:root {
  --primary-color: #C91F17; /* Main Red */
  --secondary-color: #E53935; /* Auxiliary Red */
  --button-gradient: linear-gradient(180deg, #FFD86A 0%, #E6B800 100%); /* Button Gold Gradient */
  --card-bg: #D32F2F; /* Card Background Red */
  --section-bg: #B71C1C; /* Section Background Deep Red */
  --text-main-color: #FFF5E1; /* Main Text Light Yellow */
  --border-color: #F2B544; /* Border Gold */
  --glow-color: #FFCC66; /* Glow Yellow */
  --gold-color: #F4D34D; /* Pure Gold */
  --deep-red-color: #7A0E0E; /* Deep Red */
  --dark-text: #333333; /* For light backgrounds */
  --light-text: #ffffff; /* For dark backgrounds */
}

/* General page styling */
.page-download {
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  color: var(--text-main-color); /* Assuming a dark body background from custom colors */
  background-color: var(--section-bg); /* Use a dark background from custom colors for consistency */
}

.page-download__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.page-download__container--center {
  text-align: center;
}

/* Hero Section */
.page-download__hero-section {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 20px;
  /* ☠️ 页头由 shared 的 body { padding-top: var(--header-offset); } 承担；此处仅用小额顶距，禁止 var(--header-offset) 以免双倍空白 */
  padding-top: 10px;
  background-color: var(--deep-red-color); /* Darker background for hero */
}

.page-download__hero-container {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.page-download__hero-image {
  width: 100%;
  margin-bottom: 30px;
}

.page-download__hero-image img {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}

.page-download__hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  width: 100%;
  color: var(--text-main-color);
}

.page-download__main-title {
  /* ☠️ H1 字号：不写死 font-size */
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--gold-color);
  margin-bottom: 20px;
  /* Use clamp for responsive font-size, adhering to the rule */
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.page-download__hero-description {
  font-size: 1.15rem;
  margin-bottom: 30px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  color: var(--text-main-color);
}

.page-download__cta-button {
  display: inline-block;
  padding: 15px 40px;
  background: var(--button-gradient);
  color: var(--dark-text); /* Ensure dark text on gold button */
  text-decoration: none;
  border-radius: 8px;
  font-size: 1.25rem;
  font-weight: bold;
  margin-top: 30px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  border: 2px solid var(--border-color);
}

.page-download__cta-button:hover {
  background: linear-gradient(180deg, #E6B800 0%, #FFD86A 100%); /* Invert gradient on hover */
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

.page-download__cta-button--large {
  padding: 18px 50px;
  font-size: 1.4rem;
  margin-top: 40px;
}

.page-download__cta-button--final {
  margin-bottom: 60px;
}

/* General Section Styles */
.page-download__section {
  padding: 80px 0;
  background-color: var(--section-bg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.page-download__section:nth-of-type(even) {
  background-color: var(--deep-red-color);
}

.page-download__section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  color: var(--gold-color);
  text-align: center;
  margin-bottom: 40px;
  font-weight: 700;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
}

.page-download__section-description {
  font-size: 1.05rem;
  text-align: center;
  max-width: 900px;
  margin: 0 auto 50px auto;
  color: var(--text-main-color);
}

/* Why Download Section */
.page-download__why-download .page-download__features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.page-download__feature-item {
  background-color: var(--card-bg);
  padding: 30px;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid var(--border-color);
}

.page-download__feature-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.page-download__feature-item img {
  width: 100%;
  height: auto;
  max-width: 400px; /* Recommended size */
  margin-bottom: 20px;
  border-radius: 8px;
  object-fit: cover;
}

.page-download__feature-title {
  font-size: 1.5rem;
  color: var(--gold-color);
  margin-bottom: 15px;
  font-weight: 600;
}

.page-download__feature-item p {
  color: var(--text-main-color);
  font-size: 1rem;
}

