:root{font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif;color:#172033;background:#eef2f8;font-synthesis:none}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at 15% 0,#dce8ff 0,transparent 35%),#eef2f8}.shell{width:min(980px,100%);height:100vh;margin:auto;background:#fff;display:grid;grid-template-rows:auto 1fr auto;box-shadow:0 0 50px #213a6520}header{height:78px;display:flex;align-items:center;justify-content:space-between;padding:0 28px;border-bottom:1px solid #e9edf4}.brand{display:flex;align-items:center;gap:12px}.logo,.avatar{display:grid;place-items:center;color:#fff;background:linear-gradient(145deg,#426bff,#7757e8);font-weight:750}.logo{width:42px;height:42px;border-radius:14px}.avatar{width:34px;height:34px;border-radius:11px;font-size:11px;flex:none}.brand h1{font-size:17px;margin:0}.brand p{font-size:12px;color:#7b8496;margin:4px 0 0}.brand i{display:inline-block;width:7px;height:7px;border-radius:50%;background:#28bc7c;margin-right:4px}.ghost{border:1px solid #dde3ed;background:#fff;border-radius:10px;padding:9px 14px;color:#59647a;cursor:pointer}.messages{overflow-y:auto;padding:30px clamp(18px,5vw,54px);scroll-behavior:smooth}.message{display:flex;gap:10px;margin-bottom:24px;align-items:flex-start}.message.user{flex-direction:row-reverse}.message.user .avatar{background:#18233a}.bubble{max-width:min(72%,680px);background:#f3f5f9;border-radius:5px 18px 18px 18px;padding:14px 17px;line-height:1.65;font-size:14px;white-space:pre-wrap;overflow-wrap:anywhere}.user .bubble{background:#4d6ff0;color:#fff;border-radius:18px 5px 18px 18px}.bubble strong{display:block;margin-bottom:4px}.bubble p{margin:0}.typing::after{content:'▋';animation:blink 1s infinite}@keyframes blink{50%{opacity:0}}footer{border-top:1px solid #e9edf4;padding:14px clamp(18px,5vw,54px) 12px}.composer{display:flex;gap:9px;align-items:flex-end;border:1px solid #dce2ec;border-radius:16px;padding:8px;background:#fff;box-shadow:0 8px 25px #1e376510}.composer:focus-within{border-color:#6680ed;box-shadow:0 8px 28px #526fe51c}.attach{width:38px;height:38px;display:grid;place-items:center;border-radius:10px;background:#f1f4f9;color:#506079;font-size:23px;cursor:pointer}.attach input{display:none}textarea{flex:1;resize:none;border:0;outline:0;min-height:38px;max-height:150px;padding:9px 5px;font:inherit;color:inherit}#send{width:38px;height:38px;border:0;border-radius:11px;background:#506feb;color:#fff;font-size:21px;cursor:pointer}#send:disabled{opacity:.45;cursor:not-allowed}.hint{text-align:center;color:#a0a7b5;font-size:11px;margin:8px 0 0}.files{display:flex;gap:8px;overflow-x:auto}.file{background:#eef2ff;color:#52617b;border-radius:9px;padding:7px 10px;margin-bottom:8px;font-size:12px;white-space:nowrap}.file button{border:0;background:0;color:#8190aa;cursor:pointer}@media(max-width:600px){header{height:68px;padding:0 16px}.messages{padding-top:22px}.bubble{max-width:85%}.ghost{padding:8px 10px}}