.page-faq {
  --faq-wrap: 72rem;
  --faq-pad: clamp(1rem, 2.4vw, 1.6rem);
  --faq-gap: clamp(1rem, 2vw, 1.5rem);
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  overflow-x: hidden;
}

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

.page-faq .faq-wrap {
  width: 100%;
  max-width: var(--faq-wrap);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-block: clamp(1.5rem, 4vw, 2.75rem) clamp(2rem, 4vw, 3.25rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(95% 130% at 92% -15%, rgba(23, 75, 58, 0.92), rgba(11, 18, 16, 0) 62%),
    var(--ink);
}

.page-faq .faq-hero .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-faq .faq-hero .breadcrumb a {
  color: var(--cream);
  text-decoration: none;
}

.page-faq .faq-hero .breadcrumb a:hover {
  color: var(--lime);
}

.page-faq .faq-hero .breadcrumb__sep {
  color: var(--steel);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-faq .faq-hero__intro h1 {
  margin: 0.7rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 9vw, 5rem);
  line-height: 0.95;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-hero__intro h1 .hl {
  color: var(--lime);
}

.page-faq .faq-hero__lead {
  max-width: 38rem;
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.08rem);
  color: rgba(244, 247, 239, 0.82);
}

.page-faq .faq-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-chip {
  display: inline-block;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--line-strong);
  background: rgba(18, 48, 39, 0.7);
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

.page-faq .faq-chip--lime {
  border-color: rgba(184, 255, 61, 0.6);
  color: var(--lime);
}

.page-faq .device-frame {
  position: relative;
  margin: 0;
  padding: 0.6rem;
  border: 2px solid var(--line-strong);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-faq .device-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 1000 / 1200;
  object-fit: cover;
  filter: saturate(0.9);
}

.page-faq .device-frame__label {
  position: absolute;
  left: 0.9rem;
  bottom: 1.1rem;
  padding: 0.3rem 0.6rem;
  border: 2px solid var(--brown);
  background: var(--cream);
  color: var(--paper-ink);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  box-shadow: var(--shadow-brutal);
}

/* ---------- 索引 + 问答 ---------- */
.page-faq .faq-shell {
  padding-block: clamp(2rem, 4vw, 3.5rem);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-shell__grid {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.75rem);
}

.page-faq .faq-index {
  padding: 1.1rem;
  border: 1px solid var(--line);
  background: rgba(18, 48, 39, 0.55);
}

.page-faq .faq-index__title {
  margin: 0 0 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-faq .faq-index__list {
  display: grid;
  gap: 0.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-faq .faq-index__list a {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
  padding: 0.45rem 0.3rem;
  border-bottom: 1px dashed rgba(138, 163, 178, 0.2);
  color: var(--white);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-faq .faq-index__list a:hover {
  background: rgba(184, 255, 61, 0.08);
  color: var(--lime);
}

.page-faq .faq-index__list .num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--amber);
}

.page-faq .faq-index__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
}

.page-faq .faq-index__chips a {
  padding: 0.22rem 0.6rem;
  border: 1px solid var(--line-strong);
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .faq-index__chips a:hover {
  border-color: var(--lime);
  color: var(--lime);
}

.page-faq .faq-index__note {
  margin: 1rem 0 0;
  font-size: 0.78rem;
  line-height: 1.6;
  color: rgba(138, 163, 178, 0.9);
}

.page-faq .faq-list {
  display: grid;
  gap: clamp(2rem, 4vw, 3rem);
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--bar-h) + 1.25rem);
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.9rem;
  margin-bottom: 0.9rem;
  padding: 0.6rem 0.85rem;
  border: 2px solid var(--brown);
  background: var(--cream);
  color: var(--paper-ink);
  box-shadow: var(--shadow-brutal);
}

.page-faq .faq-group__num {
  padding: 0.12rem 0.45rem;
  background: var(--brown);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.15rem, 2.6vw, 1.6rem);
  line-height: 1.15;
  color: var(--paper-ink);
}

