.page-faq {
  --faq-gap: clamp(18px, 2.4vw, 30px);
  --faq-indent: 30px;
  --faq-rail: rgba(47, 212, 200, .75);
  background: var(--abyss);
  color: var(--silver);
  overflow-x: clip;
}

.page-faq .faq-hero {
  border-bottom: 1px solid var(--flow);
}

.page-faq .faq-hero__inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 30px var(--gutter) 26px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: end;
}

.page-faq .faq-hero__lead .crumbs {
  margin-bottom: 20px;
}

.page-faq .faq-hero__lead .index-label {
  display: block;
  margin: 0 0 16px;
  color: var(--surge);
}

.page-faq .faq-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(30px, 6.4vw, 62px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--mist);
  max-width: 20ch;
}

.page-faq .faq-hero__intro {
  margin: 0 0 22px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--silver);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
}

.page-faq .faq-hero__side {
  border-top: 1px solid var(--flow);
  padding-top: 18px;
}

.page-faq .faq-hero__side .index-label {
  display: block;
  margin-bottom: 10px;
  color: var(--surge);
}

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

.page-faq .faq-jump li {
  border-bottom: 1px solid rgba(24, 63, 99, .7);
}

.page-faq .faq-jump a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 2px;
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

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

.page-faq .faq-jump__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--surge);
  flex: none;
}

.page-faq .faq-jump a:hover .faq-jump__idx {
  color: var(--orange);
}

.page-faq .faq-hero__side-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
}

.page-faq .faq-hero__side-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 212, 200, .4);
}

.page-faq .faq-banner {
  margin: 0;
  border-top: 1px solid var(--flow);
}

.page-faq .faq-banner img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 340px;
  object-fit: cover;
  object-position: center 42%;
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
  border-bottom: 1px solid var(--flow);
  scroll-margin-top: calc(var(--header-h) + 14px);
}

.page-faq .faq-group + .faq-group::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan) 0 52px, var(--flow) 52px 100%);
}

.page-faq .faq-group__head {
  position: sticky;
  top: var(--header-h);
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 0 13px;
  background: linear-gradient(180deg, var(--abyss) 0 82%, rgba(7, 26, 43, 0) 100%);
  border-bottom: 1px solid var(--flow);
}

.page-faq .faq-group__head::before {
  content: "";
  flex: none;
  width: 4px;
  height: 20px;
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 50% 100%, 0 70%);
}

.page-faq .faq-group__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .18em;
  color: var(--orange);
  flex: none;
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-size: clamp(18px, 2.6vw, 25px);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--mist);
}

.page-faq .faq-group__body {
  counter-reset: qa;
  padding: 4px 0 40px;
}

/* ---------- 问答折页 ---------- */

.page-faq .qa {
  counter-increment: qa;
  border-bottom: 1px solid rgba(24, 63, 99, .72);
}

.page-faq .qa:last-of-type {
  border-bottom: 0;
}

.page-faq .qa summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 12px;
  padding: 17px 2px;
  cursor: pointer;
  list-style: none;
  color: var(--mist);
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.55;
  transition: color .2s var(--ease);
}

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

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

.page-faq .qa summary:hover,
.page-faq .qa summary:focus-visible {
  color: var(--cyan);
}

.page-faq .qa[open] summary {
  color: var(--orange);
}

.page-faq .qa__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .1em;
  color: var(--surge);
  flex: none;
  transition: color .2s var(--ease);
}

.page-faq .qa__num::before {
  content: counter(qa, decimal-leading-zero);
}

.page-faq .qa[open] .qa__num {
  color: var(--orange);
}

.page-faq .qa__sign {
  position: relative;
  width: 13px;
  height: 13px;
  flex: none;
  align-self: center;
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform .26s var(--ease), opacity .26s var(--ease);
}

.page-faq .qa__sign::before {
  left: 0;
  right: 0;
  top: 5.5px;
  height: 2px;
}

.page-faq .qa__sign::after {
  top: 0;
  bottom: 0;
  left: 5.5px;
  width: 2px;
}

.page-faq .qa[open] .qa__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .qa__a {
  padding: 0 2px 22px var(--faq-indent);
  max-width: 74ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-faq .qa__a p {
  margin: 0 0 12px;
}

