.page-faq {
  --faq-line: rgba(234, 243, 238, 0.13);
  --faq-cyan-ghost: rgba(53, 214, 255, 0.055);
  --faq-lime-ghost: rgba(180, 255, 57, 0.1);
  position: relative;
  background-color: var(--void);
  color: var(--bone);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ============ 首屏 ============ */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(24px, 4vw, 54px) 0 0;
  border-bottom: 1px solid var(--grid);
  background-image:
    linear-gradient(158deg, rgba(53, 214, 255, 0.13), rgba(7, 9, 15, 0) 58%),
    linear-gradient(22deg, rgba(180, 255, 57, 0.08), rgba(7, 9, 15, 0) 48%);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(to right, var(--grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid) 1px, transparent 1px);
  background-size: 84px 84px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.35) 62%, transparent 92%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.35) 62%, transparent 92%);
  opacity: 0.8;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -16%;
  left: -8%;
  z-index: 0;
  width: 64%;
  height: 48%;
  background: linear-gradient(114deg, rgba(180, 255, 57, 0.16), rgba(53, 214, 255, 0.09) 44%, transparent 74%);
  transform: rotate(-7deg);
  filter: blur(3px);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(12px, 1.8vw, 20px);
}

.page-faq .faq-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(8px, 1.6vw, 18px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-faq .faq-crumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--grid);
}

.page-faq .faq-crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-faq .faq-crumb a:hover,
.page-faq .faq-crumb a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
  outline: none;
}

.page-faq .faq-eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 7vw, 80px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--bone);
  max-width: 15ch;
}

.page-faq .faq-h1 em {
  font-style: normal;
  color: var(--lime);
}

.page-faq .faq-lede {
  margin: 0;
  max-width: 40ch;
  font-size: var(--fs-18);
  line-height: 1.9;
  color: rgba(234, 243, 238, 0.86);
}

.page-faq .faq-hero__fig {
  position: relative;
  z-index: 1;
  margin: clamp(26px, 4vw, 52px) 0 0;
  overflow: hidden;
  border-top: 1px solid var(--grid);
}

.page-faq .faq-hero__fig img {
  display: block;
  width: 100%;
  height: clamp(170px, 32vw, 400px);
  object-fit: cover;
  opacity: 0.9;
}

.page-faq .faq-hero__fig::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 9, 15, 0.5) 0%, transparent 38%, rgba(7, 9, 15, 0.92) 100%);
  pointer-events: none;
}

/* ============ 主体两栏 ============ */
.page-faq .faq-body {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  padding-top: clamp(38px, 5.4vw, 80px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

/* 左侧分组索引 */
.page-faq .faq-nav {
  position: relative;
  padding: 18px 16px 20px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-m);
  background: linear-gradient(152deg, rgba(36, 21, 66, 0.78), rgba(7, 9, 15, 0.42));
}

.page-faq .faq-nav__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-nav__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-faq .faq-nav__list a {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 12px;
  padding: 9px 10px;
  border-radius: var(--radius-s);
  border-left: 2px solid transparent;
  color: var(--bone);
  text-decoration: none;
  font-size: var(--fs-14);
  line-height: 1.5;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}

.page-faq .faq-nav__list a:hover,
.page-faq .faq-nav__list a:focus-visible {
  background: var(--faq-lime-ghost);
  border-left-color: var(--lime);
  color: var(--lime);
  outline: none;
}

.page-faq .faq-nav__no {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 600;
  color: var(--mist);
  letter-spacing: 0.06em;
}

.page-faq .faq-nav__list a:hover .faq-nav__no,
.page-faq .faq-nav__list a:focus-visible .faq-nav__no {
  color: var(--lime);
}

.page-faq .faq-nav__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--grid);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ============ 分组 ============ */
.page-faq .faq-groups {
  display: grid;
  gap: clamp(34px, 5vw, 66px);
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: 110px;
  min-width: 0;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
  padding-bottom: 14px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: var(--fs-34);
  font-weight: 600;
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.02em;
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: var(--fs-34);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--bone);
}

/* 分组内配图 */
.page-faq .faq-shot {
  margin: clamp(18px, 2.6vw, 28px) 0 4px;
  overflow: hidden;
  border: 1px solid var(--grid);
  border-radius: var(--radius-m);
  background: linear-gradient(148deg, rgba(6, 48, 44, 0.72), rgba(7, 9, 15, 0.52));
}

.page-faq .faq-shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  opacity: 0.92;
}

.page-faq .faq-shot figcaption {
  padding: 12px 16px 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ============ 单条问答 ============ */
.page-faq .faq-group__list {
  display: grid;
}

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

.page-faq .faq-item__sum {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: clamp(10px, 2vw, 18px);
  padding: clamp(14px, 2vw, 20px) 4px;
  cursor: pointer;
  list-style: none;
  transition: background var(--t-fast);
}

