.page-xo-so {
  font-family: 'Arial', sans-serif;
  color: #333;
  line-height: 1.6;
  background-color: #f8f8f8;
}

.page-xo-so .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.page-xo-so section {
  padding: 60px 0;
  margin-bottom: 20px;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.page-xo-so section:nth-child(even) {
  background-color: #fdfdfd;
}

.page-xo-so h1, .page-xo-so h2, .page-xo-so h3 {
  color: #000080;
  text-align: center;
  margin-bottom: 30px;
  font-weight: bold;
}

.page-xo-so h1 {
  font-size: 2.8em;
  color: #FFD700; /* Vàng kim */
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.page-xo-so h2 {
  font-size: 2.2em;
  color: #000080; /* Xanh đậm */
}

.page-xo-so h3 {
  font-size: 1.6em;
  color: #000080;
}

.page-xo-so p {
  text-align: justify;
  margin-bottom: 15px;
  color: #555;
}

.page-xo-so .cta-button, .page-xo-so .cta-button-secondary, .page-xo-so .btn-play, .page-xo-so .btn-step, .page-xo-so .btn-promo, .page-xo-so .read-more {
  display: inline-block;
  padding: 15px 30px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  transition: all 0.3s ease;
  text-align: center;
  cursor: pointer;
}

.page-xo-so .cta-button {
  background: linear-gradient(90deg, #FFD700, #FFA500);
  color: #000080;
  font-size: 1.2em;
  border: none;
  box-shadow: 0 5px 15px rgba(255, 215, 0, 0.4);
}

.page-xo-so .cta-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(255, 215, 0, 0.6);
}

.page-xo-so .cta-button-secondary {
  background: #000080;
  color: #FFD700;
  border: 2px solid #FFD700;
  font-size: 1.1em;
  margin-top: 20px;
}

.page-xo-so .cta-button-secondary:hover {
  background: #000066;
  color: #FFFFFF;
  border-color: #FFFFFF;
  transform: translateY(-2px);
}

/* Hero Section */
.page-xo-so .hero-section {
  position: relative;
  width: 100%;
  padding: 0;
  background: linear-gradient(135deg, #000080, #1a1a5a);
  overflow: hidden;
  border-radius: 0;
  box-shadow: none;
  margin-bottom: 0;
}

.page-xo-so .hero-container {
  position: relative;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}

.page-xo-so .hero-image {
  width: 100%;
  margin-bottom: 30px;
}

.page-xo-so .hero-image img {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  border-radius: 8px;
  object-fit: cover;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.page-xo-so .hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  width: 100%;
  color: #fff;
}

.page-xo-so .hero-content h1 {
  margin-top: 0;
  margin-bottom: 20px;
  font-size: 3.5em;
  color: #FFD700; /* Vàng kim */
  line-height: 1.2;
}

.page-xo-so .hero-content p {
  font-size: 1.3em;
  margin-bottom: 30px;
  color: #e0e0e0;
  text-align: center;
}

.page-xo-so .hero-content .cta-button {
  font-size: 1.4em;
  padding: 18px 45px;
}

/* Section Intro */
.page-xo-so .section-intro p {
  font-size: 1.1em;
}

.page-xo-so .feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-xo-so .feature-item {
  text-align: center;
  padding: 25px;
  border-radius: 8px;
  background-color: #f9f9f9;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.page-xo-so .feature-item img {
  width: 100px;
  height: 100px;
  margin-bottom: 15px;
  object-fit: contain;
}

.page-xo-so .feature-item h3 {
  font-size: 1.4em;
  margin-top: 0;
  margin-bottom: 10px;
  color: #000080;
}

.page-xo-so .feature-item p {
  font-size: 0.95em;
  color: #666;
  text-align: center;
}

/* Game Type Cards */
.page-xo-so .game-type-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-xo-so .game-card {
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-xo-so .game-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.page-xo-so .game-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-bottom: 1px solid #eee;
}

.page-xo-so .game-card h3 {
  font-size: 1.5em;
  margin: 20px 0 10px;
  padding: 0 15px;
}

