.page-lich-su-phat-trien {
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  color: #FFF6D6; /* Text Main */
  background-color: #0A0A0A; /* Background */
}

.page-lich-su-phat-trien__container {
  max-width: 1170px;
  margin: 0 auto;
  padding: 0 16px;
  box-sizing: border-box;
}

.page-lich-su-phat-trien__dark-bg {
  background-color: #0A0A0A;
  color: #FFF6D6;
}

.page-lich-su-phat-trien__card {
  background-color: #111111; /* Card BG */
  color: #FFF6D6; /* Text Main */
  border: 1px solid #3A2A12; /* Border */
  border-radius: 8px;
  padding: 30px;
  margin-bottom: 40px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.page-lich-su-phat-trien__hero-section {
  padding-top: 10px; /* Small top padding, assuming shared.css handles body padding */
  padding-bottom: 60px;
  background-color: #0A0A0A;
  color: #FFF6D6;
}

.page-lich-su-phat-trien__hero-container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  padding: 60px 16px;
}

.page-lich-su-phat-trien__hero-content {
  flex: 1 1 500px; /* Allow content to grow and shrink */
  max-width: 600px;
}

.page-lich-su-phat-trien__main-title {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
  color: #F2C14E; /* Main color for emphasis */
}

.page-lich-su-phat-trien__hero-description {
  font-size: 1.1rem;
  margin-bottom: 30px;
  color: #FFF6D6;
}

.page-lich-su-phat-trien__cta-buttons {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.page-lich-su-phat-trien__cta-buttons--bottom {
    margin-top: 40px;
    justify-content: center;
}

.page-lich-su-phat-trien__cta-button {
  display: inline-block;
  padding: 14px 30px;
  border-radius: 50px;
  font-size: 1.1rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  transition: all 0.3s ease;
  box-sizing: border-box;
  white-space: normal;
  word-wrap: break-word;
}

.page-lich-su-phat-trien__btn-primary {
  background: linear-gradient(180deg, #FFD86A 0%, #DDA11D 100%); /* Button gradient */
  color: #ffffff; /* Button text always white */
  border: 2px solid transparent;
}

.page-lich-su-phat-trien__btn-primary:hover {
  background: linear-gradient(180deg, #FFD36B 0%, #F2C14E 100%);
  box-shadow: 0 0 15px #FFD36B; /* Glow */
}

.page-lich-su-phat-trien__btn-secondary {
  background-color: transparent;
  color: #F2C14E; /* Main color */
  border: 2px solid #F2C14E; /* Main color border */
}

.page-lich-su-phat-trien__btn-secondary:hover {
  background-color: #F2C14E;
  color: #0A0A0A;
  box-shadow: 0 0 15px #F2C14E; /* Glow */
}

.page-lich-su-phat-trien__cta-button--small {
    padding: 10px 20px;
    font-size: 1rem;
}

.page-lich-su-phat-trien__hero-image {
  flex: 1 1 400px; /* Allow image to grow and shrink */
  text-align: center;
}

.page-lich-su-phat-trien__hero-side-image {
  max-width: 600px;
  width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.page-lich-su-phat-trien__section-title {
  font-size: 2.2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 30px;
  color: #F2C14E; /* Main color */
}

.page-lich-su-phat-trien__section-description {
  font-size: 1.1rem;
  text-align: center;
  max-width: 800px;
  margin: 0 auto 40px;
  color: #FFF6D6;
}

.page-lich-su-phat-trien__intro-section {
  padding: 60px 0;
  margin-top: -80px; /* Pull up to overlap hero slightly */
  position: relative;
  z-index: 1;
}

.page-lich-su-phat-trien__icon-boxes {
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
  justify-content: center;
}

.page-lich-su-phat-trien__icon-box {
  flex: 1 1 300px;
  max-width: 350px;
  text-align: center;
  padding: 25px;
  border-radius: 8px;
  background-color: #0A0A0A;
  border: 1px solid #3A2A12;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.page-lich-su-phat-trien__icon-box-media {
  width: 200px;
  height: 200px;
  aspect-ratio: 1 / 1;
  margin: 0 auto 20px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid #F2C14E;
}

