.page-faq {
  --kb-top: calc(var(--hdr-bar) + var(--announce-h));
  --kb-body-color: #4a4f57;
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-faq .kb-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  padding: calc(var(--kb-top) + 26px) 0 clamp(44px, 7vw, 88px);
}

.page-faq .kb-hero__accent {
  position: absolute;
  top: -22%;
  right: -16%;
  width: 62%;
  height: 158%;
  background: linear-gradient(158deg, rgba(200, 16, 46, 0.95) 0%, rgba(122, 12, 28, 0.38) 44%, rgba(11, 11, 12, 0) 74%);
  transform: rotate(-11deg);
  pointer-events: none;
  z-index: 0;
}

.page-faq .kb-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--red) 0 42%, var(--gold) 42% 58%, var(--blue) 58% 100%);
  z-index: 2;
}

.page-faq .kb-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 6vw, 48px);
  align-items: center;
}

.page-faq .kb-hero .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0 0 clamp(20px, 4vw, 34px);
  padding: 0;
}

.page-faq .kb-hero .breadcrumb__item {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-70);
}

.page-faq .kb-hero .breadcrumb__link {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid var(--red);
  padding-bottom: 2px;
}

.page-faq .kb-hero__eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-faq .kb-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(34px, 8.4vw, 62px);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -0.02em;
  max-width: 14em;
}

.page-faq .kb-hero__lead {
  margin: 0;
  max-width: 44ch;
  font-size: clamp(16px, 4.2vw, 18px);
  line-height: 1.9;
  color: var(--ink-70);
}

.page-faq .kb-hero__index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-faq .kb-hero__index a {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--line-ink);
  border-radius: var(--r);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--paper);
  text-decoration: none;
  transition: background 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-faq .kb-hero__index a:hover {
  background: var(--red);
  border-color: var(--red);
}

.page-faq .kb-hero__media {
  margin: 0;
  border-top: 2px solid var(--red);
}

.page-faq .kb-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 86%, 0 100%);
}

/* ---------- 两栏主体 ---------- */
.page-faq .kb-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding: clamp(30px, 6vw, 62px) 0 clamp(52px, 8vw, 88px);
}

/* 目录：移动端吸附横向条 */
.page-faq .kb-side {
  position: sticky;
  top: var(--kb-top);
  z-index: 9;
  margin-inline: calc(-1 * var(--gutter));
  padding: 10px var(--gutter);
  background: rgba(246, 247, 244, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.page-faq .kb-side__title {
  display: none;
}

.page-faq .kb-side__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  scrollbar-width: none;
}

.page-faq .kb-side__list::-webkit-scrollbar {
  display: none;
}

.page-faq .kb-side__list > li {
  flex: 0 0 auto;
}

.page-faq .kb-side__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: #fff;
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.16s var(--ease), color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-faq .kb-side__link .chapter-nav__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mist);
}

.page-faq .kb-side__link.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.page-faq .kb-side__link.is-active .chapter-nav__idx {
  color: var(--gold);
}

/* ---------- 章节 ---------- */
.page-faq .kb-section {
  scroll-margin-top: calc(var(--kb-top) + 74px);
}

.page-faq .kb-section + .kb-section {
  margin-top: clamp(40px, 7vw, 68px);
}

.page-faq .kb-head {
  border-top: 2px solid var(--ink);
  padding-top: 16px;
  margin-bottom: clamp(22px, 4vw, 30px);
}

.page-faq .kb-head__idx {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--red);
}

.page-faq .kb-head__title {
  margin: 0 0 12px;
  font-size: clamp(24px, 5.6vw, 34px);
  line-height: 1.2;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-faq .kb-head__desc {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--kb-body-color);
}

/* 深色章节 */
.page-faq .kb-section--ink {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(26px, 5vw, 44px) clamp(20px, 4vw, 36px);
}

.page-faq .kb-section--ink .kb-head {
  border-top-color: var(--red);
}

.page-faq .kb-head--ink .kb-head__idx {
  color: var(--gold);
}

.page-faq .kb-head--ink .kb-head__desc {
  color: var(--ink-70);
}

/* ---------- 步骤 ---------- */
.page-faq .kb-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .kb-step {
  background: #fff;
  padding: 24px 22px 26px;
}

.page-faq .kb-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--red);
}

.page-faq .kb-step__title {
  margin: 14px 0 10px;
  font-size: 17.5px;
  font-weight: 800;
  line-height: 1.45;
}

.page-faq .kb-step__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--kb-body-color);
}

.page-faq .kb-step__text a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .kb-step__act {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--jade);
}

