.page-faq {
  --faq-measure: 66ch;
  --faq-step-gap: clamp(30px, 4.5vw, 56px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 64px) 0 clamp(26px, 4vw, 46px);
  border-bottom: 1px solid var(--line);
}
.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .28;
  pointer-events: none;
}
.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}
.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(30px, 5.2vw, 54px);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--bone);
  max-width: 20ch;
}
.page-faq .faq-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: var(--faq-measure);
  color: var(--stone);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.75;
}
.page-faq .faq-hero__facts {
  list-style: none;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-faq .faq-hero__facts li {
  background: var(--ink-900);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-faq .faq-hero__k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--stone);
}
.page-faq .faq-hero__v {
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.6vw, 26px);
  line-height: 1.1;
  color: var(--cyan);
}

/* ---------- 布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  padding-block: clamp(32px, 5.5vw, 72px);
  align-items: start;
}
.page-faq .faq-body {
  min-width: 0;
}

/* ---------- 侧边步骤索引 ---------- */
.page-faq .faq-index {
  border-top: 2px solid var(--line);
  padding-top: 14px;
}
.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--stone);
}
.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-faq .faq-index__list li {
  flex: 0 0 auto;
}
.page-faq .faq-index__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: var(--ink-900);
  color: var(--stone);
  font-size: 13.5px;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s ease, background-color .18s ease, border-color .18s ease;
}
.page-faq .faq-index__list a span {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--cyan);
}
.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  color: var(--bone);
  background: var(--ink-800);
  border-color: var(--cyan);
  outline: 2px solid var(--cyan);
  outline-offset: 1px;
}

/* ---------- 步骤块 ---------- */
.page-faq .faq-step {
  position: relative;
  margin-top: var(--faq-step-gap);
  padding-top: var(--faq-step-gap);
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--strip-h) + 20px);
}
.page-faq .faq-body > .faq-step:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}
.page-faq .faq-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(38px, 6.4vw, 68px);
  line-height: .9;
  letter-spacing: -.03em;
  color: var(--cyan);
  opacity: .32;
}
.page-faq .faq-step__title {
  margin: 6px 0 0;
  font-family: var(--font-head);
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.16;
  color: var(--bone);
  max-width: 24ch;
}
.page-faq .faq-step__lede {
  margin: 14px 0 0;
  max-width: var(--faq-measure);
  color: var(--stone);
  font-size: 15.5px;
  line-height: 1.75;
}
.page-faq .faq-step__lede b {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--amber);
}
.page-faq .faq-step__note {
  margin: 20px 0 0;
  padding: 12px 16px;
  border-left: 3px solid var(--line);
  color: var(--stone);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 编号步骤列表 ---------- */
.page-faq .faq-list {
  list-style: none;
  counter-reset: faqstep;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
}
.page-faq .faq-list > li {
  counter-increment: faqstep;
  position: relative;
  padding: 20px 0 20px 56px;
  border-top: 1px solid var(--line-soft);
}
.page-faq .faq-list > li:first-child {
  border-top: 0;
  padding-top: 2px;
}
.page-faq .faq-list > li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 22px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--amber);
}
.page-faq .faq-list > li:first-child::before {
  top: 4px;
}
.page-faq .faq-list h3 {
  margin: 0 0 7px;
  font-family: var(--font-head);
  font-size: 18.5px;
  line-height: 1.3;
  color: var(--bone);
}
.page-faq .faq-list p {
  margin: 0;
  max-width: var(--faq-measure);
  color: var(--stone);
  font-size: 15px;
  line-height: 1.75;
}
.page-faq .faq-list a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 206, .45);
}
.page-faq .faq-list a:hover,
.page-faq .faq-list a:focus-visible {
  border-bottom-color: var(--cyan);
  outline: none;
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: clamp(24px, 3.6vw, 38px) 0 0;
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--line);
  background: var(--moss);
}
.page-faq .faq-figure figcaption {
  margin-top: 10px;
  color: var(--stone);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
  letter-spacing: .01em;
}

/* ---------- 版本对照 ---------- */
.page-faq .faq-compare {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: clamp(24px, 3.6vw, 36px);
}
.page-faq .faq-compare__item {
  padding-top: 18px;
  border-top: 3px solid var(--line);
}
.page-faq .faq-compare__item:nth-child(1) {
  border-top-color: var(--cyan);
}
.page-faq .faq-compare__item:nth-child(2) {
  border-top-color: var(--amber);
}
.page-faq .faq-compare__item h3 {
  margin: 12px 0 8px;
  font-family: var(--font-head);
  font-size: 19px;
  line-height: 1.3;
  color: var(--bone);
}
.page-faq .faq-compare__item p {
  margin: 0;
  color: var(--stone);
  font-size: 15px;
  line-height: 1.75;
}
.page-faq .faq-compare__item .tag {
  display: inline-block;
}

/* ---------- 数据铭牌行 ---------- */
.page-faq .faq-plate-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 34px);
}
.page-faq .faq-plate-row .plate__value {
  font-size: 17px;
}

