.page-faq {
  --faq-radius: 4px;
  --faq-line-soft: rgba(124, 154, 143, 0.18);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(64px, 11vw, 112px) 0 clamp(24px, 4vw, 44px);
}

.page-faq .faq-hero__glow {
  position: absolute;
  top: 4%;
  right: -18%;
  width: min(520px, 62vw);
  height: min(520px, 62vw);
  background: radial-gradient(circle at center, rgba(61, 245, 176, 0.15), transparent 68%);
  pointer-events: none;
}

.page-faq .faq-hero h1 {
  margin: 20px 0 0;
  max-width: 20em;
  font-size: clamp(28px, 5.6vw, 48px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-faq .faq-hero .lede {
  max-width: 40em;
  margin-top: 20px;
  font-size: clamp(15px, 2.1vw, 17px);
  color: rgba(233, 245, 240, 0.78);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  margin: 30px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--faq-line-soft);
  font-size: 14px;
  color: var(--sage);
}

.page-faq .faq-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-hero__facts .mono {
  font-size: 19px;
  font-weight: 700;
  color: var(--neon);
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-body {
  padding-top: clamp(16px, 3vw, 32px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 6vw, 56px);
  align-items: start;
}

/* ---------- 侧栏索引 ---------- */
.page-faq .faq-side {
  min-width: 0;
}

.page-faq .faq-rail {
  display: flex;
  gap: 8px;
  margin-top: 14px;
  padding-bottom: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-rail a {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  color: rgba(233, 245, 240, 0.68);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 220ms var(--ease), background 220ms var(--ease), border-color 220ms var(--ease);
}

.page-faq .faq-rail a .mono {
  font-size: 12px;
  color: var(--sage);
  transition: color 220ms var(--ease);
}

.page-faq .faq-rail a .faq-rail__count {
  font-size: 11px;
  color: rgba(124, 154, 143, 0.72);
}

.page-faq .faq-rail a:hover {
  background: rgba(61, 245, 176, 0.06);
  color: var(--mist);
}

.page-faq .faq-rail a[aria-current="true"] {
  color: var(--neon);
  border-bottom-color: var(--neon);
  background: rgba(61, 245, 176, 0.08);
}

.page-faq .faq-rail a[aria-current="true"] .mono {
  color: var(--neon);
}

.page-faq .faq-side__figure {
  display: none;
  margin: 26px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  overflow: hidden;
  background: var(--char);
}

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

/* ---------- 筛选工具条 ---------- */
.page-faq .faq-tools {
  display: grid;
  gap: 18px;
  padding-bottom: 24px;
  margin-bottom: clamp(30px, 5vw, 46px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-tools__title {
  margin: 0;
  font-size: clamp(19px, 2.6vw, 23px);
  font-weight: 800;
  color: var(--mist);
}

.page-faq .faq-tools .note {
  margin: 8px 0 0;
}

.page-faq .faq-tools .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 分组 ---------- */
.page-faq .faq-main {
  min-width: 0;
}

.page-faq .faq-group {
  margin-bottom: clamp(44px, 7vw, 72px);
  scroll-margin-top: 96px;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding-bottom: 16px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-group__num {
  flex: 0 0 auto;
  font-size: clamp(28px, 4.6vw, 42px);
  font-weight: 800;
  line-height: 0.9;
  color: var(--neon);
  opacity: 0.9;
}

.page-faq .faq-group__intro h2 {
  margin: 0;
  font-size: clamp(21px, 3vw, 27px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--mist);
}

.page-faq .faq-group__intro p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--sage);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--faq-line-soft);
}

.page-faq .faq-q {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) 22px;
  gap: 12px;
  align-items: start;
  padding: 17px 2px;
  cursor: pointer;
  list-style: none;
  transition: background 200ms var(--ease);
}

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

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

.page-faq .faq-q:hover {
  background: rgba(61, 245, 176, 0.045);
}

.page-faq .faq-num {
  display: block;
  padding-top: 4px;
  font-size: 12px;
  color: var(--sage);
}

.page-faq .faq-q__text {
  display: block;
  font-size: clamp(15px, 2.2vw, 18px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--mist);
}

.page-faq .faq-q__icon {
  position: relative;
  display: block;
  width: 20px;
  height: 20px;
  margin-top: 3px;
}

.page-faq .faq-q__icon::before,
.page-faq .faq-q__icon::after {
  content: "";
  position: absolute;
  background: var(--neon);
  transition: transform 240ms var(--ease), opacity 240ms var(--ease);
}

.page-faq .faq-q__icon::before {
  left: 0;
  right: 0;
  top: 9px;
  height: 2px;
}

