.page-faq {
  --faq-gap: 20px;
  --faq-line: 1px solid var(--ink-700);
}

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: calc(var(--bar-h) + 40px) 56px;
  background:
    radial-gradient(120% 80% at 82% 8%, rgba(53, 231, 224, 0.14), transparent 62%),
    linear-gradient(168deg, var(--ink-850), var(--ink-950) 72%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: auto -8% -30% -8%;
  height: 62%;
  background: linear-gradient(115deg, rgba(15, 163, 107, 0.22), rgba(15, 163, 107, 0.02) 68%);
  clip-path: polygon(0 46%, 100% 4%, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
}

.page-faq .faq-hero__copy .breadcrumbs {
  margin-bottom: 22px;
}

.page-faq .faq-hero__copy .display-title {
  margin-top: 12px;
  font-size: clamp(34px, 6.4vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-faq .faq-hero__copy .lede {
  margin-top: 20px;
  max-width: 34em;
  color: var(--text-300);
  font-size: 16px;
  line-height: 1.75;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-faq .faq-hero__media .media-frame {
  border-radius: var(--radius-lg);
  border: 1px solid var(--ink-700);
}

.page-faq .faq-body {
  padding-block: 56px 64px;
}

.page-faq .faq-layout {
  display: grid;
  gap: 32px;
}

/* 左侧分类索引 */
.page-faq .faq-index {
  border: var(--faq-line);
  border-radius: var(--radius-md);
  background: var(--ink-850);
  padding: 20px 18px;
}

.page-faq .faq-index__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-400);
  font-family: var(--font-mono);
}

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

.page-faq .faq-index__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 10px 9px 12px;
  border-radius: var(--radius-pill);
  border-left: 2px solid transparent;
  color: var(--text-100);
  text-decoration: none;
  font-size: 14px;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.page-faq .faq-index__link .mono {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-300);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  background: rgba(15, 163, 107, 0.16);
  border-left-color: var(--cyan-400);
}

.page-faq .faq-index__link:hover .mono,
.page-faq .faq-index__link:focus-visible .mono {
  color: var(--track-400);
}

.page-faq .faq-index__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: var(--faq-line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-300);
}

/* 问答分组 */
.page-faq .faq-groups {
  display: grid;
  gap: 52px;
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--bar-h) + 24px);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  column-gap: 14px;
  row-gap: 6px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--track-600);
  margin-bottom: 8px;
}

.page-faq .faq-group__index {
  font-size: 13px;
  color: var(--track-400);
  letter-spacing: 0.1em;
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(21px, 3.4vw, 28px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-100);
}

.page-faq .faq-group__desc {
  grid-column: 2 / -1;
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-300);
}

.page-faq .faq-group__list {
  padding-left: 16px;
  display: grid;
}

/* 折叠问答 */
.page-faq .faq-item {
  position: relative;
  border-bottom: var(--faq-line);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 12px;
  bottom: 12px;
  width: 3px;
  border-radius: var(--radius-pill);
  background: var(--track-600);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.page-faq .faq-item[open]::before {
  opacity: 1;
}

.page-faq .faq-item__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 4px 18px 2px;
  cursor: pointer;
  list-style: none;
  transition: color 0.18s ease;
}

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

.page-faq .faq-item__summary:hover .faq-item__q,
.page-faq .faq-item__summary:focus-visible .faq-item__q {
  color: var(--track-400);
}

.page-faq .faq-item__num {
  flex: none;
  width: 26px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-300);
}

.page-faq .faq-item__q {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--text-100);
  transition: color 0.18s ease;
}

.page-faq .faq-item__sign {
  flex: none;
  position: relative;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--ink-700);
  align-self: center;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 1.5px;
  background: var(--cyan-400);
  transform-origin: center;
  transition: transform 0.22s ease, opacity 0.22s ease;
}

.page-faq .faq-item__sign::before {
  transform: translate(-50%, -50%);
}

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

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

.page-faq .faq-item__body {
  padding: 0 4px 22px 42px;
  color: var(--text-300);
  font-size: 14.5px;
  line-height: 1.78;
}

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

.page-faq .faq-item__body a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-steps {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
  counter-reset: step;
}

.page-faq .faq-steps li {
  position: relative;
  padding-left: 22px;
  counter-increment: step;
}

.page-faq .faq-steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--track-400);
  letter-spacing: 0.04em;
}

.page-faq .faq-item:target .faq-item__summary {
  background: rgba(53, 231, 224, 0.07);
  border-radius: var(--radius-sm);
}

/* 术语速查 */
.page-faq .faq-group--terms .faq-terms__media {
  margin-top: 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--ink-700);
}

.page-faq .faq-terms__grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  margin-top: 22px;
}

.page-faq .term-card {
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, var(--ink-850), var(--ink-950));
  padding: 18px 16px 20px;
}

.page-faq .term-card__abbr {
  margin: 0 0 10px;
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(15, 163, 107, 0.18);
  color: var(--track-400);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.page-faq .term-card__name {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-100);
}

.page-faq .term-card__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--text-300);
}

.page-faq .faq-terms__foot {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan-400);
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-300);
}

.page-faq .faq-terms__foot a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 联系收尾 */
.page-faq .faq-contact {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--ink-700);
}

.page-faq .faq-contact::before {
  content: "";
  position: absolute;
  inset: 0 -10% auto auto;
  width: 52%;
  height: 100%;
  background: linear-gradient(215deg, rgba(255, 122, 47, 0.14), transparent 66%);
  clip-path: polygon(28% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-faq .faq-contact__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 32px;
}

.page-faq .faq-contact__title {
  margin: 10px 0 0;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--text-100);
}

.page-faq .faq-contact__desc {
  margin: 16px 0 24px;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-300);
}

.page-faq .faq-contact__list {
  display: grid;
  gap: 2px;
  grid-template-columns: 1fr;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--faq-line);
}

.page-faq .faq-contact__list .contact-item {
  display: grid;
  gap: 4px;
  padding: 14px 2px;
  border-bottom: var(--faq-line);
}

.page-faq .faq-contact__list .contact-label {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-400);
  font-family: var(--font-mono);
}

.page-faq .faq-contact__list .contact-value {
  font-size: 14.5px;
  color: var(--text-100);
  word-break: break-word;
}

.page-faq .faq-contact__foot {
  position: relative;
  z-index: 1;
  margin-top: 26px;
}

.page-faq .faq-contact__foot p {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-300);
}

.page-faq .faq-contact__foot a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (min-width: 560px) {
  .page-faq .faq-contact__list {
    grid-template-columns: 1fr 1fr;
    column-gap: 24px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding-block: calc(var(--bar-h) + 56px) 80px;
  }

  .page-faq .faq-hero__inner {
    grid-template-columns: 7fr 5fr;
    align-items: center;
    gap: 48px;
  }

  .page-faq .faq-hero__media {
    transform: translateY(-8px);
  }

  .page-faq .faq-body {
    padding-block: 72px 88px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 56px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
  }

  .page-faq .faq-contact__inner {
    grid-template-columns: 6fr 5fr;
    align-items: start;
    gap: 56px;
  }

  .page-faq .faq-contact__list {
    grid-template-columns: 1fr;
    border-top: 0;
    padding-top: 6px;
  }

  .page-faq .faq-contact__list .contact-item:first-child {
    border-top: var(--faq-line);
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-terms__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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