.page-faq {
  --fq-gap: clamp(22px, 3vw, 44px);
  --fq-rail-w: 218px;
  position: relative;
  padding-bottom: clamp(48px, 7vw, 96px);
  color: var(--hu-snow);
}

/* ---------- Hero ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: clamp(28px, 4.8vw, 64px) 0 0;
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -14%;
  width: min(640px, 66%);
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(circle at 62% 34%, rgba(53, 224, 208, 0.15), transparent 60%),
    radial-gradient(circle at 26% 76%, rgba(183, 55, 46, 0.2), transparent 58%);
  pointer-events: none;
}

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

.page-faq .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(26px, 3.4vw, 48px);
  align-items: end;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(29px, 4.6vw, 52px);
  line-height: 1.18;
  letter-spacing: -0.012em;
  color: var(--hu-snow);
}

.page-faq .faq-hero__intro {
  margin: 18px 0 0;
  max-width: 60ch;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.85;
  color: rgba(243, 239, 230, 0.74);
}

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

.page-faq .faq-hero__media {
  margin: 0;
  background: var(--hu-rock);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
  overflow: hidden;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-faq .faq-hero__cap {
  padding: 12px 18px 15px;
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.65;
  color: var(--hu-grey);
  background: rgba(23, 28, 34, 0.92);
}

.page-faq .faq-band {
  height: 3px;
  margin-top: clamp(26px, 3.4vw, 46px);
  background: linear-gradient(
    90deg,
    var(--hu-blue) 0 20%,
    var(--hu-snow) 20% 40%,
    var(--hu-red) 40% 60%,
    var(--hu-moss) 60% 80%,
    var(--hu-gold) 80% 100%
  );
  opacity: 0.72;
}

/* ---------- 索引 ---------- */

.page-faq .faq-index {
  padding: clamp(32px, 4.6vw, 62px) 0;
  border-bottom: 1px solid var(--hu-line-soft);
}

.page-faq .faq-index .section__head {
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-faq .faq-index__grid {
  display: grid;
  gap: clamp(24px, 3vw, 44px);
}

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

.page-faq .faq-index__list > li {
  border-bottom: 1px solid var(--hu-line-soft);
}

.page-faq .faq-index__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 15px 8px 15px 22px;
  text-decoration: none;
  color: var(--hu-snow);
  transition: color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-faq .faq-index__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 11px;
  height: 2px;
  background: var(--hu-cyan);
  transform: translateY(-50%) scaleX(0.3);
  transform-origin: left center;
  transition: transform 0.26s var(--ease);
}

.page-faq .faq-index__link:hover::before,
.page-faq .faq-index__link:focus-visible::before {
  transform: translateY(-50%) scaleX(1);
}

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

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

.page-faq .faq-index__name {
  font-family: var(--font-display);
  font-size: clamp(16px, 1.4vw, 19px);
  font-weight: 700;
}

.page-faq .faq-index__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--hu-cyan);
}

.page-faq .faq-index__media {
  margin: 0;
  background: var(--hu-rock);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  overflow: hidden;
}

.page-faq .faq-index__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 主体：左锚点 + 右问答 ---------- */

.page-faq .faq-body {
  display: grid;
  gap: clamp(28px, 3.5vw, 48px);
  padding: clamp(32px, 4.6vw, 64px) 0 0;
}

.page-faq .faq-rail {
  border-top: 1px solid var(--hu-line);
  padding-top: 14px;
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--hu-grey);
}

.page-faq .faq-rail__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
}

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

.page-faq .faq-rail__link {
  position: relative;
  flex: 0 0 auto;
  display: block;
  padding: 9px 15px;
  font-family: var(--font-body);
  font-size: 14.5px;
  color: var(--hu-grey);
  text-decoration: none;
  background: rgba(23, 28, 34, 0.72);
  border: 1px solid var(--hu-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-rail__link::before {
  display: none;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--hu-snow);
  border-color: rgba(53, 224, 208, 0.5);
}

.page-faq .faq-rail__link:focus-visible {
  outline: 2px solid var(--hu-cyan);
  outline-offset: 3px;
}

/* ---------- 问答流 ---------- */

.page-faq .faq-stream {
  display: grid;
  gap: clamp(36px, 5vw, 68px);
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: 108px;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--hu-line);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--hu-red);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.2vw, 29px);
  font-weight: 700;
  color: var(--hu-snow);
}

.page-faq .faq-group__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--hu-grey);
  white-space: nowrap;
}

