html {
  scroll-behavior: smooth;
}
body {
  font-family: "Noto Sans SC", sans-serif;
  background-color: #fdfbf6;
  color: #3c3c3c;
}
.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  text-align: center;
}
.section-subtitle {
  font-size: 1.125rem;
  font-weight: 300;
  color: #7a7a7a;
  margin-bottom: 3rem;
  text-align: center;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.tab-btn {
  transition: all 0.3s ease;
}
.tab-btn.active {
  background-color: #8a817c;
  color: #fdfbf6;
  border-color: #8a817c;
}
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}
.loader {
  border: 4px solid #f3f3f3;
  border-top: 4px solid #8a817c;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
}
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Loading Animation */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #fdfbf6;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 0.5s ease-out;
}

.loading-screen.fade-out {
  opacity: 0;
  pointer-events: none;
}

.loading-logo {
  width: 240px;
  height: 240px;
  margin-bottom: 2rem;
  animation: pulse 2s infinite;
}

.loading-text {
  font-size: 1。5rem;
  color: #3c3c3c;
  font-weight: 700;
  margin-top: 3rem;
}

@keyframes pulse {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.8;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}