/* ===================================================================
   Reading room — the chat surface
   Sidebar reads as a card catalogue; answers are typeset like a
   journal column, with citations set as marginal references.
   =================================================================== */

.app {
  display: grid;
  grid-template-columns: 296px minmax(0, 1fr);
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

/* ---------- Sidebar ---------- */
.sidebar {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--paper-sunk);
  border-right: 1px solid var(--rule);
}

.sidebar__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-5);
  border-bottom: 1px solid var(--rule);
}

.sidebar__logo .wordmark__text { font-size: var(--t-md); }
.sidebar__logo .wordmark__mark { color: var(--navy); }

.sidebar__close { display: none; }

.sidebar__new {
  margin: var(--space-5) var(--space-5) var(--space-3);
  width: calc(100% - var(--space-5) * 2);
}

.sidebar__scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: var(--space-3) var(--space-5) var(--space-5);
}

.sidebar__section + .sidebar__section { margin-top: var(--space-6); }

.sidebar__section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--sans);
  font-size: var(--t-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-3);
  border-bottom: 1px solid var(--rule);
}

.sidebar__badge {
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0;
  color: var(--gold);
}

.sidebar__list { display: grid; gap: 1px; }

/* Catalogue card */
.sidebar__item {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--r-md);
  cursor: pointer;
  color: var(--ink-soft);
  font-size: var(--t-sm);
  transition: background-color var(--dur-fast) var(--ease-soft),
              color var(--dur-fast) var(--ease-soft);
}

/* Gold tab on the active/hovered card, like a tabbed index divider */
.sidebar__item::before {
  content: '';
  position: absolute;
  left: 0; top: 50%;
  width: 2px; height: 0;
  background: var(--gold);
  transform: translateY(-50%);
  transition: height var(--dur-base) var(--ease-out);
}

.sidebar__item:hover { background: var(--paper-wash); color: var(--ink); }
.sidebar__item:hover::before { height: 60%; }

.sidebar__item.active {
  background: var(--paper-raised);
  color: var(--ink);
  box-shadow: var(--lift-1);
}

.sidebar__item.active::before { height: 100%; }

.sidebar__item-icon { display: flex; color: var(--ink-faint); }
.sidebar__item.active .sidebar__item-icon { color: var(--gold); }

.sidebar__item-text {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar__item-meta {
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--ink-faint);
  white-space: nowrap;
}

.sidebar__item-delete {
  display: grid;
  place-items: center;
  width: 26px; height: 26px;
  border-radius: var(--r-sm);
  color: var(--ink-faint);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-soft),
              color var(--dur-fast) var(--ease-soft);
}

.sidebar__item:hover .sidebar__item-delete { opacity: 1; }
.sidebar__item-delete:hover { color: var(--err); background: var(--err-wash); }
.sidebar__item-delete:focus-visible { opacity: 1; }

.sidebar__empty {
  padding: var(--space-4) var(--space-3);
  font-size: var(--t-sm);
  font-style: italic;
  color: var(--ink-faint);
  font-family: var(--serif);
}

/* ---------- Upload ---------- */
.sidebar__upload { padding: 0 var(--space-5) var(--space-4); }

.upload-zone {
  display: grid;
  justify-items: center;
  gap: var(--space-2);
  padding: var(--space-5) var(--space-4);
  border: 1px dashed var(--rule-strong);
  border-radius: var(--r-md);
  color: var(--ink-faint);
  font-size: var(--t-xs);
  text-align: center;
  cursor: pointer;
  transition: border-color var(--dur-base) var(--ease-soft),
              background-color var(--dur-base) var(--ease-soft),
              color var(--dur-base) var(--ease-soft);
}

.upload-zone:hover,
.upload-zone:focus-visible {
  border-color: var(--gold);
  color: var(--ink-soft);
  background: var(--gold-wash);
}

