.page-faq {
  --faq-rail: 224px;
  --faq-muted: #4B5568;
  --faq-s4: #5A6478;
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  padding-top: 20px;
  padding-bottom: 16px;
}
.page-faq .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--metal-500);
}
.page-faq .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 6px;
  color: var(--line);
}
.page-faq .breadcrumb__link {
  color: var(--teal-700);
  text-decoration: none;
}
.page-faq .breadcrumb__link:hover {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--indigo-900);
  color: var(--text-dark-1);
  padding: 44px 0 0;
}
.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(211, 218, 232, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(211, 218, 232, .07) 1px, transparent 1px);
  background-size: 24px 24px;
}
.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}
.page-faq .faq-hero__kicker {
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--teal-500);
}
.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.02;
  letter-spacing: -.01em;
  color: var(--white);
}
.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dark-2);
}
.page-faq .faq-hero__media {
  margin: 0;
  border: 1px solid rgba(211, 218, 232, .2);
  background: var(--indigo-800);
}
.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 3;
  object-fit: cover;
}
.page-faq .faq-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin: 40px 0 0;
  padding: 0;
  background: rgba(211, 218, 232, .16);
  border-top: 1px solid rgba(211, 218, 232, .16);
}
.page-faq .faq-fact {
  background: var(--indigo-900);
  padding: 18px 16px 24px 0;
}
.page-faq .faq-fact__label {
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--metal-500);
}
.page-faq .faq-fact__num {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1;
  color: var(--teal-500);
}
.page-faq .faq-fact__num span {
  margin-left: 5px;
  font-size: 12px;
  color: var(--metal-500);
}

/* ---------- 章节通用 ---------- */
.page-faq .faq-section {
  padding: 60px 0;
}
.page-faq .faq-section + .faq-section {
  border-top: 1px solid var(--line);
}
.page-faq .section-head {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "index kicker"
    "index title";
  column-gap: 18px;
  row-gap: 8px;
  align-items: start;
  margin-bottom: 26px;
}
.page-faq .section-head__index {
  grid-area: index;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: .92;
  color: var(--teal-500);
}
.page-faq .section-head__kicker {
  grid-area: kicker;
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--metal-500);
}
.page-faq .section-head__title {
  grid-area: title;
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-faq .faq-section__lead {
  max-width: 68ch;
  margin: 0 0 30px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--faq-muted);
}

/* ---------- 分类索引 ---------- */
.page-faq .cat-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-faq .cat-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 18px 20px;
  background: var(--white);
  border-top: 3px solid var(--line);
  transition: transform .18s var(--ease);
}
.page-faq .cat-card:hover {
  transform: translateY(-2px);
}
.page-faq .cat-card--s1 { border-top-color: var(--indigo-700); }
.page-faq .cat-card--s2 { border-top-color: var(--teal-500); }
.page-faq .cat-card--s3 { border-top-color: var(--amber-500); }
.page-faq .cat-card--s4 { border-top-color: var(--metal-500); }
.page-faq .cat-card--s5 { border-top-color: var(--verify); }
.page-faq .cat-card__code {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .06em;
  padding: 3px 8px;
  border: 1px solid currentColor;
}
.page-faq .cat-card--s1 .cat-card__code { color: var(--indigo-700); }
.page-faq .cat-card--s2 .cat-card__code { color: var(--teal-700); }
.page-faq .cat-card--s3 .cat-card__code { color: var(--amber-700); }
.page-faq .cat-card--s4 .cat-card__code { color: var(--faq-s4); }
.page-faq .cat-card--s5 .cat-card__code { color: var(--verify); }
.page-faq .cat-card__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 21px;
  line-height: 1.2;
  color: var(--ink);
}
.page-faq .cat-card__desc {
  flex: 1 1 auto;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--faq-muted);
}
.page-faq .cat-card__link {
  align-self: flex-start;
  padding-bottom: 2px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--teal-700);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}
.page-faq .cat-card__link:hover {
  color: var(--indigo-900);
}

/* ---------- 问答区布局 ---------- */
.page-faq .qa-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
.page-faq .qa-rail__title {
  margin: 0 0 12px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--metal-500);
}
.page-faq .qa-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-faq .qa-filter {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 12px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: background .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}
.page-faq .qa-filter:hover {
  border-color: var(--metal-500);
  border-left-color: var(--metal-500);
}
.page-faq .qa-filter--s1 { border-left-color: var(--indigo-700); }
.page-faq .qa-filter--s2 { border-left-color: var(--teal-500); }
.page-faq .qa-filter--s3 { border-left-color: var(--amber-500); }
.page-faq .qa-filter--s4 { border-left-color: var(--metal-500); }
.page-faq .qa-filter--s5 { border-left-color: var(--verify); }
.page-faq .qa-filter.is-active {
  background: var(--indigo-900);
  border-color: var(--indigo-900);
  border-left-color: var(--teal-500);
  color: var(--text-dark-1);
}
.page-faq .qa-filter__count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--metal-500);
}
.page-faq .qa-filter.is-active .qa-filter__count {
  color: var(--teal-500);
}

