.page-faq {
  --faq-rule: 2px solid var(--turf);
  --faq-soft: rgba(246, 244, 236, 0.8);
  --faq-dim: rgba(110, 138, 124, 0.55);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: calc(var(--head-offset) + 28px) 0 clamp(40px, 6vw, 78px);
  border-bottom: var(--faq-rule);
  background:
    radial-gradient(110% 85% at 82% 4%, rgba(198, 255, 61, 0.12), transparent 58%),
    linear-gradient(180deg, var(--ink-deep) 0%, var(--ink) 100%);
}

.page-faq .crumbs {
  margin-bottom: clamp(24px, 3.4vw, 44px);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .crumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

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

.page-faq .crumbs__sep {
  margin: 0 8px;
  color: var(--turf);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4.4vw, 58px);
  align-items: end;
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-faq .faq-hero__title {
  margin: 0 0 clamp(20px, 2.4vw, 30px);
  font-size: clamp(32px, 5.2vw, 72px);
  font-weight: 300;
  line-height: 1.16;
  letter-spacing: 0.02em;
  max-width: 20ch;
}

.page-faq .faq-hero__lede {
  margin: 0 0 clamp(28px, 3.4vw, 44px);
  max-width: 46ch;
  font-size: clamp(15.5px, 1.15vw, 17.5px);
  line-height: 1.85;
  color: var(--faq-soft);
}

.page-faq .faq-hero__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 18px 26px;
  margin: 0;
  padding-top: 22px;
  border-top: var(--faq-rule);
}

.page-faq .faq-hero__metaitem dt {
  margin-bottom: 6px;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-faq .faq-hero__metaitem dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--paper);
}

.page-faq .num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--lime);
}

/* ---------- 图片容器 ---------- */

.page-faq .faq-fig {
  margin: 0;
  border: var(--faq-rule);
  background: var(--ink-deep);
  box-shadow: var(--shadow-brutal);
  overflow: hidden;
}

.page-faq .faq-fig img {
  display: block;
  width: 100%;
  height: auto;
  transition: filter var(--ease);
  filter: saturate(0.88) contrast(1.06);
}

.page-faq .faq-hero__fig {
  aspect-ratio: 4 / 3;
}

.page-faq .faq-hero__fig img {
  height: 100%;
  object-fit: cover;
}

.page-faq .faq-hero__fig:hover img {
  filter: saturate(1) contrast(1.1);
}

/* ---------- 主体两栏 ---------- */

.page-faq .faq-body {
  padding: clamp(44px, 5.6vw, 84px) 0 clamp(52px, 6.4vw, 96px);
}

.page-faq .faq-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 46px);
}

/* ---------- 左侧索引 ---------- */

.page-faq .faq-index__head {
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: var(--faq-rule);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

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

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 15px;
  border: 2px solid var(--turf);
  color: var(--paper);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  outline: none;
  color: var(--lime);
  border-color: var(--lime);
  background: rgba(198, 255, 61, 0.06);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--lime);
}

/* ---------- 右侧答案堆叠 ---------- */

.page-faq .faq-group + .faq-group {
  margin-top: clamp(40px, 5vw, 68px);
  padding-top: clamp(36px, 4.4vw, 58px);
  border-top: 2px solid var(--turf);
}

.page-faq .faq-group__title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 10px;
  font-size: clamp(19px, 2.1vw, 27px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.page-faq .faq-group__title .idx {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-faq .faq-group__sub {
  margin: 0 0 clamp(22px, 2.6vw, 34px);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 折叠面板 ---------- */

.page-faq .faq-item {
  position: relative;
  padding-left: 20px;
  border-bottom: 1px solid var(--turf);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 0;
  background: var(--lime);
  transition: height 220ms ease;
}

.page-faq .faq-item[open]::before {
  height: 100%;
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 0;
  font-size: clamp(15.5px, 1.4vw, 18.5px);
  font-weight: 600;
  line-height: 1.6;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
  transition: color var(--ease);
}

.page-faq .faq-item > summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item > summary::marker {
  content: "";
}

