.page-faq {
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-faq .breadcrumb {
  padding: 14px 0 0;
}

/* ---------- 首屏 ---------- */
.page-faq .kb-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3.5vw, 44px) 0 clamp(22px, 3.5vw, 38px);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .kb-hero::after {
  content: "";
  position: absolute;
  top: -110px;
  right: -80px;
  width: 340px;
  height: 340px;
  background: radial-gradient(circle at 50% 50%, rgba(0, 240, 200, 0.16), transparent 68%);
  pointer-events: none;
}

.page-faq .kb-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-faq .kb-hero h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.012em;
  max-width: 16ch;
}

.page-faq .kb-hero__lede {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--silver);
}

.page-faq .kb-hero__quick {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-faq .kb-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .kb-stat {
  background: var(--ink-800);
  padding: 14px 16px;
}

.page-faq .kb-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--signal);
}

.page-faq .kb-stat__label {
  font-size: 12.5px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* ---------- 双栏骨架 ---------- */
.page-faq .kb__layout {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  padding: clamp(24px, 4vw, 48px) 0 0;
}

.page-faq .kb__main {
  min-width: 0;
}

/* ---------- 左侧索引 ---------- */
.page-faq .kb__rail {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(22, 54, 46, 0.85), rgba(17, 19, 18, 0.9));
  padding: 16px 14px 14px;
}

.page-faq .kb__rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-faq .kb-index {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .kb-index__item + .kb-index__item {
  margin-top: 2px;
}

.page-faq .kb-index__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 9px 8px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--silver);
  font-size: 14.5px;
  text-decoration: none;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.page-faq .kb-index__link:hover,
.page-faq .kb-index__link:focus-visible {
  background: rgba(0, 240, 200, 0.08);
  color: var(--signal-soft);
  border-left-color: var(--signal);
}

.page-faq .kb-index__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--signal);
}

.page-faq .kb-index__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--muted);
}

.page-faq .kb__rail-foot {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}

.page-faq .kb__rail-note {
  margin: 0 0 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .kb__rail-link {
  display: inline-block;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--signal-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 240, 200, 0.4);
}

.page-faq .kb__rail-link:hover,
.page-faq .kb__rail-link:focus-visible {
  color: var(--signal);
}

/* ---------- 问答区 ---------- */
.page-faq .kb-sec {
  scroll-margin-top: calc(var(--header-h) + 20px);
  padding-bottom: clamp(26px, 4vw, 44px);
}

.page-faq .kb-sec + .kb-sec {
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--line-soft);
}

.page-faq .kb-sec__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-faq .kb-sec__num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--warm);
}

.page-faq .kb-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.7vw, 27px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .kb-sec__desc {
  margin: 8px 0 14px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
  max-width: 56ch;
}

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

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

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 2px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: clamp(15.5px, 2vw, 18px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
  transition: color 180ms ease;
}

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

.page-faq .qa__q:hover,
.page-faq .qa__q:focus-visible {
  color: var(--signal-soft);
}

.page-faq .qa__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 400;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.page-faq .qa__q::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 400;
  line-height: 1;
  color: var(--signal);
}

.page-faq .qa[open] > .qa__q::after {
  content: "−";
  color: var(--warm);
}

.page-faq .qa__a {
  padding: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--silver);
}

.page-faq .qa__a p {
  margin: 0;
}

.page-faq .qa__steps,
.page-faq .qa__list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
}

.page-faq .qa__steps li {
  position: relative;
  padding-left: 32px;
  margin-top: 9px;
}

.page-faq .qa__steps li:first-child {
  margin-top: 0;
}

.page-faq .qa__steps li::before {
  counter-increment: faqstep;
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  color: var(--signal);
}

.page-faq .qa__steps li::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 20px;
  bottom: -9px;
  width: 1px;
  background: var(--line-strong);
}

.page-faq .qa__steps li:last-child::after {
  display: none;
}

.page-faq .qa__list li {
  position: relative;
  padding-left: 18px;
  margin-top: 8px;
}

.page-faq .qa__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 1px;
  background: var(--signal);
}

.page-faq .qa__tip {
  margin-top: 12px !important;
  padding: 10px 12px;
  border-left: 2px solid var(--warm);
  background: rgba(255, 138, 61, 0.08);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 配图 ---------- */
.page-faq .kb-figure {
  margin: 20px 0 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-700);
}

.page-faq .kb-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .kb-figure figcaption {
  padding: 10px 13px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  background: var(--ink-800);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 使用指南 ---------- */
.page-faq .guide {
  margin-top: clamp(30px, 5vw, 60px);
  padding-top: clamp(24px, 4vw, 40px);
  border-top: 1px solid var(--line-strong);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-faq .guide__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 38px);
  letter-spacing: -0.012em;
  color: var(--paper);
}

.page-faq .guide__lede {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--silver);
}

.page-faq .guide__grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-faq .guide__card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 17px 16px 18px;
  background: var(--ink-700);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  transition: border-color 180ms ease, transform 180ms ease;
}

.page-faq .guide__card:hover {
  border-color: rgba(0, 240, 200, 0.45);
  transform: translateY(-2px);
}

.page-faq .guide__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--signal);
}

.page-faq .guide__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-faq .guide__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--silver);
}

.page-faq .guide__meta {
  margin-top: auto;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--muted);
}

.page-faq .guide__videos {
  margin-top: clamp(24px, 3.5vw, 36px);
  padding: 16px 16px 18px;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

.page-faq .guide__sub {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--signal-soft);
}

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

.page-faq .video-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 2px;
  border-bottom: 1px dashed var(--line-soft);
  font-size: 14px;
  color: var(--silver);
}

.page-faq .video-item:last-child {
  border-bottom: 0;
}

.page-faq .video-item__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--warm);
}

.page-faq .video-item__name {
  min-width: 0;
}

.page-faq .video-item__time {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--muted);
}

/* ---------- 尾部行动区 ---------- */
.page-faq .kb-cta {
  display: grid;
  gap: 18px;
  margin-top: clamp(28px, 4vw, 48px);
  padding: clamp(20px, 3.5vw, 34px);
  background: linear-gradient(135deg, rgba(0, 240, 200, 0.1), rgba(255, 138, 61, 0.08));
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}

.page-faq .kb-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.8vw, 28px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .kb-cta__text {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--silver);
}

.page-faq .kb-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-faq .qa__a {
    padding-left: 36px;
  }

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

  .page-faq .video-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 22px;
  }

  .page-faq .video-item:nth-last-child(2) {
    border-bottom: 0;
  }
}

@media (min-width: 900px) {
  .page-faq .kb-hero__inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-faq .kb__layout {
    grid-template-columns: 268px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
    align-items: start;
  }

  .page-faq .kb__rail {
    position: sticky;
    top: calc(var(--header-h) + 18px);
  }

  .page-faq .kb-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-faq .kb-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1120px) {
  .page-faq .guide__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-faq .guide__card:last-child:nth-child(3n + 1) {
    grid-column: span 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .kb-index__link,
  .page-faq .qa__q,
  .page-faq .guide__card {
    transition: none;
  }

  .page-faq .guide__card:hover {
    transform: none;
  }
}