.page-faq {
  --faq-ink-line: rgba(243, 238, 226, .16);
  --faq-paper-line: rgba(33, 28, 21, .14);
  background: var(--cream-100);
  color: var(--brown-900);
  font-family: var(--font-body);
  overflow-wrap: break-word;
}

.page-faq h1,
.page-faq h2,
.page-faq h3 {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}

.page-faq img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-faq .faq-group,
.page-faq .faq-glossary,
.page-faq .faq-submit {
  scroll-margin-top: calc(var(--header-h) + 64px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 36px) 0 0;
  background:
    radial-gradient(120% 90% at 84% 4%, rgba(63, 224, 201, .16), transparent 62%),
    linear-gradient(170deg, var(--ink-900) 0%, var(--ink-700) 100%);
  color: var(--cream-100);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-ink) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-ink) 1px, transparent 1px);
  background-size: 46px 46px;
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  padding-bottom: 36px;
}

.page-faq .faq-hero .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
}

.page-faq .faq-hero .breadcrumbs__link {
  color: var(--cyan-200);
  text-decoration: none;
}

.page-faq .faq-hero .breadcrumbs__link:hover {
  color: var(--cyan-400);
}

.page-faq .faq-hero .breadcrumbs__current {
  color: var(--sage-500);
}

.page-faq .faq-hero__tag {
  margin: 0 0 10px;
  color: var(--cyan-400);
}

.page-faq .faq-hero__title {
  margin: 0;
  max-width: 20em;
  font-size: clamp(28px, 6.6vw, 50px);
  font-weight: 700;
  line-height: 1.16;
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(243, 238, 226, .82);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 34px;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px dashed var(--hair-ink);
  list-style: none;
}

.page-faq .faq-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-faq .faq-fact__num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
}

.page-faq .faq-fact__unit {
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan-200);
}

.page-faq .faq-fact__label {
  font-size: 13px;
  color: rgba(243, 238, 226, .72);
}

.page-faq .faq-cycle {
  display: block;
  width: 100%;
  max-width: 340px;
  margin: 26px 0 0;
}

.page-faq .faq-cycle__axis {
  stroke: var(--hair-ink);
  stroke-width: 1.5;
}

.page-faq .faq-cycle__ticks line {
  stroke: var(--cyan-400);
  stroke-width: 1.5;
  opacity: .55;
}

.page-faq .faq-cycle__mark {
  fill: var(--amber-500);
}

.page-faq .faq-cycle__cap {
  fill: rgba(168, 243, 230, .8);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
}

.page-faq .faq-hero__media {
  margin: 30px 0 0;
}

.page-faq .faq-hero__media img {
  width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

/* ---------- 主题索引条 ---------- */
.page-faq .faq-rail {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  background: rgba(6, 35, 29, .95);
  border-top: 1px solid var(--hair-ink);
  border-bottom: 1px solid var(--hair-ink);
  backdrop-filter: blur(8px);
}

.page-faq .faq-rail__inner {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.page-faq .faq-rail__label {
  flex: 0 0 auto;
  color: var(--sage-500);
  font-size: 11px;
}

.page-faq .faq-rail__list {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  padding: 2px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-faq .faq-rail__item {
  flex: 0 0 auto;
}

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 11px;
  border: 1px solid rgba(63, 224, 201, .26);
  color: var(--cyan-200);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 160ms var(--ease), color 160ms var(--ease);
}

.page-faq .faq-rail__link:hover {
  background: rgba(63, 224, 201, .14);
  color: var(--cyan-400);
}

.page-faq .faq-rail__link:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--cyan-400);
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: 32px;
  padding-top: 34px;
  padding-bottom: 54px;
}

.page-faq .faq-group {
  --group-tag: var(--ink-900);
  margin: 0 0 24px;
  padding: 4px 16px 10px;
  background: rgba(255, 255, 255, .42);
  border-left: 3px solid var(--group-tag);
}

.page-faq .faq-group--mid {
  --group-tag: var(--ink-700);
}

.page-faq .faq-group--slate {
  --group-tag: var(--slate-400);
}

.page-faq .faq-group--sage {
  --group-tag: var(--sage-500);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 0 13px;
  border-bottom: 1px solid var(--faq-paper-line);
}

.page-faq .faq-group__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--group-tag);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(19px, 4.6vw, 22px);
  font-weight: 700;
}

.page-faq .faq-group__desc {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--slate-400);
}

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

.page-faq .faq-item:first-child {
  border-top: 0;
}

.page-faq .faq-item__q {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 15.5px;
  line-height: 1.6;
}

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

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

.page-faq .faq-item__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--slate-400);
}

.page-faq .faq-item__label {
  flex: 1 1 auto;
}

.page-faq .faq-item__icon {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  transform: translateY(2px);
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--group-tag, var(--ink-700));
  transition: transform 220ms var(--ease), opacity 220ms var(--ease);
}

