.page-faq {
  --faq-hair: var(--steel);
  --faq-gap: clamp(18px, 3vw, 32px);
  background: var(--abyss);
  color: var(--paper);
  overflow-x: clip;
}

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

.page-faq .prose {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.02em;
  max-width: 62ch;
}

.page-faq .faq-h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  line-height: 1.18;
  letter-spacing: -0.005em;
  color: var(--paper);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding-block: clamp(96px, 15vw, 170px) clamp(28px, 5vw, 56px);
  background:
    radial-gradient(120% 90% at 88% -12%, rgba(43, 28, 99, 0.9), transparent 62%),
    radial-gradient(90% 70% at 4% 112%, rgba(14, 85, 96, 0.6), transparent 64%),
    var(--deep);
  border-bottom: 3px solid var(--steel);
}

.page-faq .faq-hero__title {
  margin: 16px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 3.9rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 20ch;
}

.page-faq .faq-hero__lead {
  color: var(--mist);
  max-width: 56ch;
}

.page-faq .faq-scale {
  position: relative;
  height: 46px;
  margin-top: clamp(26px, 5vw, 52px);
  border-bottom: 3px solid var(--steel);
  background-image: repeating-linear-gradient(90deg, var(--steel) 0 3px, transparent 3px 26px);
  background-repeat: no-repeat;
  background-position: bottom left;
  background-size: 100% 44%;
  overflow: hidden;
}

.page-faq .faq-scale::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 36%;
  height: 44%;
  background: linear-gradient(180deg, rgba(47, 243, 208, 0), rgba(47, 243, 208, 0.42));
  border-bottom: 3px solid var(--cyan);
}

.page-faq .faq-scale::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 3px;
  height: 100%;
  background: var(--lava);
}

/* ---------- 三步自检 ---------- */

.page-faq .faq-steps {
  background: var(--abyss);
}

.page-faq .faq-steps__grid {
  align-items: start;
}

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

.page-faq .faq-checklist__item {
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 14px;
  padding: clamp(18px, 2.8vw, 26px) 0;
  border-top: 3px solid var(--steel);
}

.page-faq .faq-checklist__item:last-child {
  border-bottom: 3px solid var(--steel);
}

.page-faq .faq-checklist__no {
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  padding-top: 5px;
}

.page-faq .faq-checklist__item h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-faq .faq-checklist__item p {
  margin: 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-faq .faq-steps__figure {
  margin: clamp(30px, 5vw, 60px) 0 0;
}

/* ---------- 分类索引 ---------- */

.page-faq .faq-issues {
  background:
    radial-gradient(100% 70% at 0% 0%, rgba(18, 41, 90, 0.7), transparent 58%),
    var(--deep);
  border-top: 3px solid var(--steel);
  border-bottom: 3px solid var(--steel);
}

.page-faq .faq-issues__head {
  max-width: 60ch;
}

.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(22px, 3vw, 34px) 0 clamp(22px, 3vw, 34px);
  padding-bottom: clamp(16px, 2.4vw, 26px);
  border-bottom: 3px solid var(--steel);
}

.page-faq .faq-filter .filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 3px solid var(--steel);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.page-faq .faq-filter .filter-btn:hover {
  border-color: var(--cyan);
  color: var(--paper);
}

.page-faq .faq-filter .filter-btn.is-active {
  border-color: var(--cyan);
  background: rgba(47, 243, 208, 0.12);
  color: var(--paper);
}

.page-faq .faq-filter .filter-count {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mint);
}

.page-faq .faq-list {
  display: grid;
  gap: 12px;
}

.page-faq .faq-item {
  border: 3px solid var(--steel);
  background: var(--abyss);
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-faq .faq-item[open] {
  background: var(--deep);
  border-color: var(--cyan);
  box-shadow: var(--hard);
}

.page-faq .faq-item summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 16px;
  align-items: start;
  padding: clamp(16px, 2.4vw, 22px) clamp(16px, 2.4vw, 26px);
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item summary:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: -3px;
}

