:root {
      --page-ok365__primary-color: #e44d26; /* Cam đỏ */
      --page-ok365__secondary-color: #f7a01d; /* Cam vàng */
      --page-ok365__dark-bg: #1a1a1a;
      --page-ok365__light-bg: #ffffff;
      --page-ok365__text-color: #ffffff;
      --page-ok365__heading-color: #ffffff;
      --page-ok365__border-color: #333333;
      --page-ok365__accent-color: #4CAF50; /* Xanh lá cho button */
    }

    body {
      margin: 0;
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-ok365__text-color);
      background-color: var(--page-ok365__dark-bg);
    }

    .page-ok365 {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      overflow-x: hidden;
      box-sizing: border-box;
      padding: 0 15px; /* Giảm padding tổng thể */
    }

    .page-ok365__hero-section {
      position: relative;
      width: 100%;
      min-height: 300px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      padding: 10px 0 50px 0; /* Đảm bảo không bị header che */
      background-color: #0d0d0d;
      overflow: hidden;
      box-sizing: border-box;
    }

    .page-ok365__hero-image {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.4;
      z-index: 1;
      max-width: 100%; /* Responsive */
      box-sizing: border-box;
    }

    .page-ok365__hero-content {
      position: relative;
      z-index: 2;
      padding: 20px;
      max-width: 900px;
      box-sizing: border-box;
    }

    .page-ok365__main-heading {
      font-size: 2.8em;
      color: var(--page-ok365__heading-color);
      margin-bottom: 15px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
      line-height: 1.2;
    }

    .page-ok365__hero-text {
      font-size: 1.2em;
      color: #e0e0e0;
      margin-bottom: 30px;
    }

    .page-ok365__promotion-button-fixed {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--page-ok365__accent-color);
      color: var(--page-ok365__text-color);
      padding: 15px 25px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
      z-index: 1000;
      transition: background-color 0.3s ease, transform 0.2s ease;
      animation: page-ok365__pulse 1.5s infinite;
      border: none;
      cursor: pointer;
    }

    .page-ok365__promotion-button-fixed:hover {
      background-color: #5cb85c;
      transform: translateY(-2px);
    }

    @keyframes page-ok365__pulse {
      0% {
        transform: scale(1);
      }
      50% {
        transform: scale(1.05);
      }
      100% {
        transform: scale(1);
      }
    }

    .page-ok365__section {
      padding: 40px 0;
      background-color: var(--page-ok365__dark-bg);
      border-bottom: 1px solid var(--page-ok365__border-color);
      box-sizing: border-box;
    }

    .page-ok365__section-heading {
      font-size: 2em;
      color: var(--page-ok365__heading-color);
      text-align: center;
      margin-bottom: 30px;
      position: relative;
      padding-bottom: 10px;
    }

    .page-ok365__section-heading::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 60px;
      height: 3px;
      background-color: var(--page-ok365__primary-color);
    }

    .page-ok365__text-block {
      max-width: 800px;
      margin: 0 auto 30px auto;
      padding: 0 15px;
      color: #e0e0e0;
    }

    .page-ok365__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      padding: 0 15px;
      max-width: 1200px;
      margin: 0 auto;
      box-sizing: border-box;
    }

    .page-ok365__game-card {
      background-color: #2a2a2a;
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
      box-sizing: border-box;
    }

    .page-ok365__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
    }

    .page-ok365__game-card-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      max-width: 100%;
      box-sizing: border-box;
    }

    .page-ok365__game-card-content {
      padding: 20px;
      flex-grow: 1;
      box-sizing: border-box;
    }

    .page-ok365__game-card-title {
      font-size: 1.5em;
      color: var(--page-ok365__primary-color);
      margin-top: 0;
      margin-bottom: 10px;
    }

    .page-ok365__game-card-description {
      font-size: 0.95em;
      color: #c0c0c0;
    }

    .page-ok365__steps-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
      max-width: 800px;
      margin: 0 auto;
      padding: 0 15px;
      box-sizing: border-box;
    }

    .page-ok365__step-item {
      background-color: #2a2a2a;
      border-left: 5px solid var(--page-ok365__secondary-color);
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
      box-sizing: border-box;
    }

    .page-ok365__step-title {
      font-size: 1.3em;
      color: var(--page-ok365__heading-color);
      margin-top: 0;
      margin-bottom: 10px;
    }

    .page-ok365__step-description {
      color: #c0c0c0;
    }

    .page-ok365__promo-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 25px;
      padding: 0 15px;
      max-width: 1200px;
      margin: 0 auto;
      box-sizing: border-box;
    }