.page-faq .faq-item__icon::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-faq .faq-item__icon::after {
  top: 0;
  left: 7px;
  width: 2px;
  height: 16px;
}

.page-faq .faq-item[open] .faq-item__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-item__body {
  padding: 0 0 18px;
}

.page-faq .faq-item__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--brown-900);
  max-width: 40em;
}

.page-faq .faq-item[open] .faq-item__body {
  animation: faq-body-in 220ms var(--ease);
}

@keyframes faq-body-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 侧栏 ---------- */
.page-faq .faq-aside {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-faq .faq-card {
  padding: 18px;
  border: 1px solid var(--faq-paper-line);
  background: rgba(255, 255, 255, .38);
}

.page-faq .faq-card--ink {
  background: var(--ink-900);
  border-color: var(--hair-ink);
  color: var(--cream-100);
}

.page-faq .faq-card__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
}

.page-faq .faq-card__text {
  margin: 0 0 12px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--slate-400);
}

.page-faq .faq-card--ink .faq-card__text {
  color: rgba(243, 238, 226, .78);
}

.page-faq .faq-card__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-faq .faq-card__link {
  display: inline-block;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-700);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 224, 201, .55);
}

.page-faq .faq-card__link:hover {
  color: var(--amber-500);
  border-bottom-color: var(--amber-500);
}

.page-faq .faq-card--ink .faq-card__link {
  color: var(--cyan-200);
}

.page-faq .faq-card--ink .faq-card__link:hover {
  color: var(--cyan-400);
}

.page-faq .faq-contact {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--faq-paper-line);
  display: grid;
  gap: 9px;
}

.page-faq .faq-contact__row {
  display: grid;
  gap: 2px;
}

.page-faq .faq-contact__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--sage-500);
}

.page-faq .faq-contact__value {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
}

/* ---------- 术语索引带 ---------- */
.page-faq .faq-glossary {
  position: relative;
  padding: 46px 0 54px;
  background: var(--ink-900);
  color: var(--cream-100);
}

.page-faq .faq-glossary::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, var(--cyan-400) 0 2px, transparent 2px 14px);
  opacity: .45;
}

.page-faq .faq-glossary__head {
  max-width: 62em;
}

.page-faq .faq-glossary__head .label-mono {
  color: var(--cyan-400);
}

.page-faq .faq-glossary__title {
  margin: 10px 0 0;
  font-size: clamp(22px, 5vw, 30px);
  font-weight: 700;
}

.page-faq .faq-glossary__note {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(243, 238, 226, .74);
}

.page-faq .faq-glossary__letters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-glossary__letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--hair-ink);
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(168, 243, 230, .6);
}

.page-faq .faq-glossary__letter--on {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  color: var(--ink-900);
  font-weight: 700;
}

.page-faq .faq-glossary__terms {
  display: grid;
  gap: 1px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  background: var(--hair-ink);
  border: 1px solid var(--hair-ink);
}

.page-faq .faq-term {
  background: var(--ink-900);
  padding: 14px 16px;
}

.page-faq .faq-term__code {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--amber-500);
}

.page-faq .faq-term__name {
  display: block;
  margin-top: 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
}

.page-faq .faq-term__def {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(243, 238, 226, .74);
}

/* ---------- 提交与回复 ---------- */
.page-faq .faq-submit {
  padding: 44px 0 62px;
}

.page-faq .faq-submit__grid {
  display: grid;
  gap: 30px;
}

.page-faq .faq-submit__main .label-mono {
  color: var(--slate-400);
}

.page-faq .faq-submit__title {
  margin: 10px 0 0;
  font-size: clamp(22px, 5vw, 30px);
  font-weight: 700;
}

.page-faq .faq-submit__lead {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--slate-400);
  max-width: 44em;
}

.page-faq .faq-steps {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-faq .faq-step {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--faq-paper-line);
}

.page-faq .faq-step__num {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--amber-500);
}

.page-faq .faq-step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
}

.page-faq .faq-submit__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 0;
}

.page-faq .faq-submit__media {
  margin: 0;
}

.page-faq .faq-submit__media img {
  width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-faq .faq-submit__media figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--slate-400);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-item__body {
    padding-left: 34px;
  }

  .page-faq .faq-group {
    padding: 4px 22px 12px;
  }

  .page-faq .faq-fact__num {
    font-size: 34px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-submit__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-faq .faq-glossary__terms {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-hero__inner {
    padding-bottom: 44px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 44px;
    align-items: start;
    padding-top: 48px;
    padding-bottom: 72px;
  }

  .page-faq .faq-aside {
    position: sticky;
    top: calc(var(--header-h) + 76px);
  }
}

@media (min-width: 1120px) {
  .page-faq .faq-glossary__terms {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

  .page-faq .faq-rail__link,
  .page-faq .faq-item__icon::before,
  .page-faq .faq-item__icon::after {
    transition: none;
  }
}