.page-faq {
  --faq-gap: clamp(14px, 2.2vw, 22px);
  --faq-cut: 12px;
  --faq-accent: var(--kb-cyan);
  --faq-sticky: calc(var(--kb-header-h) + 26px);
  padding-bottom: var(--kb-block);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(30px, 5.4vw, 68px) 0 clamp(26px, 4vw, 46px);
  border-bottom: 1px solid var(--kb-line);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: -10% -4% auto auto;
  width: min(46vw, 520px);
  height: 190%;
  background-image: repeating-linear-gradient(
    45deg,
    transparent 0 24px,
    rgba(56, 242, 208, 0.07) 24px 25px
  );
  pointer-events: none;
  z-index: 0;
}

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

.page-faq .faq-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--kb-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--kb-cyan);
}

.page-faq .faq-hero h1 {
  margin: 0 0 20px;
  max-width: 22ch;
  font-family: var(--kb-serif);
  font-weight: 700;
  font-size: clamp(29px, 6.2vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--kb-chalk);
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 2.3vw, 17px);
  line-height: 1.78;
  color: var(--kb-gray);
}

.page-faq .faq-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--kb-hair);
}

.page-faq .faq-facts__item {
  font-family: var(--kb-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--kb-gray);
}

.page-faq .faq-facts__item b {
  font-weight: 700;
  color: var(--kb-chalk);
}

/* ---------- 分组索引 ---------- */
.page-faq .faq-index {
  padding: clamp(32px, 5vw, 58px) 0 clamp(20px, 3vw, 34px);
}

.page-faq .faq-index__title {
  margin: 0 0 20px;
  font-family: var(--kb-ui);
  font-weight: 900;
  font-size: clamp(18px, 2.6vw, 25px);
  letter-spacing: 0.01em;
  color: var(--kb-chalk);
}

.page-faq .faq-index__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__link {
  display: block;
  height: 100%;
  padding: 16px 18px 18px;
  text-decoration: none;
  background: var(--kb-deep);
  border-left: 3px solid var(--kb-cyan);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
  transition: transform 160ms ease, background-color 160ms ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  background: var(--kb-track);
  transform: translateY(-3px);
}

.page-faq .faq-index__item:nth-child(2) .faq-index__link { border-left-color: var(--kb-orange); }
.page-faq .faq-index__item:nth-child(3) .faq-index__link { border-left-color: var(--kb-moss); }
.page-faq .faq-index__item:nth-child(4) .faq-index__link { border-left-color: var(--kb-clay); }
.page-faq .faq-index__item:nth-child(5) .faq-index__link { border-left-color: var(--kb-chalk); }
.page-faq .faq-index__item:nth-child(6) .faq-index__link { border-left-color: var(--kb-cyan); }

.page-faq .faq-index__no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--kb-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--kb-gray);
}

.page-faq .faq-index__name {
  display: block;
  margin-bottom: 8px;
  font-family: var(--kb-ui);
  font-weight: 900;
  font-size: 16px;
  line-height: 1.35;
  color: var(--kb-chalk);
}

.page-faq .faq-index__q {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--kb-gray);
}

/* ---------- 问答墙 ---------- */
.page-faq .faq-wall {
  padding-top: clamp(14px, 2vw, 22px);
}

.page-faq .faq-rail {
  display: none;
}

.page-faq .faq-rail__title {
  margin: 0 0 14px;
  font-family: var(--kb-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--kb-gray);
}

.page-faq .faq-rail__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--kb-line);
}

.page-faq .faq-rail__list a {
  display: flex;
  gap: 10px;
  margin-left: -1px;
  padding: 9px 6px 9px 14px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.5;
  color: var(--kb-gray);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  color: var(--kb-cyan);
  border-left-color: var(--kb-cyan);
}

.page-faq .faq-rail__list span {
  font-family: var(--kb-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--kb-moss);
}

