.page-faq {
  --faq-index-w: 252px;
  --faq-cut: 16px;
}

/* ============ 首屏 ============ */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(96px, 15vw, 148px) 0 clamp(36px, 6vw, 64px);
  background:
    radial-gradient(120% 90% at 86% 4%, rgba(127, 212, 255, .20), transparent 58%),
    linear-gradient(180deg, var(--ink-soft), var(--ink) 72%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  right: -12%;
  bottom: 6%;
  width: min(62%, 640px);
  height: min(56%, 380px);
  background: linear-gradient(135deg, rgba(43, 245, 208, .16), rgba(24, 74, 122, .04) 70%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  transform: rotate(-7deg);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(127, 212, 255, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(127, 212, 255, .07) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 84%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 84%);
  pointer-events: none;
}

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

.page-faq .faq-hero .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(28px, 5.4vw, 54px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--ice-white);
}

.page-faq .faq-hero__lede {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 38em;
  font-size: clamp(15px, 1.8vw, 16.5px);
  line-height: 1.8;
  color: var(--silver);
}

.page-faq .faq-hero__stats {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
}

.page-faq .faq-hero__stat {
  padding-left: 12px;
  border-left: 2px solid var(--neon);
  min-width: 0;
}

.page-faq .faq-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 3vw, 26px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ice-white);
}

.page-faq .faq-hero__num--amber {
  color: var(--amber);
}

.page-faq .faq-hero__cap {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--silver);
}

.page-faq .faq-quick {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  margin: clamp(26px, 4vw, 36px) 0 0;
  font-size: 14.5px;
}

.page-faq .faq-hero__media {
  position: relative;
  z-index: 1;
  margin-top: clamp(30px, 5vw, 52px);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  min-height: 180px;
  aspect-ratio: 1440 / 440;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

/* ============ 问答主体 ============ */
.page-faq .faq-body {
  background:
    radial-gradient(90% 60% at 4% 0%, rgba(24, 74, 122, .42), transparent 62%),
    var(--ink);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 46px);
}

/* 主题索引 */
.page-faq .faq-index__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0 0 6px;
  display: flex;
  flex-direction: row;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--silver);
  text-decoration: none;
  border-bottom: 2px solid rgba(127, 212, 255, .22);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-index__link .mono {
  font-size: 12px;
  color: var(--ice);
  letter-spacing: .08em;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--ice-white);
  border-color: var(--neon);
  background: rgba(24, 74, 122, .45);
}

.page-faq .faq-index__link[data-active="true"] {
  color: var(--neon);
  border-color: var(--neon);
  background: rgba(43, 245, 208, .08);
}

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

.page-faq .faq-group {
  scroll-margin-top: 112px;
  position: relative;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(42px, 6vw, 68px);
}

.page-faq .faq-group + .faq-group::before {
  content: "";
  position: absolute;
  top: calc(clamp(42px, 6vw, 68px) * -0.5);
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, rgba(43, 245, 208, .6), rgba(127, 212, 255, .14) 46%, transparent);
  transform: skewY(-1.6deg);
  transform-origin: left center;
}

.page-faq .faq-group__head {
  display: grid;
  gap: 8px;
}

.page-faq .faq-group__num {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--neon);
}

.page-faq .faq-group__num::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--neon);
  transform: skewX(-28deg);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.2vw, 30px);
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--ice-white);
}

.page-faq .faq-group__lede {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

/* 问答条目 */
.page-faq .faq-list {
  margin-top: clamp(18px, 3vw, 26px);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-faq .faq-item {
  position: relative;
  background: rgba(24, 74, 122, .42);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--neon);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}

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

.page-faq .faq-item[open] {
  background: rgba(24, 74, 122, .66);
  border-color: rgba(43, 245, 208, .42);
}

.page-faq .faq-item:hover {
  border-color: rgba(43, 245, 208, .55);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 18px 15px 20px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 2.1vw, 16.5px);
  font-weight: 500;
  line-height: 1.6;
  color: var(--ice-white);
  transition: color var(--dur) var(--ease);
}

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

.page-faq .faq-item__q::after {
  content: "+";
  flex: none;
  margin-left: 6px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.4;
  color: var(--ice);
  transition: color var(--dur) var(--ease);
}

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

.page-faq .faq-item__q:hover {
  color: var(--mint);
}

.page-faq .faq-item__a {
  padding: 0 20px 17px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--silver);
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 42em;
}

.page-faq .faq-k {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--amber);
}

/* 数据对照分栏 */
.page-faq .faq-group__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-faq .faq-group__split .faq-list {
  margin-top: clamp(18px, 3vw, 26px);
}

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

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

/* ============ 页尾提示带 ============ */
.page-faq .faq-cta {
  padding-top: 0;
}

.page-faq .faq-cta__band {
  display: grid;
  gap: 10px;
  padding: clamp(22px, 4vw, 34px);
  text-decoration: none;
  background: linear-gradient(100deg, rgba(255, 122, 47, .18), rgba(24, 74, 122, .55) 48%, rgba(5, 11, 24, .92));
  border: 1px solid rgba(255, 122, 47, .42);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
  transition: filter var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-cta__band:hover,
.page-faq .faq-cta__band:focus-visible {
  filter: brightness(1.16);
  border-color: var(--amber);
}

.page-faq .faq-cta__label {
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--amber);
}

.page-faq .faq-cta__text {
  max-width: 46em;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.75;
  color: var(--ice-white);
}

.page-faq .faq-cta__go {
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: .06em;
  color: var(--amber);
}

/* ============ 响应式 ============ */
@media (min-width: 620px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-group__split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }

  .page-faq .faq-cta__band {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: 22px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, var(--faq-index-w)) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 104px;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index__link {
    border-bottom: 0;
    border-left: 2px solid rgba(127, 212, 255, .22);
    padding: 10px 12px 10px 14px;
    white-space: normal;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  }
}

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