body {
  background: linear-gradient(135deg, #eaf3ff 0%, #f7fbff 100%);
  min-height: 100vh;
}

.mobile-shell {
  max-width: 480px;
  margin: 0 auto;
  padding: 0 1rem 4.5rem;
}

.card {
  border: none;
  border-radius: 20px;
  box-shadow: 0 16px 35px rgba(47, 128, 237, 0.15);
}

.btn-lg {
  padding: 1rem 1.25rem;
  border-radius: 999px;
  font-weight: 600;
}

.info-box {
  background: rgba(255, 255, 255, 0.75);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: 0 10px 22px rgba(86, 204, 242, 0.15);
}

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-around;
  background: rgba(248, 251, 255, 0.95);
  backdrop-filter: blur(10px);
  border-top: 1px solid rgba(47, 128, 237, 0.15);
  padding: 0.6rem 0.2rem 0.8rem;
  z-index: 999;
}

.bottom-nav::before {
  content: "";
  position: absolute;
  top: -1.2rem;
  left: 50%;
  transform: translateX(-50%);
  width: 40%;
  height: 0.25rem;
  background: linear-gradient(90deg, rgba(86, 204, 242, 0.6), rgba(47, 128, 237, 0.6));
  border-radius: 999px;
}

.bottom-nav-link {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 0.85rem;
  text-decoration: none;
  color: #4f5d75;
  gap: 0.15rem;
  padding: 0 0.6rem;
}

.bottom-nav-link .material-symbols-outlined {
  font-size: 1.7rem;
  line-height: 1;
}

.bottom-nav-link.active {
  color: #2F80ED;
  font-weight: 600;
}

.bottom-nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -0.3rem;
  left: 50%;
  transform: translateX(-50%);
  width: 1.6rem;
  height: 0.18rem;
  background: #2F80ED;
  border-radius: 999px;
}

@media (min-width: 768px) {
  .mobile-shell {
    max-width: 420px;
  }
}