* { margin:0; padding:0; box-sizing:border-box; }
:root {
  --blue:#0e3f8f; --blue2:#1a5fd0;
  --bg:#f4f6fa; --line:#e3e8f0;
  --text:#333; --muted:#7a869a;
  --bg2:#eef3f8; --bg3:#eaf1fb;
  --text2:#5b6470; --text3:#889;
}
body { font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif; background:var(--bg); color:var(--text); font-size:14px; }
/* 键盘导航焦点可见性（无障碍） */
:focus-visible { outline:2px solid #1a5fd0; outline-offset:1px; border-radius:4px; }