.page-lich-su-phat-trien__icon-box-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-lich-su-phat-trien__icon-box-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 15px;
  color: #FFD36B; /* Auxiliary color */
}

.page-lich-su-phat-trien__icon-box-text {
  font-size: 1rem;
  color: #FFF6D6;
}

.page-lich-su-phat-trien__content-section {
  padding: 60px 0;
}

.page-lich-su-phat-trien__paragraph {
  font-size: 1.1rem;
  margin-bottom: 20px;
  line-height: 1.7;
  color: #FFF6D6;
}

.page-lich-su-phat-trien__milestone-list {
  list-style: none;
  padding: 0;
  margin: 0 0 40px 0;
}

.page-lich-su-phat-trien__milestone-item {
  background-color: #0A0A0A;
  border: 1px solid #3A2A12;
  border-radius: 8px;
  padding: 25px;
  margin-bottom: 20px;
  position: relative;
  padding-left: 50px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.page-lich-su-phat-trien__milestone-item::before {
  content: '📅';
  position: absolute;
  left: 15px;
  top: 20px;
  font-size: 24px;
}

.page-lich-su-phat-trien__milestone-title {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: #FFD36B;
}

.page-lich-su-phat-trien__milestone-description {
  font-size: 1rem;
  color: #FFF6D6;
}

.page-lich-su-phat-trien__content-image {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 40px auto;
  border-radius: 8px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
}

.page-lich-su-phat-trien__faq-section {
  padding: 60px 0;
}

.page-lich-su-phat-trien__faq-list {
  max-width: 900px;
  margin: 0 auto;
}

.page-lich-su-phat-trien__faq-item {
  background-color: #0A0A0A;
  border: 1px solid #3A2A12;
  border-radius: 8px;
  margin-bottom: 15px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.page-lich-su-phat-trien__faq-item summary {
  display: block;
  padding: 20px 25px;
  cursor: pointer;
  outline: none;
  list-style: none;
  color: #F2C14E;
  font-size: 1.2rem;
  font-weight: 600;
  position: relative;
}

.page-lich-su-phat-trien__faq-item summary::-webkit-details-marker {
  display: none;
}

.page-lich-su-phat-trien__faq-item summary:hover {
  background-color: rgba(242, 193, 78, 0.1);
}

.page-lich-su-phat-trien__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.page-lich-su-phat-trien__faq-toggle {
  font-size: 1.8rem;
  line-height: 1;
  margin-left: 15px;
  color: #FFD36B;
}

.page-lich-su-phat-trien__faq-item[open] .page-lich-su-phat-trien__faq-toggle {
  content: '−';
}

.page-lich-su-phat-trien__faq-answer {
  padding: 0 25px 20px;
  font-size: 1rem;
  color: #FFF6D6;
  line-height: 1.6;
}

/* General image and container responsive styles */
.page-lich-su-phat-trien img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-lich-su-phat-trien__section,
.page-lich-su-phat-trien__container {
  max-width: 100%;
  width: 100%;
  box-sizing: border-box;
}

/* Responsive styles */
@media (max-width: 1024px) {
  .page-lich-su-phat-trien__hero-container {
    flex-direction: column;
    text-align: center;
  }

  .page-lich-su-phat-trien__hero-content,
  .page-lich-su-phat-trien__hero-image {
    max-width: 100%;
    flex: none;
  }

  .page-lich-su-phat-trien__cta-buttons {
    justify-content: center;
  }

  .page-lich-su-phat-trien__main-title {
    font-size: clamp(2rem, 4.5vw, 3rem);
  }

  .page-lich-su-phat-trien__section-title {
    font-size: 1.8rem;
  }
}

@media (max-width: 768px) {
  .page-lich-su-phat-trien {
    font-size: 16px;
    line-height: 1.6;
  }

