.page-faq {
  background: var(--tb-bg);
  color: var(--tb-text);
  font-family: var(--tb-font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== Hero 页头 ===== */
.page-faq__hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 300px;
  border-bottom: 2px solid var(--tb-border-strong);
}

.page-faq__hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.page-faq__hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(100deg, rgba(10, 14, 26, 0.96) 0%, rgba(10, 14, 26, 0.78) 50%, rgba(0, 102, 255, 0.42) 100%);
}

.page-faq__hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 3;
  width: 180px;
  height: 10px;
  background: var(--tb-grad-accent);
  clip-path: polygon(0 0, 92% 0, 100% 100%, 8% 100%);
}

.page-faq__hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--tb-container);
  margin: 0 auto;
  padding: 36px 20px 52px;
}

.page-faq__breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--tb-text-dim);
  margin-bottom: 28px;
}

.page-faq__breadcrumb a {
  color: var(--tb-blue);
  text-decoration: none;
  font-weight: 600;
}

.page-faq__breadcrumb a:hover {
  text-decoration: underline;
}

.page-faq__breadcrumb .tb-breadcrumb__sep {
  color: var(--tb-border-strong);
}

.page-faq__breadcrumb .tb-breadcrumb__current {
  color: var(--tb-orange);
}

.page-faq__hero h1 {
  margin: 10px 0 14px;
  font-family: var(--tb-font-head);
  font-weight: 900;
  font-size: clamp(34px, 7vw, 60px);
  line-height: 1.04;
  letter-spacing: 0.01em;
}

.page-faq__hero-lead {
  max-width: 660px;
  margin: 0;
  font-size: 16px;
  color: var(--tb-text-dim);
}

/* ===== 热门问题 ===== */
.page-faq__hot {
  padding: 56px 0 24px;
}

.page-faq__hot-list {
  margin-top: 28px;
}

/* ===== 折叠卡片通用 ===== */
.page-faq__item {
  background: var(--tb-bg-card);
  border: 2px solid var(--tb-border-strong);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.3);
  margin-bottom: 14px;
  transition: border-color 0.25s ease-out, box-shadow 0.25s ease-out;
}

.page-faq__item[open] {
  border-color: var(--tb-blue);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.38);
}

.page-faq__item summary {
  list-style: none;
  cursor: pointer;
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px 18px 56px;
  font-family: var(--tb-font-head);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.02em;
}

.page-faq__item summary::-webkit-details-marker {
  display: none;
}

.page-faq__item summary:hover {
  color: var(--tb-blue);
}

.page-faq__item summary::before {
  content: "+";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--tb-grad-main);
  color: var(--tb-bg);
  font-family: var(--tb-font-data);
  font-weight: 700;
  font-size: 16px;
  line-height: 1;
  clip-path: polygon(14% 0, 100% 0, 88% 100%, 0 100%);
}

.page-faq__item[open] summary::before {
  content: "−";
  background: var(--tb-grad-accent);
}

.page-faq__answer {
  padding: 0 20px 20px 56px;
  color: var(--tb-text-dim);
  font-size: 15px;
}

.page-faq__answer p {
  margin: 0 0 10px;
}

.page-faq__answer p:last-child {
  margin-bottom: 0;
}

.page-faq__answer a {
  color: var(--tb-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq__answer a:hover {
  color: var(--tb-orange);
}

/* ===== 热门问题编号 ===== */
.page-faq__item-index {
  margin-left: auto;
  font-family: var(--tb-font-data);
  font-size: 13px;
  color: var(--tb-text-dim);
  border: 1px solid var(--tb-border-fine);
  padding: 2px 8px;
  flex-shrink: 0;
}

/* ===== 分类索引 ===== */
.page-faq__directory {
  padding: 24px 0 56px;
}

.page-faq__layout {
  margin-top: 32px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-faq__aside-title {
  margin: 0 0 12px;
  font-family: var(--tb-font-head);
  font-weight: 700;
  font-size: 14px;
  color: var(--tb-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.page-faq__categories {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-faq__category {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--tb-bg-card);
  border: 2px solid var(--tb-border-strong);
  border-left-width: 6px;
  color: var(--tb-text);
  font-family: var(--tb-font-head);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  transition: transform 0.2s ease-out, box-shadow 0.2s ease-out, border-color 0.2s ease-out;
}

