.page-faq {
  padding-bottom: calc(var(--dock-h) + 36px);
  background:
    radial-gradient(1100px 360px at 84% -6%, rgba(102, 217, 184, .16), transparent 62%),
    linear-gradient(180deg, var(--salt) 0%, var(--paper) 46%, var(--salt) 100%);
  color: var(--body);
}

.page-faq a {
  color: var(--coral-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(185, 56, 31, .32);
  transition: border-color .18s ease, color .18s ease;
}

.page-faq a:hover {
  border-bottom-color: var(--coral);
}

/* ---------- 首屏框景 ---------- */
.page-faq .guide-hero {
  padding: 26px 0 8px;
}

.page-faq .guide-hero .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--tide-line);
}

.page-faq .guide-hero .breadcrumb a {
  color: var(--tide-line);
  border-bottom-color: transparent;
}

.page-faq .guide-hero .breadcrumb a:hover {
  border-bottom-color: var(--coral);
}

.page-faq .guide-hero .breadcrumb span[aria-current] {
  color: var(--coral-deep);
}

.page-faq .guide-hero__frame {
  position: relative;
  overflow: hidden;
  padding: 42px 20px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(152deg, rgba(11, 53, 80, .06), transparent 56%),
    var(--paper);
  box-shadow: var(--shadow-2);
}

.page-faq .guide-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 12px;
  border-bottom: 1px solid var(--line);
  background-image: repeating-linear-gradient(90deg, rgba(11, 53, 80, .3) 0 1px, transparent 1px 16px);
}

.page-faq .guide-hero__frame::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 80px;
  height: 80px;
  border-radius: 0 0 var(--radius) 0;
  background: linear-gradient(225deg, rgba(102, 217, 184, .38), transparent 72%);
  pointer-events: none;
}

.page-faq .guide-hero h1 {
  margin: 10px 0 16px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 6.4vw, 52px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-faq .guide-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--body);
}

.page-faq .guide-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 22px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
}

.page-faq .guide-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 7px;
  font-size: 13px;
  color: var(--body);
}

.page-faq .guide-hero__facts .mono {
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 600;
  color: var(--deep);
}

/* ---------- 四步路径 ---------- */
.page-faq .guide-steps {
  padding: 42px 0 12px;
}

.page-faq .guide-steps .eyebrow {
  margin-bottom: 6px;
}

.page-faq .guide-steps h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 4vw, 34px);
  line-height: 1.3;
  color: var(--ink);
}

.page-faq .step-rail {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 24px 0 0;
  padding: 0;
}

.page-faq .step-rail__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-faq .step-rail__item:first-child {
  border-top: none;
}

.page-faq .step-rail__num {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--paper);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--deep);
}

.page-faq .step-rail__item:first-child .step-rail__num {
  background: var(--deep);
  border-color: var(--deep);
  color: #fff;
}

.page-faq .step-rail__title {
  margin: 7px 0 6px;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-faq .step-rail__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--body);
}

.page-faq .guide-steps__figure {
  margin: 26px 0 0;
}

.page-faq .guide-steps__figure img,
.page-faq .faq-export__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
}

/* ---------- 两栏主体 ---------- */
.page-faq .guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: 44px;
  padding-bottom: 64px;
}

.page-faq .guide-index {
  padding: 16px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow-1);
}

.page-faq .guide-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--tide-line);
}

.page-faq .index-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq .index-nav a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--deep);
  font-size: 13px;
  white-space: nowrap;
  transition: border-color .18s ease, background-color .18s ease, color .18s ease;
}

.page-faq .index-nav a .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--tide-line);
}

.page-faq .index-nav a:hover {
  border-color: var(--coral);
}

.page-faq .index-nav a.is-active {
  background: var(--coral);
  border-color: var(--coral);
  color: #fff;
}

.page-faq .index-nav a.is-active .mono {
  color: rgba(255, 255, 255, .82);
}

/* ---------- 章节 ---------- */
.page-faq .chapter {
  scroll-margin-top: 100px;
  margin-bottom: 34px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line);
}

.page-faq .chapter:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.page-faq .chapter__kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--tide-line);
}

.page-faq .chapter__kicker::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--coral);
}

.page-faq .chapter h2 {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(21px, 3.6vw, 29px);
  line-height: 1.36;
  color: var(--ink);
}

.page-faq .chapter__lead {
  margin: 0 0 6px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--body);
}

