.page-faq {
  --faq-gap: clamp(2.5rem, 6vw, 4.5rem);
  background: var(--ink);
  color: var(--frost);
}

/* 面包屑与首屏 */
.page-faq .breadcrumb {
  padding-top: clamp(1.25rem, 4vw, 2.5rem);
}

.page-faq .faq-hero {
  padding: clamp(1.75rem, 4vw, 3rem) 0 clamp(2rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__title {
  margin: 0.85rem 0 0;
  max-width: 22ch;
  font-size: clamp(2rem, 5.4vw, 3.9rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-faq .faq-hero__lede {
  margin: 1.25rem 0 0;
  max-width: 44ch;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.75;
  color: var(--mute);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

/* 双栏骨架 */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 5vw, 3rem);
  padding-top: clamp(2rem, 5vw, 3.5rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

/* 左侧分类索引 */
.page-faq .faq-index__title {
  margin: 0 0 0.85rem;
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mute);
}

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

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  color: var(--mute);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 140ms ease, border-color 140ms ease, background-color 140ms ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--frost);
  border-color: var(--green);
  background: rgba(61, 255, 158, 0.08);
}

.page-faq .faq-index__link:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

.page-faq .faq-index__num {
  font-size: 0.78rem;
  color: var(--green);
}

.page-faq .faq-index__note {
  margin: 1.25rem 0 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--mute);
}

.page-faq .faq-index__cta {
  margin-top: 1rem;
}

/* 分组 */
.page-faq .faq-group + .faq-group {
  margin-top: var(--faq-gap);
  padding-top: var(--faq-gap);
  border-top: 1px solid var(--line);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 1rem;
  row-gap: 0.4rem;
  align-items: baseline;
  margin-bottom: 1.75rem;
}

.page-faq .faq-group__num {
  grid-row: 1 / span 2;
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  line-height: 1;
  color: var(--green);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(1.35rem, 2.8vw, 1.9rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-group__note {
  margin: 0;
  max-width: 42ch;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--mute);
}

/* 问答条目 */
.page-faq .faq-list {
  display: grid;
  gap: 0.75rem;
}

.page-faq .faq-item {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--stand);
  transition: border-color 140ms ease, background-color 140ms ease;
}

.page-faq .faq-item:hover,
.page-faq .faq-item:focus-within {
  border-color: var(--green);
  background: linear-gradient(180deg, rgba(61, 255, 158, 0.07), rgba(61, 255, 158, 0.02));
}

.page-faq .faq-q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 1.05rem 1.2rem;
  border: 0;
  background: none;
  color: var(--frost);
  font-family: inherit;
  font-size: clamp(1rem, 1.7vw, 1.14rem);
  font-weight: 700;
  line-height: 1.5;
  text-align: left;
  cursor: pointer;
}

.page-faq .faq-q:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: -2px;
  border-radius: var(--r-md);
}

.page-faq .faq-q__mark {
  position: relative;
  flex: none;
  width: 20px;
  height: 20px;
  margin-top: 0.2rem;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  transition: border-color 140ms ease;
}

.page-faq .faq-q:hover .faq-q__mark {
  border-color: var(--green);
}

.page-faq .faq-q__mark::before,
.page-faq .faq-q__mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 20%;
  right: 20%;
  height: 1.5px;
  background: var(--green);
  transform: translateY(-50%);
}

.page-faq .faq-q__mark::after {
  transform: translateY(-50%) rotate(90deg);
  transition: transform 160ms ease;
}

.page-faq .faq-q[aria-expanded="true"] .faq-q__mark::after {
  transform: translateY(-50%) rotate(0deg);
}

.page-faq .faq-a {
  padding: 0 1.2rem 1.3rem;
  max-width: 60ch;
  font-size: 0.96rem;
  line-height: 1.78;
  color: var(--mute);
}

.page-faq .faq-a p {
  margin: 0 0 0.7rem;
}

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

.page-faq .faq-a strong {
  color: var(--frost);
  font-weight: 700;
}

.page-faq .faq-steps {
  margin: 0.7rem 0 0.7rem;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
  display: grid;
  gap: 0.4rem;
}

.page-faq .faq-steps li {
  display: grid;
  grid-template-columns: 1.5rem 1fr;
  gap: 0.5rem;
  counter-increment: faqstep;
  line-height: 1.7;
}

.page-faq .faq-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.9;
  color: var(--green);
  letter-spacing: 0.04em;
}

.page-faq .faq-bullets {
  margin: 0 0 0.7rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.4rem;
}

.page-faq .faq-bullets li {
  padding-left: 1rem;
  border-left: 1px solid var(--line);
  line-height: 1.7;
}

