:root {
  --bg0: #1a1410;
  --bg1: #2a211c;
  --ink: #f3ebe3;
  --muted: #b9a89a;
  --accent: #d9773a;
  --line: rgba(243, 235, 227, 0.12);
  --ok: #7dba7a;
  --bad: #e07a7a;
  --font: "Segoe UI", "Avenir Next", "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, #4a2f22 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #2d3a2f 0%, transparent 50%),
    linear-gradient(160deg, var(--bg0), #120e0c 70%);
}

.shell { min-height: 100vh; }
.brand {
  margin: 0;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: var(--accent);
}
.lede, .meta { color: var(--muted); margin: 0.35rem 0 0; }
.stack { display: grid; gap: 0.9rem; }
label { display: grid; gap: 0.35rem; font-size: 0.92rem; color: var(--muted); }
input, textarea, button {
  font: inherit;
  border-radius: 0.55rem;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.25);
  color: var(--ink);
  padding: 0.75rem 0.9rem;
}
button {
  background: linear-gradient(180deg, #e0894a, var(--accent));
  border: none;
  color: #1a120c;
  font-weight: 650;
  cursor: pointer;
}
button.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}
.error {
  background: rgba(224, 122, 122, 0.15);
  border: 1px solid rgba(224, 122, 122, 0.4);
  padding: 0.7rem 0.85rem;
  border-radius: 0.5rem;
}

.login-shell {
  display: grid;
  place-items: center;
  padding: 2rem 1rem;
}
.login-panel {
  width: min(420px, 100%);
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: color-mix(in srgb, var(--bg1) 88%, transparent);
  backdrop-filter: blur(10px);
}
.login-panel h1 { margin: 0.6rem 0 0; font-size: 1.8rem; font-weight: 650; }

.chat-shell {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100vh;
  max-width: 920px;
  margin: 0 auto;
  padding: 1rem;
  gap: 0.75rem;
}
.topbar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: 0.4rem 0.2rem;
}
.topbar-actions { display: flex; gap: 0.6rem; align-items: center; }
.status {
  font-size: 0.82rem;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  border: 1px solid var(--line);
}
.status.ok { color: var(--ok); }
.status.bad { color: var(--bad); }

.messages {
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(0,0,0,0.18);
}
.bubble {
  max-width: min(85%, 640px);
  padding: 0.8rem 1rem;
  border-radius: 0.9rem;
  white-space: pre-wrap;
  line-height: 1.45;
}
.bubble.user {
  align-self: flex-end;
  background: color-mix(in srgb, var(--accent) 28%, transparent);
}
.bubble.assistant {
  align-self: flex-start;
  background: rgba(255,255,255,0.06);
}
.bubble.system { align-self: center; color: var(--muted); font-size: 0.9rem; }

.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.6rem;
  align-items: end;
}
.composer textarea { resize: vertical; min-height: 3.2rem; }

@media (max-width: 640px) {
  .topbar { flex-direction: column; align-items: flex-start; }
  .composer { grid-template-columns: 1fr; }
}