.page-faq {
  --faq-index-w: 276px;
  --faq-card-bg: linear-gradient(180deg, rgba(18, 61, 44, .86), rgba(7, 26, 18, .95));
  padding-bottom: clamp(56px, 8vw, 96px);
}

.page-faq .breadcrumb {
  margin: 16px 0 4px;
}

/* ---------- 首屏框景 ---------- */
.page-faq .faq-hero {
  padding: 4px 0 0;
}

.page-faq .faq-hero-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: clamp(22px, 4.5vw, 48px);
  background:
    radial-gradient(130% 100% at 88% -20%, rgba(53, 242, 194, .16), transparent 58%),
    radial-gradient(90% 90% at 0% 112%, rgba(255, 90, 54, .13), transparent 62%),
    linear-gradient(165deg, var(--stand) 0%, var(--night) 62%, var(--shadow) 100%);
}

.page-faq .faq-hero-frame::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 12px;
  right: 12px;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--line-strong) 0 10px, transparent 10px 24px);
  opacity: .75;
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: clamp(24px, 4vw, 42px);
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: clamp(2.05rem, 6.4vw, 4.1rem);
  line-height: 1.05;
  letter-spacing: -.008em;
  color: var(--paper);
  max-width: 21ch;
}

.page-faq .faq-hero .lede {
  margin-top: 16px;
  max-width: 62ch;
  color: var(--grass);
}

.page-faq .faq-hero-actions {
  margin-top: 24px;
}

.page-faq .faq-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 28px 0 0;
  padding-top: 20px;
  border-top: 1px dashed var(--line);
}

.page-faq .faq-hero-stats > div {
  margin: 0;
  min-width: 0;
}

.page-faq .faq-hero-stats dt {
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--grass);
}

.page-faq .faq-hero-stats dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 3.4vw, 1.95rem);
  line-height: 1.1;
  color: var(--neon);
}

.page-faq .faq-hero-media {
  margin: 0;
}

.page-faq .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.page-faq .media-frame figcaption {
  margin-top: 10px;
  font-size: .82rem;
  color: var(--grass);
}

@media (min-width: 940px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: center;
  }
}

/* ---------- 区块节奏 ---------- */
.page-faq .faq-block {
  padding-top: clamp(48px, 7vw, 86px);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

/* ---------- 故障树：分类 + 手风琴 ---------- */
.page-faq .faq-shell {
  display: grid;
  gap: 20px;
}

.page-faq .faq-index {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  padding: 16px;
  background: linear-gradient(180deg, rgba(13, 43, 32, .96), rgba(7, 26, 18, .96));
}

.page-faq .faq-index-title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 1.05rem;
  letter-spacing: .05em;
  color: var(--paper);
}

.page-faq .faq-chips {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-chips .chip {
  flex: 0 0 auto;
  white-space: nowrap;
}

.page-faq .faq-index-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: .84rem;
  line-height: 1.65;
  color: var(--grass);
}

.page-faq .faq-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .accordion-item {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: var(--faq-card-bg);
  overflow: hidden;
  transition: border-color .3s ease;
}

.page-faq .accordion-item:hover {
  border-color: var(--line-strong);
}

.page-faq .accordion-item h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 400;
}

.page-faq .accordion-trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 15px 16px;
  border: 0;
  background: none;
  color: var(--paper);
  text-align: left;
  cursor: pointer;
}

.page-faq .faq-q-num {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 26px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--neon);
}

.page-faq .faq-q-text {
  flex: 1 1 auto;
  min-width: 0;
  font-size: .98rem;
  font-weight: 600;
  line-height: 1.5;
}

.page-faq .accordion-trigger .tag {
  flex: 0 0 auto;
}

.page-faq .accordion-panel {
  display: block;
  padding: 14px 18px 18px;
  border-top: 1px solid var(--line-soft);
  color: var(--grass);
}

.page-faq .accordion-trigger[aria-expanded="false"] + .accordion-panel {
  display: none;
}

.page-faq .faq-actions {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 9px;
  max-width: 70ch;
  font-size: .94rem;
  line-height: 1.75;
}

.page-faq .faq-actions li::marker {
  color: var(--neon);
  font-family: var(--font-mono);
}

.page-faq .faq-empty {
  margin: 16px 0 0;
  padding: 16px 18px;
  border: 1px dashed var(--line);
  border-radius: var(--radius-lg);
  font-size: .92rem;
  color: var(--grass);
}

@media (min-width: 960px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

  .page-faq .faq-chips {
    flex-wrap: wrap;
    overflow: visible;
    padding-bottom: 0;
  }
}

