.page-su-kien-giai-dau {
  font-family: 'Arial', sans-serif;
  color: #1F2D3D; /* Text Main */
  background-color: #F4F7FB; /* Background */
  line-height: 1.6;
}

.page-su-kien-giai-dau__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  box-sizing: border-box;
}

/* Hero Section */
.page-su-kien-giai-dau__hero-section {
  position: relative;
  padding-top: 10px; /* Small top padding, body handles header offset */
  padding-bottom: 50px;
  text-align: center;
  overflow: hidden;
  background: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%); /* Button gradient for hero background */
  color: #FFFFFF;
}

.page-su-kien-giai-dau__hero-image {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

.page-su-kien-giai-dau__hero-image img {
  width: 100%;
  height: 600px; /* Fixed height for desktop hero */
  object-fit: cover; /* Cover for desktop */
  border-radius: 10px;
}

.page-su-kien-giai-dau__hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
  padding: 30px 0;
}

.page-su-kien-giai-dau__hero-content h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem); /* Responsive font size */
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.2;
  color: #FFFFFF;
}

.page-su-kien-giai-dau__hero-content p {
  font-size: 1.15rem;
  margin-bottom: 30px;
  color: #F4F7FB; /* Lighter text for contrast */
}

.page-su-kien-giai-dau__cta-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

.page-su-kien-giai-dau__btn-primary,
.page-su-kien-giai-dau__btn-secondary {
  display: inline-block;
  padding: 15px 30px;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.3s ease;
  max-width: 100%;
  box-sizing: border-box;
  white-space: normal;
  word-wrap: break-word;
}

.page-su-kien-giai-dau__btn-primary {
  background: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%); /* Button gradient */
  color: #FFFFFF;
  border: none;
  box-shadow: 0 4px 15px rgba(47, 107, 255, 0.3);
}

.page-su-kien-giai-dau__btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(47, 107, 255, 0.4);
}

.page-su-kien-giai-dau__btn-secondary {
  background: #FFFFFF; /* Card BG */
  color: #2F6BFF; /* Main color */
  border: 2px solid #2F6BFF;
}

.page-su-kien-giai-dau__btn-secondary:hover {
  background: #E0EFFF; /* Lighter blue */
  transform: translateY(-2px);
}

/* Section General */
.page-su-kien-giai-dau__section {
  padding: 60px 0;
  background-color: #F4F7FB; /* Background */
}

.page-su-kien-giai-dau__section--dark {
  background-color: #2F6BFF; /* Main color */
  color: #FFFFFF;
}

.page-su-kien-giai-dau__section-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 40px;
  color: #1F2D3D; /* Text Main */
}

.page-su-kien-giai-dau__section--dark .page-su-kien-giai-dau__section-title {
  color: #FFFFFF;
}

.page-su-kien-giai-dau__text-block p {
  margin-bottom: 15px;
  font-size: 1rem;
  color: #1F2D3D; /* Text Main */
}

.page-su-kien-giai-dau__section--dark .page-su-kien-giai-dau__text-block p {
  color: #F4F7FB;
}

/* Event Cards Grid */
.page-su-kien-giai-dau__event-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-su-kien-giai-dau__event-card {
  background-color: #FFFFFF; /* Card BG */
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
}

.page-su-kien-giai-dau__event-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.page-su-kien-giai-dau__event-card-image {
  width: 100%;
  height: 220px; /* Fixed height for card images */
  object-fit: cover;
  display: block;
}

.page-su-kien-giai-dau__event-card-content {
  padding: 25px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.page-su-kien-giai-dau__event-card-content h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: #1F2D3D; /* Text Main */
}

.page-su-kien-giai-dau__event-card-content p {
  font-size: 0.95rem;
  color: #555;
  margin-bottom: 20px;
  flex-grow: 1;
}

.page-su-kien-giai-dau__event-card-content .page-su-kien-giai-dau__btn-primary {
  align-self: flex-start;
  padding: 10px 20px;
  font-size: 0.95rem;
}

/* How to Join Section */
.page-su-kien-giai-dau__how-to-join-steps {
  display: flex;
  justify-content: space-around;
  gap: 30px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.page-su-kien-giai-dau__step-item {
  flex: 1;
  min-width: 280px;
  background-color: #FFFFFF; /* Card BG */
  border-radius: 10px;
  padding: 30px;
  text-align: center;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease;
}

.page-su-kien-giai-dau__step-item:hover {
  transform: translateY(-5px);
}

.page-su-kien-giai-dau__step-item h3 {
  font-size: 1.4rem;
  color: #2F6BFF; /* Main color */
  margin-bottom: 15px;
}

.page-su-kien-giai-dau__step-item p {
  font-size: 1rem;
  color: #1F2D3D; /* Text Main */
}

.page-su-kien-giai-dau__how-to-join-image {
  text-align: center;
  margin-top: 40px;
}

.page-su-kien-giai-dau__how-to-join-image img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

/* FAQ Section */
.page-su-kien-giai-dau__faq-list {
  margin-top: 40px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

details.page-su-kien-giai-dau__faq-item {
  margin-bottom: 15px;
  border-radius: 5px;
  border: 1px solid #D6E2FF; /* Border color */
  overflow: hidden;
  background: #FFFFFF; /* Card BG */
}

details.page-su-kien-giai-dau__faq-item summary.page-su-kien-giai-dau__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 20px;
  cursor: pointer;
  user-select: none;
  list-style: none;
  transition: background-color 0.3s ease;
}

details.page-su-kien-giai-dau__faq-item summary.page-su-kien-giai-dau__faq-question::-webkit-details-marker {
  display: none;
}

details.page-su-kien-giai-dau__faq-item summary.page-su-kien-giai-dau__faq-question:hover {
  background: #F4F7FB; /* Lighter background */
}