.upload-zone strong { color: var(--gold); }

.upload-zone.drag-over {
  border-color: var(--gold);
  border-style: solid;
  background: var(--gold-wash);
  color: var(--ink);
}

.upload-progress { margin-top: var(--space-3); }

.upload-progress__bar {
  height: 2px;
  background: var(--rule);
  border-radius: 999px;
  overflow: hidden;
}

.upload-progress__fill {
  height: 100%;
  width: 0;
  background: var(--gold);
  transition: width var(--dur-base) var(--ease-soft);
}

.upload-progress__text {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--t-xs);
  color: var(--ink-faint);
}

/* ---------- Account ---------- */
.sidebar__account {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--rule);
}

.sidebar__account-info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
  flex: 1;
}

.sidebar__avatar {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  background: var(--navy);
  color: var(--paper-raised);
  border-radius: var(--r-md);
  font-family: var(--serif);
  font-size: var(--t-base);
  font-weight: 600;
}

.sidebar__account-text { display: grid; min-width: 0; }

.sidebar__account-name,
.sidebar__account-email {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar__account-name { font-size: var(--t-sm); font-weight: 700; }
.sidebar__account-email { font-size: var(--t-xs); color: var(--ink-faint); }

/* ---------- Chat column ---------- */
.chat {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--paper);
}

.chat__header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--rule);
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.chat__menu { display: none; }

.chat__runninghead { flex: 1; min-width: 0; }

.chat__runninghead-label {
  display: block;
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.chat__title {
  font-family: var(--serif);
  font-size: var(--t-md);
  font-weight: 500;
  letter-spacing: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ---------- Messages ---------- */
.chat__messages {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: var(--space-8) var(--space-6) var(--space-6);
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  .chat__messages { scroll-behavior: auto; }
}

/* Welcome */
.chat__welcome {
  max-width: var(--measure);
  margin: clamp(1rem, 6vh, 4rem) auto 0;
  animation: settle var(--dur-page) var(--ease-out) both;
}

@keyframes settle {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: none; }
}

.chat__welcome-title { font-size: var(--t-2xl); margin: var(--space-4) 0 var(--space-3); }

.chat__welcome-lede {
  font-family: var(--serif);
  font-size: var(--t-md);
  line-height: var(--lead-relaxed);
  color: var(--ink-soft);
  margin-bottom: var(--space-7);
}

.chat__suggestions { display: grid; gap: 1px; border-top: 1px solid var(--rule); }

.chat__suggestion {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr) auto;
  align-items: baseline;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-4) var(--space-2);
  border-bottom: 1px solid var(--rule);
  text-align: left;
  font-size: var(--t-sm);
  color: var(--ink-soft);
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease-soft),
              color var(--dur-fast) var(--ease-soft),
              padding-left var(--dur-base) var(--ease-out);
}

.chat__suggestion:hover {
  background: var(--gold-wash);
  color: var(--ink);
  padding-left: var(--space-4);
}

.chat__suggestion .folio { color: var(--gold); }

.chat__suggestion-hint {
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--ink-faint);
  white-space: nowrap;
}

/* --- Message rows --- */
.message {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: var(--space-4);
  max-width: 46rem;
  margin: 0 auto var(--space-7);
  animation: settle var(--dur-slow) var(--ease-out) both;
}

.message__avatar {
  display: grid;
  place-items: center;
  width: 2rem; height: 2rem;
  border-radius: var(--r-md);
  color: var(--paper-raised);
  background: var(--navy);
}

/* The reader's own question — a query slip, set quietly */
.message--user .message__bubble {
  font-family: var(--sans);
  font-size: var(--t-sm);
  color: var(--ink-soft);
  padding: var(--space-3) var(--space-4);
  background: var(--paper-sunk);
  border-left: 2px solid var(--rule-strong);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

.message--user .message__avatar {
  background: transparent;
  border: 1px solid var(--rule-strong);
  color: var(--ink-faint);
  font-size: var(--t-xs);
  font-weight: 700;
}

