.page-faq {
  --fq-hair: 1px solid var(--steel);
  --fq-gap: clamp(16px, 2.2vw, 30px);
  background: var(--ink);
  color: var(--text);
}

.page-faq a {
  color: inherit;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: var(--fq-hair);
  background:
    radial-gradient(120% 90% at 6% 0%, rgba(255, 90, 31, 0.16), transparent 62%),
    linear-gradient(180deg, var(--char), var(--ink) 82%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(47, 54, 70, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(47, 54, 70, 0.38) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 88%);
  mask-image: linear-gradient(180deg, #000, transparent 88%);
  opacity: 0.7;
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--fq-gap);
  align-items: end;
  padding-block: clamp(36px, 6.4vw, 84px) clamp(30px, 5vw, 62px);
}

.page-faq .faq-hero__text {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-faq .faq-hero .crumb {
  margin-bottom: 4px;
}

.page-faq .faq-hero__title {
  margin: 0;
  font-family: var(--sans);
  font-weight: 200;
  font-size: clamp(34px, 6vw, 70px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ice);
  max-width: 15ch;
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.75;
  color: var(--text);
}

.page-faq .faq-hero__note {
  margin: 0;
  padding-top: 14px;
  border-top: var(--fq-hair);
  max-width: 60ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

.page-faq .faq-hero__fig {
  position: relative;
  margin: 0;
  aspect-ratio: 3 / 2;
  border: var(--fq-hair);
  border-left: 3px solid var(--flame);
  background: var(--char);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.45);
}

.page-faq .faq-hero__fig::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 55%, rgba(10, 12, 16, 0.75));
}

.page-faq .faq-hero__fig .figure__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 主体网格 ---------- */

.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 44px);
  padding-block: clamp(28px, 5vw, 70px) clamp(52px, 7vw, 112px);
}

/* ---------- 分类索引轨道 ---------- */

.page-faq .faq-rail {
  position: sticky;
  top: calc(var(--bar-h) + 8px);
  z-index: 4;
  padding-bottom: 6px;
  background: linear-gradient(180deg, var(--ink) 82%, rgba(10, 12, 16, 0));
}

.page-faq .faq-rail__title {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .faq-rail__list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: 9px;
  flex: none;
  padding: 9px 13px;
  border: var(--fq-hair);
  border-left: 2px solid transparent;
  background: rgba(18, 22, 32, 0.82);
  text-decoration: none;
  white-space: nowrap;
  font-size: 13.5px;
  color: var(--text);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .faq-rail__link:hover {
  border-color: var(--flame);
  color: var(--ice);
}

.page-faq .faq-rail__link[aria-current="true"],
.page-faq .faq-rail__link[aria-current="page"] {
  border-left-color: var(--flame);
  background: linear-gradient(90deg, rgba(255, 90, 31, 0.18), rgba(18, 22, 32, 0.82) 72%);
  color: var(--ice);
}

.page-faq .faq-rail__idx {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--flame);
  letter-spacing: 0.04em;
}

.page-faq .faq-rail__hint {
  display: none;
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: var(--fq-hair);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate);
}

.page-faq .faq-rail__hint a {
  color: var(--data);
  text-decoration: none;
  border-bottom: 1px dashed rgba(45, 156, 255, 0.5);
}

/* ---------- 章节与手风琴 ---------- */

.page-faq .faq-panels {
  display: grid;
  gap: clamp(30px, 4.6vw, 60px);
  min-width: 0;
}

.page-faq .faq-sec {
  min-width: 0;
  scroll-margin-top: calc(var(--bar-h) + 84px);
}

.page-faq .faq-sec__head {
  display: grid;
  gap: 10px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--steel);
  margin-bottom: 2px;
}

.page-faq .faq-sec__title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(21px, 2.9vw, 30px);
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--ice);
}

.page-faq .faq-sec__no {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 400;
  color: var(--flame);
  letter-spacing: 0.06em;
}

.page-faq .faq-sec__lead {
  margin: 0;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
}

.page-faq .faq-item {
  border-bottom: var(--fq-hair);
}

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr) 18px;
  align-items: start;
  gap: 12px;
  padding: 17px 0;
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 700;
  line-height: 1.55;
  color: var(--text);
  transition: color 0.2s var(--ease);
}

