.page-faq {
  --faq-num: 28px;
  --faq-numgap: 8px;
  --faq-stripe: linear-gradient(90deg, var(--signal-500), var(--data-400));
  position: relative;
  padding-top: calc(var(--topbar-h) + clamp(14px, 3vw, 28px));
  padding-bottom: clamp(48px, 7vw, 88px);
  color: var(--paper-050);
  font-family: var(--font-body);
  line-height: 1.75;
  background:
    radial-gradient(120% 55% at 100% 0%, rgba(42, 42, 94, .5) 0%, rgba(7, 20, 15, 0) 62%),
    var(--ink-900);
}

.page-faq .faq-shell {
  display: grid;
  gap: clamp(20px, 3.4vw, 38px);
  max-width: var(--maxw);
}

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

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(22px, 4.2vw, 48px);
  border: 1px solid var(--line-700);
  border-radius: var(--radius);
  background: linear-gradient(116deg, var(--panel-800) 0%, var(--panel-800) 56%, var(--indigo-700) 56%, var(--indigo-700) 100%);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -46%;
  width: 78%;
  height: 240px;
  border: 1px solid rgba(46, 196, 255, .22);
  border-radius: 50%;
  pointer-events: none;
}

.page-faq .faq-hero__copy {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 12px;
  max-width: 62ch;
}

.page-faq .faq-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 5.4vw, 50px);
  line-height: 1.08;
  letter-spacing: -.01em;
  font-weight: 700;
}

.page-faq .faq-hero__lead {
  margin: 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--paper-050);
  opacity: .86;
  max-width: 46ch;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

/* ---------- 索引 + 首图 ---------- */
.page-faq .faq-board {
  display: grid;
  gap: var(--gap);
}

.page-faq .faq-index {
  display: grid;
  gap: 12px;
  padding: 16px clamp(14px, 2.4vw, 22px);
  border: 1px solid var(--line-700);
  border-left: 3px solid var(--signal-500);
  border-radius: var(--radius);
  background: var(--panel-800);
  box-shadow: var(--shadow-hard);
  align-content: start;
}

.page-faq .faq-index__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted-400);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-index__chip {
  display: inline-block;
  padding: 5px 11px;
  border: 1px solid var(--line-700);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  color: var(--data-400);
  text-decoration: none;
  transition: background-color .15s ease, color .15s ease, border-color .15s ease;
}

.page-faq .faq-index__chip:hover,
.page-faq .faq-index__chip:focus-visible {
  background: var(--data-400);
  border-color: var(--data-400);
  color: var(--ink-900);
}

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

.page-faq .faq-board__media img,
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line-700);
  border-radius: var(--radius);
  background: var(--panel-800);
}

/* ---------- 章节 ---------- */
.page-faq .faq-section {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-faq .faq-section__head {
  display: grid;
  gap: 6px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-700);
}

.page-faq .faq-section__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.2vw, 31px);
  line-height: 1.16;
  letter-spacing: -.01em;
}

/* ---------- 三步上手 ---------- */
.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--gap);
  counter-reset: none;
}

.page-faq .step {
  position: relative;
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 24px 18px 18px;
  border: 1px solid var(--line-700);
  border-radius: var(--radius);
  background: var(--panel-800);
  box-shadow: var(--shadow-hard);
}

.page-faq .step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--faq-stripe);
}

.page-faq .step__num {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--signal-500);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
}

.page-faq .step h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.35;
  letter-spacing: -.01em;
}

.page-faq .step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted-400);
}

.page-faq .step__link {
  justify-self: start;
  margin-top: 2px;
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--data-400);
  text-decoration: none;
  border-bottom: 1px solid var(--line-700);
}

.page-faq .step__link:hover,
.page-faq .step__link:focus-visible {
  color: var(--signal-500);
  border-color: var(--signal-500);
}

/* ---------- 问答折叠 ---------- */
.page-faq .faq-list {
  position: relative;
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0 0 0 calc(var(--faq-num) + var(--faq-numgap));
  list-style: none;
}

