/* CSS cho trang st666 */
    :root {
      --page-st666-primary-bg: #1a1a1a;
      --page-st666-secondary-bg: #2a2a2a;
      --page-st666-text-color: #f0f0f0;
      --page-st666-accent-color: #ffd700; /* Gold */
      --page-st666-dark-text: #1a1a1a;
      --page-st666-border-color: #444;
      --page-st666-button-hover: #e0b800;
    }

    .page-st666 {
      font-family: 'Arial', sans-serif;
      color: var(--page-st666-text-color);
      background-color: var(--page-st666-primary-bg);
      line-height: 1.6;
      overflow-x: hidden;
      padding-top: 160px; /* Vùng an toàn cho banner, tránh bị menu nổi che khuất */
    }

    .page-st666 a {
      color: var(--page-st666-accent-color);
      text-decoration: none;
      transition: color 0.3s ease;
    }

    .page-st666 a:hover {
      color: var(--page-st666-button-hover);
    }

    .page-st666-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
    }

    .page-st666-section {
      padding: 40px 0;
      text-align: center;
    }

    .page-st666-section-dark {
      background-color: var(--page-st666-secondary-bg);
    }

    .page-st666-title {
      font-size: 2.5em;
      color: var(--page-st666-accent-color);
      margin-bottom: 20px;
      text-transform: uppercase;
      position: relative;
      padding-bottom: 10px;
    }

    .page-st666-title::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 60px;
      height: 3px;
      background-color: var(--page-st666-accent-color);
    }

    .page-st666-subtitle {
      font-size: 1.8em;
      color: var(--page-st666-text-color);
      margin-bottom: 20px;
    }

    .page-st666-text {
      font-size: 1.1em;
      margin-bottom: 15px;
      color: var(--page-st666-text-color);
    }

    /* Hero Section */
    .page-st666-hero-section {
      background-color: var(--page-st666-primary-bg);
      text-align: center;
      padding: 20px 0 0; /* Giảm padding top để banner sát trên, nhưng vẫn có padding-top của .page-st666 */
      margin-bottom: 30px;
    }

    .page-st666-hero-image {
      max-width: 100%;
      height: auto;
      display: block;
      margin: 0 auto;
      border-radius: 8px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
    }

    .page-st666-hero-content {
      padding: 20px 15px;
      max-width: 800px;
      margin: 0 auto;
    }

    .page-st666-hero-content h1 {
      font-size: 2.8em;
      color: var(--page-st666-accent-color);
      margin-bottom: 15px;
      line-height: 1.2;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-st666-hero-content p {
      font-size: 1.2em;
      color: var(--page-st666-text-color);
      margin-bottom: 25px;
    }

    .page-st666-button {
      display: inline-block;
      background-color: var(--page-st666-accent-color);
      color: var(--page-st666-dark-text);
      padding: 12px 30px;
      border-radius: 5px;
      font-size: 1.1em;
      font-weight: bold;
      text-transform: uppercase;
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
    }

    .page-st666-button:hover {
      background-color: var(--page-st666-button-hover);
      transform: translateY(-2px);
    }

    /* Game Categories */
    .page-st666-games-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

    .page-st666-game-card {
      background-color: var(--page-st666-secondary-bg);
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 15px;
    }

    .page-st666-game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.5);
    }

    .page-st666-game-card img {
      max-width: 100%;
      height: auto;
      border-radius: 5px;
      margin-bottom: 10px;
    }

    .page-st666-game-card h3 {
      font-size: 1.2em;
      color: var(--page-st666-accent-color);
      margin-bottom: 5px;
      text-align: center;
    }

    .page-st666-game-card a {
      display: block;
      width: 100%;
      padding: 8px 0;
      background-color: var(--page-st666-accent-color);
      color: var(--page-st666-dark-text);
      border-radius: 5px;
      font-weight: bold;
      text-transform: uppercase;
      font-size: 0.9em;
      margin-top: 10px;
    }

    .page-st666-game-card a:hover {
      background-color: var(--page-st666-button-hover);
    }

    /* Promotions */
    .page-st666-promo-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-st666-promo-card {
      background-color: var(--page-st666-secondary-bg);
      border-radius: 8px;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
      padding: 25px;
      text-align: left;
      transition: transform 0.3s ease;
    }

    .page-st666-promo-card:hover {
      transform: translateY(-5px);
    }

    .page-st666-promo-card h3 {
      color: var(--page-st666-accent-color);
      font-size: 1.5em;
      margin-bottom: 10px;
    }

    .page-st666-promo-card p {
      color: var(--page-st666-text-color);
      margin-bottom: 15px;
    }