/* The answer — typeset as a journal column */
.message--bot .message__bubble {
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: var(--lead-relaxed);
  color: var(--ink);
}

.message--bot .message__bubble p { margin-bottom: var(--space-4); }
.message--bot .message__bubble p:last-child { margin-bottom: 0; }

.message--bot .message__bubble strong { font-weight: 600; }

.message--bot .message__bubble ol,
.message--bot .message__bubble ul {
  margin: 0 0 var(--space-4) var(--space-5);
  display: grid;
  gap: var(--space-2);
}

.message--bot .message__bubble ol > li { list-style: decimal outside; }
.message--bot .message__bubble ul > li { list-style: disc outside; }
.message--bot .message__bubble li::marker { color: var(--ink-faint); }

/* Headings inside an answer: section labels, not page titles */
.message__h {
  font-family: var(--sans);
  font-size: var(--t-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: var(--space-5) 0 var(--space-2);
}

.message__h:first-child { margin-top: 0; }

/* Comparison tables, which the model writes for "compare" questions */
.message__table {
  overflow-x: auto;
  margin: 0 0 var(--space-4);
}

.message__table table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: var(--t-sm);
  line-height: var(--lead-normal);
}

.message__table th,
.message__table td {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--rule);
  text-align: left;
  vertical-align: top;
}

.message__table th {
  font-weight: 700;
  color: var(--ink-soft);
  border-bottom-color: var(--rule-strong);
}

/* A statement the claim check could not find in the papers */
.message--bot .message__bubble .is-unverified {
  text-decoration: underline dotted var(--warn);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 0.22em;
  cursor: help;
}

.message--bot .message__bubble code {
  font-family: var(--mono);
  font-size: 0.86em;
  padding: 0.1em 0.35em;
  background: var(--paper-sunk);
  border-radius: var(--r-sm);
}

/* Inline citation, set like a reference mark */
.message__cite {
  color: var(--gold);
  font-size: 0.88em;
  white-space: nowrap;
}

/* Streaming caret */
.message__bubble--streaming::after {
  content: '';
  display: inline-block;
  width: 2px; height: 1.05em;
  margin-left: 2px;
  vertical-align: text-bottom;
  background: var(--gold);
  animation: caret 1s step-end infinite;
}

@keyframes caret { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

@media (prefers-reduced-motion: reduce) {
  .message__bubble--streaming::after { animation: none; }
  .message, .chat__welcome { animation: none; }
}

/* Footer under an answer: the claim check and the sources, one line,
   each expandable. Opened, a panel takes the full width under the line. */
.message__footer {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: var(--space-2) var(--space-4);
  margin-top: var(--space-5);
  padding-top: var(--space-3);
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: var(--t-xs);
  line-height: var(--lead-normal);
  color: var(--ink-faint);
}

.message__footer details[open] { flex-basis: 100%; order: 1; }

.message__footer summary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  list-style: none;
  user-select: none;
  border-radius: var(--r-sm);
  transition: color var(--dur-fast) var(--ease-soft);
}

.message__footer summary::-webkit-details-marker { display: none; }

.message__footer summary::after {
  content: '';
  width: 0.4em; height: 0.4em;
  margin-left: 0.1em;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-0.12em) rotate(45deg);
  transition: transform var(--dur-fast) var(--ease-soft);
}

.message__footer details[open] > summary::after { transform: translateY(0.08em) rotate(-135deg); }
.message__footer summary:hover { color: var(--ink); }

.message__refs {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.message__ref {
  display: grid;
  grid-template-columns: 1.75rem minmax(0, 1fr);
  gap: var(--space-2);
  color: var(--ink-soft);
}

.message__ref-num { color: var(--gold); font-family: var(--mono); }

/* Claim check */
.message__check { display: inline-flex; align-items: center; gap: var(--space-2); }
details.message__check { display: block; }

.message__check-mark {
  display: inline-grid;
  place-items: center;
  width: 1.15rem; height: 1.15rem;
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 700;
}

