/* =============================================
   PWA SEO Sections - Stylesheet v1.0
   pwa.css の後に読み込まれることを前提
   /pwa ページ SEO 追加セクション専用
   HTML: inc_pwa_seo.php のクラス名に完全準拠
   ============================================= */

/* ===== Custom Properties ===== */
:root {
  --pwa-seo-primary: #454c84;
  --pwa-seo-primary-light: #5a63a0;
  --pwa-seo-accent: #f0ecfc;
  --pwa-seo-accent-dark: #e0d8f8;
  --pwa-seo-gradient: linear-gradient(135deg, #454c84 0%, #667eea 100%);
  --pwa-seo-surface: #f8f9fa;
  --pwa-seo-surface-alt: #fafbff;
  --pwa-seo-border: #e5e7eb;
  --pwa-seo-border-light: #f0f0f5;
  --pwa-seo-text: #333;
  --pwa-seo-text-heading: #1a1a2e;
  --pwa-seo-text-muted: #666;
  --pwa-seo-text-dim: #999;
  --pwa-seo-radius: 12px;
  --pwa-seo-radius-sm: 8px;
  --pwa-seo-transition: 0.2s ease;
}

/* ===== 1. Common Section Wrapper ===== */

.pwa-seo-about,
.pwa-seo-lang,
.pwa-seo-offline,
.pwa-seo-compare,
.pwa-seo-usecases,
.pwa-seo-faq {
  max-width: 900px;
  margin: 0 auto 40px;
  padding: 36px 24px 0;
  border-top: 1px solid var(--pwa-seo-border);
}

.pwa-seo-about {
  margin-top: 40px;
}

/* ===== 2. Headings ===== */

.pwa-seo-heading {
  font-size: 1.3rem;
  color: var(--pwa-seo-text-heading);
  margin: 0 0 20px;
  padding-left: 14px;
  border-left: 4px solid var(--pwa-seo-primary);
  line-height: 1.4;
}

.pwa-seo-subheading {
  font-size: 1.05rem;
  color: var(--pwa-seo-text-heading);
  margin: 28px 0 12px;
}

/* Common paragraph inside sections */
.pwa-seo-about p,
.pwa-seo-lang p,
.pwa-seo-offline p,
.pwa-seo-compare p,
.pwa-seo-usecases p,
.pwa-seo-faq p {
  font-size: 0.95rem;
  color: var(--pwa-seo-text);
  line-height: 1.75;
  margin: 0 0 16px;
}

.pwa-seo-intro {
  font-size: 1rem;
  color: var(--pwa-seo-text);
  line-height: 1.8;
  margin-bottom: 24px;
}

/* ===== 3. Block A: PWA Diff Grid (3 columns) ===== */

.pwa-seo-diff-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.pwa-seo-diff-card {
  padding: 22px 18px;
  background: var(--pwa-seo-surface);
  border-radius: var(--pwa-seo-radius);
  border: 1px solid var(--pwa-seo-border-light);
  text-align: center;
  transition: box-shadow var(--pwa-seo-transition), transform var(--pwa-seo-transition);
}

.pwa-seo-diff-card:hover {
  box-shadow: 0 4px 16px rgba(69, 76, 132, 0.1);
  transform: translateY(-2px);
}

.pwa-seo-diff-highlight {
  background: var(--pwa-seo-accent);
  border-color: var(--pwa-seo-primary);
  border-width: 2px;
}

.pwa-seo-diff-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  background: var(--pwa-seo-gradient);
  color: #fff;
  border-radius: 50%;
  font-size: 1.2rem;
  box-shadow: 0 3px 8px rgba(69, 76, 132, 0.2);
}

.pwa-seo-diff-card h4 {
  font-size: 0.95rem;
  color: var(--pwa-seo-text-heading);
  margin: 0 0 8px;
}

.pwa-seo-diff-card p {
  font-size: 0.85rem;
  color: var(--pwa-seo-text-muted);
  line-height: 1.6;
  margin: 0;
}

