.page-faq {
  --faq-hair: rgba(10, 14, 12, 0.1);
  --faq-hair-strong: rgba(10, 14, 12, 0.22);
  --faq-hair-dark: rgba(244, 247, 244, 0.16);
  --faq-muted: rgba(10, 14, 12, 0.72);
  --faq-muted-dark: rgba(244, 247, 244, 0.72);
  display: block;
  background: var(--paper-050);
  color: var(--ink-900);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--paper-050);
  padding-top: clamp(20px, 3vw, 34px);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 56px));
}

.page-faq .faq-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-faq .faq-hero__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.35) contrast(1.08);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(112deg, rgba(10, 14, 12, 0.95) 0%, rgba(10, 14, 12, 0.78) 48%, rgba(10, 14, 12, 0.46) 100%),
    radial-gradient(circle at 84% 14%, rgba(2, 196, 107, 0.32), transparent 58%);
}

.page-faq .faq-hero__inner {
  padding-bottom: clamp(80px, 10vw, 118px);
}

.page-faq .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.page-faq .breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
}

.page-faq .breadcrumb li + li::before {
  content: "/";
  color: rgba(244, 247, 244, 0.32);
}

.page-faq .breadcrumb__link {
  color: rgba(244, 247, 244, 0.76);
  text-decoration: none;
}

.page-faq .breadcrumb__link:hover,
.page-faq .breadcrumb__link:focus-visible {
  color: var(--pitch-500);
}

.page-faq .breadcrumb__current {
  color: rgba(244, 247, 244, 0.5);
}

.page-faq .faq-hero .eyebrow {
  margin-top: clamp(28px, 4vw, 46px);
  color: var(--pitch-500);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2.05rem, 5.4vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 16px 0 0;
  max-width: 17ch;
}

.page-faq .faq-hero__lead {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.78;
  color: var(--faq-muted-dark);
}

.page-faq .faq-hero__stats {
  list-style: none;
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 14px clamp(24px, 4vw, 52px);
}

.page-faq .faq-hero__stats li {
  display: flex;
  align-items: baseline;
  gap: 9px;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: rgba(244, 247, 244, 0.66);
}

.page-faq .faq-hero__stats .mono {
  font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.02em;
  color: var(--pitch-500);
}

/* ---------- 分类索引 ---------- */
.page-faq .faq-index {
  padding: clamp(44px, 6vw, 78px) 0 clamp(20px, 3vw, 34px);
}

.page-faq .faq-index__grid {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-faq .faq-index__card a {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num name"
    "num desc"
    "count count";
  align-items: center;
  gap: 4px 12px;
  padding: 20px 22px;
  background: #ffffff;
  color: var(--ink-900);
  text-decoration: none;
  box-shadow: inset 3px 0 0 var(--pitch-500), inset 0 0 0 1px var(--faq-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease);
}

.page-faq .faq-index__card a:hover,
.page-faq .faq-index__card a:focus-visible {
  transform: translateY(-3px);
  box-shadow: inset 3px 0 0 var(--tech-600), inset 0 0 0 1px rgba(31, 107, 255, 0.28);
}

.page-faq .faq-index__num {
  grid-area: num;
  align-self: start;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--tile-400);
  letter-spacing: -0.02em;
}

.page-faq .faq-index__name {
  grid-area: name;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
}

.page-faq .faq-index__desc {
  grid-area: desc;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--faq-muted);
}

.page-faq .faq-index__count {
  grid-area: count;
  justify-self: start;
  margin-top: 10px;
  padding: 3px 9px;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--pitch-700);
  background: var(--pitch-tint);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 6px 100%, 0 calc(100% - 6px));
}

/* ---------- 双栏问答 ---------- */
.page-faq .faq-main {
  padding-bottom: clamp(44px, 6vw, 84px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.5vw, 52px);
}

.page-faq .faq-rail__title {
  margin: 0 0 10px;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--tile-400);
  text-transform: uppercase;
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-faq .faq-rail__list li {
  flex: 0 0 auto;
}

.page-faq .faq-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  white-space: nowrap;
  font-size: 0.875rem;
  color: var(--ink-900);
  text-decoration: none;
  border-bottom: 2px solid var(--faq-hair);
  transition: color 140ms var(--ease), border-color 140ms var(--ease);
}

