.page-faq {
  --faq-grid-soft: rgba(57, 255, 20, 0.12);
  --faq-grid-line: rgba(57, 255, 20, 0.32);
  --faq-orange-soft: rgba(255, 107, 53, 0.18);
  --faq-card-bg: rgba(255, 255, 255, 0.035);
  --faq-card-border: rgba(245, 247, 250, 0.16);
  --faq-answer-bg: rgba(10, 31, 60, 0.86);
  --faq-mono: "Roboto Mono", "SFMono-Regular", monospace;
  box-sizing: border-box;
  background:
    radial-gradient(circle at 14% 8%, rgba(57, 255, 20, 0.06), transparent 20rem),
    radial-gradient(circle at 86% 4%, rgba(255, 107, 53, 0.07), transparent 22rem),
    linear-gradient(180deg, var(--c-deep) 0%, #0d2142 58%, var(--c-deep) 100%);
  color: var(--c-white);
}

.page-faq *,
.page-faq *::before,
.page-faq *::after {
  box-sizing: border-box;
}

.page-faq .container {
  max-width: calc(var(--container-width) + var(--container-pad) * 2);
}

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

.page-faq a {
  color: var(--c-neon);
  text-decoration-color: rgba(57, 255, 20, 0.4);
  text-underline-offset: 0.18em;
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

.page-faq a:hover,
.page-faq a:focus-visible {
  color: var(--c-white);
  text-decoration-color: var(--c-white);
}

.page-faq a:focus-visible,
.page-faq .btn:focus-visible,
.page-faq .page-faq__item-head:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 3px;
}

/* 面包屑 */
.page-faq__crumb {
  padding-top: 1.25rem;
  padding-bottom: 0.25rem;
}

.page-faq__crumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-iron-light);
}

.page-faq__crumb-list a {
  color: var(--c-iron-light);
  text-decoration: none;
}

.page-faq__crumb-list a:hover {
  color: var(--c-neon);
}

/* Hero 区 */
.page-faq__hero {
  position: relative;
  padding-top: clamp(2.5rem, 6vw, 5rem);
  padding-bottom: clamp(2rem, 4vw, 3.5rem);
  border-top: 4px solid var(--c-neon);
}

.page-faq__hero::before {
  content: "";
  position: absolute;
  inset: 4px 0 auto 0;
  height: 10px;
  background: repeating-linear-gradient(
      90deg,
      rgba(255, 255, 255, 0.14) 0 60px,
      transparent 60px 90px
    );
  pointer-events: none;
}

.page-faq__hero-grid {
  display: grid;
  gap: 1.75rem;
  margin-bottom: 2rem;
}

.page-faq__hero-copy .lead {
  max-width: 42rem;
  margin-top: 1rem;
  color: var(--c-iron-light);
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.8;
}

.page-faq__hero-status {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
  font-size: 0.8125rem;
  color: var(--c-iron-light);
}

.page-faq__hero-ver {
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--faq-grid-line);
  color: var(--c-neon);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
}

.page-faq__hero-dot {
  width: 8px;
  height: 8px;
  background: var(--c-neon);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.8);
}

.page-faq__hero-coord {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: 1px solid var(--faq-card-border);
  background: var(--faq-card-border);
}

.page-faq__coord-item {
  padding: 1rem;
  background: rgba(10, 31, 60, 0.82);
}

.page-faq__coord-item dt {
  margin-bottom: 0.4rem;
  color: var(--c-iron);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
}

.page-faq__coord-item dd {
  margin: 0;
  color: var(--c-white);
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 600;
}

.page-faq__hero-figure {
  position: relative;
  margin: 0;
  border: 1px solid rgba(245, 247, 250, 0.28);
  background: var(--c-deep);
}

.page-faq__hero-figure::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(90deg, transparent 31.5%, rgba(57, 255, 20, 0.2) 31.5%, rgba(57, 255, 20, 0.2) 31.7%, transparent 31.7%),
    linear-gradient(0deg, transparent 63%, rgba(57, 255, 20, 0.14) 63%, rgba(57, 255, 20, 0.14) 63.2%, transparent 63.2%);
  pointer-events: none;
}

.page-faq__hero-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-faq__hero-caption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.75rem 1rem;
  border-top: 1px solid rgba(245, 247, 250, 0.16);
  color: var(--c-iron-light);
  font-size: 0.8125rem;
}

.page-faq__hero-caption .mono {
  color: var(--c-neon);
}

/* 布局：索引 + 解答 */
.page-faq__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.5rem;
  padding-top: clamp(2.5rem, 6vw, 4.5rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

.page-faq__index-inner {
  padding-left: 1.25rem;
  border-left: 2px solid var(--c-neon);
}

.page-faq__index-title {
  margin: 0.5rem 0 0;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3vw, 2.125rem);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-faq__index-list {
  display: grid;
  gap: 0.35rem;
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
}

.page-faq__index-list a {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.7rem 0.75rem;
  border: 1px solid transparent;
  color: var(--c-iron-light);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.page-faq__index-list a::after {
  content: "→";
  margin-left: auto;
  color: var(--c-neon);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.page-faq__index-list a:hover,
.page-faq__index-list a:focus-visible {
  background: rgba(57, 255, 20, 0.06);
  border-color: var(--faq-grid-soft);
  color: var(--c-white);
}