/* ===== 4. Merits (Block A continued) ===== */

.pwa-seo-merits {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.pwa-seo-merit-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px;
  background: var(--pwa-seo-surface-alt);
  border-radius: var(--pwa-seo-radius);
  border: 1px solid var(--pwa-seo-border-light);
  transition: box-shadow var(--pwa-seo-transition), transform var(--pwa-seo-transition);
}

.pwa-seo-merit-item:hover {
  box-shadow: 0 4px 16px rgba(69, 76, 132, 0.1);
  transform: translateY(-2px);
}

.pwa-seo-merit-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--pwa-seo-accent);
  border-radius: 50%;
  font-size: 1.2rem;
  color: var(--pwa-seo-primary);
}

.pwa-seo-merit-body {
  flex: 1;
  min-width: 0;
}

.pwa-seo-merit-body h4 {
  font-size: 0.95rem;
  color: var(--pwa-seo-text-heading);
  margin: 0 0 4px;
}

.pwa-seo-merit-body p {
  font-size: 0.85rem;
  color: var(--pwa-seo-text-muted);
  line-height: 1.6;
  margin: 0;
}

/* ===== 5. Block B: Language Grid ===== */

.pwa-seo-lang-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.pwa-seo-lang-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--pwa-seo-accent);
  color: var(--pwa-seo-primary);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 20px;
  border: 1px solid var(--pwa-seo-border-light);
  transition: background var(--pwa-seo-transition), transform var(--pwa-seo-transition);
}

.pwa-seo-lang-chip:hover {
  background: var(--pwa-seo-accent-dark);
  transform: translateY(-1px);
}

/* Language feature cards */
.pwa-seo-lang-features {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.pwa-seo-lang-feature {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px;
  background: var(--pwa-seo-surface-alt);
  border-radius: var(--pwa-seo-radius);
  border: 1px solid var(--pwa-seo-border-light);
  transition: box-shadow var(--pwa-seo-transition);
}

.pwa-seo-lang-feature:hover {
  box-shadow: 0 4px 16px rgba(69, 76, 132, 0.1);
}

.pwa-seo-lang-feature-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--pwa-seo-gradient);
  color: #fff;
  border-radius: 50%;
  font-size: 1.1rem;
  box-shadow: 0 3px 8px rgba(69, 76, 132, 0.2);
}

.pwa-seo-lang-feature-body {
  flex: 1;
  min-width: 0;
}

.pwa-seo-lang-feature-body h4 {
  font-size: 0.95rem;
  color: var(--pwa-seo-text-heading);
  margin: 0 0 4px;
}

.pwa-seo-lang-feature-body p {
  font-size: 0.85rem;
  color: var(--pwa-seo-text-muted);
  line-height: 1.6;
  margin: 0;
}

/* ===== 6. Block C: Offline Grid ===== */

.pwa-seo-offline-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 16px;
}

.pwa-seo-offline-card {
  padding: 22px 18px;
  background: var(--pwa-seo-surface-alt);
  border-radius: var(--pwa-seo-radius);
  border: 1px solid var(--pwa-seo-border-light);
  text-align: center;
  transition: box-shadow var(--pwa-seo-transition), transform var(--pwa-seo-transition);
}

.pwa-seo-offline-card:hover {
  box-shadow: 0 4px 16px rgba(69, 76, 132, 0.1);
  transform: translateY(-2px);
}

.pwa-seo-offline-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  background: var(--pwa-seo-accent);
  border-radius: 50%;
  font-size: 1.1rem;
  color: var(--pwa-seo-primary);
}

.pwa-seo-offline-card h4 {
  font-size: 0.95rem;
  color: var(--pwa-seo-text-heading);
  margin: 0 0 8px;
}

.pwa-seo-offline-card p {
  font-size: 0.85rem;
  color: var(--pwa-seo-text-muted);
  line-height: 1.6;
  margin: 0;
}

.pwa-seo-offline-note {
  font-size: 0.85rem;
  color: var(--pwa-seo-text-dim);
  line-height: 1.6;
  padding: 12px 16px;
  background: var(--pwa-seo-surface);
  border-radius: var(--pwa-seo-radius-sm);
  border-left: 3px solid var(--pwa-seo-border);
}

