/* =========================================================================
   Nexus · chat.css — message stream, bubbles, typing indicator, empty state.
   ========================================================================= */

#nx-chat {
  position: relative;
  height: 100%;
  overflow-y: auto;
  padding: 28px clamp(20px, 4vw, 56px) 24px;
  scroll-behavior: smooth;
}

/* Center column max width for legibility */
#nx-chat > .nx-chat-stream,
#nx-chat .messages-inner {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* Message bubble — works whether wrapped in #nx-chat or legacy #messages */
.nx-msg, .messages .msg {
  position: relative;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  animation: nxFadeIn var(--nx-dur-slow) var(--nx-ease) both;
}
.nx-msg.user, .messages .msg.user { flex-direction: row-reverse; }

.nx-avatar, .messages .msg .avatar {
  width: 32px; height: 32px;
  flex: 0 0 32px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-family: var(--nx-font-mono);
  font-size: 12px;
  font-weight: 600;
  background: var(--nx-surface-2);
  border: 1px solid var(--nx-line);
  color: var(--nx-accent);
  box-shadow: var(--nx-shadow-inset);
}
.nx-msg.user .nx-avatar,
.messages .msg.user .avatar {
  background: var(--nx-accent);
  color: var(--nx-bg);
  border-color: transparent;
  box-shadow: 0 0 14px var(--nx-glow);
}

.nx-bubble, .messages .msg .bubble {
  background: var(--nx-surface);
  border: 1px solid var(--nx-line);
  border-radius: var(--nx-radius-lg);
  padding: 12px 16px;
  max-width: 78%;
  box-shadow: var(--nx-shadow-soft), var(--nx-shadow-inset);
  position: relative;
}
.nx-msg.user .nx-bubble,
.messages .msg.user .bubble {
  background: linear-gradient(180deg, var(--nx-accent) 0%, var(--nx-accent-2) 100%);
  color: var(--nx-bg);
  border-color: transparent;
}
.nx-bubble pre, .messages .msg .bubble pre {
  background: var(--nx-bg);
  border: 1px solid var(--nx-line);
  border-radius: var(--nx-radius);
  padding: 10px 12px;
  overflow-x: auto;
  font-size: 13px;
}

/* Sub-meta line under each msg */
.nx-msg-meta {
  font-family: var(--nx-font-pixel);
  font-size: 14px;
  color: var(--nx-muted);
  letter-spacing: .04em;
  margin-top: 4px;
}

/* Typing indicator */
#nx-typing, .typing {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  margin: 4px auto 0;
  background: var(--nx-surface);
  border: 1px solid var(--nx-line);
  border-radius: var(--nx-radius-xl);
  color: var(--nx-text-2);
  font-size: 13px;
  font-style: italic;
  box-shadow: var(--nx-shadow-inset);
  width: max-content;
}
#nx-typing span, .typing span {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--nx-accent);
  display: inline-block;
  opacity: .35;
  animation: nxTypingPulse 1.2s var(--nx-ease) infinite;
}
#nx-typing span:nth-child(2), .typing span:nth-child(2) { animation-delay: .15s; }
#nx-typing span:nth-child(3), .typing span:nth-child(3) { animation-delay: .3s; }

@keyframes nxTypingPulse {
  0%, 60%, 100% { opacity: .25; transform: scale(.85); }
  30% { opacity: 1; transform: scale(1); box-shadow: 0 0 8px var(--nx-glow); }
}

@keyframes nxFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Empty state — huge ghosted wordmark + 4 starter cards in tilted grid */
.nx-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
  z-index: 0;
}
.nx-empty-wordmark {
  position: absolute;
  font-family: var(--nx-font-display);
  font-weight: 700;
  font-size: clamp(120px, 24vw, 260px);
  letter-spacing: -.04em;
  color: transparent;
  -webkit-text-stroke: 1px var(--nx-line);
  opacity: .55;
  user-select: none;
  line-height: 1;
}

.nx-starter-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, 220px);
  grid-template-rows: repeat(2, auto);
  gap: 14px;
  pointer-events: auto;
  transform: rotate(-2deg);
  z-index: 1;
}
.nx-starter-card {
  background: var(--nx-surface);
  border: 1px solid var(--nx-line);
  border-radius: var(--nx-radius);
  padding: 14px 14px 12px;
  box-shadow: var(--nx-shadow-soft), var(--nx-shadow-inset);
  transition: transform var(--nx-dur-base) var(--nx-ease),
              border-color var(--nx-dur-base) var(--nx-ease),
              box-shadow var(--nx-dur-base) var(--nx-ease);
  cursor: pointer;
  text-align: left;
  width: 100%;
}
.nx-starter-card:nth-child(1) { transform: rotate(2deg); }
.nx-starter-card:nth-child(2) { transform: rotate(-1.5deg); }
.nx-starter-card:nth-child(3) { transform: rotate(-2deg); }
.nx-starter-card:nth-child(4) { transform: rotate(1.5deg); }
.nx-starter-card:hover {
  transform: translateY(-3px) rotate(0deg) !important;
  border-color: var(--nx-accent);
  box-shadow: var(--nx-shadow-soft), 0 0 0 1px var(--nx-accent-soft), 0 0 28px var(--nx-glow);
}
.nx-starter-icon {
  width: 18px; height: 18px;
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--nx-font-arcade);
  font-size: 9px;
  color: var(--nx-accent);
  letter-spacing: 0;
}
.nx-starter-title {
  font-family: var(--nx-font-display);
  font-weight: 600;
  font-size: 14px;
  color: var(--nx-text);
  margin-bottom: 2px;
}
.nx-starter-desc {
  font-size: 12px;
  color: var(--nx-text-2);
  line-height: 1.4;
}

@media (max-width: 760px) {
  .nx-starter-grid { grid-template-columns: 1fr; }
}