body {
  margin: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f4f6fa;
  color: #222;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

main {
  width: 100vw;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#ui-development {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
}

#circular-menu-container {
  position: relative;
  width: 400px;
  height: 400px;
  max-width: 90vw;
  max-height: 90vw;
  margin: 2rem auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (max-width: 500px) {
  #circular-menu-container {
    width: 90vw;
    height: 90vw;
  }
}

/* Circular menu SVG styles */
.circular-menu-svg {
  width: 100%;
  height: 100%;
  display: block;
  outline: none;
}

.start-btn {
  cursor: pointer;
  filter: drop-shadow(0 2px 8px rgba(59,130,246,0.15));
  transition: r 0.4s cubic-bezier(.4,2,.6,1), filter 0.3s;
}
.start-btn:focus, .start-btn:hover {
  filter: drop-shadow(0 4px 16px rgba(59,130,246,0.25));
  outline: 2px solid #2563eb;
  outline-offset: 2px;
}

.sector {
  cursor: pointer;
  opacity: 0.85;
  transition: transform 0.4s cubic-bezier(.4,2,.6,1), opacity 0.3s;
}
.sector:focus, .sector:hover {
  opacity: 1;
  filter: brightness(1.1) drop-shadow(0 2px 8px rgba(0,0,0,0.08));
  outline: 2px solid #fff;
  outline-offset: 2px;
}

.subset {
  cursor: pointer;
  opacity: 0.92;
  transition: transform 0.4s cubic-bezier(.4,2,.6,1), opacity 0.3s;
}
.subset:focus, .subset:hover {
  opacity: 1;
  filter: brightness(1.15) drop-shadow(0 2px 8px rgba(0,0,0,0.10));
  outline: 2px solid #fff;
  outline-offset: 2px;
}

/* Text labels */
.start-btn-label {
  pointer-events: none;
  user-select: none;
  font-weight: 600;
  letter-spacing: 0.05em;
}

svg text {
  font-family: 'Segoe UI', Arial, sans-serif;
  font-weight: 500;
  user-select: none;
}

/* Responsive tweaks */
@media (max-width: 500px) {
  .circular-menu-svg {
    width: 100vw;
    height: 100vw;
  }
}