/* System fonts only — no external resources. */
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 17px/1.45 -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  background: #f5f6f8;
  color: #1b1f24;
}
main { max-width: 640px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.4rem; margin: 8px 0 20px; }
.zh { font-weight: 600; }
form > label, fieldset { display: block; margin: 0 0 16px; }
input[type=text], input:not([type]) {
  display: block; width: 100%; margin-top: 6px; padding: 12px;
  font: inherit; border: 1px solid #b8bec7; border-radius: 8px; background: #fff;
}
fieldset { border: 1px solid #d5d9df; border-radius: 8px; padding: 8px 12px; background: #fff; }
legend { padding: 0 4px; font-weight: 600; }
.opt { display: flex; align-items: center; gap: 10px; padding: 8px 0; }
.opt input { width: 22px; height: 22px; margin: 0; }
.vpn { font-weight: 700; background: #fff4d6; border-radius: 8px; padding: 12px; margin-bottom: 16px; }
.button, button {
  display: block; width: 100%; padding: 16px; margin: 0 0 12px;
  font: inherit; font-weight: 700; text-align: center;
  border: 0; border-radius: 10px; cursor: pointer;
  background: #1d5fd1; color: #fff;
}
.button.secondary { background: #e3e8f0; color: #1b1f24; }
button:disabled { background: #8a97ab; }
.muted { color: #5b6470; font-size: .9rem; margin: 0 0 16px; }
.big { font-size: 1.3rem; font-weight: 700; }
table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 8px; overflow: hidden; }
th, td { padding: 10px 8px; border-bottom: 1px solid #e3e6ea; text-align: left; vertical-align: top; font-size: .95rem; }
th { background: #eef1f5; }
.mark { font-size: 1.8rem; line-height: 1; display: block; }
.detail { font-size: .85rem; color: #3d4550; word-break: break-word; }
.ok { color: #10703b; }
.fail { color: #b3261e; }
#dump { white-space: pre-wrap; font-size: 1rem; background: #fff; padding: 12px; border-radius: 8px; }