.page-faq {
  padding-bottom: 64px;
  color: var(--frost);
}

.page-faq [hidden] {
  display: none !important;
}

.page-faq .crumbs {
  margin-top: 20px;
}

.page-faq .h1 {
  margin: 10px 0 0;
  font-size: clamp(1.9rem, 5.4vw, 3.4rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  font-weight: 800;
}

.page-faq .h2 {
  margin: 0;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-faq .lead {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--lime-dim);
}

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

/* ---------- 首屏检索区 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: 28px;
  padding: 26px 0 0;
  border-top: 1px solid var(--line);
  margin-top: 18px;
}

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

.page-faq .faq-search {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 26px;
  border: 1px solid var(--line);
  background: var(--stand);
  padding-left: 16px;
}

.page-faq .faq-search::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--line);
  transition: background 200ms var(--ease);
}

.page-faq .faq-search:focus-within::before {
  background: var(--lime);
}

.page-faq .faq-search__label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.page-faq .faq-search__input {
  flex: 1 1 auto;
  min-width: 0;
  background: transparent;
  border: 0;
  color: var(--frost);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  padding: 16px 4px 16px 10px;
}

.page-faq .faq-search__input::placeholder {
  color: var(--mist);
  opacity: 0.75;
}

.page-faq .faq-search__input:focus {
  outline: none;
}

.page-faq .faq-search__hint {
  flex: 0 0 auto;
  padding-right: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.page-faq .faq-chip {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: 0.02em;
  padding: 9px 13px;
  cursor: pointer;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-faq .faq-chip:hover {
  color: var(--frost);
  border-color: var(--mist);
}

.page-faq .faq-chip[aria-pressed="true"] {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
  font-weight: 700;
}

.page-faq .faq-hero__fig {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--stand);
}

.page-faq .faq-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.55) brightness(0.78);
}

.page-faq .faq-hero__fig figcaption {
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 章节头 ---------- */
.page-faq .faq-block {
  margin-top: 58px;
}

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

.page-faq .faq-head__coord {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lime);
  padding-top: 8px;
  white-space: nowrap;
}

.page-faq .faq-head__sub {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 60ch;
}

/* ---------- 三组索引 ---------- */
.page-faq .docs-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-top: 0;
}

.page-faq .doc-card {
  background: var(--stand);
  padding: 18px 16px 22px;
  min-width: 0;
}

.page-faq .doc-card__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.page-faq .doc-card__code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--lime);
}

.page-faq .doc-card__count {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .doc-card__title {
  margin: 14px 0 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-faq .doc-card__desc {
  margin: 8px 0 14px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

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

.page-faq .doc-list li {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 10px;
  padding: 8px 0;
  border-top: 1px solid var(--board);
}

.page-faq .doc-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .doc-no {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--mist);
  padding-top: 3px;
}

.page-faq .doc-title {
  font-size: 14px;
  line-height: 1.6;
  color: var(--frost);
}

.page-faq .faq-empty {
  margin: 0;
  background: var(--stand);
  padding: 22px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 高频问答 ---------- */
.page-faq .qa-list {
  border-bottom: 1px solid var(--line);
}

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

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

.page-faq .qa summary {
  display: grid;
  grid-template-columns: 34px 1fr auto;
  gap: 12px;
  align-items: baseline;
  padding: 15px 2px;
  cursor: pointer;
  list-style: none;
  transition: background 180ms var(--ease);
}

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

.page-faq .qa summary:hover {
  background: var(--stand);
}

.page-faq .qa summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--lime);
}

.page-faq .qa[open] summary::after {
  content: "−";
}

.page-faq .qa[open] summary {
  background: var(--stand);
}

.page-faq .qa__no {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .qa__q {
  font-size: 15px;
  line-height: 1.55;
  font-weight: 600;
  color: var(--frost);
}

.page-faq .qa__body {
  padding: 2px 2px 20px 46px;
  animation: faq-open 240ms var(--ease);
}

.page-faq .qa__body p {
  margin: 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.95;
  color: var(--mist);
}

@keyframes faq-open {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 联系 ---------- */
.page-faq .faq-contact {
  display: grid;
  gap: 24px;
  padding-top: 34px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-contact__fig {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--stand);
}

.page-faq .faq-contact__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.5) brightness(0.72);
}

.page-faq .faq-contact__fig figcaption {
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

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

.page-faq .faq-contact__rule {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 18px 0 0;
}

.page-faq .faq-contact__cols {
  display: grid;
  gap: 22px;
  margin-top: 22px;
}

.page-faq .faq-contact__cols p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-contact__label {
  font-family: var(--font-mono);
  font-size: 11px !important;
  letter-spacing: 0.16em;
  color: var(--lime) !important;
  padding-bottom: 6px;
}

.page-faq .faq-contact__foot {
  margin: 24px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 中等屏 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.55fr);
    align-items: start;
    gap: 32px;
  }

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

  .page-faq .faq-contact__cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }

  .page-faq .faq-contact {
    grid-template-columns: minmax(0, 0.42fr) minmax(0, 0.58fr);
    align-items: start;
    gap: 34px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-faq {
    padding-bottom: 96px;
  }

  .page-faq .faq-hero {
    padding-top: 34px;
  }

  .page-faq .faq-block {
    margin-top: 92px;
  }

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

  .page-faq .doc-card {
    padding: 22px 20px 26px;
  }

  .page-faq .qa summary {
    padding: 17px 4px;
  }

  .page-faq .faq-head {
    grid-template-columns: 90px 1fr;
    gap: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__body {
    animation: none;
  }

  .page-faq .faq-chip,
  .page-faq .faq-search::before,
  .page-faq .qa summary {
    transition: none;
  }
}