/* ---------- 分组面板 ---------- */
.page-faq .faq-group {
  position: relative;
  margin-bottom: clamp(18px, 3vw, 32px);
  padding: clamp(20px, 3.2vw, 36px) clamp(16px, 2.8vw, 32px) clamp(8px, 1.6vw, 16px);
  background: var(--kb-deep);
  scroll-margin-top: calc(var(--kb-header-h) + 20px);
  clip-path: polygon(0 0, calc(100% - var(--kb-cut)) 0, 100% var(--kb-cut), 100% 100%, 0 100%);
}

.page-faq .faq-group__head {
  padding-bottom: 16px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--kb-hair);
}

.page-faq .faq-group__no {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--kb-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--kb-cyan);
}

.page-faq .faq-group__title {
  margin: 0 0 10px;
  font-family: var(--kb-ui);
  font-weight: 900;
  font-size: clamp(19px, 2.8vw, 26px);
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--kb-chalk);
}

.page-faq .faq-group__note {
  margin: 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.72;
  color: var(--kb-gray);
}

.page-faq .faq-group--subscribe .faq-group__no { color: var(--kb-orange); }
.page-faq .faq-group--data .faq-group__no { color: var(--kb-moss); }
.page-faq .faq-group--android .faq-group__no { color: var(--kb-clay); }
.page-faq .faq-group--account .faq-group__no { color: var(--kb-chalk); }
.page-faq .faq-group--contact .faq-group__no { color: var(--kb-cyan); }

/* ---------- 问题条目 ---------- */
.page-faq .faq-item {
  border-left: 2px solid var(--kb-line);
  transition: border-color 160ms ease;
}

.page-faq .faq-item + .faq-item {
  border-top: 1px solid var(--kb-hair);
}

.page-faq .faq-item[open] {
  border-left-color: var(--kb-cyan);
}

.page-faq .faq-item__q {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 38px 15px 13px;
  cursor: pointer;
  list-style: none;
  font-family: var(--kb-ui);
  font-weight: 700;
  font-size: clamp(15px, 2.15vw, 16.5px);
  line-height: 1.6;
  color: var(--kb-chalk);
  transition: color 160ms ease;
}

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

.page-faq .faq-item[open] .faq-item__q {
  color: var(--kb-cyan);
}

.page-faq .faq-item__no {
  flex: 0 0 auto;
  padding-top: 3px;
  font-family: var(--kb-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--kb-gray);
}

.page-faq .faq-item__mark {
  position: absolute;
  top: 50%;
  right: 12px;
  width: 11px;
  height: 11px;
  margin-top: -7px;
  border-right: 2px solid var(--kb-gray);
  border-bottom: 2px solid var(--kb-gray);
  transform: rotate(45deg);
  transition: transform 180ms ease, border-color 180ms ease;
}

.page-faq .faq-item[open] .faq-item__mark {
  border-color: var(--kb-cyan);
  transform: rotate(-135deg);
}

.page-faq .faq-item__a {
  padding: 0 38px 18px 13px;
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--kb-chalk);
  opacity: 0.86;
}

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

.page-faq .faq-item__a a {
  color: var(--kb-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 208, 0.4);
  transition: border-color 140ms ease;
}

.page-faq .faq-item__a a:hover,
.page-faq .faq-item__a a:focus-visible {
  border-bottom-color: var(--kb-cyan);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 20px 0 6px;
}

.page-faq .faq-band {
  margin: 0 0 clamp(20px, 3vw, 34px);
}

.page-faq .faq-figure img,
.page-faq .faq-band img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.04);
}

.page-faq .faq-figure .kb-figure__caption {
  color: var(--kb-gray);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1020px) {
  .page-faq .faq-index__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-wall {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 58px);
    align-items: start;
    padding-top: clamp(20px, 3vw, 38px);
  }

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

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

  .page-faq .faq-figure {
    margin: 22px 0 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__link,
  .page-faq .faq-item,
  .page-faq .faq-item__mark,
  .page-faq .faq-item__q,
  .page-faq .faq-rail__list a {
    transition: none;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    transform: none;
  }
}