.page-faq {
  --faq-rail-w: 252px;
  --faq-gap: clamp(26px, 3.4vw, 58px);
  --faq-line: #232733;
  --faq-body: #C3C6CF;
  display: block;
}

.page-faq [id] {
  scroll-margin-top: 112px;
}

/* ---------- 页首 ---------- */
.page-faq .faq-head {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 3.6vw, 44px) 0 clamp(32px, 4.6vw, 58px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(78% 108% at 8% 0%, rgba(22, 224, 200, 0.11), transparent 60%),
    radial-gradient(72% 96% at 92% 6%, rgba(200, 150, 30, 0.16), transparent 62%),
    var(--ink);
}

.page-faq .faq-head::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.18;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), transparent 78%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), transparent 78%);
  pointer-events: none;
}

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

.page-faq .faq-head__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 20px 0 0;
  padding: 5px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(200, 150, 30, 0.08);
  color: var(--gold-lit);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.page-faq .faq-head__title {
  max-width: 15ch;
  margin: 20px 0 0;
  font-size: clamp(34px, 6vw, 78px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.025em;
  color: var(--bone);
}

.page-faq .faq-head__hl {
  background: linear-gradient(96deg, var(--gold-lit) 0%, var(--gold) 50%, #8d6710 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-faq .faq-lede {
  max-width: 62ch;
  margin: 22px 0 0;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.82;
  color: var(--body, #C3C6CF);
  color: #C3C6CF;
}

.page-faq .faq-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 40px;
  margin: 30px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-faq .faq-facts__item {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-facts__item b {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-facts__item span {
  font-size: 13px;
  color: var(--mist);
}

.page-faq .faq-head__figure {
  margin: clamp(26px, 3.2vw, 40px) 0 0;
}

.page-faq .faq-head__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 260px;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 3px;
}

/* ---------- 主体分栏 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  padding-block: clamp(36px, 5vw, 78px);
}

/* ---------- 主题索引 ---------- */
.page-faq .faq-nav {
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: linear-gradient(180deg, rgba(20, 22, 29, 0.96), rgba(10, 11, 15, 0.96));
}

.page-faq .faq-nav__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-faq .faq-nav__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-nav__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  border-left: 2px solid transparent;
  color: var(--bone);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease), color var(--t) var(--ease);
}

.page-faq .faq-nav__n {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gold);
}

.page-faq .faq-nav__link:hover,
.page-faq .faq-nav__link:focus-visible {
  border-left-color: var(--gold);
  background: rgba(200, 150, 30, 0.08);
  color: var(--gold-lit);
  outline: none;
}

.page-faq .faq-nav__link.is-active {
  border-left-color: var(--gold-lit);
  background: rgba(200, 150, 30, 0.1);
  color: var(--gold-lit);
}

/* ---------- 章节 ---------- */
.page-faq .faq-flow {
  min-width: 0;
}

.page-faq .faq-section {
  padding-block: clamp(30px, 4vw, 54px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-flow > .faq-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .faq-section__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 0 16px;
  margin-bottom: clamp(18px, 2.2vw, 28px);
}

.page-faq .faq-section__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-faq .faq-section__title {
  margin: 0;
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--bone);
}

.page-faq .faq-section__note {
  grid-column: 2;
  max-width: 60ch;
  margin: 9px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 置顶速查 ---------- */
.page-faq .quick {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .quick__link {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 15px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: 3px;
  background: var(--panel);
  text-decoration: none;
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-faq .quick__link:hover,
.page-faq .quick__link:focus-visible {
  border-color: var(--cyan);
  border-left-color: var(--cyan);
  background: #171a22;
  outline: none;
}

.page-faq .quick__body {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.page-faq .quick__q {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--bone);
}

.page-faq .quick__a {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .quick__stat {
  flex: 0 0 auto;
  margin-left: auto;
  display: grid;
  gap: 2px;
  text-align: right;
}

.page-faq .quick__stat b {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-faq .quick__stat i {
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* ---------- 问答折叠 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 10px;
}

.page-faq .faq-item {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--panel);
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--gold-lit), var(--gold));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 220ms var(--ease);
}

.page-faq .faq-item:hover,
.page-faq .faq-item[open] {
  border-color: #3a3f4d;
}

