:root { color-scheme: light dark; }
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: #f4f5f7;
  color: #1c1e21;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
@media (prefers-color-scheme: dark) {
  body { background: #17181c; color: #e8e8ea; }
  .card { background: #212329 !important; border-color: #33363e !important; }
  input { background: #17181c; color: #e8e8ea; border-color: #3a3d45 !important; }
  .muted { color: #9a9da6 !important; }
  a { color: #7ab7ff; }
  code, .codebox { background: #17181c !important; border-color: #3a3d45 !important; }
}
header {
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
header .brand { font-weight: 700; font-size: 17px; text-decoration: none; color: inherit; letter-spacing: 0.2px; }
main { flex: 1; display: flex; align-items: flex-start; justify-content: center; padding: 40px 16px 64px; }
.card {
  background: #fff;
  border: 1px solid #e3e5e9;
  border-radius: 10px;
  padding: 28px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}
.card.wide { max-width: 560px; }
h1 { font-size: 20px; margin: 0 0 6px; }
p { line-height: 1.5; }
.muted { color: #616570; font-size: 13.5px; }
label { display: block; font-size: 13px; font-weight: 600; margin: 14px 0 4px; }
input {
  width: 100%;
  padding: 9px 10px;
  font-size: 14px;
  border: 1px solid #c9ccd3;
  border-radius: 7px;
}
input:focus { outline: 2px solid #4a7dff; outline-offset: 0; border-color: transparent; }
.btn {
  display: inline-block;
  border: 1px solid transparent;
  border-radius: 7px;
  padding: 9px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}
.btn-primary { background: #1c1e21; color: #fff; }
.btn-primary:hover { background: #33363c; }
.btn-secondary { background: transparent; color: inherit; border-color: #c9ccd3; }
.btn-secondary:hover { background: rgba(127,127,127,0.08); }
.btn[disabled] { opacity: 0.45; cursor: not-allowed; }
.btn-row { display: flex; gap: 10px; margin-top: 20px; }
.btn-block { width: 100%; margin-top: 18px; }
.error {
  background: #fdecea;
  color: #b3261e;
  border: 1px solid #f5c6c0;
  border-radius: 7px;
  padding: 10px 12px;
  font-size: 13.5px;
  margin: 14px 0 0;
}
.notice {
  background: #eef4ff;
  color: #1a3a7a;
  border: 1px solid #cfe0ff;
  border-radius: 7px;
  padding: 10px 12px;
  font-size: 13.5px;
  margin: 14px 0 0;
}
.success {
  background: #eaf7ee;
  color: #1a6b34;
  border: 1px solid #c5e9d1;
  border-radius: 7px;
  padding: 10px 12px;
  font-size: 13.5px;
  margin: 14px 0 0;
}
@media (prefers-color-scheme: dark) {
  .error { background: #3a2020; color: #ff8a80; border-color: #5c2b2b; }
  .notice { background: #1c2740; color: #a9c7ff; border-color: #2c3e63; }
  .success { background: #16301f; color: #86e0a3; border-color: #274b34; }
}
.codebox {
  display: block;
  background: #f4f5f7;
  border: 1px solid #e3e5e9;
  border-radius: 7px;
  padding: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 14px;
  word-break: break-all;
  user-select: all;
  margin: 14px 0;
}
.kv { margin: 14px 0 0; font-size: 14px; }
.kv dt { font-weight: 600; font-size: 12.5px; color: #616570; margin-top: 10px; }
.kv dd { margin: 2px 0 0; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.pill {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  border-radius: 99px;
  padding: 2px 10px;
  background: #e8f0fe;
  color: #1a56db;
}
form.inline { display: inline; }
.footer-note { margin-top: 22px; padding-top: 14px; border-top: 1px solid #e3e5e9; font-size: 13px; color: #616570; display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.linklike { background: none; border: none; color: #1a56db; cursor: pointer; font-size: 13px; padding: 0; text-decoration: underline; }