body {
  background-color: #f5f7fa;
}

.student-photo {
  width: 96px;
  height: 128px;
  object-fit: cover;
}

.thumb {
  width: 48px;
  height: 64px;
  object-fit: cover;
}

.photo-preview {
  max-width: 100%;
  max-height: 220px;
  display: block;
}

.card {
  border: none;
}

.table > :not(caption) > * > * {
  padding: 0.45rem 0.5rem;
}

.setting-card {
  border: 1px solid #e3e6ea;
  border-radius: 0.6rem;
  background: #fff;
  text-align: left;
  padding: 0;
  width: 100%;
  transition: box-shadow 0.15s ease, transform 0.15s ease, border-color 0.15s ease;
}

.setting-card:hover {
  box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
  border-color: #0d6efd;
}

.setting-icon {
  width: 52px;
  height: 52px;
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.6rem;
  background: rgba(13, 110, 253, 0.1);
  color: #0d6efd;
  font-size: 1.6rem;
}

.admin-navbar {
  background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
}

.admin-navbar .navbar-brand {
  font-weight: 600;
  letter-spacing: 0.5px;
}

.admin-navbar .nav-link {
  color: rgba(255, 255, 255, 0.85);
  border-radius: 0.5rem;
  padding: 0.4rem 0.8rem;
  margin: 0 0.1rem;
  transition: background 0.15s ease, color 0.15s ease;
}

.admin-navbar .nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.15);
}

.admin-navbar .nav-link.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.28);
  font-weight: 600;
}