/* ===== FB赛场 · 问题排查页 ===== */
.page-faq {
  --faq-paper-ink: #101725;
  --faq-paper-muted: rgba(16, 23, 37, .68);
  --faq-paper-line: rgba(16, 23, 37, .13);
  --faq-paper-line-strong: rgba(16, 23, 37, .26);
  --faq-cyan-deep: #0B7C80;
  --faq-orange-deep: #C24E00;
  padding-bottom: 0;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 46px;
  scroll-margin-top: 96px;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -10%;
  bottom: auto;
  left: -10%;
  height: 78%;
  background:
    radial-gradient(58% 62% at 16% 6%, rgba(45, 226, 230, .17), transparent 68%),
    radial-gradient(46% 54% at 88% 2%, rgba(255, 122, 26, .14), transparent 66%);
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-faq .faq-hero__title {
  margin: 12px 0 0;
  font-size: clamp(30px, 7vw, 58px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.022em;
  color: var(--fb-white);
}

.page-faq .faq-hero__lead {
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(255, 255, 255, .72);
  max-width: 56ch;
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 28px;
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--fb-line);
}

.page-faq .faq-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 104px;
}

.page-faq .faq-metric__num {
  font-family: var(--fb-font-mono);
  font-size: clamp(26px, 6.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--fb-white);
}

.page-faq .faq-metric__num--cyan { color: var(--fb-cyan); }
.page-faq .faq-metric__num--amber { color: var(--fb-amber); }
.page-faq .faq-metric__num--orange { color: var(--fb-orange); }

.page-faq .faq-metric__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--fb-mist);
  max-width: 15ch;
}

.page-faq .faq-hero__figure {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--fb-line);
  border-radius: var(--fb-radius);
  background: var(--fb-ink);
  box-shadow: var(--fb-shadow);
}

.page-faq .faq-hero__frame {
  overflow: hidden;
  border-radius: 8px;
  background: var(--fb-void);
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(.86) contrast(1.06) brightness(.9);
}

.page-faq .faq-hero__figure .fb-figure__cap {
  display: block;
  margin-top: 10px;
  padding: 0 4px 2px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--fb-mist);
}

/* ---------- 暖纸问答区 ---------- */
.page-faq .faq-body {
  position: relative;
  padding: 44px 0 54px;
  background: var(--fb-paper);
  color: var(--faq-paper-ink);
}

.page-faq .faq-body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--fb-cyan) 0%, var(--fb-cyan) 30%, var(--fb-orange) 76%, var(--fb-scarlet) 100%);
  opacity: .85;
}

.page-faq .faq-body::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-image: repeating-linear-gradient(90deg, rgba(16, 23, 37, .026) 0 1px, transparent 1px 72px);
  pointer-events: none;
}

.page-faq .faq-body__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

/* 分类索引 */
.page-faq .faq-index {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-faq .faq-index__title {
  font-family: var(--fb-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--faq-orange-deep);
}

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

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--faq-paper-line-strong);
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--faq-paper-ink);
  text-decoration: none;
  transition: border-color .2s var(--fb-ease), background-color .2s var(--fb-ease), color .2s var(--fb-ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-color: var(--faq-orange-deep);
  background: rgba(194, 78, 0, .08);
  color: var(--faq-orange-deep);
}

.page-faq .faq-index__dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--faq-cyan-deep);
}

.page-faq .faq-index__dot--cyan { background: var(--fb-cyan); }
.page-faq .faq-index__dot--amber { background: var(--fb-amber); }
.page-faq .faq-index__dot--scarlet { background: var(--fb-scarlet); }
.page-faq .faq-index__dot--orange { background: var(--fb-orange); }
.page-faq .faq-index__dot--paper { background: var(--faq-paper-line-strong); }

.page-faq .faq-index__note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--faq-paper-muted);
  max-width: 26ch;
}

/* 问答分组 */
.page-faq .faq-groups {
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: 100px;
}

.page-faq .faq-group + .faq-group {
  margin-top: 42px;
  padding-top: 36px;
  border-top: 1px solid var(--faq-paper-line);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--faq-paper-ink);
}

.page-faq .faq-group__index {
  flex: none;
  margin: 0;
  font-family: var(--fb-font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--faq-orange-deep);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(20px, 4.6vw, 27px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.015em;
  color: var(--faq-paper-ink);
}

.page-faq .faq-group__sub {
  margin: 14px 0 18px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--faq-paper-muted);
  max-width: 62ch;
}

/* 组内插图 */
.page-faq .faq-shot {
  margin: 0 0 10px;
}

.page-faq .faq-shot__frame {
  overflow: hidden;
  border-radius: 10px;
  border: 1px solid var(--faq-paper-line-strong);
  background: var(--fb-ink);
}

.page-faq .faq-shot__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.92) contrast(1.05) brightness(.94);
}

