.page-faq {
  --faq-bg-card: #141414;
  --faq-border-subtle: #2a2a2a;
  --faq-border-active: #b22222;
  --faq-gold-dim: rgba(255, 215, 0, 0.12);
  --faq-red-dim: rgba(178, 34, 34, 0.18);
  --faq-radius-capsule: 60px;
  --faq-radius-item: 16px;
  --faq-sidebar-width: 200px;
  --faq-gap: 28px;

  padding: 0 16px 48px;
  max-width: var(--max-width);
  margin: 0 auto;
  color: var(--color-text);
}

/* ── 面包屑 ── */
.page-faq .breadcrumb {
  padding: 24px 0 12px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.3px;
}
.page-faq .breadcrumb a {
  color: var(--color-gold);
  text-decoration: none;
  transition: color var(--transition-speed);
}
.page-faq .breadcrumb a:hover {
  color: var(--color-hover-red);
}
.page-faq .breadcrumb .separator {
  margin: 0 8px;
  color: var(--color-border);
}
.page-faq .breadcrumb [aria-current="page"] {
  color: var(--color-text);
}

/* ── 页面头部 ── */
.page-faq .page-header {
  padding: 16px 0 36px;
  border-bottom: 2px solid var(--faq-border-subtle);
  margin-bottom: 32px;
}
.page-faq .page-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-style: italic;
  font-size: clamp(2.4rem, 7vw, 4.2rem);
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: -1px;
  background: var(--gradient-red-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 0 0 12px;
}
.page-faq .page-desc {
  font-family: var(--font-body);
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 640px;
  line-height: 1.5;
  margin: 0;
}

/* ── 布局容器 ── */
.page-faq .faq-layout {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
}

/* ── radio 隐藏 ── */
.page-faq .category-radio {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

/* ── 侧边栏 / 分类标签 ── */
.page-faq .faq-sidebar {
  flex-shrink: 0;
}
.page-faq .category-tabs {
  display: flex;
  flex-wrap: nowrap;
  gap: 12px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 4px 0 8px;
}
.page-faq .category-tabs::-webkit-scrollbar {
  display: none;
}
.page-faq .category-capsule {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 22px 10px 16px;
  background: var(--faq-bg-card);
  border: 1.5px solid var(--faq-border-subtle);
  border-radius: var(--faq-radius-capsule);
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  white-space: nowrap;
  font-family: var(--font-cta);
  font-weight: 700;
  font-size: 0.92rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--color-text-secondary);
  user-select: none;
}
.page-faq .category-capsule:hover {
  border-color: var(--color-red);
  background: var(--faq-red-dim);
  color: var(--color-text);
}
.page-faq .capsule-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--faq-bg-card);
}
.page-faq .capsule-label {
  line-height: 1;
}

/* 选中态：通过 radio:checked 控制 capsule 高亮 */
.page-faq #cat-subscribe:checked ~ .faq-sidebar .category-tabs label[for="cat-subscribe"],
.page-faq #cat-version:checked   ~ .faq-sidebar .category-tabs label[for="cat-version"],
.page-faq #cat-data:checked      ~ .faq-sidebar .category-tabs label[for="cat-data"],
.page-faq #cat-account:checked   ~ .faq-sidebar .category-tabs label[for="cat-account"] {
  background: var(--gradient-red-gold);
  border-color: transparent;
  color: #000;
  box-shadow: 0 4px 18px rgba(178, 34, 34, 0.35);
}
.page-faq #cat-subscribe:checked ~ .faq-sidebar .category-tabs label[for="cat-subscribe"] .capsule-icon,
.page-faq #cat-version:checked   ~ .faq-sidebar .category-tabs label[for="cat-version"] .capsule-icon,
.page-faq #cat-data:checked      ~ .faq-sidebar .category-tabs label[for="cat-data"] .capsule-icon,
.page-faq #cat-account:checked   ~ .faq-sidebar .category-tabs label[for="cat-account"] .capsule-icon {
  background: transparent;
}

/* ── 问答组容器 ── */
.page-faq .faq-groups {
  flex: 1;
  min-width: 0;
}
.page-faq .faq-group {
  display: none;
  animation: faqFadeIn 0.35s ease;
}
@keyframes faqFadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* radio 控制显示哪个组 */
.page-faq #cat-subscribe:checked ~ .faq-groups .faq-group[data-category="subscribe"],
.page-faq #cat-version:checked   ~ .faq-groups .faq-group[data-category="version"],
.page-faq #cat-data:checked      ~ .faq-groups .faq-group[data-category="data"],
.page-faq #cat-account:checked   ~ .faq-groups .faq-group[data-category="account"] {
  display: block;
}

.page-faq .group-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-style: italic;
  font-size: 1.6rem;
  text-transform: uppercase;
  letter-spacing: -0.5px;
  color: var(--color-text);
  margin: 0 0 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--faq-border-active);
  display: inline-block;
}

/* ── 折叠问答项 ── */
.page-faq .faq-item {
  background: var(--faq-bg-card);
  border: 1px solid var(--faq-border-subtle);
  border-radius: var(--faq-radius-item);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition-speed);
}
.page-faq .faq-item[open] {
  border-color: var(--faq-border-active);
  box-shadow: 0 0 0 1px var(--faq-border-active);
}

