.page-faq {
  --faq-rail-w: 200px;
  --faq-sticky: 104px;
  display: block;
  background: var(--ink);
  color: var(--white);
  padding-bottom: clamp(48px, 8vw, 110px);
  overflow-x: hidden;
}

/* 首屏 */
.page-faq .faq-hero {
  position: relative;
  padding-top: clamp(88px, 13vw, 148px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: 8vw;
  right: -12vw;
  width: clamp(180px, 34vw, 420px);
  height: clamp(180px, 34vw, 420px);
  background: linear-gradient(135deg, var(--cyan) 0%, var(--cyan-deep) 100%);
  opacity: 0.14;
  transform: rotate(20deg);   /* 对角切割装饰块 */
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 2;
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  line-height: 1.02;
  letter-spacing: 0.01em;
  max-width: 20ch;
}

.page-faq .faq-hero__lede {
  margin-top: 18px;
  max-width: 62ch;
}

.page-faq .faq-hero__facts {
  display: grid;
  gap: 16px;
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
}

.page-faq .faq-hero__facts li {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0 8px;
  padding-left: 12px;
  border-left: 3px solid var(--cyan);
}

.page-faq .faq-hero__num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-faq .faq-hero__unit {
  font-size: 13px;
  color: var(--amber);
  letter-spacing: 0.06em;
}

.page-faq .faq-hero__txt {
  flex: 1 1 100%;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-faq .faq-hero__media {
  margin-top: clamp(30px, 5vw, 56px);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.06) brightness(0.9);
}

/* 主体骨架 */
.page-faq .faq-shell {
  margin-top: clamp(36px, 6vw, 70px);
}

/* 左侧分类锚点 */
.page-faq .faq-rail {
  margin-bottom: clamp(24px, 4vw, 36px);
}

.page-faq .faq-rail__label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-rail__link {
  display: block;
  white-space: nowrap;
  padding: 9px 15px;
  border: 2px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--white);
  font-size: 13px;
  text-decoration: none;
  transition: background-color 180ms ease, color 180ms ease, border-color 180ms ease;
}

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

.page-faq .faq-rail__link.is-active {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  font-weight: 700;
}

/* 分组 */
.page-faq .faq-group {
  margin-bottom: clamp(44px, 7vw, 84px);
  scroll-margin-top: 104px;
}

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

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-top: 16px;
  border-top: 3px solid var(--line);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.02em;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-faq .faq-group__note {
  margin: 12px 0 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-figure {
  margin: clamp(20px, 3vw, 28px) 0 0;
}

/* 折叠问答 */
.page-faq .faq-list {
  margin-top: clamp(20px, 3vw, 28px);
}

.page-faq .faq-item {
  margin-bottom: 10px;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: 4px 4px 0 var(--line);
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.page-faq .faq-item[open] {
  border-color: var(--cyan);
  box-shadow: 4px 4px 0 var(--teal-ink);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 16px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--white);
  cursor: pointer;
  list-style: none;
  transition: color 180ms ease;
}

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

.page-faq .faq-item__q::before {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.3;
  color: var(--cyan);
}

.page-faq .faq-item[open] .faq-item__q::before {
  content: "–";
  color: var(--amber);
}

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

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -4px;
}

.page-faq .faq-item__a {
  padding: 0 16px 18px 46px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
}

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

.page-faq .faq-item__a a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

/* 收尾联系块 */
.page-faq .faq-group--contact {
  margin-bottom: 0;
}

.page-faq .faq-touch {
  position: relative;
  padding: clamp(22px, 4vw, 40px);
  background: var(--cream);
  color: var(--brown);
  border: 3px solid var(--brown);
  box-shadow: 10px 10px 0 var(--teal-ink);
}

.page-faq .faq-touch__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--amber-ink);
  letter-spacing: 0.06em;
}

.page-faq .faq-touch__title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  color: var(--brown);
}

.page-faq .faq-touch__lede {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--brown);
}

.page-faq .faq-touch__list {
  display: grid;
  gap: 16px;
  margin: 24px 0 0;
}

.page-faq .faq-touch__list > div {
  padding-left: 12px;
  border-left: 4px solid var(--amber-ink);
}

.page-faq .faq-touch__list dt {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--amber-ink);
}

.page-faq .faq-touch__list dd {
  margin: 5px 0 0;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--brown);
  word-break: break-word;
}

.page-faq .faq-touch__more {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--brown);
}

.page-faq .faq-touch__more a {
  color: var(--brown);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--amber-ink);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-faq .faq-touch__more a:hover {
  color: var(--amber-ink);
}

/* 图片兜底 */
.page-faq img {
  max-width: 100%;
  height: auto;
}

/* 中屏 */
@media (min-width: 640px) {
  .page-faq .faq-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

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

/* 桌面：左侧固定分类栏 + 右侧问答 */
@media (min-width: 900px) {
  .page-faq .faq-shell {
    display: grid;
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-sticky);
    margin-bottom: 0;
  }

  .page-faq .faq-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__list li + li {
    margin-top: 6px;
  }

  .page-faq .faq-rail__link {
    border-radius: 0;
    border-left-width: 5px;
    padding: 10px 12px;
  }

  .page-faq .faq-rail__link.is-active {
    background: var(--panel);
    border-color: var(--line);
    border-left-color: var(--cyan);
    color: var(--cyan);
    box-shadow: 4px 4px 0 var(--line);
  }

  .page-faq .faq-item__q {
    font-size: 16px;
    padding: 17px 20px;
  }

  .page-faq .faq-item__a {
    padding: 0 20px 20px 50px;
  }
}

/* 宽屏微调 */
@media (min-width: 1180px) {
  .page-faq {
    --faq-rail-w: 220px;
  }

  .page-faq .faq-hero__facts {
    max-width: 900px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-rail__link {
    transition: none;
  }
}