.page-faq {
  background-color: var(--ink-900);
  color: var(--body-ink);
}

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

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line-green);
  background-color: var(--ink-800);
  background-image:
    radial-gradient(110% 90% at 8% -20%, rgba(198, 255, 61, 0.16), transparent 58%),
    radial-gradient(90% 70% at 100% 0%, rgba(255, 122, 47, 0.10), transparent 60%),
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
  padding: clamp(1.75rem, 5vw, 3.75rem) 0 clamp(1.5rem, 4vw, 2.75rem);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: -6%;
  right: -6%;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--signal), transparent);
  transform: rotate(-1.2deg);
  opacity: 0.55;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__title {
  margin: 0.7rem 0 0;
  max-width: 22ch;
  font-family: var(--sans);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  font-size: clamp(1.85rem, 6vw, 3.4rem);
  color: var(--chalk);
}

.page-faq .faq-hero__lede {
  margin: 1rem 0 0;
  max-width: 44ch;
  color: var(--chalk-dim);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1.1rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.88rem;
  color: var(--chalk-dim);
}

.page-faq .faq-hero__facts li {
  position: relative;
  padding-left: 1.05rem;
  line-height: 1.5;
}

.page-faq .faq-hero__facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 0.48rem;
  height: 0.48rem;
  background-color: var(--signal);
  transform: rotate(45deg);
}

/* ---------- 主体布局 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.35rem, 4vw, 2.75rem);
  padding: clamp(1.5rem, 4.5vw, 3rem) 0 clamp(2.5rem, 6vw, 4.5rem);
}

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

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

/* ---------- 左侧问题索引 ---------- */

.page-faq .faq-index {
  border: 1px solid var(--line-green);
  background-color: var(--ink-800);
  background-image: linear-gradient(180deg, rgba(198, 255, 61, 0.07), transparent 45%);
  padding: 0.85rem 0.85rem 0.95rem;
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-faq .faq-index__head {
  margin: 0 0 0.6rem;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.2rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-faq .faq-index__item {
  flex: none;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  white-space: nowrap;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line-green);
  background-color: rgba(6, 26, 20, 0.55);
  color: var(--chalk-dim);
  font-size: 0.88rem;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--signal);
  border-color: var(--signal);
  background-color: rgba(198, 255, 61, 0.08);
  outline: none;
}

.page-faq .faq-index__link:focus-visible {
  box-shadow: 0 0 0 2px var(--signal);
}

.page-faq .faq-index__num {
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-faq .faq-index__link:hover .faq-index__num,
.page-faq .faq-index__link:focus-visible .faq-index__num {
  color: var(--glow);
}

/* ---------- 搜索过滤 ---------- */

.page-faq .faq-search {
  display: grid;
  gap: 0.45rem;
  margin-bottom: clamp(1.5rem, 3.5vw, 2.25rem);
  padding: 0.95rem 1rem 1rem;
  border: 1px solid var(--line-green);
  border-left: 3px solid var(--signal);
  background-color: var(--charcoal);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-faq .faq-search__label {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-faq .faq-search__input {
  width: 100%;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--line-green);
  background-color: var(--ink-900);
  color: var(--chalk);
  font-family: var(--mono);
  font-size: 0.9rem;
  line-height: 1.4;
  outline: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.page-faq .faq-search__input::placeholder {
  color: rgba(169, 184, 174, 0.7);
}

.page-faq .faq-search__input:focus {
  border-color: var(--signal);
  box-shadow: 0 0 0 2px rgba(198, 255, 61, 0.35);
}

.page-faq .faq-search__hint {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--chalk-dim);
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  position: relative;
  padding-bottom: clamp(1.6rem, 4vw, 2.5rem);
  margin-bottom: clamp(1.6rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--line-green);
  scroll-margin-top: 7.5rem;
}

.page-faq .faq-group:last-of-type {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-faq .faq-group::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 4.5rem;
  height: 3px;
  background-color: var(--signal);
  transform: rotate(-1.6deg);
  transform-origin: left center;
}

