:root {
  --bg: #fff7f3; --card: #ffffff; --text: #222; --muted: #6b6b6b;
  --brand: #ee4d2d; --brand-ink: #fff; --border: #f0d9d2; --ok: #1f8a4c; --err: #c62828;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #16110f; --card: #221a17; --text: #f2ece9; --muted: #a99a95; --border: #3a2c27; --ok: #5cc98a; --err: #ff7b72; }
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px;
  background: var(--bg); color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { width: 100%; max-width: 480px; background: var(--card); border: 1px solid var(--border); border-radius: 18px; padding: 24px; }
h1 { margin: 0 0 4px; font-size: 24px; color: var(--brand); }
.sub { margin: 0 0 18px; color: var(--muted); }
.field { display: flex; gap: 8px; margin-bottom: 10px; }
input {
  flex: 1; min-width: 0; font: inherit; padding: 12px 14px; border-radius: 10px;
  border: 1px solid var(--border); background: transparent; color: var(--text);
}
input:focus { outline: 2px solid var(--brand); outline-offset: 1px; }
button, .btn {
  display: block; width: 100%; font: inherit; font-weight: 600; text-align: center; text-decoration: none;
  padding: 12px 14px; border-radius: 10px; border: 0; background: var(--brand); color: var(--brand-ink); cursor: pointer;
}
button:disabled { opacity: .6; cursor: wait; }
.ghost { background: transparent; color: var(--brand); border: 1px solid var(--brand); }
.small { width: auto; padding: 0 14px; }
#result { margin-top: 18px; }
#result:empty { display: none; }
.status { color: var(--muted); display: flex; align-items: center; gap: 10px; }
.spinner { width: 18px; height: 18px; border: 2px solid var(--border); border-top-color: var(--brand); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.error { color: var(--err); }
.link { word-break: break-all; font-weight: 600; color: var(--ok); margin: 0 0 10px; }
.actions { display: flex; gap: 8px; } .actions > * { flex: 1; }
.help { margin-top: 20px; color: var(--muted); font-size: 14px; }
.help summary { cursor: pointer; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
@media (prefers-reduced-motion: reduce) { .spinner { animation: none; } }