.page-faq {
  --faq-cut: 16px;
}

/* ---------- 首屏：问题入口 + 夜场资料馆 ---------- */
.page-faq .faq-hero {
  padding-block: clamp(1rem, 3vw, 1.6rem) clamp(1.75rem, 5vw, 3rem);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  margin-top: clamp(1.25rem, 3.5vw, 2.25rem);
}

.page-faq .faq-hero h1 {
  margin: .55rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 7.2vw, 4rem);
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--paper);
  text-wrap: balance;
}

.page-faq .faq-hero .lede {
  margin: clamp(.9rem, 2vw, 1.2rem) 0 0;
  max-width: 46ch;
  font-size: clamp(.97rem, 1.6vw, 1.06rem);
  line-height: 1.78;
  color: #B9C1D3;
}

.page-faq .faq-hero__keys {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem .6rem;
  margin: clamp(1.2rem, 3vw, 1.8rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__keys li {
  display: inline-flex;
  align-items: baseline;
  gap: .4rem;
  padding: .38rem .72rem;
  border: 1px solid rgba(46, 74, 125, .75);
  font-size: .82rem;
  color: var(--mist);
}

.page-faq .faq-hero__keys .mono {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .95rem;
  font-variant-numeric: tabular-nums;
  color: var(--lime);
}

.page-faq .faq-hero__figure {
  margin: 0;
  border: 1px solid rgba(46, 74, 125, .6);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06);
}

.page-faq .faq-hero__figure .figure__cap {
  padding: .6rem .85rem;
  border-top: 1px solid rgba(46, 74, 125, .6);
  font-size: .78rem;
  color: var(--mist);
}

/* ---------- 两栏：索引 + 问答 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  padding-block: clamp(1.75rem, 4.5vw, 3rem) clamp(3rem, 7vw, 5.5rem);
  border-top: 1px solid rgba(46, 74, 125, .55);
}

.page-faq .faq-index {
  border: 1px solid rgba(46, 74, 125, .6);
  background: linear-gradient(165deg, rgba(21, 27, 41, .95), rgba(11, 18, 48, .7));
  padding: 1rem .85rem 1.15rem;
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
}

.page-faq .faq-index__title {
  margin: 0 0 .8rem;
  padding-inline-start: .55rem;
  border-inline-start: 2px solid var(--lime);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .7rem;
  letter-spacing: .16em;
  line-height: 1.3;
  color: var(--lime);
}

.page-faq .faq-index__list {
  display: grid;
  gap: .15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .6rem;
  align-items: baseline;
  padding: .55rem .5rem;
  border-inline-start: 2px solid transparent;
  font-size: .9rem;
  line-height: 1.5;
  color: var(--paper);
  text-decoration: none;
  transition: color .18s var(--ease), background-color .18s var(--ease), border-color .18s var(--ease);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  color: var(--mist);
  transition: color .18s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--lime);
  border-inline-start-color: var(--lime);
  background: var(--lime-soft);
}

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

/* ---------- 章节标题 ---------- */
.page-faq .faq-group + .faq-group {
  margin-top: clamp(2.25rem, 5vw, 3.5rem);
  padding-top: clamp(2rem, 4.5vw, 3rem);
  border-top: 1px solid rgba(46, 74, 125, .5);
}

.page-faq .faq-group__head {
  display: grid;
  gap: .35rem;
  margin-bottom: clamp(1rem, 2.5vw, 1.5rem);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--lime);
}

.page-faq .faq-group h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.8vw, 2.2rem);
  line-height: 1.05;
  letter-spacing: -.012em;
  color: var(--paper);
}

.page-faq .faq-group__intro {
  margin: .35rem 0 0;
  max-width: 64ch;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: .5rem;
}

.page-faq .qa {
  border: 1px solid rgba(46, 74, 125, .55);
  background: var(--ink-800);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .qa:hover {
  border-color: rgba(46, 74, 125, .95);
}

.page-faq .qa[open] {
  border-color: var(--lime-line);
  background: linear-gradient(152deg, var(--ink-700) 0%, var(--ink-800) 72%);
}

.page-faq .qa__q {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 16px;
  gap: .85rem;
  align-items: center;
  padding: .95rem 1.1rem;
  font-size: .98rem;
  font-weight: 500;
  line-height: 1.55;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
  transition: color .18s var(--ease);
}

