:root {
  --paper: #f7f1e6;
  --ink: #16130f;
  --gold: #ffc84a;
  --green: #48d89b;
  --red: #ff6b5f;
  --line: rgba(255, 255, 255, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  color: var(--paper);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 18% 16%, rgba(255, 200, 74, 0.24), transparent 28%),
    radial-gradient(circle at 82% 12%, rgba(72, 216, 155, 0.18), transparent 30%),
    linear-gradient(135deg, #17130f 0%, #262019 46%, #0f1917 100%);
}

.login-shell {
  width: min(440px, 100%);
}

.login-card {
  padding: 28px 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(16, 26, 40, 0.92);
  box-shadow: 0 20px 54px rgba(0, 0, 0, 0.32);
}

.login-kicker {
  margin: 0 0 8px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
}

h1 {
  margin: 0 0 8px;
  font-size: 28px;
}

.login-lead {
  margin: 0 0 20px;
  color: rgba(247, 241, 230, 0.78);
  font-size: clamp(13px, 3.5vw, 15px);
  line-height: 1.55;
}

.login-lead-device {
  white-space: nowrap;
}

.login-lead-device strong {
  font-weight: 900;
}

.login-form label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 700;
}

.login-form input {
  width: 100%;
  min-height: 48px;
  padding: 0 14px;
  color: var(--paper);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.28);
  font-size: 18px;
}

#codeInput {
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.login-form input:focus {
  outline: 2px solid rgba(255, 200, 74, 0.45);
  border-color: rgba(255, 200, 74, 0.72);
}

.device-usage {
  margin: 12px 0 0;
  color: var(--green);
  font-size: 14px;
  font-weight: 700;
}

.error-box {
  margin: 0;
  color: var(--red);
  font-size: 14px;
  line-height: 1.5;
}

.error-panel {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  align-items: baseline;
  margin-top: 12px;
}

.error-panel .help-link-button {
  margin: 0;
  flex: 0 0 auto;
}

.self-unbind-button {
  flex: 1 1 100%;
  min-height: 40px;
  margin-top: 4px;
  padding: 0 14px;
  color: var(--paper);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
}

.self-unbind-button:hover:not(:disabled) {
  border-color: rgba(72, 216, 155, 0.55);
  color: var(--green);
}

.self-unbind-button:disabled {
  opacity: 0.6;
  cursor: wait;
}

.login-form button[type="submit"],
.login-form #loginButton {
  width: 100%;
  min-height: 46px;
  margin-top: 18px;
  color: #16130f;
  border: 1px solid rgba(255, 200, 74, 0.72);
  border-radius: 999px;
  background: var(--gold);
  font-size: 15px;
  font-weight: 900;
  cursor: pointer;
}

.login-form button[type="submit"]:disabled,
.login-form #loginButton:disabled {
  opacity: 0.6;
  cursor: wait;
}

.login-help {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(247, 241, 230, 0.72);
  font-size: 13px;
  line-height: 1.6;
}

.login-help ul {
  margin: 8px 0 0;
  padding-left: 18px;
}

.login-help a {
  color: var(--gold);
}

.help-link-button {
  margin: 0 0 10px;
  padding: 0;
  color: var(--gold);
  border: none;
  background: transparent;
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}

.help-link-button:hover {
  color: var(--green);
}

.unbind-help-dialog {
  width: min(360px, calc(100vw - 32px));
  max-width: calc(100vw - 32px);
  margin: auto;
  padding: 0;
  color: var(--paper);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 12px;
  background: #101a28;
  box-shadow: 0 20px 54px rgba(0, 0, 0, 0.55);
  color-scheme: dark;
}

.unbind-help-dialog:not([open]) {
  display: none;
}

.unbind-help-dialog::backdrop {
  background: rgba(0, 0, 0, 0.72);
}

.unbind-help-dialog > h2,
.unbind-help-dialog > p,
.unbind-help-dialog > ol,
.unbind-help-dialog > form {
  padding-left: 20px;
  padding-right: 20px;
}

.unbind-help-dialog > h2 {
  margin: 0;
  padding-top: 22px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 20px;
  color: #fff7ea;
}

.unbind-help-dialog > p,
.unbind-help-dialog > ol {
  padding-top: 14px;
}

.unbind-help-dialog p,
.unbind-help-dialog li {
  margin: 0 0 10px;
  color: rgba(247, 241, 230, 0.88);
  font-size: 14px;
  line-height: 1.6;
}

.unbind-help-dialog ol {
  margin: 0 0 10px;
  padding-left: 36px;
  padding-right: 20px;
}

.unbind-help-dialog strong {
  color: var(--gold);
}

.unbind-help-note {
  margin-bottom: 0 !important;
  padding-bottom: 8px !important;
  color: rgba(247, 241, 230, 0.72) !important;
  font-size: 13px !important;
}

.unbind-help-dialog form {
  display: flex;
  justify-content: flex-end;
  padding-top: 8px;
  padding-bottom: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.dialog-close-button {
  min-height: 40px;
  padding: 0 18px;
  color: #16130f;
  border: 1px solid rgba(255, 200, 74, 0.72);
  border-radius: 999px;
  background: var(--gold);
  font: inherit;
  font-size: 14px;
  font-weight: 900;
  cursor: pointer;
}

.dialog-close-button:hover {
  background: #ffd86a;
}

.ghost-button {
  margin-top: 12px;
  min-height: 36px;
  padding: 0 14px;
  color: var(--paper);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
}

.ghost-button:hover {
  border-color: rgba(72, 216, 155, 0.5);
}

@media (max-width: 420px) {
  body {
    padding: 16px;
  }

  .login-card {
    padding: 22px 18px;
  }

  h1 {
    font-size: 24px;
  }

  .login-lead {
    font-size: 13px;
  }
}