.page-khuyen-mai {
  color: #F2FFF6; /* Text Main */
  background-color: #08160F; /* Background */
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  padding-bottom: 40px;
}

.page-khuyen-mai__top-section {
  padding-top: 10px; /* Rely on body padding for main offset */
  padding-bottom: 40px;
  text-align: center;
  background-color: #08160F; /* Background */
}

.page-khuyen-mai__main-title {
  font-size: clamp(2em, 5vw, 3em); /* H1 font size constraint */
  font-weight: 700;
  color: #F2FFF6; /* Text Main */
  margin-bottom: 15px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.page-khuyen-mai__intro-text {
  font-size: 1.1em;
  color: #A7D9B8; /* Text Secondary */
  max-width: 800px;
  margin: 0 auto 30px auto;
}

.page-khuyen-mai__cta-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 30px;
  flex-wrap: wrap; /* For mobile */
}

.page-khuyen-mai__btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 8px;
  font-weight: 700;
  text-decoration: none;
  transition: background-color 0.3s ease, opacity 0.3s ease;
  max-width: 100%; /* Button responsive constraint */
  box-sizing: border-box; /* Button responsive constraint */
  white-space: normal; /* Button responsive constraint */
  word-wrap: break-word; /* Button responsive constraint */
  text-align: center;
}

.page-khuyen-mai__btn--primary {
  background: linear-gradient(180deg, #2AD16F 0%, #13994A 100%); /* Button color */
  color: #ffffff;
  border: none;
}

.page-khuyen-mai__btn--primary:hover {
  opacity: 0.9;
}

.page-khuyen-mai__btn--secondary {
  background: transparent;
  color: #2AD16F; /* Button color */
  border: 2px solid #2AD16F;
}

.page-khuyen-mai__btn--secondary:hover {
  background: rgba(42, 209, 111, 0.1);
}

.page-khuyen-mai__content-wrapper {
  max-width: 1150px;
  margin: 0 auto;
  padding: 0 20px;
}

.page-khuyen-mai__section {
  background-color: #11271B; /* Card BG */
  border-radius: 10px;
  padding: 30px;
  margin-bottom: 30px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  border: 1px solid #2E7A4E; /* Border */
}

.page-khuyen-mai__section-title {
  font-size: 2em;
  color: #F2FFF6; /* Text Main */
  margin-bottom: 20px;
  text-align: center;
  font-weight: 600;
}

.page-khuyen-mai__subsection-title {
  font-size: 1.5em;
  color: #22C768; /* Auxiliary color */
  margin-top: 25px;
  margin-bottom: 15px;
  font-weight: 600;
}

.page-khuyen-mai p {
  margin-bottom: 15px;
  color: #A7D9B8; /* Text Secondary */
}

.page-khuyen-mai p a {
  color: #2AD16F; /* Link color */
  text-decoration: underline;
}

.page-khuyen-mai p a:hover {
  color: #57E38D;
}

.page-khuyen-mai ul {
  list-style: disc;
  margin-bottom: 15px;
  padding-left: 40px;
}

.page-khuyen-mai ul li {
  margin-bottom: 8px;
  color: #A7D9B8; /* Text Secondary */
}

.page-khuyen-mai__image-container {
  text-align: center;
  margin: 30px auto;
  max-width: 100%;
  overflow: hidden;
  box-sizing: border-box;
}

.page-khuyen-mai__image-container img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  display: block; /* Important for responsive images */
  margin: 0 auto;
  border: 1px solid #2E7A4E; /* Border */
}

.page-khuyen-mai__info-card {
  background-color: #0A4B2C; /* Deep Green */
  border-left: 5px solid #57E38D; /* Glow */
  padding: 20px;
  margin: 25px 0;
  border-radius: 8px;
  color: #F2FFF6;
}

.page-khuyen-mai__info-card p {
  color: #F2FFF6;
  margin-bottom: 0;
}

.page-khuyen-mai__info-card a {
  color: #57E38D;
  text-decoration: underline;
}

.page-khuyen-mai__info-card a:hover {
  color: #F2FFF6;
}

.page-khuyen-mai__faq-item {
  background-color: #11271B; /* Card BG */
  border: 1px solid #2E7A4E; /* Border */
  border-radius: 8px;
  margin-bottom: 15px;
}

