:root {
  --primary-color: #2F6BFF;
  --secondary-color: #6FA3FF;
  --btn-gradient: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%);
  --card-bg: #FFFFFF;
  --section-bg: #F4F7FB;
  --text-main: #1F2D3D;
  --text-black: #000000;
  --border-color: #D6E2FF;
  --glow-color: #A5C4FF;
  --light-text: #ffffff;
  --dark-text: #333333;
}

.page-doi-tac {
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  color: var(--dark-text);
  background-color: var(--section-bg);
}

.page-doi-tac__content-area {
  max-width: 1170px;
  margin: 0 auto;
  padding: 40px 16px;
}

.page-doi-tac__section-title {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  color: var(--text-main);
  text-align: center;
  margin-bottom: 20px;
}

.page-doi-tac__section-title--light {
  color: var(--light-text);
}

.page-doi-tac__section-description {
  font-size: 18px;
  text-align: center;
  margin-bottom: 40px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  color: var(--dark-text);
}

.page-doi-tac__section-description--light {
  color: var(--light-text);
}

.page-doi-tac__btn-primary {
  display: inline-block;
  padding: 14px 30px;
  background: var(--btn-gradient);
  color: var(--light-text);
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(47, 107, 255, 0.3);
}

.page-doi-tac__btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

.page-doi-tac__btn-primary--large {
  font-size: 20px;
  padding: 16px 35px;
}

.page-doi-tac__btn-secondary {
  display: inline-block;
  padding: 14px 30px;
  background: var(--card-bg);
  color: var(--primary-color);
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.3s ease;
  border: 2px solid var(--primary-color);
  cursor: pointer;
}

.page-doi-tac__btn-secondary:hover {
  background: var(--primary-color);
  color: var(--light-text);
}

.page-doi-tac__btn-link {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s ease;
}

.page-doi-tac__btn-link:hover {
  text-decoration: underline;
  color: var(--secondary-color);
}

.page-doi-tac__hero-section {
  padding-top: 10px; /* Specific requirement */
  padding-bottom: 60px;
  background-color: var(--card-bg);
}

.page-doi-tac__hero-container {
  max-width: 1170px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  padding: 20px 16px;
  gap: 40px;
}

.page-doi-tac__hero-image {
  flex: 1 1 45%;
  text-align: center;
}

.page-doi-tac__hero-image img {
  max-width: 600px;
  width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.page-doi-tac__hero-content {
  flex: 1 1 45%;
  text-align: left;
  color: var(--text-main);
}

.page-doi-tac__main-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  color: var(--primary-color);
}

.page-doi-tac__hero-description {
  font-size: 18px;
  margin-bottom: 30px;
  color: var(--text-main);
}

.page-doi-tac__cta-group {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.page-doi-tac__intro-section {
  background-color: var(--primary-color);
  padding-top: 60px;
  padding-bottom: 60px;
  color: var(--light-text);
}

.page-doi-tac__intro-section .page-doi-tac__section-title,
.page-doi-tac__intro-section .page-doi-tac__section-description {
  color: var(--light-text);
}

.page-doi-tac__feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
  text-align: center;
}

.page-doi-tac__feature-item {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-doi-tac__icon-box-media {
  width: 180px;
  height: 180px;
  aspect-ratio: 1/1;
  margin: 0 auto 20px;
  border-radius: 50%;
  overflow: hidden;
  border: 4px solid var(--secondary-color);
  flex-shrink: 0;
}

.page-doi-tac__icon-box-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
}

.page-doi-tac__feature-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 15px;
  color: var(--light-text);
}

.page-doi-tac__feature-text {
  font-size: 16px;
  color: var(--light-text);
}

.page-doi-tac__models-section {
  padding-top: 60px;
  padding-bottom: 60px;
  background-color: var(--section-bg);
}

.page-doi-tac__model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-doi-tac__model-card {
  background: var(--card-bg);
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  color: var(--dark-text);
}

.page-doi-tac__model-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
}

.page-doi-tac__model-card .page-doi-tac__card-title {
  font-size: 22px;
  font-weight: 700;
  padding: 20px 20px 10px;
  color: var(--text-main);
}

.page-doi-tac__model-card .page-doi-tac__card-text {
  font-size: 16px;
  padding: 0 20px 20px;
  flex-grow: 1;
  color: var(--dark-text);
}

.page-doi-tac__model-card .page-doi-tac__btn-link {
  display: block;
  text-align: center;
  padding: 15px 20px;
  border-top: 1px solid var(--border-color);
  margin-top: auto;
}

.page-doi-tac__how-to-join-section {
  padding-top: 60px;
  padding-bottom: 60px;
  background-color: var(--card-bg);
}

.page-doi-tac__steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-doi-tac__step-item {
  text-align: center;
  padding: 30px;
  background: var(--section-bg);
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.page-doi-tac__step-number {
  font-size: 48px;
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: 15px;
  line-height: 1;
}

.page-doi-tac__step-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 15px;
  color: var(--text-main);
}

