/* Light theme with stealthy button and heading */
.app-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.app-header {
  text-align: center;
  margin-bottom: 40px;
  padding: 30px 20px;
  background: linear-gradient(135deg, #718096 0%, #4a5568 50%, #2d3748 100%);
  color: #e2e8f0;
  border-radius: 12px;
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.3),
    0 0 0 1px rgba(113, 128, 150, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.15);
  border: 1px solid #718096;
  position: relative;
  overflow: hidden;
}

.app-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, #a0aec0, transparent);
  opacity: 0.8;
}

.app-header h1 {
  margin: 0 0 10px 0;
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #ffffff 0%, #f7fafc 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 20px rgba(255, 255, 255, 0.4);
}

.app-header p {
  margin: 0;
  font-size: 1.1rem;
  opacity: 0.9;
  color: #e2e8f0;
  font-weight: 400;
}

.app-main {
  display: grid;
  gap: 40px;
}

.dashboard-section,
.modal-section {
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  border: 1px solid #e1e5e9;
}

.dashboard-section h2,
.modal-section h2 {
  margin: 0 0 20px 0;
  color: #2c3e50;
  font-size: 1.5rem;
  font-weight: 600;
}

.modal-section p {
  color: #7f8c8d;
  margin-bottom: 20px;
  font-size: 1rem;
}

.toggle-button {
  background: linear-gradient(135deg, #4a5568 0%, #2d3748 100%);
  color: #e2e8f0;
  border: 1px solid #4a5568;
  padding: 15px 30px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow:
    0 4px 16px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  position: relative;
  overflow: hidden;
  font-family: inherit;
}

.toggle-button::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(160, 174, 192, 0.3),
    transparent
  );
  transition: left 0.5s ease;
}

.toggle-button:hover::before {
  left: 100%;
}

.toggle-button:hover {
  transform: translateY(-2px);
  box-shadow:
    0 8px 25px rgba(0, 0, 0, 0.3),
    0 0 0 1px rgba(160, 174, 192, 0.6),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  border-color: #a0aec0;
  color: #f7fafc;
  background: linear-gradient(135deg, #718096 0%, #4a5568 100%);
}

.toggle-button.active {
  background: linear-gradient(135deg, #e53e3e 0%, #c53030 100%);
  border-color: #fc8181;
  box-shadow:
    0 4px 16px rgba(229, 62, 62, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

.toggle-button.active::before {
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
}

.toggle-button.active:hover {
  box-shadow:
    0 8px 25px rgba(229, 62, 62, 0.4),
    0 0 0 1px rgba(229, 62, 62, 0.8),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  border-color: #feb2b2;
}

/* Responsive design */
@media (max-width: 768px) {
  .app-container {
    padding: 15px;
  }

  .app-header {
    padding: 20px 15px;
  }

  .app-header h1 {
    font-size: 2rem;
  }

  .dashboard-section,
  .modal-section {
    padding: 20px;
  }

  .toggle-button {
    width: 100%;
    padding: 18px;
  }
}