body {
  font-family: 'Segoe UI', 'Roboto', Arial, sans-serif;
  background: linear-gradient(120deg, #141e30 0%, #243b55 100%);
  color: #f5faff;
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
}

.navbar {
  background: rgba(20, 30, 48, 0.98) !important;
  box-shadow: 0 2px 12px rgba(0,0,0,0.18);
  backdrop-filter: blur(10px);
}

.navbar-brand {
  font-weight: bold;
  color: #00bcd4 !important;
  letter-spacing: 1px;
  font-size: 1.3rem;
  transition: color 0.3s;
}

.navbar-brand:hover {
  color: #38a169 !important;
}

.container {
  max-width: 900px;
  background: rgba(31, 46, 74, 0.97);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
  padding: 40px 30px;
  margin-top: 40px;
  animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

h1 {
  color: #00bcd4;
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 24px;
  text-shadow: 0 2px 4px rgba(0,188,212,0.3);
  position: relative;
}

h1::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, #00bcd4, #38a169);
  border-radius: 2px;
}

h3 {
  color: #38a169;
  margin-top: 32px;
  margin-bottom: 12px;
  font-weight: 600;
  position: relative;
  padding-left: 20px;
}

h3::before {
  content: '🔒';
  position: absolute;
  left: 0;
  top: 0;
  font-size: 1.2rem;
}

p.lead {
  font-size: 1.2rem;
  color: #e0f7fa;
  margin-bottom: 18px;
  font-style: italic;
  border-left: 4px solid #00bcd4;
  padding-left: 15px;
}

p, li {
  color: #f5faff;
  font-size: 1rem;
  line-height: 1.7;
  transition: color 0.3s;
}

p:hover, li:hover {
  color: #b2ebf2;
}

ul {
  margin-left: 20px;
  margin-bottom: 18px;
}

ul li {
  margin-bottom: 8px;
  color: #b2ebf2;
  list-style-type: disc;
}

hr {
  border-top: 2px solid #00bcd4;
  margin: 30px 0;
  opacity: 0.5;
}

.alert-info {
  background: linear-gradient(90deg, #00bcd4 0%, #38a169 100%);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-weight: 500;
  box-shadow: 0 2px 12px rgba(0,188,212,0.15);
  animation: slideIn 0.6s ease-out;
}

@keyframes slideIn {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.btn-secondary {
  background-color: #00bcd4;
  border: none;
  color: #fff;
  font-weight: 600;
  border-radius: 6px;
  padding: 10px 24px;
  transition: all 0.3s;
  box-shadow: 0 4px 8px rgba(0,188,212,0.2);
}

.btn-secondary:hover {
  background-color: #0097a7;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0,188,212,0.3);
}

footer {
  background: #141e30;
  color: #b0bec5;
  font-size: 1rem;
  border-radius: 0 0 12px 12px;
  margin-top: 40px;
  box-shadow: 0 -2px 12px rgba(0,0,0,0.12);
  padding: 18px 0;
  text-align: center;
}

@media (max-width: 600px) {
  .container {
    padding: 18px 8px;
    margin-top: 18px;
  }
  h1 {
    font-size: 1.5rem;
  }
  h3 {
    font-size: 1.1rem;
    padding-left: 15px;
  }
  h3::before {
    font-size: 1rem;
  }
  .btn-secondary {
    padding: 8px 16px;
    font-size: 0.95rem;
  }
}