.page-xo-so .game-card h3 a {
  color: #000080;
  text-decoration: none;
}

.page-xo-so .game-card h3 a:hover {
  color: #FFD700;
}

.page-xo-so .game-card p {
  font-size: 0.95em;
  color: #666;
  padding: 0 15px 20px;
  text-align: center;
}

.page-xo-so .btn-play {
  background-color: #FFD700;
  color: #000080;
  padding: 10px 25px;
  margin-bottom: 20px;
  font-size: 1em;
  border: none;
}

.page-xo-so .btn-play:hover {
  background-color: #FFA500;
  color: #fff;
}

/* Section Advantages */
.page-xo-so .section-advantages ul {
  list-style: none;
  padding: 0;
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.page-xo-so .section-advantages ul li {
  background-color: #f9f9f9;
  padding: 20px;
  border-left: 5px solid #FFD700;
  border-radius: 5px;
  font-size: 1.1em;
  color: #444;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.page-xo-so .section-advantages ul li strong {
  color: #000080;
}

/* Section How To */
.page-xo-so .step-by-step {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-xo-so .step-item {
  text-align: center;
  padding: 30px 20px;
  border: 1px solid #eee;
  border-radius: 8px;
  background-color: #fefefe;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.page-xo-so .step-item .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background-color: #000080;
  color: #FFD700;
  border-radius: 50%;
  font-size: 1.8em;
  font-weight: bold;
  margin-bottom: 20px;
  box-shadow: 0 4px 10px rgba(0, 0, 128, 0.3);
}

.page-xo-so .step-item h3 {
  margin-top: 0;
  margin-bottom: 15px;
  color: #000080;
}

.page-xo-so .step-item p {
  font-size: 0.95em;
  color: #666;
  text-align: center;
}

.page-xo-so .btn-step {
  background-color: #FFD700;
  color: #000080;
  padding: 10px 20px;
  margin-top: 15px;
  font-size: 0.9em;
  border: none;
}

.page-xo-so .btn-step:hover {
  background-color: #FFA500;
  color: #fff;
}

/* Section Promotions */
.page-xo-so .promo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-xo-so .promo-card {
  background-color: #fefefe;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-xo-so .promo-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.page-xo-so .promo-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-bottom: 1px solid #eee;
}

.page-xo-so .promo-card h3 {
  font-size: 1.4em;
  margin: 20px 0 10px;
  padding: 0 15px;
}

.page-xo-so .promo-card h3 a {
  color: #000080;
  text-decoration: none;
}

.page-xo-so .promo-card h3 a:hover {
  color: #FFD700;
}

.page-xo-so .promo-card p {
  font-size: 0.95em;
  color: #666;
  padding: 0 15px 20px;
  text-align: center;
}

.page-xo-so .btn-promo {
  background-color: #000080;
  color: #FFD700;
  padding: 10px 25px;
  margin-bottom: 20px;
  font-size: 1em;
  border: none;
}

.page-xo-so .btn-promo:hover {
  background-color: #1a1a5a;
  color: #fff;
}

.page-xo-so .promo-note {
  text-align: center;
  font-style: italic;
  color: #777;
  margin-top: 30px;
}

/* Section Security */
.page-xo-so .security-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-xo-so .security-item {
  text-align: center;
  padding: 25px;
  border-radius: 8px;
  background-color: #f9f9f9;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.page-xo-so .security-item img {
  width: 100px;
  height: 100px;
  margin-bottom: 15px;
  object-fit: contain;
}

.page-xo-so .security-item h3 {
  font-size: 1.4em;
  margin-top: 0;
  margin-bottom: 10px;
  color: #000080;
}

.page-xo-so .security-item p {
  font-size: 0.95em;
  color: #666;
  text-align: center;
}

/* FAQ Section */
.page-xo-so .section-faq {
  background-color: #fefefe;
}

.page-xo-so .faq-list {
  margin-top: 30px;
}

.page-xo-so .faq-item {
  margin-bottom: 15px;
  border: 1px solid #e0e0e0;
  border-radius: 5px;
  overflow: hidden;
}