.message__check--ok { cursor: help; }
.message__check--ok .message__check-mark {
  color: var(--ok);
  background: color-mix(in srgb, var(--ok) 14%, transparent);
}

.message__check--warn summary { color: var(--warn); }
.message__check--warn .message__check-mark {
  color: var(--warn);
  background: color-mix(in srgb, var(--warn) 16%, transparent);
}

.message__check-body { margin-top: var(--space-3); }

.message__check-note {
  margin: 0 0 var(--space-3);
  color: var(--ink-soft);
}

.message__check-claim {
  margin-top: var(--space-3);
  padding-left: var(--space-3);
  border-left: 2px solid var(--warn);
}

.message__check-text { margin: 0; color: var(--ink); }

.message__check-evidence {
  margin: var(--space-1) 0 0;
  color: var(--ink-soft);
}

.message__check-vote {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
  font-size: 0.8rem;
  color: var(--ink-faint);
}

.message__check-vote button {
  font: inherit;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--rule, currentColor);
  border-radius: 999px;
  padding: 2px 10px;
  cursor: pointer;
}

.message__check-vote button:hover:not(:disabled) {
  color: var(--ink);
  border-color: var(--ink-soft);
}

.message__check-vote button:disabled { opacity: 0.5; cursor: default; }

.message__check-evidence span {
  display: block;
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.65rem;
  color: var(--ink-faint);
}

/* File chip */
.message__file {
  display: inline-grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--paper-raised);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--gold);
  border-radius: var(--r-md);
  font-family: var(--sans);
  font-size: var(--t-sm);
}

.message__file-icon { display: flex; color: var(--gold); }
.message__file-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.message__file-size { font-family: var(--mono); font-size: var(--t-xs); color: var(--ink-faint); }

/* System note */
.message--system,
.chat__system {
  max-width: 46rem;
  margin: 0 auto var(--space-5);
  padding: var(--space-3) var(--space-4);
  font-family: var(--sans);
  font-size: var(--t-sm);
  font-style: italic;
  color: var(--ink-faint);
  border-left: 2px solid var(--rule-strong);
}

/* ---------- Typing ---------- */
.typing-indicator {
  display: grid;
  grid-template-columns: 2rem auto auto;
  align-items: center;
  gap: var(--space-4);
  max-width: 46rem;
  margin: 0 auto var(--space-7);
}

.typing-dots { display: flex; gap: 5px; }

.typing-dots span {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--gold);
  animation: pulse 1.3s ease-in-out infinite;
}

.typing-dots span:nth-child(2) { animation-delay: 0.16s; }
.typing-dots span:nth-child(3) { animation-delay: 0.32s; }

@keyframes pulse {
  0%, 60%, 100% { opacity: 0.25; transform: translateY(0); }
  30%           { opacity: 1;    transform: translateY(-3px); }
}

@media (prefers-reduced-motion: reduce) {
  .typing-dots span { animation: none; opacity: 0.7; }
}

.typing-label {
  font-size: var(--t-xs);
  font-style: italic;
  font-family: var(--serif);
  color: var(--ink-faint);
}

/* ---------- Composer ---------- */
.chat__input-area {
  padding: var(--space-4) var(--space-6) var(--space-5);
  border-top: 1px solid var(--rule);
  background: var(--paper);
}

.chat__input-bar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: end;
  gap: var(--space-2);
  max-width: 46rem;
  margin: 0 auto;
  padding: var(--space-2);
  background: var(--paper-raised);
  border: 1px solid var(--rule-strong);
  border-radius: var(--r-lg);
  box-shadow: var(--lift-1);
  transition: border-color var(--dur-base) var(--ease-soft),
              box-shadow var(--dur-base) var(--ease-soft);
}

.chat__input-bar:focus-within {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px var(--gold-wash), var(--lift-2);
}

