.auth-page {
  min-height: 100vh;
  background: var(--bone-100);
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

.auth-page .site-header {
  z-index: 40;
}

.auth-main {
  position: relative;
  flex: 1;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 48px 24px 80px;
  overflow: hidden;
}

.auth-halo {
  position: absolute;
  inset: 0 -20% auto -20%;
  height: 70%;
  background: var(--gradient-halo);
  pointer-events: none;
}

.auth-card {
  position: relative;
  width: 100%;
  max-width: 440px;
  background: var(--surface-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-3);
  padding: 32px 28px 28px;
}

.auth-intro {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.auth-intro h1 {
  font-family: var(--font-serif-display);
  font-weight: var(--fw-light);
  font-size: clamp(26px, 4vw, 32px);
  letter-spacing: var(--ls-display);
  line-height: var(--lh-title);
}

.auth-intro p {
  font-size: var(--fs-body-sm);
  color: var(--text-muted);
}

.tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 4px;
  background: var(--bone-200);
  border-radius: var(--radius-pill);
  margin-bottom: 24px;
}

.tab {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-sans-ui);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  min-height: 36px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: var(--transition-control);
}

.tab.is-active {
  background: var(--surface-card);
  color: var(--text-strong);
  box-shadow: var(--shadow-1);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.field label {
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  color: var(--text-body);
}

.field .hint {
  font-size: var(--fs-caption);
  color: var(--text-muted);
}

.input {
  width: 100%;
  font-family: var(--font-sans-ui);
  font-size: var(--fs-body);
  color: var(--text-strong);
  background: var(--surface-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 11px 14px;
  transition: var(--transition-control);
  outline: none;
}

.input:focus {
  border-color: var(--border-accent);
  box-shadow: var(--ring-focus);
}

.checks {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 4px 0 8px;
}

.check {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  cursor: pointer;
  font-size: var(--fs-body-sm);
  color: var(--text-body);
}

.check input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.check-box {
  width: 22px;
  height: 22px;
  flex: 0 0 auto;
  margin-top: 1px;
  border-radius: var(--radius-xs);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-card);
  border: 1px solid var(--border-strong);
  color: #fff;
  transition: var(--transition-control);
}

.check input:checked + .check-box {
  background: var(--accent);
  border-color: var(--accent);
}

.check input:focus-visible + .check-box {
  box-shadow: var(--ring-focus);
}

.form-error {
  margin: 0 0 16px;
  padding: 12px 14px;
  background: var(--clay-50);
  border: 1px solid var(--clay-100);
  border-radius: var(--radius-md);
  color: var(--clay-500);
  font-size: var(--fs-body-sm);
}

.form-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
}

.form-actions .btn {
  width: 100%;
}

.auth-foot {
  margin-top: 16px;
  text-align: center;
  font-size: var(--fs-caption);
  color: var(--text-faint);
}

.success {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 16px;
  padding: 12px 0 8px;
}

.success h1 {
  font-family: var(--font-serif-display);
  font-weight: var(--fw-light);
  font-size: clamp(26px, 4vw, 32px);
  letter-spacing: var(--ls-display);
}

.success p {
  font-size: var(--fs-body);
  color: var(--text-muted);
  max-width: 36ch;
}

.success .btn { margin-top: 8px; }

[hidden] { display: none !important; }

.nav-back {
  flex: 0 0 auto;
  padding: 8px 2px;
  color: var(--text-muted);
  font-size: var(--fs-body-sm);
  white-space: nowrap;
}

.nav-back:hover { color: var(--text-strong); }

@media (max-width: 800px) {
  .auth-card { padding: 28px 20px 24px; }
  .auth-main { padding: 32px 16px 64px; }
}