body {
  margin: 0;
  background: black;
  color: white;
  font-family: 'Comic Sans MS', cursive, sans-serif;
  overflow-y: auto;
}



nav#sidebar {
  z-index: 10;
  position: fixed;
  left: 0;
  top: 0;
  width: 10vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 2rem;
  background: transparent;
  margin-left: 0.7rem;
 

}



nav#sidebar a {
  margin: 1rem 0;
  color: yellow;
  text-decoration: none;
  font-weight: bold;
  font-size: 0.7rem;
  padding: 0.3rem 0.3rem; /* ✅ 给内部加 padding，方便边框环绕 */
  transition: transform 0.3s, text-shadow 0.3s, border 0.3s;
  text-shadow: 1px 1px 0 black, -1px 1px 0 black, 1px -1px 0 black, -1px -1px 0 black;
  border: 2px solid transparent; /* 初始无边框 */
  border-radius: 8px;
}


nav#sidebar a:hover {
  transform: scale(1.5);
  text-shadow: 0 0 30px pink;
}


nav#sidebar a.active {
  border-color: purple;  /* 紫色边框 */
  transform: scale(1.4);
  text-shadow: 0 0 20px purple;
}

.sparkle {
  position: fixed;
  width: 2px;
  height: 2px;
  background: white;
  border-radius: 50%;
  animation: sparkle 2s infinite ease-in-out;
  opacity: 0.7;
  pointer-events: none;
  z-index: 3;
}

@keyframes sparkle {
  0%, 100% { opacity: 0.2; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.5); }
}

 /* 
.content {
  margin-left: 180px;
  padding: 2rem;
}
*/


   /* Responsive container */
    .content {
      margin: 2rem auto;
      padding: 1rem;
      max-width: 1100px;
      color: white;
    }

    h1 {
      font-size: 1.8rem;
      margin-bottom: 1rem;
      color: yellow;
    }

    p {
      font-size: 1.rem;
      line-height: 1.6;
      margin-top: 1rem;
      color: purple;
      font-weight: bold;
    }

    .video-container {
      position: relative;
      padding-bottom: 56.25%; /* 16:9 */
      padding-top: 25px;
      height: 0;
      margin-top: 2rem;
    }

    .video-container iframe {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      border: none;
    }

    .video-description {
      margin-top: 0.5rem;
      font-size: 0.9rem;
      color: #ccc;
    }

    @media screen and (max-width: 768px) {
      .content {
        padding: 1rem;
        margin-left: 2.8rem;
      }
    }