.signup-page {
  margin: 0;
  min-height: 100dvh;
  color-scheme: dark;
  background: var(--site-canvas);
  color: var(--site-text);
  font-family: system-ui, sans-serif;
}
.signup-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  min-height: 74px;
  padding: 0 clamp(1rem, 5vw, 4rem);
  border-bottom: 1px solid var(--site-line);
}
.signup-brand {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  color: var(--site-yellow);
  text-decoration: none;
  font-size: 1.35rem;
  font-weight: 800;
}
.signup-card {
  box-sizing: border-box;
  width: min(460px, calc(100% - 2rem));
  margin: clamp(2rem, 8vh, 5rem) auto;
  padding: clamp(1.25rem, 5vw, 2.5rem);
  background: var(--site-panel);
  border: 1px solid var(--site-line);
  border-radius: 20px;
}
.signup-card h1 { margin: 0; font-size: clamp(1.75rem, 6vw, 2.5rem); letter-spacing: -.05em; }
.signup-note { color: var(--site-muted); margin: .7rem 0 1.4rem; }
.signup-card fieldset { display: grid; gap: 1rem; padding: 0; margin: 0; border: 0; }
.signup-card label { display: grid; gap: .4rem; font-size: .9rem; font-weight: 650; }
.signup-card input {
  border: 1px solid var(--site-line);
  border-radius: 9px;
  padding: .7rem .8rem;
  background: var(--site-control);
  color: var(--site-text);
  font: inherit;
}
.signup-card button:disabled { opacity: .55; cursor: default; }

.account-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .35rem;
  margin: 0 0 1.3rem;
  padding: .3rem;
  border: 1px solid var(--site-line);
  border-radius: 11px;
  background: var(--site-canvas);
}
.account-switch button {
  border: 1px solid transparent;
  border-radius: 8px;
  padding: .55rem;
  background: transparent;
  color: var(--site-muted);
  font: 700 .9rem/1.2 system-ui, sans-serif;
  cursor: pointer;
}
.account-switch button[aria-pressed="true"] {
  background: var(--site-yellow);
  color: var(--site-yellow-ink);
}
.account-switch button:focus-visible { outline: 2px solid var(--site-yellow); outline-offset: 2px; }