:root {
  --main-color: #11A84E; /* 主色调 */
  --secondary-color: #22C768; /* 辅助色 */
  --button-gradient: linear-gradient(180deg, #2AD16F 0%, #13994A 100%); /* 按钮 */
  --card-b-g: #11271B; /* Card BG */
  --background: #08160F; /* 背景 */
  --text-main: #F2FFF6; /* Text Main */
  --text-secondary: #A7D9B8; /* Text Secondary */
  --border: #2E7A4E; /* 边框 */
  --glow: #57E38D; /* Glow */
  --gold: #F2C14E; /* Gold */
  --divider: #1E3A2A; /* Divider */
  --deep-green: #0A4B2C; /* Deep Green */
}

/* style/support.css */
/* body đã padding-top: var(--header-offset) từ shared.css; trang này không được thêm padding-top cho body hoặc các section đầu tiên bằng biến này */

.page-support {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-main); /* Default text color for the page */
  background-color: var(--background); /* Default background for the page */
}

/* Hero Section */
.page-support__hero-section {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column; /* Ensure image is above content */
  align-items: center;
  padding: 60px 20px;
  padding-top: 10px; /* Small top padding, body handles --header-offset */
  text-align: center;
  overflow: hidden; /* Prevent content overflow */
  background: linear-gradient(180deg, var(--deep-green) 0%, var(--background) 100%); /* Example dark background */
}

.page-support__hero-image-wrapper {
  width: 100%;
  max-width: 100%; /* Ensure wrapper is responsive */
  margin-bottom: 30px; /* Space between image and content */
  box-sizing: border-box;
}

.page-support__hero-image {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
  object-fit: cover;
  width: 1200px; /* HTML width attribute */
  height: 675px; /* HTML height attribute */
}

.page-support__hero-content {
  max-width: 800px;
  margin: 0 auto;
  color: var(--text-main); /* Light text on dark background */
}

.page-support__main-title {
  font-size: clamp(2em, 4vw, 3em); /* Responsive font size for H1 */
  font-weight: bold;
  margin-bottom: 20px;
  color: var(--text-main); /* Light text on dark background */
  line-height: 1.2;
}

.page-support__description {
  font-size: 1.1em;
  margin-bottom: 30px;
  color: var(--text-secondary); /* Slightly less prominent light text */
}

/* CTA Buttons */
.page-support__cta-buttons {
  display: flex;
  flex-wrap: wrap; /* Allow buttons to wrap on smaller screens */
  justify-content: center;
  gap: 15px;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

.page-support__cta-buttons--center {
  justify-content: center;
}

.page-support__btn-primary,
.page-support__btn-secondary {
  display: inline-block;
  padding: 12px 25px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  transition: background-color 0.3s ease, transform 0.2s ease;
  white-space: normal; /* Allow text to wrap */
  word-wrap: break-word; /* Break long words */
  max-width: 100%; /* Ensure button is responsive */
  box-sizing: border-box;
  text-align: center;
}

.page-support__btn-primary {
  background: var(--button-gradient);
  color: #ffffff;
  border: 2px solid transparent;
}

.page-support__btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.page-support__btn-secondary {
  background-color: transparent;
  color: var(--text-main);
  border: 2px solid var(--border);
}

.page-support__btn-secondary:hover {
  background-color: var(--border);
  color: var(--text-main);
  transform: translateY(-2px);
}

.page-support__btn-small {
  padding: 8px 15px;
  font-size: 0.9em;
}

/* General Sections */
.page-support__introduction-section,
.page-support__troubleshooting-section,
.page-support__tips-section {
  background-color: var(--background); /* Dark background for these sections */
  color: var(--text-main); /* Light text on dark background */
  padding: 40px 20px;
}

.page-support__channels-section,
.page-support__faq-section,
.page-support__conclusion-section {
  background-color: var(--card-b-g); /* Darker background for these sections */
  color: var(--text-main); /* Light text on dark background */
  padding: 40px 20px;
}

.page-support__container {
  max-width: 1200px;
  margin: 0 auto;
  box-sizing: border-box;
}

.page-support__section-title {
  font-size: clamp(1.8em, 3vw, 2.5em);
  font-weight: bold;
  margin-bottom: 30px;
  text-align: center;
  color: var(--text-main);
}

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

.page-support__text-link {
  color: var(--main-color); /* Brand color for links */
  text-decoration: underline;
}

.page-support__text-link:hover {
  color: var(--gold);
}

/* Channels Grid */
.page-support__channels-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
  margin-top: 30px;
}

.page-support__channel-card.page-support__card {
  background-color: var(--deep-green); /* Slightly lighter dark card background */
  border-radius: 10px;
  padding: 25px;
  text-align: center;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: var(--text-main);
}

.page-support__card-image {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto 15px;
  border-radius: 5px;
}

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

.page-support__card-text {
  font-size: 1em;
  line-height: 1.6;
  color: var(--text-secondary);
  flex-grow: 1; /* Push button to bottom */
  margin-bottom: 20px;
}

.page-support__note-text {
  font-style: italic;
  font-size: 0.9em;
  margin-top: 30px;
  text-align: center;
  color: var(--text-secondary);
}

/* Troubleshooting Section */
.page-support__issue-category {
  margin-bottom: 40px;
  background-color: var(--card-b-g); /* Use a dark background for categories for contrast */
  padding: 25px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.page-support__category-title {
  font-size: 1.6em;
  font-weight: bold;
  margin-bottom: 20px;
  color: var(--gold); /* Highlight category titles */
  text-align: center;
}

