*{box-sizing:border-box}
:root{--bg:#f7f7f8;--panel:#fff;--text:#202123;--muted:#6b7280;--line:#e5e7eb;--dark:#111827}
html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
body{min-height:100vh}
.app{min-height:100vh;display:flex;flex-direction:column}
.topbar{height:56px;display:flex;align-items:center;justify-content:space-between;padding:0 20px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.96);position:sticky;top:0;z-index:10}
.brand{display:flex;align-items:center;gap:9px;color:var(--text);text-decoration:none;font-size:14px;font-weight:650}
.logo{width:28px;height:28px;border-radius:8px;background:var(--dark);color:#fff;display:grid;place-items:center;font-size:11px;letter-spacing:.04em}
.status{font-size:12px;color:var(--muted)}
.main{width:min(900px,100%);margin:0 auto;flex:1;display:flex;flex-direction:column;padding:20px 20px 150px}
.thread{display:flex;flex-direction:column;gap:28px}
.welcome{text-align:center;padding:76px 0 48px}
.welcome h1{margin:0 0 14px;font-size:31px;font-weight:560;line-height:1.28;letter-spacing:-.02em}
.welcome h1 span{font-weight:560}
.welcome p{max-width:680px;margin:0 auto;color:var(--muted);font-size:14px;line-height:1.7}
.message{display:flex;gap:13px;align-items:flex-start}
.avatar{flex:0 0 30px;width:30px;height:30px;border-radius:8px;display:grid;place-items:center;font-size:11px;font-weight:700}
.avatar.rv{background:var(--dark);color:#fff}
.avatar.user{background:#e5e7eb;color:#374151}
.bubble{min-width:0;flex:1}
.role{font-size:12px;font-weight:650;margin-bottom:7px}
.content{font-size:15px;line-height:1.7;white-space:pre-wrap;word-break:break-word}
.skill{border:1px solid var(--line);border-radius:12px;background:#fff;overflow:hidden}
.skill-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:11px 13px;border-bottom:1px solid var(--line);background:#fafafa}
.skill-title{font:600 12px/1.2 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:#374151}
.skill-actions{display:flex;gap:8px}
.skill-actions button{border:1px solid var(--line);background:#fff;border-radius:7px;padding:6px 9px;font-size:11px;cursor:pointer;color:var(--text)}
.skill-actions button:hover{background:#f3f4f6}
pre{margin:0;padding:18px;overflow:auto;background:#fff;color:#111827;font:13px/1.65 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace;white-space:pre-wrap;word-break:break-word}
.loading{color:var(--muted);font-size:14px}
.error{color:#b42318;font-size:14px;line-height:1.6}
.composer-wrap{position:fixed;left:0;right:0;bottom:0;background:linear-gradient(to top,var(--bg) 72%,rgba(247,247,248,0));padding:26px 16px 18px;z-index:9}
.composer{width:min(900px,100%);margin:0 auto;background:#fff;border:1px solid #d9dce1;border-radius:18px;box-shadow:0 8px 30px rgba(0,0,0,.06);padding:12px}
textarea{width:100%;min-height:56px;max-height:190px;border:0;outline:0;resize:none;padding:4px 4px 10px;background:transparent;color:var(--text);font:15px/1.55 inherit}
.composer-bottom{display:flex;align-items:center;justify-content:space-between;gap:12px}
.hint{font-size:11px;color:var(--muted);padding-left:4px}
.send{width:34px;height:34px;border:0;border-radius:10px;background:var(--dark);color:#fff;display:grid;place-items:center;cursor:pointer;font-size:17px}
.send:disabled{opacity:.45;cursor:not-allowed}
@media(max-width:640px){.topbar{padding:0 14px}.main{padding:14px 14px 140px}.welcome{padding-top:50px}.welcome h1{font-size:25px}.welcome p{font-size:13px}.message{gap:10px}.avatar{width:27px;height:27px;flex-basis:27px}pre{padding:14px;font-size:12px}.composer-wrap{padding-left:10px;padding-right:10px}}