.page-faq .faq-item > summary:hover {
  color: var(--lime);
}

.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 4px;
}

.page-faq .faq-mark {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  margin-top: 6px;
}

.page-faq .faq-mark::before,
.page-faq .faq-mark::after {
  content: "";
  position: absolute;
  background: var(--lime);
  transition: transform var(--ease), opacity var(--ease);
}

.page-faq .faq-mark::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-faq .faq-mark::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

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

.page-faq .faq-answer {
  max-width: 64ch;
  padding: 0 0 26px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--faq-soft);
}

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

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

.page-faq .faq-answer .num {
  color: var(--lime);
}

/* ---------- 号码区间图 ---------- */

.page-faq .faq-fig--ranges {
  margin-top: clamp(26px, 3vw, 40px);
}

.page-faq .faq-fig__cap {
  padding: 14px 18px;
  border-top: var(--faq-rule);
  background: var(--ink-deep);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 联系块 ---------- */

.page-faq .faq-contact {
  margin-top: clamp(28px, 3.2vw, 44px);
  padding: clamp(22px, 2.6vw, 32px);
  border: var(--faq-rule);
  background: linear-gradient(160deg, var(--ink-deep) 0%, var(--ink) 100%);
  box-shadow: var(--shadow-brutal);
}

.page-faq .faq-contact__intro {
  margin: 0 0 20px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
}

.page-faq .faq-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  padding: 14px 0;
  border-top: 1px solid var(--turf);
}

.page-faq .faq-contact__key {
  flex: 0 0 auto;
  min-width: 74px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-faq .faq-contact__val {
  flex: 1 1 auto;
  font-family: var(--font-mono);
  font-size: 15px;
  font-variant-numeric: tabular-nums;
  color: var(--lime-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.page-faq .faq-contact__val:hover,
.page-faq .faq-contact__val:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-faq .faq-contact__note {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--turf);
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 底部快捷入口 ---------- */

.page-faq .faq-shortcuts {
  padding: clamp(34px, 4vw, 56px) 0 clamp(44px, 5vw, 72px);
  border-top: var(--faq-rule);
  background: var(--ink-deep);
}

.page-faq .faq-shortcuts__label {
  margin: 0 0 20px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-faq .faq-shortcuts__list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-shortcuts__link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 13px 20px;
  border: 2px solid var(--turf);
  color: var(--paper);
  font-size: 14.5px;
  text-decoration: none;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-faq .faq-shortcuts__link:hover,
.page-faq .faq-shortcuts__link:focus-visible {
  outline: none;
  color: var(--lime);
  border-color: var(--lime);
  background: rgba(198, 255, 61, 0.07);
}

.page-faq .faq-shortcuts__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--lime);
}

/* ---------- 桌面端 ---------- */

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  }

  .page-faq .faq-body__grid {
    grid-template-columns: 252px minmax(0, 1fr);
    gap: 0;
  }

  .page-faq .faq-index {
    align-self: start;
    position: sticky;
    top: calc(var(--head-offset) + 20px);
    padding-right: 30px;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

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

  .page-faq .faq-index__link {
    padding: 13px 0;
    border: 0;
    border-bottom: 1px solid var(--turf);
    white-space: normal;
    background: none;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    background: none;
    border-bottom-color: var(--lime);
    padding-left: 6px;
  }

  .page-faq .faq-answers {
    border-left: var(--faq-rule);
    padding-left: clamp(30px, 4vw, 56px);
  }
}

/* ---------- 中屏微调 ---------- */

@media (min-width: 640px) and (max-width: 899px) {
  .page-faq .faq-hero__title {
    max-width: 24ch;
  }

  .page-faq .faq-hero__fig {
    aspect-ratio: 16 / 9;
  }
}

/* ---------- 减弱动效偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item::before,
  .page-faq .faq-mark::before,
  .page-faq .faq-mark::after,
  .page-faq .faq-index__link,
  .page-faq .faq-shortcuts__link {
    transition: none;
  }
}