.page-faq__category:hover,
.page-faq__category:focus-visible {
  transform: translateX(4px);
  box-shadow: var(--tb-shadow-sm);
  border-color: var(--tb-blue);
  outline: none;
}

.page-faq__category--account {
  border-left-color: var(--tb-blue);
}

.page-faq__category--client {
  border-left-color: var(--tb-orange);
}

.page-faq__category--data {
  border-left-color: var(--tb-gold);
}

.page-faq__category--privacy {
  border-left-color: var(--tb-blue-deep);
}

.page-faq__category-count {
  background: var(--tb-bg-panel);
  border: 1px solid var(--tb-border-strong);
  padding: 2px 8px;
  font-family: var(--tb-font-data);
  font-size: 13px;
  color: var(--tb-text-dim);
}

.page-faq__aside-figure {
  margin: 20px 0 0;
  border: 2px solid var(--tb-border-strong);
  box-shadow: var(--tb-shadow-sm);
  background: var(--tb-bg-card);
}

.page-faq__aside-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq__aside-caption {
  padding: 8px 12px;
  font-size: 12px;
  color: var(--tb-text-dim);
  border-top: 1px solid var(--tb-border-fine);
}

/* ===== 分组问题列表 ===== */
.page-faq__group {
  scroll-margin-top: 88px;
}

.page-faq__group-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 32px 0 14px;
  font-family: var(--tb-font-head);
  font-weight: 800;
  font-size: 22px;
}

.page-faq__group:first-child .page-faq__group-title {
  margin-top: 0;
}

.page-faq__group-title::before {
  content: "";
  display: block;
  width: 24px;
  height: 6px;
  background: var(--tb-grad-main);
  clip-path: polygon(0 0, 100% 0, 88% 100%, 0 100%);
}

/* ===== 联系支持 ===== */
.page-faq__support {
  padding: 0 0 72px;
}

.page-faq__support-card {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.22), rgba(10, 14, 26, 0.72)), var(--tb-bg-card);
  border: 2px solid var(--tb-blue);
  box-shadow: var(--tb-shadow);
  padding: 40px 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 24px;
}

.page-faq__support-card::after {
  content: "";
  position: absolute;
  right: -30px;
  top: -30px;
  width: 160px;
  height: 160px;
  background: var(--tb-grad-accent);
  clip-path: polygon(0 0, 100% 0, 85% 100%);
  opacity: 0.28;
  z-index: 0;
}

.page-faq__support-copy {
  position: relative;
  z-index: 1;
  flex: 1 1 320px;
}

.page-faq__support-copy h2 {
  margin: 8px 0 10px;
  font-family: var(--tb-font-head);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 38px);
}

.page-faq__support-copy p {
  max-width: 640px;
  color: var(--tb-text-dim);
  margin: 0 0 20px;
}

.page-faq__support-link {
  margin-top: 4px;
}

.page-faq__support-meta {
  position: relative;
  z-index: 1;
  margin-left: auto;
  text-align: center;
  border: 2px solid var(--tb-border-strong);
  background: rgba(10, 14, 26, 0.72);
  padding: 20px 24px;
  min-width: 160px;
}

.page-faq__support-num {
  display: block;
  font-family: var(--tb-font-data);
  font-size: 52px;
  font-weight: 700;
  color: var(--tb-gold);
  line-height: 1;
}

.page-faq__support-unit {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--tb-text);
}

.page-faq__support-caption {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--tb-text-dim);
}

/* ===== 桌面端布局 ===== */
@media (min-width: 900px) {
  .page-faq__hero {
    min-height: 320px;
  }

  .page-faq__hero-content {
    padding: 44px 20px 60px;
  }

  .page-faq__hot {
    padding: 72px 0 32px;
  }

  .page-faq__hot-list {
    margin-top: 36px;
  }

  .page-faq__item summary {
    font-size: 18px;
    padding: 20px 24px 20px 60px;
  }

  .page-faq__answer {
    padding: 0 24px 24px 60px;
    font-size: 15px;
  }

  .page-faq__directory {
    padding: 32px 0 72px;
  }

  .page-faq__layout {
    grid-template-columns: 300px 1fr;
    align-items: start;
    gap: 40px;
    margin-top: 40px;
  }

  .page-faq__aside {
    position: sticky;
    top: calc(var(--tb-header-h) + 16px);
  }

  .page-faq__support {
    padding: 0 0 96px;
  }
}