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

.page-faq .faq-item__q:hover {
  color: var(--flame);
}

.page-faq .faq-item__no {
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--slate);
  padding-top: 5px;
}

.page-faq .faq-item__ico {
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: 5px;
  border: 1px solid var(--steel);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .faq-item__ico::before,
.page-faq .faq-item__ico::after {
  content: "";
  position: absolute;
  background: var(--flame);
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}

.page-faq .faq-item__ico::before {
  left: 50%;
  top: 4px;
  bottom: 4px;
  width: 1px;
  transform: translateX(-50%);
}

.page-faq .faq-item__ico::after {
  top: 50%;
  left: 4px;
  right: 4px;
  height: 1px;
  transform: translateY(-50%);
}

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

.page-faq .faq-item[open] .faq-item__ico {
  border-color: var(--flame);
  background: rgba(255, 90, 31, 0.14);
}

.page-faq .faq-item[open] .faq-item__ico::before {
  opacity: 0;
  transform: translateX(-50%) scaleY(0.2);
}

.page-faq .faq-item__a {
  display: grid;
  gap: 12px;
  padding: 2px 0 24px;
  max-width: 74ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

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

.page-faq .faq-item__a a {
  color: var(--data);
  text-decoration: none;
  border-bottom: 1px dashed rgba(45, 156, 255, 0.5);
}

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

.page-faq .faq-item__more {
  font-size: 12.5px;
  color: var(--slate);
}

.page-faq .faq-steps {
  counter-reset: fqstep;
  list-style: none;
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
}

.page-faq .faq-steps li {
  counter-increment: fqstep;
  position: relative;
  padding-left: 32px;
  font-size: 14.5px;
  line-height: 1.72;
}

.page-faq .faq-steps li::before {
  content: counter(fqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 3px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--flame);
}

.page-faq .faq-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-legend li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.7;
}

/* ---------- 排查流程图 ---------- */

.page-faq .faq-flow {
  margin: 22px 0 6px;
  padding: 18px 16px;
  border: var(--fq-hair);
  background: linear-gradient(180deg, rgba(18, 22, 32, 0.9), rgba(10, 12, 16, 0.9));
  overflow-x: auto;
}

.page-faq .faq-flow svg {
  display: block;
  width: 100%;
  min-width: 660px;
  height: auto;
}

.page-faq .faq-flow__node rect {
  fill: var(--char-2);
  stroke: var(--steel);
  stroke-width: 1;
}

.page-faq .faq-flow__node text {
  fill: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 600;
}

.page-faq .faq-flow__node--hot rect {
  fill: rgba(255, 90, 31, 0.16);
  stroke: var(--flame);
}

.page-faq .faq-flow__node--hot text {
  fill: var(--ice);
}

.page-faq .faq-flow__link {
  stroke: var(--flame);
  stroke-width: 1.4;
}

/* ---------- 章节图片与收尾 ---------- */

.page-faq .faq-fix__fig {
  margin: 24px 0 0;
  aspect-ratio: 10 / 7;
  border: var(--fq-hair);
  background: var(--char);
}

.page-faq .faq-fix__fig .figure__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-faq .faq-cta {
  display: grid;
  gap: 16px;
  margin-top: 26px;
  padding: 22px 20px;
  border: var(--fq-hair);
  border-left: 3px solid var(--flame);
  background: linear-gradient(100deg, rgba(255, 90, 31, 0.12), rgba(18, 22, 32, 0.6) 62%);
}

.page-faq .faq-cta__text {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text);
}

.page-faq .faq-cta__text a {
  color: var(--data);
  text-decoration: none;
  border-bottom: 1px dashed rgba(45, 156, 255, 0.5);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-faq .faq-item__a {
    padding-left: 38px;
  }
}

@media (min-width: 940px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 3.6vw, 56px);
  }

  .page-faq .faq-body {
    grid-template-columns: 264px minmax(0, 1fr);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 28px;
    background: none;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
  }

  .page-faq .faq-rail__link {
    white-space: normal;
    padding: 11px 14px;
    font-size: 13.5px;
  }

  .page-faq .faq-rail__hint {
    display: block;
  }

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

  .page-faq .faq-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 26px 26px;
  }
}

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