.page-faq {
  --faq-numw: 1.8rem;
  --faq-gap: .7rem;
  --faq-pad: .35rem;
  --faq-answer: 30em;
  position: relative;
  padding-bottom: clamp(3rem, 7vw, 6rem);
}

/* ---------- 右缘竖向主题标记 ---------- */
.page-faq .faq-rail {
  display: none;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-intro {
  padding: clamp(1.75rem, 5vw, 3.5rem) 0 clamp(1.4rem, 3vw, 2.4rem);
  border-bottom: 1px solid var(--hair);
}

.page-faq .faq-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--blue);
  padding: .22rem .55rem;
  border: 1px solid var(--blue);
}

.page-faq .faq-intro h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 8vw, 4.2rem);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -.015em;
  margin: 1rem 0 1.1rem;
  max-width: 16em;
  color: var(--ink);
}

.page-faq .faq-intro .lede {
  max-width: 40em;
  font-size: 1.02rem;
  line-height: 1.85;
  color: rgba(14, 17, 20, .8);
}

/* ---------- 主题跳转 ---------- */
.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem .9rem;
  margin-top: clamp(1.4rem, 3vw, 2.2rem);
}

.page-faq .faq-jump-title {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--brick);
}

.page-faq .faq-jump-list {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-jump-list a {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .34rem .72rem;
  border: 1px solid var(--hair);
  border-radius: 999px;
  font-size: .82rem;
  line-height: 1.4;
  color: var(--ink);
  text-decoration: none;
  background: transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-faq .faq-jump-list a .mono {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  color: var(--bronze);
}

.page-faq .faq-jump-list a:hover,
.page-faq .faq-jump-list a:focus-visible {
  color: var(--blue);
  border-color: var(--blue);
  background-color: rgba(19, 88, 255, .07);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  padding-top: clamp(2rem, 4.5vw, 3.2rem);
}

.page-faq .faq-group-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: .3rem .85rem;
  padding: 1rem .9rem 1rem 1rem;
  border-top: 2px solid var(--ink);
  border-left: 3px solid var(--blue);
  background-image: repeating-linear-gradient(
    135deg,
    transparent 0 16px,
    rgba(46, 110, 96, .1) 16px 17px
  );
}

.page-faq .faq-group-num {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  line-height: 1;
  color: var(--blue);
  border: 1px solid var(--blue);
  padding: .22rem .4rem;
}

.page-faq .faq-group-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 5vw, 1.85rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: .005em;
  margin: 0;
  color: var(--ink);
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-list {
  border-top: 1px solid var(--hair);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--hair);
  background: transparent;
}

.page-faq .faq-item > summary {
  display: grid;
  grid-template-columns: var(--faq-numw) minmax(0, 1fr) 1.5rem;
  gap: 0 var(--faq-gap);
  align-items: start;
  padding: 1.3rem var(--faq-pad) 1.3rem var(--faq-pad);
  cursor: pointer;
  list-style: none;
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

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

.page-faq .faq-item > summary::marker {
  content: "";
}

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--bronze);
  padding-top: .5rem;
}

.page-faq .faq-q {
  font-size: clamp(1.02rem, 4.2vw, 1.34rem);
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: -.004em;
  color: var(--ink);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-mark {
  position: relative;
  width: 1.5rem;
  height: 1.5rem;
  margin-top: .18rem;
  justify-self: end;
}

.page-faq .faq-mark::before,
.page-faq .faq-mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--brick);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-mark::before {
  width: 1rem;
  height: 2px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-mark::after {
  width: 2px;
  height: 1rem;
  transform: translate(-50%, -50%);
}

.page-faq .faq-item[open] .faq-mark::before {
  background: var(--blue);
}

.page-faq .faq-item[open] .faq-mark::after {
  transform: translate(-50%, -50%) scaleY(0);
  background: var(--blue);
}

.page-faq .faq-item > summary:hover {
  background-color: rgba(46, 110, 96, .06);
}

.page-faq .faq-item > summary:hover .faq-q,
.page-faq .faq-item[open] > summary .faq-q {
  color: var(--blue);
}