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

.page-faq .qa__lead {
  border-left: 2px solid var(--orange);
  padding-left: 12px;
  color: var(--mist);
  font-weight: 500;
}

.page-faq .steps {
  list-style: none;
  counter-reset: step;
  margin: 14px 0 0;
  padding: 0;
}

.page-faq .steps li {
  position: relative;
  counter-increment: step;
  padding-left: 28px;
  margin-bottom: 9px;
  font-size: 14.5px;
  line-height: 1.72;
}

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

.page-faq .steps li::before {
  content: "0" counter(step);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-faq .qa__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 212, 200, .4);
}

.page-faq .qa__a a:hover {
  border-bottom-color: var(--cyan);
}

.page-faq .faq-figure {
  margin: 26px 0 6px;
  border: 1px solid var(--flow);
  background: var(--deep);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-faq .faq-figure .media-frame__caption {
  display: block;
  padding: 12px 14px;
  border-top: 1px solid var(--flow);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  line-height: 1.6;
  color: var(--silver);
}

/* ---------- 联系分组 ---------- */

.page-faq .faq-group--contact {
  border-bottom: 0;
}

.page-faq .faq-contact__lead {
  margin: 8px 0 26px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-faq .faq-contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-faq .contact-card {
  border: 1px solid var(--flow);
  border-left: 3px solid var(--cyan);
  background: var(--deep);
  padding: 16px 16px 18px;
}

.page-faq .contact-card .index-label {
  display: block;
  margin: 0 0 12px;
  color: var(--surge);
}

.page-faq .contact-card .mail-copy {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
  text-align: left;
  background: rgba(7, 26, 43, .72);
  border: 1px solid var(--flow);
  padding: 10px 12px;
  cursor: pointer;
  transition: border-color .2s var(--ease);
}

.page-faq .contact-card .mail-copy:hover,
.page-faq .contact-card .mail-copy:focus-visible {
  border-color: var(--cyan);
}

.page-faq .contact-card .mail-copy-value {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
  word-break: break-all;
}

.page-faq .contact-card .copy-hint {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-faq .contact-card .mail-copy[data-copied] .copy-hint {
  color: var(--orange);
}

.page-faq .contact-card .contact-line {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--silver);
}

.page-faq .contact-key {
  display: inline-block;
  margin-right: 10px;
  padding: 1px 7px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .12em;
  color: var(--abyss);
  background: var(--silver);
}

.page-faq .faq-contact__checklist {
  margin-top: 26px;
  border: 1px solid var(--flow);
  padding: 20px 16px;
  background: rgba(14, 42, 69, .55);
}

.page-faq .faq-contact__checklist h3 {
  margin: 0 0 14px;
  font-size: 16px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-faq .checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-faq .checklist li {
  position: relative;
  padding-left: 34px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--silver);
}

.page-faq .checklist__num {
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-faq .faq-contact__note {
  margin: 24px 0 36px;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
  font-size: 14px;
  line-height: 1.74;
  color: var(--silver);
}

.page-faq .faq-contact__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 212, 200, .4);
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-faq .faq-contact__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-contact__grid > .contact-card:last-child {
    grid-column: 1 / -1;
  }

  .page-faq .checklist {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 26px;
  }
}

@media (min-width: 960px) {
  .page-faq {
    --faq-indent: 74px;
  }

  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
    padding: 60px var(--gutter) 48px;
  }

  .page-faq .faq-hero__side {
    border-top: 0;
    border-left: 1px solid var(--flow);
    padding-top: 0;
    padding-left: 28px;
  }

  .page-faq .faq-banner img {
    max-height: 460px;
  }

  .page-faq .faq-group__head {
    padding: 20px 0 16px;
  }

  .page-faq .qa summary {
    font-size: 17px;
    padding: 20px 2px;
  }

  .page-faq .qa__a {
    font-size: 15.5px;
    padding-bottom: 26px;
  }

  .page-faq .faq-contact__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-contact__grid > .contact-card:last-child {
    grid-column: auto;
  }

  .page-faq .faq-contact__checklist {
    padding: 26px 28px;
  }

  .page-faq .faq-figure {
    margin-top: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa summary,
  .page-faq .qa__num,
  .page-faq .qa__sign::before,
  .page-faq .qa__sign::after,
  .page-faq .faq-jump a,
  .page-faq .contact-card .mail-copy {
    transition: none;
  }
}