/* ===== 7. Block D: Comparison Table ===== */

.pwa-seo-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 20px;
  border-radius: var(--pwa-seo-radius);
  border: 1px solid var(--pwa-seo-border);
}

.pwa-seo-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  min-width: 540px;
}

.pwa-seo-table thead th {
  background: var(--pwa-seo-primary);
  color: #fff;
  font-weight: 600;
  padding: 12px 16px;
  text-align: left;
  white-space: nowrap;
  font-size: 0.875rem;
}

.pwa-seo-table th.pwa-seo-highlight,
.pwa-seo-table td.pwa-seo-highlight {
  background: rgba(240, 236, 252, 0.45);
  font-weight: 600;
}

.pwa-seo-table thead th.pwa-seo-highlight {
  background: var(--pwa-seo-primary-light);
}

.pwa-seo-table tbody tr {
  border-bottom: 1px solid var(--pwa-seo-border-light);
}

.pwa-seo-table tbody tr:nth-child(even) {
  background: var(--pwa-seo-surface);
}

.pwa-seo-table tbody tr:nth-child(even) .pwa-seo-highlight {
  background: rgba(240, 236, 252, 0.55);
}

.pwa-seo-table tbody td {
  padding: 11px 16px;
  color: var(--pwa-seo-text);
  vertical-align: middle;
}

.pwa-seo-table tbody td:first-child {
  font-weight: 500;
  color: var(--pwa-seo-text-heading);
  white-space: nowrap;
}

.pwa-seo-table .mark-yes {
  color: #2e7d32;
  font-weight: 600;
}

.pwa-seo-table .mark-no {
  color: var(--pwa-seo-text-dim);
}

.pwa-seo-compare-summary {
  font-size: 0.95rem;
  color: var(--pwa-seo-primary);
  font-weight: 500;
  line-height: 1.7;
  margin-top: 8px;
}

/* ===== 8. Block E: Use Cases ===== */

.pwa-seo-usecase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.pwa-seo-usecase-card {
  position: relative;
  padding: 24px 22px 18px;
  background: linear-gradient(145deg, var(--pwa-seo-accent) 0%, var(--pwa-seo-surface-alt) 60%, #fff 100%);
  border-radius: var(--pwa-seo-radius);
  border: 1px solid var(--pwa-seo-border-light);
  transition: box-shadow var(--pwa-seo-transition);
}

.pwa-seo-usecase-card:hover {
  box-shadow: 0 4px 18px rgba(69, 76, 132, 0.1);
}

.pwa-seo-usecase-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--pwa-seo-gradient);
  color: #fff;
  border-radius: 50%;
  font-size: 1.1rem;
  margin-bottom: 14px;
  box-shadow: 0 3px 8px rgba(69, 76, 132, 0.2);
}

.pwa-seo-usecase-card h3 {
  font-size: 1rem;
  color: var(--pwa-seo-text-heading);
  margin: 0 0 8px;
}

.pwa-seo-usecase-card p {
  font-size: 0.875rem;
  color: var(--pwa-seo-text-muted);
  margin: 0;
  line-height: 1.65;
}

/* ===== 9. CTA Button ===== */

.pwa-seo-cta {
  text-align: center;
  margin-top: 24px;
}

.pwa-seo-cta-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--pwa-seo-gradient);
  color: #fff !important;
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: 30px;
  text-decoration: none;
  transition: opacity var(--pwa-seo-transition), box-shadow var(--pwa-seo-transition), transform var(--pwa-seo-transition);
  box-shadow: 0 4px 12px rgba(69, 76, 132, 0.25);
}

.pwa-seo-cta-button:hover {
  opacity: 0.9;
  box-shadow: 0 6px 18px rgba(69, 76, 132, 0.35);
  transform: translateY(-1px);
  color: #fff;
  text-decoration: none;
}

/* ===== 10. Block F: FAQ Accordion ===== */

.pwa-seo-faq-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.pwa-seo-faq-item {
  border: 1px solid var(--pwa-seo-border);
  border-radius: var(--pwa-seo-radius-sm);
  overflow: hidden;
  transition: border-color var(--pwa-seo-transition);
}

