.auth-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
}
@media (max-width: 860px) { .auth-shell { grid-template-columns: 1fr; } }

.auth-visual {
  background: var(--ink);
  color: var(--paper);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 48px;
  position: relative;
  overflow: hidden;
}
.auth-visual::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(169,124,60,0.25), transparent 55%);
}
.auth-visual .brand { color: var(--paper); }
.auth-visual .brand span { color: var(--gold-soft); }
.auth-visual .quote {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 400;
  max-width: 20ch;
  position: relative; z-index: 1;
}
.auth-visual .quote-foot { color: var(--gold-soft); font-size: 0.85rem; letter-spacing: 0.02em; position: relative; z-index: 1; }
@media (max-width: 860px) { .auth-visual { display: none; } }

.auth-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 24px;
}
.auth-box { width: 100%; max-width: 400px; }
.auth-box h1 { font-size: 2rem; margin-bottom: 4px; }
.auth-sub { color: var(--ink-soft); margin-bottom: 28px; }

.oauth-btn {
  width: 100%; display: flex; align-items: center; justify-content: center; gap: 10px;
  padding: 13px; border: 1px solid var(--line); border-radius: var(--r-sm);
  background: var(--card); cursor: pointer; font-family: var(--font-body); font-size: 0.95rem; font-weight: 500;
}
.oauth-btn:hover { border-color: var(--ink); }

.auth-divider { display: flex; align-items: center; gap: 14px; margin: 22px 0; color: var(--ink-soft); font-size: 0.82rem; }
.auth-divider::before, .auth-divider::after { content: ''; flex: 1; height: 1px; background: var(--line); }

.auth-foot { margin-top: 22px; text-align: center; font-size: 0.9rem; color: var(--ink-soft); }
.auth-foot a { color: var(--gold); font-weight: 500; }
.auth-link { font-size: 0.85rem; color: var(--gold); }
.auth-error {
  background: rgba(162,75,63,0.08); border: 1px solid rgba(162,75,63,0.3); color: var(--danger);
  padding: 12px 14px; border-radius: var(--r-sm); font-size: 0.87rem; margin-bottom: 18px; display: none;
}
.auth-error.show { display: block; }