/* ============================================================
   page-faq – 支持中心 · 常见问题解答
   所有选择器限定在 .page-faq 作用域内
   ============================================================ */
.page-faq {
  --faq-content-max: 820px;
  --faq-edge-width: 5px;
  --faq-gold-border: 2px solid var(--color-gold, #FFD700);
  --faq-card-radius: 4px;
  --faq-transition: 0.35s cubic-bezier(0.25, 0.1, 0.25, 1);

  position: relative;
  display: block;
  width: 100%;
  max-width: var(--content-width, 960px);
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
  font-family: var(--font-body, 'Noto Sans SC', system-ui, sans-serif);
  color: var(--color-text, #FFFFFF);
  background-color: transparent;
  line-height: 1.6;
  overflow: hidden;
}

/* ---- 背景纹理装饰 ---- */
.page-faq .page-bg-decor {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  opacity: 0.06;
}
.page-faq .page-bg-decor .bg-texture {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* ---- 面包屑 ---- */
.page-faq .breadcrumb {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
  font-size: 0.8rem;
  color: var(--color-text-soft, #A0A0A0);
}
.page-faq .breadcrumb a {
  color: var(--color-accent, #FF4500);
  text-decoration: none;
  transition: color 0.2s;
}
.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--color-gold, #FFD700);
  text-decoration: underline;
}
.page-faq .breadcrumb .breadcrumb-sep {
  color: var(--color-text-soft, #A0A0A0);
  font-size: 0.7rem;
}

/* ---- 页面标题区 ---- */
.page-faq .page-header {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
  margin-bottom: 2.5rem;
}
.page-faq .page-header__number {
  flex-shrink: 0;
  font-family: var(--font-heading, 'Orbitron', sans-serif);
  font-size: 4rem;
  font-weight: 900;
  line-height: 1;
  color: var(--color-accent, #FF4500);
  opacity: 0.5;
  margin-top: -0.15em;
}
.page-faq .page-header__text {
  flex: 1;
  min-width: 0;
}
.page-faq .page-title {
  font-family: var(--font-heading, 'Orbitron', sans-serif);
  font-size: 2.2rem;
  font-weight: 900;
  margin: 0 0 0.4rem;
  color: var(--color-text, #FFFFFF);
  letter-spacing: 0.02em;
}
.page-faq .page-desc {
  margin: 0;
  font-size: 1rem;
  color: var(--color-text-soft, #A0A0A0);
  max-width: 36em;
}

/* ---- 筛选栏 ---- */
.page-faq .filter-bar {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: nowrap;
  gap: 0.6rem;
  margin-bottom: 2.8rem;
  padding-bottom: 0.4rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--color-accent, #FF4500) transparent;
}
.page-faq .filter-bar::-webkit-scrollbar {
  height: 4px;
}
.page-faq .filter-bar::-webkit-scrollbar-thumb {
  background: var(--color-accent, #FF4500);
  border-radius: 2px;
}
.page-faq .filter-btn {
  flex-shrink: 0;
  font-family: var(--font-heading, 'Orbitron', sans-serif);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.5rem 1.1rem;
  border: 2px solid var(--color-accent, #FF4500);
  border-radius: 2px;
  background: transparent;
  color: var(--color-accent, #FF4500);
  cursor: pointer;
  transition: all var(--faq-transition);
  white-space: nowrap;
}
.page-faq .filter-btn:hover,
.page-faq .filter-btn:focus-visible {
  background: var(--color-accent, #FF4500);
  color: var(--color-text, #FFFFFF);
  outline: none;
}
.page-faq .filter-btn.is-active {
  background: var(--color-accent, #FF4500);
  color: var(--color-text, #FFFFFF);
  border-color: var(--color-accent, #FF4500);
  box-shadow: 0 0 0 2px var(--color-gold, #FFD700) inset;
}

/* ---- FAQ 内容容器 ---- */
.page-faq .faq-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

