.page-faq {
  --faq-card: #fffdf8;
  --faq-line: rgba(33, 26, 23, 0.13);
  --faq-line-strong: rgba(33, 26, 23, 0.24);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(5rem, 10vw, 8rem);
  color: var(--paper);
  background:
    radial-gradient(115% 85% at 88% -10%, rgba(123, 108, 246, 0.34), transparent 62%),
    radial-gradient(90% 70% at 4% 105%, rgba(95, 224, 208, 0.2), transparent 58%),
    linear-gradient(158deg, var(--polar) 0%, var(--night) 58%, var(--polar) 100%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(95, 224, 208, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(95, 224, 208, 0.07) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(90% 75% at 55% 25%, #000 15%, transparent 80%);
  mask-image: radial-gradient(90% 75% at 55% 25%, #000 15%, transparent 80%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: clamp(2rem, 5vw, 4rem);
  background: var(--paper);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  pointer-events: none;
}

.page-faq .faq-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero .crumbs__link,
.page-faq .faq-hero .crumbs__sep,
.page-faq .faq-hero .crumbs__item {
  color: rgba(247, 243, 234, 0.68);
}

.page-faq .faq-hero .crumbs__link:hover,
.page-faq .faq-hero .crumbs__link:focus-visible {
  color: var(--ice);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

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

.page-faq .faq-hero .eyebrow {
  color: var(--ice);
}

.page-faq .faq-hero__title {
  margin: 0.7rem 0 0;
  font-size: clamp(2rem, 5.4vw, 3.5rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: 0.035em;
  color: var(--paper);
}

.page-faq .faq-hero__lead {
  max-width: 44ch;
  margin: 1.1rem 0 0;
  font-size: clamp(1rem, 1.5vw, 1.0625rem);
  line-height: 1.85;
  color: rgba(247, 243, 234, 0.82);
}

.page-faq .faq-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__chips li {
  padding: 0.35rem 0.65rem;
  border: 1px solid rgba(95, 224, 208, 0.36);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--ice);
}

.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  min-width: 0;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid rgba(95, 224, 208, 0.32);
}

/* ---------- 主体容器 ---------- */
.page-faq .faq-main {
  padding-top: 0;
  padding-bottom: clamp(3rem, 6vw, 5rem);
}

/* ---------- 快速跳转条 ---------- */
.page-faq .faq-jump {
  overflow-x: auto;
  padding: 0.7rem 0;
  border-top: 1px solid var(--faq-line);
  border-bottom: 1px solid var(--faq-line);
  scrollbar-width: thin;
}

.page-faq .faq-jump__list {
  display: flex;
  gap: 0.4rem 1.6rem;
  min-width: max-content;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-jump a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.3rem 0.1rem;
  border-bottom: 2px solid transparent;
  color: var(--ink);
  font-size: 0.9375rem;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  color: var(--polar);
  border-bottom-color: var(--signal);
}

.page-faq .faq-jump__n {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--signal);
}

/* ---------- 热门问题速览 ---------- */
.page-faq .faq-quick {
  margin-top: clamp(2rem, 4vw, 3rem);
  padding: clamp(1.5rem, 4vw, 2.75rem);
  color: var(--paper);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(123, 108, 246, 0.28), transparent 60%),
    linear-gradient(150deg, var(--polar), var(--night));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 1.75rem), calc(100% - 1.75rem) 100%, 0 100%);
}

.page-faq .faq-quick .eyebrow {
  color: var(--ice);
}

.page-faq .faq-quick__head h2 {
  margin: 0.5rem 0 0;
  font-size: clamp(1.25rem, 2.6vw, 1.75rem);
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-faq .faq-quick__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.875rem;
  margin-top: 1.5rem;
}

.page-faq .faq-quick__card {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1rem 1.15rem 1.15rem;
  background: rgba(247, 243, 234, 0.06);
  border: 1px solid rgba(95, 224, 208, 0.22);
  color: inherit;
  text-decoration: none;
  transition: background 0.22s var(--ease), border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-faq .faq-quick__card:hover,
.page-faq .faq-quick__card:focus-visible {
  background: rgba(247, 243, 234, 0.12);
  border-color: var(--ice);
  transform: translateY(-4px);
}

.page-faq .faq-quick__tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-faq .faq-quick__q {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-faq .faq-quick__a {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(247, 243, 234, 0.76);
}

/* ---------- 索引 + 问答布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: clamp(2rem, 4vw, 3rem);
}

.page-faq .faq-index__label {
  margin: 0 0 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  margin: 0;
  padding: 0 0 0.6rem;
  list-style: none;
  scrollbar-width: thin;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  flex: 0 0 auto;
  white-space: nowrap;
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--faq-line);
  background: var(--faq-card);
  color: var(--ink);
  font-size: 0.875rem;
  text-decoration: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .faq-index__link span {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--signal);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-color: var(--ice);
  color: var(--polar);
}

