.page-faq {
  --faq-ease: cubic-bezier(.22, .61, .36, 1);
  display: block;
  background:
    radial-gradient(1100px 520px at 88% -10%, rgba(23, 224, 208, .10), transparent 62%),
    radial-gradient(940px 540px at 4% 24%, rgba(63, 123, 255, .10), transparent 60%);
  padding-bottom: 64px;
}

.page-faq .page-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 18px;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding: 18px 0 4px;
}

.page-faq .faq-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7.6vw, 4.75rem);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--text);
  margin: 14px 0 18px;
  max-width: 17ch;
}

.page-faq .faq-hero__lede {
  max-width: 62ch;
  color: var(--text-dim);
  font-size: 1.0625rem;
  line-height: 1.78;
  margin: 0;
}

/* ---------- 分类索引带 ---------- */

.page-faq .faq-index {
  padding: 38px 0 6px;
}

.page-faq .faq-index__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 4.4vw, 1.9rem);
  line-height: 1.25;
  color: var(--text);
  margin: 8px 0 0;
}

.page-faq .faq-index__band {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 22px;
}

.page-faq .faq-index__item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 16px 18px;
  border-radius: var(--r-m);
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  text-decoration: none;
  overflow: hidden;
  transition: transform .3s var(--faq-ease), border-color .3s var(--faq-ease), background .3s var(--faq-ease);
}

.page-faq .faq-index__item:hover,
.page-faq .faq-index__item:focus-visible {
  transform: translateY(-3px);
  border-color: var(--line);
  background: var(--ink-700);
}

.page-faq .faq-index__item .index-band__num {
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-faq .faq-index__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--text);
}

.page-faq .faq-index__count {
  font-family: var(--font-mono);
  font-size: .8125rem;
  color: var(--text-dim);
}

.page-faq .faq-index__bar {
  display: block;
  height: 3px;
  border-radius: 3px;
  margin-top: 6px;
  width: var(--w, 60%);
  background: linear-gradient(90deg, var(--cyan), var(--blue));
  opacity: .85;
}

/* ---------- 筛选 ---------- */

.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 4px;
}

.page-faq .faq-filter .filter-btn {
  font: inherit;
  font-size: .875rem;
  line-height: 1;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  transition: color .25s var(--faq-ease), border-color .25s var(--faq-ease), background .25s var(--faq-ease);
}

.page-faq .faq-filter .filter-btn:hover {
  color: var(--text);
  border-color: var(--cyan-deep);
}

.page-faq .faq-filter .filter-btn[aria-pressed="true"] {
  color: var(--text);
  border-color: var(--violet);
  background: rgba(178, 107, 255, .14);
}

.page-faq .is-filtered-out {
  display: none !important;
}

/* ---------- 问题区块 ---------- */

.page-faq .faq-block {
  padding: 40px 0 8px;
}

.page-faq .faq-block__head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 4px 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-block__idx {
  font-family: var(--font-mono);
  font-size: .875rem;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-faq .faq-block__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 4.6vw, 2rem);
  line-height: 1.22;
  color: var(--text);
  margin: 0;
}

.page-faq .faq-block__note {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .02em;
  color: var(--text-dim);
  margin: 0;
}

.page-faq .faq-list {
  margin-top: 4px;
}

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

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 22px;
  bottom: 22px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--blue));
  opacity: 0;
  transform: scaleY(.15);
  transform-origin: top center;
  transition: opacity .3s var(--faq-ease), transform .38s var(--faq-ease);
}

.page-faq .faq-item[open]::before {
  opacity: 1;
  transform: scaleY(1);
}

.page-faq .faq-item__q {
  display: block;
  position: relative;
  padding: 19px 38px 19px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  transition: color .25s var(--faq-ease);
}

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

.page-faq .faq-item__q::after {
  content: "";
  position: absolute;
  right: 8px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--cyan);
  border-bottom: 1.5px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform .3s var(--faq-ease);
}

.page-faq .faq-item[open] .faq-item__q::after {
  transform: rotate(-135deg);
  top: 27px;
}

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

.page-faq .faq-item__a {
  padding: 0 0 22px;
  color: var(--text-dim);
  font-size: .9375rem;
  line-height: 1.9;
}

.page-faq .faq-item[open] .faq-item__a {
  animation: faq-reveal .34s var(--faq-ease) both;
}

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

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

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

.page-faq .faq-item__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 224, 208, .35);
}

.page-faq .faq-item__a a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 配图 ---------- */

.page-faq .faq-figure {
  margin: 26px 0 0;
  border-radius: var(--r-l);
  overflow: hidden;
  background: linear-gradient(140deg, rgba(23, 224, 208, .14), rgba(63, 123, 255, .12) 58%, rgba(178, 107, 255, .10));
}

.page-faq .faq-figure img,
.page-faq .verify-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-figure__cap {
  padding: 12px 16px 14px;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-faq .verify-visual {
  margin: 26px 0 0;
  border-radius: var(--r-l);
  overflow: hidden;
  background: linear-gradient(150deg, rgba(23, 224, 208, .12), rgba(63, 123, 255, .10));
}

