.page-faq {
  --faq-gap: clamp(1.5rem, 3.2vw, 3rem);
  --faq-line: 1px solid var(--line);
  display: block;
  padding-bottom: clamp(3rem, 8vw, 6rem);
  overflow-x: hidden;
}

.page-faq .breadcrumbs {
  margin: 1.5rem 0 1.25rem;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: 0.5rem;
}

.page-faq .faq-hero__top {
  display: grid;
  gap: 1.25rem;
}

.page-faq .faq-hero .eyebrow {
  margin: 0 0 0.85rem;
}

.page-faq .faq-hero h1.t-display {
  margin: 0;
  max-width: 24ch;
}

.page-faq .faq-hero__lead {
  margin: 1.15rem 0 0;
  max-width: 64ch;
  color: var(--silver);
}

.page-faq .faq-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__ann {
  display: none;
  margin: 0;
  color: var(--mist);
}

.page-faq .faq-hero__media {
  margin: 2.25rem 0 0;
}

.page-faq .faq-hero__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--line);
}

@media (min-width: 1024px) {
  .page-faq .faq-hero__top {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    column-gap: 2rem;
  }

  .page-faq .faq-hero__ann {
    display: block;
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
    padding-top: 0.4rem;
  }
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  gap: var(--faq-gap);
  margin-top: clamp(2.5rem, 6vw, 4.25rem);
}

@media (min-width: 1024px) {
  .page-faq .faq-shell {
    grid-template-columns: 13.5rem minmax(0, 1fr);
    column-gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--status-h) + 2rem);
  }
}

/* ---------- 分类轨道 ---------- */
.page-faq .faq-rail {
  border-top: var(--faq-line);
  padding-top: 1.15rem;
}

.page-faq .faq-rail__cap {
  margin: 0 0 0.9rem;
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  color: var(--mist);
}

.page-faq .faq-rail__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.125rem;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.55rem 0.6rem;
  border-left: 2px solid transparent;
  color: var(--silver);
  font-size: 0.9375rem;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: #fff;
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, rgba(34, 211, 238, 0.12), transparent);
}

.page-faq .faq-rail__num {
  font-size: 0.75rem;
  color: var(--cyan);
}

.page-faq .faq-rail__ann {
  display: none;
}

@media (min-width: 1024px) {
  .page-faq .faq-rail__ann {
    display: block;
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
    margin: 1.75rem 0 0;
    color: var(--mist);
  }
}

/* ---------- 筛选 ---------- */
.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-bottom: 1rem;
  border-bottom: var(--faq-line);
}

.page-faq .faq-filter .filter__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: transparent;
  color: var(--silver);
  font: inherit;
  font-size: 0.875rem;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .faq-filter .filter__btn:hover,
.page-faq .faq-filter .filter__btn:focus-visible {
  color: #fff;
  border-color: var(--cyan);
}

.page-faq .faq-filter .filter__btn.is-active {
  color: #fff;
  border-color: rgba(168, 85, 247, 0.55);
  background: rgba(168, 85, 247, 0.14);
}

.page-faq .faq-count {
  font-size: 0.75rem;
  color: var(--mist);
}

.page-faq .faq-filter .filter__btn.is-active .faq-count {
  color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-faq .faq-stage {
  margin-top: clamp(2.5rem, 5vw, 3.75rem);
  border-top: var(--faq-line);
  padding-top: 1.5rem;
}

.page-faq .faq-stage:first-of-type {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-faq .faq-stage__head {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.page-faq .faq-stage__no {
  margin: 0;
  font-size: 0.8125rem;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-faq .faq-stage__head h2 {
  margin: 0;
}

.page-faq .faq-stage__desc {
  margin: 0;
  max-width: 60ch;
  color: var(--mist);
  font-size: 0.9375rem;
  line-height: 1.75;
}

@media (min-width: 720px) {
  .page-faq .faq-stage__head {
    grid-template-columns: 4.5rem minmax(0, 1fr);
    column-gap: 1.25rem;
    row-gap: 0.4rem;
  }

  .page-faq .faq-stage__no {
    grid-column: 1;
    grid-row: 1 / span 2;
    padding-top: 0.55rem;
  }

  .page-faq .faq-stage__head h2 {
    grid-column: 2;
    grid-row: 1;
  }

  .page-faq .faq-stage__desc {
    grid-column: 2;
    grid-row: 2;
  }
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(21, 27, 36, 0.6), rgba(17, 21, 28, 0.15));
  transition: box-shadow 0.25s var(--ease), background 0.25s var(--ease);
}

.page-faq .qa:last-of-type {
  border-bottom: 1px solid var(--line);
}

.page-faq .qa[open] {
  box-shadow: inset 2px 0 0 var(--cyan);
  background: linear-gradient(180deg, rgba(34, 211, 238, 0.07), rgba(17, 21, 28, 0.2));
}

.page-faq .qa__q {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr) 1.1rem;
  gap: 0.7rem;
  align-items: start;
  padding: 1.05rem 0.9rem;
  cursor: pointer;
  list-style: none;
  transition: background 0.2s var(--ease);
}

