:root {
  --bg: #f4f3ef; --card: #ffffff; --ink: #1c1c1a; --muted: #6b6a64; --line: #e2e0d8;
  --accent: #2d5b78; --accent-ink: #ffffff; --bot: #eeede7;
  --ok: #1f7a4a; --ok-bg: #e3f3ea; --bad: #a33a2c; --bad-bg: #f8e5e1; --info: #2d5b78; --info-bg: #e3edf4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141513; --card: #1d1e1b; --ink: #ebeae4; --muted: #9d9c95; --line: #30312d;
    --accent: #7fb2d6; --accent-ink: #0d1820; --bot: #272824;
    --ok: #7fd3a4; --ok-bg: #173225; --bad: #f0a093; --bad-bg: #3a1d18; --info: #9ec8e6; --info-bg: #182a36;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 24px 16px 48px; display: grid; gap: 16px; }
header { padding: 4px 0 8px; }
.team { margin: 0; font-size: 13px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--accent); }
h1 { margin: 2px 0 0; font-size: 26px; letter-spacing: -0.01em; }
.sub { margin: 4px 0 0; color: var(--muted); }
h2 { margin: 0 0 12px; font-size: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px; }
.log { height: 380px; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; padding: 4px 2px 12px; }
.empty { margin: auto; color: var(--muted); }
.msg { max-width: 85%; padding: 9px 13px; border-radius: 14px; white-space: pre-wrap; overflow-wrap: anywhere; }
.user { align-self: flex-end; background: var(--accent); color: var(--accent-ink); border-bottom-right-radius: 4px; }
.bot { align-self: flex-start; background: var(--bot); border-bottom-left-radius: 4px; }
.bot.wait { color: var(--muted); font-style: italic; }
.row { display: flex; gap: 8px; }
textarea, input {
  flex: 1; min-width: 0; font: inherit; color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; resize: vertical;
}
textarea:focus, input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
button {
  font: inherit; font-weight: 600; border: 0; border-radius: 10px; padding: 0 18px; min-height: 44px;
  background: var(--accent); color: var(--accent-ink); cursor: pointer; white-space: nowrap;
}
button:disabled { opacity: .55; cursor: default; }
.count { margin: 4px 0 0; font-size: 12px; color: var(--muted); text-align: right; }
.result { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 12px; min-height: 30px; }
.badge { font-weight: 700; padding: 4px 12px; border-radius: 999px; }
.badge.Correct { color: var(--ok); background: var(--ok-bg); }
.badge.Incorrect { color: var(--bad); background: var(--bad-bg); }
.badge.Hello, .badge.Error { color: var(--info); background: var(--info-bg); }
.json { font: 13px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: var(--muted); overflow-wrap: anywhere; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
@media (max-width: 480px) {
  .row { flex-direction: column; }
  button { width: 100%; }
  .log { height: 320px; }
}