.page-xo-so .faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px;
  background: #fff;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.page-xo-so .faq-question:hover {
  background: #f5f5f5;
}

.page-xo-so .faq-question h3 {
  margin: 0;
  font-size: 1.2em;
  color: #000080;
  text-align: left;
}

.page-xo-so .faq-toggle {
  font-size: 24px;
  font-weight: bold;
  color: #FFD700;
  transition: transform 0.3s ease;
}

.page-xo-so .faq-item.active .faq-toggle {
  transform: rotate(45deg);
  color: #000080;
}

.page-xo-so .faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-out, padding 0.4s ease-out;
  padding: 0 15px;
  background: #f9f9f9;
}

.page-xo-so .faq-item.active .faq-answer {
  max-height: 500px; /* Đủ lớn để chứa nội dung */
  padding: 15px;
  border-top: 1px solid #eee;
}

.page-xo-so .faq-answer p {
  margin: 0;
  color: #555;
  text-align: justify;
}

/* Section Blog */
.page-xo-so .blog-posts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-xo-so .blog-card {
  background-color: #fefefe;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  text-align: left;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-xo-so .blog-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.page-xo-so .blog-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-bottom: 1px solid #eee;
}

.page-xo-so .blog-card h3 {
  font-size: 1.3em;
  margin: 20px 15px 10px;
  text-align: left;
}

.page-xo-so .blog-card h3 a {
  color: #000080;
  text-decoration: none;
}

.page-xo-so .blog-card h3 a:hover {
  color: #FFD700;
}

.page-xo-so .blog-card p {
  font-size: 0.9em;
  color: #666;
  padding: 0 15px 15px;
  text-align: justify;
}

.page-xo-so .read-more {
  display: block;
  color: #FFD700;
  text-decoration: none;
  font-weight: bold;
  padding: 0 15px 20px;
  text-align: left;
}

.page-xo-so .read-more:hover {
  text-decoration: underline;
  color: #FFA500;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .page-xo-so .hero-content h1 {
    font-size: 3em;
  }
  .page-xo-so .hero-content p {
    font-size: 1.2em;
  }
}

@media (max-width: 768px) {
  .page-xo-so section {
    padding: 40px 0;
  }
  .page-xo-so .container {
    padding: 0 15px;
  }
  .page-xo-so h1 {
    font-size: 2.5em;
  }
  .page-xo-so h2 {
    font-size: 1.8em;
  }
  .page-xo-so h3 {
    font-size: 1.3em;
  }
  .page-xo-so .cta-button {
    font-size: 1.1em;
    padding: 12px 25px;
  }
  .page-xo-so .hero-content h1 {
    font-size: 2.5em;
  }
  .page-xo-so .hero-content p {
    font-size: 1em;
  }
  .page-xo-so .hero-content .cta-button {
    font-size: 1.2em;
    padding: 15px 30px;
  }
  .page-xo-so .feature-grid, .page-xo-so .game-type-cards, .page-xo-so .step-by-step, .page-xo-so .promo-grid, .page-xo-so .security-features, .page-xo-so .blog-posts {
    grid-template-columns: 1fr;
  }
  .page-xo-so .faq-question {
    flex-direction: column;
    align-items: flex-start;
    padding: 12px;
  }
  .page-xo-so .faq-question h3 {
    margin-bottom: 8px;
  }
  .page-xo-so .faq-toggle {
    align-self: flex-end;
    margin-top: -30px;
    font-size: 20px;
  }
  .page-xo-so .faq-item.active .faq-answer {
    padding: 12px;
  }
}

@media (max-width: 480px) {
  .page-xo-so h1 {
    font-size: 2em;
  }
  .page-xo-so h2 {
    font-size: 1.6em;
  }
  .page-xo-so .hero-content h1 {
    font-size: 2em;
  }
  .page-xo-so .hero-content .cta-button {
    font-size: 1em;
    padding: 12px 25px;
  }
  .page-xo-so .feature-item img, .page-xo-so .security-item img {
    width: 80px;
    height: 80px;
  }
  .page-xo-so .step-item .step-number {
    width: 40px;
    height: 40px;
    font-size: 1.5em;
  }
}