.page-faq {
  --faq-edge: rgba(31, 74, 107, .55);
  --faq-answer: #D3DFEA;
  --faq-rule: rgba(36, 28, 22, .18);
  display: block;
  background: var(--ink-900);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: 1.75;
  padding-bottom: 8px;
}

.page-faq h1,
.page-faq h2 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -.01em;
}

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

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: 28px;
  padding-block: 22px 34px;
  border-bottom: 1px solid var(--blueprint-line);
}

.page-faq .faq-hero__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan-live);
}

.page-faq h1 {
  margin: 0 0 14px;
  font-size: clamp(26px, 7.2vw, 39px);
  line-height: 1.22;
  color: var(--cream);
}

.page-faq .faq-hero__text {
  margin: 0;
  max-width: 46ch;
  font-size: var(--fs-16);
  color: var(--slate-muted);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--slate-muted);
}

.page-faq .faq-hero__meta .num {
  display: inline-block;
  margin-right: 4px;
  font-size: var(--fs-20);
  color: var(--cyan-live);
}

.page-faq .faq-hero__visual {
  position: relative;
  min-height: 216px;
  border: 1px solid var(--blueprint-line);
  background: var(--panel-blue);
  overflow: hidden;
}

.page-faq .faq-hero__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, var(--faq-edge) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(0deg, var(--faq-edge) 0 1px, transparent 1px 44px);
}

.page-faq .faq-hero__visual::after {
  content: "";
  position: absolute;
  top: -34%;
  left: -12%;
  width: 62%;
  height: 168%;
  transform: skewX(-6deg);
  background: linear-gradient(90deg, rgba(41, 231, 255, .22), rgba(41, 231, 255, 0));
}

.page-faq .faq-hero__screen {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 20px;
}

.page-faq .faq-hero__q {
  width: 62px;
  height: 62px;
  fill: none;
  stroke: var(--cyan-live);
  stroke-width: 1.3;
  stroke-linecap: round;
  filter: drop-shadow(0 0 12px rgba(41, 231, 255, .5));
}

.page-faq .faq-hero__screen-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--slate-muted);
}

.page-faq .faq-hero__readouts {
  position: absolute;
  z-index: 2;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  padding: 12px 20px 14px;
  border-top: 1px solid var(--blueprint-line);
  background: rgba(7, 24, 43, .68);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--slate-muted);
}

.page-faq .faq-hero__readouts .num {
  margin-right: 4px;
  font-size: var(--fs-20);
  color: var(--orange-signal);
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  padding-block: 4px 0;
}

.page-faq .faq-index {
  padding: 22px 0 10px;
  border-bottom: 1px solid var(--blueprint-line);
}

.page-faq .faq-index__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--slate-muted);
}

.page-faq .faq-index__nav {
  display: grid;
}

.page-faq .faq-index__nav a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 12px;
  row-gap: 2px;
  padding: 11px 12px 11px 14px;
  border-left: 1px solid var(--blueprint-line);
  color: inherit;
  text-decoration: none;
  transition: border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-faq .faq-index__nav a:hover {
  border-left-color: var(--cyan-live);
  background: linear-gradient(90deg, rgba(41, 231, 255, .09), transparent 70%);
}

.page-faq .faq-index__nav a[aria-current="location"] {
  border-left-color: var(--cyan-live);
  background: linear-gradient(90deg, rgba(41, 231, 255, .15), transparent 70%);
}

.page-faq .faq-index__nav a:focus-visible {
  outline: 2px solid var(--cyan-live);
  outline-offset: 2px;
}

.page-faq .faq-index__num {
  padding-top: 3px;
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--cyan-live);
}

.page-faq .faq-index__name {
  font-family: var(--font-head);
  font-size: var(--fs-16);
  font-weight: 700;
}

.page-faq .faq-index__desc {
  grid-column: 2;
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--slate-muted);
}

.page-faq .faq-index__note {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--slate-muted);
}

.page-faq .faq-index__note .num {
  color: var(--orange-signal);
}

/* ---------- 问答分类 ---------- */
.page-faq .faq-cat {
  padding-block: 26px 10px;
  scroll-margin-top: calc(var(--cmd-h) + 16px);
}

.page-faq .faq-cat + .faq-cat {
  border-top: 1px solid var(--blueprint-line);
}

.page-faq .faq-cat .sec-head {
  margin-bottom: 10px;
}

.page-faq .faq-cat .sec-head__title {
  font-size: clamp(20px, 5vw, 25px);
}

.page-faq .faq-cat__lead {
  margin: 0 0 20px;
  max-width: 60ch;
  font-size: var(--fs-15);
  color: var(--slate-muted);
}

.page-faq .faq-fig {
  margin: 0 0 20px;
}

.page-faq .faq-fig .media__frame {
  aspect-ratio: 10 / 7;
  border: 1px solid var(--blueprint-line);
  background: var(--panel-blue);
  overflow: hidden;
}

.page-faq .faq-fig--wide .media__frame {
  aspect-ratio: 2 / 1;
}

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

.page-faq .faq-fig .media__cap {
  padding-top: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: var(--slate-muted);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-q {
  margin: 0 0 10px;
  border: 1px solid var(--blueprint-line);
  border-left: 3px solid transparent;
  background: var(--panel-blue);
  transition: border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-faq .faq-q[open] {
  border-left-color: var(--cyan-live);
  background: #102A40;
}

.page-faq .faq-q__sum {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr) 16px;
  gap: 12px;
  align-items: start;
  padding: 14px 16px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-head);
  font-size: var(--fs-16);
  font-weight: 700;
  line-height: 1.55;
  color: var(--cream);
}

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

.page-faq .faq-q__sum:focus-visible {
  outline: 2px solid var(--cyan-live);
  outline-offset: -2px;
}

