.page-faq {
  --faq-sticky-top: calc(var(--header-h) + 28px);
  --faq-pad: clamp(16px, 2.4vw, 26px);
  background: var(--c-bg);
}

/* ---------- 开场 ---------- */

.page-faq .faq-intro {
  position: relative;
  padding: clamp(28px, 5vw, 64px) 0 clamp(26px, 4vw, 46px);
  background:
    linear-gradient(180deg, rgba(111, 168, 220, 0.16), rgba(242, 246, 250, 0) 78%),
    var(--c-bg);
  overflow: hidden;
}

.page-faq .faq-intro::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(111, 168, 220, 0.22) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(111, 168, 220, 0.22) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 82%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 82%);
  pointer-events: none;
}

.page-faq .faq-intro .shell {
  position: relative;
  z-index: 1;
}

.page-faq .faq-intro__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 46px);
  margin-top: clamp(18px, 2.5vw, 28px);
}

.page-faq .faq-intro__lead .eyebrow {
  margin-bottom: 12px;
  color: var(--c-sel);
}

.page-faq .faq-intro__lead .h-display {
  max-width: 20ch;
  color: var(--c-hi);
}

.page-faq .faq-intro__lead .p-lead {
  margin: clamp(14px, 2vw, 20px) 0 0;
  max-width: 64ch;
  color: var(--c-body);
}

.page-faq .faq-intro__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 14px;
  border-top: 1px solid var(--c-line);
  padding-top: 18px;
}

.page-faq .faq-intro__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-faq .faq-intro__stats .stat__value {
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  color: var(--c-hi);
  letter-spacing: 0.02em;
}

.page-faq .faq-intro__stats .stat__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--c-body);
}

/* ---------- 主体骨架 ---------- */

.page-faq .faq-deck {
  padding: clamp(22px, 3vw, 40px) 0 clamp(30px, 4vw, 56px);
}

.page-faq .faq-deck__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

/* ---------- 左侧主题索引 ---------- */

.page-faq .faq-rail {
  min-width: 0;
}

.page-faq .faq-rail__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--c-body);
}

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

.page-faq .faq-rail__list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-rail__link {
  flex: none;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 15px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-line);
  background: var(--c-surface);
  color: var(--c-body-strong);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-faq .faq-rail__link .mono {
  font-size: 11px;
  color: var(--c-sel);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-color: var(--c-mist);
  color: var(--c-hi);
}

.page-faq .faq-rail__link[data-current="true"] {
  border-color: var(--c-amber);
  background: rgba(245, 158, 11, 0.1);
  color: var(--c-hi);
}

/* ---------- 章节 ---------- */

.page-faq .faq-flow {
  min-width: 0;
  display: grid;
  gap: clamp(34px, 5vw, 64px);
}

.page-faq .faq-block {
  min-width: 0;
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-block__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: clamp(14px, 2vw, 24px);
  row-gap: 8px;
  align-items: start;
  margin-bottom: clamp(20px, 2.6vw, 30px);
}

.page-faq .faq-block__head .index-num {
  grid-row: 1 / span 2;
  align-self: start;
  font-size: clamp(38px, 6.4vw, 68px);
  line-height: 0.86;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--c-mist);
  letter-spacing: 0.02em;
}

.page-faq .faq-block__head .h-section {
  margin: 0;
  color: var(--c-hi);
}

.page-faq .faq-block__head .p-body {
  margin: 0;
  max-width: 62ch;
  color: var(--c-body);
}

/* ---------- 手风琴 ---------- */

.page-faq .faq-qa-list {
  display: grid;
  gap: 10px;
}

.page-faq .qa {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color 0.22s ease, box-shadow 0.22s ease;
}

.page-faq .qa[open] {
  border-color: var(--c-mist);
  box-shadow: 0 12px 30px rgba(11, 59, 111, 0.08);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 17px var(--faq-pad);
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.5vw, 17px);
  font-weight: 600;
  line-height: 1.6;
  color: var(--c-ink);
}

