.page-faq {
  --faq-gap: clamp(20px, 4vw, 40px);
  --faq-line: rgba(232, 255, 59, 0.55);
  background: var(--ink-900);
  color: var(--text-on-dark);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(28px, 5vw, 64px) 0 0;
  background:
    radial-gradient(90% 120% at 12% 0%, rgba(18, 41, 74, 0.9) 0%, rgba(10, 27, 51, 0) 62%),
    var(--ink-900);
}

.page-faq .faq-hero .container {
  position: relative;
}

@media (min-width: 960px) {
  .page-faq .faq-hero .container {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.72fr);
    align-items: end;
    column-gap: clamp(32px, 5vw, 64px);
  }

  .page-faq .faq-hero__crumbs,
  .page-faq .faq-hero__eyebrow {
    grid-column: 1 / -1;
  }

  .page-faq .faq-hero__title {
    grid-column: 1;
  }

  .page-faq .faq-hero__lead {
    grid-column: 2;
    padding-bottom: 6px;
  }
}

.page-faq .faq-hero__crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 34px);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-on-dark-dim);
}

.page-faq .faq-hero__crumbs a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.22s var(--ease);
}

.page-faq .faq-hero__crumbs a:hover {
  color: var(--whistle);
}

.page-faq .faq-hero__crumbs .breadcrumbs__sep {
  color: rgba(147, 167, 196, 0.6);
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 14px;
  color: var(--cyan);
}

.page-faq .faq-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.2vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ice);
  text-wrap: balance;
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--text-on-dark-dim);
}

.page-faq .faq-hero__media {
  margin: clamp(28px, 4.5vw, 52px) 0 0;
  border-top: 1px solid var(--hairline);
  position: relative;
  overflow: hidden;
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 27, 51, 0) 45%, rgba(10, 27, 51, 0.82) 100%);
  pointer-events: none;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

/* ---------- 分组索引 ---------- */
.page-faq .faq-index {
  padding: clamp(38px, 6vw, 76px) 0 clamp(22px, 3vw, 34px);
}

.page-faq .faq-index__head {
  margin-bottom: clamp(20px, 3vw, 30px);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 28px;
}

.page-faq .faq-index__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-faq .faq-index__sub {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-index__nav {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 700px) {
  .page-faq .faq-index__nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1120px) {
  .page-faq .faq-index__nav {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-faq .faq-index__link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 22px 20px 26px;
  background: var(--ink-800);
  color: var(--text-on-dark);
  text-decoration: none;
  transition: background 0.28s var(--ease);
}

.page-faq .faq-index__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--whistle);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.34s var(--ease);
}

.page-faq .faq-index__link:hover {
  background: var(--ink-700);
}

.page-faq .faq-index__link:hover::before,
.page-faq .faq-index__link[aria-current="true"]::before {
  transform: scaleY(1);
}

.page-faq .faq-index__link[aria-current="true"] {
  background: var(--ink-700);
}

.page-faq .faq-index__num {
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--mist);
  transition: color 0.28s var(--ease);
}

.page-faq .faq-index__link[aria-current="true"] .faq-index__num {
  color: var(--whistle);
}

.page-faq .faq-index__name {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ice);
}

.page-faq .faq-index__desc {
  font-size: 13px;
  line-height: 1.72;
  color: var(--text-on-dark-dim);
}

/* ---------- 分组章节 ---------- */
.page-faq .faq-group {
  padding: clamp(34px, 5vw, 62px) 0;
  border-top: 1px solid var(--hairline-soft);
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  margin-bottom: clamp(16px, 2.4vw, 26px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--hairline);
}

.page-faq .faq-group__num {
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--mist);
  transition: color 0.3s var(--ease);
}

.page-faq .faq-group[data-active="true"] .faq-group__num {
  color: var(--whistle);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 3.2vw, 2.2rem);
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--ice);
}

