/* style/bnc.css */
:root {
  --bnc-primary-color: #11A84E;
  --bnc-secondary-color: #22C768;
  --bnc-background-dark: #08160F;
  --bnc-card-background: #11271B;
  --bnc-text-main: #F2FFF6;
  --bnc-text-secondary: #A7D9B8;
  --bnc-button-gradient: linear-gradient(180deg, #2AD16F 0%, #13994A 100%);
  --bnc-border-color: #2E7A4E;
  --bnc-glow-color: #57E38D;
  --bnc-gold-color: #F2C14E;
  --bnc-divider-color: #1E3A2A;
  --bnc-deep-green: #0A4B2C;
}

/* body 已 padding-top: var(--header-offset)；页面禁止再写该变量 */
.page-bnc {
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  color: var(--bnc-text-main); /* Default text color for dark background */
  background-color: var(--bnc-background-dark);
}

.page-bnc__hero-section {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 60px 20px;
  padding-top: 10px; /* Small top padding for visual spacing, body handles header offset */
  text-align: center;
  background: var(--bnc-background-dark);
  color: var(--bnc-text-main);
  overflow: hidden;
}

.page-bnc__video-container {
  width: 100%; /* Desktop width */
  max-width: 1200px;
  margin: 0 auto 30px auto;
  box-sizing: border-box;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
}

.page-bnc__video {
  width: 100%;
  height: auto;
  display: block;
}

.page-bnc__hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.page-bnc__main-title {
  font-size: clamp(2.2em, 4vw, 3.5em); /* Responsive font size */
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--bnc-gold-color);
  text-shadow: 0 0 10px rgba(242, 193, 78, 0.5);
}

.page-bnc__description {
  font-size: 1.1em;
  margin-bottom: 30px;
  color: var(--bnc-text-secondary);
}

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

.page-bnc__cta-buttons--center {
  margin-top: 40px;
}

.page-bnc__btn-primary,
.page-bnc__btn-secondary {
  display: inline-block;
  padding: 15px 30px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 700;
  transition: all 0.3s ease;
  white-space: normal;
  word-wrap: break-word;
  box-sizing: border-box;
  max-width: 100%;
}

.page-bnc__btn-primary {
  background: var(--bnc-button-gradient);
  color: var(--bnc-text-main);
  border: 2px solid transparent;
  box-shadow: 0 5px 15px rgba(42, 209, 111, 0.4);
}

.page-bnc__btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(42, 209, 111, 0.6);
}

.page-bnc__btn-secondary {
  background: transparent;
  color: var(--bnc-primary-color);
  border: 2px solid var(--bnc-primary-color);
  box-shadow: 0 5px 15px rgba(17, 168, 78, 0.2);
}

.page-bnc__btn-secondary:hover {
  background: var(--bnc-primary-color);
  color: var(--bnc-text-main);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(17, 168, 78, 0.4);
}

.page-bnc__introduction-section,
.page-bnc__how-to-play-section,
.page-bnc__faq-section {
  background-color: var(--bnc-background-dark);
  color: var(--bnc-text-main);
  padding: 80px 20px;
}

.page-bnc__features-section,
.page-bnc__promotions-section,
.page-bnc__cta-final-section {
  background-color: var(--bnc-card-background);
  color: var(--bnc-text-main);
  padding: 80px 20px;
}

.page-bnc__light-bg {
  background-color: var(--bnc-background-dark);
  color: var(--bnc-text-main);
}

.page-bnc__dark-bg {
  background-color: var(--bnc-card-background);
  color: var(--bnc-text-main);
}

.page-bnc__content-area {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0;
}

.page-bnc__section-title {
  font-size: clamp(1.8em, 3vw, 2.8em);
  font-weight: 700;
  margin-bottom: 40px;
  text-align: center;
  color: var(--bnc-gold-color);
}

.page-bnc__text-block {
  font-size: 1.05em;
  margin-bottom: 20px;
  line-height: 1.7;
  color: var(--bnc-text-secondary);
}

.page-bnc__text-main {
  color: var(--bnc-text-main);
}

.page-bnc__text-secondary {
  color: var(--bnc-text-secondary);
}

.page-bnc__image {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 30px auto;
  border-radius: 10px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

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

.page-bnc__feature-card,
.page-bnc__promo-card {
  background-color: var(--bnc-card-background);
  border: 1px solid var(--bnc-border-color);
  border-radius: 15px;
  padding: 30px;
  text-align: center;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-bnc__feature-card:hover,
.page-bnc__promo-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.page-bnc__card-icon {
  width: 100px;
  height: 100px;
  object-fit: contain;
  margin-bottom: 20px;
  filter: drop-shadow(0 0 10px var(--bnc-glow-color));
}

.page-bnc__promo-image {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  margin-bottom: 20px;
  display: block;
}

.page-bnc__card-title {
  font-size: 1.4em;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--bnc-text-main);
}

.page-bnc__card-text {
  font-size: 0.95em;
  color: var(--bnc-text-secondary);
  line-height: 1.6;
  flex-grow: 1;
}

.page-bnc__step-by-step {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  margin-top: 40px;
}

