.page-faq {
  --faq-gap: clamp(1.5rem, 4vw, 2.75rem);
  --faq-pad: clamp(1rem, 3vw, 1.75rem);
  --faq-indent: 3.3rem;
  padding-block: clamp(1.5rem, 5vw, 3.5rem) clamp(3rem, 7vw, 5rem);
  color: var(--ink);
  background: linear-gradient(178deg, var(--paper) 0%, var(--paper) 58%, var(--paper-deep) 100%);
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--sand);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 首屏：主题声明 + 三步路径 ---------- */
.page-faq .faq-open {
  display: grid;
  gap: clamp(1.25rem, 3vw, 1.9rem);
  margin-bottom: var(--faq-gap);
}

.page-faq .faq-open__kicker {
  margin: 0;
  color: var(--grape);
}

.page-faq .faq-open__title {
  margin: 0;
  font-size: clamp(2rem, 6.5vw, 4.25rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--lake-deep);
  max-width: 18ch;
}

.page-faq .faq-open__lede {
  margin: 0;
  max-width: 46ch;
  color: var(--ink-soft);
}

.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-faq .faq-step {
  position: relative;
  padding: 1.1rem 1.15rem 1.1rem 4.1rem;
  background: var(--highlight);
  border-radius: var(--r-organic);
  box-shadow: var(--shadow-card);
}

.page-faq .faq-step__num {
  position: absolute;
  left: 1.15rem;
  top: 1.1rem;
  width: 2.3rem;
  height: 2.3rem;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--highlight);
  background: var(--lake-deep);
  border-radius: 50%;
}

.page-faq .faq-step:last-child .faq-step__num {
  background: var(--sand);
  color: var(--ink);
}

.page-faq .faq-step__title {
  margin: 0 0 0.35rem;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--lake-deep);
}

.page-faq .faq-step__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-faq .faq-open__figure {
  margin: 0;
}

.page-faq .faq-open__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  border-radius: var(--r-organic-alt);
}

.page-faq .faq-open__figure .figure__caption {
  font-size: 0.8125rem;
  color: var(--ink-soft);
}

/* ---------- 四组导览 ---------- */
.page-faq .faq-map {
  display: grid;
  gap: clamp(1.25rem, 4vw, 2.25rem);
  padding: clamp(1.35rem, 4vw, 2.5rem);
  background: var(--lake-mist);
  border-radius: var(--r-organic-alt);
  margin-bottom: var(--faq-gap);
}

.page-faq .faq-map__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--lake-deep);
}

.page-faq .faq-map__text {
  margin: 0;
  max-width: 44ch;
  line-height: 1.75;
  color: var(--ink);
}

.page-faq .faq-map__list {
  list-style: none;
  margin: 1.15rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-faq .faq-map__link {
  display: flex;
  gap: 0.7rem;
  align-items: baseline;
  padding: 0.7rem 0.85rem;
  background: var(--highlight);
  border-radius: 14px;
  text-decoration: none;
  color: var(--ink);
  font-size: 0.9375rem;
  transition: background-color 160ms var(--ease), transform 160ms var(--ease);
}

.page-faq .faq-map__link:hover {
  background: var(--grape-mist);
  transform: translateY(-2px);
}

.page-faq .faq-map__code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--grape);
  flex: none;
}

.page-faq .faq-map__figure {
  margin: 0;
  max-width: 21rem;
  justify-self: start;
}

.page-faq .faq-map__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--r-organic);
}

/* ---------- 正文与侧边索引 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: var(--faq-gap);
  align-items: start;
}

.page-faq .faq-main {
  display: grid;
  gap: clamp(1.25rem, 3.5vw, 2rem);
  min-width: 0;
}

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

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  background: var(--highlight);
  border-radius: var(--r-organic);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  scroll-margin-top: 1.5rem;
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.85rem;
  padding: 1.05rem var(--faq-pad);
  background: var(--grape-mist);
}

.page-faq .faq-group__code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--highlight);
  background: var(--grape);
  border-radius: var(--r-pill);
  padding: 0.25rem 0.65rem;
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: 1.1875rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--lake-deep);
}

.page-faq .faq-group__note {
  margin: 0 0 0 auto;
  font-size: 0.8125rem;
  color: var(--grape);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  border-top: 1px solid var(--paper-deep);
}