.page-faq .faq-q__icon {
  display: block;
  margin-top: 3px;
  color: var(--cyan-live);
}

.page-faq .faq-q__icon svg {
  display: block;
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
}

.page-faq .faq-q__sign {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 6px;
}

.page-faq .faq-q__sign::before,
.page-faq .faq-q__sign::after {
  content: "";
  position: absolute;
  background: var(--orange-signal);
  transition: transform var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-faq .faq-q__sign::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .faq-q__sign::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-faq .faq-q[open] .faq-q__sign::before {
  background: var(--cyan-live);
}

.page-faq .faq-q[open] .faq-q__sign::after {
  transform: scaleY(0);
}

.page-faq .faq-q__body {
  padding: 0 18px 16px 18px;
  font-size: var(--fs-15);
  color: var(--faq-answer);
}

.page-faq .faq-q__body p {
  margin: 0 0 8px;
}

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

/* ---------- 口径说明面板 ---------- */
.page-faq .faq-caliber {
  margin-top: 38px;
  border-top: 1px solid var(--blueprint-line);
  border-bottom: 1px solid var(--blueprint-line);
  background:
    radial-gradient(130% 90% at 82% 0%, rgba(41, 231, 255, .14), transparent 58%),
    linear-gradient(180deg, rgba(14, 36, 56, .95), rgba(7, 24, 43, .98));
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  scroll-margin-top: calc(var(--cmd-h) + 16px);
}

.page-faq .faq-caliber__inner {
  padding-block: 30px 34px;
}

.page-faq .faq-caliber .sec-head {
  margin-bottom: 10px;
}

.page-faq .faq-caliber .sec-head__title {
  font-size: clamp(20px, 5vw, 25px);
}

.page-faq .faq-caliber__lead {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-15);
  color: var(--slate-muted);
}

.page-faq .lens {
  margin-top: 22px;
}

.page-faq .lens__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}

.page-faq .lens__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--blueprint-line);
}

.page-faq .lens__tab {
  padding: 8px 14px;
  border: 1px solid var(--blueprint-line);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--slate-muted);
  cursor: pointer;
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-faq .lens__tab:hover {
  border-color: var(--cyan-live);
  color: var(--cyan-live);
}

.page-faq #lens-live:checked ~ .lens__tabs .lens__tab[for="lens-live"],
.page-faq #lens-final:checked ~ .lens__tabs .lens__tab[for="lens-final"] {
  border-color: var(--cyan-live);
  background: var(--cyan-live);
  color: var(--ink-900);
}

.page-faq .lens__radio:focus-visible ~ .lens__tabs {
  outline: 2px solid var(--cyan-live);
  outline-offset: 4px;
}

.page-faq .lens__panel {
  display: none;
  padding-top: 18px;
  font-size: var(--fs-15);
  color: var(--faq-answer);
}

.page-faq .lens__panel p {
  margin: 0 0 10px;
  max-width: 68ch;
}

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

.page-faq #lens-live:checked ~ .lens__panels .lens__panel--live {
  display: block;
}

.page-faq #lens-final:checked ~ .lens__panels .lens__panel--final {
  display: block;
}

.page-faq .faq-caliber__flag {
  margin: 22px 0 24px;
  padding: 10px 14px;
  border-left: 3px solid var(--amber-flag);
  background: rgba(255, 194, 75, .1);
  font-size: var(--fs-15);
  color: var(--cream);
}

.page-faq .faq-caliber__flag .num {
  color: var(--amber-flag);
}

.page-faq .faq-caliber .faq-fig {
  margin-bottom: 0;
}

/* ---------- 联系引导 ---------- */
.page-faq .faq-help {
  background: var(--cream);
  color: var(--brown-ink);
}

.page-faq .faq-help__inner {
  display: grid;
  gap: 26px;
  padding-block: 38px 46px;
}

.page-faq .faq-help__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: rgba(36, 28, 22, .58);
}

.page-faq .faq-help h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 5.6vw, 31px);
  line-height: 1.3;
  color: var(--brown-ink);
}

.page-faq .faq-help p {
  margin: 0 0 12px;
  font-size: var(--fs-16);
  line-height: 1.75;
}

.page-faq .faq-help__tip {
  color: rgba(36, 28, 22, .72);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-faq .faq-help__rows {
  margin: 0;
  display: grid;
}

.page-faq .faq-help__row {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 12px 0;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-help__row dt {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: rgba(36, 28, 22, .6);
}

.page-faq .faq-help__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-15);
  word-break: break-word;
}

.page-faq .faq-help__value--text {
  font-family: var(--font-body);
}

.page-faq .faq-help__note {
  margin: 16px 0 0;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: rgba(36, 28, 22, .66);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-q__body {
    padding-left: 48px;
  }

  .page-faq .faq-hero__visual {
    min-height: 250px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    gap: 48px;
    padding-block: 40px 48px;
  }

  .page-faq .faq-hero__visual {
    min-height: 300px;
  }

  .page-faq .faq-body {
    display: grid;
    grid-template-columns: 320px minmax(0, 1fr);
    gap: 52px;
    padding-block: 32px 0;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--cmd-h) + 24px);
    align-self: start;
    padding-top: 0;
    border-bottom: 0;
  }

  .page-faq .faq-cat {
    padding-block: 34px 14px;
  }

  .page-faq .faq-caliber__inner {
    padding-block: 44px 48px;
  }

  .page-faq .faq-help__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 52px;
    padding-block: 52px 60px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-q,
  .page-faq .faq-q__sign::before,
  .page-faq .faq-q__sign::after,
  .page-faq .faq-index__nav a,
  .page-faq .lens__tab {
    transition: none;
  }
}
</main>