.page-faq {
  --faq-rail-w: 208px;
  --faq-gutter: clamp(1.5rem, 4vw, 3.25rem);
}

/* ============ 首屏 ============ */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.75rem, 4.5vw, 3rem) clamp(3.5rem, 8vw, 6.25rem);
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(61, 224, 200, 0.16), transparent 58%),
    radial-gradient(90% 80% at 4% 100%, rgba(224, 169, 58, 0.14), transparent 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--snow);
}

.page-faq .faq-hero__texture {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(115deg, rgba(199, 210, 224, 0.055) 0 1px, transparent 1px 22px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 84%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 84%);
}

.page-faq .faq-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 5vw, 3rem);
  align-items: center;
}

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

.page-faq .faq-hero .ub-crumbs {
  color: var(--frost);
  margin: 0 0 1.15rem;
}

.page-faq .faq-hero .ub-crumbs a {
  color: var(--frost);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-hero .ub-crumbs a:hover,
.page-faq .faq-hero .ub-crumbs a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
  outline: none;
}

.page-faq .faq-hero .ub-crumbs__current {
  color: var(--snow);
}

.page-faq .faq-hero .ub-kicker {
  color: var(--cyan);
  letter-spacing: 0.2em;
  margin: 0;
}

.page-faq .faq-hero .ub-h1 {
  font-weight: 300;
  font-size: clamp(1.85rem, 5.1vw, 3.15rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 0.6rem 0 1.1rem;
  max-width: 22ch;
}

.page-faq .faq-hero .ub-lead {
  color: var(--frost);
  font-size: clamp(1rem, 1.6vw, 1.06rem);
  line-height: 1.8;
  max-width: 48ch;
  margin: 0;
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem 2.25rem;
  margin: 1.85rem 0 0;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
}

.page-faq .faq-hero__facts > div {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.page-faq .faq-hero__facts dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--frost);
  opacity: 0.8;
}

.page-faq .faq-hero__facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--snow);
  letter-spacing: 0.02em;
}

.page-faq .faq-hero__media {
  margin: 0;
  background: var(--panel);
  clip-path: var(--cut-panel);
  overflow: hidden;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ============ 主体区 ============ */
.page-faq .faq-body {
  position: relative;
  background: var(--snow);
  color: var(--slate);
  --line: rgba(58, 71, 87, 0.14);
  --line-strong: rgba(58, 71, 87, 0.3);
  padding-block: clamp(4rem, 9vw, 6.25rem) clamp(3rem, 7vw, 5rem);
}

.page-faq .faq-body::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: clamp(36px, 5vw, 62px);
  background: var(--ink-2);
  clip-path: polygon(0 0, 100% 0, 100% 40%, 0 100%);
  pointer-events: none;
}

.page-faq .faq-layout {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.25rem);
  align-items: start;
}

/* ---- 左侧索引 ---- */
.page-faq .faq-rail {
  min-width: 0;
}

.page-faq .faq-rail__title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: rgba(58, 71, 87, 0.62);
  margin: 0 0 0.65rem;
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.35rem;
  display: flex;
  gap: 0.4rem;
  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: 0.5rem;
  padding: 0.45rem 0.7rem;
  font-size: 0.86rem;
  color: rgba(58, 71, 87, 0.86);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-faq .faq-rail__list .ub-num {
  font-size: 0.7rem;
  color: rgba(58, 71, 87, 0.5);
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  color: var(--ink);
  border-color: var(--lime);
  background: rgba(139, 255, 60, 0.14);
  outline: none;
}

/* ---- 答案区 ---- */
.page-faq .faq-main {
  min-width: 0;
}

.page-faq .faq-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.25rem;
  padding-bottom: 0.95rem;
  border-bottom: 1px solid var(--line-strong);
  margin-bottom: clamp(1.75rem, 4vw, 2.5rem);
}

.page-faq .faq-tools .ub-filter {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.page-faq .faq-tools .ub-filter__btn {
  font-family: inherit;
  font-size: 0.82rem;
  line-height: 1.4;
  padding: 0.38rem 0.8rem;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  background: transparent;
  color: var(--slate);
  cursor: pointer;
  clip-path: var(--cut-sm);
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-faq .faq-tools .ub-filter__btn:hover,
.page-faq .faq-tools .ub-filter__btn:focus-visible {
  border-color: var(--pine);
  color: var(--ink);
  outline: none;
}

.page-faq .faq-tools .ub-filter__btn[aria-pressed="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--lime);
}

.page-faq .faq-count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: rgba(58, 71, 87, 0.68);
}

/* ---- 分组 ---- */
.page-faq .faq-group {
  margin-bottom: clamp(2rem, 5vw, 3.25rem);
  scroll-margin-top: calc(var(--rail-h) + var(--main-h) + 1.5rem);
}

