body {
  margin: 0;
  font-family: "Segoe UI", Arial, "Helvetica Neue", Helvetica, sans-serif;
  background: linear-gradient(180deg, #eff6ff, #f8fbff);
  color: #0f172a;
}

.admin-layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
}

.admin-hero,
.admin-card,
.stat-card {
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(255,255,255,0.8);
  border-radius: 24px;
  box-shadow: 0 18px 40px rgba(15,23,42,0.08);
}

.admin-hero {
  padding: 24px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.admin-eyebrow { margin: 0 0 8px; color: #2563eb; font-weight: 800; text-transform: uppercase; font-size: 12px; letter-spacing: .08em; }
.admin-subtext { color: #475569; max-width: 720px; line-height: 1.6; }
.ghost-link { color: #1d4ed8; text-decoration: none; font-weight: 700; }

.admin-card { padding: 20px; margin-bottom: 18px; }
.admin-section-title { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; margin-bottom: 16px; }
.admin-section-title span { color: #64748b; font-size: 14px; }

.auth-form { display: grid; gap: 14px; }
label { display: flex; flex-direction: column; gap: 8px; font-weight: 600; color: #334155; }
input, button { font: inherit; }
input {
  width: 100%; padding: 13px 15px; border-radius: 16px; border: 1px solid #cbd5e1; background: #fff;
}
button {
  min-height: 46px; padding: 0 16px; border-radius: 14px; border: none;
  background: linear-gradient(135deg, #2563eb, #1d4ed8); color: #fff; font-weight: 700; cursor: pointer;
}
.secondary-button { background: #e2e8f0; color: #0f172a; box-shadow: none; }
.auth-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.admin-message { min-height: 20px; font-weight: 600; }
.hidden { display: none !important; }

.admin-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 14px;
  margin-bottom: 18px;
}
.stat-card { padding: 18px; }
.stat-label { display: block; color: #64748b; font-size: 13px; text-transform: uppercase; letter-spacing: .04em; }
.stat-card strong { display: block; margin-top: 8px; font-size: 28px; }

.admin-history-list { display: grid; gap: 14px; }
.admin-history-item {
  border: 1px solid #dbe5f4; border-radius: 20px; padding: 16px; background: linear-gradient(180deg, #fff, #f8fbff);
}
.admin-history-top { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; margin-bottom: 12px; }
.admin-history-student { font-size: 18px; font-weight: 800; }
.admin-history-meta { color: #64748b; font-size: 13px; margin-top: 4px; }
.admin-badge { padding: 8px 12px; border-radius: 999px; font-size: 12px; font-weight: 800; }
.admin-badge.changed { background: #dbeafe; color: #1d4ed8; }
.admin-badge.confirmed { background: #dcfce7; color: #15803d; }
.admin-changes { display: grid; gap: 10px; }
.admin-change-row { border: 1px solid #e2e8f0; border-radius: 16px; padding: 12px 14px; background: #f8fbff; }
.admin-field-name { font-size: 13px; font-weight: 700; color: #334155; margin-bottom: 6px; text-transform: uppercase; }
.admin-values { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.admin-old, .admin-new { padding: 6px 10px; border-radius: 999px; font-size: 13px; font-weight: 700; }
.admin-old { background: #fee2e2; color: #b91c1c; }
.admin-new { background: #dcfce7; color: #15803d; }
.admin-arrow { color: #64748b; font-weight: 800; }
.admin-confirm-box { border-radius: 16px; padding: 14px; background: linear-gradient(135deg, #dcfce7, #ecfdf5); color: #166534; border: 1px solid #bbf7d0; font-weight: 600; }
.admin-note { margin-top: 12px; padding-top: 10px; border-top: 1px dashed #cbd5e1; }
.admin-note-label { display: inline-block; margin-bottom: 6px; color: #64748b; font-size: 12px; font-weight: 800; text-transform: uppercase; }
.admin-item-actions { margin-top: 12px; display: flex; justify-content: flex-end; }

@media (max-width: 760px) {
  .admin-layout { padding: 14px; }
  .admin-hero, .admin-card, .stat-card { border-radius: 20px; padding: 16px; }
  .admin-hero, .admin-section-title, .admin-history-top, .auth-actions { flex-direction: column; align-items: stretch; }
  .admin-stats { grid-template-columns: 1fr; }
  .admin-item-actions button { width: 100%; }
}