:root {
  --primary-color: #FFD700; /* Vàng kim */
  --secondary-color: #1A202C; /* Xám than */
  --text-color-dark-bg: #ffffff; /* Văn bản trên nền tối */
  --text-color-light-bg: #333333; /* Văn bản trên nền sáng */
  --background-color-dark: #121212; /* Nền body từ shared.css */
  --card-bg-dark: rgba(255, 255, 255, 0.08); /* Nền thẻ trên nền tối */
  --card-border-dark: rgba(255, 255, 255, 0.15);
  --button-hover-dark: #ccad00;
  --button-secondary-hover-dark: #2a3447;
}

.page-content.page-about {
  color: var(--text-color-dark-bg); /* Body background is dark (#121212), so text should be light */
  padding-top: 120px; /* Adjust for fixed header on desktop */
  background-color: var(--background-color-dark);
}

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

/* Hero Section */
.page-about__hero-section {
  text-align: center;
  padding: 80px 0;
  background-color: var(--secondary-color);
  position: relative;
  overflow: hidden;
  border-bottom: 5px solid var(--primary-color);
}

.page-about__hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.7));
  z-index: 1;
}

.page-about__hero-section .page-about__container {
  position: relative;
  z-index: 2;
}

.page-about__main-title {
  font-size: 3.2em;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 25px;
  line-height: 1.2;
  text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.5);
}

.page-about__description {
  font-size: 1.2em;
  line-height: 1.7;
  margin-bottom: 40px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  color: var(--text-color-dark-bg);
}

.page-about__cta-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.page-about__cta-button {
  display: inline-block;
  padding: 15px 40px;
  border-radius: 8px;
  font-size: 1.1em;
  font-weight: bold;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  white-space: normal;
  word-wrap: break-word;
  max-width: 100%;
  box-sizing: border-box;
}

.page-about__btn-primary {
  background-color: var(--primary-color);
  color: var(--secondary-color);
  border: 2px solid var(--primary-color);
}

.page-about__btn-primary:hover {
  background-color: var(--button-hover-dark);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

.page-about__btn-secondary {
  background-color: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.page-about__btn-secondary:hover {
  background-color: var(--primary-color);
  color: var(--secondary-color);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

/* General Section Styling */
.page-about__section-title {
  font-size: 2.5em;
  font-weight: 700;
  text-align: center;
  margin-bottom: 50px;
  color: var(--primary-color);
  text-shadow: 1px 1px 5px rgba(0, 0, 0, 0.3);
}

.page-about__text-block {
  font-size: 1.1em;
  line-height: 1.8;
  text-align: center;
  max-width: 800px;
  margin: 0 auto 40px auto;
  color: var(--text-color-dark-bg);
}

.page-about__mission-vision-section,
.page-about__why-choose-section,
.page-about__how-to-join-section,
.page-about__faq-section {
  padding: 80px 0;
  background-color: var(--background-color-dark);
}

.page-about__history-section,
.page-about__commitment-section,
.page-about__blog-section {
  padding: 80px 0;
  background-color: var(--secondary-color);
}

/* Mission & Vision Section */
.page-about__content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.page-about__card {
  background-color: var(--card-bg-dark);
  border: 1px solid var(--card-border-dark);
  border-radius: 10px;
  padding: 30px;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  color: var(--text-color-dark-bg);
}

.page-about__card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.page-about__card-icon {
  width: 100px;
  height: 100px;
  margin-bottom: 20px;
  object-fit: contain;
}

.page-about__card-title {
  font-size: 1.6em;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 15px;
}

.page-about__card p {
  font-size: 1em;
  line-height: 1.7;
  color: var(--text-color-dark-bg);
}

/* History Section */
.page-about__timeline {
  position: relative;
  max-width: 900px;
  margin: 50px auto 0 auto;
  padding: 20px 0;
}

.page-about__timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  width: 2px;
  height: 100%;
  background: var(--primary-color);
  transform: translateX(-50%);
}

.page-about__timeline-item {
  position: relative;
  width: 50%;
  padding: 20px 0;
  padding-left: 50px;
}

.page-about__timeline-item:nth-child(odd) {
  left: 0;
  text-align: right;
  padding-left: 0;
  padding-right: 50px;
}

.page-about__timeline-item:nth-child(even) {
  left: 50%;
}

.page-about__timeline-item::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  background: var(--primary-color);
  border: 3px solid var(--text-color-dark-bg);
  border-radius: 50%;
  top: 25px;
  z-index: 1;
}

.page-about__timeline-item:nth-child(odd)::before {
  right: -8px;
  left: auto;
}

.page-about__timeline-item:nth-child(even)::before {
  left: -8px;
}

.page-about__timeline-year {
  font-size: 1.4em;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 10px;
}