.page-faq .faq-item__no {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--mist);
  padding-top: 5px;
  transition: color 0.25s ease;
}

.page-faq .faq-item[open] .faq-item__no {
  color: var(--cyan);
}

.page-faq .faq-item__q {
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  font-weight: 700;
  line-height: 1.55;
  color: var(--paper);
}

.page-faq .faq-item__marker {
  align-self: start;
  width: 10px;
  height: 10px;
  margin-top: 8px;
  border-right: 3px solid var(--mist);
  border-bottom: 3px solid var(--mist);
  transform: rotate(45deg);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-faq .faq-item[open] .faq-item__marker {
  transform: rotate(-135deg);
  border-color: var(--cyan);
}

.page-faq .faq-item__body {
  margin-left: clamp(26px, 5vw, 48px);
  padding: clamp(14px, 2vw, 20px) clamp(16px, 2.4vw, 26px) clamp(18px, 2.6vw, 26px);
  border-left: 3px solid var(--steel);
  border-top: 1px dashed rgba(167, 182, 214, 0.35);
  transition: border-color 0.25s ease;
}

.page-faq .faq-item[open] .faq-item__body {
  border-left-color: var(--cyan);
}

.page-faq .faq-item__body p {
  margin: 0 0 10px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.02em;
  color: var(--mist);
}

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

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

/* ---------- 速查清单 ---------- */

.page-faq .faq-diagnose {
  background:
    linear-gradient(180deg, rgba(5, 11, 31, 0.35), rgba(5, 11, 31, 0.68)),
    var(--jade);
}

.page-faq .faq-sheet {
  margin: clamp(20px, 3vw, 34px) 0 0;
  padding: clamp(18px, 3vw, 30px);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 2.1;
  letter-spacing: 0.06em;
  color: var(--mint);
  background: rgba(5, 11, 31, 0.6);
  border: 3px solid var(--steel);
  box-shadow: var(--hard-ink);
  overflow-x: auto;
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}

/* ---------- 人工支持 ---------- */

.page-faq .faq-support {
  background:
    radial-gradient(85% 95% at 94% 6%, rgba(154, 107, 255, 0.3), transparent 60%),
    radial-gradient(70% 80% at -6% 100%, rgba(255, 106, 43, 0.16), transparent 62%),
    var(--indigo);
}

.page-faq .faq-support__grid {
  align-items: start;
}

.page-faq .faq-contact {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  border-top: 3px solid rgba(241, 246, 255, 0.22);
}

.page-faq .faq-contact li {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 3px solid rgba(241, 246, 255, 0.22);
}

.page-faq .faq-contact__k {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mint);
}

.page-faq .faq-contact__v {
  font-size: 1rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .faq-support__note {
  margin-top: 18px;
  color: var(--mist);
}

.page-faq .faq-support .btn {
  margin-top: 10px;
}

.page-faq .faq-support__figure {
  margin: clamp(28px, 4vw, 40px) 0 0;
}

/* ---------- 响应式 ---------- */

@media (max-width: 879px) {
  .page-faq .faq-hero__title {
    max-width: none;
  }

  .page-faq .faq-checklist__item {
    grid-template-columns: 48px 1fr;
    gap: 10px;
  }

  .page-faq .faq-item summary {
    grid-template-columns: auto 1fr auto;
    gap: 12px;
  }

  .page-faq .faq-item__body {
    margin-left: 12px;
  }

  .page-faq .faq-contact li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .page-faq .faq-sheet {
    font-size: 12px;
    line-height: 1.95;
  }

  .page-faq .faq-item[open] {
    box-shadow: 4px 4px 0 var(--steel);
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-item summary {
    padding-inline: 32px;
  }

  .page-faq .faq-item__body {
    padding-right: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__marker,
  .page-faq .faq-item__no,
  .page-faq .faq-item__body {
    transition: none;
  }
}