.page-faq {
  --faq-pad: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  padding-top: clamp(20px, 3.5vw, 40px);
  padding-bottom: clamp(32px, 5vw, 56px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -8%;
  width: min(560px, 72vw);
  height: 320px;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(closest-side, #000 18%, transparent 76%);
  mask-image: radial-gradient(closest-side, #000 18%, transparent 76%);
}

.page-faq .faq-hero .display {
  margin: 14px 0 0;
  max-width: 22ch;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.85rem, 4.6vw, 3.35rem);
  line-height: 1.16;
  letter-spacing: 0.015em;
  color: var(--c-text);
  text-wrap: balance;
}

.page-faq .faq-hero .lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-faq .faq-hero .lede a {
  color: var(--c-neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 227, 193, 0.35);
}

.page-faq .faq-hero .lede a:hover,
.page-faq .faq-hero .lede a:focus-visible {
  border-bottom-color: var(--c-neon);
}

/* 首屏三条速览 */

.page-faq .faq-quick {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .faq-quick__item {
  background: var(--c-panel);
}

.page-faq .faq-quick__link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 20px;
  text-decoration: none;
  color: inherit;
  transition: background-color 0.22s ease;
}

.page-faq .faq-quick__link:hover,
.page-faq .faq-quick__link:focus-visible {
  background: var(--c-float);
}

.page-faq .faq-quick__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-gold);
}

.page-faq .faq-quick__text {
  font-size: 0.9375rem;
  line-height: 1.62;
  color: var(--c-muted);
}

.page-faq .faq-quick__link:hover .faq-quick__text,
.page-faq .faq-quick__link:focus-visible .faq-quick__text {
  color: var(--c-text);
}

/* ---------- 主布局 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

/* ---------- 左侧问题索引 ---------- */

.page-faq .faq-index {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--c-ink);
  padding: 20px 18px;
}

.page-faq .faq-index__label {
  margin: 0 0 14px;
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-index__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 10px 10px 14px;
  border-radius: 8px;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--c-muted);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.page-faq .faq-index__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 0;
  border-radius: 2px;
  background: var(--c-neon);
  transform: translateY(-50%);
  transition: height 0.24s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--c-text);
  background: var(--c-float);
}

.page-faq .faq-index__link:hover::before,
.page-faq .faq-index__link:focus-visible::before {
  height: 18px;
}

.page-faq .faq-index__link .num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--c-neon);
}

.page-faq .faq-index__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--c-muted);
}

/* ---------- 右侧答案栏 ---------- */

.page-faq .faq-panel {
  display: grid;
  gap: clamp(18px, 3vw, 26px);
  min-width: 0;
}

.page-faq .faq-group {
  position: relative;
  min-width: 0;
  padding: var(--faq-pad);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--c-ink);
  box-shadow: var(--glow);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-group::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background-image: linear-gradient(to right, var(--grid-line) 1px, transparent 1px);
  background-size: 40px 100%;
  opacity: 0.5;
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 32%);
  mask-image: linear-gradient(180deg, #000, transparent 32%);
}

.page-faq .faq-group > * {
  position: relative;
  z-index: 1;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 16px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--c-neon);
  padding-top: 2px;
}

.page-faq .faq-group__head .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.2rem, 2.1vw, 1.5rem);
  font-weight: 700;
  letter-spacing: 0.025em;
  line-height: 1.35;
  color: var(--c-text);
}

/* ---------- 问答条目 ---------- */

.page-faq .rule-list {
  display: grid;
  min-width: 0;
}

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

.page-faq .rule-item:first-child {
  border-top: 0;
}

.page-faq .rule-item__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  padding: 18px 0 10px;
  background: transparent;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  border-radius: 4px;
}

.page-faq .rule-item__head:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 4px;
}

.page-faq .rule-item__index {
  flex: none;
  min-width: 2.4em;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--c-muted);
}

.page-faq .rule-item__title {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.55;
  letter-spacing: 0.01em;
  color: var(--c-text);
}

