:root {
  color-scheme: dark;
  --bg: #070b14;
  --panel: #0e1626;
  --panel-2: #131f33;
  --text: #e8eefc;
  --muted: #93a4c3;
  --accent: #6ee7b7;
  --accent-2: #38bdf8;
  --danger: #fb7185;
  --border: rgba(148, 163, 184, 0.18);
  --radius: 18px;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background:
    radial-gradient(1200px 700px at 10% -10%, rgba(56, 189, 248, 0.14), transparent 55%),
    radial-gradient(900px 600px at 100% 0%, rgba(110, 231, 183, 0.10), transparent 50%),
    var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.app {
  min-height: 100dvh;
  max-width: 860px;
  margin: 0 auto;
  display: grid;
  grid-template-rows: auto 1fr auto auto;
  padding: max(14px, env(safe-area-inset-top)) 14px max(14px, env(safe-area-inset-bottom));
  gap: 12px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.eyebrow {
  margin: 0 0 2px;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(1.35rem, 4vw, 1.8rem);
  letter-spacing: -0.03em;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.status {
  font-size: 0.72rem;
  color: var(--muted);
  border: 1px solid var(--border);
  background: rgba(14, 22, 38, 0.8);
  padding: 6px 9px;
  border-radius: 999px;
  white-space: nowrap;
}
.status[data-state="online"] { color: var(--accent); border-color: rgba(110, 231, 183, 0.35); }
.status[data-state="working"] { color: var(--accent-2); border-color: rgba(56, 189, 248, 0.35); }
.status[data-state="error"] { color: var(--danger); border-color: rgba(251, 113, 133, 0.35); }

.chat {
  overflow-y: auto;
  padding: 8px 2px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scroll-behavior: smooth;
}

.bubble {
  max-width: min(78ch, 92%);
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(14, 22, 38, 0.9);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
  animation: pop 160ms ease-out;
}
.bubble p { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.55; }
.bubble-user {
  align-self: flex-end;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.22), rgba(110, 231, 183, 0.14));
  border-color: rgba(56, 189, 248, 0.28);
}
.bubble-bot { align-self: flex-start; }
.bubble-error { border-color: rgba(251, 113, 133, 0.4); background: rgba(251, 113, 133, 0.08); }
.bubble-meta { margin-top: 6px; color: var(--muted); font-size: 0.68rem; }

.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  align-items: end;
  background: rgba(14, 22, 38, 0.92);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 8px;
  backdrop-filter: blur(12px);
}

textarea {
  width: 100%;
  resize: none;
  min-height: 44px;
  max-height: 160px;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  padding: 10px 10px;
  line-height: 1.4;
}

button {
  font: inherit;
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: 14px;
  padding: 10px 14px;
  color: #04111d;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  font-weight: 800;
}
button:disabled { opacity: 0.55; cursor: wait; }
.icon-button {
  background: transparent;
  color: var(--muted);
  border-color: var(--border);
  font-weight: 600;
  padding: 7px 10px;
  border-radius: 999px;
}
.secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
  font-weight: 700;
}

.settings {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(14, 22, 38, 0.72);
  padding: 10px 12px;
  color: var(--muted);
  font-size: 0.85rem;
}
.settings summary { cursor: pointer; color: var(--text); font-weight: 700; }
.settings label { display: block; margin: 10px 0 6px; color: var(--muted); }
.settings input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(7, 11, 20, 0.7);
  color: var(--text);
  padding: 10px 12px;
  font: inherit;
}
.settings-row { display: flex; align-items: center; gap: 10px; margin-top: 10px; flex-wrap: wrap; }
.hint { margin: 8px 0 0; line-height: 1.45; }
.mode { font-size: 0.78rem; color: var(--muted); }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

@keyframes pop {
  from { opacity: 0; transform: translateY(6px) scale(0.99); }
  to { opacity: 1; transform: none; }
}

@media (min-width: 720px) {
  .app { padding-left: 24px; padding-right: 24px; }
  .bubble { max-width: 72%; }
}