.page-faq .faq-shot .fb-figure__cap {
  display: block;
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--faq-paper-muted);
}

/* 折叠条目 */
.page-faq .faq-list {
  margin-top: 4px;
}

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

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 17px 2px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--faq-paper-ink);
  transition: color .2s var(--fb-ease);
}

.page-faq .faq-item__q::-webkit-details-marker { display: none; }
.page-faq .faq-item__q::marker { content: ""; }

.page-faq .faq-item__q:hover { color: var(--faq-orange-deep); }

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--faq-cyan-deep);
  outline-offset: 3px;
  border-radius: 4px;
}

.page-faq .faq-item__marker {
  position: relative;
  flex: none;
  width: 24px;
  height: 24px;
  margin-top: 2px;
  border: 1px solid var(--faq-paper-line-strong);
  border-radius: 50%;
  transition: border-color .2s var(--fb-ease), background-color .2s var(--fb-ease);
}

.page-faq .faq-item__marker::before,
.page-faq .faq-item__marker::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 1.6px;
  border-radius: 2px;
  background: var(--faq-paper-ink);
  transform: translate(-50%, -50%);
  transition: transform .24s var(--fb-ease), opacity .2s var(--fb-ease), background-color .2s var(--fb-ease);
}

.page-faq .faq-item__marker::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-faq .faq-item[open] .faq-item__marker {
  border-color: var(--faq-orange-deep);
  background: rgba(194, 78, 0, .09);
}

.page-faq .faq-item[open] .faq-item__marker::before {
  background: var(--faq-orange-deep);
}

.page-faq .faq-item[open] .faq-item__marker::after {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(0deg);
}

.page-faq .faq-item__a {
  padding: 0 32px 20px 0;
  animation: faq-reveal .26s var(--fb-ease) both;
}

.page-faq .faq-item__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--faq-paper-muted);
  max-width: 64ch;
}

.page-faq .faq-item__a p + p { margin-top: 10px; }

.page-faq .faq-item__a a {
  color: var(--faq-cyan-deep);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color .2s var(--fb-ease);
}

.page-faq .faq-item__a a:hover { color: var(--faq-orange-deep); }

@keyframes faq-reveal {
  from { opacity: 0; transform: translateY(-7px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 收尾 ---------- */
.page-faq .faq-tail {
  position: relative;
  padding: 52px 0 60px;
  background-color: var(--fb-void);
  background-image:
    radial-gradient(64% 92% at 12% 0%, rgba(255, 122, 26, .14), transparent 64%),
    radial-gradient(50% 80% at 92% 100%, rgba(45, 226, 230, .1), transparent 66%);
}

.page-faq .faq-tail__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-faq .faq-tail__title {
  margin: 10px 0 0;
  font-size: clamp(22px, 5.2vw, 34px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.018em;
  color: var(--fb-white);
}

.page-faq .faq-tail__desc {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(255, 255, 255, .7);
  max-width: 52ch;
}

.page-faq .faq-tail__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-faq .faq-top-link {
  font-size: 13px;
  color: var(--fb-mist);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--fb-line-strong);
  transition: color .2s var(--fb-ease), border-color .2s var(--fb-ease);
}

.page-faq .faq-top-link:hover,
.page-faq .faq-top-link:focus-visible {
  color: var(--fb-cyan);
  border-color: var(--fb-cyan);
}

/* ---------- 平板 / 桌面 ---------- */
@media (min-width: 768px) {
  .page-faq .faq-hero {
    padding: 40px 0 60px;
  }

  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: start;
    gap: 46px;
  }

  .page-faq .faq-hero__figure {
    margin-top: 28px;
  }

  .page-faq .faq-tail {
    padding: 64px 0 72px;
  }

  .page-faq .faq-tail__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 44px;
  }

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

@media (min-width: 900px) {
  .page-faq .faq-body {
    padding: 58px 0 72px;
  }

  .page-faq .faq-body__inner {
    grid-template-columns: 238px minmax(0, 1fr);
    gap: 54px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 6px;
  }

  .page-faq .faq-index__link {
    border-radius: 9px;
    justify-content: flex-start;
    padding: 9px 13px;
  }

  .page-faq .faq-group + .faq-group {
    margin-top: 54px;
    padding-top: 44px;
  }

  .page-faq .faq-item__q {
    font-size: 16.5px;
    padding: 19px 2px;
  }

  .page-faq .faq-item__a {
    padding-right: 74px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__a {
    animation: none;
  }

  .page-faq .faq-item__q,
  .page-faq .faq-item__marker,
  .page-faq .faq-item__marker::before,
  .page-faq .faq-item__marker::after,
  .page-faq .faq-index__link,
  .page-faq .faq-top-link,
  .page-faq .faq-item__a a {
    transition: none;
  }
}