.page-faq {
  --faq-line: rgba(27, 72, 119, .5);
  --faq-line-soft: rgba(27, 72, 119, .28);
  --faq-link: #B3540A;
  padding-bottom: clamp(48px, 9vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 6vw, 60px) 0 clamp(32px, 6vw, 56px);
  border-bottom: 1px solid var(--deep-line);
  background-color: var(--night);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(58% 76% at 82% 6%, rgba(47, 227, 200, .16), transparent 62%),
    radial-gradient(52% 70% at 6% -10%, rgba(255, 122, 24, .2), transparent 64%);
  pointer-events: none;
}

.page-faq .faq-hero-inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-faq .faq-title {
  margin: 12px 0 0;
  font-size: clamp(34px, 8.5vw, 54px);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--ice);
}

.page-faq .faq-lede {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: 17px;
  line-height: 1.78;
  color: var(--mist);
}

.page-faq .faq-quick {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  background: var(--faq-line);
  border: 1px solid var(--faq-line);
}

.page-faq .faq-quick li {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 6px;
  row-gap: 2px;
  padding: 14px 16px;
  background: rgba(6, 23, 38, .93);
}

.page-faq .quick-num {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  font-weight: 700;
  color: var(--orange);
}

.page-faq .quick-unit {
  align-self: end;
  padding-bottom: 4px;
  font-size: 13px;
  color: var(--cyan);
}

.page-faq .quick-lab {
  grid-column: 1 / -1;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
}

@media (min-width: 640px) {
  .page-faq .faq-quick {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-top: clamp(28px, 6vw, 56px);
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 0 56px;
  }
}

/* ---------- 左侧分类锚点 ---------- */
.page-faq .faq-rail {
  min-width: 0;
}

.page-faq .rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-faq .toc-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
}

.page-faq .toc-list > li {
  flex: 0 0 auto;
}

.page-faq .toc-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border-left: 2px solid var(--faq-line-soft);
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .toc-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--orange-soft);
}

.page-faq .toc-link:hover {
  color: var(--ice);
}

.page-faq .toc-link[aria-current="true"] {
  color: var(--ice);
  border-left-color: var(--orange);
  background: rgba(255, 122, 24, .1);
}

.page-faq .toc-link[aria-current="true"] .toc-idx {
  color: var(--orange);
}

.page-faq .rail-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .rail-note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (min-width: 960px) {
  .page-faq .faq-rail {
    position: sticky;
    top: 112px;
    align-self: start;
    padding-right: 20px;
    border-right: 1px solid var(--faq-line-soft);
  }

  .page-faq .toc-list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-faq .toc-list > li + li {
    margin-top: 2px;
  }

  .page-faq .toc-link {
    white-space: normal;
    line-height: 1.45;
  }
}

/* ---------- 问答流 ---------- */
.page-faq .faq-stream {
  display: grid;
  gap: clamp(40px, 7vw, 64px);
  min-width: 0;
}

.page-faq .faq-block {
  min-width: 0;
  scroll-margin-top: 120px;
}

.page-faq .block-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .block-head h2 {
  margin: 0;
  font-size: clamp(21px, 4.6vw, 27px);
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--ice);
}

.page-faq .block-head .idx {
  font-size: 13px;
}

.page-faq .block-lede {
  margin: 14px 0 0;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 20px 0 0;
  border: 1px solid var(--faq-line);
  background: var(--blueprint);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa-list {
  margin-top: 22px;
  border-top: 1px solid var(--faq-line);
}

.page-faq .qa {
  border-bottom: 1px solid var(--faq-line);
  background: linear-gradient(180deg, rgba(14, 42, 71, .88), rgba(14, 42, 71, .5));
}

.page-faq .qa > summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 16px 16px 14px;
  cursor: pointer;
  list-style: none;
  color: var(--ice);
  transition: background-color .2s var(--ease);
}

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

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

.page-faq .qa > summary:hover {
  background: rgba(255, 122, 24, .07);
}

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

.page-faq .qa-idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: .04em;
  color: var(--orange);
}

.page-faq .qa-q {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.6;
}

.page-faq .qa > summary::after {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 9px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform .24s var(--ease);
}

.page-faq .qa[open] > summary::after {
  transform: rotate(225deg);
}

.page-faq .qa-a {
  padding: 16px 18px 18px;
  border-top: 1px solid rgba(6, 18, 38, .14);
  background: var(--paper);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.78;
}

.page-faq .qa-a p {
  margin: 0 0 .85em;
}

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

.page-faq .qa-a strong {
  color: #0E2A47;
  font-weight: 700;
}

.page-faq .qa-a a {
  color: var(--faq-link);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 收尾引导 ---------- */
.page-faq .faq-cta {
  margin-top: clamp(8px, 3vw, 24px);
  padding: clamp(24px, 5vw, 40px);
  border-left: 3px solid var(--orange);
}

.page-faq .faq-cta h2 {
  margin: 0;
  font-size: clamp(20px, 4vw, 26px);
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-faq .faq-cta p {
  margin: 12px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.78;
  color: #2C4258;
}

.page-faq .cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  margin-top: 22px;
}

.page-faq .faq-cta-link {
  font-size: 15px;
  font-weight: 600;
  color: var(--faq-link);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-faq .faq-cta-link:hover {
  color: #8A3F06;
}

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