/* 蓝白渐变配方，字体微软雅黑 */
:root{
  --bg1: #e6f0ff;
  --bg2: #ffffff;
  --accent: #0066cc;
  --font: "Microsoft Yahei", "微软雅黑", Arial, sans-serif;
}
*{box-sizing:border-box}
body{
  margin:0;
  padding:0;
  font-family:var(--font);
  background:linear-gradient(180deg,var(--bg1),var(--bg2));
  color:#033;
}
.container{
  max-width:900px;
  margin:40px auto;
  background:rgba(255,255,255,0.8);
  padding:20px;
  border-radius:8px;
  box-shadow:0 6px 20px rgba(0,0,0,0.08);
}
h1{color:var(--accent);}
.buttons{display:flex;gap:12px}
.btn{
  display:inline-block;
  padding:12px 18px;
  background:linear-gradient(180deg,#3da0ff,#0066cc);
  color:white;text-decoration:none;border-radius:6px
}
.msg{color:#a00}
.top{display:flex;justify-content:space-between;align-items:center}
.create-chat, .chat-list, .messages{margin-top:16px}
.messages-box{height:300px;overflow:auto;border:1px solid #e0e8ff;padding:8px;border-radius:6px;background:linear-gradient(180deg,#fff,#f6fbff)}
.message{padding:6px 8px;border-radius:6px;margin-bottom:6px;background:#eef6ff}
.send{display:flex;gap:8px;margin-top:8px}
input{padding:8px;border:1px solid #d6e6ff;border-radius:4px;width:100%}
button{padding:8px 12px;border-radius:4px;border:0;background:#0077dd;color:#fff}
.note{margin-top:12px;color:#666}