.page-faq .faq-rail__list a .mono {
  font-size: 0.75rem;
  color: var(--tile-400);
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  color: var(--tech-700);
  border-bottom-color: var(--tech-600);
}

.page-faq .faq-group {
  padding-top: clamp(20px, 3vw, 30px);
  scroll-margin-top: 96px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(44px, 6vw, 76px);
}

.page-faq .faq-group__lead {
  margin: 14px 0 6px;
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--faq-muted);
}

.page-faq .faq-figure {
  margin: clamp(18px, 2.6vw, 26px) 0 10px;
}

/* ---------- 折叠条目 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 17px 2px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(0.9688rem, 1.4vw, 1.0625rem);
  line-height: 1.55;
  color: var(--ink-900);
  transition: color 140ms var(--ease);
}

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

.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible {
  color: var(--tech-700);
}

.page-faq .faq-item__icon {
  position: relative;
  flex: 0 0 auto;
  margin-left: auto;
  width: 22px;
  height: 22px;
  border: 1.5px solid var(--pitch-700);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
  transition: background 160ms var(--ease), transform 160ms var(--ease);
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 5px;
  right: 5px;
  height: 1.5px;
  background: var(--pitch-700);
  transform: translateY(-50%);
  transition: opacity 160ms var(--ease), background 160ms var(--ease);
}

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

.page-faq .faq-item[open] .faq-item__icon {
  background: var(--pitch-500);
  transform: rotate(45deg);
}

.page-faq .faq-item[open] .faq-item__icon::before,
.page-faq .faq-item[open] .faq-item__icon::after {
  background: var(--ink-900);
}

.page-faq .faq-item__a {
  padding: 0 clamp(20px, 5vw, 48px) 20px 2px;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--faq-muted);
  border-top: 1px solid transparent;
}

.page-faq .faq-item[open] .faq-item__a {
  border-top-color: var(--faq-hair);
  padding-top: 14px;
  animation: faq-answer-in 260ms var(--ease) both;
}

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

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

@keyframes faq-answer-in {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 联系条目 ---------- */
.page-faq .faq-contact {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 18px 20px;
  display: grid;
  gap: 14px;
  background: var(--tech-tint);
  box-shadow: inset 0 0 0 1px rgba(31, 107, 255, 0.16);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-faq .faq-contact .contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  align-items: baseline;
}

.page-faq .faq-contact .contact-row__label {
  flex: 0 0 96px;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--tech-700);
}

.page-faq .faq-contact .contact-row__body {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.page-faq .faq-contact .contact-row__value {
  font-size: 0.9375rem;
  color: var(--ink-900);
  overflow-wrap: anywhere;
}

/* ---------- 收尾 ---------- */
.page-faq .faq-next {
  background: var(--ink-900);
  color: var(--paper-050);
  padding: clamp(64px, 8vw, 104px) 0 clamp(52px, 7vw, 88px);
  clip-path: polygon(0 34px, 100% 0, 100% 100%, 0 100%);
}

.page-faq .faq-next__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: clamp(24px, 4vw, 48px);
}

.page-faq .faq-next__text {
  flex: 1 1 340px;
  max-width: 62ch;
}

.page-faq .faq-next .eyebrow {
  color: var(--pitch-500);
  margin: 0;
}

.page-faq .faq-next h2 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 12px 0 0;
}

.page-faq .faq-next__text p {
  margin: 16px 0 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--faq-muted-dark);
}

.page-faq .faq-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-index__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-index__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 1px;
    overflow: visible;
  }

  .page-faq .faq-rail__list li {
    flex: 1 1 auto;
  }

  .page-faq .faq-rail__list a {
    padding: 10px 12px;
    border-bottom: none;
    border-left: 2px solid var(--faq-hair);
  }

  .page-faq .faq-rail__list a:hover,
  .page-faq .faq-rail__list a:focus-visible {
    border-left-color: var(--tech-600);
    border-bottom-color: transparent;
  }

  .page-faq .faq-figure {
    max-width: 680px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__a,
  .page-faq .faq-item[open] .faq-item__a {
    animation: none;
  }

  .page-faq .faq-index__card a,
  .page-faq .faq-item__icon,
  .page-faq .faq-item__q,
  .page-faq .faq-rail__list a {
    transition: none;
  }

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