    .page-ok365__promo-card {
      background-color: #2a2a2a;
      border-radius: 10px;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
      padding: 25px;
      text-align: center;
      transition: transform 0.3s ease, background-color 0.3s ease;
      box-sizing: border-box;
    }

    .page-ok365__promo-card:hover {
      transform: translateY(-5px);
      background-color: #3a3a3a;
    }

    .page-ok365__promo-icon {
      font-size: 3em;
      color: var(--page-ok365__accent-color);
      margin-bottom: 15px;
    }

    .page-ok365__promo-title {
      font-size: 1.6em;
      color: var(--page-ok365__heading-color);
      margin-top: 0;
      margin-bottom: 10px;
    }

    .page-ok365__promo-description {
      color: #c0c0c0;
      margin-bottom: 20px;
    }

    .page-ok365__download-section {
      text-align: center;
      padding: 0 15px;
      box-sizing: border-box;
    }

    .page-ok365__download-links {
      display: flex;
      justify-content: center;
      gap: 20px;
      flex-wrap: wrap;
      margin-top: 30px;
    }

    .page-ok365__download-button {
      background-color: var(--page-ok365__primary-color);
      color: var(--page-ok365__text-color);
      padding: 12px 25px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease;
      border: none;
      cursor: pointer;
    }

    .page-ok365__download-button:hover {
      background-color: #cc4220;
    }

    .page-ok365__faq-container {
      max-width: 800px;
      margin: 0 auto;
      padding: 0 15px;
      box-sizing: border-box;
    }

    .page-ok365__faq-item {
      background-color: #2a2a2a;
      margin-bottom: 15px;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
      box-sizing: border-box;
    }

    .page-ok365__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px;
      background-color: #333333;
      color: var(--page-ok365__heading-color);
      cursor: pointer;
      user-select: none;
      font-size: 1.1em;
      font-weight: bold;
      transition: background-color 0.3s ease;
      box-sizing: border-box;
    }

    .page-ok365__faq-question h3 {
      margin: 0;
      color: inherit;
      pointer-events: none; /* Prevent h3 from blocking click */
    }

    .page-ok365__faq-question:hover {
      background-color: #444444;
    }

    .page-ok365__faq-toggle {
      font-size: 1.5em;
      line-height: 1;
      margin-left: 15px;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle from blocking click */
    }

    .page-ok365__faq-item.active .page-ok365__faq-toggle {
      transform: rotate(45deg);
    }

    .page-ok365__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 15px;
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      color: #c0c0c0;
      box-sizing: border-box;
    }

    .page-ok365__faq-item.active .page-ok365__faq-answer {
      max-height: 2000px !important;
      padding: 20px 15px !important;
      opacity: 1;
    }

    .page-ok365__conclusion-section {
      text-align: center;
      padding: 0 15px;
      box-sizing: border-box;
    }

    .page-ok365__conclusion-text {
      max-width: 800px;
      margin: 0 auto 30px auto;
      color: #e0e0e0;
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-ok365 {
        padding: 0 10px;
      }

      .page-ok365__hero-section {
        padding-top: 10px; /* Adjust for fixed header on mobile */
        min-height: 250px;
      }

      .page-ok365__main-heading {
        font-size: 2em;
      }

      .page-ok365__hero-text {
        font-size: 1em;
      }

      .page-ok365__section-heading {
        font-size: 1.6em;
      }

      .page-ok365__text-block,
      .page-ok365__steps-list,
      .page-ok365__faq-container,
      .page-ok365__conclusion-text {
        padding: 0 10px;
      }

      .page-ok365__game-grid,
      .page-ok365__promo-grid {
        grid-template-columns: 1fr;
        padding: 0 10px;
      }

      .page-ok365__game-card-image {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }

      .page-ok365__game-card,
      .page-ok365__promo-card,
      .page-ok365__step-item,
      .page-ok365__faq-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }

      .page-ok365__game-grid,
      .page-ok365__promo-grid,
      .page-ok365__steps-list,
      .page-ok365__faq-container {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-ok365__promotion-button-fixed {
        bottom: 15px;
        right: 15px;
        padding: 12px 20px;
        font-size: 1em;
      }
    }

    @media (max-width: 480px) {
      .page-ok365__main-heading {
        font-size: 1.8em;
      }
      .page-ok365__hero-text {
        font-size: 0.9em;
      }
      .page-ok365__section-heading {
        font-size: 1.4em;
      }
      .page-ok365__download-links {
        flex-direction: column;
        align-items: center;
      }
      .page-ok365__download-button {
        width: 80%;
        max-width: 250px;
      }
    }