.page-faq {
  --faq-grid-line: rgba(255, 255, 255, 0.05);
  --faq-card-bg: rgba(6, 19, 43, 0.65);
  --faq-radius: 14px;

  position: relative;
  background-color: var(--space-blue);
  color: var(--white);
  overflow-x: hidden;
}

/* ===== 首屏 Hero ===== */
.page-faq .faq-hero {
  position: relative;
  padding: 36px 0 0;
  background:
    radial-gradient(circle at 85% 30%, rgba(0, 255, 138, 0.08), transparent 260px),
    linear-gradient(160deg, var(--deep-blue) 0%, var(--space-blue) 68%, var(--space-blue) 100%);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--faq-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--faq-grid-line) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: linear-gradient(115deg, transparent 32%, #000 88%);
  mask-image: linear-gradient(115deg, transparent 32%, #000 88%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: 44px;
  right: 8%;
  width: 120px;
  height: 120px;
  background: var(--orange);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
  opacity: 0.16;
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.page-faq .faq-hero__content {
  position: relative;
  padding-right: 12px;
}

.page-faq .breadcrumb {
  margin-bottom: 18px;
}

.page-faq .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 10px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
  color: var(--mid-gray);
}

.page-faq .breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.page-faq .breadcrumb li + li::before {
  content: "→";
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.page-faq .breadcrumb a {
  color: var(--mid-gray);
  text-decoration: none;
  transition: color var(--transition);
}

.page-faq .breadcrumb a:hover {
  color: var(--lime);
}

.page-faq .breadcrumb [aria-current="page"] {
  color: var(--white);
}

.page-faq .faq-hero .data-tag {
  display: inline-block;
  margin-bottom: 16px;
}

.page-faq .faq-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 1.2rem + 1.8vw, 2.35rem);
  line-height: 1.24;
  letter-spacing: -0.02em;
}

.page-faq .faq-hero__lead {
  max-width: 640px;
  margin: 0 0 22px;
  color: var(--light-gray);
  font-size: 1rem;
  line-height: 1.75;
}

.page-faq .faq-hero__media {
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-bottom: 0;
  border-radius: 18px 18px 0 0;
  overflow: hidden;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.24);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: cover;
}

/* ===== 搜索与快速分类 ===== */
.page-faq .faq-search-panel {
  position: relative;
  z-index: 2;
  padding: 26px 0 2px;
}

.page-faq .faq-search-box {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 640px;
  background: rgba(6, 19, 43, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 14px;
  padding: 4px 18px 4px 14px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.16);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.page-faq .faq-search-box:focus-within {
  border-color: var(--lime);
  box-shadow: 0 0 0 3px var(--lime-dim);
}

.page-faq .faq-search-box__icon {
  display: inline-flex;
  color: var(--lime);
}

.page-faq .faq-search-box__input {
  flex: 1;
  min-width: 0;
  padding: 12px 4px;
  background: transparent;
  border: 0;
  outline: 0;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 0.95rem;
}

.page-faq .faq-search-box__input::placeholder {
  color: var(--mid-gray);
}

.page-faq .faq-search-box__input:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 4px;
  border-radius: 4px;
}

.page-faq .faq-quick-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 16px 0 30px;
}

.page-faq .faq-quick-tags li {
  display: inline-flex;
}

.page-faq .faq-quick-tag {
  display: inline-block;
  border: 1px solid rgba(0, 255, 138, 0.5);
  background: var(--lime-dim);
  color: var(--lime);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 0.875rem;
  text-decoration: none;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.page-faq .faq-quick-tag:hover,
.page-faq .faq-quick-tag:focus-visible {
  background: var(--lime);
  color: var(--deep-blue);
  border-color: var(--lime);
  outline: 0;
}

/* ===== 主体布局 ===== */
.page-faq .faq-layout {
  padding: 8px 0 64px;
  background-image:
    linear-gradient(var(--faq-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--faq-grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
}

.page-faq .faq-layout__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

/* ===== 侧边栏目录 ===== */
.page-faq .faq-sidebar {
  min-width: 0;
}

.page-faq .faq-sidebar__title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  font-family: var(--font-head);
  font-size: 1.05rem;
}

.page-faq .faq-sidebar__title::before {
  content: "";
  width: 18px;
  height: 18px;
  background: var(--lime);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
  flex-shrink: 0;
}

.page-faq .faq-cat-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .faq-cat-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 10px 14px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  background: rgba(6, 19, 43, 0.55);
  color: var(--light-gray);
  font-size: 0.92rem;
  text-decoration: none;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.page-faq .faq-cat-link:hover {
  color: var(--white);
  border-color: var(--lime);
}

.page-faq .faq-cat-link.is-active {
  color: var(--white);
  border-color: rgba(0, 255, 138, 0.7);
  background: var(--lime-dim);
}

.page-faq .faq-cat-link__count {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--orange);
}

.page-faq .faq-sidebar__media {
  margin: 22px 0 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--faq-radius);
  overflow: hidden;
  background: var(--deep-blue);
}

.page-faq .faq-sidebar__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}

.page-faq .faq-sidebar__media figcaption {
  padding: 12px 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--mid-gray);
  font-size: 0.85rem;
  line-height: 1.6;
}