/* ---------- 导出三步 ---------- */
.page-faq .faq-export-grid {
  display: grid;
  gap: 22px;
}

.page-faq .faq-steps {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 16px;
  padding: 18px 20px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: var(--faq-card-bg);
}

.page-faq .faq-step-num {
  grid-row: span 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-pill);
  background: linear-gradient(150deg, var(--score), var(--signal));
  color: var(--shadow);
  font-size: 1.15rem;
  font-weight: 700;
}

.page-faq .faq-step h3 {
  margin: 0;
  align-self: center;
  font-family: var(--font-head);
  font-size: 1.3rem;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-faq .faq-step p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.72;
  color: var(--grass);
  max-width: 62ch;
}

.page-faq .faq-export-media {
  margin: 0;
}

.page-faq .faq-stuck {
  margin-top: 26px;
  padding: 20px 22px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-lg);
  background: rgba(255, 138, 61, .05);
}

.page-faq .faq-stuck h3 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: 1.15rem;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-faq .faq-stuck ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-faq .faq-stuck li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  font-size: .93rem;
  line-height: 1.7;
  color: var(--grass);
}

.page-faq .faq-stuck li span:last-child {
  flex: 1 1 240px;
  min-width: 0;
}

@media (min-width: 900px) {
  .page-faq .faq-export-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }
}

/* ---------- 资料库 ---------- */
.page-faq .faq-lib-grid {
  display: grid;
  gap: 16px;
}

.page-faq .faq-tile {
  padding: 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: var(--faq-card-bg);
}

.page-faq .faq-tile-label {
  margin: 0 0 10px;
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--neon);
}

.page-faq .faq-tile h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 1.25rem;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-faq .faq-tile p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.7;
  color: var(--grass);
}

.page-faq .faq-seasons {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(120deg, rgba(53, 242, 194, .09), transparent 64%);
}

.page-faq .faq-seasons-label {
  margin: 0;
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--grass);
}

.page-faq .faq-season-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-season-list li {
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: .92rem;
  color: var(--neon);
}

.page-faq .faq-seasons-note {
  flex: 1 1 260px;
  margin: 0;
  min-width: 0;
  font-size: .9rem;
  line-height: 1.68;
  color: var(--grass);
}

@media (min-width: 760px) {
  .page-faq .faq-lib-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 联系支持 ---------- */
.page-faq .faq-contact-shell {
  display: grid;
  gap: 20px;
}

.page-faq .faq-contact h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  letter-spacing: .01em;
  color: var(--paper);
}

.page-faq .faq-prep {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: prep;
  display: grid;
  gap: 14px;
}

.page-faq .faq-prep li {
  position: relative;
  padding-left: 46px;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--grass);
  max-width: 64ch;
}

.page-faq .faq-prep li::before {
  counter-increment: prep;
  content: counter(prep);
  position: absolute;
  left: 0;
  top: 3px;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: .84rem;
  color: var(--neon);
}

.page-faq .faq-contact-card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(120% 100% at 100% 0%, rgba(255, 90, 54, .17), transparent 60%),
    linear-gradient(170deg, var(--stand), var(--night));
}

.page-faq .faq-contact-title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: 1.2rem;
  letter-spacing: .05em;
  color: var(--paper);
}

.page-faq .faq-contact-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-faq .faq-contact-list li {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line-soft);
}

.page-faq .faq-contact-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-faq .faq-contact-list .k {
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--grass);
}

.page-faq .faq-contact-list .v {
  font-family: var(--font-mono);
  font-size: .95rem;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .faq-contact-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: .82rem;
  line-height: 1.65;
  color: var(--grass);
}

@media (min-width: 880px) {
  .page-faq .faq-contact-shell {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }
}

/* ---------- 延伸阅读 ---------- */
.page-faq .faq-links {
  margin-top: 22px;
}

.page-faq .faq-link {
  display: block;
  padding: 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: var(--faq-card-bg);
  text-decoration: none;
  transition: border-color .3s ease, transform .3s ease;
}

.page-faq .faq-link:hover,
.page-faq .faq-link:focus-visible {
  border-color: var(--line-strong);
  transform: translateY(-3px);
}

.page-faq .faq-link .card-title {
  margin: 12px 0 8px;
  font-family: var(--font-head);
  font-size: 1.28rem;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-faq .faq-link .card-body {
  margin: 0;
  font-size: .9rem;
  line-height: 1.68;
  color: var(--grass);
}

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

  .page-faq .faq-link:hover,
  .page-faq .faq-link:focus-visible {
    transform: none;
  }
}