/* 配图 */
.page-faq .faq-figure {
  margin: 1.5rem 0 0;
}

.page-faq .faq-figure .media-frame {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

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

.page-faq .faq-figure .figure__cap {
  margin-top: 0.75rem;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--mute);
}

/* 反馈通道 */
.page-faq .faq-feedback {
  position: relative;
  margin-top: 1.75rem;
  display: grid;
  gap: 1.75rem;
  padding: clamp(1.5rem, 3.5vw, 2.25rem);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--panel);
  overflow: hidden;
}

.page-faq .faq-feedback::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--green) 0%, var(--teal) 48%, var(--orange) 100%);
}

.page-faq .faq-feedback__title {
  margin: 0.6rem 0 0;
  font-size: clamp(1.15rem, 2.4vw, 1.6rem);
  font-weight: 800;
  line-height: 1.25;
  color: var(--white);
}

.page-faq .faq-flow {
  margin: 1.1rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.5rem;
}

.page-faq .faq-flow__step {
  position: relative;
  padding-left: 1.25rem;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--frost);
}

.page-faq .faq-flow__step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border-radius: var(--pill);
  background: var(--green);
}

.page-faq .faq-flow__step:nth-child(2)::before {
  background: var(--teal);
}

.page-faq .faq-flow__step:nth-child(3)::before {
  background: var(--orange);
}

.page-faq .faq-arrow {
  display: block;
  width: min(140px, 60%);
  height: auto;
  margin: 1rem 0 0;
  color: var(--line);
}

.page-faq .faq-feedback__text {
  margin: 0.9rem 0 0;
  max-width: 42ch;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--mute);
}

.page-faq .faq-feedback__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  margin: 1.25rem 0 0;
}

.page-faq .faq-inline-link {
  position: relative;
  display: inline-block;
  padding-bottom: 2px;
  color: var(--green);
  font-size: 0.92rem;
  text-decoration: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1px;
  transition: background-size 160ms ease;
}

.page-faq .faq-inline-link:hover,
.page-faq .faq-inline-link:focus-visible {
  background-size: 100% 1px;
}

.page-faq .faq-inline-link:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}

.page-faq .faq-contact {
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink);
}

.page-faq .faq-contact__key {
  margin: 0 0 0.25rem;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-faq .faq-contact__value {
  margin: 0 0 1.1rem;
  font-size: clamp(1rem, 2vw, 1.15rem);
  font-weight: 700;
  color: var(--white);
  word-break: break-word;
}

.page-faq .faq-contact__value.num {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.page-faq .faq-contact__note {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--mute);
}

.page-faq .faq-figure--feedback {
  margin-top: 0;
}

/* 中屏以上：双栏与吸顶索引 */
@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(210px, 250px) minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 6.5rem;
  }

  .page-faq .faq-index__list {
    display: grid;
    gap: 0.25rem;
  }

  .page-faq .faq-index__link {
    display: grid;
    grid-template-columns: auto 1fr;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 var(--r-sm) var(--r-sm) 0;
    padding: 0.55rem 0.75rem;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    border-left-color: var(--green);
    border-top-color: transparent;
    border-bottom-color: transparent;
  }

  .page-faq .faq-index__cta {
    display: block;
    width: 100%;
    text-align: center;
  }

  .page-faq .faq-feedback {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(1.5rem, 3vw, 2.5rem);
    align-items: start;
  }

  .page-faq .faq-figure--feedback {
    grid-column: 1 / -1;
  }
}

/* 大屏：反馈区三列错位，图片并入右列 */
@media (min-width: 1280px) {
  .page-faq .faq-group__head {
    grid-template-columns: auto minmax(0, 1fr) minmax(0, 30ch);
    column-gap: 1.5rem;
  }

  .page-faq .faq-group__num {
    grid-row: 1;
  }

  .page-faq .faq-group__note {
    grid-column: 3;
    grid-row: 1;
    align-self: end;
  }

  .page-faq .faq-feedback {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-faq .faq-figure--feedback {
    grid-column: 1 / -1;
    max-width: 1000px;
  }
}

/* 窄屏适配 */
@media (max-width: 599px) {
  .page-faq .faq-hero__title {
    max-width: 100%;
  }

  .page-faq .faq-q {
    padding: 0.95rem 1rem;
  }

  .page-faq .faq-a {
    padding: 0 1rem 1.15rem;
  }

  .page-faq .faq-contact {
    padding: 1rem;
  }

  .page-faq .faq-steps li {
    grid-template-columns: 1.3rem 1fr;
    gap: 0.35rem;
  }
}