/* ---------- 验资步骤 ---------- */

.page-faq .verify-steps {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-faq .verify-step {
  position: relative;
  padding: 18px 18px 20px;
  border-radius: var(--r-m);
  background: linear-gradient(155deg, rgba(23, 224, 208, .10), rgba(63, 123, 255, .07));
  border: 1px solid var(--line-soft);
}

.page-faq .verify-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-faq .verify-step__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.0625rem;
  color: var(--text);
  margin: 8px 0 6px;
}

.page-faq .verify-step__desc {
  margin: 0;
  font-size: .875rem;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-faq .verify-step__tip {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: .75rem;
  line-height: 1.7;
  color: var(--gold);
  max-height: 120px;
  opacity: 1;
  overflow: hidden;
  transition: max-height .36s var(--faq-ease), opacity .3s var(--faq-ease);
}

/* ---------- 保修分叉 ---------- */

.page-faq .warranty-fork {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 20px 0 6px;
}

.page-faq .warranty-fork__lane {
  padding: 18px 18px 20px 20px;
  border-radius: var(--r-m);
  background: var(--ink-800);
  border-left: 3px solid var(--cyan);
}

.page-faq .warranty-fork__lane--core {
  border-left-color: var(--gold);
}

.page-faq .warranty-fork__label {
  margin: 0;
  font-size: .8125rem;
  letter-spacing: .06em;
  color: var(--text-dim);
}

.page-faq .warranty-fork__years {
  margin: 6px 0 8px;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .warranty-fork__lane--core .warranty-fork__years {
  color: var(--gold);
}

.page-faq .warranty-fork__scope {
  margin: 0;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 配件标签 ---------- */

.page-faq .faq-parts__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 4px;
}

/* ---------- 联系通道 ---------- */

.page-faq .faq-channel {
  padding: 46px 0 0;
}

.page-faq .faq-channel__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 4.8vw, 2.1rem);
  line-height: 1.22;
  color: var(--text);
  margin: 8px 0 12px;
}

.page-faq .faq-channel__lede {
  max-width: 62ch;
  color: var(--text-dim);
  margin: 0;
}

.page-faq .faq-channel__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 24px;
}

.page-faq .faq-channel__card {
  padding: 22px 20px 24px;
  border-radius: var(--r-l);
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
}

.page-faq .faq-channel__card--action {
  border-color: rgba(23, 224, 208, .34);
  background: linear-gradient(150deg, rgba(23, 224, 208, .12), rgba(63, 123, 255, .10));
}

.page-faq .faq-channel__kicker {
  margin: 0 0 10px;
  font-size: .8125rem;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-faq .faq-channel__value {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  color: var(--text);
  word-break: break-all;
}

.page-faq .faq-channel__desc {
  margin: 0;
  font-size: .875rem;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-faq .faq-channel__card .btn-row {
  margin-top: 16px;
}

/* ---------- 窄屏兜底 ---------- */

@media (max-width: 420px) {
  .page-faq .faq-item__q {
    font-size: .9375rem;
    padding-right: 32px;
  }

  .page-faq .faq-item::before {
    left: -6px;
  }
}

/* ---------- 平板 ---------- */

@media (min-width: 720px) {
  .page-faq .page-shell {
    padding: 0 32px;
  }

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

  .page-faq .warranty-fork {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

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

  .page-faq .faq-channel__card--action {
    grid-column: 1 / -1;
  }

  .page-faq .verify-steps {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 1024px) {
  .page-faq {
    padding-bottom: 96px;
  }

  .page-faq .faq-hero {
    padding: 34px 0 8px;
  }

  .page-faq .faq-index__band {
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
  }

  .page-faq .faq-block {
    padding: 56px 0 12px;
  }

  .page-faq .faq-block__head {
    padding-bottom: 18px;
  }

  .page-faq .faq-item__q {
    font-size: 1.0625rem;
    padding: 21px 48px 21px 0;
  }

  .page-faq .faq-item__q::after {
    right: 14px;
    top: 26px;
  }

  .page-faq .faq-item[open] .faq-item__q::after {
    top: 29px;
  }

  .page-faq .faq-item__a {
    padding-bottom: 26px;
    padding-left: 2px;
  }

  .page-faq .verify-steps {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-faq .faq-channel__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-faq .faq-channel__card--action {
    grid-column: auto;
  }

  .page-faq .faq-figure {
    margin-top: 34px;
  }
}

@media (hover: hover) and (min-width: 1024px) {
  .page-faq .verify-step__tip {
    max-height: 0;
    opacity: 0;
  }

  .page-faq .verify-step:hover .verify-step__tip,
  .page-faq .verify-step:focus-within .verify-step__tip {
    max-height: 140px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] .faq-item__a {
    animation: none;
  }

  .page-faq .faq-index__item,
  .page-faq .faq-item::before,
  .page-faq .verify-step__tip {
    transition: none;
  }
}

.page-faq {
  --w: 1rem;
}