html {
  font-size: 16px;
  height: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: #f5f5f5;
  overflow-x: hidden;
}

.app-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: #f5f5f5;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.app-container {
  flex: 1;
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
  padding: 0;
}

.app-main {
  padding: 1rem;
  padding-bottom: 2rem;
}

/* Mobile-first card styling */
.card {
  border: none;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  margin-bottom: 1rem;
}

.card-body {
  padding: 1.5rem;
}

/* Button styling for app feel */
.btn {
  border-radius: 8px;
  font-weight: 500;
  padding: 0.75rem 1.5rem;
  transition: all 0.2s;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border: none;
  box-shadow: 0 4px 6px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 12px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
  background-color: #6c757d;
  border: none;
}

/* Form controls */
.form-control {
  border-radius: 8px;
  border: 1px solid #ddd;
  padding: 0.75rem;
  font-size: 1rem;
}

.form-control:focus {
  border-color: #667eea;
  box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

/* Navbar styling */
.navbar {
  padding: 0.75rem 1rem;
}

.navbar-brand {
  font-size: 1.25rem;
  font-weight: 600;
}

.nav-link {
  padding: 0.5rem 1rem !important;
  font-weight: 500;
}

.nav-link i {
  margin-right: 0.5rem;
}

/* Alert styling */
.alert {
  border-radius: 8px;
  border: none;
  padding: 1rem;
}

.alert-warning {
  background-color: #fff3cd;
  color: #856404;
}

.alert-danger {
  background-color: #f8d7da;
  color: #721c24;
}

.alert-info {
  background-color: #d1ecf1;
  color: #0c5460;
}

/* Remove footer */
.footer {
  display: none;
}

/* Mobile optimizations */
@media (max-width: 768px) {
  .app-main {
    padding: 0.75rem;
  }
  
  .card-body {
    padding: 1rem;
  }
  
  .container {
    padding-left: 0.5rem;
    padding-right: 0.5rem;
  }
}

/* Prevent text selection on buttons */
.btn {
  user-select: none;
  -webkit-user-select: none;
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Loading states */
.loading {
  opacity: 0.6;
  pointer-events: none;
}