.page-faq {
  --faq-rail-w: 14rem;
  --faq-gap: clamp(1.25rem, 3vw, 2.75rem);
  --faq-anchor-offset: 7.5rem;
  background: var(--pitch-900);
  color: var(--chalk-50);
  padding-bottom: clamp(1.5rem, 5vw, 3rem);
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumb-wrap {
  padding-top: clamp(1rem, 3vw, 1.6rem);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.6rem, 4vw, 2.8rem) 0 clamp(1.8rem, 4.5vw, 3rem);
  background:
    linear-gradient(150deg, rgba(47, 243, 208, 0.1), transparent 55%),
    var(--pitch-950);
  border-bottom: var(--stroke) solid var(--line);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  top: 6%;
  width: 58%;
  height: 130%;
  background: linear-gradient(115deg, rgba(255, 138, 61, 0.14), rgba(47, 243, 208, 0.06));
  transform: skewY(var(--skew));
  pointer-events: none;
}

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

.page-faq .faq-hero__grid {
  display: grid;
  gap: var(--faq-gap);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.4vw, 3.25rem);
  line-height: 1.16;
  letter-spacing: -0.03em;
  margin: 0.55rem 0 1rem;
  max-width: 22ch;
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--mist-300);
}

/* 快速数字 */
.page-faq .faq-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: var(--stroke) solid var(--line);
  box-shadow: var(--hard-shadow-sm);
}

.page-faq .faq-facts__cell {
  background: var(--pitch-800);
  padding: 0.85rem 0.95rem;
}

.page-faq .faq-facts__num {
  display: block;
  margin: 0.3rem 0 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.65rem;
  line-height: 1.1;
  color: var(--yellow-300);
}

.page-faq .faq-facts__label {
  display: block;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--mist-300);
}

/* ---------- 分类索引 ---------- */
.page-faq .faq-index-wrap {
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
}

.page-faq .faq-index__hint {
  margin: 0 0 0.7rem;
  color: var(--mist-300);
}

.page-faq .faq-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
}

.page-faq .faq-index__item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.6rem 0.7rem;
  border: var(--stroke) solid var(--line);
  background: rgba(13, 58, 46, 0.62);
  color: var(--chalk-50);
  text-decoration: none;
  font-size: 0.9rem;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-faq .faq-index__item:hover,
.page-faq .faq-index__item:focus-visible {
  border-color: var(--cyan-400);
  box-shadow: var(--hard-shadow-sm);
  outline: none;
}

.page-faq .faq-index__hex {
  flex: 0 0 auto;
  width: 38px;
  height: 42px;
  display: grid;
  place-items: center;
  clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
  background: var(--pitch-700);
  color: var(--cyan-400);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .faq-index__item:hover .faq-index__hex,
.page-faq .faq-index__item:focus-visible .faq-index__hex {
  background: var(--cyan-400);
  color: var(--pitch-950);
}

/* ---------- 正文骨架 ---------- */
.page-faq .faq-body {
  padding-top: clamp(2rem, 5vw, 3.2rem);
}

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

/* ---------- 索引轨道 ---------- */
.page-faq .faq-rail {
  margin-bottom: clamp(1.75rem, 4vw, 2.5rem);
}

.page-faq .faq-rail__title {
  margin: 0;
  color: var(--mist-300);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0.7rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-faq .faq-rail__item {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line);
  background: var(--pitch-800);
  color: var(--mist-300);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-rail__item:hover,
.page-faq .faq-rail__item:focus-visible {
  color: var(--chalk-50);
  border-color: var(--cyan-400);
  outline: none;
}

.page-faq .faq-rail__n {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--cyan-400);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: var(--faq-anchor-offset);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(2.25rem, 5vw, 3.75rem);
}

.page-faq .faq-group__head {
  border-top: var(--stroke) solid var(--line);
  padding-top: 1rem;
  margin-bottom: clamp(1.1rem, 2.5vw, 1.6rem);
}

.page-faq .faq-group__head .label {
  color: var(--cyan-400);
}

.page-faq .faq-group__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.3rem, 3vw, 1.85rem);
  line-height: 1.28;
  letter-spacing: -0.02em;
  margin: 0.4rem 0 0.55rem;
}

.page-faq .faq-group__lead {
  margin: 0;
  max-width: 64ch;
  color: var(--mist-300);
  line-height: 1.78;
  font-size: 0.9375rem;
}

/* ---------- 问答条目 ---------- */
.page-faq .qa {
  background: var(--pitch-800);
  border: var(--stroke) solid var(--line);
  border-left: 4px solid var(--cyan-400);
  box-shadow: var(--hard-shadow-sm);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-faq .qa + .qa {
  margin-top: 0.85rem;
}

