CA/frontend/src/components/TopNav.tsx

import { useState, useEffect } from 'react';

interface TopNavProps {
  onLogout?: () => void;
}

function Clock() {
  const [time, setTime] = useState(new Date());
  useEffect(() => {
    const id = setInterval(() => setTime(new Date()), 1000);
    return () => clearInterval(id);
  }, []);
  return <span>{time.toLocaleTimeString('zh-CN', { hour: '2-digit', minute: '2-digit' })}</span>;
}

export function TopNav({ onLogout }: TopNavProps) {

  return (
    <nav className="h-[52px] bg-bg-card border-b border-border flex items-center px-5 fixed top-0 left-0 right-0 z-50">
      <div className="flex items-center gap-3">
        <div className="w-7 h-7 bg-primary rounded-md flex items-center justify-center">
          <svg className="w-4 h-4 fill-white" viewBox="0 0 24 24">
            <path d="M19 3H5c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h14c1.1 0 2-.9 2-2V5c0-1.1-.9-2-2-2zm-7 3c1.93 0 3.5 1.57 3.5 3.5S13.93 13 12 13s-3.5-1.57-3.5-3.5S10.07 6 12 6zm7 13H5v-.23c0-.62.28-1.2.76-1.58C7.47 15.82 9.64 15 12 15s4.53.82 6.24 2.19c.48.38.76.97.76 1.58V19z"/>
          </svg>
        </div>
        <span className="font-display font-semibold text-[15px] text-text-primary">
          WuhanChildRisk
        </span>
      </div>

      <div className="w-px h-5 bg-border ml-4 mr-4" />

      <span className="text-[13px] text-text-secondary">
        儿童呼吸道疾病风险监测预警平台
      </span>

      <div className="ml-auto flex items-center gap-5">
        <span className="text-[12px] text-text-muted">
          <Clock />
        </span>
        <div className="flex items-center gap-2 text-[13px] text-text-secondary">
          <svg className="w-4 h-4" fill="currentColor" viewBox="0 0 24 24">
            <path d="M12 12c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm0 2c-2.67 0-8 1.34-8 4v2h16v-2c0-2.66-5.33-4-8-4z"/>
          </svg>
          admin
        </div>
        {onLogout && (
          <button
            onClick={onLogout}
            className="text-[12px] text-text-muted hover:text-danger transition-colors"
          >
            退出
          </button>
        )}
      </div>
    </nav>
  );
}