:root {
  color-scheme: light;
  font-family: Inter, Pretendard, "Noto Sans KR", Arial, sans-serif;
  color: #172229;
  background: #eef4f3;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; min-height: 100vh; }
button, input { font: inherit; letter-spacing: 0; }
button { cursor: pointer; }
.shell { width: min(1040px, calc(100% - 32px)); margin: 24px auto; background: #fff; border: 1px solid #cedcda; min-height: calc(100vh - 48px); }
.topbar { min-height: 86px; padding: 20px 28px; border-bottom: 1px solid #d8e2e0; display: flex; align-items: center; justify-content: space-between; }
.eyebrow { margin: 0 0 4px; color: #087866; font-size: 12px; font-weight: 800; }
h1, h2 { margin: 0; letter-spacing: 0; }
h1 { font-size: 24px; }
h2 { font-size: 22px; }
.quiet { border: 1px solid #b9cbc8; background: #f8fbfa; padding: 9px 13px; }
.login-panel { padding: 56px 28px; display: grid; grid-template-columns: 1fr minmax(280px, 380px); gap: 56px; align-items: start; }
.login-panel p { color: #5f7174; }
label { display: grid; gap: 7px; margin-bottom: 14px; font-weight: 700; }
input { width: 100%; height: 48px; border: 1px solid #afc2bf; padding: 0 14px; background: #fff; }
input:focus { outline: 3px solid #bfe8df; border-color: #087866; }
form button { min-height: 46px; border: 0; background: #087866; color: #fff; padding: 0 20px; font-weight: 800; }
.status { min-height: 24px; color: #a33a32 !important; }
.chat-panel { min-height: calc(100vh - 136px); display: grid; grid-template-rows: 1fr auto auto; }
.messages { padding: 28px; display: flex; flex-direction: column; gap: 14px; overflow-y: auto; }
.message { max-width: 78%; padding: 15px 17px; border: 1px solid #cddad8; white-space: pre-wrap; line-height: 1.6; }
.message.user { align-self: flex-end; background: #e6f3f0; border-color: #a9d2ca; }
.message.assistant { align-self: flex-start; background: #fff; }
.composer { border-top: 1px solid #d8e2e0; padding: 16px 20px; display: grid; grid-template-columns: 1fr auto; gap: 10px; }
.notice { margin: 0; padding: 0 20px 16px; color: #607174; font-size: 13px; }
.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; }

@media (max-width: 720px) {
  .shell { width: 100%; margin: 0; min-height: 100vh; border: 0; }
  .login-panel { grid-template-columns: 1fr; gap: 28px; padding: 38px 22px; }
  .message { max-width: 92%; }
  .topbar { padding: 18px 20px; }
}