.page-faq .faq-item:first-of-type {
  border-top: 0;
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  padding: 1rem var(--faq-pad);
  cursor: pointer;
  list-style: none;
  border-left: 3px solid transparent;
  transition: background-color 160ms var(--ease), border-color 160ms var(--ease);
}

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

.page-faq .faq-item__q:hover {
  background: var(--lake-mist);
}

.page-faq .faq-item[open] > .faq-item__q {
  border-left-color: var(--sand);
  background: var(--paper);
}

.page-faq .faq-item__num {
  flex: none;
  width: 2.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--grape);
  padding-top: 0.22rem;
}

.page-faq .faq-item__text {
  font-size: 1.0313rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
  min-width: 0;
}

.page-faq .faq-item__mark {
  position: relative;
  flex: none;
  margin-left: auto;
  width: 1.4rem;
  height: 1.4rem;
  color: var(--lake);
  margin-top: 0.2rem;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: currentColor;
  transform: translate(-50%, -50%);
  transition: transform 200ms var(--ease), opacity 200ms var(--ease);
}

.page-faq .faq-item__mark::before {
  width: 0.85rem;
  height: 2px;
}

.page-faq .faq-item__mark::after {
  width: 2px;
  height: 0.85rem;
}

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

.page-faq .faq-item__a {
  padding-block: 0 1.2rem;
  padding-inline: calc(var(--faq-pad) + var(--faq-indent)) var(--faq-pad);
}

.page-faq .faq-item__a p {
  margin: 0 0 0.6rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

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

.page-faq .faq-item__a a:hover {
  color: var(--grape);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-closing {
  margin-top: var(--faq-gap);
  padding: clamp(1.5rem, 5vw, 3rem);
  background: var(--lake-deep);
  border-radius: var(--r-organic);
  color: var(--paper);
}

.page-faq .faq-closing__kicker {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--sand);
}

.page-faq .faq-closing__title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.4rem, 3.4vw, 2.1rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--highlight);
}

.page-faq .faq-closing__text {
  margin: 0 0 1.5rem;
  max-width: 48ch;
  line-height: 1.8;
  color: var(--lake-mist);
}

.page-faq .faq-closing__cta {
  display: inline-flex;
}

/* ---------- 平板及桌面 ---------- */
@media (min-width: 40rem) {
  .page-faq .faq-map__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 48rem) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-faq .faq-step {
    padding: 3.6rem 1.25rem 1.25rem;
  }

  .page-faq .faq-step__num {
    left: 1.25rem;
    top: 1.15rem;
  }

  .page-faq .faq-step::after {
    content: "";
    position: absolute;
    top: 2.3rem;
    right: -1.25rem;
    width: 1.25rem;
    height: 2px;
    background: var(--sand);
  }

  .page-faq .faq-step:last-child::after {
    display: none;
  }
}

@media (min-width: 56rem) {
  .page-faq .faq-map {
    grid-template-columns: minmax(0, 1fr) 18rem;
    align-items: center;
  }

  .page-faq .faq-open__figure {
    margin-top: 0.5rem;
  }
}

@media (min-width: 62rem) {
  .page-faq .faq-body {
    grid-template-columns: minmax(0, 1fr) 15rem;
    gap: clamp(1.75rem, 4vw, 3rem);
  }

  .page-faq .faq-rail {
    display: block;
    position: sticky;
    top: 2rem;
    padding: 1.1rem;
    background: var(--highlight);
    border-radius: var(--r-organic-alt);
    box-shadow: var(--shadow-card);
  }

  .page-faq .faq-rail__title {
    margin: 0 0 0.85rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    color: var(--grape);
  }

  .page-faq .faq-rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.4rem;
  }

  .page-faq .faq-rail__link {
    display: flex;
    gap: 0.55rem;
    align-items: baseline;
    padding: 0.55rem 0.7rem;
    border-radius: 12px;
    background: var(--lake-mist);
    color: var(--lake-deep);
    font-size: 0.875rem;
    text-decoration: none;
    transition: background-color 160ms var(--ease), color 160ms var(--ease);
  }

  .page-faq .faq-rail__link:hover {
    background: var(--grape-mist);
    color: var(--grape);
  }

  .page-faq .faq-rail__code {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    flex: none;
  }

  .page-faq .faq-rail__meta {
    margin: 0.85rem 0 0;
    padding-top: 0.75rem;
    border-top: 1px solid var(--paper-deep);
    font-size: 0.75rem;
    color: var(--ink-soft);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq * {
    transition: none !important;
  }
}