html,
body {
  font-family: "Inter", sans-serif;
  background-color: #121212;
  color: #e0e0e0;
  margin: 0;
  padding: 0;
}

.page-title {
  font-size: 2.5em;
  margin-bottom: 0.5em;
  color: #ffffff;
  text-align: center;
}

.page-subtitle {
  font-size: 1.25em;
  font-weight: 400;
  text-align: center;
  max-width: 720px;
  margin: 0 auto 2em auto;
  color: #cccccc;
}

a {
  color: #90caf9;
  text-decoration: none;
}

@media (min-width: 768px) {
  .container {
    width: 100%;
    max-width: 840px;
    padding: 1em;
    margin: 0 auto;
  }
}

.collapsible-section {
  background: #1e1e1e;
  margin-bottom: 1em;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.collapsible-section h5 {
  font-size: 1.2em;
  font-weight: 600;
  margin: 0;
  padding: 1em;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #2a2a2a;
  cursor: pointer;
  color: #ffffff;
  transition: background 0.2s ease;
}
.collapsible-section h5:hover {
  background: #333333;
}

.toggle-btn {
  background: #444;
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  font-size: 1.2em;
  transition: transform 0.2s ease;
}
.toggle-btn.open {
  transform: rotate(45deg);
}

.content {
  padding: 1em 1.5em;
  display: none;
  font-size: 1em;
  color: #bbbbbb;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .container {
    padding: 1em;
  }

  .collapsible-section {
    margin-bottom: 1em;
  }
}