.page-faq {
  --faq-index-w: 248px;
  --faq-shell-gap: clamp(1.25rem, 4vw, 3.5rem);
  --faq-rule: rgba(13, 26, 43, 0.14);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(1.75rem, 5vw, 3.25rem) 0 clamp(1.5rem, 4vw, 2.75rem);
}

.page-faq .faq-hero__scale {
  margin-top: 1.1rem;
  height: 12px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--index) 0 1px,
    transparent 1px 36px
  );
  background-repeat: repeat-x;
  background-position: 0 100%;
  background-size: 36px 12px;
  opacity: 0.55;
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 4vw, 2.5rem);
  align-items: end;
  margin-top: clamp(1.25rem, 3vw, 2.25rem);
}

.page-faq .faq-hero__title {
  margin: 0.35rem 0 0;
}

.page-faq .faq-hero__lede {
  margin-top: 1rem;
  max-width: 34ch;
  color: var(--ink-2);
}

.page-faq .faq-hero__meta {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: 1.15rem;
  color: var(--ink-2);
}

.page-faq .faq-hero__media {
  margin: 0;
  position: relative;
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--ink);
  box-shadow: var(--shadow-lift);
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(13, 26, 43, 0) 42%, rgba(13, 26, 43, 0.55) 100%);
  pointer-events: none;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }
  .page-faq .faq-hero__text {
    grid-column: 1 / span 6;
  }
  .page-faq .faq-hero__media {
    grid-column: 8 / span 5;
  }
}

/* ---------- 双栏骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1rem, 3vw, 2rem);
  padding-block: clamp(1.25rem, 4vw, 2.5rem) clamp(3rem, 8vw, 6rem);
}

@media (min-width: 1024px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    column-gap: var(--faq-shell-gap);
    align-items: start;
  }
}

/* ---------- 左侧索引 ---------- */
.page-faq .faq-index__label {
  margin: 0 0 0.7rem;
  color: var(--index);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.6rem;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-index__item {
  flex: 0 0 auto;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--glass);
  color: var(--ink-2);
  font-size: 0.875rem;
  line-height: 1.3;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-index__no {
  font-size: 0.75rem;
  color: var(--index);
  letter-spacing: 0.08em;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-color: var(--green-2);
  color: var(--ink);
}

.page-faq .faq-index__link.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.page-faq .faq-index__link.is-active .faq-index__no {
  color: var(--cyan);
}

@media (min-width: 1024px) {
  .page-faq .faq-index__inner {
    position: sticky;
    top: calc(var(--header-h) + 1.75rem);
    padding-left: 1rem;
    border-left: 1px solid var(--line-strong);
  }
  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 0.15rem;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-faq .faq-index__item {
    flex: 1 1 auto;
  }
  .page-faq .faq-index__link {
    width: 100%;
    border: 0;
    border-radius: var(--radius-s);
    background: none;
    padding: 0.5rem 0.6rem;
    white-space: normal;
    font-size: 0.9rem;
  }
  .page-faq .faq-index__link.is-active {
    background: var(--paper-2);
    color: var(--ink);
    box-shadow: inset 3px 0 0 var(--orange);
  }
}

/* ---------- 章节 ---------- */
.page-faq .faq-chapter {
  padding-block: clamp(1.5rem, 4vw, 2.75rem);
  border-top: 1px solid var(--faq-rule);
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}

.page-faq .faq-stream .faq-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .faq-chapter__head {
  margin-bottom: clamp(1rem, 2.5vw, 1.75rem);
}

.page-faq .faq-chapter__title {
  margin: 0.3rem 0 0;
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  font-weight: 300;
  letter-spacing: 0.05em;
  line-height: 1.2;
}

.page-faq .faq-chapter__desc {
  margin: 0.7rem 0 0;
  max-width: 46ch;
  color: var(--ink-2);
  font-size: 0.95rem;
}

.page-faq .faq-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1rem, 3vw, 1.75rem);
  align-items: start;
}

@media (min-width: 860px) {
  .page-faq .faq-chapter__grid {
    grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
    column-gap: clamp(1.5rem, 3vw, 2.75rem);
  }
}

/* ---------- 问答条目 ---------- */
.page-faq .qa-list {
  border-top: 1px solid var(--line);
}

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

.page-faq .qa__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.95rem 0.15rem;
  cursor: pointer;
  list-style: none;
  transition: color 0.2s ease;
}

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

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

.page-faq .qa__summary:hover .qa__q {
  color: var(--green-2);
}

.page-faq .qa__summary:focus-visible {
  outline: 2px solid var(--green-2);
  outline-offset: 3px;
  border-radius: var(--radius-s);
}

.page-faq .qa__no {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--index);
  line-height: 1.9;
}

.page-faq .qa__q {
  font-size: clamp(1rem, 2.2vw, 1.12rem);
  font-weight: 500;
  line-height: 1.55;
  color: var(--ink);
  transition: color 0.2s ease;
}

.page-faq .qa__mark {
  position: relative;
  width: 20px;
  height: 20px;
  flex: none;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  color: var(--ink-2);
  align-self: center;
}

