/* Chat demo (namespaced under body.demo-slack).
   Three columns on the same rules: dark rail, conversation, thread panel.
   The thread column exists only when a thread is open (?thread= in the URL);
   the grid collapses to two columns otherwise. */

.demo-slack .slack {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  height: calc(100vh - 46px);
}

.demo-slack .slack.thread-open {
  grid-template-columns: 250px minmax(0, 1fr) 330px;
}

/* --- Rail ------------------------------------------------------------------ */

.demo-slack .sidebar {
  background: var(--ink);
  color: var(--paper);
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.demo-slack .sidebar-header {
  padding: 0.9rem 1.15rem;
  border-bottom: 2px solid var(--paper);
}

.demo-slack .sidebar-header .brand {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.demo-slack .sidebar-header .micro-label { margin-top: 0.2rem; color: #8f8f8f; }

.demo-slack .sidebar-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 0.9rem 0;
}

.demo-slack .sidebar section + section { margin-top: 1.15rem; }

.demo-slack .sidebar section .micro-label { padding: 0 1.15rem; color: #8f8f8f; }

.demo-slack .sidebar section ul {
  list-style: none;
  margin: 0.35rem 0 0;
  padding: 0;
}

.demo-slack .sidebar section li a {
  display: grid;
  grid-template-columns: 14px 1fr auto;
  align-items: center;
  gap: 0.6rem;
  padding: 0.32rem 1.15rem;
  font-size: 0.9rem;
  color: var(--paper);
  text-decoration: none;
}

.demo-slack .sidebar section li a .hash { color: var(--muted); font-weight: 700; }
.demo-slack .sidebar section li a .dot { width: 7px; height: 7px; background: var(--red); }
.demo-slack .sidebar section li a .count {
  font-family: ui-monospace, Menlo, monospace;
  font-size: 0.65rem;
  color: #8f8f8f;
}

.demo-slack .sidebar section li.active a { color: var(--red); font-weight: 700; }
.demo-slack .sidebar section li.active a .hash { color: var(--red); }
.demo-slack .sidebar section li a:hover { color: var(--red); }

.demo-slack .sidebar .roster li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.22rem 1.15rem;
  font-size: 0.85rem;
  color: #c9c9c9;
}

.demo-slack .sidebar .roster .dot { width: 7px; height: 7px; background: var(--red); }

.demo-slack .sidebar-footer {
  border-top: 2px solid var(--paper);
  padding: 0.8rem 1.15rem;
}

.demo-slack .sidebar-footer .outbox-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 0 0 0.7rem;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: #8f8f8f;
}

.demo-slack .sidebar-footer .outbox-row .count {
  font-family: ui-monospace, Menlo, monospace;
  color: var(--red);
}

.demo-slack .sidebar-footer button {
  width: 100%;
  background: transparent;
  color: var(--paper);
  border-color: var(--paper);
}

.demo-slack .sidebar-footer button:hover {
  background: var(--red);
  border-color: var(--red);
}

/* --- Conversation ----------------------------------------------------------
   The message list scrolls, the chrome stays put — infinite scroll needs one
   stable scroll container to anchor against. */

.demo-slack .conversation {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  border-right: 2px solid var(--rule);
}

.demo-slack .conversation-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 1.5rem;
  height: 56px;
  box-sizing: border-box;
  border-bottom: 2px solid var(--rule);
}

.demo-slack .conversation-header .room {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  min-width: 0;
}

.demo-slack .conversation-header h2 {
  margin: 0;
  font-size: 1.4rem;
  letter-spacing: -0.03em;
  white-space: nowrap;
}

.demo-slack .conversation-header .hash { color: var(--red); }

.demo-slack .conversation-header .room-meta {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.demo-slack .conversation-header .pending-badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--red);
  border: 1px solid var(--red);
  padding: 0.15rem 0.4rem;
  white-space: nowrap;
}

.demo-slack .message-scroll {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  padding: 0 1.5rem;
  /* prependHistory anchors the viewport manually (Safari has no native
     anchoring); leaving this on double-compensates when history pages are
     prefetched mid-scroll and throws the reader to the bottom. */
  overflow-anchor: none;
}

.demo-slack ol.messages {
  list-style: none;
  margin: 0;
  padding: 0 0 1rem;
}

/* The sentinel and the beginning marker are two states of the same slot at the
   top of the scrollback. The browser runtime renders has_more=true optimistically
   (its database holds only the synced window), so the first history probe always
   swaps one for the other — matching their boxes keeps that swap from shifting
   every message below it. */
.demo-slack .history-sentinel,
.demo-slack .beginning-marker {
  min-height: 2.75rem;
  padding: 0.6rem 0;
  text-align: center;
  border-bottom: 2px solid transparent;
}