.page-faq .faq-item:hover::before,
.page-faq .faq-item[open]::before {
  transform: scaleY(1);
}

.page-faq .faq-q {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 17px 20px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.15vw, 17px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--bone);
  transition: color var(--t) var(--ease);
}

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

.page-faq .faq-q::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--gold);
}

.page-faq .faq-item[open] .faq-q {
  color: var(--gold-lit);
}

.page-faq .faq-item[open] .faq-q::after {
  content: "−";
  color: var(--cyan);
}

.page-faq .faq-q__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

.page-faq .faq-a {
  padding: 16px 20px 22px;
  border-top: 1px solid var(--line);
  animation: faqOpen 220ms var(--ease);
}

@keyframes faqOpen {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .faq-a__lead {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: #C3C6CF;
}

/* ---------- 步骤条 ---------- */
.page-faq .steps {
  display: grid;
  gap: 12px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .steps__item {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.page-faq .steps__n {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  border: 1px solid var(--gold);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  color: var(--gold);
}

.page-faq .steps__t {
  font-size: 14.5px;
  line-height: 1.78;
  color: #C3C6CF;
}

/* ---------- 放大参数 ---------- */
.page-faq .faq-param {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  margin: 18px 0 0;
  padding: 12px 16px;
  border-left: 2px solid var(--cyan);
  border-radius: 3px;
  background: rgba(22, 224, 200, 0.07);
}

.page-faq .faq-param__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-faq .faq-param__value {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-param__unit {
  font-size: 13px;
  color: var(--mist);
}

.page-faq .faq-param--gold {
  border-left-color: var(--gold);
  background: rgba(200, 150, 30, 0.08);
}

.page-faq .faq-param--gold .faq-param__value {
  color: var(--gold-lit);
}

/* ---------- 设备示意图 ---------- */
.page-faq .faq-device-fig {
  margin: 0 0 22px;
}

.page-faq .faq-device-fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 900px;
  border: 1px solid var(--line);
  border-radius: 3px;
}

/* ---------- 结尾引导 ---------- */
.page-faq .faq-cta {
  padding: clamp(24px, 3.4vw, 42px);
  border: 1px solid var(--line);
  border-radius: 4px;
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(200, 150, 30, 0.16), transparent 58%),
    radial-gradient(90% 120% at 0% 100%, rgba(22, 224, 200, 0.09), transparent 60%),
    var(--panel);
}

.page-faq .faq-cta__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-faq .faq-cta__title {
  max-width: 22ch;
  margin: 14px 0 0;
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.018em;
  color: var(--bone);
}

.page-faq .faq-cta__text {
  max-width: 64ch;
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 999px) {
  .page-faq .faq-nav__list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
    scroll-snap-type: x proximity;
    -webkit-overflow-scrolling: touch;
  }

  .page-faq .faq-nav__item {
    flex: 0 0 auto;
    scroll-snap-align: start;
  }

  .page-faq .faq-nav__link {
    padding: 8px 14px;
    border: 1px solid var(--line);
    border-radius: 999px;
    white-space: nowrap;
  }

  .page-faq .faq-nav__link.is-active {
    border-color: var(--gold);
    background: rgba(200, 150, 30, 0.12);
  }

  .page-faq .faq-head__figure img {
    max-height: 200px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: var(--faq-gap);
    align-items: start;
  }

  .page-faq .faq-nav {
    position: sticky;
    top: 96px;
  }
}

@media (max-width: 560px) {
  .page-faq .faq-section__head {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-faq .faq-section__idx {
    margin-bottom: 7px;
  }

  .page-faq .faq-section__note {
    grid-column: 1;
  }

  .page-faq .quick__link {
    flex-wrap: wrap;
    gap: 12px;
  }

  .page-faq .quick__stat {
    margin-left: 0;
    text-align: left;
  }

  .page-faq .faq-q,
  .page-faq .faq-a {
    padding-inline: 16px;
  }

  .page-faq .faq-head__title {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-a {
    animation: none;
  }

  .page-faq .faq-item::before,
  .page-faq .quick__link,
  .page-faq .faq-nav__link {
    transition: none;
  }
}

.page-faq {
  --body: currentColor;
}