.page-faq {
  --faq-rail: 272px;
  display: block;
  color: var(--ky-text);
  overflow-x: hidden;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(18px, 3vw, 34px) 0 clamp(26px, 4vw, 50px);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -12% -6% auto -6%;
  height: 82%;
  background:
    radial-gradient(58% 78% at 10% 0%, rgba(34, 211, 238, 0.16), transparent 62%),
    repeating-linear-gradient(90deg, rgba(39, 54, 79, 0.5) 0 1px, transparent 1px 72px);
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
}

.page-faq .faq-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-faq .faq-hero h1 {
  margin: 0 0 16px;
  font-family: var(--ky-font-display);
  font-weight: 800;
  font-size: clamp(31px, 6.4vw, 68px);
  line-height: 1.03;
  letter-spacing: -0.015em;
  color: var(--ky-text);
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--ky-text-2);
}

.page-faq .faq-hero__facts {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  border-top: 1px solid var(--ky-line);
  border-bottom: 1px solid var(--ky-line);
}

.page-faq .faq-hero__facts > li {
  flex: 1 1 130px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 13px 14px 13px 0;
}

.page-faq .faq-hero__num {
  font-family: var(--ky-font-mono);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  color: var(--ky-cyan);
  letter-spacing: -0.02em;
}

.page-faq .faq-hero__unit {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--ky-text-2);
}

.page-faq .faq-hero__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--ky-line);
  background: var(--ky-ink-800);
  line-height: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 18, 32, 0) 56%, rgba(11, 18, 32, 0.8) 100%);
  pointer-events: none;
}

/* ---------- 主体双栏 ---------- */
.page-faq .faq-body {
  padding: clamp(24px, 4vw, 46px) 0 clamp(28px, 5vw, 58px);
}

.page-faq .faq-body__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

/* ---------- 索引轨道 ---------- */
.page-faq .faq-index {
  border: 1px solid var(--ky-line);
  border-top: 3px solid var(--ky-cyan);
  background: linear-gradient(180deg, var(--ky-ink-800), var(--ky-ink-900));
  padding: 16px 16px 18px;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-family: var(--ky-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--ky-text-2);
}

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

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  align-items: center;
  gap: 8px;
  padding: 11px 12px 11px 12px;
  border-left: 2px solid var(--ky-line);
  color: var(--ky-text-2);
  text-decoration: none;
  font-size: 14.5px;
  line-height: 1.4;
  transition: color 0.18s var(--ky-ease), background 0.18s var(--ky-ease), border-color 0.18s var(--ky-ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--ky-text);
  background: var(--ky-ink-700);
  border-left-color: var(--ky-cyan);
  outline: none;
}

.page-faq .faq-index__link:focus-visible {
  box-shadow: inset 0 0 0 2px var(--ky-cyan-dim);
}

.page-faq .faq-index__num {
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ky-cyan-dim);
}

.page-faq .faq-index__link:hover .faq-index__num,
.page-faq .faq-index__link:focus-visible .faq-index__num {
  color: var(--ky-cyan);
}

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

.page-faq .faq-index__count {
  font-family: var(--ky-font-mono);
  font-size: 11px;
  color: var(--ky-text-2);
  opacity: 0.75;
}

.page-faq .faq-index__help {
  margin-top: 18px;
  padding: 15px;
  border: 1px solid var(--ky-line);
  border-left: 3px solid var(--ky-orange);
  background: rgba(255, 138, 61, 0.07);
}

.page-faq .faq-index__help-title {
  margin: 0 0 6px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ky-text);
}

.page-faq .faq-index__help-text {
  margin: 0 0 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ky-text-2);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 88px;
}

.page-faq .faq-group + .faq-group {
  position: relative;
  margin-top: clamp(32px, 5vw, 60px);
  padding-top: clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--ky-line);
}

.page-faq .faq-group + .faq-group::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 78px;
  height: 2px;
  background: var(--ky-cyan);
}

.page-faq .faq-group__head {
  position: relative;
  padding-left: 18px;
  margin-bottom: clamp(16px, 2.5vw, 24px);
}

.page-faq .faq-group__head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 5px;
  height: calc(100% - 10px);
  max-height: 66px;
  background: linear-gradient(180deg, var(--ky-cyan), var(--ky-cyan-dim));
}

.page-faq .faq-group__tag {
  margin: 0 0 8px;
  font-family: var(--ky-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--ky-cyan);
}

