:root{color-scheme:light;--navy:#17233c;--gold:#d6a84b;--bg:#f4f6f9;--line:#e1e5eb;--text:#1d2635}
*{box-sizing:border-box}html,body{height:100%;margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif;background:var(--bg);color:var(--text)}
.app{height:100%;max-width:720px;margin:auto;background:#fff;display:grid;grid-template-rows:auto 1fr auto auto;box-shadow:0 0 30px #0001}
header{padding:14px 16px;background:var(--navy);color:#fff;display:flex;justify-content:space-between;align-items:center}header strong{display:block;font-size:17px}header small{display:block;color:#b9c4d8;margin-top:3px}header button{border:1px solid #ffffff55;background:#ffffff18;color:#fff;border-radius:18px;padding:7px 12px}
#messages{overflow:auto;padding:16px;scroll-behavior:smooth}.msg{display:flex;margin:9px 0}.msg.me{justify-content:flex-end}.bubble{max-width:82%;padding:10px 12px;border-radius:14px;background:#edf0f5;white-space:pre-wrap;word-break:break-word;box-shadow:0 1px 2px #0000000d}.me .bubble{background:var(--navy);color:#fff;border-bottom-right-radius:4px}.agent .bubble{border-bottom-left-radius:4px}.time{display:block;font-size:10px;opacity:.58;margin-top:5px}
.quick{display:flex;gap:7px;overflow:auto;padding:8px 12px;border-top:1px solid var(--line)}.quick button{white-space:nowrap;border:1px solid #d7b66e;background:#fffaf0;color:#6b4b14;border-radius:16px;padding:7px 11px}
#composer{display:flex;gap:8px;padding:10px 12px calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--line)}textarea{flex:1;resize:none;border:1px solid var(--line);border-radius:12px;padding:11px;font:inherit;max-height:100px}#composer button{border:0;background:var(--gold);color:#241b0a;border-radius:12px;padding:0 17px;font-weight:700}
.system{text-align:center;color:#7a8494;font-size:12px;margin:10px}.error{color:#c33}@media(min-width:760px){body{padding:24px}.app{height:calc(100vh - 48px);border-radius:18px;overflow:hidden}}