/* ===== 使用指南 / page-faq ===== */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(28px, 6vw, 54px) clamp(42px, 7vw, 68px);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 10px;
  background-image: repeating-linear-gradient(
    to right,
    var(--rule-ink) 0 1px,
    transparent 1px 14px
  );
}

.page-faq .faq-crumb {
  margin-bottom: 22px;
  color: var(--on-ink-soft);
  font-size: 13px;
}

.page-faq .faq-crumb a {
  color: var(--on-ink-soft);
  text-decoration: none;
  transition: color 160ms var(--ease);
}

.page-faq .faq-crumb a:hover,
.page-faq .faq-crumb a:focus-visible {
  color: var(--signal);
}

.page-faq .faq-hero__kicker {
  color: var(--celadon);
  margin-bottom: 14px;
}

.page-faq .faq-hero__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(28px, 7.4vw, 46px);
  line-height: 1.16;
  letter-spacing: -0.005em;
  color: var(--on-ink);
  max-width: 22ch;
  margin: 0;
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--on-ink-soft);
}

.page-faq .faq-hero__facts {
  list-style: none;
  margin: 32px 0 0;
  padding: 20px 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  border-top: 1px solid var(--rule-ink);
}

.page-faq .faq-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-faq .faq-hero__facts .mono {
  font-size: clamp(20px, 5.6vw, 26px);
  line-height: 1;
  color: var(--signal);
}

.page-faq .faq-hero__facts span:last-child {
  font-size: clamp(11.5px, 3.2vw, 13px);
  line-height: 1.55;
  color: var(--on-ink-soft);
}

/* --- 问题索引 --- */

.page-faq .faq-index-sec {
  padding-block: clamp(34px, 6vw, 56px);
  border-bottom: 1px solid var(--rule);
}

.page-faq .faq-index__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(20px, 4.8vw, 28px);
  line-height: 1.2;
  color: var(--ink-800);
  margin: 0 0 8px;
}

.page-faq .faq-index__sub {
  margin: 0 0 22px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-faq .faq-index__item {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr) auto;
  grid-template-rows: auto auto;
  align-items: center;
  column-gap: 12px;
  padding: 14px 16px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--ink-800);
  border-radius: var(--r);
  text-decoration: none;
  color: inherit;
  transition: border-color 180ms var(--ease), transform 180ms var(--ease),
    background-color 180ms var(--ease);
}

.page-faq .faq-index__item:hover {
  border-left-color: var(--signal);
  background: var(--signal-soft);
  transform: translateX(2px);
}

.page-faq .faq-index__item:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
  border-left-color: var(--signal);
}

.page-faq .faq-index__num {
  grid-row: 1 / 3;
  grid-column: 1;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--signal-text);
}

.page-faq .faq-index__name {
  grid-column: 2;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink-800);
}

.page-faq .faq-index__desc {
  grid-column: 2;
  margin-top: 3px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--graphite);
}

.page-faq .faq-index__count {
  grid-row: 1 / 3;
  grid-column: 3;
  align-self: center;
  font-size: 13px;
  color: var(--graphite);
}

/* --- 问答分组 --- */

.page-faq .faq-sec {
  padding-block: clamp(40px, 7vw, 72px);
}

.page-faq .faq-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0 16px;
  align-items: start;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 26px;
}

.page-faq .faq-head__num {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--signal-text);
  padding-top: 8px;
}

.page-faq .faq-head__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(22px, 5.2vw, 34px);
  line-height: 1.22;
  color: var(--ink-800);
  margin: 0;
}

.page-faq .faq-head__note {
  margin: 8px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-faq .section--ink .faq-head {
  border-bottom-color: var(--rule-ink);
}

.page-faq .section--ink .faq-head__num {
  color: var(--celadon);
}

.page-faq .section--ink .faq-head__title {
  color: var(--on-ink);
}

.page-faq .section--ink .faq-head__note {
  color: var(--on-ink-soft);
}

/* --- 配图 --- */

.page-faq .faq-figure {
  margin: 0 0 26px;
}

.page-faq .faq-figure .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--rule);
  border-radius: var(--r);
}

