.page-faq {
  --faq-rail: 14px;
  --faq-idx-w: 42px;
  --faq-q-gap: 12px;
  --faq-answer-offset: 0px;
  display: block;
  background: var(--ink-black);
  color: var(--chalk);
}

@media (min-width: 720px) {
  .page-faq {
    --faq-idx-w: 52px;
    --faq-q-gap: 20px;
    --faq-answer-offset: calc(var(--faq-rail) + var(--faq-idx-w) + var(--faq-q-gap));
  }
}

.page-faq .faq-wrap {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  box-sizing: border-box;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding: 32px 0 52px;
  border-bottom: 1px solid var(--crease);
  background:
    radial-gradient(circle at 90% 6%, rgba(53, 242, 208, 0.12), transparent 44%),
    linear-gradient(180deg, var(--deep-green) 0%, var(--ink-black) 100%);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: center;
}

@media (min-width: 960px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }
}

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

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 6vw, 54px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--body-dim);
}

@media (min-width: 720px) {
  .page-faq .faq-hero__lead {
    font-size: 17px;
  }
}

.page-faq .faq-hero__topics {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__topics li {
  position: relative;
  padding-left: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-faq .faq-hero__topics li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 1px;
  background: var(--neon-cyan);
  transform: translateY(-50%);
}

.page-faq .faq-hero__media {
  margin: 0;
  min-width: 0;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--crease);
  filter: saturate(0.82) contrast(1.06);
}

/* ---------- 问答主体 ---------- */

.page-faq .faq-board {
  padding: 56px 0 8px;
}

.page-faq .faq-board__head {
  max-width: 56ch;
  margin-bottom: 34px;
}

.page-faq .faq-board__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 34px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-faq .faq-board__head p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-item {
  border-top: 1px solid var(--crease);
}

.page-faq .faq-item:last-child {
  border-bottom: 1px solid var(--crease);
}

.page-faq .faq-q {
  position: relative;
  display: grid;
  grid-template-columns: var(--faq-idx-w) minmax(0, 1fr) 16px;
  align-items: start;
  gap: 0 var(--faq-q-gap);
  padding: 24px 0 24px var(--faq-rail);
  cursor: pointer;
  list-style: none;
  transition: background-color var(--dur) var(--ease);
}

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

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

@media (min-width: 720px) {
  .page-faq .faq-q {
    padding: 30px 0 30px var(--faq-rail);
  }
}

.page-faq .faq-q:hover {
  background-color: rgba(53, 242, 208, 0.045);
}

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

.page-faq .faq-q::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 22px;
  width: 3px;
  background: var(--neon-cyan);
  opacity: 0;
  transform: scaleY(0.3);
  transform-origin: 50% 0;
  transition: opacity 160ms var(--ease), transform 160ms var(--ease);
}

.page-faq details[open] > .faq-q::before {
  opacity: 1;
  transform: scaleY(1);
}

.page-faq .faq-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--faq-idx-w);
  height: var(--faq-idx-w);
  box-sizing: border-box;
  border: 1px solid var(--crease);
  background: var(--pitch-green);
  color: var(--neon-cyan);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

@media (min-width: 720px) {
  .page-faq .faq-num {
    font-size: 15px;
  }
}

.page-faq details[open] > .faq-q .faq-num {
  border-color: var(--neon-cyan);
  background: var(--neon-cyan);
  color: var(--ink-black);
}

.page-faq .faq-q__text {
  min-width: 0;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--chalk);
  transition: color var(--dur) var(--ease);
}

@media (min-width: 720px) {
  .page-faq .faq-q__text {
    font-size: 19px;
  }
}

.page-faq details[open] > .faq-q .faq-q__text {
  color: var(--neon-cyan);
}

.page-faq .faq-caret {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 12px;
  justify-self: end;
}

.page-faq .faq-caret::before,
.page-faq .faq-caret::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 14px;
  height: 1px;
  background: var(--mist);
  transition: transform 160ms var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-caret::after {
  transform: rotate(90deg);
}

.page-faq details[open] > .faq-q .faq-caret::after {
  transform: rotate(0deg);
}

.page-faq details[open] > .faq-q .faq-caret::before,
.page-faq details[open] > .faq-q .faq-caret::after {
  background: var(--neon-cyan);
}

.page-faq .faq-a {
  padding: 0 0 26px 0;
}

@media (min-width: 720px) {
  .page-faq .faq-a {
    padding: 0 32px 30px var(--faq-answer-offset);
  }
}

.page-faq .faq-a p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--body-dim);
}

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

.page-faq .faq-a a {
  color: var(--neon-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 208, 0.45);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.page-faq .faq-figure {
  font-family: var(--font-mono);
  font-size: 1.28em;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  color: var(--warm-orange);
  padding: 0 2px;
}

@keyframes faqAnswerIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-faq details[open] > .faq-a {
  animation: faqAnswerIn 160ms var(--ease) both;
}

/* ---------- 收尾引导 ---------- */

.page-faq .faq-help {
  margin-top: 44px;
  padding: 50px 0 72px;
  border-top: 1px solid var(--crease);
  background:
    radial-gradient(circle at 8% 20%, rgba(53, 242, 208, 0.1), transparent 42%),
    linear-gradient(180deg, var(--deep-green) 0%, var(--ink-black) 100%);
}

.page-faq .faq-help__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: center;
}

@media (min-width: 860px) {
  .page-faq .faq-help__grid {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: 56px;
  }
}

.page-faq .faq-help__media {
  margin: 0;
  max-width: 320px;
}

.page-faq .faq-help__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--crease);
}

.page-faq .faq-help h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-faq .faq-help p {
  margin: 0 0 22px;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--body-dim);
}

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

.page-faq .faq-help__actions .btn {
  text-decoration: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-q,
  .page-faq .faq-q::before,
  .page-faq .faq-num,
  .page-faq .faq-caret::before,
  .page-faq .faq-caret::after,
  .page-faq .faq-a a {
    transition: none;
  }

  .page-faq details[open] > .faq-a {
    animation: none;
  }
}