.page-faq {
  --faq-accent: var(--sd-orange);
  --faq-alt: #0B2440;
  --faq-gridline: rgba(44, 74, 102, 0.22);
  --faq-pad: clamp(20px, 3.5vw, 34px);
  background-color: var(--sd-deep);
  background-image:
    repeating-linear-gradient(to right, var(--faq-gridline) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(to bottom, var(--faq-gridline) 0 1px, transparent 1px 72px);
  color: var(--sd-white);
  font-family: var(--sd-font-body);
  overflow-x: hidden;
}

.page-faq a {
  color: inherit;
  text-decoration: none;
}

.page-faq .faq-inline {
  color: var(--sd-cyan);
  border-bottom: 1px solid rgba(33, 212, 224, 0.45);
  transition: color 0.2s var(--sd-ease), border-color 0.2s var(--sd-ease);
}

.page-faq .faq-inline:hover,
.page-faq .faq-inline:focus-visible {
  color: var(--faq-accent);
  border-bottom-color: var(--faq-accent);
}

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

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-block: clamp(28px, 5vw, 56px) clamp(40px, 6vw, 76px);
  border-bottom: 1px solid var(--sd-hair);
}

.page-faq .sd-crumbs {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-faq .faq-hero__copy {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-faq .faq-hero__title {
  margin: 0;
  color: var(--sd-white);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.02;
}

.page-faq .faq-hero__lede {
  max-width: 58ch;
  margin: 0;
  color: var(--sd-mist);
  font-size: 16px;
  line-height: 1.78;
}

.page-faq .faq-hero__figure,
.page-faq .faq-figure {
  margin: 0;
  border: 1px solid var(--sd-hair);
  background: var(--faq-alt);
  position: relative;
  overflow: hidden;
}

.page-faq .faq-hero__figure::after,
.page-faq .faq-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(to right, rgba(33, 212, 224, 0.13) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(to bottom, rgba(33, 212, 224, 0.13) 0 1px, transparent 1px 40px);
}

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

.page-faq .faq-hero__figure figcaption,
.page-faq .faq-figure figcaption {
  padding: 10px 14px 12px;
  border-top: 1px solid var(--sd-hair);
  color: var(--sd-mist);
  font-size: 12px;
  letter-spacing: 0.06em;
}

/* ---------- 主题目录 ---------- */
.page-faq .faq-map {
  padding-block: clamp(38px, 6vw, 68px);
}

.page-faq .faq-map__head {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-faq .faq-map__head .sd-h2 {
  margin: 0;
  color: var(--sd-white);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.15;
}

.page-faq .faq-map__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--sd-hair);
  border: 1px solid var(--sd-hair);
}

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

.page-faq .faq-map__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "no title"
    "no meta";
  column-gap: 16px;
  row-gap: 4px;
  align-content: center;
  min-height: 92px;
  padding: 18px 20px;
  background: var(--faq-alt);
  transition: background 0.24s var(--sd-ease), box-shadow 0.24s var(--sd-ease);
}

.page-faq .faq-map__link:hover,
.page-faq .faq-map__link:focus-visible {
  background: rgba(255, 107, 26, 0.1);
  box-shadow: inset 3px 0 0 var(--faq-accent);
}

.page-faq .faq-map__no {
  grid-area: no;
  align-self: center;
  color: var(--faq-accent);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
}

.page-faq .faq-map__title {
  grid-area: title;
  color: var(--sd-white);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
}

.page-faq .faq-map__meta {
  grid-area: meta;
  color: var(--sd-mist);
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.5;
}

/* ---------- 问答主体 ---------- */
.page-faq .faq-body {
  padding-block: clamp(38px, 6vw, 72px) clamp(56px, 8vw, 104px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
}

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

.page-faq .faq-group {
  margin-bottom: clamp(40px, 6vw, 72px);
  border-top: 1px solid var(--sd-hair);
  padding-top: clamp(20px, 3vw, 30px);
}

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

.page-faq .faq-group__head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-faq .faq-group__head .sd-h2 {
  margin: 0;
  color: var(--sd-white);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.18;
  letter-spacing: -0.01em;
}

.page-faq .faq-group__intro {
  max-width: 62ch;
  margin: 0;
  color: var(--sd-mist);
  font-size: 15px;
  line-height: 1.75;
}

.page-faq .faq-figure {
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-faq .faq-list {
  display: flex;
  flex-direction: column;
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  border-top: 1px solid var(--sd-hair);
}

.page-faq .faq-item:last-child {
  border-bottom: 1px solid var(--sd-hair);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 42px 18px 0;
  position: relative;
  cursor: pointer;
  list-style: none;
  color: var(--sd-white);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  transition: color 0.2s var(--sd-ease);
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__q:hover {
  color: var(--sd-cyan);
}

.page-faq .faq-item__q::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 17px;
  color: var(--sd-cyan);
  font-family: var(--sd-font-data);
  font-size: 20px;
  line-height: 1;
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "–";
  color: var(--faq-accent);
}

.page-faq .faq-item__no {
  flex: none;
  color: var(--faq-accent);
  font-size: 13px;
  letter-spacing: 0.06em;
  padding-top: 3px;
}

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

.page-faq .faq-item__a {
  padding: 0 40px 22px 0;
  color: var(--sd-mist);
  animation: faq-fade 0.3s var(--sd-ease) both;
}

.page-faq .faq-item__a p {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.78;
}

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

.page-faq .faq-item__key {
  border-left: 3px solid var(--faq-accent);
  padding: 4px 0 4px 14px;
  color: var(--sd-white);
  font-weight: 500;
}

.page-faq .faq-cta {
  margin-top: 6px;
}

@keyframes faq-fade {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 右侧分区索引 ---------- */
.page-faq .faq-rail {
  min-width: 0;
}

.page-faq .faq-rail__title {
  margin: 0 0 10px;
  color: var(--sd-mist);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--sd-hair);
  color: var(--sd-mist);
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  transition: color 0.2s var(--sd-ease), border-color 0.2s var(--sd-ease), background 0.2s var(--sd-ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--sd-white);
  border-color: var(--sd-cyan);
}

.page-faq .faq-rail__link[aria-current]:not([aria-current="false"]) {
  color: var(--sd-white);
  border-color: var(--faq-accent);
  background: rgba(255, 107, 26, 0.12);
}

.page-faq .faq-rail__no {
  color: var(--faq-accent);
  font-size: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-map__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-item__q {
    font-size: 18px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }

  .page-faq .faq-hero__figure {
    align-self: stretch;
  }

  .page-faq .faq-hero__figure img {
    height: 100%;
    min-height: 260px;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 1fr) 232px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 104px;
    padding-left: 20px;
    border-left: 1px solid var(--sd-hair);
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-faq .faq-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    padding: 9px 10px;
    white-space: normal;
  }

  .page-faq .faq-rail__link[aria-current]:not([aria-current="false"]) {
    border-left-color: var(--faq-accent);
    background: rgba(255, 107, 26, 0.08);
  }
}

.page-faq [data-index-target] {
  scroll-margin-top: 108px;
}

.page-faq [data-reveal].is-visible {
  animation: faq-reveal 460ms var(--sd-ease) both;
}

@keyframes faq-reveal {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__a,
  .page-faq [data-reveal].is-visible {
    animation: none;
  }

  .page-faq .faq-map__link,
  .page-faq .faq-item__q,
  .page-faq .faq-rail__link {
    transition: none;
  }
}