* {
  box-sizing: border-box;
}
body {
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(145deg, #001f4d, #003366);
  color: #fff;
  margin: 0;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}
h1, h5 {
  text-align: center;
  margin: 0.5rem 0;
  text-shadow: 1px 1px 5px #0009;
}
h1 {
  font-size: 2rem;
  font-weight: bold;
}
h5 {
  font-size: 0.95rem;
  color: #ccc;
}

.section {
  width: 100%;
  max-width: 400px;
  margin-bottom: 1.5rem;
}

.btn {
  border: none;
  border-radius: 10px;
  padding: 12px;
  margin: 5px 0;
  width: 100%;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  box-shadow: 0 4px 8px #00000040;
  transition: 0.2s;
  display: block;
  text-align: center;
  text-decoration: none;
}
.btn:hover {
  transform: scale(1.02);
  opacity: 0.9;
}

.admin-btn { background: #0059b3; }
.login-btn { background: #009688; }
.logout-btn { background: #e53935; }

.band-btns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.band-btn {
  padding: 12px;
  border-radius: 10px;
  font-weight: bold;
  font-size: 1rem;
  color: white;
  text-align: center;
  text-decoration: none;
}

.band3 { background: #2e7d32; }
.band28 { background: #fbc02d; color: #222; }
.band40 { background: #424242; }
.band41 { background: #8e24aa; }

.imei-box {
  background: #002244cc;
  padding: 1rem;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 0 10px #0009;
}

.imei-box input {
  width: 100%;
  padding: 12px;
  margin-bottom: 0.7rem;
  font-size: 1rem;
  border-radius: 8px;
  border: none;
  background: #e1e8ff1a;
  color: white;
  font-family: monospace;
  text-align: center;
}

.imei-box button {
  background: #0059b3;
  color: white;
  border: none;
  border-radius: 8px;
  padding: 12px;
  font-size: 1rem;
  font-weight: bold;
  width: 100%;
  cursor: pointer;
}

.copy-container {
  font-size: 0.9rem;
  color: #ccc;
  margin-top: 0.5rem;
}

.search-box input {
  width: 100%;
  padding: 10px;
  font-size: 1rem;
  border-radius: 8px;
  border: none;
  margin-bottom: 10px;
}

footer {
  text-align: center;
  font-size: 0.8rem;
  color: #aaa;
  margin-top: auto;
}

footer a {
  color: #90caf9;
  text-decoration: none;
}
footer a:hover {
  text-decoration: underline;
}

.about-btn, .contact-btn {
  background: #607d8b;
  color: white;
}

.social-btn {
  background: #4267B2;
}

@media (max-width: 480px) {
  h1 { font-size: 1.6rem; }
  .btn, .band-btn { font-size: 1rem; }
}