/* HERO: banner chính */
.page-index__hero-section { padding-top: 0; margin-top: 0; width: 100%; overflow: hidden; }
.page-index__hero-image { width: 100%; height: auto; display: block; object-fit: cover; aspect-ratio: 17/5; }

/* LOGO GRID: lưới logo + CTA */
.page-index__logo-grid-section { max-width: 1200px; margin: 16px auto 28px; padding: 0 16px; }
.page-index__logo-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px 16px; justify-items: center; }
.page-index__logo-item { display: flex; flex-direction: column; align-items: center; gap: 12px; width: 100%; max-width: 280px; text-align: center; }
.page-index__logo-image { width: 100%; height: auto; aspect-ratio: 2/1; object-fit: contain; display: block; }
.page-index__logo-cta { display: inline-block; padding: 10px 22px; border-radius: 999px; background: linear-gradient(180deg, #2B73F6 0%, #1144A6 100%); color: #ffffff; font-weight: 700; text-decoration: none; box-shadow: 0 4px 14px rgba(4, 119, 219, 0.35); transition: transform 0.2s ease, box-shadow 0.2s ease; }
.page-index__logo-cta:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(4, 119, 219, 0.5); }
.page-index__logo-item:nth-child(5) { grid-column: 2; }
.page-index__logo-item:nth-child(6) { grid-column: 3; }

/* GUIDE: SEO longform */
.page-index__guide-inner { max-width: 1000px; margin: 0 auto; padding: 16px 16px 48px; }
.page-index__guide-title { text-align: center; color: #0477db; margin: 12px 0 20px; font-size: 1.75rem; line-height: 1.3; font-weight: 700; }
.page-index__guide-inner h2 { color: #113B7A; margin-top: 36px; margin-bottom: 12px; font-size: 1.5rem; line-height: 1.3; }
.page-index__guide-inner h3 { color: #113B7A; margin-top: 24px; margin-bottom: 10px; font-size: 1.15rem; line-height: 1.3; }
.page-index__guide-inner p { line-height: 1.8; margin-bottom: 16px; color: #333333; }
.page-index__guide-inner ul { margin: 0 0 16px 20px; padding: 0; line-height: 1.8; color: #333333; }
.page-index__guide-figure { margin: 24px auto; text-align: center; max-width: 800px; }
.page-index__guide-figure img { width: 100%; height: auto; aspect-ratio: 2/1; object-fit: cover; display: block; border-radius: 8px; }
.page-index__guide-figure figcaption { font-size: 0.9rem; color: #666666; margin-top: 8px; font-style: italic; }
.page-index__guide-inner details { border: 1px solid #244D84; border-radius: 8px; padding: 12px 14px; margin-bottom: 10px; background: #f8fbff; }
.page-index__guide-inner summary { cursor: pointer; font-weight: 600; color: #113B7A; display: flex; justify-content: space-between; align-items: center; }
.page-index__guide-inner details p { margin-top: 10px; margin-bottom: 0; padding-left: 20px; }

/* Responsive: mobile */
@media (max-width: 768px) {
  .page-index__hero-image { aspect-ratio: 2/1; }
  .page-index__logo-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .page-index__logo-item:nth-child(5),
  .page-index__logo-item:nth-child(6) { grid-column: auto; }
  .page-index__logo-item { max-width: 100%; }
  .page-index__logo-image { max-width: 100%; height: auto; }
  .page-index__logo-cta { max-width: 100%; box-sizing: border-box; white-space: normal; word-wrap: break-word; padding: 10px 12px; font-size: 0.9rem; width: 100%; text-align: center; }
  .page-index__guide-title { font-size: 1.35rem; }
  .page-index__guide-inner { padding-left: 10px; padding-right: 10px; }
  .page-index__guide-inner h2 { font-size: 1.25rem; }
  .page-index__guide-inner h3 { font-size: 1.05rem; }
  .page-index img { max-width: 100% !important; height: auto !important; }
  .page-index__guide-figure img { max-width: 100% !important; height: auto !important; }
}

/* Responsive: tablet */
@media (min-width: 769px) and (max-width: 1024px) {
  .page-index__logo-grid { grid-template-columns: repeat(2, 1fr); }
  .page-index__logo-item:nth-child(5),
  .page-index__logo-item:nth-child(6) { grid-column: auto; }
  .page-index__logo-cta { padding: 10px 16px; font-size: 0.95rem; }
}

/* Cards and containers */
.page-index__logo-item, .page-index__guide-figure { background: #10233F; }
.page-index__guide-figure figcaption { color: #AFC4E8; }
.page-index__guide-inner h2, .page-index__guide-inner h3 { color: #F2C14E; }
.page-index__guide-figure img { border: 1px solid #244D84; }
.page-index__guide-inner p, .page-index__guide-inner li { color: #F3F8FF; }
.page-index__guide-inner details { background: #10233F; border-color: #244D84; }
.page-index__guide-inner summary { color: #F3F8FF; }
.page-index__guide-inner details p { color: #AFC4E8; }
.page-index__guide-title { color: #F2C14E; }