/* ---- 主题区块 ---- */
.page-faq .topic-section {
  position: relative;
  display: flex;
  gap: 0;
  scroll-margin-top: 5rem;
}
.page-faq .topic-edge {
  flex-shrink: 0;
  width: var(--faq-edge-width, 5px);
  border-radius: 3px;
  margin-right: 1.2rem;
  align-self: stretch;
  min-height: 120px;
}
.page-faq .topic-inner {
  flex: 1;
  min-width: 0;
}
.page-faq .topic-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.page-faq .topic-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 2px;
  background: var(--color-nav, #2A2A2A);
  padding: 4px;
  display: block;
}
.page-faq .topic-title {
  font-family: var(--font-heading, 'Orbitron', sans-serif);
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-text, #FFFFFF);
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.page-faq .topic-num {
  font-weight: 900;
  color: var(--color-accent, #FF4500);
  font-size: 1.1em;
  letter-spacing: 0.02em;
}
.page-faq .topic-label {
  color: var(--color-text, #FFFFFF);
}
.page-faq .topic-tag {
  font-family: var(--font-heading, 'Orbitron', sans-serif);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--color-gold, #FFD700);
  color: var(--color-gold, #FFD700);
  background: rgba(255, 215, 0, 0.08);
  border-radius: 2px;
  margin-left: auto;
  white-space: nowrap;
}

/* ---- 问答列表 ---- */
.page-faq .faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

/* ---- 单个问答项 ---- */
.page-faq .faq-item {
  border-radius: var(--faq-card-radius, 4px);
  overflow: hidden;
  background: transparent;
  border: 1px solid rgba(255, 215, 0, 0.25);
  transition: border-color var(--faq-transition);
}
.page-faq .faq-item:hover {
  border-color: rgba(255, 215, 0, 0.55);
}

/* ---- 问题按钮 ---- */
.page-faq .faq-question {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.9rem 1rem;
  background: rgba(42, 42, 42, 0.6);
  border: none;
  border-bottom: 1px solid rgba(255, 215, 0, 0.2);
  color: var(--color-text, #FFFFFF);
  font-family: var(--font-body, 'Noto Sans SC', system-ui, sans-serif);
  font-size: 0.95rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: background var(--faq-transition);
  line-height: 1.4;
}
.page-faq .faq-question:hover,
.page-faq .faq-question:focus-visible {
  background: rgba(255, 69, 0, 0.12);
  outline: none;
}
.page-faq .faq-q-num {
  flex-shrink: 0;
  font-family: var(--font-heading, 'Orbitron', sans-serif);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent, #FF4500);
  background: rgba(255, 69, 0, 0.12);
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
  letter-spacing: 0.04em;
}
.page-faq .faq-question-text {
  flex: 1;
  min-width: 0;
}
.page-faq .faq-toggle-icon {
  flex-shrink: 0;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-accent, #FF4500);
  width: 1.2rem;
  text-align: center;
  transition: transform var(--faq-transition);
}

/* ---- 回答区域 ---- */
.page-faq .faq-answer {
  padding: 0 1rem 1rem;
  background: var(--color-card, #F5E6CC);
  color: #1A1A1A;
  font-size: 0.92rem;
  line-height: 1.65;
  transition: padding var(--faq-transition);
  overflow: hidden;
}
.page-faq .faq-answer[data-expanded="false"] {
  display: none;
  padding-top: 0;
  padding-bottom: 0;
}
.page-faq .faq-answer[data-expanded="true"] {
  display: block;
}
.page-faq .faq-answer p {
  margin: 0.8rem 0;
}
.page-faq .faq-answer a {
  color: var(--color-accent, #FF4500);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.2s;
}
.page-faq .faq-answer a:hover,
.page-faq .faq-answer a:focus-visible {
  color: #CC3700;
  text-decoration: none;
}
.page-faq .faq-answer p:first-child {
  margin-top: 0.6rem;
}
.page-faq .faq-answer p:last-child {
  margin-bottom: 0.6rem;
}