.page-faq .qa[open] {
  border-left-color: var(--amber-500);
  box-shadow: var(--hard-shadow);
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.9rem 1rem;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.6;
  color: var(--chalk-50);
}

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

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

.page-faq .qa__q:hover {
  color: var(--cyan-400);
}

.page-faq .qa__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--cyan-400);
  padding-top: 0.28em;
}

.page-faq .qa__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .qa__mark {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  align-self: center;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  background: var(--cyan-400);
  transform: translateY(-50%);
  transition: transform 0.22s var(--ease), background 0.22s var(--ease);
}

.page-faq .qa__mark::after {
  transform: translateY(-50%) rotate(90deg);
}

.page-faq .qa[open] .qa__mark::before {
  background: var(--amber-500);
}

.page-faq .qa[open] .qa__mark::after {
  transform: translateY(-50%) rotate(0deg);
  background: var(--amber-500);
}

.page-faq .qa__a {
  padding: 0.9rem 1rem 1.15rem;
  border-top: 1px dashed var(--line);
}

.page-faq .qa__a p {
  margin: 0 0 0.8rem;
  color: var(--mist-300);
  font-size: 0.9375rem;
  line-height: 1.8;
}

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

.page-faq .qa__a a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .qa__a a:hover {
  color: var(--amber-500);
}

/* ---------- 步骤条 ---------- */
.page-faq .steps {
  list-style: none;
  margin: 0 0 0.9rem;
  padding: 0;
  counter-reset: faqstep;
  display: grid;
  gap: 0.55rem;
  border-left: 2px dashed var(--line);
  padding-left: 0.9rem;
}

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

.page-faq .steps__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.6rem;
  align-items: start;
  color: var(--chalk-50);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.page-faq .steps__item::before {
  counter-increment: faqstep;
  content: "--" counter(faqstep, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--amber-500);
  padding-top: 0.5em;
  white-space: nowrap;
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(1.1rem, 2.5vw, 1.6rem);
  border: var(--stroke) solid var(--line);
  background: var(--pitch-950);
  box-shadow: var(--hard-shadow);
}

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

.page-faq .faq-figure figcaption {
  padding: 0.6rem 0.85rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--mist-300);
}

/* ---------- 页尾引导 ---------- */
.page-faq .faq-cta {
  margin-top: clamp(2.5rem, 6vw, 4rem);
  background:
    linear-gradient(120deg, rgba(47, 243, 208, 0.08), transparent 60%),
    var(--pitch-950);
  border-top: var(--stroke) solid var(--line);
  box-shadow: inset 0 0 0 2px rgba(34, 107, 87, 0.35);
}

.page-faq .faq-cta__inner {
  display: grid;
  gap: 1.1rem;
  padding: clamp(1.6rem, 4vw, 2.6rem) 0;
}

.page-faq .faq-cta__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.25rem, 3vw, 1.7rem);
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

.page-faq .faq-cta__text {
  margin: 0;
  max-width: 54ch;
  color: var(--mist-300);
  line-height: 1.78;
  font-size: 0.9375rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-index {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(1.5rem, 4vw, 3.5rem);
  }

  .page-faq .faq-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    display: grid;
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(1.5rem, 3.5vw, 3rem);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-anchor-offset);
    margin-bottom: 0;
    border-right: var(--stroke) solid var(--line);
    padding-right: 1.1rem;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    margin-top: 0.9rem;
  }

  .page-faq .faq-rail__item {
    border: 0;
    background: transparent;
    border-left: 2px solid var(--line);
    padding: 0.5rem 0 0.5rem 0.85rem;
    font-size: 0.875rem;
  }

  .page-faq .faq-rail__item:hover,
  .page-faq .faq-rail__item:focus-visible {
    border-left-color: var(--cyan-400);
    background: linear-gradient(90deg, rgba(47, 243, 208, 0.09), transparent);
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-index {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (max-width: 479px) {
  .page-faq .qa__q {
    gap: 0.55rem;
    padding: 0.85rem 0.8rem;
    font-size: 0.9375rem;
  }

  .page-faq .qa__a {
    padding: 0.8rem 0.8rem 1rem;
  }

  .page-faq .steps {
    padding-left: 0.65rem;
  }

  .page-faq .faq-index__item {
    gap: 0.5rem;
    font-size: 0.85rem;
  }

  .page-faq .faq-index__hex {
    width: 32px;
    height: 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after,
  .page-faq .faq-index__item,
  .page-faq .faq-index__hex,
  .page-faq .faq-rail__item {
    transition: none;
  }
}