.page-faq .faq-group__title {
  margin: 0 0 10px;
  font-family: var(--ky-font-display);
  font-weight: 700;
  font-size: clamp(21px, 3.4vw, 33px);
  line-height: 1.16;
  color: var(--ky-text);
}

.page-faq .faq-group__desc {
  margin: 0;
  max-width: 70ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ky-text-2);
}

.page-faq .faq-group__figure {
  margin: 0 0 20px;
  border: 1px solid var(--ky-line);
  background: var(--ky-ink-800);
  line-height: 0;
}

.page-faq .faq-group__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-group__caption {
  margin: 0;
  padding: 10px 14px;
  border-top: 1px solid var(--ky-line);
  font-family: var(--ky-font-mono);
  font-size: 11.5px;
  line-height: 1.65;
  letter-spacing: 0.03em;
  color: var(--ky-text-2);
}

/* ---------- 问答折叠项 ---------- */
.page-faq .faq-group__items {
  display: grid;
  gap: 10px;
}

.page-faq .faq-item {
  position: relative;
  border: 1px solid var(--ky-line);
  border-left: 3px solid var(--ky-line);
  background: linear-gradient(180deg, var(--ky-ink-800), rgba(11, 18, 32, 0.55));
  transition: border-color 0.2s var(--ky-ease), background 0.2s var(--ky-ease);
}

.page-faq .faq-item:hover,
.page-faq .faq-item:focus-within {
  border-left-color: var(--ky-cyan-dim);
}

.page-faq .faq-item[open] {
  border-left-color: var(--ky-cyan);
  background: linear-gradient(180deg, var(--ky-ink-700), rgba(11, 18, 32, 0.72));
}

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: 34px 1fr 20px;
  align-items: start;
  gap: 10px;
  padding: 15px clamp(13px, 2vw, 22px);
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.5vw, 16.5px);
  font-weight: 600;
  line-height: 1.55;
  color: var(--ky-text);
}

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

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

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

.page-faq .faq-item__no {
  padding-top: 3px;
  font-family: var(--ky-font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--ky-cyan-dim);
  transition: color 0.18s var(--ky-ease);
}

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

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

.page-faq .faq-item__icon {
  position: relative;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  justify-self: end;
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--ky-cyan);
  transition: transform 0.24s var(--ky-ease), opacity 0.24s var(--ky-ease);
}

.page-faq .faq-item__icon::before {
  left: 1px;
  top: 9px;
  width: 18px;
  height: 2px;
}

.page-faq .faq-item__icon::after {
  left: 9px;
  top: 1px;
  width: 2px;
  height: 18px;
}

.page-faq .faq-item[open] .faq-item__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-item__a {
  margin: 0 clamp(13px, 2vw, 22px) 16px;
  padding: 14px 0 0;
  border-top: 1px dashed var(--ky-line);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ky-text-2);
}

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

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

.page-faq .faq-item__a a {
  color: var(--ky-cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-faq .faq-item__a a:hover,
.page-faq .faq-item__a a:focus-visible {
  color: var(--ky-text);
}

/* ---------- 页尾行动区 ---------- */
.page-faq .faq-tail {
  padding: 0 0 clamp(40px, 6vw, 80px);
}

.page-faq .faq-tail__inner {
  display: grid;
  gap: 20px;
  padding-top: 26px;
  padding-bottom: 26px;
  border-top: 1px solid var(--ky-line);
  border-bottom: 1px solid var(--ky-line);
  background:
    linear-gradient(90deg, rgba(34, 211, 238, 0.09) 0%, rgba(34, 211, 238, 0) 46%);
}

.page-faq .faq-tail__title {
  margin: 0 0 8px;
  font-family: var(--ky-font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.2;
  color: var(--ky-text);
}

.page-faq .faq-tail__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ky-text-2);
}

.page-faq .faq-tail__mail {
  font-family: var(--ky-font-mono);
  color: var(--ky-cyan);
  word-break: break-all;
}

.page-faq .faq-tail__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-hero__facts > li + li {
    padding-left: 20px;
    border-left: 1px solid var(--ky-line);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-body__grid {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
  }

  .page-faq .faq-index {
    position: sticky;
    top: 24px;
  }

  .page-faq .faq-tail__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }

  .page-faq .faq-tail__actions {
    flex-wrap: nowrap;
  }
}

@media (max-width: 400px) {
  .page-faq .faq-item__q {
    grid-template-columns: 30px 1fr 18px;
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__no,
  .page-faq .faq-item__icon::before,
  .page-faq .faq-item__icon::after,
  .page-faq .faq-index__link {
    transition: none;
  }
}