.page-faq .faq-item:target > summary {
  background-color: rgba(19, 88, 255, .07);
  box-shadow: inset 3px 0 0 var(--blue);
}

.page-faq .faq-answer {
  max-width: var(--faq-answer);
  margin-inline-start: 0;
  padding: 0 var(--faq-pad) 2rem var(--faq-pad);
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(14, 17, 20, .82);
}

.page-faq .faq-answer p {
  margin: 0 0 .85rem;
}

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

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: clamp(1.4rem, 3.5vw, 2.2rem) 0 0;
  border: 1px solid var(--hair);
  background: var(--paper);
  box-shadow: var(--shadow-inner);
}

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

.page-faq .faq-figure-cap {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--brick);
  padding: .7rem .9rem;
  border-top: 1px solid var(--hair);
}

/* ---------- 继续问我们 ---------- */
.page-faq .faq-ask {
  padding-top: clamp(1.2rem, 3vw, 2rem);
}

.page-faq .faq-ask > p {
  max-width: 38em;
  margin: 0 0 1.5rem;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(14, 17, 20, .82);
}

.page-faq .faq-ask-list {
  list-style: none;
  margin: 0 0 1.8rem;
  padding: 0;
  border-top: 1px solid var(--hair);
  max-width: 42em;
}

.page-faq .faq-ask-list li {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem .9rem;
  align-items: baseline;
  padding: .75rem 0;
  border-bottom: 1px solid var(--hair);
  font-size: .95rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-faq .faq-ask-key {
  flex: none;
  min-width: 3.2rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  color: var(--bronze);
}

.page-faq .faq-group--ask .faq-group-head {
  background-image: repeating-linear-gradient(
    135deg,
    transparent 0 16px,
    rgba(19, 88, 255, .1) 16px 17px
  );
}

/* ---------- 640px 以上 ---------- */
@media (min-width: 640px) {
  .page-faq {
    --faq-numw: 2.4rem;
    --faq-gap: .85rem;
    --faq-pad: .5rem;
    --faq-answer: 38em;
  }

  .page-faq .faq-answer {
    margin-inline-start: calc(var(--faq-numw) + var(--faq-gap) + var(--faq-pad));
  }

  .page-faq .faq-item > summary {
    padding-top: 1.55rem;
    padding-bottom: 1.55rem;
  }

  .page-faq .faq-q {
    font-size: 1.22rem;
  }

  .page-faq .faq-group-head {
    padding: 1.15rem 1.4rem 1.15rem 1.2rem;
    gap: .3rem 1.1rem;
  }

  .page-faq .faq-figure {
    margin-top: clamp(1.8rem, 3vw, 2.6rem);
  }
}

/* ---------- 1024px 以上 ---------- */
@media (min-width: 1024px) {
  .page-faq {
    --faq-answer: 42em;
  }

  .page-faq .faq-intro {
    padding-top: clamp(3rem, 6vw, 5rem);
  }

  .page-faq .faq-intro h1 {
    max-width: 14em;
  }

  .page-faq .faq-group-head h2 {
    font-size: 1.9rem;
  }

  .page-faq .faq-q {
    font-size: 1.34rem;
  }

  .page-faq .faq-figure {
    max-width: 52em;
  }
}

/* ---------- 1280px 以上：右缘竖向标记 ---------- */
@media (min-width: 1280px) {
  .page-faq .faq-rail {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    position: fixed;
    top: 50%;
    right: 1.1rem;
    transform: translateY(-50%);
    z-index: 1;
    pointer-events: none;
  }

  .page-faq .faq-rail-line {
    width: 1px;
    height: 4.5rem;
    background: linear-gradient(to bottom, transparent, var(--hair) 60%, var(--blue));
  }

  .page-faq .faq-rail-line:last-child {
    background: linear-gradient(to bottom, var(--blue), var(--hair) 40%, transparent);
  }

  .page-faq .faq-rail-label {
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .3em;
    line-height: 1;
    color: var(--brick);
    opacity: .8;
    white-space: nowrap;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item > summary,
  .page-faq .faq-q,
  .page-faq .faq-mark::before,
  .page-faq .faq-mark::after,
  .page-faq .faq-jump-list a {
    transition: none;
  }
}
</main>