:root {
  color-scheme: light;
  --bg: #f7f7f8;
  --shell: #ffffff;
  --soft: #f2f4f7;
  --soft-2: #eef1f5;
  --border: #d9dce2;
  --text: #1f2430;
  --muted: #6a7280;
  --accent: #4f46e5;
  --accent-2: #6d5efc;
  --accent-soft: rgba(79, 70, 229, 0.12);
  --assistant: #f4f5f7;
  --user: #e9f3ff;
  --danger: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

button,
select,
textarea {
  font: inherit;
}

.app-layout {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 18px;
  padding: 18px;
}

.sidebar,
.chat-panel {
  background: var(--shell);
  border: 1px solid var(--border);
  border-radius: 26px;
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.06);
}

.sidebar {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.brand-block h1 {
  margin: 6px 0 0;
  font-size: 1.8rem;
}

.brand-kicker,
.eyebrow,
.label {
  text-transform: uppercase;
  letter-spacing: 0.11em;
  font-size: 11px;
  color: var(--accent);
  font-weight: 700;
}

.control-card {
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--soft);
  padding: 14px;
}

.select-input,
textarea {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  padding: 12px 14px;
}

.select-input {
  margin-top: 10px;
}

.connector-grid,
.mode-picker,
.quick-actions {
  margin-top: 10px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.connector,
.mode,
.quick-btn,
.composer button {
  border: none;
  border-radius: 999px;
  padding: 10px 14px;
  background: var(--soft-2);
  color: var(--text);
  cursor: pointer;
  transition: 0.2s ease;
}

.connector.active,
.mode.active,
.composer button {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  font-weight: 700;
}

.quick-btn.danger {
  background: rgba(180, 35, 24, 0.08);
  color: var(--danger);
}

button:hover {
  transform: translateY(-1px);
  filter: saturate(1.05);
}

.chat-panel {
  padding: 18px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 16px;
}

.chat-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.chat-header h2 {
  margin: 4px 0 0;
  font-size: 1.8rem;
}

.status-pill {
  border-radius: 999px;
  background: var(--accent-soft);
  border: 1px solid rgba(79, 70, 229, 0.2);
  color: var(--accent);
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.chat-area {
  min-height: 420px;
  max-height: calc(100vh - 230px);
  overflow-y: auto;
  padding: 14px;
  border-radius: 18px;
  background: #fbfbfc;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-message {
  padding: 12px 14px;
  border-radius: 16px;
  max-width: 82%;
  line-height: 1.55;
  white-space: pre-wrap;
  border: 1px solid rgba(15, 23, 42, 0.05);
}

.chat-message.user {
  align-self: flex-end;
  background: var(--user);
}

.chat-message.assistant {
  align-self: flex-start;
  background: var(--assistant);
}

.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: end;
}

textarea {
  resize: vertical;
  min-height: 96px;
}

@media (max-width: 900px) {
  .app-layout {
    grid-template-columns: 1fr;
  }

  .chat-area {
    max-height: 55vh;
  }
}

@media (max-width: 700px) {
  .composer {
    grid-template-columns: 1fr;
  }

  .chat-header {
    flex-direction: column;
    align-items: flex-start;
  }
}