/*
 * Multiplayer chat preview (#multiplayer). A real Houston shared chat in the
 * app's light theme: an agent header, a thread where MULTIPLE people (photo
 * avatars) and the agent (a tinted Houston helmet) talk, and a composer. Tabs
 * above switch the use case (assets/chat.js). App palette from site-tokens.css
 * (--app-* / --agent-*); the shared .win / .av / .face rules live in
 * landing-app-window.css.
 */

.chat-demo {
  max-width: 780px;
  margin: clamp(28px, 3.4vw, 44px) auto 0;
}

/* ── Use-case tabs — ONE segmented pill (instrument-panel clean) ─────────── */
.chat-tabs {
  display: flex;
  width: max-content;
  max-width: 100%;
  overflow-x: auto;
  margin: 0 auto clamp(20px, 2.6vw, 30px);
  padding: 4px;
  gap: 2px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
}
.chat-tab {
  padding: 7px 16px;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: var(--ink-muted);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease-standard),
    background-color var(--dur-fast) var(--ease-standard);
}
.chat-tab:hover {
  color: var(--ink-strong);
}
.chat-tab.active {
  background: var(--action);
  color: var(--action-text);
}

/* ── The chat window (reuses .win chrome: border, radius, system font) ─────── */
.chat-win {
  background: var(--app-screen);
  display: flex;
  flex-direction: column;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05),
    0 32px 64px -22px rgba(0, 0, 0, 0.18),
    0 64px 120px -48px rgba(0, 0, 0, 0.22);
}

.chat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 20px;
  border-bottom: 1px solid var(--app-line);
}
.chat-agent {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.chat-agent .av {
  width: 34px;
  height: 34px;
}
.chat-agent-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.chat-agent-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--app-ink);
  letter-spacing: -0.01em;
}
.chat-mission {
  font-size: 12px;
  color: var(--app-ink-muted);
}
.chat-people {
  display: inline-flex;
  flex-shrink: 0;
}
.chat-people .face {
  width: 26px;
  height: 26px;
}

/* ── Thread ───────────────────────────────────────────────────────────────── */
.chat-thread {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 20px;
  /* Fixed window: the replay scrolls inside like a real chat instead of
     growing the section (chat.js pins the scroll to the newest message). */
  height: clamp(320px, 46vh, 420px);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
}
.cmsg {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.cmsg-av {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  flex-shrink: 0;
}
.cmsg-main {
  min-width: 0;
  flex: 1;
}
.cmsg-name {
  display: block;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--app-ink);
  margin-bottom: 3px;
  letter-spacing: -0.01em;
}
.cmsg-text {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--app-ink);
}
/* The agent's turn reads as AI output: a subtle tinted card with a squared
   top-left corner pointing back at the helmet. Human turns stay plain thread. */
.cmsg-agent .cmsg-text {
  display: inline-block;
  background: var(--app-chip);
  padding: 9px 12px;
  border-radius: 12px;
  border-top-left-radius: 3px;
}

/* Typing indicator — three bouncing dots in the agent's tinted bubble, shown by
   assets/chat.js just before each agent turn lands. */
.cmsg-dots {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 11px 12px;
}
.cmsg-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--app-ink-muted);
  opacity: 0.4;
}
@media (prefers-reduced-motion: no-preference) {
  .cmsg-dots span {
    animation: typing-bounce 1.2s ease-in-out infinite;
  }
  .cmsg-dots span:nth-child(2) { animation-delay: 0.15s; }
  .cmsg-dots span:nth-child(3) { animation-delay: 0.3s; }
  /* Each replayed turn rises in (gated: the settled thread never animates). */
  .cmsg-in {
    animation: cmsg-in var(--dur-elegant) var(--ease-entrance);
  }
}
@keyframes cmsg-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* Invisible in-page anchor alias (e.g. #features) — a zero-height scroll target
   that keeps cross-site links resolving, clearing the sticky nav. */
.anchor-alias {
  display: block;
  height: 0;
  scroll-margin-top: 84px;
}

/* ── Composer (mock) ──────────────────────────────────────────────────────── */
.chat-composer {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-top: 1px solid var(--app-line);
}
.cc-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  flex-shrink: 0;
}
.cc-placeholder {
  flex: 1;
  min-width: 0;
  font-size: 13.5px;
  color: var(--app-ink-muted);
}
.cc-send {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--app-action);
  color: var(--app-action-text);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.cc-send svg {
  width: 15px;
  height: 15px;
}

@media (max-width: 560px) {
  .chat-head {
    flex-wrap: wrap;
    gap: 10px;
  }
  .chat-thread {
    padding: 16px;
  }
}

/* @mentions — humans calling humans, and the agent calling a human in.
   Mention blue, the one functional color in the thread. */
.mention {
  font-weight: 600;
  color: #2563eb;
  background: rgba(37, 99, 235, 0.1);
  border-radius: 6px;
  padding: 1px 5px;
}