.page-faq {
  --faq-panel: var(--ink-800);
  --faq-panel-deep: var(--ink-700);
  --faq-text: rgba(238, 244, 250, .82);
  --faq-text-dim: rgba(238, 244, 250, .64);
  background: var(--ink-900);
  color: var(--star);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .3;
  z-index: -2;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(14, 21, 34, .68) 0%, rgba(14, 21, 34, .9) 58%, var(--ink-900) 100%),
    radial-gradient(120% 80% at 12% 10%, rgba(28, 143, 196, .22), transparent 62%),
    radial-gradient(90% 70% at 88% 0%, rgba(232, 163, 61, .18), transparent 60%);
}

.page-faq .faq-hero__inner {
  padding-block: clamp(28px, 5vw, 56px) clamp(34px, 6vw, 64px);
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.75rem, 5.4vw, 3.5rem);
  line-height: 1.18;
  letter-spacing: -.02em;
  max-width: 22ch;
}

.page-faq .faq-hero__lede {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: clamp(.95rem, 1.6vw, 1.05rem);
  line-height: 1.8;
  color: var(--faq-text);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 44px);
  padding-block: clamp(26px, 4vw, 46px) clamp(48px, 8vw, 92px);
}

/* ---------- 左侧分类索引 ---------- */
.page-faq .faq-side {
  min-width: 0;
}

.page-faq .faq-side__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .2em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-faq .faq-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  padding-bottom: 6px;
}

.page-faq .faq-index > li {
  flex: 0 0 auto;
  min-width: 0;
}

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: auto auto;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid transparent;
  border-radius: 9px;
  background: rgba(24, 34, 52, .55);
  color: var(--star);
  text-decoration: none;
  font-size: .9rem;
  line-height: 1.4;
  white-space: nowrap;
  transition: border-color .2s ease, background .2s ease, color .2s ease;
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: .74rem;
  color: var(--faq-text-dim);
  letter-spacing: .06em;
}

.page-faq .faq-index__count {
  display: none;
  font-family: var(--font-mono);
  font-size: .74rem;
  color: var(--faq-text-dim);
  padding-left: 2px;
}

.page-faq .faq-index__link:hover {
  border-color: var(--line-gold);
  background: rgba(232, 163, 61, .1);
  color: var(--gold-soft);
}

.page-faq .faq-index__link[aria-current],
.page-faq .faq-index__link[aria-current="true"] {
  border-left-color: var(--gold);
  background: rgba(232, 163, 61, .14);
  color: var(--gold-soft);
}

.page-faq .faq-index__link[aria-current] .faq-index__num,
.page-faq .faq-index__link[aria-current="true"] .faq-index__num {
  color: var(--gold);
}

.page-faq .faq-side__foot {
  margin: 14px 0 0;
  font-size: .86rem;
  line-height: 1.7;
  color: var(--faq-text-dim);
}

.page-faq .faq-side__foot a {
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid rgba(28, 143, 196, .45);
}

.page-faq .faq-side__foot a:hover {
  color: var(--gold-soft);
  border-bottom-color: var(--line-gold);
}

/* ---------- 分类区块 ---------- */
.page-faq .faq-main {
  min-width: 0;
}

.page-faq .faq-cat {
  position: relative;
  margin: 0 0 clamp(20px, 3vw, 32px);
  padding: clamp(18px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(158deg, rgba(24, 34, 52, .92) 0%, rgba(14, 21, 34, .82) 62%, rgba(11, 17, 27, .92) 100%);
  box-shadow: var(--shadow-card);
  scroll-margin-top: 20px;
}

.page-faq .faq-cat::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  border-radius: var(--radius) 0 0 var(--radius);
  background: linear-gradient(180deg, var(--gold), rgba(232, 163, 61, 0));
}

.page-faq .faq-cat__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 14px;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 1px dashed var(--line);
}

.page-faq .faq-cat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -.02em;
}

.page-faq .faq-cat__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.15rem, 3vw, 1.5rem);
  letter-spacing: -.01em;
  color: var(--star);
}