.page-faq .faq-q__icon::after {
  top: 0;
  bottom: 0;
  left: 9px;
  width: 2px;
}

.page-faq .faq-item[open] .faq-q__icon::after {
  transform: scaleY(0);
  opacity: 0.4;
}

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

.page-faq .faq-a {
  padding: 2px 6px 24px 44px;
  animation: faq-open 260ms var(--ease);
}

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

.page-faq .faq-a p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(233, 245, 240, 0.82);
}

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

.page-faq .faq-a ol {
  display: grid;
  gap: 9px;
  margin: 4px 0 12px;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
}

.page-faq .faq-a li {
  position: relative;
  padding-left: 32px;
  font-size: 15px;
  line-height: 1.68;
  color: rgba(233, 245, 240, 0.82);
  counter-increment: faqstep;
}

.page-faq .faq-a li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--amber);
}

/* ---------- 适配对照带 ---------- */
.page-faq .fit-visual {
  margin: 26px 0 6px;
}

.page-faq .fit-visual__figure {
  margin: 0 0 22px;
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  overflow: hidden;
  background: var(--char);
}

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

.page-faq .fit-strip {
  padding: 22px 20px 24px;
  background: var(--char);
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-faq .fit-strip__lead {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--sage);
  max-width: 46em;
}

.page-faq .fit-strip__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .fit-device {
  display: grid;
  gap: 7px;
  padding: 13px 12px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
}

.page-faq .fit-device__w {
  font-size: 12px;
  color: var(--amber);
  letter-spacing: 0.02em;
}

.page-faq .fit-device__bar {
  display: block;
  height: 4px;
  width: var(--span, 40%);
  max-width: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--neon), var(--ice));
  opacity: 0.75;
}

.page-faq .fit-device__name {
  font-size: 14px;
  font-weight: 700;
  color: var(--mist);
}

.page-faq .fit-device__note {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--sage);
}

.page-faq .fit-device--s { --span: 24%; }
.page-faq .fit-device--m { --span: 34%; }
.page-faq .fit-device--l { --span: 52%; }
.page-faq .fit-device--xl { --span: 72%; }
.page-faq .fit-device--xxl { --span: 100%; }

/* ---------- 联系收束 ---------- */
.page-faq .faq-contact {
  padding: clamp(20px, 4vw, 48px) 0 clamp(56px, 9vw, 96px);
}

.page-faq .faq-contact__panel {
  position: relative;
  padding: clamp(26px, 5vw, 52px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-faq .faq-contact__panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 88px;
  height: 3px;
  background: var(--grad);
}

.page-faq .faq-contact__panel h2 {
  margin: 14px 0 0;
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--mist);
  max-width: 22em;
}

.page-faq .faq-contact__lead {
  margin: 16px 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(233, 245, 240, 0.78);
}

.page-faq .faq-contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 28px 0 22px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-contact__item .kicker {
  display: block;
  margin-bottom: 6px;
}

.page-faq .faq-contact__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.5;
  color: var(--mist);
  word-break: break-word;
}

.page-faq .faq-contact__item p.mono {
  color: var(--ice);
}

.page-faq .faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 0;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-a {
    padding-left: 50px;
  }

  .page-faq .faq-a ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 9px 22px;
  }

  .page-faq .fit-strip__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 780px) {
  .page-faq .fit-visual {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-faq .fit-visual__figure {
    margin-bottom: 0;
  }

  .page-faq .faq-a ol {
    grid-template-columns: 1fr;
  }

  .page-faq .faq-contact__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: 256px minmax(0, 1fr);
    gap: clamp(36px, 4vw, 68px);
  }

  .page-faq .faq-side {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-faq .faq-rail {
    display: grid;
    gap: 2px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-faq .faq-rail a {
    display: grid;
    grid-template-columns: 26px minmax(0, 1fr) auto;
    gap: 10px;
    padding: 11px 12px;
    border-bottom: 0;
    border-right: 2px solid transparent;
    white-space: normal;
  }

  .page-faq .faq-rail a[aria-current="true"] {
    border-right-color: var(--neon);
    border-bottom-color: transparent;
  }

  .page-faq .faq-side__figure {
    display: block;
  }

  .page-faq .faq-group__head {
    gap: 22px;
    padding-bottom: 20px;
  }

  .page-faq .faq-q {
    grid-template-columns: 36px minmax(0, 1fr) 24px;
    gap: 14px;
    padding: 19px 4px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-a ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 9px 26px;
  }

  .page-faq .fit-strip__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    align-items: end;
  }
}

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

  .page-faq .faq-q__icon::before,
  .page-faq .faq-q__icon::after,
  .page-faq .faq-rail a {
    transition: none;
  }
}