.page-faq {
  --faq-index-w: 236px;
  --faq-gap: 48px;
}

.page-faq .faq-crumb {
  padding-top: 22px;
}

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 1px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-block: clamp(32px, 5vw, 64px) clamp(36px, 5vw, 72px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--fog);
}

.page-faq .faq-hero__title {
  margin: 0 0 22px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 44px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--white);
  max-width: 18em;
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--fog);
}

.page-faq .faq-stats {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-stats__item {
  background: var(--ink);
  padding: 18px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-faq .faq-stats__num {
  font-size: 30px;
  line-height: 1;
  font-weight: 700;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-stats__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--fog);
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  padding-block: clamp(40px, 6vw, 80px) clamp(48px, 7vw, 96px);
}

.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
}

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

/* ---------- 问题索引 ---------- */
.page-faq .faq-index {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 20px 22px 22px;
}

.page-faq .faq-index__title {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--white);
}

.page-faq .faq-index__group + .faq-index__group {
  margin-top: 24px;
}

.page-faq .faq-index__label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--fog);
}

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

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--step) var(--ease), border-color var(--step) var(--ease);
}

.page-faq .faq-index__link .mono {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--fog);
  font-variant-numeric: tabular-nums;
  transition: color var(--step) var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--line);
}

.page-faq .faq-index__link:hover .mono,
.page-faq .faq-index__link:focus-visible .mono {
  color: var(--cyan);
}

.page-faq .faq-index__hint {
  margin: 24px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: 0.04em;
  color: var(--fog);
}

/* ---------- 分组标题 ---------- */
.page-faq .faq-group {
  margin-bottom: clamp(48px, 7vw, 84px);
}

.page-faq .faq-group:last-of-type {
  margin-bottom: 0;
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
}

.page-faq .faq-group__no {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-faq .faq-group h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 3.6vw, 26px);
  line-height: 1.3;
  color: var(--white);
}

.page-faq .faq-group__desc {
  margin: 0 0 28px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--fog);
}

/* ---------- 问答条目 ---------- */
.page-faq .qa {
  border-top: 1px solid var(--line);
}

.page-faq .qa:last-of-type {
  border-bottom: 1px solid var(--line);
}

.page-faq .qa__summary {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  transition: background-color var(--step) var(--ease);
}

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

.page-faq .qa__summary:hover {
  background-color: var(--paper);
}

.page-faq .qa__no {
  flex: none;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-faq .qa__q {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.6;
  color: var(--white);
}

.page-faq .qa__body {
  padding: 0 0 22px;
}

.page-faq .qa__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--fog);
}

/* ---------- 图 ---------- */
.page-faq .faq-figure {
  margin: 28px 0 32px;
  min-width: 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: 0.04em;
  color: var(--fog);
}

.page-faq .faq-figure--phone {
  max-width: 300px;
}

.page-faq .faq-figure--phone img {
  max-width: 300px;
}

/* ---------- 术语表 ---------- */
.page-faq .glossary {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--line);
}

.page-faq .term {
  padding: 15px 0 16px;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--step) var(--ease);
}

.page-faq .term:hover {
  border-bottom-color: rgba(33, 230, 214, 0.45);
}

.page-faq .term__name {
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-faq .term__def {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fog);
}

/* ---------- 兜底联系块 ---------- */
.page-faq .faq-help {
  margin-top: clamp(48px, 7vw, 84px);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  background: var(--paper);
  padding: clamp(24px, 4vw, 40px);
}

.page-faq .faq-help__title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(20px, 3.2vw, 24px);
  line-height: 1.4;
  color: var(--white);
}

.page-faq .faq-help__text {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--fog);
}

.page-faq .faq-help__contact {
  margin: 0 0 28px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-help__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-help__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--fog);
}

.page-faq .faq-help__value {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--white);
  overflow-wrap: anywhere;
}

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

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .glossary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--faq-gap);
  }

  .page-faq .faq-help__row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

/* ---------- 桌面：索引常驻左栏，1px 竖线贯穿 ---------- */
@media (min-width: 1000px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: 0;
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 80px;
    border: 0;
    border-right: 1px solid var(--line);
    background: transparent;
    padding: 0 32px 8px 0;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }

  .page-faq .faq-main {
    padding-left: var(--faq-gap);
  }

  .page-faq .qa__q {
    font-size: 17px;
  }

  .page-faq .faq-figure--phone {
    margin-top: 32px;
  }
}

@media (min-width: 1240px) {
  .page-faq .faq-main {
    padding-left: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__link,
  .page-faq .qa__summary,
  .page-faq .term {
    transition: none;
  }
}