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

.page-faq .qa__q:hover {
  background: rgba(34, 211, 238, 0.05);
}

.page-faq .qa__idx {
  padding-top: 0.35rem;
  font-size: 0.75rem;
  color: var(--cyan);
}

.page-faq .qa__text {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.6;
  color: #E8EEF6;
}

.page-faq .qa__mark {
  position: relative;
  width: 1rem;
  height: 1rem;
  margin-top: 0.45rem;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--mist);
  transition: transform 0.25s var(--ease), background 0.25s var(--ease);
}

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

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

.page-faq .qa[open] .qa__mark::before {
  background: var(--cyan);
}

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

.page-faq .qa__a {
  padding: 0 1.1rem 1.35rem 4rem;
}

.page-faq .qa__a p {
  margin: 0 0 0.85rem;
}

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

.page-faq .qa__a .t-small {
  color: var(--mist);
}

.page-faq .qa__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 211, 238, 0.35);
}

.page-faq .qa__a a:hover,
.page-faq .qa__a a:focus-visible {
  border-bottom-color: var(--cyan);
}

@media (max-width: 560px) {
  .page-faq .qa__a {
    padding: 0 1.1rem 1.25rem 1.1rem;
  }

  .page-faq .qa__q {
    grid-template-columns: 2rem minmax(0, 1fr) 1rem;
    gap: 0.5rem;
  }
}

/* ---------- 步骤编号 ---------- */
.page-faq .faq-steps {
  counter-reset: faqstep;
  margin: 0 0 0.9rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.65rem;
}

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

.page-faq .faq-steps li {
  counter-increment: faqstep;
  position: relative;
  padding-left: 2.2rem;
  color: var(--silver);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.page-faq .faq-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.15rem;
  padding: 0.05rem 0.32rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--cyan);
}

/* ---------- 批次号复制 ---------- */
.page-faq .faq-copy {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0.35rem 0 0.9rem;
  padding: 0.45rem 0.8rem;
  border: 1px dashed rgba(34, 211, 238, 0.45);
  border-radius: var(--r);
  background: rgba(34, 211, 238, 0.07);
  color: var(--cyan);
  font-size: 0.875rem;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .faq-copy::after {
  content: "点击复制";
  font-family: var(--sans);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-faq .faq-copy.is-copied {
  border-color: var(--cyan);
  background: rgba(34, 211, 238, 0.16);
}

.page-faq .faq-copy.is-copied::after {
  content: "已复制";
  color: var(--cyan);
}

/* ---------- 库存状态表 ---------- */
.page-faq .faq-stock {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 1.75rem;
}

.page-faq .faq-status {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-faq .faq-status li {
  display: grid;
  gap: 0.35rem;
  padding: 0.9rem 1rem;
  background: var(--panel);
}

.page-faq .faq-status__name {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: #E8EEF6;
  line-height: 1.6;
}

.page-faq .faq-status__name .tag {
  flex: none;
}

.page-faq .faq-status__desc {
  color: var(--mist);
  font-size: 0.875rem;
  line-height: 1.7;
}

.page-faq .faq-stock__media {
  margin: 0;
}

.page-faq .faq-stock__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border: 1px solid var(--line);
}

@media (min-width: 860px) {
  .page-faq .faq-stock {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
    column-gap: 1.75rem;
  }
}

/* ---------- 年限刻度 ---------- */
.page-faq .faq-scale {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.4rem;
  margin: 1.1rem 0 0.9rem;
  padding: 0.9rem 0.75rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(226, 232, 240, 0.06), transparent);
}

.page-faq .faq-scale__tick {
  display: grid;
  gap: 0.5rem;
  justify-items: center;
}

.page-faq .faq-scale__bar {
  display: block;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, #94A3B8, #E2E8F0);
}

.page-faq .faq-scale__tick:nth-child(1) .faq-scale__bar { opacity: 0.35; }
.page-faq .faq-scale__tick:nth-child(2) .faq-scale__bar { opacity: 0.48; }
.page-faq .faq-scale__tick:nth-child(3) .faq-scale__bar { opacity: 0.62; }
.page-faq .faq-scale__tick:nth-child(4) .faq-scale__bar { opacity: 0.76; }
.page-faq .faq-scale__tick:nth-child(5) .faq-scale__bar { opacity: 0.88; }
.page-faq .faq-scale__tick:nth-child(6) .faq-scale__bar { opacity: 1; }

.page-faq .faq-scale__tick b {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--silver);
}

/* ---------- 联系支持 ---------- */
.page-faq .faq-stage--contact {
  border-top-color: rgba(34, 211, 238, 0.35);
}

.page-faq .faq-contact {
  margin-top: 0.25rem;
}

.page-faq .faq-contact .panel__body {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-faq .faq-contact__btn {
  align-self: flex-start;
  margin-top: 1rem;
}

@media (min-width: 860px) {
  .page-faq .faq-contact {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 1.5rem;
  }
}
</main>