/* ---- 联系引导 ---- */
.page-faq .contact-prompt {
  position: relative;
  z-index: 1;
  margin-top: 4rem;
  padding: 2rem 1.5rem;
  background: var(--color-nav, #2A2A2A);
  border-left: 5px solid var(--color-accent, #FF4500);
  border-radius: 4px;
  text-align: center;
}
.page-faq .contact-prompt__inner {
  max-width: 480px;
  margin: 0 auto;
}
.page-faq .contact-prompt__title {
  font-family: var(--font-heading, 'Orbitron', sans-serif);
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0 0 0.6rem;
  color: var(--color-text, #FFFFFF);
}
.page-faq .contact-prompt__text {
  margin: 0 0 1.2rem;
  color: var(--color-text-soft, #A0A0A0);
  font-size: 0.92rem;
  line-height: 1.5;
}
.page-faq .contact-prompt__btn {
  display: inline-block;
  font-family: var(--font-heading, 'Orbitron', sans-serif);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.65rem 1.8rem;
  background: var(--color-accent, #FF4500);
  color: var(--color-text, #FFFFFF);
  border: 2px solid var(--color-accent, #FF4500);
  border-radius: 2px;
  text-decoration: none;
  transition: background var(--faq-transition), transform 0.2s;
  cursor: pointer;
}
.page-faq .contact-prompt__btn:hover,
.page-faq .contact-prompt__btn:focus-visible {
  background: #CC3700;
  border-color: #CC3700;
  transform: translateY(-2px);
  outline: none;
}

/* ============================================================
   桌面端（≥768px）
   ============================================================ */
@media (min-width: 768px) {
  .page-faq {
    padding: 3rem 2rem 5rem;
  }
  .page-faq .breadcrumb {
    font-size: 0.85rem;
    margin-bottom: 2rem;
  }
  .page-faq .page-header {
    gap: 1.5rem;
    margin-bottom: 3rem;
  }
  .page-faq .page-header__number {
    font-size: 5.5rem;
  }
  .page-faq .page-title {
    font-size: 2.8rem;
  }
  .page-faq .page-desc {
    font-size: 1.05rem;
  }
  .page-faq .filter-bar {
    gap: 0.8rem;
    margin-bottom: 3.5rem;
    justify-content: center;
    overflow-x: visible;
  }
  .page-faq .filter-btn {
    font-size: 0.8rem;
    padding: 0.55rem 1.4rem;
  }
  .page-faq .faq-content {
    gap: 3.5rem;
  }
  .page-faq .topic-edge {
    width: 6px;
    margin-right: 1.5rem;
  }
  .page-faq .topic-icon {
    width: 48px;
    height: 48px;
  }
  .page-faq .topic-title {
    font-size: 1.6rem;
  }
  .page-faq .topic-tag {
    font-size: 0.65rem;
    margin-left: auto;
  }
  .page-faq .faq-question {
    font-size: 1rem;
    padding: 1rem 1.2rem;
  }
  .page-faq .faq-answer {
    font-size: 0.95rem;
    padding: 0 1.2rem 1.2rem;
  }
  .page-faq .faq-answer p:first-child {
    margin-top: 0.8rem;
  }
  .page-faq .faq-answer p:last-child {
    margin-bottom: 0.8rem;
  }
  .page-faq .contact-prompt {
    padding: 2.5rem 2rem;
    margin-top: 5rem;
  }
  .page-faq .contact-prompt__title {
    font-size: 1.5rem;
  }
  .page-faq .contact-prompt__text {
    font-size: 0.95rem;
  }
  .page-faq .contact-prompt__btn {
    font-size: 0.9rem;
    padding: 0.7rem 2rem;
  }
}

/* ============================================================
   桌面宽屏（≥1024px）– 强化内容宽度与间距
   ============================================================ */
@media (min-width: 1024px) {
  .page-faq {
    padding: 4rem 2rem 6rem;
  }
  .page-faq .page-header__number {
    font-size: 7rem;
  }
  .page-faq .page-title {
    font-size: 3.2rem;
  }
  .page-faq .faq-content {
    gap: 4rem;
  }
  .page-faq .topic-section {
    max-width: var(--faq-content-max, 820px);
  }
  .page-faq .contact-prompt__inner {
    max-width: 520px;
  }
}