.page-about__timeline p {
  font-size: 1em;
  line-height: 1.7;
  color: var(--text-color-dark-bg);
}

/* Why Choose Section */
.page-about__advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.page-about__advantage-item {
  background-color: var(--card-bg-dark);
  border: 1px solid var(--card-border-dark);
  border-radius: 10px;
  padding: 30px;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  color: var(--text-color-dark-bg);
}

.page-about__advantage-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.page-about__advantage-icon {
  width: 100px;
  height: 100px;
  margin-bottom: 20px;
  object-fit: contain;
}

.page-about__advantage-title {
  font-size: 1.6em;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 15px;
}

.page-about__advantage-item p {
  font-size: 1em;
  line-height: 1.7;
  color: var(--text-color-dark-bg);
}

/* Commitment Section */
.page-about__commitment-list {
  list-style: none;
  padding: 0;
  max-width: 800px;
  margin: 0 auto;
}

.page-about__commitment-list li {
  background-color: var(--card-bg-dark);
  border: 1px solid var(--card-border-dark);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 15px;
  font-size: 1.1em;
  line-height: 1.8;
  color: var(--text-color-dark-bg);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s ease;
}

.page-about__commitment-list li:hover {
  transform: translateX(5px);
}

.page-about__commitment-list li strong {
  color: var(--primary-color);
}

/* How to Join Section */
.page-about__steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-bottom: 50px;
}

.page-about__step-item {
  background-color: var(--card-bg-dark);
  border: 1px solid var(--card-border-dark);
  border-radius: 10px;
  padding: 30px;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  color: var(--text-color-dark-bg);
}

.page-about__step-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.page-about__step-icon {
  width: 100px;
  height: 100px;
  margin-bottom: 20px;
  object-fit: contain;
}

.page-about__step-title {
  font-size: 1.6em;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 15px;
}

.page-about__step-item p {
  font-size: 1em;
  line-height: 1.7;
  color: var(--text-color-dark-bg);
}

.page-about__cta-center {
  text-align: center;
  margin-top: 40px;
}

/* FAQ Section */
.page-about__faq-list {
  max-width: 900px;
  margin: 0 auto;
}

.page-about__faq-item {
  margin-bottom: 15px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.page-about__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 25px;
  background: var(--card-bg-dark);
  border: 1px solid var(--card-border-dark);
  border-radius: 8px;
  cursor: pointer;
  user-select: none;
  transition: background-color 0.3s ease, border-color 0.3s ease;
  position: relative;
}

.page-about__faq-question:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--primary-color);
}

.page-about__faq-question h3 {
  margin: 0;
  padding: 0;
  flex: 1;
  font-size: 1.2em;
  font-weight: 600;
  line-height: 1.5;
  color: var(--primary-color);
  pointer-events: none; /* Prevent h3 from blocking click event */
}

.page-about__faq-toggle {
  font-size: 24px;
  font-weight: bold;
  line-height: 1;
  color: var(--primary-color);
  transition: transform 0.3s ease, color 0.3s ease;
  flex-shrink: 0;
  margin-left: 15px;
  pointer-events: none; /* Prevent icon from blocking click event */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
}

.page-about__faq-item.active .page-about__faq-toggle {
  transform: rotate(45deg);
  color: var(--primary-color);
}

.page-about__faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
  padding: 0 25px;
  opacity: 0;
  background-color: var(--card-bg-dark);
  color: var(--text-color-dark-bg);
  border: 1px solid var(--card-border-dark);
  border-top: none;
  border-radius: 0 0 8px 8px;
}

.page-about__faq-item.active .page-about__faq-answer {
  max-height: 2000px !important; /* Ensure content fits */
  padding: 20px 25px !important;
  opacity: 1;
}

.page-about__faq-answer p {
  margin: 0;
  font-size: 1em;
  line-height: 1.7;
  color: var(--text-color-dark-bg);
}

/* Blog Section */
.page-about__blog-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.page-about__blog-item {
  background-color: var(--card-bg-dark);
  border: 1px solid var(--card-border-dark);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about__blog-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.page-about__blog-link {
  text-decoration: none;
  display: block;
  color: inherit;
}

.page-about__blog-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

.page-about__blog-item-title {
  font-size: 1.4em;
  font-weight: 600;
  color: var(--primary-color);
  margin: 20px 20px 10px 20px;
  line-height: 1.4;
}

