:root{
  --indigo:#5B6CFF;
  --indigo-deep:#4453E6;
  --bg:#F6F7FB;
  --card:#FFFFFF;
  --ink:#151824;
  --ink2:#5B6075;
  --ink3:#9AA0B4;
  --line:#ECEEF6;
  --danger:#E0574F;
  --radius:16px;
}

*{margin:0;padding:0;box-sizing:border-box}
[hidden]{display:none!important}

html,body{height:100%}

body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
  overscroll-behavior-y:none;
}

.app{
  height:100%;
  display:flex;
  flex-direction:column;
  max-width:760px;
  margin:0 auto;
  background:var(--bg);
}

.bar{
  flex:none;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:calc(10px + env(safe-area-inset-top)) 16px 10px;
  background:rgba(246,247,251,.86);
  backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid rgba(20,26,60,.05);
  position:sticky;
  top:0;
  z-index:5;
}

.brand{display:flex;align-items:center;gap:10px;min-width:0}

.logo{
  width:34px;height:34px;border-radius:11px;flex:none;
  background:linear-gradient(145deg,#7C89FF,#4E5CEC);
  color:#fff;font-size:15px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 10px rgba(91,108,255,.3);
}

.brand-text{min-width:0}
.name{font-size:14.5px;font-weight:600;letter-spacing:-.2px}
.meta{font-size:11px;color:var(--ink3);margin-top:2px;display:flex;align-items:center;gap:5px}
.meta .dot{width:5px;height:5px;border-radius:50%;background:#3BA169;display:inline-block}
.meta.busy .dot{background:#E0A21C;animation:pulse 1.1s infinite}

@keyframes pulse{0%,100%{opacity:1}50%{opacity:.25}}

.icon-btn{
  width:34px;height:34px;border-radius:11px;border:1px solid var(--line);
  background:#fff;color:var(--ink2);cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:background .15s,border-color .15s;
}
.icon-btn:hover{background:#F2F4FF;border-color:#DFE3FF;color:var(--indigo)}

.stream{
  flex:1;
  overflow-y:auto;
  padding:18px 16px 8px;
  -webkit-overflow-scrolling:touch;
  display:flex;
  flex-direction:column;
}

.list{display:flex;flex-direction:column;gap:16px;flex:none}

.empty{
  flex:1;
  min-height:300px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;padding:24px 8px 0;
}
.empty h1{font-size:21px;font-weight:600;letter-spacing:-.3px;margin-top:14px}
.empty p{font-size:12.5px;color:var(--ink3);margin-top:7px;line-height:1.6}
.chips{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:18px}
.chip{
  border:1px solid var(--line);background:#fff;color:var(--ink2);
  padding:8px 13px;border-radius:12px;font-size:12.5px;cursor:pointer;
  font-family:inherit;transition:.15s;
}
.chip:hover{border-color:#D8DDFF;background:#F5F6FF;color:var(--indigo)}

.msg{display:flex;gap:9px;align-items:flex-start}
.msg.user{justify-content:flex-end}

.bubble{
  background:var(--card);
  border-radius:var(--radius) var(--radius) var(--radius) 5px;
  padding:12px 14px;
  font-size:14.5px;
  line-height:1.72;
  max-width:86%;
  box-shadow:0 2px 10px rgba(24,31,70,.05);
  word-break:break-word;
  overflow-wrap:anywhere;
}

.msg.user .bubble{
  background:var(--indigo);
  color:#fff;
  border-radius:var(--radius) var(--radius) 5px var(--radius);
  box-shadow:0 4px 14px rgba(91,108,255,.28);
}

.bubble p{margin:0 0 8px}
.bubble p:last-child{margin-bottom:0}
.bubble h3{font-size:15px;font-weight:600;margin:12px 0 6px;letter-spacing:-.2px}
.bubble h4{font-size:14px;font-weight:600;margin:10px 0 5px}
.bubble h3:first-child,.bubble h4:first-child{margin-top:0}
.bubble ul{margin:6px 0 8px;padding-left:18px}
.bubble ol{margin:6px 0 8px;padding-left:20px}
.bubble li{margin:3px 0}
.bubble li::marker{color:#B9BFD2}
.bubble pre{
  background:#0F1220;color:#E6E9F5;padding:11px 12px;border-radius:10px;
  overflow-x:auto;margin:8px 0;font-size:12.5px;line-height:1.6;
}
.bubble code{
  font-family:"SF Mono",ui-monospace,Menlo,monospace;
  font-size:.92em;background:#F1F3FA;padding:1px 5px;border-radius:5px;
}
.bubble pre code{background:none;padding:0;color:inherit}
.msg.user .bubble code{background:rgba(255,255,255,.18)}

