.twsi-bar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin: calc(-1 * env(safe-area-inset-top, 0px)) 0 12px;
  padding: calc(8px + env(safe-area-inset-top, 0px)) 12px 8px;
  background: #1e40af; color: #fff; border-radius: 0 0 14px 14px;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.18);
}
.twsi-bar .twsi-title { font-weight: 700; font-size: 1rem; margin-right: auto; }
.twsi-bar form { margin: 0; }
.twsi-bar button {
  font: inherit; font-size: 0.9rem; min-height: 40px; padding: 6px 14px;
  border-radius: 999px; border: 1px solid rgba(255,255,255,0.5);
  background: rgba(255,255,255,0.12); color: #fff;
}
.twsi-stale {
  margin: 0 0 12px; padding: 10px 14px; border-radius: 12px;
  background: #fef3c7; color: #92400e; border: 1px solid #fcd34d; font-size: 0.92rem;
}
.twsi-auth {
  min-height: 100vh; margin: 0; display: flex; align-items: center; justify-content: center;
  font-family: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  background: #f4f6f9; color: #1a2332; padding: 24px 16px;
}
.twsi-card {
  width: 100%; max-width: 380px; background: #fff; border-radius: 18px;
  padding: 28px 22px; box-shadow: 0 12px 32px rgba(15, 23, 42, 0.10); border: 1px solid #e2e8f0;
}
.twsi-card img { width: 64px; height: 64px; border-radius: 14px; display: block; margin: 0 auto 12px; }
.twsi-card h1 { font-size: 1.35rem; text-align: center; margin: 0 0 6px; }
.twsi-card p { color: #5b6b7c; font-size: 0.92rem; margin: 0 0 14px; text-align: center; }
.twsi-card label { display: block; font-size: 0.95rem; margin-bottom: 6px; }
.twsi-card input[type=password] {
  width: 100%; font-size: 17px; padding: 12px 14px; border-radius: 12px;
  border: 1px solid #cbd5e1; box-sizing: border-box; margin-bottom: 14px;
}
.twsi-card button {
  width: 100%; font-size: 17px; padding: 12px; border: 0; border-radius: 12px;
  background: #2563eb; color: #fff; font-weight: 600;
}
.twsi-card .twsi-err { color: #b91c1c; background: #fee2e2; border-radius: 10px; padding: 8px 10px; }
@media (prefers-color-scheme: dark) {
  .twsi-auth { background: #0f172a; color: #e2e8f0; }
  .twsi-card { background: #1e293b; border-color: #334155; }
  .twsi-card p { color: #94a3b8; }
  .twsi-card input[type=password] { background: #0f172a; color: #e2e8f0; border-color: #475569; }
  .twsi-stale { background: #422006; color: #fcd34d; border-color: #92400e; }
}