.page-faq {
  --faq-line: rgba(141, 154, 192, .22);
  --faq-line-hot: rgba(47, 233, 218, .45);
  --faq-surface: rgba(18, 26, 60, .58);
  --faq-ink: var(--oy-mist);
  padding-bottom: clamp(60px, 9vw, 110px);
}

.page-faq p {
  margin: 0 0 10px;
}

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

/* ---------- 顶部上下文 ---------- */

.faq-topline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: clamp(88px, 12vw, 132px);
  padding-bottom: 16px;
}

.page-faq .oy-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--oy-fs-13);
  color: var(--oy-slate);
  flex-wrap: wrap;
}

.page-faq .oy-breadcrumb a {
  color: var(--oy-slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s ease, border-color .25s ease;
}

.page-faq .oy-breadcrumb a:hover,
.page-faq .oy-breadcrumb a:focus-visible {
  color: var(--oy-cyan);
  border-bottom-color: var(--faq-line-hot);
}

.faq-topline__note {
  writing-mode: horizontal-tb;
  letter-spacing: .1em;
}

/* ---------- 首屏 ---------- */

.faq-hero {
  position: relative;
  padding-bottom: clamp(38px, 6vw, 72px);
}

.faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
}

.faq-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--oy-fs-13);
  color: var(--oy-slate);
  letter-spacing: .08em;
  margin: 0 0 14px;
}

.faq-hero__eyebrow .oy-mono {
  padding: 3px 8px;
  border: 1px solid var(--oy-line-warm);
  border-radius: var(--oy-r-pill);
  color: var(--oy-bronze);
  font-size: var(--oy-fs-12);
}

.faq-hero__title {
  font-size: clamp(32px, 6.6vw, 76px);
  line-height: 1.02;
  letter-spacing: -.025em;
  margin: 0 0 18px;
  max-width: 16em;
}

.faq-hero__sub {
  max-width: 50ch;
  color: var(--oy-mist);
  opacity: .84;
  line-height: 1.75;
  margin-bottom: 24px;
}

.faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.faq-hero__aside {
  display: grid;
  gap: 14px;
  align-content: start;
}

.faq-hero__plaque {
  position: relative;
  padding: 18px 20px;
  border: 1px solid var(--oy-line);
  border-left: 2px solid var(--oy-cyan);
  border-radius: var(--oy-r-md);
  background: linear-gradient(150deg, var(--faq-surface), rgba(8, 13, 31, .35));
  box-shadow: var(--oy-shadow);
}

.faq-hero__plaque--alt {
  border-left-color: var(--oy-orange);
}

.faq-hero__plaque .oy-annotation {
  writing-mode: horizontal-tb;
  display: block;
  font-size: var(--oy-fs-12);
  letter-spacing: .1em;
}

.faq-hero__big {
  display: block;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.15;
  color: var(--oy-cyan);
  margin: 8px 0 8px;
}

.faq-hero__plaque--alt .faq-hero__big {
  color: var(--oy-orange);
}

.faq-hero__plaque p {
  font-size: var(--oy-fs-13);
  color: var(--oy-slate);
  line-height: 1.7;
}

/* ---------- 手册骨架 ---------- */

.faq-manual {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 40px);
}

.faq-rail {
  display: none;
}

.faq-scale {
  display: none;
}

/* ---------- 章节通用 ---------- */

.faq-flow {
  min-width: 0;
}

.faq-block {
  position: relative;
  padding-top: clamp(34px, 5.5vw, 58px);
  border-top: 1px solid var(--faq-line);
  scroll-margin-top: 112px;
}

.faq-block:first-child {
  border-top: 0;
  padding-top: 0;
}

.faq-block + .faq-block {
  margin-top: clamp(34px, 5.5vw, 58px);
}

.faq-block__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 26px);
  align-items: start;
  margin-bottom: 16px;
}

.faq-block__num {
  font-size: clamp(30px, 4.6vw, 52px);
  line-height: .92;
  letter-spacing: -.04em;
  color: var(--oy-bronze);
  opacity: .82;
}

