.student-email-change {
  box-sizing: border-box;
  width: min(540px, calc(100vw - 24px));
  max-height: calc(100dvh - 24px);
  margin: auto;
  padding: clamp(20px, 4vw, 32px);
  overflow-y: auto;
  overscroll-behavior: contain;
  border: 1px solid var(--color-border);
  border-radius: 24px;
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: 0 28px 80px rgba(10, 32, 33, .3);
  z-index: 11000;
}
.student-email-change::backdrop { background: color-mix(in srgb, var(--color-bg) 85%, #102b2c 15%); }
.student-email-change__icon { width: 40px; height: 40px; padding: 8px; box-sizing: border-box; border-radius: 12px; color: var(--color-accent); background: var(--color-surface-2); }
.student-email-change__icon svg { width: 100%; height: 100%; }
.student-email-change h1 { font-size: clamp(1.35rem, 5vw, 1.8rem); line-height: 1.18; margin: 16px 0 12px; }
.student-email-change p { font-size: .9rem; line-height: 1.5; color: var(--text-secondary); }
.student-email-change .student-auth-form { gap: 12px; margin-top: 20px; }
.student-email-change .student-auth-form input { box-sizing: border-box; font-size: 16px; }
.student-email-change input[readonly] { background: var(--color-surface-2); color: var(--text-secondary); }
.student-email-change .student-email-change__hint { margin: 0; padding: 10px 12px; border-radius: 10px; background: var(--color-surface-2); color: var(--color-text); overflow-wrap: anywhere; }
.student-email-change .student-auth-error { color: var(--color-text); }
.student-email-change .btn { min-height: 44px; white-space: normal; }
.student-email-change [hidden] { display: none !important; }
.student-email-change-success { position: fixed; z-index: 10010; top: 12px; left: 50%; transform: translateX(-50%); box-sizing: border-box; width: min(620px, calc(100vw - 24px)); padding: 12px 16px; border: 1px solid var(--color-accent); border-radius: 14px; background: var(--color-surface); color: var(--color-text); box-shadow: var(--shadow-sm); }
.student-email-change-success p { margin: 0 0 8px; font-size: .9rem; line-height: 1.45; }