.page-faq {
  --faq-rail-w: 224px;
  padding: 22px 0 88px;
  color: var(--paper);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  margin: 16px 0 0;
  padding: 30px 22px 28px;
  background: linear-gradient(142deg, rgba(27, 67, 104, .92) 0%, rgba(6, 20, 38, .96) 58%, rgba(4, 16, 31, 1) 100%);
  border: 1px solid var(--line);
  border-left: 5px solid var(--clay);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: linear-gradient(118deg, #000 0%, transparent 72%);
  mask-image: linear-gradient(118deg, #000 0%, transparent 72%);
  pointer-events: none;
}

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

.page-faq .faq-hero__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: 0 0 16px;
  max-width: 22ch;
  font-size: clamp(29px, 5.2vw, 52px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.01em;
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(237, 230, 214, .84);
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 34px;
  margin: 26px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-hero__stats .stat {
  min-width: 118px;
}

.page-faq .faq-hero__stats .stat__value {
  font-size: clamp(22px, 3.4vw, 30px);
}

/* ---------- 双栏骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: 28px;
  margin-top: 36px;
}

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

@media (min-width: 980px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }
}

/* ---------- 分类锚点 ---------- */
.page-faq .faq-rail {
  padding: 16px 14px 14px;
  background: rgba(14, 42, 71, .58);
  border: 1px solid var(--line);
}

@media (min-width: 980px) {
  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--top-h) + 20px);
  }
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--clay);
}

.page-faq .faq-rail__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail__link {
  position: relative;
  display: block;
  padding: 9px 8px 9px 14px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--stone);
  text-decoration: none;
  transition: color .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .faq-rail__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  bottom: 7px;
  width: 3px;
  background: var(--rail-accent, var(--clay));
  opacity: .4;
  transition: opacity .2s var(--ease), width .2s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--paper);
  background: rgba(27, 67, 104, .42);
}

.page-faq .faq-rail__link:hover::before,
.page-faq .faq-rail__link:focus-visible::before {
  opacity: 1;
  width: 4px;
}

.page-faq .faq-rail__list > li:nth-child(1) .faq-rail__link { --rail-accent: var(--orange); }
.page-faq .faq-rail__list > li:nth-child(2) .faq-rail__link { --rail-accent: var(--cyan); }
.page-faq .faq-rail__list > li:nth-child(3) .faq-rail__link { --rail-accent: var(--moss); }
.page-faq .faq-rail__list > li:nth-child(4) .faq-rail__link { --rail-accent: var(--clay); }
.page-faq .faq-rail__list > li:nth-child(5) .faq-rail__link { --rail-accent: var(--coral); }
.page-faq .faq-rail__list > li:nth-child(6) .faq-rail__link { --rail-accent: var(--steel); }

.page-faq .faq-rail__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

@media (max-width: 979px) {
  .page-faq .faq-rail__list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
  }

  .page-faq .faq-rail__list li {
    flex: none;
  }

  .page-faq .faq-rail__link {
    white-space: nowrap;
    background: rgba(27, 67, 104, .35);
  }
}

/* ---------- 章节 ---------- */
.page-faq .faq-block {
  margin-bottom: 44px;
  scroll-margin-top: calc(var(--top-h) + 24px);
}

.page-faq .faq-block__head {
  display: grid;
  gap: 6px;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-block__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--orange);
}

.page-faq .faq-block__title {
  margin: 0;
  font-size: clamp(21px, 3vw, 28px);
  font-weight: 900;
  line-height: 1.25;
}

.page-faq .faq-block__desc {
  margin: 2px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

@media (min-width: 640px) {
  .page-faq .faq-block__head {
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: 14px;
    row-gap: 4px;
  }

  .page-faq .faq-block__no {
    grid-row: 1;
    grid-column: 1;
  }

  .page-faq .faq-block__title {
    grid-row: 1;
    grid-column: 2;
  }

  .page-faq .faq-block__desc {
    grid-row: 2;
    grid-column: 2;
  }
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 20px;
}

