.page-faq {
  --faq-gap: clamp(18px, 3.4vw, 40px);
  background: var(--ff-night);
  color: var(--ff-ink);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding-top: calc(var(--ff-header-h) + 44px);
  padding-bottom: clamp(56px, 7vw, 100px);
}

.page-faq .faq-hero .ff-breadcrumb {
  margin-bottom: clamp(26px, 4vw, 46px);
}

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

.page-faq .faq-hero__kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.24em;
  color: var(--ff-orange);
  margin: 0 0 20px;
}

.page-faq .faq-hero__kicker::before {
  content: "";
  flex: none;
  width: 30px;
  height: 1px;
  background: var(--ff-orange);
}

.page-faq .faq-hero__title {
  font-size: clamp(44px, 9vw, 92px);
  line-height: 0.96;
  letter-spacing: -0.02em;
  margin: 0 0 22px;
}

.page-faq .faq-hero__lead {
  font-family: var(--ff-font-body);
  font-size: var(--ff-fs-3);
  line-height: 1.85;
  color: var(--ff-ink-2);
  max-width: 60ch;
  margin: 0 0 30px;
}

.page-faq .faq-hero__pulse {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin: 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--ff-line);
}

.page-faq .faq-hero__pulse li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: var(--ff-fs-2);
  color: var(--ff-ink-2);
}

.page-faq .faq-hero__pulse .ff-data {
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-5);
  color: var(--ff-ink);
  font-variant-numeric: tabular-nums;
}

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

.page-faq .faq-hero__caption {
  margin-top: 12px;
  font-size: var(--ff-fs-1);
  line-height: 1.7;
  color: var(--ff-gray);
}

/* ---------- 分类索引 ---------- */

.page-faq .faq-taxonomy {
  list-style: none;
  margin: clamp(46px, 7vw, 88px) 0 0;
  padding: 0;
  border-top: 1px solid var(--ff-line);
}

.page-faq .faq-taxonomy__item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 4px 16px;
  align-items: baseline;
  padding: 22px clamp(2px, 1vw, 14px);
  border-bottom: 1px solid var(--ff-line);
  transition: background var(--ff-t) var(--ff-ease), padding-left var(--ff-t) var(--ff-ease);
}

.page-faq .faq-taxonomy__item:hover {
  background: var(--ff-screen);
  padding-left: clamp(10px, 2vw, 24px);
}

.page-faq .faq-taxonomy__num {
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-2);
  letter-spacing: 0.06em;
  color: var(--ff-orange);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-taxonomy__title {
  font-family: var(--ff-font-head);
  font-size: var(--ff-fs-4);
  font-weight: 800;
  line-height: 1.3;
  margin: 0;
  color: var(--ff-ink);
}

.page-faq .faq-taxonomy__desc {
  grid-column: 2;
  margin: 6px 0 0;
  font-size: var(--ff-fs-2);
  line-height: 1.8;
  color: var(--ff-ink-2);
  max-width: 58ch;
}

/* ---------- 高频问答 ---------- */

.page-faq .faq-faqs__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  margin-top: clamp(26px, 4vw, 50px);
}

.page-faq .faq-faqs__list {
  border-top: 1px solid var(--ff-line);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--ff-line);
}

.page-faq .faq-item > .ff-details__summary {
  display: flex;
  align-items: baseline;
  gap: 16px;
  list-style: none;
  cursor: pointer;
  padding: 20px clamp(2px, 1vw, 12px);
}

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

.page-faq .faq-item .ff-details__num {
  flex: none;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.06em;
  color: var(--ff-mist);
  font-variant-numeric: tabular-nums;
  transition: color var(--ff-t) var(--ff-ease);
}

.page-faq .faq-item[open] .ff-details__num,
.page-faq .faq-item:hover .ff-details__num {
  color: var(--ff-orange);
}

.page-faq .faq-item .faq-item__q {
  font-family: var(--ff-font-head);
  font-size: var(--ff-fs-3);
  font-weight: 700;
  line-height: 1.55;
  color: var(--ff-ink);
  transition: color var(--ff-t) var(--ff-ease);
}

.page-faq .faq-item[open] .faq-item__q {
  color: var(--ff-orange-soft);
}

.page-faq .faq-item .ff-details__body {
  padding: 0 clamp(2px, 1vw, 12px) 26px 68px;
}

.page-faq .faq-item .ff-details__body p {
  margin: 0;
  font-size: var(--ff-fs-2);
  line-height: 1.9;
  color: var(--ff-ink-2);
  max-width: 64ch;
}

.page-faq .faq-item .ff-details__body .ff-data {
  font-family: var(--ff-font-data);
  color: var(--ff-green);
  font-variant-numeric: tabular-nums;
  padding: 0 2px;
}

.page-faq .faq-faqs__aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-faq .faq-faqs__aside .ff-note {
  padding: 18px 20px;
  background: var(--ff-board);
  border-radius: var(--ff-radius);
}

.page-faq .faq-faqs__aside .ff-note p {
  margin: 0;
  font-size: var(--ff-fs-2);
  line-height: 1.85;
  color: var(--ff-ink-2);
}

.page-faq .faq-faqs__panel {
  background: var(--ff-board);
  border: 1px solid var(--ff-line);
  border-radius: var(--ff-radius);
  padding: 22px;
}

.page-faq .faq-faqs__panel h3 {
  margin: 0 0 12px;
  font-family: var(--ff-font-head);
  font-size: var(--ff-fs-3);
  font-weight: 800;
  line-height: 1.4;
  color: var(--ff-ink);
}