.page-faq .faq-cat__head .tag {
  margin-left: auto;
}

/* ---------- 示意图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 20px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  object-fit: cover;
  background: linear-gradient(150deg, var(--ink-800), var(--lake-deep));
}

.page-faq .faq-figure figcaption {
  margin-top: 9px;
  font-size: .82rem;
  line-height: 1.7;
  color: var(--faq-text-dim);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  margin: 0 0 10px;
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  background: rgba(11, 17, 27, .55);
  overflow: hidden;
  transition: border-color .2s ease, background .2s ease;
}

.page-faq .faq-item:last-child {
  margin-bottom: 0;
}

.page-faq .faq-item[open] {
  border-color: var(--line-gold);
  background: rgba(14, 21, 34, .8);
}

.page-faq .faq-item > summary {
  position: relative;
  display: block;
  padding: 14px 48px 14px 16px;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: clamp(.96rem, 2.4vw, 1.05rem);
  line-height: 1.6;
  color: var(--star);
}

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

.page-faq .faq-item > summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 16px;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.3rem;
  line-height: 1;
  color: var(--gold);
  transition: color .2s ease;
}

.page-faq .faq-item[open] > summary::after {
  content: "–";
}

.page-faq .faq-item > summary:hover {
  color: var(--gold-soft);
}

.page-faq .faq-item__body {
  padding: 13px 16px 17px;
  border-top: 1px solid var(--line-soft);
  font-size: .95rem;
  line-height: 1.8;
  color: var(--faq-text);
}

.page-faq .faq-item__body p {
  margin: 0 0 10px;
}

.page-faq .faq-item__body p:last-child {
  margin-bottom: 0;
}

.page-faq .faq-item__body a {
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid rgba(28, 143, 196, .45);
}

.page-faq .faq-item__body a:hover {
  color: var(--gold-soft);
  border-bottom-color: var(--line-gold);
}

.page-faq .faq-key {
  display: inline-block;
  padding: 6px 12px;
  border-left: 3px solid var(--gold);
  border-radius: 0 6px 6px 0;
  background: rgba(232, 163, 61, .1);
  font-family: var(--font-mono);
  font-size: .95rem;
  letter-spacing: .02em;
  color: var(--gold-soft);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-tail {
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(22px, 3.5vw, 36px);
  border: 1px solid var(--line-gold);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 130% at 0% 0%, rgba(232, 163, 61, .16), transparent 58%),
    linear-gradient(140deg, rgba(11, 79, 112, .5), rgba(14, 21, 34, .9));
}

.page-faq .faq-tail__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.2rem, 3.2vw, 1.7rem);
  letter-spacing: -.01em;
  color: var(--star);
}

.page-faq .faq-tail__text {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--faq-text);
}

.page-faq .faq-tail__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: 236px minmax(0, 1fr);
    align-items: start;
    gap: clamp(28px, 3.4vw, 52px);
  }

  .page-faq .faq-side {
    position: sticky;
    top: 26px;
    padding: 18px 16px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(18, 27, 43, .72);
  }

  .page-faq .faq-index {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 5px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index > li {
    flex: 1 1 auto;
  }

  .page-faq .faq-index__link {
    grid-template-columns: auto minmax(0, 1fr) auto;
    white-space: normal;
    border-left-width: 3px;
    border-radius: 8px;
    padding: 10px 12px;
  }

  .page-faq .faq-index__count {
    display: inline;
  }

  .page-faq .faq-body {
    padding-block: clamp(34px, 4vw, 58px) clamp(60px, 7vw, 96px);
  }
}

@media (min-width: 1440px) {
  .page-faq .faq-body {
    grid-template-columns: 268px minmax(0, 1fr);
  }
}

@media (max-width: 480px) {
  .page-faq .faq-cat__head .tag {
    margin-left: 0;
  }

  .page-faq .faq-key {
    font-size: .88rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__link,
  .page-faq .faq-item,
  .page-faq .faq-item > summary::after {
    transition: none;
  }
}