.page-doi-tac__step-text {
  font-size: 16px;
  color: var(--dark-text);
}

.page-doi-tac__cta-center {
  text-align: center;
  margin-top: 50px;
}

.page-doi-tac__faq-section {
  padding-top: 60px;
  padding-bottom: 60px;
  background-color: var(--section-bg);
}

.page-doi-tac__faq-list {
  max-width: 900px;
  margin: 40px auto 0;
}

.page-doi-tac__faq-item {
  background: var(--card-bg);
  border-radius: 12px;
  margin-bottom: 15px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  overflow: hidden;
  color: var(--dark-text);
}

.page-doi-tac__faq-item summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 25px;
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  list-style: none;
  color: var(--text-main);
}

.page-doi-tac__faq-item summary::-webkit-details-marker {
  display: none;
}

.page-doi-tac__faq-question {
  flex-grow: 1;
  color: var(--text-main);
}

.page-doi-tac__faq-toggle {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-color);
  margin-left: 15px;
  transition: transform 0.3s ease;
}

.page-doi-tac__faq-item[open] .page-doi-tac__faq-toggle {
  transform: rotate(45deg);
}

.page-doi-tac__faq-answer {
  padding: 0 25px 20px;
  font-size: 16px;
  color: var(--dark-text);
}

.page-doi-tac__faq-answer p {
  margin-bottom: 10px;
}

.page-doi-tac__faq-answer a {
  color: var(--primary-color);
  text-decoration: none;
}

.page-doi-tac__faq-answer a:hover {
  text-decoration: underline;
}

.page-doi-tac__cta-section {
  background-color: var(--primary-color);
  padding-top: 80px;
  padding-bottom: 80px;
  text-align: center;
  color: var(--light-text);
}

.page-doi-tac__cta-content {
  max-width: 900px;
  margin: 0 auto;
}

@media (max-width: 1024px) {
  .page-doi-tac__content-area {
    padding: 30px 16px;
  }
  .page-doi-tac__hero-container {
    flex-direction: column;
    text-align: center;
  }
  .page-doi-tac__hero-content {
    text-align: center;
  }
  .page-doi-tac__cta-group {
    justify-content: center;
  }
  .page-doi-tac__icon-box-media {
    width: 150px;
    height: 150px;
  }
  .page-doi-tac__model-card img {
    height: 200px;
  }
}

@media (max-width: 768px) {
  .page-doi-tac {
    font-size: 16px;
    line-height: 1.6;
  }

  /* Hero Section */
  .page-doi-tac__hero-section {
    padding-top: 10px !important;
    padding-bottom: 40px;
  }
  .page-doi-tac__hero-container {
    padding: 20px 15px !important;
    gap: 30px;
    flex-direction: column;
  }
  .page-doi-tac__main-title {
    font-size: 30px;
  }
  .page-doi-tac__hero-description {
    font-size: 16px;
  }
  .page-doi-tac__cta-group {
    flex-direction: column !important;
    gap: 15px !important;
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px !important;
    padding-right: 15px !important;
  }
  .page-doi-tac__btn-primary,
  .page-doi-tac__btn-secondary,
  .page-doi-tac__btn-primary--large {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    white-space: normal !important;
    word-wrap: break-word !important;
    padding-left: 15px !important;
    padding-right: 15px !important;
  }

  /* Intro Section */
  .page-doi-tac__intro-section {
    padding-top: 40px;
    padding-bottom: 40px;
  }
  .page-doi-tac__feature-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .page-doi-tac__icon-box-media {
    width: 200px !important;
    height: 200px !important;
  }

  /* Models Section */
  .page-doi-tac__models-section {
    padding-top: 40px;
    padding-bottom: 40px;
  }
  .page-doi-tac__model-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .page-doi-tac__model-card img {
    
  }

  /* How to Join Section */
  .page-doi-tac__how-to-join-section {
    padding-top: 40px;
    padding-bottom: 40px;
  }
  .page-doi-tac__steps-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* FAQ Section */
  .page-doi-tac__faq-section {
    padding-top: 40px;
    padding-bottom: 40px;
  }
  .page-doi-tac__faq-item summary {
    padding: 15px 20px;
    font-size: 16px;
  }
  .page-doi-tac__faq-answer {
    padding: 0 20px 15px;
    font-size: 15px;
  }

  /* Final CTA Section */
  .page-doi-tac__cta-section {
    padding-top: 50px;
    padding-bottom: 50px;
  }
  .page-doi-tac__section-title {
    font-size: 26px;
  }
  .page-doi-tac__section-description {
    font-size: 16px;
  }

  /* General images and containers for mobile */
  .page-doi-tac img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }
  .page-doi-tac__content-area,
  .page-doi-tac__card,
  .page-doi-tac__container,
  .page-doi-tac__hero-container,
  .page-doi-tac__feature-item,
  .page-doi-tac__model-card,
  .page-doi-tac__step-item,
  .page-doi-tac__faq-item,
  .page-doi-tac__cta-content {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px !important;
    padding-right: 15px !important;
  }
}