body {
  margin: 0;
  font-family: Arial, "Noto Sans KR", sans-serif;
  background: #f7f8fa;
  color: #222;
  line-height: 1.7;
}

.site-header {
  background: #111827;
  color: white;
  padding: 48px 24px;
  text-align: center;
}

.site-header h1 {
  margin: 0 0 12px;
  font-size: 36px;
  line-height: 1.3;
}

.site-header p {
  margin: 0;
  font-size: 18px;
  color: #d1d5db;
}

.book-header {
  background: #111827;
  color: white;
  padding: 40px 24px;
}

.book-header a {
  color: #d1d5db;
  text-decoration: none;
}

.book-header h1 {
  max-width: 980px;
  margin: 20px auto 8px;
  font-size: 34px;
  line-height: 1.3;
}

.book-header p {
  max-width: 980px;
  margin: 0 auto;
  color: #d1d5db;
  font-size: 18px;
}

.back {
  max-width: 980px;
  margin: 0 auto;
}

.home-main {
  max-width: 1100px;
  margin: 40px auto;
  padding: 0 24px;
}

.section-title {
  font-size: 28px;
  margin-bottom: 24px;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.book-card {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.04);
}

.book-card h3 {
  margin-top: 0;
  font-size: 22px;
  line-height: 1.35;
}

.book-card p {
  color: #4b5563;
}

.book-card a,
.button-link {
  display: inline-block;
  margin-top: 12px;
  padding: 10px 16px;
  background: #111827;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 700;
}

.layout {
  max-width: 1100px;
  margin: 40px auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
}

.book-sidebar {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 20px;
  height: fit-content;
  position: sticky;
  top: 24px;
}

.book-sidebar h2 {
  margin-top: 0;
  font-size: 18px;
}

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

.book-sidebar li {
  margin: 10px 0;
}

.book-sidebar a {
  color: #111827;
  text-decoration: none;
  font-weight: 600;
}

.book-sidebar a:hover {
  text-decoration: underline;
}

.content-card {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 32px;
}

.content-card h2 {
  margin-top: 32px;
  font-size: 24px;
}

.content-card h2:first-child {
  margin-top: 0;
}

.content-card h3 {
  margin-top: 24px;
  font-size: 20px;
}

.content-card p {
  color: #374151;
}

.content-card blockquote {
  margin: 24px 0;
  padding: 20px;
  background: #f3f4f6;
  border-left: 4px solid #111827;
  color: #374151;
}

.faq-item {
  margin-bottom: 28px;
}

.faq-item h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.buy-links {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.buy-link {
  display: block;
  padding: 16px 18px;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  color: #111827;
  text-decoration: none;
  font-weight: 700;
  background: #f9fafb;
}

.buy-link:hover {
  background: #f3f4f6;
}

.notice {
  margin-top: 28px;
  padding: 18px;
  background: #f3f4f6;
  border-radius: 12px;
  color: #374151;
}

.site-footer {
  margin-top: 60px;
  padding: 32px 24px;
  text-align: center;
  color: #6b7280;
  border-top: 1px solid #e5e7eb;
}

.book-cover-thumb {
  width: 100%;
  max-width: 220px;
  display: block;
  margin: 0 auto 20px;
  border-radius: 12px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.12);
}

.book-detail-hero {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 28px;
  align-items: start;
  margin-bottom: 32px;
}

.book-cover-large {
  width: 100%;
  max-width: 220px;
  border-radius: 12px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.14);
}

@media (max-width: 800px) {
  .book-detail-hero {
    grid-template-columns: 1fr;
  }

  .book-cover-large {
    max-width: 240px;
    margin: 0 auto;
    display: block;
  }
}

@media (max-width: 800px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .book-sidebar {
    position: static;
  }

  .site-header h1,
  .book-header h1 {
    font-size: 28px;
  }
}

/* Mobile overflow fix for FAQ and long content */
*,
*::before,
*::after {
  box-sizing: border-box;
}

.layout,
.content-card,
.book-sidebar,
.faq-page,
.faq-intro,
.faq-item,
.faq-final {
  min-width: 0;
  max-width: 100%;
}

.content-card,
.faq-item,
.faq-intro,
.faq-final {
  overflow-wrap: break-word;
  word-break: keep-all;
}

.faq-table {
  width: 100%;
  max-width: 100%;
}

@media (max-width: 800px) {
  .layout {
    width: 100%;
    max-width: 100%;
    padding-left: 16px;
    padding-right: 16px;
    overflow-x: hidden;
  }

  .content-card {
    width: 100%;
    padding: 24px 18px;
  }

  .faq-item {
    width: 100%;
    padding: 22px 18px;
  }

  .faq-item h3 {
    white-space: normal;
    overflow-wrap: break-word;
    word-break: keep-all;
  }

  .faq-table {
    display: block;
    overflow-x: auto;
    white-space: normal;
  }

  .faq-table th,
  .faq-table td {
    white-space: normal;
    min-width: 140px;
  }
}