/* 標題間距大幅優化版 */
.content h2 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-size: 2rem;
  font-weight: 700;
  color: #0a17a3;
}

.content h3 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-size: 1.6rem;
  font-weight: 600;
  color: #5e064b;
}

.content p {
  margin-bottom: 1.25rem;
}

@media (min-width: 768px) {
  .toc {
    position: fixed;
    right: 2rem;
    top: 6rem;
    width: 220px;
    max-height: calc(100vh - 10rem);
    overflow-y: auto;
  }
}

.nav-article-link {
  display: inline-block;
  padding: 0.6rem 1.5rem;
  background-color: #f0f0f5;
  border-radius: 999px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  color: #333;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.nav-article-link:hover {
  background-color: #007BFF;
  color: #fff;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.nav-article-prev .nav-arrow,
.nav-article-next .nav-arrow {
  font-size: 1.2rem;
  vertical-align: middle;
}

.nav-article-prev .nav-arrow {
  margin-right: 0.5rem;
}

.nav-article-next .nav-arrow {
  margin-left: 0.5rem;
}

.container > .row,
section > .row,
.main > .container > .row {
  display: flex;
  flex-wrap: wrap;
}

.pdf-download-box {
  background-color: #f5f5f5;
  border-left: 5px solid #00BFFF;
  padding: 1rem;
  margin-top: 2rem;
  margin-bottom: 2rem;
  border-radius: 8px;
  font-size: 1.1rem;
  color: #333;
}

.pdf-download-link {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.4rem 0.8rem;
  background-color: #00BFFF;
  color: white;
  text-decoration: none;
  border-radius: 4px;
  font-weight: bold;
  transition: background-color 0.3s ease;
}

.pdf-download-link:hover {
  background-color: #007acc;
}

.hero h1, .hero p {
  color: white;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

/* Header整體 */
.header {
  width: 100%;
  background-color: transparent;
  padding: 10px 20px;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-left {
  display: flex;
  align-items: center;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo img,
.logo-image {
  height: 45px;
  max-width: 180px;
  object-fit: contain;
  animation: fadeInZoom 1s ease forwards;
  opacity: 0;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.logo img:hover,
.logo-image:hover {
  transform: scale(1.08);
  box-shadow: 0 4px 10px rgba(255, 255, 255, 0.6);
}

#theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  transition: transform 0.3s ease, background-color 0.3s ease;
  padding: 6px;
}

#theme-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
  transform: scale(1.2);
  border-radius: 50%;
}

@keyframes fadeInZoom {
  0% {
    opacity: 0;
    transform: scale(0.8);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@media (max-width: 768px) {
  .nav {
    flex-direction: column;
    align-items: center;
    padding: 10px 0;
  }

  .nav-left, .nav-right {
    justify-content: center;
    width: 100%;
    margin-bottom: 10px;
  }

  .logo img,
  .logo-image {
    height: 36px;
  }
}

.content {
  padding: 20px;
  max-width: 1200px;
  margin: auto;
}

.page-title {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  text-align: center;
}

@media (min-width: 1024px) {
  body.single main {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
  }

  body.single main .content {
    flex: 1;
    max-width: none;
    margin: 0;
    padding: 0;
  }

  body.single main .toc {
    position: sticky;
    top: 6rem;
    width: 240px;
    flex-shrink: 0;
    max-height: calc(100vh - 10rem);
    overflow-y: auto;
  }
}

/* 小於 1200px 時自動隱藏 TOC，避免壓縮主文 */
@media (max-width: 1199px) {
  .body.single main .toc {
    display: none;
  }
}