.page-faq .faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 22px;
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-text);
  line-height: 1.4;
  list-style: none;
  transition: background var(--transition-speed);
  user-select: none;
}
.page-faq .faq-question::-webkit-details-marker {
  display: none;
}
.page-faq .faq-question::marker {
  display: none;
  content: "";
}
.page-faq .faq-question:hover {
  background: var(--faq-red-dim);
}
.page-faq .faq-item[open] .faq-question {
  background: var(--faq-red-dim);
}

.page-faq .question-text {
  flex: 1;
}

/* 自定义箭头 */
.page-faq .faq-arrow {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  position: relative;
  transition: transform var(--transition-speed) ease;
}
.page-faq .faq-arrow::before,
.page-faq .faq-arrow::after {
  content: "";
  position: absolute;
  background: var(--color-gold);
  border-radius: 2px;
  top: 50%;
  left: 50%;
  transition: transform var(--transition-speed) ease;
}
.page-faq .faq-arrow::before {
  width: 2.5px;
  height: 14px;
  transform: translate(-50%, -50%);
}
.page-faq .faq-arrow::after {
  width: 14px;
  height: 2.5px;
  transform: translate(-50%, -50%);
}
.page-faq .faq-item[open] .faq-arrow {
  transform: rotate(45deg);
}

/* 答案内容 */
.page-faq .faq-answer {
  padding: 0 22px 20px;
  font-family: var(--font-body);
  font-size: 0.98rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}
.page-faq .faq-answer p {
  margin: 12px 0 0;
}
.page-faq .faq-answer a {
  color: var(--color-gold);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-speed);
}
.page-faq .faq-answer a:hover {
  color: var(--color-hover-red);
}
.page-faq .answer-img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  margin-top: 16px;
  border: 1px solid var(--faq-border-subtle);
  display: block;
}

/* ── 联系客服区 ── */
.page-faq .contact-section {
  margin-top: 52px;
  padding: 36px 0 16px;
  border-top: 2px solid var(--faq-border-subtle);
}
.page-faq .contact-inner {
  background: var(--faq-bg-card);
  border: 1px solid var(--faq-border-subtle);
  border-radius: var(--faq-radius-item);
  padding: 32px 28px;
}
.page-faq .contact-section .section-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-style: italic;
  font-size: 1.8rem;
  text-transform: uppercase;
  letter-spacing: -0.5px;
  background: var(--gradient-red-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 0 0 10px;
  display: inline-block;
}
.page-faq .contact-desc {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin: 0 0 20px;
}
.page-faq .contact-details {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}
.page-faq .contact-item {
  display: flex;
  gap: 12px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}
.page-faq .contact-label {
  font-weight: 700;
  color: var(--color-gold);
  min-width: 44px;
  flex-shrink: 0;
}
.page-faq .contact-value {
  color: var(--color-text);
}
.page-faq .contact-note {
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  font-style: italic;
  margin: 0 0 20px;
  padding: 10px 14px;
  background: var(--faq-gold-dim);
  border-left: 3px solid var(--color-gold);
  border-radius: 0 8px 8px 0;
}
.page-faq .btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 30px;
  font-family: var(--font-cta);
  font-weight: 700;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: #000;
  background: var(--gradient-red-gold);
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-speed);
}
.page-faq .btn:hover {
  transform: scale(1.03);
  box-shadow: 0 6px 24px rgba(178, 34, 34, 0.4);
}

/* ── 信任声明 ── */
.page-faq .trust-statement {
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--color-gold);
  text-align: center;
  padding: 28px 0 8px;
  margin: 0;
  letter-spacing: 0.4px;
  opacity: 0.75;
}

/* =============================================
   桌面端 ≥ 768px
   ============================================= */
@media (min-width: 768px) {
  .page-faq {
    padding: 0 32px 64px;
  }
  .page-faq .breadcrumb {
    padding-top: 28px;
  }
  .page-faq .page-header {
    padding-bottom: 40px;
    margin-bottom: 40px;
  }

  .page-faq .faq-layout {
    flex-direction: row;
    gap: 36px;
    align-items: flex-start;
  }

  .page-faq .faq-sidebar {
    position: sticky;
    top: 90px;
    width: var(--faq-sidebar-width);
    flex-shrink: 0;
  }
  .page-faq .category-tabs {
    flex-direction: column;
    gap: 8px;
    overflow-x: visible;
    padding: 0;
  }
  .page-faq .category-capsule {
    width: 100%;
    padding: 12px 20px 12px 16px;
    font-size: 0.88rem;
  }

  .page-faq .faq-groups {
    flex: 1;
    min-width: 0;
  }

  .page-faq .faq-question {
    padding: 20px 26px;
    font-size: 1.08rem;
  }
  .page-faq .faq-answer {
    padding: 0 26px 22px;
    font-size: 1rem;
  }

  .page-faq .contact-section {
    padding-top: 48px;
  }
  .page-faq .contact-inner {
    padding: 40px 36px;
  }
  .page-faq .contact-details {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 20px 36px;
  }
  .page-faq .contact-item {
    font-size: 1rem;
  }
}

/* =============================================
   大桌面端 ≥ 1024px
   ============================================= */
@media (min-width: 1024px) {
  .page-faq {
    padding: 0 40px 72px;
  }
  .page-faq .faq-sidebar {
    width: 220px;
  }
  .page-faq .category-capsule {
    padding: 14px 24px 14px 18px;
    font-size: 0.92rem;
  }
  .page-faq .faq-groups {
    max-width: 820px;
  }
  .page-faq .group-title {
    font-size: 1.8rem;
  }
}