body {
  margin: 0;
  font-family: 'Orbitron', 'Segoe UI', '微軟正黑體', sans-serif;
  color: #fff;
  background: #0c0c1e;
  overflow-x: hidden;
  position: relative;
}

#particles-js {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

header, main, footer {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

header a[href^="mailto:"] {
  color: #00ffff;       
  font-weight: bold;       
  text-shadow: 0 0 8px #00ffffaa; 
  transition: color 0.3s ease;
}

header {
  padding: 2rem 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 16px #0006;
}

header img {
  border-radius: 20%;
  box-shadow: 0 4px 12px #00ffff55;
  width: 160px;
  height: 160px;
  object-fit: cover;
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.4rem;
  letter-spacing: 2px;
  color: #00ffff;
  text-shadow: 0 0 10px #00ffffaa, 0 0 20px #00ffff55;
}

h2 {
  font-size: 1.6rem;
  margin: 1.5rem 0;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #00ffff;
  text-shadow: 0 0 6px #00ffffaa;
  text-align: center;
}

.btn-group {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.main-btn {
  padding: 0.6em 2em;
  font-size: 1.1rem;
  font-weight: bold;
  border-radius: 24px;
  text-decoration: none;
  color: #fff;
  background: linear-gradient(90deg, #00ffff, #0044ff);
  box-shadow: 0 0 12px #00ffff80;
  transition: all 0.3s ease;
}

.main-btn:hover {
  background: linear-gradient(90deg, #0044ff, #00ffff);
  box-shadow: 0 0 20px #00ffffcc;
}

section {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(6px);
  border-radius: 18px;
  box-shadow: 0 4px 20px #00f2;
  padding: 2rem;
  margin: 2rem 0;
  width: 90%;
  max-width: 560px;
  transition: box-shadow 0.3s ease;
}

section:hover {
  box-shadow: 0 8px 30px #00f5;
}

ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

ul li {
  margin: 0.5rem 0;
  font-size: 1.1rem;
  letter-spacing: 1px;
}

.highlight-link {
  position: relative;
  color: #fff;
  text-decoration: none;
  font-weight: bold;
}

.highlight-link::after {
  content: '';
  position: absolute;
  left: 0; bottom: -2px;
  width: 100%;
  height: 2px;
  background: #00ffff;
  box-shadow: 0 0 6px #00ffffaa;
}

/* 新增：取消粗體，讓strong不粗體 */
.highlight-link strong {
  font-weight: normal;
}

.banner-title {
  font-size: 1.6rem; 
  margin: 1.5rem 0; 
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #00ffff;
  text-shadow: 0 0 6px #00ffffaa;
  text-align: center;
  font-weight: bold; 
  font-family: 'Orbitron', 'Segoe UI', '微軟正黑體', sans-serif;
}

section img {
  border-radius: 12px;
  max-width: 100%;
  box-shadow: 0 4px 16px #0009;
}

footer {
  padding: 1.2rem 0;
  font-size: 1rem;
  color: #00ffff;
  background: rgba(0, 0, 0, 0.3);
  text-shadow: 0 0 6px #00ffffaa;
  width: 100%;
}

@media (max-width: 600px) {
  header img {
    width: 100px;
    height: 100px;
  }

  h1 {
    font-size: 1.6rem;
  }

  section {
    padding: 1rem;
  }
}