.page-faq {
  --faq-rail-w: 268px;
  --faq-answer-pad: 52px;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 3.6vw, 40px) 0 clamp(30px, 4.6vw, 52px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 140% at 88% -20%, rgba(72, 224, 210, 0.16) 0%, rgba(10, 15, 18, 0) 54%),
    radial-gradient(90% 120% at -5% 115%, rgba(31, 163, 107, 0.16) 0%, rgba(10, 15, 18, 0) 58%),
    var(--ink);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.45;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 104px);
}

.page-faq .faq-hero .shell {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(24px, 3.4vw, 34px);
}

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

.page-faq .faq-hero__lead .eyebrow {
  display: block;
  margin: 0 0 12px;
  color: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: 0 0 16px;
  max-width: 18ch;
  font-size: clamp(29px, 5.4vw, 52px);
  font-weight: 500;
  line-height: 1.22;
  letter-spacing: 0.012em;
  color: var(--white);
}

.page-faq .faq-hero__desc {
  margin: 0 0 22px;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--body);
}

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

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 10px;
  padding-top: clamp(16px, 2.4vw, 24px);
  border-top: 1px solid var(--line-strong);
  min-width: 0;
}

.page-faq .faq-stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-left: 13px;
  border-left: 1px solid var(--line-strong);
  min-width: 0;
}

.page-faq .faq-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.8vw, 29px);
  line-height: 1;
  letter-spacing: 0.03em;
  color: var(--cyan);
}

.page-faq .faq-stat__unit {
  margin-left: 3px;
  font-size: 0.48em;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-faq .faq-stat__label {
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--muted);
}

@media (min-width: 920px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: end;
  }
  .page-faq .faq-hero__stats {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }
  .page-faq .faq-stat {
    flex-direction: row;
    align-items: baseline;
    gap: 16px;
    padding: 12px 0 12px 16px;
  }
  .page-faq .faq-stat__num {
    flex: 0 0 auto;
    min-width: 92px;
  }
}

/* ---------- 主体分栏 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: clamp(26px, 4vw, 34px);
  padding: clamp(30px, 4.4vw, 52px) 0 clamp(52px, 7vw, 92px);
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
  }
}

/* ---------- 左栏索引 ---------- */
.page-faq .faq-rail {
  min-width: 0;
}

.page-faq .faq-rail__title {
  margin: 0 0 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
}

.page-faq .faq-rail__list a {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  align-items: baseline;
  gap: 8px;
  padding: 9px 10px 9px 8px;
  border-left: 2px solid transparent;
  font-size: 13.5px;
  line-height: 1.55;
  text-decoration: none;
  color: var(--body);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-rail__list a:hover {
  color: var(--white);
  background-color: rgba(243, 247, 246, 0.05);
}

.page-faq .faq-rail__list a[data-active="true"] {
  border-left-color: var(--cyan);
  color: var(--white);
  background-color: rgba(72, 224, 210, 0.08);
}

.page-faq .faq-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .faq-rail__foot {
  margin-top: 20px;
  padding: 16px 0 0 16px;
  border-top: 1px solid var(--line);
  border-left: 2px solid var(--pit);
}

.page-faq .faq-rail__foot p {
  margin: 0 0 12px;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--muted);
}

@media (min-width: 1000px) {
  .page-faq .faq-rail__inner {
    position: sticky;
    top: 96px;
  }
  .page-faq .faq-rail__list {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- 分组 ---------- */
.page-faq .faq-answers {
  display: grid;
  gap: clamp(38px, 5vw, 66px);
  min-width: 0;
}

.page-faq .faq-group {
  min-width: 0;
  scroll-margin-top: 132px;
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding-bottom: 13px;
  margin-bottom: 2px;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-group__no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-faq .faq-group__desc {
  flex: 1 1 100%;
  margin: 0;
  max-width: 62ch;
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  position: relative;
  border-bottom: 1px solid var(--line);
  border-left: 2px solid transparent;
  transition: border-left-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .qa[open] {
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, rgba(72, 224, 210, 0.075), rgba(72, 224, 210, 0) 72%);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 17px 8px 17px 14px;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 500;
  line-height: 1.55;
  color: var(--white);
  transition: color var(--dur) var(--ease);
}

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

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

.page-faq .qa__q:hover {
  color: var(--cyan);
}

.page-faq .qa__no {
  flex: 0 0 26px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

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

.page-faq .qa__icon {
  position: relative;
  flex: 0 0 16px;
  width: 16px;
  height: 16px;
  margin-top: 5px;
  margin-left: auto;
}

.page-faq .qa__icon::before,
.page-faq .qa__icon::after {
  content: "";
  position: absolute;
  background: var(--muted);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .qa__icon::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 1px;
}

.page-faq .qa__icon::after {
  left: 7px;
  top: 0;
  width: 1px;
  height: 16px;
}

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

.page-faq .qa[open] .qa__icon::before {
  background: var(--cyan);
}

.page-faq .qa__a {
  padding: 0 clamp(14px, 3vw, 30px) 21px var(--faq-answer-pad);
  font-size: 14.5px;
  line-height: 1.88;
  color: var(--body);
}

.page-faq .qa__a p {
  margin: 0 0 10px;
}

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

/* ---------- 图 ---------- */
.page-faq .faq-figure {
  margin: 20px 0 2px;
}

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

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.75;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* ---------- 尾部 ---------- */
.page-faq .faq-tail {
  border-top: 1px solid var(--line-strong);
  background:
    radial-gradient(80% 130% at 90% 0%, rgba(31, 163, 107, 0.16) 0%, rgba(10, 15, 18, 0) 62%),
    linear-gradient(180deg, rgba(15, 42, 34, 0.72) 0%, rgba(10, 15, 18, 0) 100%);
}

.page-faq .faq-tail__inner {
  display: grid;
  gap: 22px;
  padding: clamp(34px, 5vw, 58px) 0 clamp(46px, 6.4vw, 78px);
}

.page-faq .faq-tail__title {
  margin: 0 0 12px;
  font-size: clamp(21px, 3.2vw, 32px);
  font-weight: 500;
  line-height: 1.34;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-faq .faq-tail__desc {
  margin: 0 0 14px;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--body);
}

.page-faq .faq-tail__links {
  margin: 0;
  max-width: 62ch;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-tail__links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(72, 224, 210, 0.4);
  padding-bottom: 1px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq .faq-tail__links a:hover {
  color: var(--white);
  border-bottom-color: var(--white);
}

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

@media (min-width: 860px) {
  .page-faq .faq-tail__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(30px, 4vw, 56px);
  }
  .page-faq .faq-tail__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 560px) {
  .page-faq .faq-rail__list {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-faq .faq-rail__foot {
    padding-left: 12px;
  }
  .page-faq .qa__q {
    padding: 15px 6px 15px 11px;
    gap: 10px;
    font-size: 15px;
  }
  .page-faq .qa__no {
    flex: 0 0 22px;
    font-size: 11px;
  }
  .page-faq .qa__a {
    padding: 0 14px 18px 44px;
    font-size: 14px;
  }
  .page-faq .faq-hero__actions .btn,
  .page-faq .faq-tail__actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__q,
  .page-faq .qa__icon::before,
  .page-faq .qa__icon::after,
  .page-faq .faq-rail__list a,
  .page-faq .faq-tail__links a {
    transition: none;
  }
}