:root {
  --ttai-bg: #04060a;
  --ttai-card: #0f1522;
  --ttai-border: rgba(255, 255, 255, 0.08);
  --ttai-text: #e7ebff;
  --ttai-muted: #8b93a7;
  --ttai-accent: #5ee1ff;
  --ttai-gradient: linear-gradient(135deg, #4f46ff, #14b8ff);
}

.ttai-chat {
  max-width: 960px;
  margin: 3rem auto;
  padding: 0 1.5rem;
  color: var(--ttai-text);
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

.ttai-chat__header {
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.ttai-chat__eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--ttai-muted);
  font-size: 0.75rem;
  margin-bottom: 0.25rem;
}

.ttai-chat__subtitle {
  color: var(--ttai-muted);
  margin: 0.35rem 0 0;
  max-width: 520px;
}

.ttai-chat__status {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--ttai-border);
  font-size: 0.85rem;
  background: rgba(20, 184, 255, 0.08);
}

.ttai-chat__status .dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  display: inline-block;
  background: #facc15;
}

.ttai-chat__status[data-status="ok"] .dot {
  background: #22c55e;
}

.ttai-chat__status[data-status="down"] .dot {
  background: #f43f5e;
}

.ttai-chat__card {
  background: var(--ttai-card);
  border-radius: 28px;
  border: 1px solid var(--ttai-border);
  padding: 1.5rem;
  box-shadow: 0 20px 60px rgba(7, 13, 31, 0.65);
}

.ttai-chat__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--ttai-border);
}

.ttai-chat__meta .label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ttai-muted);
  margin-bottom: 0.5rem;
}

.ttai-chat__backends {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.ttai-chat__backends li {
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--ttai-border);
  display: flex;
  gap: 0.4rem;
  align-items: center;
  font-size: 0.8rem;
}

.ttai-chat__backends .dot {
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
}

.ttai-chat__backends .dot.ok {
  background: #22c55e;
}

.ttai-chat__backends .dot.down {
  background: #f97316;
}

.ttai-chat__trail {
  border: 1px dashed var(--ttai-border);
  border-radius: 14px;
  padding: 0.75rem;
  min-height: 56px;
}

.ttai-chat__trail .trail {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--ttai-muted);
}

.ttai-chat__conversation {
  margin: 1.5rem 0;
  max-height: 420px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.ttai-chat__empty {
  text-align: center;
  padding: 2rem 0;
  color: var(--ttai-muted);
}

.ttai-chat__empty span {
  font-size: 2rem;
  display: block;
  margin-bottom: 0.75rem;
}

.ttai-chat__message {
  display: flex;
}

.ttai-chat__message .bubble {
  padding: 0.85rem 1rem;
  border-radius: 18px;
  max-width: 80%;
  line-height: 1.45;
}

.ttai-chat__message--user {
  justify-content: flex-end;
}

.ttai-chat__message--user .bubble {
  background: var(--ttai-gradient);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.ttai-chat__message--assistant .bubble {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--ttai-border);
  border-bottom-left-radius: 4px;
}

.ttai-chat__composer {
  display: flex;
  gap: 1rem;
  border: 1px solid var(--ttai-border);
  border-radius: 18px;
  padding: 0.75rem 1rem;
  align-items: center;
  background: rgba(4, 6, 10, 0.65);
}

.ttai-chat__composer textarea {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--ttai-text);
  resize: none;
  font-size: 1rem;
  line-height: 1.4;
}

.ttai-chat__composer textarea:focus {
  outline: none;
}

.ttai-chat__composer button {
  border: none;
  border-radius: 999px;
  padding: 0.55rem 1.4rem;
  font-weight: 600;
  background: var(--ttai-gradient);
  color: #fff;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.ttai-chat__composer button:hover {
  transform: translateY(-1px);
}

.ttai-chat__composer.loading button {
  opacity: 0.6;
  pointer-events: none;
}

@media (max-width: 640px) {
  .ttai-chat__card {
    padding: 1.1rem;
    border-radius: 18px;
  }
  .ttai-chat__message .bubble {
    max-width: 100%;
  }
}