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

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

.page-faq .qa__q:hover,
.page-faq .qa__q:focus-visible {
  color: var(--lime);
}

.page-faq .qa[open] .qa__q {
  color: var(--paper);
}

.page-faq .qa__sign {
  position: relative;
  width: 16px;
  height: 16px;
  justify-self: end;
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  background: var(--steel);
  transition: background-color .18s var(--ease), transform .2s var(--ease), opacity .2s var(--ease);
}

.page-faq .qa__sign::before {
  left: 0;
  right: 0;
  top: 7px;
  height: 2px;
}

.page-faq .qa__sign::after {
  top: 0;
  bottom: 0;
  left: 7px;
  width: 2px;
}

.page-faq .qa__q:hover .qa__sign::before,
.page-faq .qa__q:hover .qa__sign::after,
.page-faq .qa[open] .qa__sign::before,
.page-faq .qa[open] .qa__sign::after {
  background: var(--lime);
}

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

.page-faq .qa__a {
  padding: 0 1.1rem 1.15rem;
  border-top: 1px dashed rgba(46, 74, 125, .65);
  font-size: .94rem;
  line-height: 1.8;
  color: #B7BFD2;
}

.page-faq .qa__a > p {
  margin: .85rem 0 0;
}

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

.page-faq .qa__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 214, 196, .4);
  transition: border-color .18s var(--ease);
}

.page-faq .qa__a a:hover,
.page-faq .qa__a a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 下载章节配图 ---------- */
.page-faq .faq-media {
  margin: 1.25rem 0 0;
  border: 1px solid rgba(46, 74, 125, .6);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-faq .faq-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.94) contrast(1.04);
}

.page-faq .faq-media .figure__cap {
  padding: .58rem .8rem;
  border-top: 1px solid rgba(46, 74, 125, .6);
  font-size: .77rem;
  color: var(--mist);
}

/* ---------- 底部求助 ---------- */
.page-faq .faq-cta {
  padding-block: clamp(2.25rem, 5vw, 3.5rem);
  border-top: 1px solid rgba(46, 74, 125, .55);
  background: linear-gradient(118deg, rgba(42, 58, 31, .7) 0%, rgba(11, 18, 48, 0) 58%);
}

.page-faq .faq-cta__panel {
  display: grid;
  gap: .5rem;
  padding: clamp(1.4rem, 4vw, 2.4rem);
  border: 1px solid rgba(198, 255, 61, .28);
  background: linear-gradient(160deg, rgba(21, 27, 41, .92), rgba(11, 18, 48, .55));
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.page-faq .faq-cta__panel h2 {
  margin: .25rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 3.8vw, 2.05rem);
  line-height: 1.06;
  letter-spacing: -.012em;
  color: var(--paper);
}

.page-faq .faq-cta__text {
  margin: 0;
  max-width: 58ch;
  font-size: .95rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: .9rem;
}

.page-faq .faq-cta__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: .85rem 1.5rem;
  margin: 1.1rem 0 0;
  padding-top: 1.05rem;
  border-top: 1px dashed rgba(198, 255, 61, .25);
  font-size: .88rem;
}

.page-faq .faq-cta__facts dt {
  margin: 0 0 .2rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-faq .faq-cta__facts dd {
  margin: 0;
  line-height: 1.6;
  color: var(--paper);
  overflow-wrap: anywhere;
}

/* ---------- 窄屏：索引变横向滑动条 ---------- */
@media (max-width: 979px) {
  .page-faq .faq-index__list {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: .4rem;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scrollbar-width: thin;
    padding-bottom: .35rem;
  }

  .page-faq .faq-index__link {
    align-items: center;
    padding: .45rem .75rem;
    border: 1px solid rgba(46, 74, 125, .7);
    font-size: .85rem;
  }

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

/* ---------- 平板起：索引固定，下载章节并排 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-download {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 264px;
    column-gap: clamp(1.25rem, 3vw, 2rem);
    row-gap: 1.25rem;
    align-items: start;
  }

  .page-faq .faq-download .faq-group__head {
    grid-column: 1 / -1;
    margin-bottom: 0;
  }

  .page-faq .faq-download .faq-media {
    margin: 0;
  }

  .page-faq .faq-cta__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: end;
  }

  .page-faq .faq-body {
    grid-template-columns: 236px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 1.5rem;
  }

  .page-faq .faq-download {
    grid-template-columns: minmax(0, 1fr) 288px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-body {
    grid-template-columns: 254px minmax(0, 1fr);
    column-gap: clamp(2.5rem, 4vw, 3.5rem);
  }
}