html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: sans-serif;
  background-color: #f4f4f4;
  line-height: 1.6;
}

header {
  background: #003366;
  color: white;
  padding: 1rem;
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 1000;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

nav li {
  margin: 0 1rem;
}

nav a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
}

main {
  padding: 2rem;
}

section {
  background: white;
  margin-bottom: 2rem;
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  scroll-margin-top: 80px; /* 解決錨點被 header 擋住的問題 */
}

.content-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.text-block {
  flex: 1;
}

.content-img {
  max-width: 20%;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.video-frame {
  width: 100%;
  max-width: 400px;
  aspect-ratio: 16 / 9;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

@media (max-width: 768px) {
  .content-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .content-img,
  .video-frame {
    max-width: 80%;
    align-self: center;
  }

  nav ul {
    flex-direction: column;
    align-items: center;
  }

  nav li {
    margin: 0.5rem 0;
  }

  main {
    padding: 1rem;
  }
}

footer {
  background: #003366;
  color: white;
  text-align: center;
  padding: 1rem;
}

#game {
  scroll-margin-top: 80px;
}

.game-container {
  text-align: center;
  padding: 2rem 1rem;
}

#bugGame {
  background-color: #eeeeee;
  border: 2px solid #444;
  border-radius: 6px;
  margin: 1rem auto 0 auto;  /* ⬅️ 關鍵：左右自動置中 */
  width: 100%;
  max-width: 600px;
  display: block;            /* 確保 canvas 以區塊元素呈現 */
}

.phishing-container {
  background-color: #fff0f0;
  border: 2px solid #cc0000;
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
  margin-top: 2rem;
  box-shadow: 0 0 5px rgba(200, 0, 0, 0.3);
}

#phishingBtn {
  padding: 0.6rem 1.2rem;
  background-color: #cc0000;
  color: white;
  border: none;
  font-size: 1rem;
  border-radius: 4px;
  cursor: pointer;
}

#phishingBtn:hover {
  background-color: #990000;
}

#menu-toggle {
  display: none;
  background-color: #003366;
  color: white;
  font-size: 1.2rem;
  padding: 0.5rem;
  border: none;
  cursor: pointer;
}

@media (max-width: 768px) {
  .mobile-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: #003366;
  }

  #menu-toggle {
    display: block;
    font-size: 1.8rem;
    background: none;
    border: none;
    color: white; /* 改為白色才看得見 */
    cursor: pointer;
  }

  nav ul {
    display: none;
    flex-direction: column;
    background-color: #eeeeee;
    padding: 1rem;
    margin: 0;
    border-radius: 6px;
  }

  nav ul.active {
    display: flex;
  }

  nav ul li a {
    color: #222;  /* 避免預設白色被覆蓋 */
    font-weight: bold;
    text-decoration: none;
    padding: 0.5rem 0;
  }
}