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

.page-faq .faq-group {
  scroll-margin-top: 7.5rem;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(2.5rem, 5vw, 3.75rem);
}

.page-faq .faq-group__head {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--faq-line-strong);
}

.page-faq .faq-group__head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 3.5rem;
  height: 2px;
  background: var(--signal);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--signal);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(1.2rem, 2.4vw, 1.5rem);
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--polar);
}

.page-faq .faq-group__intro {
  max-width: 60ch;
  margin: 0.85rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink);
}

.page-faq .faq-group__intro a,
.page-faq .faq-item__body a {
  color: var(--polar);
  text-decoration: underline;
  text-decoration-color: var(--ice);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-faq .faq-group__intro a:hover,
.page-faq .faq-item__body a:hover {
  color: var(--glacier);
}

.page-faq .faq-list {
  display: grid;
  gap: 0.625rem;
  margin-top: 1.25rem;
}

.page-faq .faq-item {
  background: var(--faq-card);
  border: 1px solid var(--faq-line);
  border-left: 3px solid var(--faq-line);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-faq .faq-item:hover {
  border-color: var(--faq-line-strong);
  border-left-color: var(--faq-line-strong);
}

.page-faq .faq-item[open] {
  border-left-color: var(--ice);
  box-shadow: 0 14px 30px -24px rgba(10, 27, 51, 0.75);
}

.page-faq .faq-item__summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
}

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

.page-faq .faq-item__summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: -2px;
}

.page-faq .faq-item__mark {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin-top: 0.35rem;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  background: var(--signal);
  transform: translateY(-50%);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.page-faq .faq-item__mark::after {
  transform: translateY(-50%) rotate(90deg);
}

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

.page-faq .faq-item__body {
  max-width: 62ch;
  padding: 0 1.1rem 1.15rem;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(33, 26, 23, 0.82);
}

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

.page-faq .faq-item__body p + p {
  margin-top: 0.7rem;
}

/* ---------- 联系支持 ---------- */
.page-faq .faq-support {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: clamp(3rem, 6vw, 5rem);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  color: var(--paper);
  background:
    radial-gradient(100% 130% at 0% 100%, rgba(95, 224, 208, 0.16), transparent 62%),
    linear-gradient(135deg, var(--night), var(--polar));
  clip-path: polygon(1.75rem 0, 100% 0, 100% 100%, 0 100%, 0 1.75rem);
  scroll-margin-top: 7.5rem;
}

.page-faq .faq-support .eyebrow {
  color: var(--ice);
}

.page-faq .faq-support__title {
  margin: 0.5rem 0 0;
  font-size: clamp(1.25rem, 2.6vw, 1.7rem);
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-faq .faq-support__text {
  max-width: 42ch;
  margin: 0.9rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(247, 243, 234, 0.8);
}

.page-faq .faq-support__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.85rem;
  margin-top: 1.35rem;
}

.page-faq .faq-support__key {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-support__mail {
  display: inline-block;
  padding: 0.35rem 0.65rem;
  border: 1px solid rgba(95, 224, 208, 0.3);
  background: rgba(95, 224, 208, 0.1);
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--ice);
  word-break: break-all;
}

.page-faq .faq-support__btn {
  margin-top: 1.5rem;
}

.page-faq .faq-support__fig {
  margin: 0;
  min-width: 0;
}

.page-faq .faq-support__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border: 1px solid rgba(95, 224, 208, 0.28);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-quick__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-faq .faq-layout {
    grid-template-columns: 14.5rem minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    margin-top: clamp(2.5rem, 4vw, 3.5rem);
  }

  .page-faq .faq-index {
    position: sticky;
    top: 7.5rem;
    align-self: start;
  }

  .page-faq .faq-index__label {
    margin-bottom: 0.75rem;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 0;
    padding-bottom: 0;
    border-left: 1px solid var(--faq-line);
  }

  .page-faq .faq-index__link {
    width: 100%;
    margin-left: -1px;
    padding: 0.6rem 0 0.6rem 1rem;
    border: 0;
    border-left: 2px solid transparent;
    background: none;
    white-space: normal;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    border-left-color: var(--signal);
    background: rgba(95, 224, 208, 0.14);
    color: var(--polar);
  }
}

@media (min-width: 880px) {
  .page-faq .faq-support {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: center;
    gap: clamp(2rem, 4vw, 3.25rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-jump a,
  .page-faq .faq-quick__card,
  .page-faq .faq-index__link,
  .page-faq .faq-item,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after {
    transition: none;
  }

  .page-faq .faq-quick__card:hover,
  .page-faq .faq-quick__card:focus-visible {
    transform: none;
  }
}