.pwa-seo-faq-item:hover {
  border-color: var(--pwa-seo-primary);
}

.pwa-seo-faq-item[open] {
  border-color: var(--pwa-seo-primary);
  box-shadow: 0 2px 8px rgba(69, 76, 132, 0.08);
}

.pwa-seo-faq-item summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--pwa-seo-text-heading);
  background: #fff;
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: background var(--pwa-seo-transition), color var(--pwa-seo-transition);
}

.pwa-seo-faq-item summary::-webkit-details-marker {
  display: none;
}

.pwa-seo-faq-item summary::before {
  content: '\25B6';
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  font-size: 0.6rem;
  color: var(--pwa-seo-primary);
  background: var(--pwa-seo-accent);
  border-radius: 50%;
  transition: transform 0.25s ease, background var(--pwa-seo-transition);
}

.pwa-seo-faq-item[open] summary::before {
  content: '\25BC';
  background: var(--pwa-seo-primary);
  color: #fff;
}

.pwa-seo-faq-item summary:hover {
  background: var(--pwa-seo-surface);
  color: var(--pwa-seo-primary);
}

.pwa-seo-faq-item[open] summary {
  background: var(--pwa-seo-accent);
  color: var(--pwa-seo-primary);
  border-bottom: 1px solid var(--pwa-seo-border-light);
}

.pwa-seo-faq-item p {
  padding: 16px 18px 18px 54px;
  font-size: 0.9rem;
  color: var(--pwa-seo-text);
  line-height: 1.75;
  background: #fff;
  margin: 0;
}

.pwa-seo-faq-item p a {
  color: var(--pwa-seo-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.pwa-seo-faq-item p a:hover {
  color: var(--pwa-seo-primary-light);
}

/* ===== Mobile Responsive (768px) ===== */

@media (max-width: 768px) {

  .pwa-seo-about,
  .pwa-seo-lang,
  .pwa-seo-offline,
  .pwa-seo-compare,
  .pwa-seo-usecases,
  .pwa-seo-faq {
    padding: 28px 16px 0;
    margin-bottom: 32px;
  }

  .pwa-seo-heading {
    font-size: 1.15rem;
  }

  /* Diff grid: 1 column */
  .pwa-seo-diff-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* Offline grid: 1 column */
  .pwa-seo-offline-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* Use cases: 1 column */
  .pwa-seo-usecase-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .pwa-seo-usecase-card {
    padding: 20px 18px 16px;
  }

  /* Compare: horizontal scroll */
  .pwa-seo-table-wrapper {
    margin-left: -8px;
    margin-right: -8px;
    border-radius: var(--pwa-seo-radius-sm);
  }

  /* Merit items */
  .pwa-seo-merit-item {
    padding: 14px;
  }

  /* Language features */
  .pwa-seo-lang-feature {
    padding: 14px;
  }

  /* FAQ */
  .pwa-seo-faq-item summary {
    padding: 12px 14px;
    font-size: 0.9rem;
  }

  .pwa-seo-faq-item p {
    padding: 14px 14px 16px 44px;
  }

  /* CTA: full-width */
  .pwa-seo-cta-button {
    display: flex;
    justify-content: center;
    width: 100%;
    padding: 14px 24px;
  }
}

/* ===== Small Screens (480px) ===== */

@media (max-width: 480px) {

  .pwa-seo-heading {
    font-size: 1.05rem;
    padding-left: 12px;
  }

  .pwa-seo-diff-icon {
    width: 40px;
    height: 40px;
    font-size: 1.05rem;
  }

  .pwa-seo-merit-icon,
  .pwa-seo-offline-icon,
  .pwa-seo-lang-feature-icon {
    width: 38px;
    height: 38px;
    font-size: 1rem;
  }

  .pwa-seo-table {
    font-size: 0.825rem;
  }

  .pwa-seo-table thead th,
  .pwa-seo-table tbody td {
    padding: 9px 12px;
  }

  .pwa-seo-usecase-card p {
    font-size: 0.825rem;
  }

  .pwa-seo-faq-item p {
    padding-left: 14px;
    font-size: 0.85rem;
  }

  .pwa-seo-lang-chip {
    font-size: 0.825rem;
    padding: 6px 12px;
  }
}