.main-content {
  padding: 2rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 700px;
  margin-left: 2rem;
  margin-top: 2rem;
  backdrop-filter: blur(2px);
}
.main-content h1 {
  font-size: 2.2rem;
  font-weight: 600;
  background: linear-gradient(135deg, #ffd89b, #ffb347);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  margin-bottom: 1rem;
}
.main-content p {
  background: rgba(0, 0, 0, 0.4);
  padding: 1.2rem 1.5rem;
  border-radius: 32px;
  line-height: 1.6;
  border-left: 4px solid #ffb347;
}
.info-badge {
  position: fixed;
  bottom: 20px;
  right: 20px;
  font-size: 11px;
  background: rgba(0, 0, 0, 0.5);
  padding: 5px 12px;
  border-radius: 50px;
  color: #aaa;
  pointer-events: none;
  z-index: 99;
  backdrop-filter: blur(5px);
}

.quarter-circle-wrapper {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 200px;
  height: 200px;
  z-index: 1000;
  pointer-events: none; 
}
.quarter-circle-wrapper img{
    top: 50%;
    left: 50%;
    transform: translate(-59%, -19%) scale(1.15);
}
.arc-canvas {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none; 
}

.arc-buttons-layer {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: auto;

}

.nav-item {
  position: absolute;
  cursor: pointer;
  list-style: none;
  z-index: 1100;
  transform: translate(-50%, -50%); 
  transition: transform 0.2s cubic-bezier(0.2, 0.9, 0.4, 1.1);
}
.letter-btn {
  width: 40px;
  height: 40px;
  line-height: 48px;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: #000;
  transition: all 0.25s ease;
  border: 1.5px solid rgba(255, 255, 255, 0.7);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  background-image: url(https://omo-oss-image.thefastimg.com/portal-saas/pg2025082511212601933/cms/image/40640507-7a6b-4fa9-a284-5e50d9ac9422.png);
    background-repeat: no-repeat;
  background-position: center center;
}

.nav-item:hover {
  transform: translate(-50%, -50%) scale(1.08);
  z-index: 1110;
}
.nav-item:hover .letter-btn {
  background: rgba(255, 255, 255, 0.8);
  color: #000;
  border-color: rgba(255, 255, 255, 0.8);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
  background-image: url(https://omo-oss-image.thefastimg.com/portal-saas/pg2025082511212601933/cms/image/e9c99c93-50bf-4cdc-98b7-4cf8bf24f1dc.png);
      background-repeat: no-repeat;
  background-position: center center;
}

.expand-panel {
  position: fixed;
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(10px);
  border-radius: 10px;
  padding: 12px 10px;
  min-width: 240px;
  max-width: 320px;
  z-index: 1300;
  transition: opacity 0.2s ease, transform 0.2s cubic-bezier(0.2, 0.9, 0.4, 1.1);
  opacity: 0;
  transform: translateX(0px) scale(1);
  pointer-events: none;
}
.expand-panel.active {
  opacity: 1;
  transform: translateX(0) scale(1);
  pointer-events: auto;
}
.panel-link-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.panel-header {
  padding: 4px 12px 8px;
  font-size: 0.75rem;
  color: #ffb85e;
  letter-spacing: 1px;
  border-bottom: 1px dashed rgba(255, 200, 120, 0.4);
  margin-bottom: 6px;
  font-weight: 600;
  display: none;
}
.panel-link-list a {
  display: block;
  padding: 8px 14px;
  font-size: 0.88rem;
  font-weight: 500;
  color: #000;
  text-decoration: none;
  border-radius: 18px;
  transition: all 0.2s;
  border-left: 2px solid transparent;
}
.panel-link-list a:hover {
  color: #000;
}
.panel-link-list a::before {
  content: ">";
  margin-right: 8px;
  font-size: 0.8rem;
  opacity: 0.8;
}

.expand-panel {
  max-height: 330px;
  overflow-y: auto;
}
.expand-panel::-webkit-scrollbar {
  width: 4px;
}
.expand-panel::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 10px;
}
.expand-panel::-webkit-scrollbar-thumb {
  background: #ff7b2c;
  border-radius: 10px;
}

@media (max-width: 550px) {
  .quarter-circle-wrapper {
    width: 170px;
    height: 170px;
  }
  .letter-btn {
    width: 42px;
    height: 42px;
    font-size: 1.4rem;
  }
  .expand-panel {
    min-width: 165px;
    max-width: 210px;
  }
  .panel-link-list a {
    font-size: 0.8rem;
    padding: 6px 12px;
  }
}