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

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

.page-faq .faq-item__sum:hover {
  background: var(--faq-cyan-ghost);
}

.page-faq .faq-item__sum:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: -1px;
}

.page-faq .faq-item__no {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.06em;
  white-space: nowrap;
  color: var(--lime);
  background: var(--faq-lime-ghost);
  border: 1px solid rgba(180, 255, 57, 0.24);
  border-radius: var(--radius-s);
  padding: 3px 7px;
  margin-top: 2px;
}

.page-faq .faq-item__q {
  font-size: var(--fs-18);
  font-weight: 600;
  line-height: 1.6;
  color: var(--bone);
  transition: color var(--t-fast);
}

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

.page-faq .faq-item[open] .faq-item__q {
  color: var(--cyan);
}

.page-faq .faq-item__icon {
  position: relative;
  width: 20px;
  height: 20px;
  margin-top: 5px;
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  background: rgba(234, 243, 238, 0.62);
  transition: transform var(--t-mid), background var(--t-fast);
}

.page-faq .faq-item__icon::before {
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  transform: translateY(-50%);
}

.page-faq .faq-item__icon::after {
  left: 50%;
  top: 0;
  width: 1px;
  height: 100%;
  transform: translateX(-50%);
}

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

.page-faq .faq-item[open] .faq-item__icon::before {
  background: var(--lime);
}

.page-faq .faq-item__ans {
  margin: 0 4px clamp(16px, 2.4vw, 24px);
  padding: 14px 18px 16px;
  border-left: 2px solid rgba(53, 214, 255, 0.45);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: rgba(53, 214, 255, 0.05);
  animation: faq-answer-in 420ms cubic-bezier(0.2, 0.7, 0.3, 1) both;
}

.page-faq .faq-item__ans p {
  margin: 0;
  max-width: 42ch;
  font-size: var(--fs-18);
  line-height: 1.9;
  color: rgba(234, 243, 238, 0.88);
}

.page-faq .faq-item__ans p + p {
  margin-top: 10px;
}

.page-faq .faq-kbd {
  font-family: var(--font-mono);
  font-size: 0.94em;
  font-weight: 600;
  color: var(--amber);
  background: rgba(255, 145, 48, 0.1);
  border-radius: var(--radius-s);
  padding: 1px 6px;
  white-space: nowrap;
}

@keyframes faq-answer-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ============ 收尾 ============ */
.page-faq .faq-cta-wrap {
  border-top: 1px solid var(--grid);
  background: linear-gradient(118deg, rgba(74, 15, 36, 0.76) 0%, rgba(7, 9, 15, 0.28) 56%, rgba(7, 9, 15, 0) 100%);
}

.page-faq .faq-cta {
  display: grid;
  justify-items: start;
  gap: clamp(12px, 2vw, 18px);
  padding-top: clamp(32px, 4.6vw, 56px);
  padding-bottom: clamp(48px, 7vw, 90px);
}

.page-faq .faq-cta__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-faq .faq-cta__text {
  margin: 0;
  max-width: 30ch;
  font-size: var(--fs-22);
  font-weight: 600;
  line-height: 1.7;
  color: var(--bone);
}

/* ============ 断点 ============ */
@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(196px, 236px) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-nav {
    position: sticky;
    top: 96px;
  }
}

@media (max-width: 720px) {
  .page-faq .faq-h1 {
    font-size: clamp(30px, 8.6vw, 42px);
    max-width: 100%;
  }

  .page-faq .faq-lede {
    max-width: 100%;
    font-size: var(--fs-14);
  }

  .page-faq .faq-group__no {
    font-size: var(--fs-22);
  }

  .page-faq .faq-group__title {
    font-size: var(--fs-22);
  }

  .page-faq .faq-item__sum {
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: 10px;
  }

  .page-faq .faq-item__icon {
    grid-column: 2;
    margin-top: 2px;
  }

  .page-faq .faq-item__q {
    font-size: var(--fs-14);
    line-height: 1.7;
  }

  .page-faq .faq-item__ans {
    padding: 12px 14px 14px;
    margin-left: 0;
    margin-right: 0;
  }

  .page-faq .faq-item__ans p {
    font-size: var(--fs-14);
    max-width: 100%;
  }

  .page-faq .faq-nav__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px;
  }

  .page-faq .faq-nav__list a {
    padding: 8px 8px;
    font-size: var(--fs-12);
  }

  .page-faq .faq-cta__text {
    font-size: var(--fs-18);
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__ans {
    animation: none;
  }

  .page-faq .faq-item__icon::before,
  .page-faq .faq-item__icon::after,
  .page-faq .faq-item__q,
  .page-faq .faq-nav__list a,
  .page-faq .faq-item__sum {
    transition-duration: 1ms;
  }
}