.page-faq {
  --faq-indent: clamp(16px, 3vw, 24px);
  padding-bottom: clamp(56px, 7vw, 112px);
}

.page-faq .faq-hero {
  padding: clamp(32px, 5vw, 72px) 0 clamp(32px, 5vw, 64px);
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-hero__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(42px, 8vw, 108px);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--c-text);
}

.page-faq .faq-hero__foot {
  display: grid;
  gap: 24px;
  margin-top: clamp(26px, 4vw, 52px);
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 64ch;
  color: var(--c-text);
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.78;
}

.page-faq .faq-hero__note {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
  border-left: 2px solid var(--c-cyan);
  padding-left: 14px;
  align-self: end;
}

.page-faq .faq-layout {
  display: grid;
  gap: clamp(32px, 4vw, 56px);
  padding-top: clamp(32px, 5vw, 64px);
}

/* 分类索引 */
.page-faq .faq-index {
  border-top: 1px solid var(--c-line);
  padding-top: 18px;
}

.page-faq .faq-index__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-faq .faq-index__list li { flex: 0 0 auto; }

.page-faq .faq-index__list a {
  display: grid;
  grid-template-columns: auto auto;
  gap: 8px;
  align-items: baseline;
  padding: 12px 18px 12px 0;
  color: var(--c-muted);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-index__list a:hover { color: var(--c-orange); }

.page-faq .faq-index__list a.is-active {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.page-faq .faq-index__list .index-num {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: inherit;
}

/* 问答主体 */
.page-faq .faq-answers {
  min-width: 0;
}

.page-faq .qa-group {
  margin-bottom: clamp(44px, 6vw, 80px);
  scroll-margin-top: 104px;
}

.page-faq .qa-group:last-of-type { margin-bottom: clamp(32px, 4vw, 56px); }

.page-faq .qa-group__head {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  column-gap: 14px;
  padding-bottom: 20px;
}

.page-faq .qa-group__head .index-num {
  grid-row: 1 / span 2;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
  padding-top: 6px;
}

.page-faq .qa-group__head .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.8vw, 34px);
  line-height: 1.2;
  color: var(--c-text);
}

.page-faq .qa-group__desc {
  grid-column: 2;
  margin: 10px 0 0;
  color: var(--c-muted);
  font-size: 14.5px;
  line-height: 1.7;
}

.page-faq .qa-group__list {
  border-bottom: 1px solid var(--c-line);
}

.page-faq .qa {
  border-top: 1px solid var(--c-line);
}

.page-faq .qa > summary {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 400;
  line-height: 1.48;
  color: var(--c-text);
  transition: color 0.2s ease;
}

.page-faq .qa > summary::-webkit-details-marker { display: none; }
.page-faq .qa > summary::marker { content: ""; }
.page-faq .qa > summary:hover { color: var(--c-orange); }
.page-faq .qa[open] > summary { color: var(--c-cyan); }

.page-faq .qa__q { flex: 1 1 auto; }

.page-faq .qa__sign {
  flex: 0 0 auto;
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 7px;
  margin-left: auto;
  color: currentColor;
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.page-faq .qa__sign::before {
  left: 0;
  top: 8px;
  width: 18px;
  height: 1.5px;
}

.page-faq .qa__sign::after {
  left: 8.25px;
  top: 0;
  width: 1.5px;
  height: 18px;
}

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

.page-faq .qa__body {
  max-width: 68ch;
  padding: 0 0 24px 0;
}

.page-faq .qa[open] .qa__body {
  padding-left: var(--faq-indent);
  border-left: 2px solid var(--c-cyan-dim);
}

.page-faq .qa__body p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-text);
}

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

.page-faq .qa__body a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--c-cyan-dim);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-faq .qa__body a:hover {
  color: var(--c-orange);
  border-bottom-color: var(--c-orange);
}

/* 步骤 */
.page-faq .steps {
  list-style: none;
  counter-reset: faq-step;
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
}

.page-faq .steps > li {
  counter-increment: faq-step;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 14px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-text);
}

.page-faq .steps > li::before {
  content: counter(faq-step, decimal-leading-zero);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  margin-top: 1px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--c-deep);
  background: var(--c-cyan);
}

@keyframes faqStepRise {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

.page-faq .qa[open] .steps > li {
  animation: faqStepRise 0.34s ease both;
}

.page-faq .qa[open] .steps > li:nth-child(2) { animation-delay: 0.06s; }
.page-faq .qa[open] .steps > li:nth-child(3) { animation-delay: 0.12s; }
.page-faq .qa[open] .steps > li:nth-child(4) { animation-delay: 0.18s; }
.page-faq .qa[open] .steps > li:nth-child(5) { animation-delay: 0.24s; }

/* 图 */
.page-faq .qa__figure {
  margin: 20px 0 0;
  border: 1px solid var(--c-line);
  max-width: 100%;
}

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

.page-faq .qa__figure .media-frame__caption {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--c-muted);
}

/* 收口条 */
.page-faq .faq-callout {
  margin-top: clamp(36px, 5vw, 64px);
  padding: clamp(26px, 4vw, 44px);
  background: var(--grad-water);
  border: 1px solid var(--c-line);
  display: grid;
  gap: 22px;
}

.page-faq .faq-callout__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.6vw, 30px);
  line-height: 1.25;
  color: var(--c-text);
}

.page-faq .faq-callout__text {
  margin: 0;
  max-width: 54ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-text);
}

.page-faq .faq-callout__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 800px) {
  .page-faq .faq-hero__foot {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: 32px;
  }

  .page-faq .faq-callout {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }

  .page-faq .faq-callout__actions { flex-wrap: nowrap; }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 80px);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-index__list {
    display: block;
    overflow: visible;
  }

  .page-faq .faq-index__list li { display: block; }

  .page-faq .faq-index__list a {
    grid-template-columns: 34px minmax(0, 1fr);
    align-items: baseline;
    white-space: normal;
    padding: 13px 0;
    border-bottom: 1px solid var(--c-line);
  }

  .page-faq .faq-index__list a.is-active {
    border-bottom-color: var(--c-cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa[open] .steps > li { animation: none; }
  .page-faq .qa__sign::before,
  .page-faq .qa__sign::after { transition: none; }
}