.page-faq .faq-group__tag {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: rgba(42, 33, 27, 0.68);
}

.page-faq .faq-group__lead {
  margin: 0 0 1rem;
  max-width: 46rem;
  font-size: 0.92rem;
  color: rgba(244, 247, 239, 0.75);
}

.page-faq .faq-item {
  border: 1px solid var(--line);
  border-left: 3px solid rgba(138, 163, 178, 0.35);
  background: var(--panel);
  transition: border-color 0.18s var(--ease), box-shadow 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-faq .faq-item + .faq-item {
  margin-top: 0.6rem;
}

.page-faq .faq-item[open] {
  border-left-color: var(--lime);
  background: #14342a;
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.55);
}

.page-faq .faq-item > summary {
  display: grid;
  grid-template-columns: 1rem 1fr;
  gap: 0.75rem;
  align-items: start;
  padding: 0.9rem var(--faq-pad);
  color: var(--white);
  font-size: 0.97rem;
  font-weight: 600;
  line-height: 1.5;
  cursor: pointer;
  list-style: none;
  transition: color 0.18s var(--ease);
}

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

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

.page-faq .faq-item__sign {
  width: 1rem;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1.45;
  color: var(--lime);
  text-align: center;
}

.page-faq .faq-item__sign::before {
  content: "+";
}

.page-faq .faq-item[open] .faq-item__sign::before {
  content: "–";
}

.page-faq .faq-item__body {
  margin-left: 1.75rem;
  padding: 0.85rem var(--faq-pad) 1.1rem 0;
  border-top: 1px dashed rgba(138, 163, 178, 0.26);
  color: rgba(244, 247, 239, 0.84);
  font-size: 0.94rem;
}

.page-faq .faq-item__body p {
  margin: 0 0 0.7rem;
}

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

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

.page-faq .code {
  padding: 0.05rem 0.35rem;
  border: 1px solid rgba(184, 255, 61, 0.4);
  background: rgba(184, 255, 61, 0.12);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 0.86em;
  white-space: nowrap;
}

/* ---------- 规模带 ---------- */
.page-faq .faq-stats {
  border-block: 1px solid var(--line-strong);
  background: var(--pitch);
}

.page-faq .faq-stats__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem;
  padding-block: clamp(1.5rem, 3vw, 2.25rem);
}

.page-faq .faq-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-faq .faq-stat__label {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.8rem;
  line-height: 1.5;
  color: rgba(244, 247, 239, 0.76);
}

/* ---------- 兜底入口 ---------- */
.page-faq .faq-help {
  padding-block: clamp(2rem, 4vw, 3.5rem);
}

.page-faq .faq-help__figure {
  margin: 0 0 clamp(1.5rem, 3vw, 2.25rem);
  border: 2px solid var(--line-strong);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-help__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 1200 / 700;
  object-fit: cover;
}

.page-faq .faq-help__text {
  max-width: 44rem;
}

.page-faq .faq-help__text h2 {
  margin: 0.5rem 0 0.9rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1.1;
  color: var(--white);
}

.page-faq .faq-help__text > p {
  margin: 0;
  color: rgba(244, 247, 239, 0.82);
}

.page-faq .faq-help__list {
  display: grid;
  gap: 0.5rem;
  margin: 1.1rem 0 1.6rem;
  padding: 0;
  list-style: none;
}

.page-faq .faq-help__list li {
  position: relative;
  padding-left: 1.4rem;
  font-size: 0.92rem;
  color: rgba(244, 247, 239, 0.85);
}

.page-faq .faq-help__list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--amber);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

@media (min-width: 760px) {
  .page-faq .faq-stats__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 0.72fr);
    align-items: end;
  }

  .page-faq .device-frame {
    align-self: stretch;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-shell__grid {
    grid-template-columns: 15.5rem minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--bar-h) + 1.25rem);
  }

  .page-faq .faq-item__body {
    padding-right: calc(var(--faq-pad) + 1rem);
    max-width: 58rem;
  }
}