/* ---------- 术语表 ---------- */
.page-faq .kb-terms {
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 34px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-ink);
  border: 1px solid var(--line-ink);
}

.page-faq .kb-term {
  display: grid;
  gap: 7px;
  background: var(--carbon);
  padding: 15px 17px;
}

.page-faq .kb-term__k {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-faq .kb-term__v {
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-70);
}

.page-faq .kb-figure {
  margin: 0;
}

.page-faq .kb-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line-ink);
}

.page-faq .kb-figure__cap {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-70);
}

/* ---------- 端差异 ---------- */
.page-faq .kb-devices {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-faq .kb-device {
  position: relative;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  padding: 26px 22px 24px;
}

.page-faq .kb-device::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
}

.page-faq .kb-device--mobile::before {
  background: var(--red);
}

.page-faq .kb-device--desktop::before {
  background: var(--blue);
}

.page-faq .kb-device__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-faq .kb-device__metric {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
}

.page-faq .kb-device__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 9vw, 46px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
}

.page-faq .kb-device--mobile .kb-device__num {
  color: var(--red);
}

.page-faq .kb-device--desktop .kb-device__num {
  color: var(--blue);
}

.page-faq .kb-device__metricnote {
  margin: 8px 0 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .kb-device__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-faq .kb-device__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--kb-body-color);
}

.page-faq .kb-device__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 8px;
  height: 2px;
  background: var(--jade);
}

/* ---------- 下一步入口 ---------- */
.page-faq .kb-next {
  margin-top: clamp(24px, 4vw, 34px);
  border: 1px solid var(--ink);
  background: #fff;
  padding: 24px 22px;
  display: grid;
  gap: 12px;
}

.page-faq .kb-next__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--red);
}

.page-faq .kb-next__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
}

.page-faq .kb-next__cta {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  background: var(--red);
  border-radius: var(--r);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.16s var(--ease);
}

.page-faq .kb-next__cta:hover {
  background: var(--red-deep);
}

/* ---------- 问答手风琴 ---------- */
.page-faq .kb-faq {
  border-top: 1px solid var(--line);
}

.page-faq .kb-faq__item {
  border-bottom: 1px solid var(--line);
}

.page-faq .kb-faq__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 19px 0;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink);
}

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

.page-faq .kb-faq__q::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 500;
  line-height: 1.2;
  color: var(--red);
  transition: transform 0.2s var(--ease);
}

.page-faq .kb-faq__item[open] .kb-faq__q::after {
  transform: rotate(45deg);
}

.page-faq .kb-faq__a {
  margin: 0;
  padding: 0 0 22px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.92;
  color: var(--kb-body-color);
}

/* ---------- 联系 ---------- */
.page-faq .kb-contact {
  margin: 0 0 22px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-ink);
  border: 1px solid var(--line-ink);
}

.page-faq .kb-contact__row {
  background: var(--carbon);
  display: grid;
  gap: 5px;
  padding: 16px 18px;
}

.page-faq .kb-contact__row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-faq .kb-contact__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .kb-contact__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--paper);
  font-size: 14.5px;
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid var(--red);
  padding-bottom: 3px;
}

.page-faq .kb-contact__link:hover {
  color: var(--gold);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .kb-terms {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .kb-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .kb-contact__row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

@media (min-width: 860px) {
  .page-faq .kb-hero__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 60px);
  }

  .page-faq .kb-devices {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-faq .kb-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-faq .kb-body {
    grid-template-columns: 224px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-faq .kb-side {
    position: sticky;
    top: calc(var(--kb-top) + 34px);
    z-index: 1;
    margin-inline: 0;
    padding: 0;
    background: none;
    backdrop-filter: none;
    border-bottom: 0;
  }

  .page-faq .kb-side__title {
    display: block;
    margin: 0 0 14px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.16em;
    color: var(--mist);
    text-transform: uppercase;
  }

  .page-faq .kb-side__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-faq .kb-side__list > li {
    flex: 1 1 auto;
  }

  .page-faq .kb-side__link {
    display: flex;
    width: 100%;
    white-space: normal;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    background: none;
    padding: 11px 12px;
    font-size: 13.5px;
    font-weight: 600;
    color: var(--ink);
  }

  .page-faq .kb-side__link.is-active {
    background: none;
    color: var(--red);
    border-left-color: var(--red);
  }

  .page-faq .kb-side__link.is-active .chapter-nav__idx {
    color: var(--red);
  }

  .page-faq .kb-side__link:hover {
    border-left-color: var(--red);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .kb-faq__q::after,
  .page-faq .kb-hero__index a,
  .page-faq .kb-side__link,
  .page-faq .kb-next__cta {
    transition: none;
  }
}
<<<END>>>