.page-faq {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  padding: 0 0 72px;
}

.page-faq *,
.page-faq *::before,
.page-faq *::after {
  box-sizing: border-box;
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
}

.page-faq .breadcrumb__item {
  color: var(--mute);
  text-decoration: none;
  transition: color var(--dur-1) var(--ease);
}

.page-faq a.breadcrumb__item:hover {
  color: var(--cyan);
}

.page-faq .breadcrumb__sep {
  color: var(--line);
}

/* ---------- 页头 ---------- */
.page-faq .faq-head {
  position: relative;
  overflow: hidden;
  padding: 34px 0 30px;
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-head::after {
  content: "";
  position: absolute;
  top: -60px;
  right: -70px;
  width: 230px;
  height: 230px;
  background-image: repeating-linear-gradient(-4deg, rgba(23, 230, 200, .18) 0 2px, transparent 2px 15px);
  transform: rotate(-4deg);
  pointer-events: none;
}

.page-faq .faq-head > * {
  position: relative;
  z-index: 1;
}

.page-faq .faq-head__title {
  margin: 12px 0 16px;
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(34px, 8.4vw, 74px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 16ch;
}

.page-faq .faq-head__lede {
  max-width: 62ch;
  color: var(--mute);
  font-size: 15px;
  line-height: 1.85;
  margin: 0;
}

.page-faq .faq-facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-faq .faq-facts__item {
  background: var(--ink-2);
  padding: 12px 14px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--mute);
  letter-spacing: .02em;
}

.page-faq .faq-facts__num {
  display: block;
  font-size: 26px;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  padding: 4px 0 0;
}

.page-faq .stage-nav {
  padding: 0;
}

.page-faq .stage-rail {
  list-style: none;
  margin: 0;
  padding: 14px 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  border-bottom: 2px solid var(--line);
  scrollbar-width: thin;
}

.page-faq .stage-rail__item {
  flex: 0 0 auto;
}

.page-faq .stage-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  color: var(--mute);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease), transform var(--dur-1) var(--ease);
}

.page-faq .stage-rail__link .mono {
  color: var(--cyan);
  font-size: 11px;
}

.page-faq .stage-rail__link:hover,
.page-faq .stage-rail__link:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-faq .faq-groups {
  padding-top: 34px;
}

/* ---------- 分组 ---------- */
.page-faq .faq-group + .faq-group {
  margin-top: 56px;
  padding-top: 48px;
  border-top: 2px solid var(--line);
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding-bottom: 14px;
  margin-bottom: 22px;
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-group__num {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan);
  border: 2px solid var(--cyan);
  padding: 1px 7px;
  line-height: 1.5;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(24px, 5vw, 34px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-group__intro {
  flex: 1 1 100%;
  margin: 0;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-item {
  border: 2px solid var(--line);
  background: var(--ink-2);
  box-shadow: var(--shadow-soft);
  transition: transform var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
}

.page-faq .faq-item + .faq-item {
  margin-top: 12px;
}

.page-faq .faq-item:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-item[open] {
  border-color: var(--cyan);
  background: var(--ink-3);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
}

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

.page-faq .faq-item__mark {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mute);
}

.page-faq .faq-item__text {
  flex: 1 1 auto;
}

.page-faq .faq-item__q::after {
  content: "+";
  flex: 0 0 auto;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
  transition: transform var(--dur-2) var(--ease);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "\2212";
}

.page-faq .faq-item__a {
  margin: 0 16px 18px 22px;
  padding: 2px 0 2px 16px;
  border-left: 3px solid var(--cyan);
  color: var(--mute);
  font-size: 15px;
  line-height: 1.8;
}

.page-faq .faq-item__concl {
  display: inline-block;
  margin: 0 0 10px;
  color: var(--paper);
  font-weight: 600;
  border-bottom: 2px solid var(--cyan);
  padding-bottom: 1px;
}

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

.page-faq .faq-steps li {
  counter-increment: faqstep;
  position: relative;
  padding-left: 30px;
  margin-bottom: 8px;
}

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

.page-faq .faq-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-faq .text-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-faq .text-link:hover {
  color: var(--paper);
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: 26px 0 0;
  max-width: 280px;
  padding: 10px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  box-shadow: var(--shadow-soft);
}

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

.page-faq .faq-figure figcaption {
  padding-top: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .05em;
  line-height: 1.7;
  color: var(--mute);
}

.page-faq .faq-figure--wide {
  max-width: 100%;
  margin-top: 0;
}

/* ---------- 人工通道面板 ---------- */
.page-faq .faq-help__panel {
  margin-top: 30px;
  padding: 24px 20px;
  border: 2px solid var(--cyan);
  background: var(--ink-2);
  box-shadow: var(--shadow-hard);
  display: grid;
  gap: 24px;
}

.page-faq .faq-help__line {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .05em;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .faq-help__note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mute);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-faq .faq-help__actions .btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 900px) {
  .page-faq {
    padding-bottom: 96px;
  }

  .page-faq .faq-head {
    padding: 52px 0 40px;
  }

  .page-faq .faq-head::after {
    width: 320px;
    height: 320px;
    top: -90px;
    right: -110px;
  }

  .page-faq .faq-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    max-width: 900px;
  }

  .page-faq .faq-body {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 56px;
    padding-top: 40px;
  }

  .page-faq .stage-nav {
    position: relative;
  }

  .page-faq .stage-rail {
    position: sticky;
    top: 32px;
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    border-bottom: 0;
    border-left: 2px solid var(--line);
    padding: 6px 0;
  }

  .page-faq .stage-rail__item {
    flex: 0 1 auto;
  }

  .page-faq .stage-rail__link {
    width: 100%;
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -2px;
    background: transparent;
    padding: 10px 12px 10px 16px;
    font-size: 14px;
    white-space: normal;
  }

  .page-faq .stage-rail__link:hover,
  .page-faq .stage-rail__link:focus-visible {
    transform: none;
    border-left-color: var(--cyan);
  }

  .page-faq .faq-groups {
    padding-top: 0;
  }

  .page-faq .faq-item__q {
    padding: 18px 20px;
    font-size: 16.5px;
  }

  .page-faq .faq-item__a {
    margin: 0 22px 22px 26px;
    padding-left: 20px;
  }

  .page-faq .faq-figure {
    max-width: 300px;
  }

  .page-faq .faq-help__panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
    align-items: start;
    gap: 40px;
    padding: 32px 30px;
  }

  .page-faq .faq-figure--wide {
    max-width: 100%;
  }
}

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

  .page-faq .faq-item:hover {
    transform: none;
  }
}