.page-faq {
  --faq-rail: 236px;
  --faq-gap: clamp(24px, 3.4vw, 48px);
  display: block;
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ── 页头 ───────────────────────────────────────── */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(28px, 4.6vw, 56px) 0 clamp(24px, 3.4vw, 40px);
  border-bottom: 1px solid var(--ink-500);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -34%;
  right: -12%;
  width: clamp(260px, 46vw, 680px);
  height: clamp(260px, 46vw, 680px);
  background: radial-gradient(circle at 58% 42%, rgba(51, 225, 242, 0.2), rgba(51, 225, 242, 0) 64%);
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-hero > * {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-faq .faq-hero h1 {
  margin: 0 0 20px;
  max-width: 20ch;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: var(--fs-h1);
  line-height: 0.98;
  letter-spacing: -0.01em;
  color: var(--warm-50);
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 38em;
  color: var(--gray-400);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-faq .faq-hero__media {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  border: 2px solid var(--ink-500);
  box-shadow: var(--shadow-hard);
  background: var(--ink-700);
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

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

@media (min-width: 768px) {
  .page-faq .faq-hero__media {
    aspect-ratio: 8 / 3;
  }
}

/* ── 双栏骨架 ───────────────────────────────────── */
.page-faq .faq-body {
  display: grid;
  gap: clamp(28px, 3.4vw, 40px);
  padding-top: clamp(28px, 4vw, 52px);
}

@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    column-gap: var(--faq-gap);
    align-items: start;
  }
}

/* ── 分类索引 ───────────────────────────────────── */
.page-faq .faq-index {
  border: 2px solid var(--ink-500);
  border-radius: var(--radius);
  background: var(--ink-850);
  padding: 14px 14px 10px;
}

.page-faq .faq-index__title {
  margin: 0 0 10px;
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray-400);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-index__list > li {
  flex: 0 0 auto;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-left: 2px solid transparent;
  border-radius: var(--radius);
  color: var(--gray-400);
  text-decoration: none;
  font-size: var(--fs-small);
  white-space: nowrap;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.page-faq .faq-index__num {
  font-size: var(--fs-label);
  letter-spacing: 0.08em;
  color: var(--cyan-400);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--warm-50);
  border-left-color: var(--cyan-400);
  background: var(--ink-700);
}

.page-faq .faq-index__foot {
  margin: 12px 0 4px;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--gray-400);
}

.page-faq .faq-index__foot a {
  color: var(--orange-500);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 122, 26, 0.45);
}

.page-faq .faq-index__foot a:hover {
  color: var(--orange-200);
}

@media (min-width: 1024px) {
  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
    padding: 4px 0 0;
    border: 0;
    background: transparent;
  }

  .page-faq .faq-index__title {
    padding-left: 14px;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-faq .faq-index__list > li {
    flex: 0 0 auto;
    width: 100%;
  }

  .page-faq .faq-index__link {
    padding: 10px 14px;
  }

  .page-faq .faq-index__foot {
    padding-left: 14px;
  }
}

/* ── 筛选组 ─────────────────────────────────────── */
.page-faq .faq-stream {
  min-width: 0;
}

.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(22px, 3vw, 34px);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--ink-500);
}

.page-faq .filter-btn {
  font-family: var(--font-body);
  font-size: var(--fs-label);
  letter-spacing: 0.14em;
  color: var(--gray-400);
  background: var(--ink-850);
  border: 2px solid var(--ink-500);
  border-radius: var(--radius);
  padding: 8px 13px;
  cursor: pointer;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.page-faq .filter-btn:hover {
  color: var(--warm-50);
  border-color: var(--cyan-400);
}

.page-faq .filter-btn[aria-pressed="true"],
.page-faq .filter-btn.is-active {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  color: var(--ink-950);
  font-weight: 700;
}

/* ── 分类区块 ───────────────────────────────────── */
.page-faq .faq-group {
  margin-bottom: clamp(36px, 5.6vw, 68px);
  scroll-margin-top: calc(var(--bar-h) + 24px);
}