.page-su-kien-giai-dau__faq-qtext {
  flex: 1;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  text-align: left;
  color: #1F2D3D; /* Text Main */
}

.page-su-kien-giai-dau__faq-toggle {
  font-size: 24px;
  font-weight: bold;
  color: #2F6BFF; /* Main color */
  flex-shrink: 0;
  margin-left: 15px;
  width: 28px;
  text-align: center;
}

details.page-su-kien-giai-dau__faq-item .page-su-kien-giai-dau__faq-answer {
  padding: 0 20px 20px;
  background: #F4F7FB; /* Background */
  border-radius: 0 0 5px 5px;
  color: #1F2D3D; /* Text Main */
}

.page-su-kien-giai-dau__faq-answer p {
  margin-bottom: 0;
}

/* Responsive Styles for 1024px */
@media (max-width: 1024px) {
  .page-su-kien-giai-dau__container {
    padding: 15px;
  }

  .page-su-kien-giai-dau__hero-image img {
    height: 500px;
  }

  .page-su-kien-giai-dau__hero-content h1 {
    font-size: 2.8rem;
  }

  .page-su-kien-giai-dau__hero-content p {
    font-size: 1.05rem;
  }

  .page-su-kien-giai-dau__btn-primary,
  .page-su-kien-giai-dau__btn-secondary {
    padding: 12px 25px;
    font-size: 1rem;
  }

  .page-su-kien-giai-dau__section-title {
    font-size: 2.2rem;
  }

  .page-su-kien-giai-dau__event-card-image {
    height: 200px;
  }

  .page-su-kien-giai-dau__event-card-content h3 {
    font-size: 1.2rem;
  }

  .page-su-kien-giai-dau__step-item {
    min-width: 250px;
  }
}

/* Responsive Styles for 768px (Mobile) */
@media (max-width: 768px) {
  .page-su-kien-giai-dau__container {
    padding-left: 15px !important;
    padding-right: 15px !important;
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

  /* HERO 主图区域 */
  .page-su-kien-giai-dau__hero-section {
    padding-top: 10px !important; /* ~10px top padding */
    padding-bottom: 30px;
  }
  .page-su-kien-giai-dau__hero-image img {
    height: auto !important; /* height auto for mobile */
    object-fit: contain !important; /* object-fit:contain */
    aspect-ratio: unset !important; /* aspect-ratio unset */
    max-width: 100% !important;
    width: 100% !important;
  }
  .page-su-kien-giai-dau__hero-content h1 {
    font-size: clamp(1.8rem, 8vw, 2.5rem);
    margin-bottom: 15px;
  }
  .page-su-kien-giai-dau__hero-content p {
    font-size: 1rem;
    margin-bottom: 20px;
  }

  /* 按钮与按钮容器 */
  .page-su-kien-giai-dau__cta-buttons {
    flex-direction: column !important; /* Vertical stack for buttons */
    gap: 15px !important;
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
  }
  .page-su-kien-giai-dau__btn-primary,
  .page-su-kien-giai-dau__btn-secondary {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    white-space: normal !important;
    word-wrap: break-word !important;
    padding: 12px 20px !important;
    font-size: 1rem !important;
  }

  /* 通用图片与容器 */
  .page-su-kien-giai-dau img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }
  .page-su-kien-giai-dau__section,
  .page-su-kien-giai-dau__card,
  .page-su-kien-giai-dau__how-to-join-image,
  .page-su-kien-giai-dau__text-block,
  .page-su-kien-giai-dau__how-to-join-steps {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
  }

  /* 产品展示图区域 (Event Grid) */
  .page-su-kien-giai-dau__event-grid {
    grid-template-columns: 1fr 1fr; /* 2 columns for mobile */
    gap: 20px;
    overflow-x: hidden !important; /* Prevent horizontal scroll */
  }
  .page-su-kien-giai-dau__event-card {
    min-width: unset;
  }
  .page-su-kien-giai-dau__event-card-image {
    height: 180px;
  }
  .page-su-kien-giai-dau__event-card-content h3 {
    font-size: 1.1rem;
  }
  .page-su-kien-giai-dau__event-card-content p {
    font-size: 0.9rem;
  }

  /* 装饰主标题 + 长文 SEO 区 */
  .page-su-kien-giai-dau__section-title {
    font-size: clamp(1.5rem, 7vw, 2rem);
    margin-bottom: 30px;
    text-align: center;
    max-width: 100%;
    word-wrap: break-word;
  }
  .page-su-kien-giai-dau__text-block p {
    font-size: 0.95rem;
  }
  .page-su-kien-giai-dau__step-item {
    min-width: unset;
    padding: 20px;
  }
  .page-su-kien-giai-dau__step-item h3 {
    font-size: 1.2rem;
  }

  /* FAQ */
  details.page-su-kien-giai-dau__faq-item summary.page-su-kien-giai-dau__faq-question {
    padding: 15px;
  }
  .page-su-kien-giai-dau__faq-qtext {
    font-size: 15px;
  }
  details.page-su-kien-giai-dau__faq-item .page-su-kien-giai-dau__faq-answer {
    padding: 0 15px 15px;
  }
}