.page-faq__index-list a:hover::after,
.page-faq__index-list a:focus-visible::after {
  opacity: 1;
  transform: translateX(0);
}

.page-faq__idx-num {
  color: var(--c-neon);
  font-size: 0.6875rem;
}

.page-faq__index-tip {
  margin: 0 0 1.25rem;
  color: var(--c-iron);
  font-size: 0.8125rem;
  line-height: 1.7;
}

.page-faq__index-inner .btn {
  width: 100%;
}

/* 手风琴组 */
.page-faq__groups {
  display: grid;
  gap: clamp(2.5rem, 5vw, 3.5rem);
  min-width: 0;
}

.page-faq__group {
  scroll-margin-top: 8rem;
}

.page-faq__group:target .index-head__bar {
  background: var(--c-neon);
}

.page-faq__group:target {
  background: linear-gradient(90deg, rgba(57, 255, 20, 0.045), transparent 65%);
}

.page-faq__item {
  margin-top: 0.875rem;
  border: 1px solid var(--faq-card-border);
  background: var(--faq-card-bg);
  scroll-margin-top: 8rem;
}

.page-faq__item-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.125rem 1.25rem;
  cursor: pointer;
  color: var(--c-white);
  font-weight: 600;
  font-size: 0.9375rem;
  line-height: 1.5;
  list-style: none;
  transition: background 0.2s ease;
}

.page-faq__item-head::-webkit-details-marker {
  display: none;
}

.page-faq__item-head::-moz-list-bullet {
  display: none;
}

.page-faq__item-head::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 400;
  line-height: 1;
  color: var(--c-neon);
  transition: transform 0.2s ease, color 0.2s ease;
}

.page-faq__item[open] > .page-faq__item-head {
  background: rgba(57, 255, 20, 0.05);
}

.page-faq__item[open] > .page-faq__item-head::after {
  content: "−";
}

.page-faq__item-q {
  flex: 1 1 auto;
}

.page-faq__chip {
  flex: 0 0 auto;
  padding: 0.25rem 0.5rem;
  border: 1px solid rgba(245, 247, 250, 0.22);
  color: var(--c-iron-light);
  font-family: var(--font-mono);
  font-size: 0.6563rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.page-faq__chip--neon {
  border-color: rgba(57, 255, 20, 0.5);
  color: var(--c-neon);
}

.page-faq__chip--orange {
  border-color: rgba(255, 107, 53, 0.55);
  color: var(--c-orange);
}

/* 手风琴内容展开动画 */
.page-faq__item-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.28s ease;
}

.page-faq__item[open] .page-faq__item-body {
  grid-template-rows: 1fr;
}

.page-faq__item-collapse {
  overflow: hidden;
  min-height: 0;
}

.page-faq__item-inner {
  padding: 0 1.25rem 1.25rem 1.5rem;
  color: var(--c-iron-light);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.page-faq__item-inner p {
  margin: 0 0 0.9rem;
}

.page-faq__item-inner p:last-child {
  margin-bottom: 0;
}

.page-faq__item-inner a {
  font-weight: 500;
}

/* 内嵌说明图 */
.page-faq__inline-figure {
  margin: 1.25rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px dashed rgba(57, 255, 20, 0.25);
}

.page-faq__inline-figure img {
  display: block;
  width: 100%;
  max-width: 28rem;
  border: 1px solid var(--faq-card-border);
  background: #fff;
}

.page-faq__inline-figure figcaption {
  margin-top: 0.6rem;
  color: var(--c-iron);
  font-size: 0.75rem;
  line-height: 1.6;
}

/* 数据面板示意图 */
.page-faq__mock-panel {
  margin-top: 1.5rem;
  padding: 0.75rem;
  border: 1px solid rgba(57, 255, 20, 0.32);
  background: rgba(10, 31, 60, 0.9);
}

.page-faq__mock-panel svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-faq__legend {
  margin-top: 0.6rem;
}

.page-faq__swatch-data {
  background: var(--c-data);
}

/* CTA 区 */
.page-faq__cta {
  position: relative;
  border-top: 1px solid rgba(10, 31, 60, 0.08);
}

.page-faq__cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--c-neon) 0%, var(--c-orange) 60%, transparent 60%);
}

.page-faq__cta-inner {
  display: grid;
  gap: 1.75rem;
  align-items: end;
}

.page-faq__cta-copy .lead {
  color: var(--c-iron);
}

.page-faq__cta-copy h2 {
  margin: 0.4rem 0 0.75rem;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.5vw, 2.375rem);
  line-height: 1.2;
  color: var(--c-deep);
}

.page-faq__cta-copy p:last-of-type {
  max-width: 38rem;
  margin-bottom: 0;
  color: var(--c-iron);
}

.page-faq__cta-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* 桌面端布局 */
@media (min-width: 60rem) {
  .page-faq__hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: 2.5rem;
  }

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

  .page-faq__layout {
    grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
    gap: clamp(3rem, 6vw, 5rem);
    align-items: start;
  }

  .page-faq__index-inner {
    position: sticky;
    top: 7rem;
  }

  .page-faq__cta-inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
    gap: 3rem;
  }

  .page-faq__cta-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 42rem) {
  .page-faq__hero-coord {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}