.page-faq {
  --faq-rail-w: 260px;
  --faq-accent: var(--orange);
}

/* ---------- 页头 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: 20px;
  padding: clamp(28px, 5vw, 64px) 0 clamp(22px, 3vw, 40px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 5vw, 60px);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--mist);
  max-width: 22ch;
  text-wrap: balance;
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.75;
  color: var(--steel);
}

.page-faq .faq-hero__facts {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
}

.page-faq .faq-hero__facts li {
  display: grid;
  gap: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--faq-accent);
}

.page-faq .faq-fk {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--steel);
  text-transform: uppercase;
}

.page-faq .faq-fv {
  font-family: var(--font-mono);
  font-size: clamp(15px, 1.6vw, 18px);
  color: var(--mist);
  letter-spacing: 0.02em;
}

/* ---------- 布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
  padding: clamp(26px, 3.4vw, 52px) 0 clamp(48px, 6vw, 96px);
}

/* ---------- 左侧目录 ---------- */
.page-faq .faq-rail {
  align-self: start;
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
  counter-reset: faqcount;
}

.page-faq .faq-rail__list li {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 10px 12px 12px;
  border-left: 2px solid transparent;
  color: var(--mist);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.45;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  background-color: var(--ink-2);
  border-left-color: var(--faq-accent);
  color: var(--orange-soft);
}

.page-faq .faq-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel);
  flex: 0 0 auto;
}

.page-faq .faq-rail__hint {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel);
}

.page-faq .faq-rail__hint a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 211, 238, 0.4);
}

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

/* ---------- 问答主体 ---------- */
.page-faq .faq-body {
  min-width: 0;
}

.page-faq .faq-sec {
  padding: clamp(26px, 4vw, 46px) 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .faq-sec__head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(16px, 2.2vw, 26px);
}

.page-faq .faq-sec__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(21px, 2.6vw, 32px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--mist);
  max-width: 26ch;
}

/* ---------- 图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(20px, 2.4vw, 30px);
}

.page-faq .faq-figure--narrow {
  max-width: 420px;
}

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

/* ---------- 手风琴条目 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-item summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 16px 44px 16px 0;
  font-size: clamp(15px, 1.45vw, 17px);
  font-weight: 600;
  line-height: 1.55;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

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

.page-faq .faq-item summary:hover,
.page-faq .faq-item summary:focus-visible {
  color: var(--orange-soft);
}

.page-faq .faq-item summary::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--faq-accent);
}

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

.page-faq .faq-item[open] summary::after {
  content: "−";
}

.page-faq .faq-item__body {
  position: relative;
  margin: 0 0 20px 6px;
  padding: 2px 6px 4px 22px;
  border-left: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.78;
  color: var(--steel);
  max-width: 68ch;
}

.page-faq .faq-item__body::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  width: 1px;
  height: 34px;
  background-color: var(--faq-accent);
}

.page-faq .faq-item__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 211, 238, 0.4);
}

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

/* ---------- 提示条 ---------- */
.page-faq .faq-tip {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 16px 18px;
  background-color: var(--ink-2);
  border-left: 3px solid var(--gold);
}

.page-faq .faq-tip__k {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-faq .faq-tip p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--warm);
  max-width: 68ch;
}

/* ---------- 下一步 ---------- */
.page-faq .faq-next {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 36px);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 4.6vw, 80px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--rail) + 20px);
    padding-right: 4px;
  }

  .page-faq .faq-sec {
    padding: clamp(30px, 3.6vw, 52px) 0;
  }

  .page-faq .faq-figure--narrow {
    max-width: 460px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    grid-template-areas:
      "eyebrow eyebrow"
      "title lede"
      "facts facts";
    column-gap: clamp(32px, 5vw, 84px);
    align-items: end;
  }

  .page-faq .faq-hero > .eyebrow { grid-area: eyebrow; }
  .page-faq .faq-hero h1 { grid-area: title; }
  .page-faq .faq-hero__lede { grid-area: lede; }
  .page-faq .faq-hero__facts { grid-area: facts; }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__list a,
  .page-faq .faq-item summary {
    transition: none;
  }
}
</