.page-faq {
  --faq-index-top: 104px;
}

/* ===== 首屏 ===== */
.page-faq .faq-hero {
  position: relative;
  background: var(--c-ink);
  color: var(--c-paper);
  border-bottom: var(--bd) solid var(--c-flame);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -10%;
  right: -18%;
  width: 56%;
  height: 120%;
  background: var(--c-flame);
  opacity: .16;
  transform: skewX(-12deg);
  pointer-events: none;
}

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

.page-faq .faq-hero .breadcrumb {
  padding-top: 20px;
}

.page-faq .faq-hero .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
}

.page-faq .faq-hero .breadcrumb__link {
  color: rgba(246, 243, 239, .72);
  text-decoration: none;
}

.page-faq .faq-hero .breadcrumb__link:hover {
  color: var(--c-flame);
}

.page-faq .faq-hero .breadcrumb__sep {
  color: rgba(246, 243, 239, .35);
}

.page-faq .faq-hero .breadcrumb__current {
  color: var(--c-flame);
}

.page-faq .faq-hero__inner {
  padding: 24px 0 48px;
}

.page-faq .faq-hero__kicker {
  margin: 0;
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  letter-spacing: .18em;
  color: var(--c-flame);
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 68px);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--c-paper);
  max-width: 17ch;
}

.page-faq .faq-hero__lead {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: rgba(246, 243, 239, .8);
}

.page-faq .faq-hero__actions {
  margin-top: 28px;
}

/* ===== 双栏骨架 ===== */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-top: 36px;
  padding-bottom: 72px;
}

/* ===== 左侧索引 ===== */
.page-faq .faq-index {
  background: var(--c-night);
  border: var(--bd) solid var(--c-ink);
  box-shadow: var(--sh-md);
  padding: 18px 16px 16px;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--c-cyan);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-index__item {
  flex: 0 0 auto;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border-left: 3px solid transparent;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  background: rgba(45, 212, 191, .12);
  border-left-color: var(--c-flame);
}

.page-faq .faq-index__num {
  font-family: var(--f-mono);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--c-flame);
}

.page-faq .faq-index__label {
  font-family: var(--f-sans);
  font-size: var(--fs-14);
  font-weight: 500;
  line-height: 1.4;
  color: var(--c-paper);
}

.page-faq .faq-index__foot {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 2px solid rgba(255, 255, 255, .16);
}

.page-faq .faq-index__foot-text {
  margin: 0 0 8px;
  font-size: var(--fs-12);
  color: rgba(246, 243, 239, .66);
}

.page-faq .faq-index__copy {
  display: block;
  width: 100%;
  padding: 8px 10px;
  background: transparent;
  border: 2px solid var(--c-flame);
  color: var(--c-flame);
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  line-height: 1.4;
  text-align: left;
  word-break: break-all;
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-faq .faq-index__copy:hover {
  background: var(--c-flame);
  color: var(--c-ink);
}

.page-faq .faq-index__copy[data-copied="true"] {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  color: var(--c-ink);
}

/* ===== 右侧问答 ===== */
.page-faq .faq-tools {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 30px;
}

.page-faq .faq-tools__label {
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--c-tungsten);
}

.page-faq .faq-tools__input {
  width: 100%;
  padding: 12px 14px;
  background: var(--c-white);
  border: var(--bd) solid var(--c-ink);
  font-family: var(--f-sans);
  font-size: var(--fs-17);
  color: var(--c-ink);
}

.page-faq .faq-tools__input::placeholder {
  color: var(--c-tungsten);
}

.page-faq .faq-tools__input:focus {
  outline: none;
  border-color: var(--c-flame);
  box-shadow: var(--sh-sm);
}

.page-faq .faq-group {
  scroll-margin-top: 110px;
  margin-bottom: 52px;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  margin-bottom: 20px;
  border-bottom: var(--bd) solid var(--c-ink);
}

.page-faq .faq-group__num {
  font-family: var(--f-mono);
  font-weight: 700;
  font-size: var(--fs-34);
  line-height: 1;
  color: var(--c-flame);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--f-sans);
  font-weight: 900;
  font-size: var(--fs-20);
  line-height: 1.3;
  color: var(--c-ink);
}

.page-faq .faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ===== 折叠项 ===== */
.page-faq .faq-item {
  position: relative;
  background: var(--c-white);
  border: var(--bd) solid var(--c-ink);
  transition: box-shadow var(--t-mid) var(--ease);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 0;
  background: var(--c-flame);
  transition: width var(--t-mid) var(--ease);
}

.page-faq .faq-item:hover {
  box-shadow: var(--sh-sm);
}

.page-faq .faq-item[open] {
  box-shadow: var(--sh-md);
}

.page-faq .faq-item[open]::before {
  width: 8px;
}

.page-faq .faq-item__q {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 46px 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item__q::after {
  content: "+";
  position: absolute;
  top: 13px;
  right: 16px;
  font-family: var(--f-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-flame);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "\2212";
}

.page-faq .faq-item__q:focus-visible {
  outline: 3px solid var(--c-cyan);
  outline-offset: 2px;
}

.page-faq .faq-item__code {
  flex: 0 0 auto;
  font-family: var(--f-mono);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: .04em;
  color: var(--c-tungsten);
}

.page-faq .faq-item[open] .faq-item__code {
  color: var(--c-flame);
}

.page-faq .faq-item__text {
  font-family: var(--f-sans);
  font-weight: 700;
  font-size: var(--fs-17);
  line-height: 1.5;
  color: var(--c-ink);
}

.page-faq .faq-item__a {
  position: relative;
  z-index: 1;
  max-width: 36em;
  padding: 0 22px 20px 18px;
}

.page-faq .faq-item__a::before {
  content: "";
  display: block;
  height: 2px;
  margin-bottom: 14px;
  background: var(--c-iron);
  opacity: .16;
}

.page-faq .faq-item__a p {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--c-iron);
}

.page-faq .faq-item__a a {
  color: var(--c-lava);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-item__a a:hover {
  color: var(--c-flame);
}

/* ===== 配图 ===== */
.page-faq .faq-figure {
  margin: 22px 0 8px;
}

/* ===== 桌面端 ===== */
@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    padding: 40px 0 76px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 264px minmax(0, 1fr);
    gap: 52px;
    padding-top: 48px;
    padding-bottom: 96px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: var(--faq-index-top);
    padding: 22px 18px 18px;
  }

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

  .page-faq .faq-index__item {
    flex: 1 1 auto;
  }

  .page-faq .faq-index__link {
    padding: 9px 10px;
    white-space: normal;
  }

  .page-faq .faq-group {
    margin-bottom: 64px;
  }

  .page-faq .faq-group__title {
    font-size: var(--fs-26);
  }

  .page-faq .faq-item__text {
    font-size: var(--fs-20);
  }
}

@media (max-width: 480px) {
  .page-faq .faq-item__code {
    font-size: var(--fs-12);
  }

  .page-faq .faq-item__text {
    font-size: var(--fs-14);
  }

  .page-faq .faq-item__a {
    padding: 0 16px 18px 16px;
  }
}