.cover-container {
  text-align: center;
  background-color: var(--container-bg);
  padding: 40px;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--box-shadow);
  max-width: 600px;
  animation: fadeIn 2s ease-in;
}

.cover-container ::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--tertiary-color));
  border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
}

.cover-image {
  width: 100%;
  max-height: 400px;
  object-fit: contain;
  border-radius: 24px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  animation: float 3s ease-in;
  background-color: var(--primary-color);
  border-radius: var(--border-radius-lg);
}

.subtitle {
  font-size: 1.4rem;
  color: #444;
  margin-bottom: 30px;
  animation: fadeIn 4s ease-in;
}
.start-button, .menu-button {
  background-color: var(--primary-color);
  color: #fff;
  padding: 14px 28px;
  font-size: 1.1rem;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  transition: background-color 0.3s ease;
  animation: fadeIn 5s ease-in;
  margin: 10px;
}
.start-button:hover, .menu-button:hover {
  background-color: var(--secondary-color);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.chapter-links {
  margin-top: 40px;
  background-color: #fff4e6;
  padding: 20px;
  border-radius: 24px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.1);
  animation: fadeIn 3s ease-in;
}

.chapter-links h2 {
  font-size: 1.6rem;
  color: #ff6f91;
  margin-bottom: 20px;
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.chapter-card {
  background-color: #ffe0ec;
  padding: 14px;
  border-radius: 18px;
  text-align: center;
  font-weight: bold;
  text-decoration: none;
  color: #d63384;
  font-size: 1rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transition: transform 0.2s, background-color 0.3s;
}

.chapter-card:hover {
  transform: scale(1.05);
  background-color: #ffd6e8;
}