:root{--brand:#5b6cff;--brand-soft:#eef0ff;--bg:#f5f6fa;--bubble-bot:#fff;--bubble-user:#5b6cff;--text:#1f2330;--muted:#8a90a2;--line:#e7e9f0;--shadow:0 6px 24px rgba(40,48,90,.08)}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}body,html{margin:0;padding:0;height:100%}body{font-family:Segoe UI,Sarabun,system-ui,-apple-system,Noto Sans Thai,sans-serif;color:var(--text);font-size:16px;line-height:1.6}.app,body{background:var(--bg)}.app{max-width:760px;margin:0 auto;height:100dvh;display:flex;flex-direction:column}.header{display:flex;align-items:center;gap:12px;padding:14px 18px;background:#fff;border-bottom:1px solid var(--line);position:-webkit-sticky;position:sticky;top:0;z-index:5}.avatar{width:42px;height:42px;border-radius:50%;background:linear-gradient(135deg,#5b6cff,#8a7bff);display:grid;place-items:center;color:#fff;font-size:22px;flex-shrink:0}.header .name{font-weight:700;font-size:17px}.header .status{font-size:12.5px;color:#2fb86a;display:flex;align-items:center;gap:5px}.header .status:before{content:"";width:7px;height:7px;border-radius:50%;background:#2fb86a}.header .spacer{flex:1 1}.icon-link{color:var(--muted);text-decoration:none;font-size:13px;padding:6px 10px;border-radius:8px}.icon-link:hover{background:var(--brand-soft);color:var(--brand)}.messages{flex:1 1;overflow-y:auto;padding:18px 16px 8px;display:flex;flex-direction:column;gap:12px}.row{display:flex;gap:8px;max-width:100%}.row.user{justify-content:flex-end}.bubble{max-width:80%;padding:11px 15px;border-radius:18px;white-space:pre-wrap;word-wrap:break-word;box-shadow:var(--shadow);font-size:15.5px}.row.bot .bubble{background:var(--bubble-bot);border-bottom-left-radius:6px}.row.user .bubble{background:var(--bubble-user);color:#fff;border-bottom-right-radius:6px}.mini-avatar{width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,#5b6cff,#8a7bff);display:grid;place-items:center;color:#fff;font-size:15px;flex-shrink:0;align-self:flex-end}.typing{display:inline-flex;gap:4px;align-items:center;padding:4px 2px}.typing span{width:7px;height:7px;background:#c2c7d6;border-radius:50%;animation:blink 1.3s infinite both}.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}@keyframes blink{0%,80%,to{opacity:.25;transform:translateY(0)}40%{opacity:1;transform:translateY(-3px)}}.chips{display:flex;flex-wrap:wrap;gap:8px;padding:4px 2px 2px}.chip{background:#fff;border:1px solid var(--line);color:var(--brand);padding:8px 13px;border-radius:20px;font-size:13.5px;cursor:pointer;transition:.15s}.chip:hover{background:var(--brand-soft);border-color:var(--brand)}.composer{display:flex;gap:10px;padding:12px 14px calc(12px + env(safe-area-inset-bottom));background:#fff;border-top:1px solid var(--line)}.composer textarea{flex:1 1;resize:none;border:1px solid var(--line);border-radius:22px;padding:11px 16px;font:inherit;font-size:15.5px;max-height:140px;outline:none;background:var(--bg)}.composer textarea:focus{border-color:var(--brand);background:#fff}.send{width:46px;height:46px;border:none;border-radius:50%;background:var(--brand);color:#fff;font-size:19px;cursor:pointer;flex-shrink:0;display:grid;place-items:center;transition:.15s}.send:disabled{opacity:.45;cursor:not-allowed}.send:not(:disabled):hover{transform:scale(1.05)}.admin{max-width:720px;margin:0 auto;padding:24px 18px 60px}.admin h1{font-size:22px}.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;margin-bottom:18px;box-shadow:var(--shadow)}.card h2{margin:0 0 12px;font-size:16px}.field{margin-bottom:14px}.field label{display:block;font-size:13.5px;color:var(--muted);margin-bottom:5px}.field input,.field textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;font:inherit;font-size:15px;outline:none}.field input:focus,.field textarea:focus{border-color:var(--brand)}.btn{background:var(--brand);color:#fff;border:none;border-radius:10px;padding:10px 18px;font:inherit;font-size:15px;cursor:pointer}.btn:disabled{opacity:.5}.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--brand)}.btn.danger{background:#fff;color:#e0405a;border:1px solid #f3c2cb;padding:6px 12px;font-size:13px}.doc{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--line)}.doc:last-child{border-bottom:none}.doc .badge{font-size:11px;font-weight:700;color:var(--brand);background:var(--brand-soft);padding:3px 8px;border-radius:6px}.doc .meta{font-size:12.5px;color:var(--muted)}.dropzone{border:2px dashed var(--line);border-radius:12px;padding:26px;text-align:center;color:var(--muted);cursor:pointer}.dropzone.drag{border-color:var(--brand);background:var(--brand-soft);color:var(--brand)}.toast{font-size:13.5px;margin-top:8px}.toast.ok{color:#2fb86a}.toast.err{color:#e0405a}.center-box{max-width:380px;margin:12vh auto 0}