.page-faq {
  --faq-idx-w: 236px;
  --faq-ring: rgba(53, 230, 255, 0.08);
}

/* ---------- 首屏 ---------- */
.page-faq .crumbs {
  padding-top: 22px;
}

.page-faq .faq-hero {
  position: relative;
  padding: clamp(24px, 4vw, 44px) 0 clamp(22px, 3.4vw, 36px);
  border-bottom: 1px solid var(--line);
  background-image:
    radial-gradient(ellipse 58% 130% at 90% 0%, rgba(124, 92, 255, 0.18), transparent 70%),
    radial-gradient(ellipse 52% 110% at 8% 12%, rgba(53, 230, 255, 0.10), transparent 68%);
  background-repeat: no-repeat;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: clamp(72px, 16vw, 190px);
  height: 2px;
  background: linear-gradient(90deg, var(--neon), var(--violet));
}

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

.page-faq .faq-title {
  margin: 14px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(29px, 4.4vw, 52px);
  line-height: 1.18;
  letter-spacing: 0.01em;
  color: var(--text);
  transform: scaleX(1.015);
  transform-origin: left top;
}

.page-faq .faq-lede {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: 16.5px;
  line-height: 1.82;
  color: var(--muted);
}

.page-faq .faq-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.page-faq .faq-stats li {
  display: flex;
  align-items: baseline;
  gap: 7px;
}

.page-faq .faq-stats .mono {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.01em;
}

/* ---------- 双栏骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
  padding: clamp(26px, 4.4vw, 52px) 0 clamp(40px, 7vw, 88px);
}

.page-faq .faq-index {
  position: static;
  min-width: 0;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .toc {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-top: 1px solid var(--line);
}

.page-faq .toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 8px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-faq .toc__link .mono {
  font-size: 11px;
  color: var(--violet);
  transition: color 0.18s ease;
}

.page-faq .toc__link:hover,
.page-faq .toc__link:focus-visible {
  color: var(--text);
  background-color: var(--faq-ring);
  border-left-color: rgba(53, 230, 255, 0.45);
}

.page-faq .toc__link:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: -2px;
}

.page-faq .toc__link[aria-current="true"] {
  color: var(--text);
  border-left-color: var(--neon);
  background-color: var(--faq-ring);
}

.page-faq .toc__link[aria-current="true"] .mono {
  color: var(--neon);
}

.page-faq .faq-stream {
  min-width: 0;
}

/* ---------- 分节 ---------- */
.page-faq .faq-block {
  scroll-margin-top: calc(var(--calbar-h) + 26px);
  padding-bottom: clamp(30px, 4.6vw, 52px);
}

.page-faq .faq-block + .faq-block {
  border-top: 1px solid var(--line);
  padding-top: clamp(30px, 4.6vw, 52px);
}

.page-faq .sec-head {
  margin-bottom: 10px;
}

.page-faq .sec-head__idx {
  color: var(--neon);
}

.page-faq .sec-head__title {
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.32;
}

.page-faq .faq-block__note {
  margin: 0 0 20px;
  max-width: 62ch;
  padding-left: 12px;
  border-left: 2px solid var(--violet);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-q {
  border-top: 1px solid var(--line);
  transition: background-color 0.2s ease;
}

.page-faq .faq-q:last-of-type {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-q:hover {
  background-color: rgba(19, 28, 51, 0.55);
}

.page-faq .faq-q__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  padding: 18px 8px;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: var(--text);
  font-family: var(--font-body);
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 500;
  line-height: 1.55;
  transition: color 0.18s ease;
}

.page-faq .faq-q__head:hover {
  color: var(--neon);
}

.page-faq .faq-q__head:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: -2px;
}

.page-faq .q-no {
  flex: 0 0 auto;
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--violet);
  transition: color 0.18s ease;
}

