.chat-shell {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 100px);
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 24px;
}

.chat-feed {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0 24px;
}

.chat-welcome {
  max-width: 760px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  text-align: center;
}

.chat-welcome h1 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 0;
}

.chat-welcome p {
  color: var(--ink-soft);
  max-width: 480px;
  margin: 0;
}

.quick-prompt-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  width: 100%;
}

.quick-prompt-card {
  text-align: left;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease;
  font-family: var(--font-body);
  color: var(--ink);
}

.quick-prompt-card:hover {
  border-color: var(--lime);
  transform: translate(-2px, -2px);
}

.quick-prompt-card strong {
  display: block;
  font-family: var(--font-display);
  font-size: 0.95rem;
  margin-bottom: 6px;
  color: var(--lime);
}

.quick-prompt-card span {
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.chat-messages {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.msg-row {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.msg-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  border: 2px solid var(--border);
}

.msg-row.ai .msg-avatar {
  background: rgba(200, 255, 77, 0.12);
  border-color: rgba(200, 255, 77, 0.4);
}

.msg-row.user .msg-avatar {
  background: rgba(77, 216, 255, 0.12);
  border-color: rgba(77, 216, 255, 0.4);
}

.msg-bubble {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  font-size: 0.94rem;
  line-height: 1.6;
  max-width: calc(100% - 60px);
  white-space: pre-wrap;
}

.msg-row.ai .msg-bubble {
  border-color: rgba(200, 255, 77, 0.3);
}

.engine-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--lime);
  margin-bottom: 6px;
}

.msg-actions {
  margin-top: 10px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.msg-action-btn {
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--ink-soft);
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 0.74rem;
  cursor: pointer;
}

.msg-action-btn:hover {
  border-color: var(--lime);
  color: var(--lime);
}

.typing-dots {
  display: inline-flex;
  gap: 5px;
  padding: 4px 0;
}

.typing-dots span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime);
  opacity: 0.5;
  animation: chat-blink 1.2s infinite ease-in-out;
}

.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes chat-blink {
  0%, 100% { opacity: 0.25; }
  50% { opacity: 1; }
}

.chat-composer {
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  padding-top: 12px;
  border-top: 1px solid var(--border-soft);
}

.model-badge {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--lime);
  background: rgba(200, 255, 77, 0.1);
  border: 1px solid rgba(200, 255, 77, 0.25);
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 10px;
}

.composer-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.attach-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--surface-2);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.4rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
}

.attach-btn:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.composer-row input {
  flex: 1;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 999px;
  padding: 14px 20px;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 0.95rem;
}

.composer-row input:focus {
  outline: none;
  border-color: var(--lime);
}

.composer-row input::placeholder {
  color: var(--ink-faint);
}

.send-btn {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--lime);
  color: var(--bg-deep);
  border: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.send-btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow);
}

.send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.attachment-tray {
  display: none;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.attachment-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--ink-soft);
  border-radius: 999px;
  padding: 6px 10px;
  max-width: 100%;
}

.attachment-chip-label {
  font-size: 0.72rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 340px;
}

.attachment-chip-remove {
  border: none;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 0.95rem;
  line-height: 1;
}

.attachment-chip-remove:hover {
  color: var(--coral);
}

.composer-note {
  text-align: center;
  font-size: 0.76rem;
  color: var(--ink-faint);
  margin: 10px 0 0;
}

@media (max-width: 640px) {
  .quick-prompt-grid {
    grid-template-columns: 1fr;
  }

  .chat-shell {
    padding: 0 16px 16px;
  }

  .attachment-chip-label {
    max-width: 220px;
  }
}