:root {
  --bg: #f5efe4;
  --card: #fffdf9;
  --ink: #172b3a;
  --muted: #5b6d78;
  --line: #d9c9b3;
  --brand: #0d4a6e;
  --accent: #cf672f;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "Trebuchet MS", sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #f3ebdf 0%, #f8f3e9 100%);
}

.container { width: min(980px, 94vw); margin: 0 auto; }
.top { border-bottom: 1px solid var(--line); background: rgba(255,251,243,.9); }
.top-inner { display: flex; justify-content: space-between; align-items: center; padding: .8rem 0; }
.brand { font-size: 1.2rem; font-weight: 800; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1rem;
  margin-top: 1rem;
}

.auth-card { max-width: 520px; margin: 1.4rem auto; }
.form { display: grid; gap: .8rem; }
label { display: grid; gap: .3rem; font-weight: 600; }
input {
  border: 1px solid #c6b59e;
  border-radius: 10px;
  padding: .62rem .7rem;
  font: inherit;
}

.btn {
  border: 0;
  border-radius: 10px;
  padding: .62rem .92rem;
  cursor: pointer;
  font-weight: 700;
}
.btn-primary { background: linear-gradient(100deg, var(--brand), #22688f); color: #fff; }
.btn-light { border: 1px solid var(--line); background: #fff; }
.error { color: #b42318; font-weight: 600; }
.hint { color: var(--muted); }

.chat-head p { color: var(--muted); margin: .2rem 0 0; }
.chat { display: grid; gap: .9rem; }
.messages {
  height: 58vh;
  overflow: auto;
  border: 1px solid #e3d8c9;
  border-radius: 12px;
  padding: .8rem;
  background: #fff;
}

.msg {
  margin-bottom: .65rem;
  padding: .58rem .62rem;
  border: 1px solid #e8ddce;
  border-radius: 10px;
  background: #fffdf9;
}

.msg .meta { color: var(--muted); font-size: .82rem; margin-bottom: .2rem; }
.composer { display: grid; grid-template-columns: 1fr auto; gap: .6rem; }

@media (max-width: 680px) {
  .composer { grid-template-columns: 1fr; }
  .messages { height: 52vh; }
}