.page-faq {
  --faq-panel-line: var(--line);
  background-color: var(--ink);
  color: var(--white);
  padding-bottom: clamp(4.5rem, 10vw, 9rem);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: clamp(2.5rem, 7vw, 5rem) 0 clamp(2.25rem, 5vw, 3.75rem);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.22;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: min(40%, 380px);
  height: 4px;
  background-color: var(--signal);
}

.page-faq .faq-hero__inner {
  position: relative;
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 1rem;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--grass);
}

.page-faq .faq-hero__title {
  margin: 0 0 1.25rem;
  max-width: 22ch;
  font-family: var(--narrow);
  font-weight: 800;
  font-size: clamp(2.1rem, 5.6vw, 4rem);
  line-height: 1.06;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.1vw, 1.0625rem);
  line-height: 1.8;
  color: var(--cold);
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1.5rem, 5vw, 3.5rem);
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.page-faq .faq-stat {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.page-faq .faq-stat__num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-faq .faq-stat__label {
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--cold);
}

/* ---------- 主体栅格 ---------- */
.page-faq .faq-body-grid {
  display: block;
  padding-top: clamp(1.75rem, 4vw, 3rem);
}

/* ---------- 左侧索引 ---------- */
.page-faq .faq-index {
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-faq .faq-index__figure {
  margin: 0 0 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  background-color: var(--field);
}

.page-faq .faq-index__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-faq .faq-index__nav {
  display: none;
}

.page-faq .faq-index__caption {
  margin: 0 0 0.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cold);
}

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

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.8rem 0.35rem;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--cold);
  transition: color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--white);
  background-color: var(--field);
}

.page-faq .faq-index__num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--grass);
}

.page-faq .faq-index__name {
  font-size: 0.9375rem;
  font-weight: 500;
}

.page-faq .faq-index__count {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.72rem;
  color: var(--line);
}

/* ---------- 移动端分组标签条 ---------- */
.page-faq .faq-tagbar {
  display: flex;
  gap: 0.5rem;
  margin: 0 0 1.5rem;
  padding: 0 0 1rem;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-faq .faq-tagbar .tag {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  flex: 0 0 auto;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  color: var(--cold);
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-faq .faq-tagbar .tag:hover,
.page-faq .faq-tagbar .tag:focus-visible {
  color: var(--white);
  border-color: var(--grass);
}

.page-faq .faq-tagbar .tag.is-active {
  border-color: var(--signal);
  color: var(--white);
}

.page-faq .faq-tag__n {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.7rem;
  color: var(--amber);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 6rem;
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-faq .faq-group + .faq-group {
  padding-top: clamp(2rem, 5vw, 3.5rem);
  border-top: 1px solid var(--line);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: clamp(0.75rem, 2vw, 1.25rem);
  margin-bottom: 1.25rem;
}

.page-faq .faq-group__num {
  flex: 0 0 auto;
  font-family: var(--narrow);
  font-weight: 800;
  font-size: clamp(2.1rem, 6vw, 3.4rem);
  line-height: 0.8;
  letter-spacing: 0.01em;
  color: var(--signal);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-faq .faq-group__meta {
  margin: 0.4rem 0 0;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--cold);
}

@keyframes faq-title-flash {
  0% { color: var(--amber); }
  70% { color: var(--amber); }
  100% { color: var(--white); }
}

.page-faq .faq-group:target .faq-group__title {
  animation: faq-title-flash 1.6s var(--ease) forwards;
}

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

.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
  background-color: transparent;
  transition: background-color 220ms var(--ease);
}

.page-faq .faq-item[open] {
  background-color: var(--field);
}

.page-faq .faq-item > summary {
  position: relative;
  display: block;
  padding: 1rem 2.75rem 1rem 1.1rem;
  list-style: none;
  cursor: pointer;
  font-size: 0.9875rem;
  font-weight: 500;
  line-height: 1.65;
  color: var(--white);
  transition: color 200ms var(--ease);
}

.page-faq .faq-item > summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item > summary::marker {
  content: "";
}

.page-faq .faq-item > summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background-color: transparent;
  transition: background-color 240ms var(--ease);
}

.page-faq .faq-item > summary::after {
  content: "+";
  position: absolute;
  right: 0.9rem;
  top: 1.05rem;
  font-family: var(--mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--cold);
  transition: color 200ms var(--ease);
}

.page-faq .faq-item[open] > summary::before {
  background-color: var(--signal);
}

.page-faq .faq-item[open] > summary::after {
  content: "\2212";
  color: var(--signal);
}

.page-faq .faq-item > summary:hover {
  color: var(--amber);
}

.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: -2px;
}

.page-faq .faq-body {
  padding: 0 2.6rem 1.35rem 1.1rem;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--cold);
}

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

.page-faq .faq-body a {
  color: var(--amber);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-body a:hover,
.page-faq .faq-body a:focus-visible {
  color: var(--white);
}

/* ---------- 页尾反馈引导 ---------- */
.page-faq .faq-support {
  margin-top: clamp(3rem, 8vw, 6rem);
  padding-top: clamp(2rem, 5vw, 3.5rem);
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-faq .faq-support__eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--grass);
}

.page-faq .faq-support__title {
  margin: 0 0 1rem;
  max-width: 24ch;
  font-family: var(--narrow);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2.25rem);
  line-height: 1.18;
  color: var(--white);
}

.page-faq .faq-support__lead {
  margin: 0 0 1.5rem;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--cold);
}

.page-faq .faq-channels {
  display: grid;
  gap: 0;
  margin: 0 0 1.25rem;
  border-top: 1px solid var(--line);
}

.page-faq .faq-channels__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.3rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-channels__k {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cold);
}

.page-faq .faq-channels__v {
  font-size: 0.975rem;
  font-weight: 500;
  color: var(--white);
  word-break: break-word;
}

.page-faq .faq-support__note {
  margin: 0 0 1.5rem;
  max-width: 58ch;
  font-size: 0.85rem;
  line-height: 1.7;
}

.page-faq .faq-support__cta {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 700;
  text-decoration: none;
}

.page-faq .faq-support__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  background-color: var(--field);
}

.page-faq .faq-support__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.85);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-channels__row {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
  }

  .page-faq .faq-item > summary {
    padding: 1.15rem 3rem 1.15rem 1.35rem;
    font-size: 1.0625rem;
  }

  .page-faq .faq-body {
    padding: 0 3rem 1.6rem 1.35rem;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-body-grid {
    display: grid;
    grid-template-columns: minmax(208px, 256px) minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 5rem);
    align-items: start;
    padding-top: clamp(2.5rem, 4vw, 4rem);
  }

  .page-faq .faq-index {
    position: sticky;
    top: 5.5rem;
    margin-bottom: 0;
  }

  .page-faq .faq-index__nav {
    display: block;
  }

  .page-faq .faq-tagbar {
    display: none;
  }

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

  .page-faq .faq-support {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-group:target .faq-group__title {
    animation: none;
    color: var(--amber);
  }

  .page-faq .faq-item,
  .page-faq .faq-item > summary,
  .page-faq .faq-item > summary::before,
  .page-faq .faq-item > summary::after,
  .page-faq .faq-index__link,
  .page-faq .faq-tagbar .tag {
    transition: none;
  }
}