.think{
  background:#FAFBFF;border:1px solid #EDF0FA;border-radius:12px;
  padding:9px 12px;margin-bottom:10px;font-size:12.5px;
}
.think summary{
  cursor:pointer;color:var(--ink3);font-size:12px;list-style:none;
  display:flex;align-items:center;gap:6px;user-select:none;
}
.think summary::-webkit-details-marker{display:none}
.think summary::before{content:"▸";font-size:10px;transition:transform .15s}
.think[open] summary::before{transform:rotate(90deg)}
.think-body{
  margin-top:8px;padding-left:10px;border-left:2px solid #E3E7F7;
  color:#8C93A8;line-height:1.65;white-space:pre-wrap;
  max-height:220px;overflow-y:auto;
}

.cursor{
  display:inline-block;width:7px;height:15px;border-radius:2px;
  background:var(--indigo);vertical-align:-2px;margin-left:2px;
  animation:blink 1s steps(2) infinite;
}
@keyframes blink{50%{opacity:0}}

.composer{
  flex:none;
  padding:8px 12px calc(10px + env(safe-area-inset-bottom));
  background:rgba(246,247,251,.94);
  backdrop-filter:saturate(180%) blur(14px);
  border-top:1px solid rgba(20,26,60,.05);
}

.input-wrap{
  display:flex;align-items:flex-end;gap:8px;
  background:#fff;border:1px solid var(--line);border-radius:18px;
  padding:7px 7px 7px 14px;
  box-shadow:0 2px 12px rgba(24,31,70,.05);
  transition:border-color .15s,box-shadow .15s;
}
.input-wrap:focus-within{border-color:#C9CFFF;box-shadow:0 4px 18px rgba(91,108,255,.14)}

textarea{
  flex:1;border:none;outline:none;resize:none;background:transparent;
  font-family:inherit;font-size:16px;line-height:1.55;color:var(--ink);
  max-height:132px;padding:6px 0;
}
textarea::placeholder{color:#B4B9CC}

.send{
  width:36px;height:36px;flex:none;border:none;border-radius:13px;cursor:pointer;
  background:linear-gradient(150deg,#7C89FF,#4E5CEC);color:#fff;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 12px rgba(91,108,255,.32);
  transition:opacity .15s,transform .1s;
}
.send:active{transform:scale(.94)}
.send[disabled]{opacity:.4;box-shadow:none;cursor:default}
.send.stop{background:#1B1E2B;box-shadow:none}

.hint{text-align:center;font-size:10.5px;color:#BFC4D3;margin-top:7px}

.bar-actions{display:flex;gap:8px}

.login{
  min-height:100%;
  display:flex;align-items:center;justify-content:center;
  padding:24px;
  background:
    radial-gradient(900px 420px at 50% -10%, #E7EAFE 0%, rgba(246,247,251,0) 62%),
    var(--bg);
}

.login-card{
  width:100%;max-width:340px;background:#fff;border-radius:22px;
  padding:28px 24px 24px;
  box-shadow:0 24px 60px rgba(24,31,70,.12);
  border:1px solid rgba(20,26,60,.04);
}
.login-logo{
  width:46px;height:46px;border-radius:15px;
  background:linear-gradient(145deg,#7C89FF,#4E5CEC);
  color:#fff;font-size:20px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 8px 18px rgba(91,108,255,.32);
}
.login-card h1{font-size:21px;font-weight:600;letter-spacing:-.3px;margin-top:16px}
.login-sub{font-size:12.5px;color:var(--ink3);margin-top:6px}

.field{display:block;margin-top:16px}
.field span{display:block;font-size:11.5px;color:var(--ink3);margin-bottom:6px}
.field input{
  width:100%;height:44px;border:1px solid var(--line);border-radius:12px;
  padding:0 13px;font-size:16px;font-family:inherit;outline:none;background:#FBFCFE;
  transition:border-color .15s,background .15s;
}
.field input:focus{border-color:#C9CFFF;background:#fff}

.login-err{color:var(--danger);font-size:12px;margin-top:12px;min-height:16px;line-height:1.5}
.login-btn{
  width:100%;height:46px;margin-top:4px;border:none;border-radius:13px;
  background:linear-gradient(150deg,#7C89FF,#4E5CEC);color:#fff;
  font-size:15px;font-weight:600;font-family:inherit;cursor:pointer;
  box-shadow:0 8px 20px rgba(91,108,255,.3);
}
.login-btn:disabled{opacity:.55;box-shadow:none;cursor:default}

.app[hidden],.login[hidden]{display:none}

.toast{
  position:fixed;left:50%;bottom:110px;transform:translateX(-50%);
  background:rgba(24,28,45,.92);color:#fff;font-size:12.5px;
  padding:9px 14px;border-radius:11px;z-index:30;max-width:80%;
  opacity:0;pointer-events:none;transition:opacity .2s;
}
.toast.on{opacity:1}

@media (max-width:420px){
  .bubble{max-width:90%}
  .stream{padding:14px 12px 6px}
}