.page-faq {
  --faq-radius: 2px;
  position: relative;
  background-color: var(--night);
  background-image:
    linear-gradient(rgba(148, 163, 184, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, .05) 1px, transparent 1px),
    radial-gradient(115% 55% at 80% 0%, rgba(61, 220, 132, .14), transparent 62%),
    linear-gradient(180deg, var(--turf) 0%, #071A2B 44%, var(--night) 100%);
  background-size: 72px 72px, 72px 72px, auto, auto;
  background-repeat: repeat, repeat, no-repeat, no-repeat;
  color: var(--body-text);
  padding-bottom: 1.5rem;
}

.page-faq .breadcrumb {
  padding-top: 1.1rem;
}

.page-faq .breadcrumb ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  font-size: .8rem;
  font-family: var(--font-mono);
  letter-spacing: .04em;
}

.page-faq .breadcrumb li + li::before {
  content: "/";
  margin-right: .4rem;
  color: var(--line-strong);
}

.page-faq .breadcrumb a {
  color: var(--neutral);
  text-decoration: none;
  transition: color .2s ease;
}

.page-faq .breadcrumb a:hover {
  color: var(--cyan);
}

.page-faq .breadcrumb li[aria-current="page"] {
  color: var(--signal);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding: 1.6rem 0 .4rem;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 6vw, 3.25rem);
  line-height: 1.12;
  letter-spacing: -.015em;
  color: var(--mist);
  margin: .85rem 0 0;
  max-width: 22ch;
  text-wrap: balance;
}

.page-faq .faq-hero__lead {
  margin: 1rem 0 0;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--body-text);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1.35rem;
}

.page-faq .faq-chip {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  padding: .36rem .72rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--neutral);
  background: rgba(7, 26, 43, .55);
  white-space: nowrap;
}

/* ---------- 主体栅格 ---------- */

.page-faq .faq-layout {
  display: grid;
  gap: 1.75rem;
  padding-top: 2.25rem;
  padding-bottom: 3.5rem;
}

@media (min-width: 980px) {
  .page-faq .faq-layout {
    grid-template-columns: 224px minmax(0, 1fr);
    gap: 3.5rem;
    padding-top: 3rem;
  }
}

/* ---------- 左侧索引 ---------- */

.page-faq .faq-index__title {
  margin: 0 0 .85rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--neutral);
}

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

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  padding: .72rem 0;
  border-bottom: 1px solid var(--line);
  font-size: .9rem;
  line-height: 1.5;
  color: var(--body-text);
  text-decoration: none;
  transition: color .2s ease, padding-left .2s ease;
}

.page-faq .faq-index__link:hover {
  color: var(--cyan);
  padding-left: .35rem;
}

.page-faq .faq-index__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: .74rem;
  color: var(--signal);
}

@media (max-width: 979px) {
  .page-faq .faq-index__list {
    display: flex;
    gap: .5rem;
    border-top: 0;
    padding-bottom: .55rem;
    overflow-x: auto;
    scrollbar-width: none;
  }

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

  .page-faq .faq-index__link {
    flex: none;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: .45rem .8rem;
    white-space: nowrap;
    font-size: .84rem;
  }

  .page-faq .faq-index__link:hover {
    padding-left: .8rem;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-index {
    position: sticky;
    top: 108px;
    align-self: start;
  }
}

/* ---------- 章节 ---------- */

.page-faq .chapter {
  padding-top: 3rem;
  scroll-margin-top: 104px;
}

.page-faq .chapter:first-child {
  padding-top: 0;
}

.page-faq .chapter__index {
  font-family: var(--font-mono);
  color: var(--signal);
  letter-spacing: .12em;
}

.page-faq .chapter__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 3.6vw, 1.85rem);
  line-height: 1.3;
  color: var(--mist);
  margin: .3rem 0 .6rem;
  text-wrap: balance;
}

.page-faq .chapter__lead {
  margin: 0;
  max-width: 62ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--neutral);
}

/* ---------- 三步入门 ---------- */

.page-faq .faq-steps {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: .9rem;
}

@media (min-width: 780px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-faq .faq-step {
  position: relative;
  padding: 1.1rem 1.1rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  background: linear-gradient(165deg, rgba(30, 41, 59, .82) 0%, rgba(7, 26, 43, .72) 100%);
  box-shadow: 0 20px 40px -34px rgba(0, 0, 0, .95);
  transition: border-color .22s ease, transform .22s ease;
}

.page-faq .faq-step::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--signal);
  transform: scaleY(.28);
  transform-origin: top;
  transition: transform .28s ease;
}

.page-faq .faq-step:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-faq .faq-step:hover::after {
  transform: scaleY(1);
}

.page-faq .faq-step__num {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  color: var(--signal);
}

.page-faq .faq-step__title {
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--mist);
  margin: .55rem 0 .5rem;
}

.page-faq .faq-step p {
  margin: 0 0 .85rem;
  font-size: .89rem;
  line-height: 1.75;
  color: var(--body-text);
}

.page-faq .faq-step .text-link {
  font-size: .86rem;
}

/* ---------- 图片 ---------- */

.page-faq .faq-figure {
  margin: 1.8rem 0 0;
}

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

/* ---------- 折叠问答 ---------- */

.page-faq .faq-list {
  margin-top: 1.4rem;
  border-top: 1px solid var(--line);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
  border-radius: var(--faq-radius);
  background: transparent;
  transition: background-color .24s ease, border-color .24s ease;
}

.page-faq .faq-item[open] {
  background: rgba(30, 41, 59, .55);
  border-bottom-color: rgba(25, 227, 209, .38);
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: .8rem;
  padding: .92rem .5rem;
  cursor: pointer;
  list-style: none;
  font-size: .97rem;
  line-height: 1.65;
  color: #E6EFEB;
  transition: color .2s ease;
}

.page-faq .faq-item > summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item > summary::marker {
  content: "";
}

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

.page-faq .faq-q {
  flex: none;
  width: 1.5rem;
  padding-top: .26rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--signal);
}

.page-faq .faq-item__label {
  flex: 1 1 auto;
  margin: 0;
  font-family: var(--font-body);
  font-size: .97rem;
  font-weight: 600;
  line-height: 1.65;
}

.page-faq .faq-mark {
  flex: none;
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: .42rem;
}

.page-faq .faq-mark::before,
.page-faq .faq-mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform .22s ease, opacity .22s ease;
}

.page-faq .faq-mark::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 1.5px;
}

.page-faq .faq-mark::after {
  left: 7px;
  top: 0;
  width: 1.5px;
  height: 16px;
}

.page-faq .faq-item[open] .faq-mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-a {
  padding: 0 .8rem 1.1rem 1.35rem;
  font-size: .92rem;
  line-height: 1.9;
  color: var(--body-text);
}

.page-faq .faq-a p {
  margin: 0;
}

.page-faq .faq-a p + p {
  margin-top: .7rem;
}

@media (min-width: 640px) {
  .page-faq .faq-a {
    padding: 0 1.8rem 1.2rem 2.8rem;
  }
}

/* ---------- 收尾 ---------- */

.page-faq .faq-cta {
  margin-top: 3rem;
  padding-top: 1.7rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.page-faq .faq-cta p {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--mist);
}

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

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

  .page-faq .faq-step:hover {
    transform: none;
  }
}