.faq-block__title {
  font-size: clamp(21px, 3vw, 34px);
  line-height: 1.22;
  letter-spacing: -.012em;
  margin: 0 0 10px;
  color: var(--oy-mist);
}

.faq-block__tag {
  writing-mode: horizontal-tb;
  display: inline-block;
  font-size: var(--oy-fs-13);
  color: var(--oy-slate);
  letter-spacing: .02em;
}

.faq-block__intro {
  max-width: 66ch;
  color: var(--oy-mist);
  opacity: .84;
  line-height: 1.75;
  margin-bottom: 22px;
}

.faq-block__link {
  margin-top: 20px;
  padding-top: 14px;
  border-top: 1px dashed var(--faq-line);
  font-size: var(--oy-fs-13);
  color: var(--oy-slate);
  line-height: 1.7;
}

.faq-block__link a {
  color: var(--oy-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--faq-line-hot);
}

.faq-block__link a:hover,
.faq-block__link a:focus-visible {
  color: var(--oy-mist);
  border-bottom-color: var(--oy-mist);
}

.faq-block--recover {
  padding-inline: clamp(16px, 3vw, 30px);
  padding-bottom: clamp(24px, 4vw, 38px);
  border-radius: var(--oy-r-md);
  background:
    radial-gradient(130% 70% at 100% 0%, rgba(110, 75, 255, .16), transparent 62%),
    radial-gradient(90% 60% at 0% 100%, rgba(47, 233, 218, .09), transparent 60%);
}

.faq-block--export {
  padding-inline: clamp(16px, 3vw, 30px);
  padding-bottom: clamp(24px, 4vw, 38px);
  border-radius: var(--oy-r-md);
  background: linear-gradient(170deg, rgba(6, 51, 60, .5), rgba(8, 13, 31, .12) 70%);
}

.faq-block--version {
  padding-inline: clamp(16px, 3vw, 30px);
  padding-bottom: clamp(24px, 4vw, 38px);
  border-radius: var(--oy-r-md);
  background: linear-gradient(190deg, rgba(78, 16, 46, .42), rgba(8, 13, 31, .12) 68%);
}

/* ---------- 三步自检 ---------- */

.faq-checks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.faq-checks__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 13px;
  padding: 18px;
  border: 1px solid var(--oy-line);
  border-radius: var(--oy-r-md);
  background: linear-gradient(165deg, var(--faq-surface), rgba(8, 13, 31, .3));
  box-shadow: var(--oy-shadow);
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}

.faq-checks__item:hover {
  transform: translateY(-4px);
  border-color: var(--faq-line-hot);
  box-shadow: var(--oy-shadow-lift);
}

.faq-checks__box {
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 4px;
  border: 1px solid var(--oy-line-strong);
  border-radius: 4px;
  flex: none;
}

.faq-checks__box::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 2px;
  background: var(--oy-cyan);
  opacity: .35;
  transform: scale(.4);
  transition: transform .3s ease, opacity .3s ease;
}

.faq-checks__item:hover .faq-checks__box::after {
  opacity: 1;
  transform: scale(1);
}

.faq-checks__title {
  font-size: var(--oy-fs-18);
  line-height: 1.4;
  margin: 0 0 8px;
  color: var(--oy-mist);
}

.faq-checks__text {
  font-size: var(--oy-fs-16);
  line-height: 1.72;
  color: var(--oy-mist);
  opacity: .8;
}

.faq-checks__verdict {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--faq-line);
  font-size: var(--oy-fs-13);
  line-height: 1.7;
  color: var(--oy-bronze);
}

.faq-checks__verdict .oy-mono {
  margin-right: 7px;
  color: var(--oy-slate);
  letter-spacing: .08em;
  font-size: var(--oy-fs-12);
}

/* ---------- 图片 ---------- */

.faq-figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  border: 1px solid var(--oy-line);
  border-radius: var(--oy-r-md);
  overflow: hidden;
  background: rgba(6, 51, 60, .32);
  box-shadow: var(--oy-shadow);
}

.faq-figure--wide {
  background: rgba(18, 26, 60, .5);
}

.faq-figure .oy-media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.faq-figure .oy-media__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--oy-line);
  background: rgba(8, 13, 31, .55);
  font-size: var(--oy-fs-13);
  line-height: 1.7;
  color: var(--oy-slate);
}