.page-faq .faq-sidebar__badge {
  display: inline-block;
  margin-bottom: 6px;
  background: var(--orange);
  color: #fff;
  border-radius: 999px;
  padding: 2px 9px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
}

/* ===== 问题分组 ===== */
.page-faq .faq-main {
  min-width: 0;
}

.page-faq .faq-group {
  margin-bottom: 52px;
  scroll-margin-top: 96px;
}

.page-faq .chapter-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.page-faq .chapter-id {
  flex-shrink: 0;
  min-width: 48px;
  padding: 4px 8px;
  border-radius: 8px;
  background: var(--lime-dim);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  text-align: center;
}

.page-faq .chapter-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.3rem;
  line-height: 1.35;
}

.page-faq .faq-group__desc {
  margin: 0 0 20px 60px;
  color: var(--mid-gray);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ===== 手风琴 ===== */
.page-faq .faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-faq .faq-item {
  background: var(--faq-card-bg);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--faq-radius);
  display: grid;
  grid-template-rows: auto 0fr;
  transition: border-color var(--transition), box-shadow var(--transition), grid-template-rows 300ms ease;
  overflow: hidden;
}

.page-faq .faq-item:hover {
  border-color: rgba(0, 255, 138, 0.45);
}

.page-faq .faq-item[open] {
  border-color: rgba(0, 255, 138, 0.6);
  box-shadow: 0 0 0 1px var(--lime-dim), 0 16px 32px rgba(0, 0, 0, 0.22);
  grid-template-rows: auto 1fr;
}

.page-faq .faq-item__summary {
  list-style: none;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 18px 18px 20px;
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
}

.page-faq .faq-item__summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item__summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
  border-radius: var(--faq-radius);
}

.page-faq .faq-item__num {
  min-width: 34px;
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.page-faq .faq-item__title {
  flex: 1;
  color: var(--white);
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.6;
}

.page-faq .faq-item__mark {
  position: relative;
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  border: 1.5px solid var(--mid-gray);
  border-radius: 50%;
  transition: border-color var(--transition), background var(--transition);
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  border-radius: 2px;
  background: var(--mid-gray);
  transition: background var(--transition), opacity var(--transition), transform var(--transition);
}

.page-faq .faq-item__mark::before {
  width: 9px;
  height: 2px;
}

.page-faq .faq-item__mark::after {
  width: 2px;
  height: 9px;
}

.page-faq .faq-item[open] .faq-item__mark {
  border-color: var(--lime);
  background: var(--lime-dim);
}

.page-faq .faq-item[open] .faq-item__mark::before,
.page-faq .faq-item[open] .faq-item__mark::after {
  background: var(--lime);
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.page-faq .faq-item__body {
  min-height: 0;
  overflow: hidden;
}

.page-faq .faq-item__inner {
  padding: 14px 22px 22px 68px;
  color: var(--light-gray);
  font-size: 0.94rem;
  line-height: 1.75;
}

.page-faq .faq-item__inner a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(0, 255, 138, 0.4);
  transition: color var(--transition), text-decoration-color var(--transition);
}

.page-faq .faq-item__inner a:hover {
  color: var(--orange);
  text-decoration-color: var(--orange);
}

/* ===== 底部联系 ===== */
.page-faq .faq-cta {
  padding: 4px 0 0;
}

.page-faq .faq-cta__card {
  position: relative;
  overflow: hidden;
  display: grid;
  justify-items: start;
  gap: 12px;
  padding: 32px 28px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 20px;
  background: linear-gradient(135deg, var(--deep-blue) 0%, var(--space-blue) 100%);
}

.page-faq .faq-cta__card::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -40px;
  width: 160px;
  height: 160px;
  background: var(--lime);
  opacity: 0.08;
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}

.page-faq .faq-cta__card::after {
  content: "SUPPORT";
  position: absolute;
  right: 18px;
  bottom: 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--lime);
  writing-mode: vertical-rl;
  opacity: 0.7;
}

.page-faq .faq-cta__card h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.35rem;
}

.page-faq .faq-cta__card p {
  margin: 0 0 8px;
  max-width: 620px;
  color: var(--light-gray);
  font-size: 0.95rem;
  line-height: 1.75;
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

/* ===== 桌面端 ===== */
@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding-top: 56px;
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: end;
    gap: 34px;
  }

  .page-faq .faq-hero__content {
    padding-bottom: 30px;
  }

  .page-faq .faq-hero__media img {
    height: 360px;
  }

  .page-faq .faq-layout {
    padding-bottom: 84px;
  }

  .page-faq .faq-layout__grid {
    grid-template-columns: 280px 1fr;
    gap: 48px;
  }

  .page-faq .faq-sidebar {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-faq .faq-cat-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .page-faq .faq-cat-link {
    width: 100%;
  }

  .page-faq .faq-group__desc {
    margin-left: 74px;
  }

  .page-faq .faq-item__inner {
    padding-left: 74px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item[open] {
    transition: none;
  }

  .page-faq .faq-search-box,
  .page-faq .faq-quick-tag,
  .page-faq .faq-cat-link {
    transition: none;
  }
}