:root {
  --primary-color: #0078D4;
  --secondary-color: #2B88D8;
  --accent-color: #0063B1;
  --background-color: #F5F5F5;
  --text-color: #333333;
  --border-color: #DDDDDD;
  --success-color: #4CAF50;
  --warning-color: #FF9800;
  --error-color: #F44336;
  --info-color: #2196F3;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', 'Inter', sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.5;
}

.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  background-color: var(--primary-color);
  color: white;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.logo {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  color: white;
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 500;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-right: 1rem;
}

.nav-link {
  color: white;
  text-decoration: none;
  font-size: 0.9rem;
  opacity: 0.9;
  transition: opacity 0.2s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-link:hover {
  opacity: 1;
}

.nav-link.active {
  opacity: 1;
  font-weight: 500;
}

.language-select {
  background-color: rgba(255, 255, 255, 0.1);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 0.5rem;
  border-radius: 4px;
  font-size: 0.875rem;
}

.header-button {
  background-color: rgba(255, 255, 255, 0.2);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-size: 0.875rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: background-color 0.2s;
}

.header-button:hover {
  background-color: rgba(255, 255, 255, 0.3);
}

.panel {
  background-color: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.panel-header h2 {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--primary-color);
}

.panel-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.panel-button {
  background-color: transparent;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.panel-button:hover {
  background-color: rgba(0, 120, 212, 0.05);
}

.panel-content {
  flex: 1;
}

.button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.button.secondary {
  background-color: transparent;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
}

footer {
  background-color: #333;
  color: white;
  padding: 1rem;
  text-align: center;
  font-size: 0.875rem;
}

/* Mobile menu */
.mobile-menu-button {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--primary-color);
  z-index: 1000;
  flex-direction: column;
  padding: 2rem;
}

.mobile-menu-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.mobile-menu-close {
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
}

.mobile-menu-links {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.mobile-menu-link {
  color: white;
  text-decoration: none;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .mobile-menu-button {
    display: block;
  }
  
  .mobile-menu.open {
    display: flex;
  }
}