {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 36px 36px;
  display: grid;
  grid-template-columns: 240px 1fr;
  grid-template-areas:
    "margin picker"
    "margin conversation"
    "colophon colophon";
  gap: 24px 36px;
}

.margin-note {
  grid-area: margin;
  padding: 14px 16px 16px;
  border-left: 1.5px solid var(--rule);
  background: transparent;
}
.margin-h {
  margin: 0 0 8px;
  font: 600 0.98rem 'Caveat', cursive;
  color: var(--sepia);
  letter-spacing: 0.02em;
  font-size: 1.2rem;
}
.margin-note p {
  margin: 0 0 12px;
  font: 400 1.05rem 'Caveat', cursive;
  color: var(--ink-2);
  line-height: 1.5;
}
.margin-foot {
  border-top: 1px dotted var(--rule-soft);
  padding-top: 10px;
  font-size: 0.98rem !important;
  color: var(--ink-soft) !important;
}

.picker {
  grid-area: picker;
}
.picker-h {
  margin: 0 0 10px;
  font: 500 1.05rem 'IBM Plex Mono', monospace;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.picker-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.pick {
  background: var(--paper-2);
  border: 1px solid var(--rule-soft);
  border-radius: 2px;
  padding: 12px 14px 13px;
  cursor: pointer;
  text-align: left;
  font: inherit;
  color: inherit;
  transition: background .12s, border-color .12s;
}
.pick:hover { background: var(--paper-3); border-color: var(--rule); }
.pick.active {
  background: var(--paper-3);
  border-color: var(--sepia);
  box-shadow: inset 3px 0 0 var(--sepia);
}
.pick-label {
  display: block;
  font: 500 0.74rem 'IBM Plex Mono', monospace;
  color: var(--ink-soft);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.pick-title {
  display: block;
  margin-top: 4px;
  font: 600 1.12rem 'Cormorant Garamond', serif;
  color: var(--ink);
  line-height: 1.3;
}

.conversation {
  grid-area: conversation;
  border: 1.5px solid var(--rule);
  background: var(--paper-2);
  padding: 22px 26px 24px;
  position: relative;
}
.conversation::before {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid var(--rule-soft);
  pointer-events: none;
}
.conv-head {
  border-bottom: 1px dotted var(--rule);
  padding-bottom: 12px;
  margin-bottom: 14px;
}
.conv-title {
  margin: 0 0 4px;
  font: 600 1.32rem 'Cormorant Garamond', serif;
  color: var(--ink);
}
.conv-blurb {
  margin: 0 0 6px;
  font: italic 400 0.98rem 'Cormorant Garamond', serif;
  color: var(--ink-2);
}
.conv-meta {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
}
.conv-meta li {
  font: 500 0.72rem 'IBM Plex Mono', monospace;
  color: var(--ink-soft);
  letter-spacing: 0.06em;
}
.conv-meta b {
  color: var(--ink-2);
  font-weight: 600;
}

.conv-thread {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.turn {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 12px;
  align-items: baseline;
}
.turn-who {
  font: 500 0.74rem 'IBM Plex Mono', monospace;
  color: var(--ink-soft);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: right;
  border-right: 1.5px solid var(--rule-soft);
  padding-right: 12px;
  padding-top: 2px;
}
.turn.user .turn-who { color: var(--you); }
.turn.oden .turn-who { color: var(--oden); }
.turn-body {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.07rem;
  line-height: 1.62;
  color: var(--ink);
  white-space: pre-wrap;
}
.turn.user .turn-body {
  font-style: italic;
  color: var(--you);
}
.turn.oden .turn-body {
  color: var(--ink);
}
.turn-meta {
  margin-top: 4px;
  font: 400 0.72rem 'IBM Plex Mono', monospace;
  color: var(--ink-dim);
  letter-spacing: 0.04em;
}

.conv-foot {
  margin-top: 16px;
  padding-top: 10px;
  border-top: 1px dotted var(--rule);
  font: italic 400 0.92rem 'Cormorant Garamond', serif;
  color: var(--ink-soft);
}

.colophon {
  grid-area: colophon;
  margin-top: 10px;
  padding-top: 16px;
  border-top: 1.5px solid var(--rule);
}
.colophon-h {
  margin: 0 0 6px;
  font: 600 0.92rem 'IBM Plex Mono', monospace;
  color: var(--ink-soft);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.colophon p {
  margin: 0 0 8px;
  font-size: 1.03rem;
  color: var(--ink-2);
  max-width: 78ch;
}

.foot {
  text-align: center;
  padding: 16px 12px 22px;
  color: var(--ink-dim);
  font: 400 0.78rem 'IBM Plex Mono', monospace;
  letter-spacing: 0.05em;
  border-top: 1px solid var(--rule-soft);
  background: var(--paper-2);
}

@media (max-width: 760px) {
  .manuscript {
    grid-template-columns: 1fr;
    grid-template-areas:
      "picker"
      "conversation"
      "margin"
      "colophon";
    padding: 18px 18px 24px;
  }
  .margin-note { border-left: none; border-top: 1.5px solid var(--rule); padding-top: 14px; }
  .turn { grid-template-columns: 64px 1fr; gap: 10px; }
  .turn-who { padding-right: 8px; }
  .mast-l { gap: 8px; }
  .mast-r { gap: 8px; }
}