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

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid rgba(224, 169, 58, 0.55);
  margin-bottom: 0.35rem;
}

.page-faq .faq-group__num {
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--gold);
  flex: 0 0 auto;
}

.page-faq .faq-group__head .ub-h2 {
  margin: 0;
  font-size: clamp(1.12rem, 2.4vw, 1.45rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--ink);
}

.page-faq .faq-group__meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: rgba(58, 71, 87, 0.58);
  flex: 0 0 auto;
}

/* ---- 问答条目 ---- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-item[hidden] {
  display: none;
}

.page-faq .faq-item__q {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.95rem 0;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
  transition: color 0.2s ease;
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__q::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: rgba(58, 71, 87, 0.5);
  transition: color 0.2s ease;
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "–";
  color: var(--pine);
}

.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible {
  color: var(--pine);
  outline: none;
}

.page-faq .faq-item__idx {
  flex: 0 0 auto;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-faq .faq-item__a {
  padding: 0 0 1.15rem 1.7rem;
}

.page-faq .faq-item__a p {
  margin: 0 0 0.65rem;
  font-size: 0.94rem;
  line-height: 1.78;
  color: rgba(58, 71, 87, 0.9);
  max-width: 64ch;
}

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

.page-faq .faq-item__lead {
  border-left: 3px solid var(--lime);
  padding-left: 0.85rem;
  color: var(--ink) !important;
}

.page-faq .faq-item__next {
  display: inline-block;
  margin-top: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--pine);
  text-decoration: none;
  border-bottom: 1px solid rgba(14, 50, 58, 0.32);
  padding-bottom: 1px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-item__next::after {
  content: " →";
}

.page-faq .faq-item__next:hover,
.page-faq .faq-item__next:focus-visible {
  color: var(--ink);
  border-color: var(--lime);
  outline: none;
}

/* ---- 中间插图 ---- */
.page-faq .faq-figure {
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 clamp(2.25rem, 5vw, 3.25rem);
  background: var(--ink);
  clip-path: var(--cut-panel);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  padding: 0.85rem clamp(1rem, 3vw, 1.5rem) 1.05rem;
  color: var(--frost);
  font-size: 0.82rem;
  line-height: 1.65;
}

/* ============ 页尾引导条 ============ */
.page-faq .faq-tail {
  position: relative;
  overflow: hidden;
  color: var(--snow);
  padding-block: clamp(2.5rem, 6vw, 4rem);
  background:
    radial-gradient(90% 120% at 86% 6%, rgba(139, 255, 60, 0.14), transparent 56%),
    linear-gradient(135deg, var(--indigo) 0%, #241244 62%, var(--ink) 100%);
}

.page-faq .faq-tail__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.85rem;
  align-items: start;
}

.page-faq .faq-tail .ub-kicker {
  color: var(--lime);
  letter-spacing: 0.2em;
  margin: 0 0 0.5rem;
}

.page-faq .faq-tail .ub-h2 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.3rem, 3vw, 1.85rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--snow);
}

.page-faq .faq-tail__text {
  margin: 0 0 1.5rem;
  color: var(--frost);
  font-size: 0.95rem;
  line-height: 1.8;
  max-width: 52ch;
}

.page-faq .faq-tail .ub-btn {
  display: inline-block;
  text-decoration: none;
}

.page-faq .faq-tail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-faq .faq-tail__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-tail__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: rgba(199, 210, 224, 0.72);
}

.page-faq .faq-tail__val {
  font-size: 0.9rem;
  color: var(--snow);
  word-break: break-word;
}

/* ============ 桌面布局 ============ */
@media (min-width: 720px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2rem, 5vw, 3.75rem);
  }

  .page-faq .faq-tail__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2rem, 5vw, 3.5rem);
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: var(--faq-gutter);
  }

  .page-faq .faq-rail__inner {
    position: sticky;
    top: calc(var(--rail-h) + var(--main-h) + 1.75rem);
  }

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

  .page-faq .faq-rail__list a {
    white-space: normal;
    border-bottom: 0;
    border-left: 2px solid transparent;
    padding: 0.55rem 0.75rem;
    font-size: 0.875rem;
  }

  .page-faq .faq-rail__list a:hover,
  .page-faq .faq-rail__list a:focus-visible {
    border-color: var(--lime);
    background: transparent;
  }

  .page-faq .faq-item__a {
    padding-left: 1.95rem;
  }
}

@media (min-width: 1180px) {
  .page-faq {
    --faq-rail-w: 232px;
  }

  .page-faq .faq-hero__facts {
    gap: 1.2rem 3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__list a,
  .page-faq .faq-item__q,
  .page-faq .faq-item__q::after,
  .page-faq .faq-item__next,
  .page-faq .faq-tools .ub-filter__btn {
    transition: none;
  }
}