/* ---------- 折叠步骤 ---------- */

.faq-panels {
  margin-top: 6px;
}

.faq-panel {
  border: 1px solid var(--oy-line);
  border-radius: var(--oy-r-md);
  background: rgba(12, 18, 42, .58);
  box-shadow: var(--oy-shadow);
  overflow: hidden;
  transition: border-color .3s ease;
}

.faq-panel + .faq-panel {
  margin-top: 10px;
}

.faq-panel[open] {
  border-color: var(--faq-line-hot);
}

.faq-panel__sum {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 13px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  color: var(--oy-mist);
  font-size: var(--oy-fs-16);
  font-weight: 500;
  line-height: 1.5;
}

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

.faq-panel__sum:hover {
  color: var(--oy-cyan);
}

.faq-panel__no {
  font-size: var(--oy-fs-12);
  letter-spacing: .1em;
  color: var(--oy-bronze);
}

.faq-panel__chev {
  width: 9px;
  height: 9px;
  border-right: 1px solid var(--oy-slate);
  border-bottom: 1px solid var(--oy-slate);
  transform: rotate(45deg) translate(-1px, -1px);
  transition: transform .3s ease, border-color .3s ease;
}

.faq-panel[open] .faq-panel__chev {
  transform: rotate(-135deg) translate(-1px, -1px);
  border-color: var(--oy-cyan);
}

.faq-panel__body {
  padding: 14px 18px 18px;
  border-top: 1px dashed var(--faq-line);
  font-size: var(--oy-fs-16);
  line-height: 1.78;
  color: var(--oy-mist);
  opacity: .84;
}

/* ---------- 导出异常 ---------- */

.faq-issues {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.faq-issue {
  display: flex;
  flex-direction: column;
  padding: 18px;
  border: 1px solid var(--oy-line);
  border-top: 2px solid var(--oy-orange);
  border-radius: var(--oy-r-md);
  background: linear-gradient(180deg, rgba(8, 13, 31, .55), rgba(6, 51, 60, .3));
  box-shadow: var(--oy-shadow);
  transition: transform .3s ease, border-color .3s ease;
}

.faq-issue:hover {
  transform: translateY(-4px);
  border-top-color: var(--oy-cyan);
}

.faq-issue .oy-tag {
  align-self: flex-start;
}

.faq-issue__title {
  font-size: var(--oy-fs-18);
  line-height: 1.4;
  margin: 12px 0 8px;
  color: var(--oy-mist);
}

.faq-issue__text {
  font-size: var(--oy-fs-16);
  line-height: 1.74;
  color: var(--oy-mist);
  opacity: .8;
  flex: 1;
}

.faq-issue__fix {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--faq-line);
  font-size: var(--oy-fs-13);
  line-height: 1.7;
  color: var(--oy-cyan);
}

.faq-issue__fix .oy-mono {
  margin-right: 7px;
  color: var(--oy-bronze);
  font-size: var(--oy-fs-12);
  letter-spacing: .08em;
}

/* ---------- 数字差异 ---------- */

.faq-deltas {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.faq-deltas__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 26px);
  align-items: start;
  padding: 20px 0;
  border-top: 1px solid var(--faq-line);
}

.faq-deltas__row:last-child {
  border-bottom: 1px solid var(--faq-line);
}

.faq-deltas__t {
  font-size: clamp(16px, 2vw, 22px);
  line-height: 1.2;
  color: var(--oy-cyan);
  letter-spacing: -.02em;
  min-width: 4.2em;
}

.faq-deltas__title {
  font-size: var(--oy-fs-18);
  line-height: 1.4;
  margin: 0 0 7px;
  color: var(--oy-mist);
}

.faq-deltas__body p {
  font-size: var(--oy-fs-16);
  line-height: 1.74;
  color: var(--oy-mist);
  opacity: .8;
  max-width: 62ch;
}

/* ---------- 信息清单 ---------- */

.faq-fields {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.faq-fields__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--faq-line);
}

