/* ===== 知识中心 · 页面专属样式 ===== */
.page-faq {
  --faq-sec: clamp(44px, 7vw, 84px);
  --faq-gap: clamp(20px, 3.4vw, 40px);
  position: relative;
  overflow-x: clip;
}

.page-faq img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-top: calc(var(--header-h) + clamp(18px, 4vw, 46px));
  padding-bottom: clamp(30px, 5vw, 58px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -1px;
  z-index: -2;
  background:
    linear-gradient(115deg, var(--ink-2) 0 41%, transparent 41.2%),
    linear-gradient(115deg, transparent 0 63%, rgba(200, 162, 60, 0.09) 63.2% 100%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.55;
  -webkit-mask-image: radial-gradient(125% 95% at 18% 0%, #000 22%, transparent 76%);
  mask-image: radial-gradient(125% 95% at 18% 0%, #000 22%, transparent 76%);
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: var(--faq-gap);
  margin-top: clamp(20px, 4vw, 38px);
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(29px, 5.4vw, 46px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--white);
  text-wrap: balance;
}

.page-faq .faq-hero__intro {
  margin: 18px 0 0;
  max-width: 44ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--white);
  opacity: 0.84;
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  align-self: end;
}

.page-faq .faq-hero__stat {
  background: var(--ink);
  padding: 15px 16px;
}

.page-faq .faq-hero__stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 3vw, 27px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--gold-l);
}

.page-faq .faq-hero__stat b small {
  margin-left: 2px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
}

.page-faq .faq-hero__stat span {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 通栏主图 ---------- */
.page-faq .faq-banner {
  margin: 0;
  position: relative;
  border-bottom: 1px solid var(--line);
  background: var(--ink-2);
}

.page-faq .faq-banner img {
  display: block;
  width: 100%;
  aspect-ratio: 1400 / 600;
  object-fit: cover;
  opacity: 0.88;
}

/* ---------- 区块骨架 ---------- */
.page-faq .faq-block {
  padding-block: var(--faq-sec);
}

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

.page-faq .section-head {
  display: grid;
  gap: 10px;
  margin: 0 0 clamp(22px, 3vw, 34px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .section-head__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-m);
}

.page-faq .section-head__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(21px, 3vw, 29px);
  line-height: 1.34;
  letter-spacing: -0.005em;
  color: var(--white);
  text-wrap: balance;
}

@media (min-width: 780px) {
  .page-faq .section-head {
    grid-template-columns: minmax(150px, 190px) minmax(0, 1fr);
    align-items: baseline;
    gap: 24px;
  }
}

/* ---------- 分类标签带 ---------- */
.page-faq .faq-tabs {
  margin-top: 4px;
}

.page-faq .faq-tabs .tablist {
  display: flex;
  gap: 1px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: thin;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-tabs .tab {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: 13px 15px;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-faq .faq-tabs .tab .tab-i {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gold-d);
  transition: color 0.18s ease;
}

.page-faq .faq-tabs .tab:hover {
  color: var(--white);
}

.page-faq .faq-tabs .tab[aria-selected="true"] {
  color: var(--gold-l);
  border-bottom-color: var(--gold);
}

.page-faq .faq-tabs .tab[aria-selected="true"] .tab-i {
  color: var(--gold);
}

.page-faq .faq-tabs .tab:focus-visible {
  outline: 1px solid var(--gold);
  outline-offset: -3px;
}

.page-faq .faq-tabs .tabpanel {
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-tabs .tabpanel[hidden] {
  display: none;
}

/* ---------- 问答条目 ---------- */
.page-faq .qa {
  border-bottom: 1px solid var(--line-soft);
  border-left: 3px solid transparent;
  transition: border-left-color 0.18s ease, background-color 0.18s ease;
}

.page-faq .qa:last-child {
  border-bottom: 0;
}

.page-faq .qa[open] {
  border-left-color: var(--jade);
  background: linear-gradient(90deg, rgba(62, 156, 138, 0.09) 0%, rgba(62, 156, 138, 0) 52%);
}

.page-faq .qa > summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 10px 16px 13px;
  list-style: none;
  cursor: pointer;
  color: var(--white);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.62;
  transition: color 0.18s ease, padding-left 0.2s ease;
}

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

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

.page-faq .qa > summary:hover {
  color: var(--gold-l);
  padding-left: 18px;
}

.page-faq .qa > summary:focus-visible {
  outline: 1px solid var(--gold);
  outline-offset: -2px;
}

.page-faq .qa__no {
  flex: 0 0 auto;
  min-width: 46px;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--gold-m);
  transition: color 0.18s ease;
}

.page-faq .qa[open] .qa__no {
  color: var(--gold-l);
}

.page-faq .qa__t {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .qa__mark {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-left: auto;
  margin-top: 10px;
  border-right: 1px solid var(--gold);
  border-bottom: 1px solid var(--gold);
  transform: rotate(45deg);
  transition: transform 0.2s ease, margin-top 0.2s ease;
}

.page-faq .qa[open] .qa__mark {
  transform: rotate(-135deg);
  margin-top: 13px;
}

.page-faq .qa__a {
  padding: 0 18px 18px 18px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--muted);
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 62ch;
}

.page-faq .qa__a a {
  color: var(--white);
  text-decoration: underline;
  text-decoration-color: var(--gold);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-faq .qa__a a:hover {
  color: var(--gold-l);
}

@media (min-width: 720px) {
  .page-faq .qa > summary {
    padding: 18px 12px 18px 14px;
  }
  .page-faq .qa__a {
    padding: 0 64px 20px 73px;
  }
}

/* ---------- 术语速查 ---------- */
.page-faq .faq-glossary__layout {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
}

.page-faq .faq-table {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-faq .faq-table caption {
  padding-bottom: 12px;
  text-align: left;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-faq .faq-table th,
.page-faq .faq-table td {
  padding: 13px 14px;
  text-align: left;
  vertical-align: top;
  line-height: 1.62;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--gold-m);
  white-space: nowrap;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-table tbody th {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--gold-l);
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.page-faq .faq-table tbody td {
  color: var(--muted);
}

.page-faq .faq-table tbody tr:hover {
  background: var(--wash);
}

.page-faq .faq-table a {
  color: var(--white);
  text-decoration: underline;
  text-decoration-color: var(--gold);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-faq .faq-table a:hover {
  color: var(--gold-l);
}

.page-faq .faq-glossary__fig {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-faq .faq-glossary__fig img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  opacity: 0.9;
}

@media (min-width: 1000px) {
  .page-faq .faq-glossary__layout {
    grid-template-columns: minmax(0, 1.8fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 收尾指引 ---------- */
.page-faq .faq-next__grid {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-faq .faq-next__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--ink);
  color: inherit;
  text-decoration: none;
  transition: background-color 0.18s ease;
}

.page-faq .faq-next__item:hover {
  background: var(--ink-2);
}

.page-faq .faq-next__item:focus-visible {
  outline: 1px solid var(--gold);
  outline-offset: -3px;
}

.page-faq .faq-next__item .chev {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gold-m);
}

.page-faq .faq-next__item strong {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--white);
}

.page-faq .faq-next__item span {
  font-size: 13px;
  line-height: 1.74;
  color: var(--muted);
}

@media (min-width: 760px) {
  .page-faq .faq-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa > summary,
  .page-faq .qa__no,
  .page-faq .qa__mark,
  .page-faq .faq-tabs .tab,
  .page-faq .faq-tabs .tab .tab-i,
  .page-faq .faq-next__item {
    transition: none !important;
  }
}