.page-support__issue-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.page-support__issue-list li {
  margin-bottom: 15px;
  padding-left: 25px;
  position: relative;
  color: var(--text-secondary);
}

.page-support__issue-list li::before {
  content: '👉'; /* Unicode arrow for list items */
  position: absolute;
  left: 0;
  color: var(--main-color);
}

.page-support__issue-list li strong {
  color: var(--text-main);
}

/* FAQ Section */
.page-support__faq-list {
  margin-top: 30px;
}

.page-support__faq-item {
  background-color: var(--deep-green); /* Darker background for FAQ items */
  border-radius: 8px;
  margin-bottom: 15px;
  overflow: hidden;
  color: var(--text-main);
}

.page-support__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 25px;
  font-size: 1.15em;
  font-weight: bold;
  cursor: pointer;
  background-color: var(--deep-green);
  color: var(--text-main);
  border-bottom: 1px solid var(--divider);
  transition: background-color 0.3s ease;
}

.page-support__faq-question:hover {
  background-color: rgba(var(--main-color), 0.2); /* Slight hover effect */
}

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

.page-support__faq-toggle {
  font-size: 1.5em;
  line-height: 1;
  margin-left: 15px;
  transition: transform 0.3s ease;
  color: var(--gold);
}

.page-support__faq-item[open] .page-support__faq-toggle {
  transform: rotate(45deg); /* Rotate for 'x' effect */
}

/* Hide default details marker */
.page-support__faq-item summary {
  list-style: none;
}
.page-support__faq-item summary::-webkit-details-marker {
  display: none;
}


.page-support__faq-answer {
  padding: 15px 25px 25px;
  background-color: var(--card-b-g); /* Lighter dark background for answer */
  font-size: 1em;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-support__faq-answer p {
  margin-bottom: 15px;
  color: var(--text-secondary);
}

.page-support__faq-answer .page-support__btn-primary,
.page-support__faq-answer .page-support__btn-secondary {
  margin-top: 10px;
  display: inline-block;
}


/* Tips Section */
.page-support__tip-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.page-support__tip-list li {
  margin-bottom: 15px;
  padding-left: 30px;
  position: relative;
  font-size: 1.05em;
  color: var(--text-secondary);
}

.page-support__tip-list li::before {
  content: '✅'; /* Checkmark for tips */
  position: absolute;
  left: 0;
  color: var(--main-color);
}

.page-support__tip-list li strong {
  color: var(--text-main);
}


/* Responsive Design */
@media (max-width: 1024px) {
  .page-support__hero-section {
    padding: 40px 15px;
  }
  .page-support__hero-image {
    width: 1000px; /* Adjust HTML width/height for common tablet sizes if needed, or rely on max-width:100% */
    height: 563px;
  }
  .page-support__main-title {
    font-size: clamp(1.8em, 4.5vw, 2.8em);
  }
  .page-support__description {
    font-size: 1em;
  }
  .page-support__section-title {
    font-size: clamp(1.6em, 3.5vw, 2.2em);
  }
}

@media (max-width: 768px) {
  .page-support__hero-section {
    padding: 30px 15px;
    padding-top: 10px !important; /* body already handles --header-offset */
  }
  .page-support__hero-image-wrapper,
  .page-support__container,
  .page-support__channels-section,
  .page-support__faq-section,
  .page-support__conclusion-section,
  .page-support__introduction-section,
  .page-support__troubleshooting-section,
  .page-support__tips-section {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
    overflow: hidden !important; /* Prevent content overflow */
  }

  .page-support__hero-image {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }

  .page-support img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }

  .page-support__cta-buttons {
    flex-direction: column; /* Stack buttons vertically */
    gap: 10px;
  }

  .page-support__btn-primary,
  .page-support__btn-secondary,
  .page-support a[class*="button"],
  .page-support 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-support__cta-buttons,
  .page-support__button-group,
  .page-support__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-support__main-title {
    font-size: 2em;
  }
  .page-support__description {
    font-size: 0.95em;
  }
  .page-support__section-title {
    font-size: 1.5em;
  }

  .page-support__channels-grid {
    grid-template-columns: 1fr; /* Single column layout */
  }

  .page-support__issue-list li,
  .page-support__tip-list li {
    padding-left: 20px;
  }
  .page-support__issue-list li::before,
  .page-support__tip-list li::before {
    left: -5px;
  }

  .page-support__faq-question {
    font-size: 1em;
    padding: 15px 20px;
  }
  .page-support__faq-answer {
    padding: 10px 20px 20px;
  }

  /* Ensure video elements are also responsive */
  .page-support video,
  .page-support__video {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }

  .page-support__video-section,
  .page-support__video-container,
  .page-support__video-wrapper {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
    overflow: hidden !important;
  }
}

/* Contrast Fixes */
/* The sections implicitly handle contrast by using var(--background) or var(--card-b-g) for background
   and var(--text-main) or var(--text-secondary) for text, which are designed for contrast. */
/* Example for specific dark/light background sections if needed */
.page-support__introduction-section,
.page-support__troubleshooting-section,
.page-support__tips-section {
  background-color: var(--background);
  color: var(--text-main);
}
.page-support__channels-section,
.page-support__faq-section,
.page-support__conclusion-section {
  background-color: var(--card-b-g);
  color: var(--text-main);
}

/* Ensure all images maintain original color */
.page-support img {
  filter: none !important; /* Ensure no filters are applied */
}