.page-faq .faq-q {
  border-bottom: 1px solid var(--hu-line-soft);
}

.page-faq .faq-q__trigger {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: clamp(16px, 1.45vw, 19px);
  font-weight: 600;
  line-height: 1.55;
  color: var(--hu-snow);
  transition: color 0.2s var(--ease);
}

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

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

.page-faq .faq-q__trigger:hover {
  color: var(--hu-cyan);
}

.page-faq .faq-q__trigger:focus-visible {
  outline: 2px solid var(--hu-cyan);
  outline-offset: 3px;
}

.page-faq .faq-q__mark {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  margin-top: 5px;
  margin-left: auto;
}

.page-faq .faq-q__mark::before,
.page-faq .faq-q__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--hu-cyan);
  transform: translate(-50%, -50%);
  transition: transform 0.26s var(--ease), opacity 0.26s var(--ease);
}

.page-faq .faq-q__mark::before {
  width: 16px;
  height: 2px;
}

.page-faq .faq-q__mark::after {
  width: 2px;
  height: 16px;
}

.page-faq .faq-q[open] .faq-q__mark::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.page-faq .faq-q__body {
  padding: 2px 0 22px;
  animation: faq-answer-in 0.3s var(--ease);
}

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

.page-faq .faq-q__body p {
  margin: 0 0 10px;
  max-width: 70ch;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(243, 239, 230, 0.74);
}

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

.page-faq .faq-q__body a {
  color: var(--hu-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, 0.35);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-q__body a:hover,
.page-faq .faq-q__body a:focus-visible {
  color: var(--hu-gold);
  border-bottom-color: rgba(232, 180, 74, 0.55);
}

.page-faq .faq-k {
  font-family: var(--font-mono);
  font-size: 0.94em;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--hu-cyan);
}

.page-faq .faq-k--gold {
  color: var(--hu-gold);
}

/* ---------- 支持区 ---------- */

.page-faq .faq-support {
  position: relative;
  margin-top: clamp(42px, 5.4vw, 78px);
  overflow: hidden;
  border-top: 1px solid var(--hu-line);
  border-bottom: 1px solid var(--hu-line);
  background: linear-gradient(135deg, rgba(23, 28, 34, 0.96), rgba(11, 14, 18, 0.96));
}

.page-faq .faq-support::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -64%;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 180, 74, 0.16), transparent 62%);
  pointer-events: none;
}

.page-faq .faq-support__inner {
  position: relative;
  z-index: 1;
  max-width: 64ch;
  padding: clamp(30px, 4.4vw, 58px) 0;
}

.page-faq .faq-support__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.5vw, 34px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--hu-snow);
}

.page-faq .faq-support__text {
  margin: 16px 0 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(243, 239, 230, 0.74);
}

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

.page-faq .faq-support__note {
  margin: 22px 0 0;
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--hu-grey);
}

.page-faq .faq-support__note a {
  color: var(--hu-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, 0.35);
}

.page-faq .faq-support__note a:hover,
.page-faq .faq-support__note a:focus-visible {
  color: var(--hu-gold);
  border-bottom-color: rgba(232, 180, 74, 0.55);
}

/* ---------- 响应式 ---------- */

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-faq .faq-index__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-body {
    grid-template-columns: var(--fq-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: clamp(96px, 12vh, 128px);
    border-top: 0;
    padding-top: 0;
    border-left: 2px solid var(--hu-line);
  }

  .page-faq .faq-rail__title {
    padding-left: 18px;
  }

  .page-faq .faq-rail__nav {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__link {
    padding: 9px 0 9px 18px;
    background: none;
    border: 0;
    clip-path: none;
    font-size: 15px;
  }

  .page-faq .faq-rail__link::before {
    display: block;
    content: "";
    position: absolute;
    left: -2px;
    top: 50%;
    width: 2px;
    height: 0;
    background: var(--hu-cyan);
    transform: translateY(-50%);
    transition: height 0.26s var(--ease);
  }

  .page-faq .faq-rail__link:hover::before,
  .page-faq .faq-rail__link:focus-visible::before {
    height: 20px;
  }
}

@media (max-width: 599px) {
  .page-faq .faq-hero__media {
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  }

  .page-faq .faq-index__media {
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  }

  .page-faq .faq-group__head {
    flex-wrap: wrap;
    gap: 8px 12px;
  }

  .page-faq .faq-group__count {
    margin-left: 0;
  }

  .page-faq .faq-q__trigger {
    gap: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-q__body {
    animation: none;
  }

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