.page-faq .qa-body {
  min-width: 0;
}
.page-faq .qa-group {
  margin-bottom: 48px;
}
.page-faq .qa-group:last-child {
  margin-bottom: 0;
}
.page-faq .qa-group__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ink);
}
.page-faq .qa-group__index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--metal-500);
}
.page-faq .qa-group__title {
  flex: 1 1 auto;
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 22px;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-faq .qa-group__note {
  max-width: 62ch;
  margin: 12px 0 18px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--faq-muted);
}

/* ---------- 手风琴条目 ---------- */
.page-faq .qa-list {
  display: grid;
  gap: 8px;
}
.page-faq .qa-figure {
  margin: 0 0 20px;
  border: 1px solid var(--line);
  background: var(--indigo-800);
}
.page-faq .qa-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-faq .qa-figure .media__caption {
  display: block;
  padding: 9px 12px;
  background: var(--white);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--metal-500);
}
.page-faq .qa {
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
}
.page-faq .qa[data-filter-tag="s1"] { border-left-color: var(--indigo-700); }
.page-faq .qa[data-filter-tag="s2"] { border-left-color: var(--teal-500); }
.page-faq .qa[data-filter-tag="s3"] { border-left-color: var(--amber-500); }
.page-faq .qa[data-filter-tag="s4"] { border-left-color: var(--metal-500); }
.page-faq .qa[data-filter-tag="s5"] { border-left-color: var(--verify); }
.page-faq .qa[hidden] {
  display: none;
}
.page-faq .qa__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 12px;
  padding: 14px 16px;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--ink);
  transition: background .16s var(--ease);
}
.page-faq .qa__sum::-webkit-details-marker { display: none; }
.page-faq .qa__sum::marker { content: ""; }
.page-faq .qa__sum:hover { background: rgba(15, 181, 166, .06); }
.page-faq .qa__sum:focus-visible {
  outline: 2px solid var(--teal-500);
  outline-offset: -2px;
}
.page-faq .qa__code {
  flex: 0 0 auto;
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .04em;
  border: 1px solid currentColor;
  white-space: nowrap;
}
.page-faq .qa[data-filter-tag="s1"] .qa__code { color: var(--indigo-700); }
.page-faq .qa[data-filter-tag="s2"] .qa__code { color: var(--teal-700); }
.page-faq .qa[data-filter-tag="s3"] .qa__code { color: var(--amber-700); }
.page-faq .qa[data-filter-tag="s4"] .qa__code { color: var(--faq-s4); }
.page-faq .qa[data-filter-tag="s5"] .qa__code { color: var(--verify); }
.page-faq .qa__q {
  flex: 1 1 auto;
  min-width: 0;
}
.page-faq .qa__arrow {
  flex: 0 0 auto;
  align-self: center;
  width: 8px;
  height: 8px;
  margin-left: auto;
  border-right: 1.5px solid var(--metal-500);
  border-bottom: 1.5px solid var(--metal-500);
  transform: rotate(45deg);
  transition: transform .2s var(--ease);
}
.page-faq .qa[open] .qa__arrow {
  transform: rotate(-135deg);
}
.page-faq .qa__body {
  padding: 14px 16px 18px;
  border-top: 1px solid var(--line);
}
.page-faq .qa__conclusion {
  margin: 0 0 10px;
  padding-left: 12px;
  border-left: 2px solid var(--teal-500);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.7;
  color: var(--ink);
}
.page-faq .qa__basis {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--faq-muted);
}
.page-faq .qa__basis:last-child {
  margin-bottom: 0;
}

/* ---------- 核验步骤与行动区 ---------- */
.page-faq .verify-list {
  display: grid;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.page-faq .verify-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.page-faq .verify-step__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 22px;
  line-height: 1.1;
  color: var(--teal-500);
}
.page-faq .verify-step__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.25;
  color: var(--ink);
}
.page-faq .verify-step__text {
  margin: 0;
  max-width: 74ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--faq-muted);
}
.page-faq .faq-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 22px 24px;
  background: var(--indigo-900);
  border-left: 3px solid var(--amber-500);
}
.page-faq .faq-cta__text {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-dark-2);
}
.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 断点 ---------- */
@media (min-width: 600px) {
  .page-faq .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .page-faq .faq-hero__facts { grid-template-columns: repeat(4, 1fr); }
}

@media (min-width: 920px) {
  .page-faq .faq-hero__grid { grid-template-columns: 5fr 7fr; gap: 56px; }
  .page-faq .faq-hero { padding-top: 56px; }
}

@media (min-width: 960px) {
  .page-faq .cat-grid { grid-template-columns: repeat(3, 1fr); }
  .page-faq .faq-section { padding: 72px 0; }
}

@media (min-width: 1000px) {
  .page-faq .qa-layout {
    grid-template-columns: var(--faq-rail) 1fr;
    gap: 48px;
    align-items: start;
  }
  .page-faq .qa-rail {
    position: sticky;
    top: calc(var(--top-h) + 24px);
  }
  .page-faq .qa-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 6px;
  }
  .page-faq .qa-filter { width: 100%; }
}

@media (min-width: 1260px) {
  .page-faq .cat-grid { grid-template-columns: repeat(5, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .cat-card,
  .page-faq .qa-filter,
  .page-faq .qa__sum,
  .page-faq .qa__arrow {
    transition: none;
  }
  .page-faq .cat-card:hover { transform: none; }
}