.page-faq .chapter__note {
  margin: 16px 0 0;
  padding: 13px 15px;
  border-left: 2px solid var(--mint);
  border-radius: 0 8px 8px 0;
  background: linear-gradient(90deg, var(--mint-mist), rgba(216, 245, 234, 0));
  font-size: 14px;
  line-height: 1.74;
  color: var(--body);
}

/* 手机端操作步骤 */
.page-faq .micro-steps {
  list-style: none;
  counter-reset: faqstep;
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
}

.page-faq .micro-steps li {
  counter-increment: faqstep;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 12px;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
  box-shadow: var(--shadow-1);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--body);
}

.page-faq .micro-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--coral-deep);
}

/* 参数行 */
.page-faq .detail-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  border-top: 1px dashed var(--line);
}

.page-faq .detail-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 18px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14.5px;
  line-height: 1.6;
}

.page-faq .detail-list__k {
  font-weight: 500;
  color: var(--body);
}

.page-faq .detail-list__v {
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--deep);
}

/* 导出三段卡 */
.page-faq .export-cards {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
}

.page-faq .export-cards li {
  padding: 16px 15px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
  box-shadow: var(--shadow-1);
}

.page-faq .export-cards__idx {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--coral-deep);
}

.page-faq .export-cards h3 {
  margin: 0 0 6px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-faq .export-cards p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--body);
}

.page-faq .faq-export__figure {
  margin: 22px 0 0;
}

/* 手风琴问答 */
.page-faq .qa-list {
  margin: 18px 0 0;
  border-top: 1px solid var(--line);
}

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

.page-faq .qa__q {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--ink);
}

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

.page-faq .qa__q:hover .qa__text {
  color: var(--coral-deep);
}

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 3px;
  border-radius: 6px;
}

.page-faq .qa__mark {
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 3px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper);
  transition: background-color .18s ease, border-color .18s ease;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--deep);
  transition: transform .18s ease, opacity .18s ease;
}

.page-faq .qa__mark::before {
  left: 4px;
  right: 4px;
  top: 50%;
  height: 1.5px;
  transform: translateY(-50%);
}

.page-faq .qa__mark::after {
  top: 4px;
  bottom: 4px;
  left: 50%;
  width: 1.5px;
  transform: translateX(-50%);
}

.page-faq .qa[open] .qa__mark {
  background: var(--coral);
  border-color: var(--coral);
}

.page-faq .qa[open] .qa__mark::before,
.page-faq .qa[open] .qa__mark::after {
  background: #fff;
}

.page-faq .qa[open] .qa__mark::after {
  transform: translateX(-50%) scaleY(0);
}

.page-faq .qa__a {
  padding: 0 0 18px 32px;
}

.page-faq .qa__a p {
  margin: 0;
  padding: 12px 14px;
  border-radius: 8px;
  background: var(--mint-mist);
  font-size: 14px;
  line-height: 1.76;
  color: var(--body);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 640px) {
  .page-faq .export-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-faq .step-rail {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-faq .step-rail__item {
    display: block;
    padding: 22px 0 0;
    border-top: 2px solid var(--line);
  }

  .page-faq .step-rail__item:first-child {
    padding-top: 22px;
    border-top-color: var(--deep);
  }

  .page-faq .step-rail__num {
    margin-bottom: 12px;
  }

  .page-faq .step-rail__title {
    margin: 0 0 8px;
  }
}

@media (min-width: 940px) {
  .page-faq .guide-hero__frame {
    padding: 56px 44px 38px;
  }

  .page-faq .guide-layout {
    grid-template-columns: 264px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-faq .guide-index {
    position: sticky;
    top: 96px;
    padding: 20px 16px;
  }

  .page-faq .index-nav {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-faq .index-nav a {
    padding: 9px 10px;
    border-color: transparent;
    border-left: 2px solid transparent;
    border-radius: 8px;
    font-size: 13.5px;
    white-space: normal;
  }

  .page-faq .index-nav a:hover {
    background: var(--salt);
  }

  .page-faq .index-nav a.is-active {
    background: var(--mint-mist);
    border-color: transparent;
    border-left-color: var(--coral);
    color: var(--ink);
  }

  .page-faq .index-nav a.is-active .mono {
    color: var(--coral-deep);
  }

  .page-faq .qa__a {
    padding-left: 32px;
    padding-right: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .index-nav a,
  .page-faq .qa__mark,
  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after,
  .page-faq a {
    transition: none;
  }
}