/* DESIGN.md §8.1 — auth shell */
.auth-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 3fr 2fr;
  margin: 0;
}
.auth-stage {
  background: var(--pc-primary);
  color: var(--pc-white);
  padding: var(--space-10) var(--space-8);
  display: flex; flex-direction: column; justify-content: space-between;
  position: relative; overflow: hidden;
}
.auth-stage h1 {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 8vw, var(--text-display));
  font-weight: 700;
  text-transform: uppercase;
  line-height: 0.9;
  letter-spacing: var(--tracking-tight);
  margin: 0;
  color: var(--pc-white);
}
.auth-stage h1 em { color: var(--pc-peach); font-style: normal; }
.auth-stage__slogan {
  font-family: var(--font-display-regular);
  font-size: var(--text-md);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: rgba(255,255,255,0.85);
  margin: 0 0 var(--space-3);
  line-height: 1.3;
}
.auth-stage__signature {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: rgba(255,255,255,0.55);
  margin: 0;
}
.auth-form {
  background: var(--pc-paper);
  display: flex; align-items: center; justify-content: center;
  padding: var(--space-8);
}
@media (max-width: 720px) {
  .auth-shell { grid-template-columns: 1fr; }
  .auth-stage { display: none; }
}