.page-faq .faq-q__head[aria-expanded="true"] .q-no {
  color: var(--neon);
}

.page-faq .q-text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .q-caret {
  flex: 0 0 auto;
  position: relative;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  border: 1px solid var(--line);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-faq .q-caret::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 46%;
  width: 6px;
  height: 6px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: translate(-50%, -60%) rotate(45deg);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-q__head:hover .q-caret {
  border-color: var(--neon);
}

.page-faq .faq-q__head[aria-expanded="true"] .q-caret {
  border-color: var(--neon);
  background-color: rgba(53, 230, 255, 0.12);
}

.page-faq .faq-q__head[aria-expanded="true"] .q-caret::before {
  border-color: var(--neon);
  transform: translate(-50%, -30%) rotate(-135deg);
}

.page-faq .faq-q__body {
  max-width: 68ch;
  padding: 0 8px 22px 44px;
}

/* ---------- 答案排版 ---------- */
.page-faq .answer__lead {
  margin: 0 0 8px;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.75;
  color: var(--text);
}

.page-faq .answer__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--muted);
}

.page-faq .answer__steps {
  margin: 10px 0 8px;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.page-faq .answer__steps li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 6px;
  counter-increment: step;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .answer__steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--neon);
}

.page-faq .answer__steps li:last-child {
  margin-bottom: 0;
}

/* ---------- 图与纸片块 ---------- */
.page-faq .faq-figure {
  margin: 4px 0 24px;
}

.page-faq .faq-figure--narrow {
  max-width: 560px;
}

.page-faq .faq-paper {
  margin: 0 0 22px;
  padding: 20px 22px;
  background-color: var(--paper);
  color: #0B1122;
  border-left: 4px solid var(--violet);
}

.page-faq .faq-paper__lead {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.9vw, 21px);
  font-weight: 700;
  line-height: 1.4;
  color: #05070F;
}

.page-faq .faq-paper__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: #2A3450;
}

.page-faq .note {
  margin-top: 8px;
}

/* ---------- 收尾行动 ---------- */
.page-faq .faq-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 24px;
  margin-top: 24px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(53, 230, 255, 0.08), rgba(124, 92, 255, 0.10) 62%, transparent 100%);
}

.page-faq .faq-cta__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
}

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

/* ---------- 窄屏 ---------- */
@media (max-width: 959px) {
  .page-faq .faq-index__title {
    margin-bottom: 8px;
  }

  .page-faq .toc {
    flex-direction: row;
    gap: 6px;
    overflow-x: auto;
    border-top: 0;
    border-bottom: 1px solid var(--line);
    padding-bottom: 10px;
    scrollbar-width: thin;
    -webkit-overflow-scrolling: touch;
  }

  .page-faq .toc__link {
    flex: 0 0 auto;
    border-left: 0;
    border-bottom: 2px solid transparent;
    padding: 8px 12px;
    white-space: nowrap;
  }

  .page-faq .toc__link:hover,
  .page-faq .toc__link:focus-visible {
    border-left-color: transparent;
    border-bottom-color: rgba(53, 230, 255, 0.45);
  }

  .page-faq .toc__link[aria-current="true"] {
    border-left-color: transparent;
    border-bottom-color: var(--neon);
  }
}

@media (max-width: 600px) {
  .page-faq .faq-q__body {
    padding-left: 8px;
  }

  .page-faq .faq-q__head {
    padding: 16px 6px;
    gap: 10px;
  }

  .page-faq .faq-title {
    transform: none;
    max-width: none;
  }

  .page-faq .faq-stats {
    gap: 8px 20px;
  }

  .page-faq .faq-cta {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-faq .faq-cta__actions {
    width: 100%;
  }
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 960px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-idx-w) minmax(0, 1fr);
    gap: clamp(32px, 4.6vw, 68px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--calbar-h) + 28px);
    align-self: start;
    max-height: calc(100vh - var(--calbar-h) - 56px);
    overflow-y: auto;
  }
}