.page-faq .section--ink .faq-figure .media-frame__img {
  border-color: var(--rule-ink);
}

.page-faq .faq-figure .media-frame__cap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--graphite);
}

.page-faq .section--ink .faq-figure .media-frame__cap {
  color: var(--on-ink-soft);
}

/* --- 折叠问答 --- */

.page-faq .faq-list {
  display: grid;
  gap: 10px;
  margin: 0;
}

.page-faq .faq-acc {
  background: var(--card);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--rule);
  border-radius: var(--r);
  transition: border-left-color 200ms var(--ease),
    background-color 200ms var(--ease);
}

.page-faq .faq-acc[open] {
  border-left-color: var(--signal);
}

.page-faq .faq-acc .acc__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-acc .acc__q::marker {
  content: "";
}

.page-faq .faq-acc__num {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--graphite);
  transition: color 200ms var(--ease);
}

.page-faq .faq-acc[open] .faq-acc__num {
  color: var(--signal-text);
  font-weight: 700;
}

.page-faq .faq-acc .acc__t {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--ink-800);
}

.page-faq .faq-acc .acc__a {
  margin: 0;
  padding: 0 16px 18px;
}

.page-faq .faq-acc .acc__a::before {
  content: "";
  display: block;
  height: 1px;
  margin-bottom: 14px;
  background: var(--rule);
}

.page-faq .faq-acc .acc__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--graphite);
}

.page-faq .faq-acc .acc__a p + p {
  margin-top: 10px;
}

.page-faq .section--ink .faq-acc {
  background: var(--ink-700);
  border-color: var(--rule-ink);
  border-left-color: rgba(199, 207, 216, 0.32);
}

.page-faq .section--ink .faq-acc[open] {
  border-left-color: var(--signal);
}

.page-faq .section--ink .faq-acc .acc__t {
  color: var(--on-ink);
}

.page-faq .section--ink .faq-acc__num {
  color: var(--on-ink-soft);
}

.page-faq .section--ink .faq-acc[open] .faq-acc__num {
  color: var(--signal);
}

.page-faq .section--ink .faq-acc .acc__a::before {
  background: var(--rule-ink);
}

.page-faq .section--ink .faq-acc .acc__a p {
  color: var(--on-ink-soft);
}

/* --- 术语与联系出口 --- */

.page-faq .faq-terms__list {
  margin: 0;
  border-top: 1px solid var(--rule-ink);
}

.page-faq .faq-term {
  display: grid;
  grid-template-columns: 1fr;
  gap: 5px;
  padding: 15px 0;
  border-bottom: 1px solid var(--rule-ink);
}

.page-faq .faq-term__k {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--celadon);
}

.page-faq .faq-term__v {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--on-ink-soft);
}

.page-faq .faq-exit {
  margin-top: 34px;
  padding: 22px 20px;
  background: var(--ink-700);
  border: 1px solid var(--rule-ink);
  border-left: 3px solid var(--signal);
  border-radius: var(--r);
}

.page-faq .faq-exit p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--on-ink-soft);
}

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

.page-faq .faq-exit__actions .btn {
  flex: 1 1 160px;
  text-align: center;
}

/* --- 响应式 --- */

@media (min-width: 640px) {
  .page-faq .faq-acc .acc__q {
    padding: 18px 20px;
  }

  .page-faq .faq-acc .acc__a {
    padding: 0 20px 20px;
  }

  .page-faq .faq-figure {
    margin-bottom: 30px;
  }

  .page-faq .faq-exit {
    padding: 26px 28px;
  }
}

@media (min-width: 860px) {
  .page-faq .faq-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .page-faq .faq-hero__title {
    max-width: 18ch;
  }

  .page-faq .faq-term {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: baseline;
    gap: 24px;
    padding: 16px 0;
  }

  .page-faq .faq-exit__actions .btn {
    flex: 0 0 auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__item,
  .page-faq .faq-acc,
  .page-faq .faq-acc__num,
  .page-faq .faq-crumb a {
    transition: none;
  }

  .page-faq .faq-index__item:hover {
    transform: none;
  }
}