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

.page-faq .qa__q::marker {
  content: "";
}

.page-faq .qa__q::after {
  content: "+";
  flex: none;
  margin-left: auto;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 400;
  line-height: 1;
  color: var(--c-sel);
  transition: transform 0.25s ease, color 0.25s ease;
}

.page-faq .qa[open] .qa__q::after {
  transform: rotate(45deg);
  color: var(--c-amber);
}

.page-faq .qa__num {
  flex: none;
  width: 30px;
  padding-top: 3px;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--c-sel);
}

.page-faq .qa__a {
  padding: 0 var(--faq-pad) 20px;
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-body);
}

/* ---------- 配图 ---------- */

.page-faq .faq-figure {
  margin: clamp(22px, 3vw, 34px) 0 0;
}

.page-faq .faq-figure .media {
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--c-line);
}

.page-faq .faq-figure--square .media {
  max-width: 420px;
}

.page-faq .faq-figure__cap {
  margin-top: 11px;
  max-width: 62ch;
  font-size: 13px;
  line-height: 1.72;
  color: var(--c-body);
}

/* ---------- 步骤 ---------- */

.page-faq .faq-steps {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-steps__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 5px;
  align-items: start;
  padding: 17px var(--faq-pad);
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-sel);
  border-radius: var(--r-md);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-faq .faq-steps__item:hover {
  border-color: var(--c-mist);
  border-left-color: var(--c-amber);
}

.page-faq .faq-steps__num {
  grid-row: 1 / span 2;
  padding-top: 2px;
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--c-sel);
}

.page-faq .faq-steps__item .h-card {
  margin: 0;
  color: var(--c-hi);
}

.page-faq .faq-steps__item p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-body);
}

/* ---------- 结尾 ---------- */

.page-faq .faq-outro {
  padding: clamp(10px, 2vw, 24px) 0 clamp(52px, 7vw, 92px);
}

.page-faq .faq-outro__panel {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4.4vw, 54px);
  background: var(--c-deep);
  border-radius: var(--r-lg);
  color: var(--c-on-deep);
}

.page-faq .faq-outro__panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(34, 211, 238, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 211, 238, 0.09) 1px, transparent 1px);
  background-size: 52px 52px;
  pointer-events: none;
}

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

.page-faq .faq-outro__panel .eyebrow {
  margin-bottom: 12px;
  color: var(--c-cyan);
}

.page-faq .faq-outro__panel .h-section {
  margin: 0;
  max-width: 24ch;
  color: var(--c-surface);
}

.page-faq .faq-outro__panel .p-body {
  margin: clamp(12px, 1.8vw, 18px) 0 0;
  max-width: 60ch;
  color: var(--c-on-deep-soft);
}

.page-faq .faq-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 28px);
}

.page-faq .faq-outro__contact {
  margin: clamp(20px, 2.6vw, 26px) 0 0;
  font-size: 13.5px;
  letter-spacing: 0.03em;
  color: var(--c-cyan);
  overflow-wrap: anywhere;
}

.page-faq .faq-outro__note {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-on-deep-soft);
}

.page-faq .faq-outro__note a {
  color: var(--c-mist);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-outro__note a:hover,
.page-faq .faq-outro__note a:focus-visible {
  color: var(--c-cyan);
}

/* ---------- 平板以上 ---------- */

@media (min-width: 680px) {
  .page-faq .qa__a {
    padding-left: calc(var(--faq-pad) + 44px);
  }

  .page-faq .faq-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-steps__item:last-child {
    grid-column: 1 / -1;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 960px) {
  .page-faq .faq-intro__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-faq .faq-deck__grid {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(36px, 4vw, 56px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-sticky-top);
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 1px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    padding: 9px 0 9px 14px;
    font-size: 14px;
    white-space: normal;
  }

  .page-faq .faq-rail__link[data-current="true"] {
    border-left-color: var(--c-amber);
    background: transparent;
    font-weight: 600;
  }

  .page-faq .faq-figure {
    margin-top: clamp(28px, 3.4vw, 40px);
  }
}

/* ---------- 大屏 ---------- */

@media (min-width: 1180px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-steps__item:last-child {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__q::after,
  .page-faq .faq-steps__item,
  .page-faq .faq-rail__link {
    transition: none;
  }
}