:root {
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6b6b70;
  --line: #d9d9de;
  --bubble: #f1f1f4;
  --accent: #3b5bdb;
  --accent-fg: #ffffff;
  --error: #c92a2a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111114;
    --fg: #ececf0;
    --muted: #9a9aa2;
    --line: #2e2e35;
    --bubble: #1e1e24;
    --accent: #748ffc;
    --accent-fg: #111114;
    --error: #ff8787;
  }
}

* { box-sizing: border-box; }

html, body { height: 100%; margin: 0; }

body {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif;
  padding: env(safe-area-inset-top) 16px env(safe-area-inset-bottom);
}

header { padding: 12px 0; border-bottom: 1px solid var(--line); }
h1 { margin: 0; font-size: 1.1rem; }

main { flex: 1; min-height: 0; display: flex; flex-direction: column; }
main[hidden] { display: none; }

#log { flex: 1; overflow-y: auto; padding: 12px 0; }

.msg { display: flex; gap: 12px; margin-bottom: 12px; }
.who { flex: 0 0 3.5rem; color: var(--muted); font-size: 0.9rem; }
.body { flex: 1; min-width: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.msg.pending .body { color: var(--muted); }

.buttons { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }

button {
  font: inherit;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bubble);
  color: var(--fg);
}
button:disabled { opacity: 0.5; }
#send, #login-button { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
#login-button { align-self: center; margin-top: 30vh; }

#composer { padding: 8px 0 12px; border-top: 1px solid var(--line); }
#field {
  display: block;
  width: 100%;
  max-height: calc(8 * 1.4em + 20px);
  padding: 10px;
  font: inherit;
  color: inherit;
  background: var(--bubble);
  border: 1px solid var(--line);
  border-radius: 10px;
  resize: none;
}
.actions { display: flex; justify-content: space-between; margin-top: 8px; }

a { color: var(--accent); }

#status { min-height: 1.4em; margin: 0 0 8px; color: var(--error); }