.page-bnc__step-card {
  background-color: var(--bnc-card-background);
  border: 1px solid var(--bnc-border-color);
  border-radius: 15px;
  padding: 30px;
  text-align: center;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  flex: 1 1 calc(33% - 40px); /* 3 cards per row */
  max-width: calc(33% - 40px);
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-bnc__step-image {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  margin-bottom: 20px;
  display: block;
}

.page-bnc__step-title {
  font-size: 1.3em;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--bnc-text-main);
}

.page-bnc__step-text {
  font-size: 0.95em;
  color: var(--bnc-text-secondary);
  line-height: 1.6;
}

.page-bnc__faq-section {
  padding-bottom: 80px;
}

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

.page-bnc__faq-item {
  background-color: var(--bnc-card-background);
  border: 1px solid var(--bnc-border-color);
  border-radius: 10px;
  margin-bottom: 15px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.page-bnc__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 25px;
  font-size: 1.15em;
  font-weight: 600;
  color: var(--bnc-text-main);
  cursor: pointer;
  background-color: var(--bnc-deep-green);
  border-bottom: 1px solid var(--bnc-border-color);
  transition: background-color 0.3s ease;
}

.page-bnc__faq-question::-webkit-details-marker {
  display: none;
}

.page-bnc__faq-question::marker {
  display: none;
}

.page-bnc__faq-item[open] > .page-bnc__faq-question {
  background-color: var(--bnc-primary-color);
  border-bottom-color: transparent;
}

.page-bnc__faq-qtext {
  flex-grow: 1;
}

.page-bnc__faq-toggle {
  font-size: 1.5em;
  line-height: 1;
  margin-left: 20px;
  color: var(--bnc-gold-color);
}

.page-bnc__faq-item[open] .page-bnc__faq-toggle {
  color: var(--bnc-text-main);
}

.page-bnc__faq-answer {
  padding: 20px 25px;
  font-size: 1em;
  color: var(--bnc-text-secondary);
  line-height: 1.7;
  background-color: var(--bnc-card-background);
}

.page-bnc__cta-final-section {
  padding-top: 60px;
  padding-bottom: 100px;
  text-align: center;
}

/* Responsive Styles */
@media (max-width: 1024px) {
  .page-bnc__step-card {
    flex: 1 1 calc(50% - 20px);
    max-width: calc(50% - 20px);
  }
}

@media (max-width: 768px) {
  .page-bnc__hero-section {
    padding: 40px 15px;
    padding-top: 10px !important;
  }

  .page-bnc__main-title {
    font-size: 2.2em;
  }

  .page-bnc__description {
    font-size: 1em;
  }

  .page-bnc__cta-buttons {
    flex-direction: column;
    gap: 15px;
    width: 100%;
    padding: 0 15px;
  }

  .page-bnc__btn-primary,
  .page-bnc__btn-secondary {
    width: 100% !important;
    max-width: 100% !important;
    padding: 12px 20px;
    font-size: 1em;
    box-sizing: border-box !important;
    white-space: normal !important;
    word-wrap: break-word !important;
  }

  .page-bnc__introduction-section,
  .page-bnc__features-section,
  .page-bnc__how-to-play-section,
  .page-bnc__promotions-section,
  .page-bnc__faq-section,
  .page-bnc__cta-final-section {
    padding: 50px 15px;
  }

  .page-bnc__section-title {
    font-size: 1.8em;
    margin-bottom: 30px;
  }

  .page-bnc__text-block {
    font-size: 0.95em;
  }

  .page-bnc__feature-grid,
  .page-bnc__promo-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-bnc__feature-card,
  .page-bnc__promo-card,
  .page-bnc__step-card {
    flex: 1 1 100%;
    max-width: 100%;
    padding: 25px;
  }

  .page-bnc__card-icon {
    width: 80px;
    height: 80px;
  }

  .page-bnc__card-title {
    font-size: 1.2em;
  }

  .page-bnc__faq-question {
    font-size: 1em;
    padding: 15px 20px;
  }

  .page-bnc__faq-answer {
    padding: 15px 20px;
    font-size: 0.95em;
  }

  /* Mobile image and video responsive adaptation */
  .page-bnc img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }
  
  .page-bnc video,
  .page-bnc__video {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }
  
  .page-bnc__section,
  .page-bnc__card,
  .page-bnc__container,
  .page-bnc__video-section,
  .page-bnc__video-container,
  .page-bnc__video-wrapper,
  .page-bnc__cta-buttons,
  .page-bnc__button-group,
  .page-bnc__btn-container,
  .page-bnc__introduction-section,
  .page-bnc__features-section,
  .page-bnc__how-to-play-section,
  .page-bnc__promotions-section,
  .page-bnc__faq-section,
  .page-bnc__cta-final-section,
  .page-bnc__content-area {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
    overflow: hidden !important;
  }
  .page-bnc__hero-section .page-bnc__content-area {
    padding-left: 0;
    padding-right: 0;
  }
  .page-bnc__cta-buttons {
    flex-wrap: wrap !important;
    gap: 10px;
  }
}

@media (max-width: 480px) {
  .page-bnc__main-title {
    font-size: 1.8em;
  }
  .page-bnc__section-title {
    font-size: 1.5em;
  }
  .page-bnc__cta-buttons {
    flex-direction: column;
  }
}