:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #172033;
  --muted: #5e6a7d;
  --line: #dce2ec;
  --accent: #174a8b;
  --accent-2: #0d6b5f;
  --warn: #8a5a00;
  --bad: #9b1c1c;
  --ok-bg: #e8f5ef;
  --warn-bg: #fff3d7;
  --bad-bg: #fde8e8;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; background: var(--bg); color: var(--text); }
.page-shell { max-width: 1040px; margin: 0 auto; padding: 24px; }
.hero, .chat-card, .admin-panel { background: var(--card); border: 1px solid var(--line); border-radius: 18px; box-shadow: 0 8px 28px rgba(23, 32, 51, 0.08); }
.hero { padding: 28px; margin-bottom: 18px; display: flex; justify-content: space-between; gap: 18px; align-items: flex-start; }
.eyebrow { margin: 0 0 8px; color: var(--accent); font-weight: 700; letter-spacing: .03em; text-transform: uppercase; font-size: .78rem; }
h1 { margin: 0 0 12px; font-size: clamp(1.8rem, 3vw, 2.55rem); line-height: 1.1; }
h2 { margin: 0 0 12px; font-size: 1.2rem; }
.lead { font-size: 1.05rem; max-width: 760px; line-height: 1.55; margin: 0 0 10px; }
.small-note { color: var(--muted); font-size: .92rem; line-height: 1.45; }
.danger-note { color: var(--bad); }
.version-badge { display: inline-block; font-size: .8rem; vertical-align: middle; padding: 4px 9px; border-radius: 999px; color: #fff; background: var(--accent); }
.chat-card { padding: 18px; }
.chat-log { height: 430px; overflow: auto; padding: 8px; border: 1px solid var(--line); border-radius: 14px; background: #fbfcfe; }
.message { max-width: 82%; padding: 11px 13px; margin: 9px 0; border-radius: 14px; line-height: 1.45; white-space: pre-wrap; }
.message.bot { background: #edf3fb; border: 1px solid #d5e4f7; }
.message.user { margin-left: auto; background: #e9f5f2; border: 1px solid #cce7df; }
.chat-form { display: flex; gap: 10px; margin-top: 12px; }
.chat-form input { flex: 1; padding: 12px 13px; border: 1px solid var(--line); border-radius: 12px; font: inherit; }
button, .link-button { border: 0; border-radius: 12px; padding: 11px 14px; background: var(--accent); color: white; font-weight: 700; cursor: pointer; text-decoration: none; display: inline-block; }
button:hover, .link-button:hover { filter: brightness(.95); }
.quick-questions, .button-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.quick-questions button, .button-row button { background: #e9eef7; color: var(--accent); border: 1px solid #d6dfef; font-weight: 650; padding: 8px 10px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.admin-shell { max-width: 1280px; }
.admin-grid { display: grid; grid-template-columns: minmax(320px, 0.9fr) minmax(420px, 1.4fr); gap: 18px; margin-bottom: 18px; }
.admin-panel { padding: 18px; overflow: auto; }
.admin-form { margin-bottom: 12px; }
.diagnostic-box { background: #fbfcfe; border: 1px solid var(--line); border-radius: 14px; padding: 14px; line-height: 1.45; }
.status, .pill { display: inline-block; border-radius: 999px; padding: 4px 8px; font-size: .78rem; font-weight: 800; }
.status.ok, .pill.ok { background: var(--ok-bg); color: var(--accent-2); }
.status.warn, .pill.warn { background: var(--warn-bg); color: var(--warn); }
.status.bad, .pill.bad { background: var(--bad-bg); color: var(--bad); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .9em; color: var(--muted); }
table { width: 100%; border-collapse: collapse; font-size: .88rem; }
th, td { border-bottom: 1px solid var(--line); padding: 8px; vertical-align: top; text-align: left; }
th { background: #f1f4f8; position: sticky; top: 0; }
.test-table { max-height: 520px; overflow: auto; border: 1px solid var(--line); border-radius: 12px; margin-top: 12px; }
.test-summary { margin: 10px 0; }
.kb-list details { border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; margin: 8px 0; background: #fbfcfe; }
.kb-list summary { cursor: pointer; font-weight: 700; }
code { background: #eef2f7; border-radius: 6px; padding: 2px 5px; }
@media (max-width: 780px) {
  .page-shell { padding: 12px; }
  .hero { display: block; padding: 20px; }
  .chat-form { flex-direction: column; }
  .message { max-width: 95%; }
  .admin-grid { grid-template-columns: 1fr; }
}