  /* HERO section */
  .page-lich-su-phat-trien__hero-section {
    padding-top: 10px !important; /* Small top padding for mobile */
    padding-bottom: 40px;
  }
  .page-lich-su-phat-trien__hero-container {
    padding: 40px 15px;
    gap: 30px;
  }
  .page-lich-su-phat-trien__main-title {
    font-size: clamp(1.8rem, 7vw, 2.5rem);
    margin-bottom: 15px;
  }
  .page-lich-su-phat-trien__hero-description {
    font-size: 1rem;
    margin-bottom: 25px;
  }
  .page-lich-su-phat-trien__cta-buttons {
    flex-direction: column;
    gap: 15px;
  }

  /* Buttons and button containers */
  .page-lich-su-phat-trien__cta-button,
  .page-lich-su-phat-trien__btn-primary,
  .page-lich-su-phat-trien__btn-secondary,
  .page-lich-su-phat-trien a[class*="button"],
  .page-lich-su-phat-trien a[class*="btn"] {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    white-space: normal !important;
    word-wrap: break-word !important;
    padding-left: 15px;
    padding-right: 15px;
  }
  .page-lich-su-phat-trien__cta-buttons,
  .page-lich-su-phat-trien__button-group,
  .page-lich-su-phat-trien__btn-container {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
    flex-wrap: wrap !important;
    gap: 10px;
  }
  .page-lich-su-phat-trien__cta-buttons {
    display: flex;
    flex-direction: column; /* Ensure vertical stacking on mobile */
  }

  /* Module 1 three-column (circular image) */
  .page-lich-su-phat-trien__intro-section {
    padding: 40px 0;
    margin-top: -40px; /* Adjust overlap for mobile */
  }
  .page-lich-su-phat-trien__icon-boxes {
    flex-direction: column;
    align-items: center;
    gap: 20px;
  }
  .page-lich-su-phat-trien__icon-box {
    max-width: 90%; /* Allow wider on mobile */
    padding: 20px;
  }
  .page-lich-su-phat-trien__icon-box-media {
    width: 150px; /* Smaller circular image for mobile */
    height: 150px;
    border-width: 2px;
  }
  .page-lich-su-phat-trien__icon-box-title {
    font-size: 1.3rem;
  }

  /* Content sections (tutorial/promo/trust/faq/blog/intro) */
  .page-lich-su-phat-trien__content-section,
  .page-lich-su-phat-trien__faq-section {
    padding: 40px 0;
  }
  .page-lich-su-phat-trien__card {
    padding: 25px;
    margin-bottom: 30px;
  }
  .page-lich-su-phat-trien__section-title {
    font-size: 1.6rem;
    margin-bottom: 25px;
  }
  .page-lich-su-phat-trien__section-description,
  .page-lich-su-phat-trien__paragraph,
  .page-lich-su-phat-trien__milestone-description,
  .page-lich-su-phat-trien__icon-box-text,
  .page-lich-su-phat-trien__faq-answer {
    font-size: 0.95rem;
  }
  .page-lich-su-phat-trien__milestone-item {
    padding: 20px 20px 20px 45px;
  }
  .page-lich-su-phat-trien__milestone-item::before {
    font-size: 20px;
    left: 10px;
    top: 18px;
  }
  .page-lich-su-phat-trien__milestone-title {
    font-size: 1.2rem;
  }

  /* FAQ */
  .page-lich-su-phat-trien__faq-item summary {
    padding: 15px 20px;
    font-size: 1.1rem;
  }
  .page-lich-su-phat-trien__faq-toggle {
    font-size: 1.5rem;
  }
  .page-lich-su-phat-trien__faq-answer {
    padding: 0 20px 15px;
  }

  /* General images */
  .page-lich-su-phat-trien img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
  }
  .page-lich-su-phat-trien__section,
  .page-lich-su-phat-trien__card,
  .page-lich-su-phat-trien__container {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
  }
}