.page-faq .qa__mark::before {
  content: "";
  position: absolute;
  left: 4px;
  right: 4px;
  top: 50%;
  height: 1.5px;
  background: currentColor;
  transform: translateY(-50%);
}

.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 50%;
  width: 1.5px;
  background: currentColor;
  transform: translateX(-50%);
  transition: transform 0.22s ease, opacity 0.22s ease;
}

.page-faq .qa[open] .qa__mark {
  border-color: var(--green-2);
  color: var(--green-2);
}

.page-faq .qa[open] .qa__mark::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.page-faq .qa__body {
  padding: 0 0.15rem 1.35rem;
  max-width: 62ch;
}

@media (min-width: 720px) {
  .page-faq .qa__body {
    padding-left: 2.6rem;
  }
}

.page-faq .qa__body p {
  margin: 0 0 0.6rem;
  color: var(--ink-2);
  line-height: 1.85;
}

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

.page-faq .qa__body a {
  color: var(--green-2);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .qa__steps,
.page-faq .qa__bullets {
  margin: 0 0 0.6rem;
  padding-left: 1.15rem;
  color: var(--ink-2);
  line-height: 1.85;
}

.page-faq .qa__steps li,
.page-faq .qa__bullets li {
  margin-bottom: 0.25rem;
}

/* ---------- 数据脉冲板 ---------- */
.page-faq .faq-pulse {
  margin: 1.35rem 0;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  border-radius: var(--radius-m);
}

.page-faq .faq-pulse__label {
  margin: 0 0 1rem;
  color: var(--cyan);
}

.page-faq .faq-pulse__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-faq .faq-pulse__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-faq .faq-pulse .stat__value {
  display: block;
  color: var(--paper);
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  line-height: 1.05;
  letter-spacing: 0.02em;
}

.page-faq .faq-pulse__unit {
  font-size: 0.62em;
  margin-left: 0.15em;
  color: var(--cyan);
}

.page-faq .faq-pulse .stat__label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.78rem;
  line-height: 1.5;
  color: rgba(244, 239, 230, 0.72);
}

/* ---------- 设备图 ---------- */
.page-faq .device-figure {
  margin: 0;
  position: relative;
}

.page-faq .device-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: var(--radius-m);
  background: var(--ink);
}

.page-faq .device-figure figcaption {
  margin-top: 0.6rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--orange);
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 30ch;
}

@media (min-width: 860px) {
  .page-faq .device-figure {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
  }
}

/* ---------- 收尾 ---------- */
.page-faq .faq-chapter--end {
  border-top: 0;
  padding-top: clamp(2rem, 5vw, 3.5rem);
}

.page-faq .faq-end {
  position: relative;
  border-radius: var(--radius-l);
  background: var(--green);
  color: var(--paper);
  padding: clamp(1.5rem, 4vw, 2.75rem);
  overflow: hidden;
}

.page-faq .faq-end::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -70px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(46, 211, 226, 0.32), rgba(46, 211, 226, 0) 68%);
  pointer-events: none;
}

.page-faq .faq-end__head {
  position: relative;
  max-width: 52ch;
}

.page-faq .faq-end .eyebrow {
  color: var(--cyan);
}

.page-faq .faq-end__title {
  color: var(--paper);
  margin: 0.3rem 0 0;
}

.page-faq .faq-end__desc {
  margin: 0.75rem 0 0;
  color: rgba(244, 239, 230, 0.82);
  line-height: 1.85;
}

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

.page-faq .faq-end__panel {
  position: relative;
  margin-top: clamp(1.25rem, 3vw, 2rem);
  padding-top: clamp(1.1rem, 3vw, 1.6rem);
  border-top: 1px solid var(--line-paper);
}

.page-faq .faq-end__panel-label {
  margin: 0 0 0.9rem;
  color: rgba(244, 239, 230, 0.66);
}

.page-faq .faq-checklist {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-faq .faq-checklist {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.6rem 1.5rem;
  }
}

.page-faq .faq-checklist li {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
  font-size: 0.9rem;
  line-height: 1.6;
  color: rgba(244, 239, 230, 0.86);
}

.page-faq .faq-checklist__k {
  flex: none;
  min-width: 6.4em;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .faq-end__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: clamp(1.2rem, 3vw, 1.75rem);
}

.page-faq .faq-copy {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.1rem;
  text-align: left;
  line-height: 1.25;
}

.page-faq .faq-copy__k {
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  opacity: 0.78;
}

.page-faq .faq-copy__v {
  font-size: 0.85rem;
  letter-spacing: 0.01em;
}

.page-faq .faq-copy.is-copied {
  background: var(--cyan);
  color: var(--ink);
}

@media (max-width: 520px) {
  .page-faq .faq-end__actions .btn {
    width: 100%;
    justify-content: center;
  }
  .page-faq .faq-copy {
    align-items: center;
  }
}

/* ---------- 动效与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__link,
  .page-faq .qa__mark::after,
  .page-faq .qa__q {
    transition: none;
  }
}
</style>