/* ==========================================================================
   UltraLink — chat page styles
   Loaded only on chat.html, layered on top of style.css. Additive only.
   ========================================================================== */

/* Conversation log — the centerpiece of the chat page */
.chat-log {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  min-height: 280px;
  max-height: 420px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.chat-log:empty::before {
  content: "No messages yet. The link is one-way at a time — hold Transmit to send.";
  color: var(--text-3);
  font-size: 13px;
  font-style: italic;
  margin: auto;
  text-align: center;
  max-width: 40ch;
  line-height: 1.5;
}

/* A single message row */
.msg {
  display: flex;
  flex-direction: column;
  max-width: 78%;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.45;
}
.msg .bubble {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 9px 12px;
  color: var(--text);
  word-break: break-word;
  white-space: pre-wrap;
}
.msg .meta {
  font-family: var(--font-sans);
  font-size: 10px;
  color: var(--text-3);
  margin-top: 4px;
  padding: 0 4px;
  letter-spacing: 0.04em;
}

/* Outgoing: right side, accent border */
.msg.out { align-self: flex-end; align-items: flex-end; }
.msg.out .bubble {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
  border-bottom-right-radius: 2px;
}

/* Incoming: left side */
.msg.in { align-self: flex-start; }
.msg.in .bubble { border-bottom-left-radius: 2px; }

/* Status messages (system notices inline in the log) */
.msg.system { align-self: center; max-width: 90%; }
.msg.system .bubble {
  background: transparent;
  border: none;
  color: var(--text-3);
  font-family: var(--font-sans);
  font-size: 11px;
  font-style: italic;
  padding: 2px 8px;
}
.msg.system .meta { display: none; }

/* Push-to-transmit button — big, full width, stateful */
.ptt {
  width: 100%;
  padding: 16px 20px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: var(--radius);
  border: 1px solid var(--text);
  background: var(--text);
  color: var(--bg);
  cursor: pointer;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
  text-transform: uppercase;
  user-select: none;
}
.ptt:hover:not(:disabled) { background: #333; border-color: #333; }
.ptt:active:not(:disabled) { transform: translateY(1px); }
.ptt.transmitting {
  background: var(--bg-elev);
  color: var(--text);
  border-color: var(--text);
}
.ptt:disabled { opacity: 0.4; cursor: not-allowed; }

/* The big link status banner above the log */
.chat-status {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 12px;
  color: var(--text-2);
  margin-bottom: 12px;
}
.chat-status .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--text-3);
  flex-shrink: 0;
}
.chat-status.listening .dot { background: var(--ok); }
.chat-status.transmitting .dot { background: var(--err); animation: pulse 1s ease-in-out infinite; }
.chat-status.offline .dot { background: var(--text-3); }
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

/* Compose row */
.compose {
  display: flex;
  gap: 8px;
  align-items: stretch;
  margin-top: 10px;
}
.compose input[type=text] { flex: 1; }

/* Collapsible diagnostics (waterfall + pipeline) — hidden by default on chat */
.chat-diagnostics {
  margin-top: 24px;
}
.chat-diagnostics summary {
  cursor: pointer;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
  outline: none;
}
.chat-diagnostics summary:hover { color: var(--text-2); }
.chat-diagnostics[open] summary { margin-bottom: 14px; }
.chat-diagnostics .diag-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 768px) {
  .chat-diagnostics .diag-grid { grid-template-columns: 1fr; }
}

/* Hide the engine's raw received-message box on chat — we use the log instead */
.chat-hide { display: none !important; }