.page-faq .faq-group:last-of-type {
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--cyan-400);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-h2);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--warm-50);
}

.page-faq .faq-group__count {
  flex: 0 0 auto;
  font-size: var(--fs-label);
  letter-spacing: 0.14em;
  color: var(--gray-400);
}

.page-faq .faq-group__lead {
  max-width: 40em;
  margin: 14px 0 20px;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--gray-400);
}

.page-faq .faq-figure {
  margin: 0 0 22px;
  border: 2px solid var(--ink-500);
  box-shadow: var(--shadow-hard-sm);
  background: var(--ink-700);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

@media (min-width: 900px) {
  .page-faq .faq-figure {
    max-width: 560px;
  }
}

.page-faq .media-frame__caption {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.1em;
  color: var(--gray-400);
}

/* ── 折叠问答 ───────────────────────────────────── */
.page-faq .faq-item {
  border: 2px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-item + .faq-item {
  border-top-color: var(--ink-500);
}

.page-faq .faq-item[open] {
  margin-bottom: 8px;
  border-color: var(--ink-500);
  background: var(--ink-700);
  box-shadow: var(--shadow-hard-sm);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  list-style: none;
  cursor: pointer;
  color: var(--warm-50);
  font-size: var(--fs-body);
  font-weight: 500;
  line-height: 1.55;
  transition: color 0.18s ease;
}

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

.page-faq .faq-item__q:hover {
  color: var(--cyan-200);
}

.page-faq .faq-item__idx {
  flex: 0 0 auto;
  padding-top: 3px;
  font-size: var(--fs-label);
  letter-spacing: 0.08em;
  color: var(--cyan-400);
}

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

.page-faq .faq-item__icon {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin-top: 4px;
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--cyan-400);
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.page-faq .faq-item__icon::before {
  top: 8px;
  left: 0;
  width: 18px;
  height: 2px;
}

.page-faq .faq-item__icon::after {
  top: 0;
  left: 8px;
  width: 2px;
  height: 18px;
}

.page-faq .faq-item[open] .faq-item__icon::after {
  transform: scaleY(0);
}

.page-faq .faq-item[open] .faq-item__icon::before {
  background: var(--orange-500);
}

.page-faq .faq-item__a {
  padding: 0 18px 20px 52px;
}

.page-faq .faq-item__a p {
  max-width: 42em;
  margin: 0 0 10px;
  color: var(--warm-50);
  font-size: var(--fs-body);
  line-height: 1.75;
  opacity: 0.9;
}

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

.page-faq .faq-item__a a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(51, 225, 242, 0.5);
}

.page-faq .faq-item__a a:hover {
  color: var(--cyan-200);
}

.page-faq .faq-item__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px !important;
  opacity: 1 !important;
}

.page-faq .faq-item__tag {
  display: inline-block;
  padding: 3px 9px;
  border: 1px solid var(--ink-500);
  border-radius: var(--radius);
  background: var(--ink-850);
  font-size: var(--fs-label);
  letter-spacing: 0.12em;
  color: var(--cyan-200);
}

/* ── 底部引导 ───────────────────────────────────── */
.page-faq .faq-help {
  margin-top: clamp(20px, 3vw, 36px);
  border: 2px solid var(--ink-500);
  border-left: 6px solid var(--orange-500);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(51, 225, 242, 0.1) 0%, rgba(51, 225, 242, 0) 52%),
    var(--ink-850);
  box-shadow: var(--shadow-hard);
  padding: clamp(22px, 3vw, 36px);
}

.page-faq .faq-help__title {
  margin: 12px 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-h2);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--warm-50);
}

.page-faq .faq-help__text {
  max-width: 40em;
  margin: 0 0 22px;
  color: var(--gray-400);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (max-width: 599px) {
  .page-faq .faq-item__a {
    padding: 0 14px 18px 14px;
  }

  .page-faq .faq-help__actions .btn {
    width: 100%;
    text-align: center;
  }
}