.demo-slack .history-sentinel {
  font-size: 0.7rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.demo-slack .history-sentinel[data-state="offline"] { color: var(--red); }

/* The slot's resolved state: scrollback is complete. Styled to match the
   server-rendered .beginning-marker, since either can hold the label. */
.demo-slack .history-sentinel[data-state="beginning"],
.demo-slack .beginning-marker {
  border-bottom-color: var(--rule);
}

/* --- Message rows: avatar tile + content ----------------------------------- */

.demo-slack ol.messages li {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 0.9rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--hairline);
}

.demo-slack ol.messages li.beginning-marker {
  display: block;
  border-top: 0;
}

.demo-slack .tile {
  width: 32px;
  height: 32px;
  background: var(--ink);
  color: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 700;
}

.demo-slack li.own .tile,
.demo-slack .thread-parent.own .tile { background: var(--red); }

.demo-slack .message-main { min-width: 0; }

.demo-slack .message-head {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.demo-slack .message-head .author {
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.demo-slack li.own .message-head .author,
.demo-slack .thread-parent.own .message-head .author { color: var(--red); }

.demo-slack .message-head .timestamp {
  font-family: ui-monospace, Menlo, monospace;
  font-size: 0.65rem;
  color: var(--muted);
}

.demo-slack .message-head .flag {
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--red);
}

.demo-slack .message-main .body {
  margin: 0.25rem 0 0;
  font-size: 0.95rem;
  line-height: 1.5;
  overflow-wrap: anywhere; /* long unbroken strings must not widen the page */
}

/* The thread affordance. With replies it is part of the row's information and
   stays visible; without, it is an action and waits for the pointer. */
.demo-slack .thread-link {
  display: inline-block;
  margin-top: 0.4rem;
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  text-decoration: none;
  color: var(--muted);
  visibility: hidden;
}

.demo-slack ol.messages li:hover .thread-link { visibility: visible; }

.demo-slack .thread-link.has-replies {
  visibility: visible;
  color: var(--red);
}

.demo-slack .thread-link:hover { color: var(--red); }

/* --- Composer -------------------------------------------------------------- */

.demo-slack .composer {
  display: flex;
  align-items: stretch;
  gap: 0;
  border-top: 2px solid var(--rule);
  height: 56px;
  box-sizing: border-box;
}

.demo-slack .composer input[type="text"] {
  flex: 1;
  border: 0;
  padding: 0 1.5rem;
  font-size: 0.95rem;
  outline: none;
}

.demo-slack .composer input[type="submit"] {
  border: 0;
  border-left: 2px solid var(--rule);
  background: var(--ink);
  color: var(--paper);
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  padding: 0 1.6rem;
  cursor: pointer;
}

.demo-slack .composer input[type="submit"]:hover { background: var(--red); }

/* --- Thread panel ----------------------------------------------------------- */

.demo-slack .thread-panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.demo-slack .thread-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  height: 56px;
  box-sizing: border-box;
  border-bottom: 2px solid var(--rule);
}

.demo-slack .thread-close {
  font-size: 1rem;
  color: var(--muted);
  text-decoration: none;
}

.demo-slack .thread-close:hover { color: var(--red); }

.demo-slack .thread-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 1rem 1.25rem;
}

.demo-slack .thread-parent {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 0.75rem;
  padding-bottom: 0.9rem;
  border-bottom: 2px solid var(--rule);
}

.demo-slack .thread-parent .tile { width: 28px; height: 28px; font-size: 0.6rem; }

.demo-slack ol.thread-replies {
  list-style: none;
  margin: 0;
  padding: 0;
}

.demo-slack ol.thread-replies li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--hairline);
}

/* Replies get outlined tiles; the parent keeps the filled one. */
.demo-slack ol.thread-replies .tile {
  width: 28px;
  height: 28px;
  font-size: 0.6rem;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}

.demo-slack ol.thread-replies li.own .tile {
  background: var(--red);
  color: var(--paper);
  border-color: var(--red);
}

.demo-slack .thread-composer {
  display: flex;
  align-items: center;
  border-top: 2px solid var(--rule);
  height: 56px;
  box-sizing: border-box;
  padding: 0 1.25rem;
}

.demo-slack .thread-composer input[type="text"] {
  width: 100%;
  font-size: 0.85rem;
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--rule);
  outline: none;
}

/* --- Small screens ---------------------------------------------------------- */

@media (max-width: 960px) {
  .demo-slack .slack,
  .demo-slack .slack.thread-open { grid-template-columns: 1fr; height: auto; }
  .demo-slack .conversation { height: 70vh; border-right: 0; }
  .demo-slack .thread-panel { border-top: 2px solid var(--rule); }
}