.auth {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 16px;
  background:
    radial-gradient(1200px 600px at 50% -10%, var(--accent-wash), transparent 60%),
    var(--bg);
}
.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 28px;
  box-shadow: var(--sh-2);
}
.auth-brand {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 18px;
}
.auth-brand .brand-name { font-weight: 700; font-size: 17px; letter-spacing: -.01em; }
.auth-logo { height: 28px; }
.auth-title {
  margin: 0 0 4px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -.015em;
}
.auth-sub {
  margin: 0 0 22px;
  color: var(--ink-3);
  font-size: 13.5px;
}
.auth-form { display: flex; flex-direction: column; gap: 14px; }
.auth-submit { justify-content: center; height: 40px; }
.auth-error {
  background: var(--bad-soft);
  color: var(--bad);
  padding: 8px 12px;
  border-radius: var(--r-sm);
  font-size: 12.5px;
}
.auth-notice {
  background: var(--good-soft);
  color: var(--good);
  padding: 8px 12px;
  border-radius: var(--r-sm);
  font-size: 12.5px;
}

/* --- Social login --------------------------------------------------- */
.social-divider {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 20px 0 14px;
  font-size: 11.5px;
  color: var(--ink-4);
  text-transform: uppercase;
  letter-spacing: .08em;
}
.social-divider-line {
  flex: 1;
  height: 1px;
  background: var(--line);
}
.social-buttons {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line-2);
  border-radius: 10px;
  background: var(--bg-elev);
  color: var(--ink);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  transition: background .12s, border-color .12s;
}
.social-btn:hover {
  background: var(--bg-sunk);
  border-color: var(--line-3);
}
.social-btn[data-provider="microsoft"] svg { color: inherit; }

/* --- 2FA-specific --------------------------------------------------- */
.checkbox-row {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--ink-3);
  user-select: none;
  cursor: pointer;
}
.checkbox-row input[type="checkbox"] {
  appearance: none;
  width: 16px; height: 16px;
  border: 1px solid var(--line-2);
  border-radius: 4px;
  background: var(--bg-elev);
  display: inline-block;
  position: relative;
  cursor: pointer;
}
.checkbox-row input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent-deep);
}
.checkbox-row input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  left: 4px; top: 1px;
  width: 5px; height: 9px;
  border: solid var(--ink);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.auth-aux {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 16px;
  font-size: 12.5px;
  color: var(--ink-3);
}
.link-btn {
  background: none;
  border: 0;
  padding: 0;
  color: var(--ink-3);
  text-decoration: underline;
  text-underline-offset: 2px;
  font-size: 12.5px;
  cursor: pointer;
}
.link-btn:hover { color: var(--ink); }