/* How To Download Section */
.page-download__how-to-download .page-download__steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.page-download__step-item {
  background-color: var(--card-bg);
  padding: 30px;
  border-radius: 12px;
  text-align: left;
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  position: relative;
  counter-increment: step-counter;
}

.page-download__step-number {
  position: absolute;
  top: 15px;
  left: 15px;
  width: 40px;
  height: 40px;
  background-color: var(--gold-color);
  color: var(--dark-text);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: bold;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.page-download__step-item img {
  width: 100%;
  height: auto;
  max-width: 400px; /* Recommended size */
  margin-top: 20px;
  border-radius: 8px;
  object-fit: cover;
}

.page-download__step-title {
  font-size: 1.4rem;
  color: var(--gold-color);
  margin-bottom: 15px;
  margin-top: 0;
  padding-left: 55px; /* Space for step number */
  font-weight: 600;
}

.page-download__step-item p {
  color: var(--text-main-color);
  font-size: 1rem;
}

.page-download__download-cta-bottom {
  text-align: center;
  margin-top: 60px;
}

/* App Features Section */
.page-download__app-features .page-download__features-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.page-download__feature-card {
  background-color: var(--card-bg);
  padding: 30px;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
}

.page-download__feature-card img {
  width: 100%;
  height: auto;
  max-width: 400px; /* Recommended size */
  margin-bottom: 20px;
  border-radius: 8px;
  object-fit: cover;
}

.page-download__feature-card-title {
  font-size: 1.5rem;
  color: var(--gold-color);
  margin-bottom: 15px;
  font-weight: 600;
}

.page-download__feature-card p {
  color: var(--text-main-color);
  font-size: 1rem;
}

/* System Requirements Section */
.page-download__system-requirements .page-download__requirements-list {
  list-style: none;
  padding: 0;
  margin: 50px auto;
  max-width: 700px;
  background-color: var(--card-bg);
  border-radius: 12px;
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
}

.page-download__system-requirements .page-download__requirements-list li {
  padding: 15px 25px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 1.05rem;
  color: var(--text-main-color);
  display: flex;
  align-items: center;
}

.page-download__system-requirements .page-download__requirements-list li:last-child {
  border-bottom: none;
}

.page-download__system-requirements .page-download__requirements-list li strong {
  color: var(--gold-color);
  margin-right: 10px;
  flex-shrink: 0;
}

/* FAQ Section */
.page-download__faq-section {
  padding-bottom: 80px; /* Adjust padding for FAQ */
}

details.page-download__faq-item {
  margin-bottom: 15px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  background: var(--card-bg);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}
details.page-download__faq-item summary.page-download__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 25px;
  cursor: pointer;
  user-select: none;
  list-style: none;
  transition: background-color 0.3s ease;
  color: var(--gold-color);
  font-weight: 600;
}
details.page-download__faq-item summary.page-download__faq-question::-webkit-details-marker {
  display: none;
}
details.page-download__faq-item summary.page-download__faq-question:hover {
  background: var(--deep-red-color);
}
.page-download__faq-qtext {
  flex: 1;
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.5;
  text-align: left;
  color: var(--gold-color);
}
.page-download__faq-toggle {
  font-size: 24px;
  font-weight: bold;
  color: var(--text-main-color);
  flex-shrink: 0;
  margin-left: 15px;
  width: 28px;
  text-align: center;
  transition: transform 0.3s ease;
}
details.page-download__faq-item[open] .page-download__faq-toggle {
  transform: rotate(45deg); /* Change + to X or rotate it */
}
details.page-download__faq-item .page-download__faq-answer {
  padding: 0 25px 25px;
  background: var(--deep-red-color); /* Slightly different dark background for answer */
  border-radius: 0 0 12px 12px;
  color: var(--text-main-color);
  font-size: 1rem;
}

/* Final CTA Section */
.page-download__final-cta {
  text-align: center;
  padding-top: 60px;
  padding-bottom: 100px;
  background-color: var(--deep-red-color);
}

