body {
  background-color: #f9f9f9;
  font-family: "Segoe UI", Arial, sans-serif;
}

.hero {
  background-color: #ffffff;
  padding: 3rem 1rem;
}

.section {
  padding: 3rem 1.5rem;
}

.is-gray {
  background-color: #f0f0f0;
}

.is-white {
  background-color: #ffffff;
}

.content {
  font-size: 1.1rem;
}

.abstract-text {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1.1rem;
  line-height: 1.7;
  text-align: left;
}

.sample-card {
  background-color: white;
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  margin: auto;
  margin-top: 2rem;
  max-width: 100%;
}

.sample-card .content-left {
  text-align: left;
}

audio {
  width: 100%;
  margin: 0.5rem 0 1rem 0;
}

.label {
  font-weight: bold;
  margin-top: 1rem;
}

.placeholder-img {
  background-color: #e0e0e0;
  width: 100%;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #888;
  font-size: 1.5rem;
  margin-top: 1rem;
  border-radius: 4px;
}

h2.title,
h4.title {
  text-align: center;
}

#indicator-dots span {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin: 0 5px;
  border-radius: 50%;
  background-color: #bbb;
}

#indicator-dots .active {
  background-color: #333;
}