.page-about__blog-item-excerpt {
  font-size: 0.95em;
  color: var(--text-color-dark-bg);
  margin: 0 20px 15px 20px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.page-about__blog-item-date {
  display: block;
  font-size: 0.85em;
  color: #aaaaaa;
  margin: 0 20px 20px 20px;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .page-about__main-title {
    font-size: 2.8em;
  }
  .page-about__section-title {
    font-size: 2em;
  }
  .page-about__timeline-item {
    padding-left: 30px;
  }
  .page-about__timeline-item:nth-child(odd) {
    padding-right: 30px;
  }
}

@media (max-width: 768px) {
  .page-content.page-about {
    padding-top: 100px !important; /* Adjust for fixed header on mobile */
    font-size: 16px;
    line-height: 1.6;
  }

  .page-about__container {
    padding: 0 15px;
  }

  .page-about__hero-section,
  .page-about__mission-vision-section,
  .page-about__history-section,
  .page-about__why-choose-section,
  .page-about__commitment-section,
  .page-about__how-to-join-section,
  .page-about__faq-section,
  .page-about__blog-section {
    padding: 60px 0;
  }

  .page-about__main-title {
    font-size: 2.2em;
    margin-bottom: 20px;
  }

  .page-about__description {
    font-size: 1em;
    margin-bottom: 30px;
  }

  .page-about__cta-buttons {
    flex-direction: column;
    gap: 15px;
  }

  .page-about__cta-button {
    padding: 12px 25px;
    font-size: 1em;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
  }

  .page-about__section-title {
    font-size: 1.8em;
    margin-bottom: 40px;
  }

  .page-about__text-block {
    font-size: 1em;
    margin-bottom: 30px;
  }

  .page-about__content-grid,
  .page-about__advantages-grid,
  .page-about__steps-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-about__card,
  .page-about__advantage-item,
  .page-about__step-item,
  .page-about__blog-item {
    padding: 25px;
  }

  .page-about__card-title,
  .page-about__advantage-title,
  .page-about__step-title {
    font-size: 1.4em;
  }

  .page-about__timeline::before {
    left: 18px;
  }

  .page-about__timeline-item {
    width: 100%;
    padding-left: 50px;
  }

  .page-about__timeline-item:nth-child(odd) {
    left: 0;
    text-align: left;
    padding-right: 0;
    padding-left: 50px;
  }

  .page-about__timeline-item:nth-child(odd)::before {
    left: 10px;
    right: auto;
  }

  .page-about__timeline-item:nth-child(even) {
    left: 0;
  }

  .page-about__timeline-item:nth-child(even)::before {
    left: 10px;
  }

  .page-about__commitment-list li {
    font-size: 1em;
    padding: 18px;
  }

  .page-about__faq-question {
    padding: 15px 20px;
  }

  .page-about__faq-question h3 {
    font-size: 1.1em;
  }

  .page-about__faq-toggle {
    font-size: 20px;
    width: 24px;
    height: 24px;
  }

  .page-about__faq-answer {
    padding: 0 20px;
  }

  .page-about__faq-item.active .page-about__faq-answer {
    padding: 15px 20px !important;
  }

  .page-about__blog-image {
    height: 180px;
  }

  .page-about__blog-item-title {
    font-size: 1.2em;
    margin: 15px 15px 8px 15px;
  }

  .page-about__blog-item-excerpt,
  .page-about__blog-item-date {
    margin-left: 15px;
    margin-right: 15px;
  }

  /* Image responsive adjustments */
  .page-about img {
    max-width: 100% !important;
    height: auto !important;
    display: block !important;
  }
  
  .page-about__container,
  .page-about__hero-section,
  .page-about__mission-vision-section,
  .page-about__history-section,
  .page-about__why-choose-section,
  .page-about__commitment-section,
  .page-about__how-to-join-section,
  .page-about__faq-section,
  .page-about__blog-section,
  .page-about__card,
  .page-about__advantage-item,
  .page-about__step-item,
  .page-about__blog-item,
  .page-about__cta-buttons,
  .page-about__cta-center {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    overflow: hidden !important; /* Ensure no overflow */
  }
  
  .page-about__cta-center .page-about__cta-button {
    width: calc(100% - 30px) !important;
    margin: 0 auto;
  }
}

@media (max-width: 480px) {
  .page-about__main-title {
    font-size: 1.8em;
  }
  .page-about__section-title {
    font-size: 1.6em;
  }
  .page-about__card-title,
  .page-about__advantage-title,
  .page-about__step-title {
    font-size: 1.2em;
  }
  .page-about__timeline-year {
    font-size: 1.2em;
  }
  .page-about__faq-question h3 {
    font-size: 1em;
  }
  .page-about__faq-question {
    padding: 12px 15px;
  }
  .page-about__faq-answer {
    padding: 0 15px;
  }
  .page-about__faq-item.active .page-about__faq-answer {
    padding: 12px 15px !important;
  }
}