*{margin:0;padding:0;box-sizing:border-box}
:root{--primary:#6C5CE7;--accent:#A29BFE;--gradient:linear-gradient(135deg,#6C5CE7,#A29BFE);--bg:#F0F0F8;--surface:#FFF;--text:#2D3436;--text-2:#636E72;--text-3:#B2BEC3;--border:#E8E8F0;--radius:18px;--radius-sm:12px;--font:'Noto Sans SC',-apple-system,sans-serif}
body{font-family:var(--font);background:var(--bg);color:var(--text);height:100vh;height:100dvh;display:flex;flex-direction;max-width:560px;margin:0 auto;-webkit-font-smoothing:antialiased}
.header{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;background:rgba(255,255,255,.8);backdrop-filter:blur(20px);border-bottom:1px solid var(--border)}
.header-left{display:flex;align-items:center;gap:10px}
.back-btn{color:var(--text-2);display:flex}
.logo{width:30px;height:30px;border-radius:9px;background:var(--gradient);display:flex;align-items:center;justify-content:center;color:white;font-weight:900;font-size:12px}
.header h1{font-size:16px;font-weight:800}
.dot{width:8px;height:8px;border-radius:50%}
.dot-online{background:#00B894}
.dot-offline{background:#B2BEC3}

.chat-messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:8px}
.system-msg{text-align:center;padding:20px;color:var(--text-3);font-size:13px}
.system-msg .sub{font-size:12px;margin-top:4px}

.msg{display:flex;flex-direction:column;max-width:80%}
.msg-self{align-self:flex-end}
.msg-other{align-self:flex-start}
.msg-bubble{padding:10px 14px;border-radius:var(--radius);font-size:14px;line-height:1.5;word-break:break-word}
.msg-self .msg-bubble{background:var(--gradient);color:white;border-bottom-right-radius:4px}
.msg-other .msg-bubble{background:var(--surface);color:var(--text);border:1px solid var(--border);border-bottom-left-radius:4px}
.msg-time{font-size:10px;color:var(--text-3);margin-top:4px;padding:0 4px}
.msg-self .msg-time{text-align:right}

.chat-input-bar{display:flex;gap:10px;padding:12px 16px;background:rgba(255,255,255,.9);backdrop-filter:blur(16px);border-top:1px solid var(--border);padding-bottom:max(12px,env(safe-area-inset-bottom))}
.chat-input{flex:1;padding:11px 16px;border:1.5px solid var(--border);border-radius:var(--radius);font-size:14px;outline:none;font-family:var(--font);background:var(--surface);transition:all .2s}
.chat-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(108,92,231,.1)}
.btn-send{width:44px;height:44px;border-radius:50%;border:none;background:var(--gradient);color:white;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 14px rgba(108,92,231,.3);transition:all .2s;flex-shrink:0}
.btn-send:hover{transform:scale(1.05)}
.btn-send:active{transform:scale(.92)}