.faq-fields__row:first-child {
  border-top: 1px solid var(--faq-line);
}

.faq-fields__key {
  font-size: var(--oy-fs-13);
  letter-spacing: .08em;
  color: var(--oy-bronze);
}

.faq-fields__val {
  margin: 0;
  font-size: var(--oy-fs-16);
  line-height: 1.74;
  color: var(--oy-mist);
  opacity: .84;
}

/* ---------- 联系 ---------- */

.faq-contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 6px;
}

.faq-contact__card {
  display: flex;
  flex-direction: column;
  padding: 18px 20px;
  border: 1px solid var(--oy-line);
  border-radius: var(--oy-r-md);
  background: linear-gradient(160deg, var(--faq-surface), rgba(8, 13, 31, .3));
  box-shadow: var(--oy-shadow);
}

.faq-contact__key {
  writing-mode: horizontal-tb;
  font-size: var(--oy-fs-12);
  letter-spacing: .12em;
  color: var(--oy-slate);
}

.faq-contact__val {
  display: block;
  margin: 8px 0 10px;
  font-size: var(--oy-fs-18);
  color: var(--oy-cyan);
  word-break: break-word;
}

.faq-contact__note {
  font-size: var(--oy-fs-13);
  line-height: 1.7;
  color: var(--oy-slate);
}

.faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.faq-contact__aside {
  margin-top: 18px;
  padding: 14px 16px;
  border-left: 2px solid var(--oy-bronze);
  background: rgba(8, 13, 31, .45);
  border-radius: 0 var(--oy-r-sm) var(--oy-r-sm) 0;
  font-size: var(--oy-fs-13);
  line-height: 1.72;
  color: var(--oy-slate);
}

/* ---------- 中屏 ---------- */

@media (min-width: 700px) {
  .faq-checks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .faq-fields__row {
    grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 860px) {
  .faq-issues {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .faq-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .85fr);
    align-items: end;
  }
}

/* ---------- 桌面：左侧编号列 + 右侧刻度 ---------- */

@media (min-width: 1080px) {
  .faq-checks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .faq-manual {
    grid-template-columns: 168px minmax(0, 1fr) 44px;
    gap: clamp(24px, 3.2vw, 52px);
    align-items: start;
  }

  .faq-rail {
    display: block;
    position: sticky;
    top: 108px;
    padding-left: 16px;
    border-left: 1px solid var(--faq-line);
  }

  .faq-rail__label {
    writing-mode: horizontal-tb;
    display: block;
    font-size: var(--oy-fs-12);
    letter-spacing: .14em;
    color: var(--oy-bronze);
  }

  .faq-rail__list {
    list-style: none;
    margin: 14px 0 0;
    padding: 0;
    display: grid;
    gap: 13px;
  }

  .faq-rail__list a {
    display: flex;
    gap: 9px;
    align-items: baseline;
    font-size: var(--oy-fs-13);
    line-height: 1.45;
    color: var(--oy-slate);
    text-decoration: none;
    transition: color .25s ease;
  }

  .faq-rail__list a .oy-mono {
    font-size: var(--oy-fs-12);
    color: var(--oy-bronze);
    opacity: .75;
  }

  .faq-rail__list a:hover,
  .faq-rail__list a:focus-visible {
    color: var(--oy-cyan);
  }

  .faq-scale {
    display: flex;
    flex-direction: column;
    gap: 11px;
    position: sticky;
    top: 112px;
    padding-top: 4px;
    align-items: flex-end;
  }

  .faq-scale__tick {
    display: block;
    width: 14px;
    height: 1px;
    background: var(--faq-line);
  }

  .faq-scale__tick--major {
    width: 30px;
    height: 1px;
    background: var(--oy-bronze);
    opacity: .65;
  }
}

@media (min-width: 1240px) {
  .faq-hero__title {
    letter-spacing: -.03em;
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-checks__item,
  .page-faq .faq-issue,
  .page-faq .faq-panel__chev,
  .page-faq .faq-checks__box::after {
    transition: none;
  }

  .page-faq .faq-checks__item:hover,
  .page-faq .faq-issue:hover {
    transform: none;
  }
}