.page-faq .faq-group__note {
  margin: 0 0 0 auto;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-list {
  border-top: 1px solid var(--hairline);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--hairline);
  background: transparent;
  transition: background 0.3s var(--ease);
}

.page-faq .faq-item[open] {
  background: linear-gradient(180deg, rgba(18, 41, 74, 0.6) 0%, rgba(18, 41, 74, 0) 100%);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 19px 4px;
  font-size: clamp(15px, 1.7vw, 17px);
  font-weight: 600;
  line-height: 1.6;
  color: var(--ice);
  cursor: pointer;
  list-style: none;
  transition: color 0.24s var(--ease);
}

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

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

.page-faq .faq-item[open] .faq-item__q {
  color: var(--whistle);
}

.page-faq .faq-item__mark {
  flex: 0 0 auto;
  position: relative;
  width: 15px;
  height: 15px;
  margin-top: 6px;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.page-faq .faq-item__mark::before {
  left: 0;
  top: 50%;
  width: 100%;
  height: 1px;
  transform: translateY(-50%);
}

.page-faq .faq-item__mark::after {
  top: 0;
  left: 50%;
  width: 1px;
  height: 100%;
  transform: translateX(-50%);
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

@keyframes faq-line-in {
  from {
    transform: scaleY(0);
  }
  to {
    transform: scaleY(1);
  }
}

.page-faq .faq-item__a {
  position: relative;
  padding: 0 20px 24px 18px;
  max-width: 74ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-on-dark-dim);
}

.page-faq .faq-item__a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--faq-line) 0%, rgba(232, 255, 59, 0.08) 100%);
  transform-origin: top;
}

.page-faq .faq-item[open] .faq-item__a::before {
  animation: faq-line-in 0.42s var(--ease) both;
}

.page-faq .faq-item__a p {
  margin: 0 0 12px;
}

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

.page-faq .faq-item__a strong {
  color: var(--ice);
  font-weight: 600;
}

/* ---------- 章节配图 ---------- */
.page-faq .faq-figure {
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--ink-800);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.92);
}

.page-faq .faq-figure figcaption {
  padding: 12px 18px;
  border-top: 1px solid var(--hairline);
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 人工支持 ---------- */
.page-faq .faq-support {
  padding: clamp(38px, 6vw, 78px) 0 clamp(54px, 8vw, 96px);
}

.page-faq .faq-support__panel {
  position: relative;
  padding: clamp(24px, 4vw, 46px);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(59, 224, 200, 0.12) 0%, rgba(59, 224, 200, 0) 55%),
    var(--ink-800);
}

.page-faq .faq-support__eyebrow {
  margin: 0 0 12px;
  color: var(--mist);
}

.page-faq .faq-support__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-faq .faq-support__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-on-dark-dim);
}

.page-faq .faq-support__list {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-faq .faq-support__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  padding: 15px 18px;
  background: var(--ink-900);
}

.page-faq .faq-support__k {
  flex: 0 0 84px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-faq .faq-support__v {
  flex: 1 1 220px;
  min-width: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ice);
  word-break: break-word;
}

.page-faq .faq-support__note {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 66ch;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-support__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 224, 200, 0.4);
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-faq .faq-support__note a:hover {
  color: var(--whistle);
  border-bottom-color: rgba(232, 255, 59, 0.6);
}

/* ---------- 窄屏收束 ---------- */
@media (max-width: 560px) {
  .page-faq .faq-hero__title {
    font-size: clamp(1.8rem, 8vw, 2.4rem);
  }

  .page-faq .faq-group__note {
    margin-left: 0;
    flex-basis: 100%;
  }

  .page-faq .faq-item__q {
    padding: 17px 2px;
  }

  .page-faq .faq-item__a {
    padding-right: 6px;
    padding-left: 15px;
  }

  .page-faq .faq-support__k {
    flex-basis: 100%;
  }

  .page-faq .faq-support__row {
    padding: 14px 14px;
  }
}

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

  .page-faq .faq-item[open] .faq-item__a::before {
    animation: none;
  }
}