.page-faq .faq-group:last-of-type::after {
  display: none;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.5rem;
}

.page-faq .faq-group__num {
  flex: none;
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  background-color: var(--signal);
  color: var(--ink-900);
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: background-color 0.25s ease;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--sans);
  font-weight: 900;
  letter-spacing: -0.01em;
  font-size: clamp(1.28rem, 3.4vw, 1.7rem);
  line-height: 1.25;
  color: var(--chalk);
  transition: color 0.25s ease;
}

.page-faq .faq-group:target .faq-group__title {
  color: var(--glow);
}

.page-faq .faq-group:target .faq-group__num {
  background-color: var(--glow);
}

.page-faq .faq-group__note {
  margin: 0 0 1.15rem;
  max-width: 46ch;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--chalk-dim);
}

.page-faq .faq-group__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-faq .faq-group__media {
  margin: 0 0 1.15rem;
}

.page-faq .faq-group__media .media-frame__cap {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--chalk-dim);
}

/* ---------- 折叠条目 ---------- */

.page-faq .faq-item {
  margin-bottom: 0.55rem;
  border: 1px solid var(--line-green);
  background-color: var(--ink-800);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-faq .faq-item:last-child {
  margin-bottom: 0;
}

.page-faq .faq-item[open] {
  border-color: var(--signal);
  background-color: var(--ink-700);
}

.page-faq .faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.85rem 1rem;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.97rem;
  line-height: 1.55;
  color: var(--chalk);
  transition: color 0.18s 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: "+";
  flex: none;
  width: 1.05rem;
  font-family: var(--mono);
  font-weight: 700;
  color: var(--signal);
  line-height: 1.55;
}

.page-faq .faq-item[open] summary::before {
  content: "−";
  color: var(--glow);
}

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

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

.page-faq .faq-item__body {
  padding: 0 1rem 1rem 2.65rem;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--body-ink);
}

.page-faq .faq-item__body p {
  margin: 0 0 0.6rem;
  max-width: 42ch;
}

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

.page-faq .faq-link {
  display: inline-block;
  color: var(--signal);
  text-decoration: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1px;
  transition: background-size 0.18s ease, color 0.18s ease;
}

.page-faq .faq-link:hover,
.page-faq .faq-link:focus-visible {
  color: var(--glow);
  background-size: 100% 1px;
  outline: none;
}

.page-faq .faq-link:focus-visible {
  box-shadow: 0 0 0 2px var(--signal);
}

/* ---------- 收尾 ---------- */

.page-faq .faq-outro {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem 1.25rem;
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
  padding: 1.1rem 1.15rem;
  border: 1px solid var(--line-green);
  border-left: 3px solid var(--amber);
  background-color: var(--charcoal);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-faq .faq-outro__text {
  flex: 1 1 18rem;
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--chalk-dim);
}

/* ---------- 平板与桌面 ---------- */

@media (min-width: 46rem) {
  .page-faq .faq-group--split .faq-group__body {
    grid-template-columns: minmax(0, 1fr) 13rem;
    align-items: start;
    gap: 1.5rem;
  }

  .page-faq .faq-group--split .faq-group__media {
    margin: 0;
  }
}

@media (min-width: 62rem) {
  .page-faq .faq-layout {
    grid-template-columns: 15.5rem minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-side {
    position: sticky;
    top: 7rem;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 0.25rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index__item {
    flex: initial;
  }

  .page-faq .faq-index__link {
    white-space: normal;
    padding: 0.5rem 0.6rem;
    font-size: 0.92rem;
  }

  .page-faq .faq-group--split .faq-group__body {
    grid-template-columns: minmax(0, 1fr) 15rem;
  }
}

@media (min-width: 84rem) {
  .page-faq .faq-group--split .faq-group__body {
    grid-template-columns: minmax(0, 1fr) 17rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-index__link,
  .page-faq .faq-search__input,
  .page-faq .faq-link,
  .page-faq .faq-group__num,
  .page-faq .faq-group__title {
    transition: none;
  }
}