.page-faq .faq-list::before {
  content: "";
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: calc(var(--faq-num) / 2);
  width: 1px;
  background: var(--line-700);
}

.page-faq .faq-item {
  position: relative;
  border: 1px solid var(--line-700);
  border-radius: var(--radius);
  background: var(--panel-800);
  box-shadow: var(--shadow-hard);
  transition: border-color .18s ease, box-shadow .18s ease;
}

.page-faq .faq-item[open] {
  border-color: var(--data-400);
  box-shadow: 0 2px 0 var(--data-400);
}

.page-faq .faq-item__num {
  position: absolute;
  top: 12px;
  left: calc(-1 * (var(--faq-num) + var(--faq-numgap)));
  z-index: 1;
  display: grid;
  place-items: center;
  width: var(--faq-num);
  height: var(--faq-num);
  border: 1px solid var(--line-700);
  border-radius: 50%;
  background: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--data-400);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-item[open] .faq-item__num {
  border-color: var(--data-400);
  color: var(--paper-050);
}

.page-faq .faq-item > summary {
  position: relative;
  display: grid;
  gap: 2px;
  padding: 14px 44px 14px 15px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 16px;
  line-height: 1.4;
  letter-spacing: -.005em;
  color: var(--paper-050);
}

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

.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--signal-500);
  outline-offset: -2px;
}

.page-faq .faq-item__mark {
  position: absolute;
  top: 19px;
  right: 17px;
  width: 12px;
  height: 12px;
}

.page-faq .faq-item__mark::before {
  content: "";
  display: block;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--signal-500);
  border-bottom: 2px solid var(--signal-500);
  transform: rotate(45deg);
  transition: transform .2s ease;
}

.page-faq .faq-item[open] .faq-item__mark::before {
  transform: rotate(-135deg);
}

.page-faq .faq-item__a {
  margin: 0 15px;
  padding: 12px 0 16px;
  border-top: 1px dashed var(--line-700);
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted-400);
}

.page-faq .faq-item__back {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--signal-500);
  text-decoration: none;
}

.page-faq .faq-item__back:hover,
.page-faq .faq-item__back:focus-visible {
  color: var(--data-400);
  text-decoration: underline;
}

/* ---------- 收藏夹图文 ---------- */
.page-faq .faq-split {
  display: grid;
  gap: var(--gap);
}

.page-faq .faq-figure {
  margin: 0;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-faq .faq-figure figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted-400);
}

/* ---------- 收尾 CTA ---------- */
.page-faq .faq-cta {
  display: grid;
  gap: 16px;
  padding: clamp(20px, 3.2vw, 34px);
  border: 1px solid var(--wine-800);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--wine-800) 0%, var(--panel-800) 100%);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-cta h2 {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1.2;
  letter-spacing: -.01em;
}

.page-faq .faq-cta p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper-050);
  opacity: .82;
  max-width: 52ch;
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq {
    --faq-num: 34px;
    --faq-numgap: 12px;
  }

  .page-faq .faq-item__num {
    font-size: 12px;
  }

  .page-faq .faq-item > summary {
    font-size: 17px;
    padding: 16px 48px 16px 18px;
  }

  .page-faq .faq-item__mark {
    top: 22px;
    right: 20px;
  }

  .page-faq .faq-item__a {
    margin: 0 18px;
    padding-bottom: 18px;
  }
}

@media (min-width: 860px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-board {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: stretch;
  }

  .page-faq .faq-board__media,
  .page-faq .faq-board__media img {
    height: 100%;
  }

  .page-faq .faq-figure img {
    max-height: 380px;
  }
}

@media (min-width: 980px) {
  .page-faq {
    --faq-num: 40px;
    --faq-numgap: 16px;
  }

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-faq .faq-cta__actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item,
  .page-faq .faq-index__chip {
    transition: none;
  }
}