:root {
  --bg: #0b1020;
  --panel: #121a2f;
  --panel-2: #18223d;
  --border: rgba(255,255,255,0.08);
  --text: #eef2ff;
  --muted: #9ba6c7;
  --accent: #7c9cff;
  --accent-2: #5eead4;
  --danger: #f87171;
  --user: #24335d;
  --assistant: #16213b;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #162344 0%, var(--bg) 45%);
  color: var(--text);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 340px 1fr;
}

.sidebar {
  padding: 24px;
  border-right: 1px solid var(--border);
  background: rgba(7, 12, 24, 0.55);
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.chat-panel {
  display: grid;
  grid-template-rows: 1fr auto;
  min-height: 100vh;
}

.messages {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow-y: auto;
}

.message {
  max-width: 860px;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid var(--border);
  line-height: 1.55;
  white-space: pre-wrap;
}

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

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

.message.system {
  align-self: center;
  background: rgba(255,255,255,0.04);
  color: var(--muted);
}

.composer {
  padding: 18px 22px 24px;
  border-top: 1px solid var(--border);
  background: rgba(10, 16, 30, 0.88);
}

.composer textarea,
textarea,
input {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 12px;
  padding: 12px 14px;
  resize: vertical;
  outline: none;
}

textarea:focus,
input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(124, 156, 255, 0.15);
}

label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 8px;
}

button {
  border: 0;
  background: linear-gradient(135deg, var(--accent), #91a7ff);
  color: white;
  border-radius: 12px;
  padding: 12px 16px;
  font-weight: 600;
  cursor: pointer;
}

button.secondary {
  background: rgba(255,255,255,0.08);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 16px;
}

.stack { display: grid; gap: 14px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.eyebrow { color: var(--accent-2); font-size: 12px; text-transform: uppercase; letter-spacing: 0.12em; }
h1 { margin: 6px 0 10px; font-size: 28px; }
.muted { color: var(--muted); line-height: 1.5; }
.value { font-weight: 600; word-break: break-all; }
.composer-actions { margin-top: 10px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.hint { color: var(--muted); font-size: 13px; }
.status-pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
}
.status-pill.ok { background: rgba(94, 234, 212, 0.15); color: var(--accent-2); }
.status-pill.error { background: rgba(248, 113, 113, 0.12); color: var(--danger); }
.status-pill.loading { background: rgba(255,255,255,0.08); color: var(--muted); }

@media (max-width: 900px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { border-right: 0; border-bottom: 1px solid var(--border); }
  .chat-panel { min-height: auto; }
}