.chat__textarea {
  width: 100%;
  max-height: 200px;
  padding: var(--space-3) var(--space-2);
  background: none;
  border: none;
  resize: none;
  font-family: var(--sans);
  font-size: var(--t-base);
  line-height: var(--lead-normal);
  color: var(--ink);
}

.chat__textarea:focus { outline: none; }
.chat__textarea::placeholder { color: var(--ink-faint); }

.chat__send { min-width: 44px; padding-inline: var(--space-4); }

.chat__disclaimer {
  max-width: 46rem;
  margin: var(--space-3) auto 0;
  font-size: var(--t-xs);
  color: var(--ink-faint);
  text-align: center;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 60;
    width: min(88vw, 320px);
    transform: translateX(-100%);
    transition: transform var(--dur-base) var(--ease-out);
    box-shadow: var(--lift-3);
  }

  .sidebar.open { transform: none; }
  .sidebar__close { display: inline-flex; }
  .chat__menu { display: inline-flex; }

  .sidebar-overlay {
    position: fixed;
    inset: 0;
    z-index: 50;
    background: rgba(20, 33, 46, 0.4);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--dur-base) var(--ease-soft);
  }

  .sidebar-overlay.visible { opacity: 1; pointer-events: auto; }

  .chat__messages { padding: var(--space-6) var(--space-4); }
  .chat__input-area { padding: var(--space-3) var(--space-4) var(--space-4); }
}

@media (prefers-reduced-motion: reduce) {
  .sidebar { transition: none; }
}

/* ══ Account dialog ═══════════════════════════════════════════════════
   A native <dialog>, so focus trapping, Escape and the inert backdrop are
   the browser's job rather than three more listeners in chat.js.
*/
.modal {
  /* The reset zeroes every margin, which takes `margin: auto` off <dialog>
     and pins it to the top-left instead of centring it. */
  margin: auto;
  width: min(92vw, 26rem);
  /* Capped and scrollable rather than growing past the viewport: on a short
     screen the form is taller than the window, and a <dialog> that overflows
     puts its submit button somewhere unreachable. */
  max-height: calc(100vh - 2 * var(--space-6));
  overflow-y: auto;
  padding: var(--space-6);
  border: 1px solid var(--rule);
  border-radius: var(--r-lg);
  background: var(--paper-raised);
  color: var(--ink);
  box-shadow: var(--lift-3);
}

.modal::backdrop {
  background: rgba(20, 33, 46, 0.44);
  backdrop-filter: blur(2px);
}

.modal__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-2);
}

.modal__title { font-size: var(--t-xl); margin: 0; }

.modal__meta {
  color: var(--ink-soft);
  font-size: var(--t-sm);
  margin: 0 0 var(--space-6);
  word-break: break-all;
}

.modal__section {
  font-size: var(--t-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 var(--space-4);
}

.modal__note {
  color: var(--ink-soft);
  font-size: var(--t-sm);
  line-height: var(--lead-snug);
  margin: 0 0 var(--space-4);
}

.modal__status {
  display: block;
  margin-bottom: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--r-sm);
  font-size: var(--t-sm);
  line-height: var(--lead-snug);
}

.modal__status[data-tone="error"] {
  background: var(--err-wash);
  border-left: 2px solid var(--err);
  color: var(--err);
}

/* There is no --ok-wash token, and reusing --gold-wash put a brown box behind
   green text. Mixed from --ok so it tracks the token in both themes. */
.modal__status[data-tone="ok"] {
  background: color-mix(in srgb, var(--ok) 12%, transparent);
  border-left: 2px solid var(--ok);
  color: var(--ok);
}

.modal__submit { width: 100%; }

.modal__divider {
  height: 1px;
  background: var(--rule);
  margin: var(--space-6) 0;
}

.modal__danger { width: 100%; color: var(--err); }
.modal__danger:hover { border-color: var(--err); }

@media (max-width: 480px) {
  .modal { padding: var(--space-5); }
}