.page-faq .faq-faqs__panel ul {
  margin: 0;
  padding-left: 18px;
  font-size: var(--ff-fs-2);
  line-height: 1.9;
  color: var(--ff-ink-2);
}

.page-faq .faq-faqs__panel li + li {
  margin-top: 8px;
}

/* ---------- 口径速查表 ---------- */

.page-faq .faq-metrics__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  margin-top: clamp(24px, 4vw, 46px);
}

.page-faq .faq-metrics__table {
  border: 1px solid var(--ff-line);
  border-radius: var(--ff-radius);
  background: var(--ff-board);
}

.page-faq .faq-metrics__table .ff-table {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
  font-size: var(--ff-fs-2);
}

.page-faq .faq-metrics__table .ff-table th,
.page-faq .faq-metrics__table .ff-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--ff-line);
  vertical-align: top;
}

.page-faq .faq-metrics__table .ff-table thead th {
  font-family: var(--ff-font-head);
  font-weight: 800;
  font-size: var(--ff-fs-1);
  letter-spacing: 0.1em;
  color: var(--ff-ink-2);
  background: var(--ff-screen);
  white-space: nowrap;
}

.page-faq .faq-metrics__table .ff-table tbody th {
  font-family: var(--ff-font-head);
  font-weight: 700;
  color: var(--ff-ink);
  white-space: nowrap;
}

.page-faq .faq-metrics__table .ff-table tbody td {
  color: var(--ff-ink-2);
  line-height: 1.7;
}

.page-faq .faq-metrics__table .ff-table tbody tr:last-child th,
.page-faq .faq-metrics__table .ff-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-faq .faq-metrics__table .ff-table .ff-num {
  font-family: var(--ff-font-data);
  text-align: right;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  color: var(--ff-green);
}

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

/* ---------- 术语表 ---------- */

.page-faq .faq-terms__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin: clamp(24px, 4vw, 46px) 0 0;
  padding: 0;
  border-top: 1px solid var(--ff-line);
}

.page-faq .faq-terms__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 22px clamp(2px, 1vw, 12px);
  border-bottom: 1px solid var(--ff-line);
}

.page-faq .faq-terms__term {
  font-family: var(--ff-font-head);
  font-size: var(--ff-fs-3);
  font-weight: 800;
  line-height: 1.5;
  color: var(--ff-ink);
}

.page-faq .faq-terms__term::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 12px;
  background: var(--ff-orange);
  transform: translateY(-1px) rotate(45deg);
}

.page-faq .faq-terms__def {
  margin: 0;
  font-size: var(--ff-fs-2);
  line-height: 1.9;
  color: var(--ff-ink-2);
  max-width: 64ch;
}

/* ---------- 仍未解决 ---------- */

.page-faq .faq-help__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: clamp(24px, 4vw, 46px);
  padding: clamp(24px, 4vw, 48px);
  background: var(--ff-board);
  border: 1px solid var(--ff-line);
  border-radius: var(--ff-radius);
}

.page-faq .faq-help__lead {
  margin: 0 0 22px;
  font-size: var(--ff-fs-3);
  line-height: 1.85;
  color: var(--ff-ink-2);
  max-width: 60ch;
}

.page-faq .faq-help__links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin: 0;
  padding: 0;
}

.page-faq .faq-help__links a {
  display: inline-block;
  padding-bottom: 4px;
  font-size: var(--ff-fs-2);
  color: var(--ff-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--ff-line);
  transition: color var(--ff-t) var(--ff-ease), border-color var(--ff-t) var(--ff-ease);
}

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

.page-faq .faq-help__contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin: 0;
  padding-top: 26px;
  border-top: 1px solid var(--ff-line);
}

.page-faq .faq-help__contact dt {
  margin-bottom: 8px;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.18em;
  color: var(--ff-gray);
}

.page-faq .faq-help__contact dd {
  margin: 0;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-2);
  line-height: 1.7;
  color: var(--ff-ink);
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

.page-faq .faq-help__contact a {
  color: var(--ff-orange);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--ff-t) var(--ff-ease);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-faq .faq-terms__row {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 30px;
    align-items: baseline;
  }

  .page-faq .faq-help__contact {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .page-faq .faq-item .ff-details__body {
    padding-left: 76px;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(36px, 5vw, 78px);
    align-items: center;
  }

  .page-faq .faq-hero__figure {
    margin-top: 56px;
  }

  .page-faq .faq-taxonomy {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 64px);
  }

  .page-faq .faq-taxonomy__item:nth-last-child(-n+2) {
    border-bottom: 0;
  }

  .page-faq .faq-faqs__grid {
    grid-template-columns: minmax(0, 2.15fr) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 62px);
    align-items: start;
  }

  .page-faq .faq-metrics__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 58px);
    align-items: start;
  }

  .page-faq .faq-help__panel {
    grid-template-columns: minmax(0, 1fr);
    gap: 34px;
    padding: clamp(32px, 4vw, 56px);
  }
}

@media (min-width: 1240px) {
  .page-faq .faq-help__panel {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-help__contact {
    padding-top: 0;
    border-top: 0;
    border-left: 1px solid var(--ff-line);
    padding-left: clamp(26px, 3vw, 46px);
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-taxonomy__item,
  .page-faq .faq-item .ff-details__num,
  .page-faq .faq-item .faq-item__q,
  .page-faq .faq-help__links a,
  .page-faq .faq-help__contact a {
    transition: none;
  }
}