    .page-st666-promo-card .page-st666-button {
      padding: 10px 20px;
      font-size: 1em;
    }

    /* Game Providers */
    .page-st666-providers-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
      gap: 15px;
      margin-top: 30px;
      align-items: center;
      justify-items: center;
    }

    .page-st666-provider-logo {
      background-color: var(--page-st666-secondary-bg);
      padding: 10px;
      border-radius: 8px;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
      transition: transform 0.2s ease;
      max-width: 120px;
      height: 60px; /* Cố định chiều cao để logo đồng đều */
      display: flex;
      align-items: center;
      justify-content: center;
    }
    
    .page-st666-provider-logo:hover {
        transform: scale(1.05);
    }

    .page-st666-provider-logo img {
      max-width: 100%;
      max-height: 100%;
      display: block;
      object-fit: contain; /* Đảm bảo logo không bị méo */
    }

    /* Why Choose Us */
    .page-st666-advantage-list {
      list-style: none;
      padding: 0;
      margin-top: 30px;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 20px;
    }

    .page-st666-advantage-list li {
      background-color: var(--page-st666-secondary-bg);
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
      text-align: left;
      position: relative;
      padding-left: 60px;
    }

    .page-st666-advantage-list li::before {
      content: '✔';
      color: var(--page-st666-accent-color);
      font-size: 1.8em;
      position: absolute;
      left: 20px;
      top: 50%;
      transform: translateY(-50%);
    }

    .page-st666-advantage-list li strong {
      display: block;
      color: var(--page-st666-accent-color);
      font-size: 1.3em;
      margin-bottom: 5px;
    }

    /* FAQ */
    .page-st666-faq-item {
      background-color: var(--page-st666-secondary-bg);
      border-radius: 8px;
      margin-bottom: 15px;
      overflow: hidden;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    }

    .page-st666-faq-question {
      padding: 15px 20px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: bold;
      color: var(--page-st666-accent-color);
      font-size: 1.1em;
    }

    .page-st666-faq-question .icon {
      font-size: 1.5em;
      transition: transform 0.3s ease;
    }

    .page-st666-faq-answer {
      padding: 0 20px 15px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease-out, padding 0.4s ease-out;
      color: var(--page-st666-text-color);
      text-align: left;
    }

    .page-st666-faq-item.active .page-st666-faq-answer {
      max-height: 200px; /* Giới hạn chiều cao để có hiệu ứng trượt */
      padding-top: 10px;
    }

    .page-st666-faq-item.active .page-st666-faq-question .icon {
      transform: rotate(180deg);
    }

    /* Floating Login Button */
    .page-st666-floating-btn {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--page-st666-accent-color);
      color: var(--page-st666-dark-text);
      padding: 15px 25px;
      border-radius: 50px;
      font-size: 1.1em;
      font-weight: bold;
      text-transform: uppercase;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
      z-index: 1000;
      transition: transform 0.3s ease, opacity 0.3s ease;
      display: none; /* Ẩn ban đầu, JS sẽ hiện khi scroll */
    }

    .page-st666-floating-btn.show {
      display: inline-block;
      transform: translateY(0);
      opacity: 1;
    }
    .page-st666-floating-btn.hide {
      transform: translateY(100px);
      opacity: 0;
    }

    .page-st666-floating-btn:hover {
      background-color: var(--page-st666-button-hover);
      transform: scale(1.05);
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-st666-title {
        font-size: 2em;
      }
      .page-st666-hero-content h1 {
        font-size: 2em;
      }
      .page-st666-hero-content p {
        font-size: 1em;
      }
      .page-st666-games-grid,
      .page-st666-promo-grid,
      .page-st666-advantage-list {
        grid-template-columns: 1fr;
      }
      .page-st666-provider-logo {
        max-width: 100px;
        height: 50px;
      }
      .page-st666-floating-btn {
        bottom: 15px;
        right: 15px;
        padding: 12px 20px;
        font-size: 1em;
      }
      .page-st666-section {
        padding: 30px 0;
      }
      .page-st666-game-card {
        padding: 10px;
      }
      .page-st666-game-card h3 {
        font-size: 1.1em;
      }
      .page-st666-game-card a {
        font-size: 0.85em;
        padding: 6px 0;
      }
    }
    @media (max-width: 480px) {
      .page-st666-hero-content h1 {
        font-size: 1.8em;
      }
      .page-st666-title {
        font-size: 1.8em;
      }
      .page-st666-hero-image {
        border-radius: 0; /* Full width on very small screens */
      }
    }