/* Global Image and Button Responsive Styles */
/* All images base responsive style */
.page-download img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* All buttons base responsive style */
.page-download__cta-button,
.page-download__btn-primary,
.page-download__btn-secondary,
.page-download a[class*="button"],
.page-download a[class*="btn"] {
  max-width: 100%;
  box-sizing: border-box;
  white-space: normal;
  word-wrap: break-word;
}

/* Button containers base responsive style */
.page-download__cta-buttons,
.page-download__button-group,
.page-download__btn-container {
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .page-download__hero-section {
    padding-top: 10px !important; /* body already has padding-top */
    padding-bottom: 40px;
    padding-left: 15px;
    padding-right: 15px;
  }

  .page-download__hero-image img {
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  }

  .page-download__main-title {
    font-size: clamp(1.8rem, 8vw, 2.5rem); /* Adjust clamp for smaller screens */
    margin-bottom: 15px;
  }

  .page-download__hero-description {
    font-size: 1rem;
    margin-bottom: 25px;
  }

  .page-download__cta-button {
    padding: 12px 30px;
    font-size: 1rem;
    margin-top: 20px;
  }

  .page-download__cta-button--large {
    padding: 15px 40px;
    font-size: 1.1rem;
    margin-top: 30px;
  }

  .page-download__section {
    padding: 50px 0;
  }

  .page-download__section-title {
    font-size: clamp(1.5rem, 6vw, 2rem);
    margin-bottom: 30px;
  }

  .page-download__section-description {
    font-size: 0.95rem;
    margin-bottom: 40px;
  }

  .page-download__container {
    padding: 0 15px;
  }

  .page-download__features-grid,
  .page-download__steps-grid,
  .page-download__features-list {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-download__feature-item,
  .page-download__step-item,
  .page-download__feature-card {
    padding: 25px;
    border-radius: 8px;
  }

  .page-download__step-title {
    font-size: 1.2rem;
    padding-left: 50px;
  }

  .page-download__step-number {
    width: 35px;
    height: 35px;
    font-size: 1.2rem;
  }

  .page-download__system-requirements .page-download__requirements-list {
    margin: 30px auto;
  }

  .page-download__system-requirements .page-download__requirements-list li {
    padding: 12px 20px;
    font-size: 0.95rem;
  }

  details.page-download__faq-item {
    border-radius: 8px;
  }

  details.page-download__faq-item summary.page-download__faq-question {
    padding: 15px 20px;
  }

  .page-download__faq-qtext {
    font-size: 1rem;
  }

  details.page-download__faq-item .page-download__faq-answer {
    padding: 0 20px 20px;
  }

  .page-download__final-cta {
    padding-bottom: 80px;
  }

  /* ☠️ 移动端强制适配图片 */
  .page-download img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
  }
  
  .page-download__section,
  .page-download__card,
  .page-download__container,
  .page-download__hero-container,
  .page-download__hero-content,
  .page-download__feature-item,
  .page-download__step-item,
  .page-download__feature-card,
  details.page-download__faq-item { /* Added details.page-download__faq-item as a container */
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
  }
  /* Remove padding from elements that are already children of padded containers */
  .page-download__container {
    padding-left: 0;
    padding-right: 0;
  }
  .page-download__hero-section {
    padding-left: 0;
    padding-right: 0;
  }
  .page-download__section:not(.page-download__hero-section) .page-download__container {
    padding-left: 15px;
    padding-right: 15px;
  }

  /* ☠️ 移动端强制适配按钮 */
  .page-download__cta-button,
  .page-download__btn-primary,
  .page-download__btn-secondary,
  .page-download a[class*="button"],
  .page-download 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; /* Ensure internal padding for button text */
    padding-right: 15px;
  }
  
  .page-download__cta-buttons,
  .page-download__button-group,
  .page-download__btn-container {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
    display: flex;
    flex-direction: column; /* Stack buttons vertically */
    gap: 10px;
  }
}