.page-khuyen-mai__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  cursor: pointer;
  color: #F2FFF6; /* Text Main */
  font-weight: 600;
  position: relative;
  list-style: none; /* For <summary> */
}

.page-khuyen-mai__faq-question::-webkit-details-marker {
  display: none; /* Hide default marker for <summary> */
}
.page-khuyen-mai__faq-question::marker {
  display: none; /* Hide default marker for <summary> */
}

.page-khuyen-mai__faq-toggle {
  font-size: 1.5em;
  line-height: 1;
  transition: transform 0.3s ease;
  color: #2AD16F;
}

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

.page-khuyen-mai__faq-answer {
  padding: 0 20px 15px 20px;
  color: #A7D9B8; /* Text Secondary */
  line-height: 1.7;
}

.page-khuyen-mai__divider {
  border: none;
  border-top: 1px solid #1E3A2A; /* Divider */
  margin: 40px 0;
}

.page-khuyen-mai__final-cta {
  text-align: center;
  margin-top: 50px;
}

/* --- Responsive Styles --- */

/* @media (max-width: 1024px) - For tablets and smaller desktops */
@media (max-width: 1024px) {
  .page-khuyen-mai__main-title {
    font-size: clamp(1.8em, 4vw, 2.5em);
  }
  .page-khuyen-mai__intro-text {
    font-size: 1em;
    padding: 0 15px;
  }
  .page-khuyen-mai__section {
    padding: 25px;
    margin-bottom: 25px;
  }
  .page-khuyen-mai__section-title {
    font-size: 1.8em;
  }
  .page-khuyen-mai__subsection-title {
    font-size: 1.3em;
  }
  .page-khuyen-mai ul {
    padding-left: 30px;
  }
}

/* @media (max-width: 768px) - Mobile styles (必写清单) */
@media (max-width: 768px) {
  /* 1. 顶区标题 + 双 CTA */
  .page-khuyen-mai__top-section {
    padding-top: 10px !important;
    padding-bottom: 30px;
  }

  .page-khuyen-mai__main-title {
    font-size: clamp(1.5em, 8vw, 2em) !important;
    padding: 0 10px;
  }

  .page-khuyen-mai__intro-text {
    font-size: 0.95em !important;
    padding: 0 15px;
  }

  .page-khuyen-mai__cta-buttons {
    flex-direction: column !important;
    gap: 15px;
    padding: 0 15px;
  }

  .page-khuyen-mai__btn {
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
    padding: 12px 15px !important;
    white-space: normal !important;
    word-wrap: break-word !important;
  }

  /* 2. 单栏长文容器 */
  .page-khuyen-mai__content-wrapper {
    padding: 0 15px !important;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
  }

  .page-khuyen-mai__section {
    padding: 20px !important;
    margin-bottom: 20px !important;
  }

  .page-khuyen-mai__section-title {
    font-size: 1.6em !important;
    text-align: left;
  }

  .page-khuyen-mai__subsection-title {
    font-size: 1.2em !important;
    margin-top: 20px !important;
    margin-bottom: 10px !important;
  }

  .page-khuyen-mai p,
  .page-khuyen-mai ul li {
    font-size: 0.9em !important;
    line-height: 1.5 !important;
  }
  .page-khuyen-mai ul {
    padding-left: 20px !important;
  }

  /* 3. 通用图片与 figure */
  .page-khuyen-mai img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }

  .page-khuyen-mai__image-container {
    padding: 0 10px;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
  }

  /* 4. 按钮与按钮容器 (covered in top-section and general .page-khuyen-mai__btn) */
  /* Additional specific rule for button containers in mobile */
  .page-khuyen-mai__cta-buttons {
    flex-wrap: wrap !important;
    gap: 10px;
  }

  /* 5. 注册教程与 FAQ 区块 */
  .page-khuyen-mai__faq-question {
    font-size: 1em !important;
    padding: 12px 15px !important;
  }

  .page-khuyen-mai__faq-answer {
    font-size: 0.9em !important;
    padding: 0 15px 12px 15px !important;
  }

  .page-khuyen-mai__info-card {
    padding: 15px !important;
    margin: 20px 0 !important;
  }
}