/* ---------- 时间线 ---------- */
.page-faq .faq-timeline {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0 0 0 20px;
  border-left: 2px solid var(--line);
}
.page-faq .faq-timeline li {
  position: relative;
  padding-bottom: 24px;
}
.page-faq .faq-timeline li:last-child {
  padding-bottom: 0;
}
.page-faq .faq-timeline li::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 5px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--cyan);
  background: var(--ink-950);
}
.page-faq .faq-timeline__k {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--amber);
}
.page-faq .faq-timeline p {
  margin: 0;
  max-width: var(--faq-measure);
  color: var(--stone);
  font-size: 15px;
  line-height: 1.75;
}
.page-faq .faq-timeline a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 206, .45);
}
.page-faq .faq-timeline a:hover,
.page-faq .faq-timeline a:focus-visible {
  border-bottom-color: var(--cyan);
  outline: none;
}

/* ---------- 排查顺序 ---------- */
.page-faq .faq-order {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
}
.page-faq .faq-order li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
}
.page-faq .faq-order li:first-child {
  border-top: 0;
  padding-top: 2px;
}
.page-faq .faq-order__n {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.15;
  color: var(--amber);
}
.page-faq .faq-order h3 {
  margin: 0 0 7px;
  font-family: var(--font-head);
  font-size: 18.5px;
  line-height: 1.3;
  color: var(--bone);
}
.page-faq .faq-order p {
  margin: 0;
  max-width: var(--faq-measure);
  color: var(--stone);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 联系支持 ---------- */
.page-faq .faq-need {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-faq .faq-need li {
  position: relative;
  padding-left: 24px;
  color: var(--bone);
  font-size: 15px;
  line-height: 1.7;
}
.page-faq .faq-need li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 9px;
  height: 9px;
  border: 2px solid var(--cyan);
}
.page-faq .faq-contact {
  margin-top: clamp(22px, 3vw, 30px);
  padding: 18px 20px;
  background: var(--ink-800);
  border-left: 4px solid var(--cyan);
}
.page-faq .faq-contact p {
  margin: 0;
  max-width: var(--faq-measure);
  color: var(--stone);
  font-size: 15px;
  line-height: 1.75;
}
.page-faq .faq-contact b {
  color: var(--bone);
  font-weight: 600;
}
.page-faq .faq-contact__line {
  margin-top: 12px !important;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.7;
}
.page-faq .faq-contact a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 206, .45);
}
.page-faq .faq-contact a:hover,
.page-faq .faq-contact a:focus-visible {
  border-bottom-color: var(--cyan);
  outline: none;
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-qa {
  margin-top: clamp(22px, 3vw, 30px);
  border-top: 1px solid var(--line);
}
.page-faq .faq-qa details {
  border-bottom: 1px solid var(--line-soft);
}
.page-faq .faq-qa summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 17px 46px 17px 0;
  font-family: var(--font-head);
  font-size: 17px;
  line-height: 1.4;
  color: var(--bone);
  transition: color .18s ease;
}
.page-faq .faq-qa summary::-webkit-details-marker {
  display: none;
}
.page-faq .faq-qa summary::after {
  content: "+";
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 19px;
  color: var(--cyan);
}
.page-faq .faq-qa details[open] summary::after {
  content: "−";
}
.page-faq .faq-qa summary:hover,
.page-faq .faq-qa summary:focus-visible {
  color: var(--cyan);
  outline: none;
}
.page-faq .faq-qa summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}
.page-faq .faq-qa details p {
  margin: 0 0 20px;
  padding-right: 30px;
  max-width: var(--faq-measure);
  color: var(--stone);
  font-size: 15px;
  line-height: 1.75;
}
.page-faq .faq-qa a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 206, .45);
}
.page-faq .faq-qa a:hover,
.page-faq .faq-qa a:focus-visible {
  border-bottom-color: var(--cyan);
  outline: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-faq .faq-plate-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .page-faq .faq-compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(28px, 4vw, 52px);
  }
  .page-faq .faq-list > li {
    padding-left: 68px;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: 224px minmax(0, 1fr);
    gap: 56px;
  }
  .page-faq .faq-index {
    position: sticky;
    top: 24px;
    border-top: 0;
    border-left: 2px solid var(--line);
    padding: 4px 0 4px 14px;
  }
  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-faq .faq-index__list li {
    flex: none;
  }
  .page-faq .faq-index__list a {
    border: 0;
    border-left: 3px solid transparent;
    background: none;
    padding: 9px 10px;
    white-space: normal;
  }
  .page-faq .faq-index__list a:hover,
  .page-faq .faq-index__list a:focus-visible {
    background: var(--ink-800);
    border-left-color: var(--cyan);
    border-radius: 0;
  }
  .page-faq .faq-order li {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 20px;
  }
}

@media (min-width: 1280px) {
  .page-faq .faq-layout {
    grid-template-columns: 248px minmax(0, 1fr);
    gap: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__list a,
  .page-faq .faq-qa summary {
    transition: none;
  }
}