.page-faq .rule-item__head:hover .rule-item__title {
  color: var(--c-neon-soft);
}

.page-faq .rule-item__mark {
  flex: none;
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: 6px;
  color: var(--c-neon);
}

.page-faq .rule-item__mark::before,
.page-faq .rule-item__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  border-radius: 2px;
  background: currentColor;
  transform: translate(-50%, -50%);
}

.page-faq .rule-item__mark::before {
  width: 14px;
  height: 1.5px;
}

.page-faq .rule-item__mark::after {
  width: 1.5px;
  height: 14px;
  transition: transform 0.24s ease, opacity 0.24s ease;
}

.page-faq .rule-item[data-open] .rule-item__mark::after,
.page-faq .rule-item .rule-item__head[aria-expanded="true"] .rule-item__mark::after {
  opacity: 0;
  transform: translate(-50%, -50%) scaleY(0.12);
}

.page-faq .rule-item__body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.34s cubic-bezier(0.2, 0.7, 0.3, 1);
}

.page-faq .rule-item[data-open] .rule-item__body,
.page-faq .rule-item .rule-item__head[aria-expanded="true"] + .rule-item__body {
  grid-template-rows: 1fr;
}

.page-faq .rule-item__inner {
  min-height: 0;
  overflow: hidden;
}

.page-faq .rule-item__content {
  padding-bottom: 22px;
  max-width: 66ch;
}

.page-faq .rule-item__content p {
  margin: 0 0 10px;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--c-muted);
}

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

.page-faq .rule-item__content strong {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.9em;
  letter-spacing: 0.02em;
  color: var(--c-neon-soft);
}

/* 相关条目 */

.page-faq .faq-related {
  margin-top: 16px;
  padding: 13px 16px;
  border-left: 2px solid var(--c-neon);
  border-radius: 0 8px 8px 0;
  background: linear-gradient(90deg, rgba(79, 227, 193, 0.07), rgba(79, 227, 193, 0) 72%);
}

.page-faq .faq-related__title {
  margin: 0 0 8px;
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.page-faq .faq-related__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-faq .faq-related__links a {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--c-neon);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.page-faq .faq-related__links a:hover,
.page-faq .faq-related__links a:focus-visible {
  border-bottom-color: currentColor;
}

/* 配图 */

.page-faq .faq-figure {
  margin: 18px 0 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--c-panel);
}

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

.page-faq .faq-figure .media-frame__caption {
  padding: 10px 16px 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--c-muted);
}

/* ---------- 底部入口 ---------- */

.page-faq .faq-foot {
  margin-top: clamp(40px, 6vw, 74px);
  padding: clamp(32px, 5vw, 56px) 0 clamp(38px, 6vw, 64px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(11, 48, 40, 0), rgba(11, 48, 40, 0.72));
}

.page-faq .faq-foot__inner {
  display: grid;
  gap: 22px;
}

.page-faq .faq-foot__copy .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.25rem, 2.4vw, 1.65rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--c-text);
}

.page-faq .faq-foot__copy p {
  margin: 12px 0 0;
  max-width: 54ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-muted);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-faq .rule-item__content {
    padding-left: calc(2.4em + 14px);
  }

  .page-faq .faq-related,
  .page-faq .faq-figure {
    margin-top: 18px;
  }
}

@media (min-width: 720px) {
  .page-faq .faq-quick {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-quick__link {
    flex-direction: column;
    gap: 10px;
    padding: 22px 22px 24px;
    height: 100%;
  }
}

@media (min-width: 820px) {
  .page-faq .faq-foot__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 40px;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-layout {
    grid-template-columns: 286px minmax(0, 1fr);
    gap: 56px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding: 22px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-quick__link,
  .page-faq .faq-index__link,
  .page-faq .faq-index__link::before,
  .page-faq .rule-item__body,
  .page-faq .rule-item__mark::after,
  .page-faq .faq-related__links a {
    transition: none;
  }
}