.page-faq {
  --faq-line-soft: rgba(140, 149, 157, .16);
  padding-bottom: clamp(56px, 9vw, 120px);
}

.page-faq [id] {
  scroll-margin-top: 92px;
}

.page-faq .crumbs {
  padding-block: 22px 6px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(6px, 2vw, 20px) clamp(36px, 6vw, 72px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -20%;
  right: -18%;
  width: min(72vw, 780px);
  aspect-ratio: 1 / .84;
  background: linear-gradient(140deg, rgba(34, 224, 214, .20), rgba(122, 92, 255, .10) 48%, transparent 74%);
  clip-path: polygon(26% 0, 100% 0, 72% 100%, 0 100%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 34px;
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 7vw, 70px);
  line-height: 1.07;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--silver-100);
  text-wrap: balance;
}

.page-faq .faq-hero__lede {
  margin: 20px 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  letter-spacing: .01em;
  color: rgba(232, 236, 239, .78);
}

.page-faq .faq-hero__index {
  padding: 22px 22px 16px;
  border-radius: 16px;
  border: 1px solid var(--faq-line-soft);
}

.page-faq .faq-hero__index-title {
  margin: 0 0 12px;
  color: var(--volt);
}

.page-faq .faq-index {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 2px;
  font-size: 13.5px;
  line-height: 1.55;
  color: rgba(232, 236, 239, .72);
  text-decoration: none;
  border-bottom: 1px solid var(--faq-line-soft);
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--volt);
  padding-left: 8px;
}

.page-faq .faq-index__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--silver-500);
}

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

.page-faq .faq-index__item:last-child .faq-index__link {
  border-bottom: 0;
}

/* ---------- 章节骨架 ---------- */
.page-faq .faq-chapter {
  display: grid;
  gap: 20px;
  padding-block: clamp(42px, 7vw, 78px);
  border-top: 1px solid var(--faq-line-soft);
}

.page-faq .faq-chapter__rail {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-faq .faq-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1;
  letter-spacing: .04em;
  font-weight: 600;
  color: var(--volt);
}

.page-faq .faq-chapter__band {
  display: block;
  width: 62px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--volt), rgba(34, 224, 214, 0));
}

.page-faq .faq-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.6vw, 36px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: var(--silver-100);
}

.page-faq .faq-chapter__note {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver-500);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  margin-top: 24px;
  border-top: 1px solid var(--faq-line-soft);
}

.page-faq .qa:last-of-type {
  border-bottom: 1px solid var(--faq-line-soft);
}

.page-faq .qa > summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 4px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.65;
  font-weight: 600;
  color: var(--silver-100);
  transition: color .2s var(--ease);
}

.page-faq .qa > summary::-webkit-details-marker {
  display: none;
}

.page-faq .qa > summary:hover,
.page-faq .qa > summary:focus-visible,
.page-faq .qa[open] > summary {
  color: var(--volt);
}

.page-faq .qa__mark {
  position: relative;
  flex: none;
  width: 18px;
  height: 18px;
  margin-top: 3px;
  border: 1px solid var(--steel);
  border-radius: 5px;
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--silver-500);
  transition: transform .22s var(--ease), background-color .2s var(--ease);
}

.page-faq .qa__mark::before {
  width: 8px;
  height: 1.5px;
  transform: translate(-50%, -50%);
}

.page-faq .qa__mark::after {
  width: 1.5px;
  height: 8px;
  transform: translate(-50%, -50%);
}

.page-faq .qa[open] .qa__mark {
  border-color: var(--volt);
  background: rgba(34, 224, 214, .14);
}

.page-faq .qa[open] .qa__mark::before,
.page-faq .qa[open] .qa__mark::after {
  background: var(--volt);
}

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

.page-faq .qa__a {
  padding: 0 4px 26px 32px;
  font-size: 14.8px;
  line-height: 1.9;
  letter-spacing: .01em;
  color: rgba(232, 236, 239, .8);
}

.page-faq .qa__a p {
  margin: 0 0 14px;
}

.page-faq .qa__a p:last-of-type {
  margin-bottom: 8px;
}

.page-faq .qa__a strong {
  color: var(--silver-100);
  font-weight: 600;
}

.page-faq .qa__a a:not(.qa__anchor) {
  color: var(--volt);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 214, .35);
}

.page-faq .qa__a a:not(.qa__anchor):hover,
.page-faq .qa__a a:not(.qa__anchor):focus-visible {
  border-bottom-color: var(--volt);
}

.page-faq .qa__anchor {
  display: inline-block;
  margin-top: 6px;
  padding-bottom: 1px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--silver-500);
  text-decoration: none;
  border-bottom: 1px dashed rgba(140, 149, 157, .35);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-faq .qa__anchor:hover,
.page-faq .qa__anchor:focus-visible {
  color: var(--volt);
  border-bottom-color: var(--volt);
}

.page-faq .kbd {
  display: inline-block;
  padding: 1px 7px;
  font-family: var(--font-mono);
  font-size: .9em;
  letter-spacing: .04em;
  color: var(--volt);
  background: rgba(34, 224, 214, .1);
  border: 1px solid rgba(34, 224, 214, .22);
  border-radius: 5px;
}

/* ---------- 图像与步骤图 ---------- */
.page-faq .faq-figure {
  margin: 24px 0 6px;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--faq-line-soft);
  background: linear-gradient(160deg, rgba(34, 224, 214, .07), rgba(10, 12, 15, .6));
}

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

.page-faq .faq-dimmap {
  display: block;
  width: 100%;
  max-width: 560px;
  height: auto;
  margin: 10px 0 14px;
}

.page-faq .faq-dimmap__box {
  transition: stroke .22s var(--ease), stroke-width .22s var(--ease);
}

.page-faq .faq-dimmap__node:hover .faq-dimmap__box {
  stroke: var(--orange);
  stroke-width: 2.5;
}

/* ---------- 双栏：问答 + 配图 ---------- */
.page-faq .faq-split {
  display: grid;
  gap: 8px;
}

.page-faq .faq-split__aside {
  margin-top: 24px;
}

/* ---------- 底部行动区 ---------- */
.page-faq .faq-cta {
  display: grid;
  gap: 22px;
  margin-top: clamp(40px, 7vw, 72px);
  padding: clamp(24px, 4vw, 40px);
  border-radius: 18px;
  border: 1px solid var(--faq-line-soft);
  background: linear-gradient(120deg, rgba(34, 224, 214, .12), rgba(122, 92, 255, .07) 58%, transparent);
}

.page-faq .faq-cta__text {
  margin: 10px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(232, 236, 239, .8);
}

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

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

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

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.42fr) minmax(300px, .82fr);
    align-items: end;
    gap: clamp(40px, 6vw, 88px);
  }

  .page-faq .faq-chapter {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 68px);
  }

  .page-faq .faq-chapter__rail {
    position: sticky;
    top: 104px;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
  }

  .page-faq .faq-chapter__band {
    width: 3px;
    height: 76px;
    background: linear-gradient(180deg, var(--volt), rgba(34, 224, 214, 0));
  }

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: clamp(28px, 4vw, 52px);
    align-items: start;
  }

  .page-faq .faq-split__aside {
    margin-top: 24px;
    position: sticky;
    top: 104px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-chapter__body {
    max-width: 860px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}