:root {
  --primary-color: #0d6efd;
  --primary-dark: #0b5ed7;
  --success-color: #198754;
  --warning-color: #ffc107;
  --danger-color: #dc3545;
  --info-color: #0dcaf0;
  --light-bg: #f8f9fa;
  --dark-bg: #212529;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding-top: 76px;
}

.navbar {
  backdrop-filter: blur(10px);
  background: rgba(13, 110, 253, 0.95) !important;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
  font-size: 1.5rem;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-section {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  padding: 3rem 2rem;
  margin-bottom: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.hero-section h1 {
  background: linear-gradient(45deg, var(--primary-color), #764ba2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
}

.card {
  border-radius: 15px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.card-header {
  border-bottom: none;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  padding: 1.5rem;
}

.btn {
  border-radius: 10px;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  box-shadow: 0 4px 15px rgba(13, 110, 253, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(13, 110, 253, 0.4);
}

.btn-outline-primary {
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
  background: transparent;
}

.btn-outline-primary:hover,
.btn-outline-primary:focus,
.btn-outline-primary.active,
.btn-check:checked + .btn-outline-primary {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
  transform: translateY(-1px);
}

.form-control {
  border-radius: 10px;
  border: 2px solid #e9ecef;
  padding: 0.75rem 1rem;
  transition: all 0.3s ease;
}

.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
  transform: translateY(-1px);
}

.form-label {
  color: #495057;
  margin-bottom: 0.75rem;
}

.input-group .btn {
  border-radius: 0 10px 10px 0;
}

.input-group .form-control {
  border-radius: 10px 0 0 10px;
}

.alert {
  border-radius: 10px;
  border: none;
  padding: 1rem 1.5rem;
}

.border-success {
  border: 2px solid var(--success-color) !important;
}

.bg-success {
  background: linear-gradient(135deg, var(--success-color), #157347) !important;
}

.text-primary {
  color: var(--primary-color) !important;
}

.feature-card {
  transition: transform 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-10px);
}

footer {
  background: var(--dark-bg) !important;
  margin-top: 4rem;
}

/* Language Selector */
.language-selector {
  position: relative;
}

.language-selector .dropdown-toggle {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: white;
  border-radius: 8px;
  padding: 0.5rem 1rem;
}

.language-selector .dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(255, 255, 255, 0.25);
}

.language-selector .dropdown-menu {
  border-radius: 10px;
  border: none;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* Loading Animation */
.btn.loading {
  position: relative;
  color: transparent;
}

.btn.loading:after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border-radius: 50%;
  border: 2px solid transparent;
  border-top-color: #ffffff;
  animation: button-loading-spinner 1s ease infinite;
}

@keyframes button-loading-spinner {
  from {
    transform: rotate(0turn);
  }
  to {
    transform: rotate(1turn);
  }
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .hero-section {
    padding: 2rem 1rem;
  }

  .hero-section h1 {
    font-size: 2.5rem;
  }

  .card-body {
    padding: 1.5rem;
  }

  .btn-group .btn {
    font-size: 0.9rem;
    padding: 0.6rem 1rem;
  }
}