/* ---------- 问答折叠块 ---------- */
.page-faq .qa-list {
  display: grid;
  gap: 10px;
}

.page-faq .qa {
  background: rgba(6, 20, 38, .58);
  border: 1px solid var(--line-soft);
  transition: border-color .25s var(--ease), background-color .25s var(--ease);
}

.page-faq .qa:hover {
  border-color: var(--line);
}

.page-faq .qa[open] {
  background: rgba(14, 42, 71, .62);
  border-color: rgba(255, 106, 26, .42);
}

.page-faq .qa__q {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--paper);
}

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

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

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .qa__icon {
  position: relative;
  flex: none;
  width: 22px;
  height: 22px;
  border: 1px solid var(--line-strong);
  transition: border-color .25s var(--ease);
}

.page-faq .qa__icon::before,
.page-faq .qa__icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--cyan);
  transition: transform .3s var(--ease), opacity .3s var(--ease), background-color .3s var(--ease);
}

.page-faq .qa__icon::before {
  width: 10px;
  height: 2px;
  transform: translate(-50%, -50%);
}

.page-faq .qa__icon::after {
  width: 2px;
  height: 10px;
  transform: translate(-50%, -50%);
}

.page-faq .qa[open] .qa__icon {
  border-color: var(--orange);
}

.page-faq .qa[open] .qa__icon::before {
  background: var(--orange);
}

.page-faq .qa[open] .qa__icon::after {
  opacity: 0;
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .qa__a {
  margin: 0 16px;
  padding: 14px 0 18px;
  border-top: 1px dashed var(--line);
  font-size: 15px;
  line-height: 1.78;
  color: rgba(237, 230, 214, .84);
}

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

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

.page-faq .qa__a ul {
  margin: 10px 0 0;
  padding-left: 18px;
}

.page-faq .qa__a li {
  margin-bottom: 6px;
}

.page-faq .qa__a li::marker {
  color: var(--clay);
}

/* ---------- 术语表 ---------- */
.page-faq .term-wrap {
  overflow-x: auto;
  background: rgba(6, 20, 38, .5);
  border: 1px solid var(--line);
}

.page-faq .term-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 14.5px;
}

.page-faq .term-table th,
.page-faq .term-table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-soft);
  line-height: 1.68;
}

.page-faq .term-table thead th {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  white-space: nowrap;
  color: var(--cyan);
  background: rgba(14, 42, 71, .88);
  border-bottom: 1px solid var(--line);
}

.page-faq .term-table tbody tr:nth-child(even) {
  background: rgba(14, 42, 71, .4);
}

.page-faq .term-table tbody tr:hover {
  background: rgba(27, 67, 104, .5);
}

.page-faq .term-table tbody tr:last-child td {
  border-bottom: none;
}

.page-faq .term-table td:first-child {
  white-space: nowrap;
  font-weight: 700;
  color: var(--orange);
}

.page-faq .term-table td:nth-child(3) {
  color: var(--stone);
}

/* ---------- 联系引导 ---------- */
.page-faq .faq-help {
  display: grid;
  gap: 18px;
  margin-top: 4px;
  padding: 26px 22px;
  background: linear-gradient(158deg, rgba(14, 42, 71, .92), rgba(6, 20, 38, .96));
  border: 1px solid var(--line);
  border-top: 4px solid var(--orange);
}

.page-faq .faq-help h2 {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.8vw, 26px);
  font-weight: 900;
  line-height: 1.3;
}

.page-faq .faq-help p {
  margin: 0 0 8px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(237, 230, 214, .82);
}

.page-faq .faq-help__contact {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  align-items: baseline;
  margin-top: 12px;
  font-size: 14px;
  color: var(--paper);
}

.page-faq .faq-help__contact .num {
  color: var(--cyan);
}

.page-faq .faq-help__sep {
  color: var(--stone);
}

.page-faq .faq-help .btn {
  justify-self: start;
}

@media (min-width: 760px) {
  .page-faq .faq-help {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 30px;
    padding: 30px 28px;
  }

  .page-faq .faq-help .btn {
    justify-self: end;
  }
}

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