.page-faq {
  --faq-pad: clamp(1.1rem, 3vw, 1.6rem);
  --faq-gap: clamp(1rem, 3vw, 1.75rem);
  --faq-sticky: calc(var(--bar-h) + 1.5rem);
  background: var(--c-mist);
  color: var(--c-ink);
  font-family: var(--font-body);
  line-height: 1.8;
}

.page-faq__crumbs {
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
}

/* ---------- 首屏 ---------- */

.page-faq__hero {
  padding-block: clamp(1.75rem, 5vw, 3.5rem) clamp(2rem, 5vw, 3.75rem);
  border-bottom: var(--frame) solid var(--c-ink);
  background:
    linear-gradient(180deg, rgba(91, 192, 190, 0.14) 0%, rgba(244, 247, 245, 0) 62%),
    var(--c-mist);
}

.page-faq__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
}

.page-faq__hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.85rem, 5vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0.6rem 0 1rem;
  max-width: 24ch;
  color: var(--c-deep);
}

.page-faq__hero .lede {
  max-width: 42ch;
  font-size: clamp(1rem, 1.6vw, 1.09rem);
  color: var(--c-ink);
}

.page-faq__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.6rem;
}

.page-faq__signals {
  border: var(--frame) solid var(--c-ink);
  background: var(--c-deep);
  color: var(--c-mist);
  box-shadow: var(--shadow-hard);
  padding: var(--faq-pad);
}

.page-faq__signals-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--c-electric);
  margin: 0 0 0.9rem;
}

.page-faq__signals ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-faq__signals li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  padding-top: 0.7rem;
  border-top: 1px solid rgba(244, 247, 245, 0.22);
  font-size: 0.95rem;
  line-height: 1.65;
}

.page-faq__signals .mono {
  color: var(--c-coral-soft);
  font-weight: 700;
  font-size: 0.85rem;
}

/* ---------- 主体骨架 ---------- */

.page-faq__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-block: clamp(2rem, 5vw, 3.5rem) clamp(2.5rem, 6vw, 4.5rem);
}

.page-faq__index .eyebrow {
  margin-bottom: 0.75rem;
  color: var(--c-slate);
}

.page-faq__index .section-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.1rem;
  border-left: var(--frame) solid var(--c-ink);
}

.page-faq__index .section-rail__link {
  display: block;
  margin-left: calc(var(--frame) * -1);
  padding: 0.5rem 0.7rem;
  border-left: 4px solid transparent;
  color: var(--c-ink);
  font-size: 0.92rem;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-faq__index .section-rail__link:hover,
.page-faq__index .section-rail__link:focus-visible {
  border-left-color: var(--c-coral);
  background: rgba(91, 192, 190, 0.16);
  color: var(--c-deep);
}

.page-faq__index .section-rail__link[aria-current="true"] {
  border-left-color: var(--c-coral);
  background: rgba(255, 107, 74, 0.12);
  color: var(--c-deep);
  font-weight: 700;
}

/* ---------- 章节 ---------- */

.page-faq .faq-block {
  padding-block: clamp(1.75rem, 4vw, 3rem);
  border-top: var(--frame) solid var(--c-ink);
}

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

.page-faq .faq-block h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.35rem, 3vw, 2rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--c-deep);
  margin: 0;
}

.page-faq .faq-block__intro {
  margin: 0.7rem 0 0;
  max-width: 48ch;
  font-size: 0.98rem;
  color: var(--c-slate);
}

/* ---------- 问答卡 ---------- */

.page-faq .qa {
  margin-top: clamp(1rem, 2.4vw, 1.6rem);
  border: var(--frame) solid var(--c-ink);
  background: var(--c-mist);
  box-shadow: 6px 6px 0 var(--c-ink);
}

.page-faq .qa__q {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.85rem;
  align-items: start;
  padding: clamp(0.9rem, 2.2vw, 1.2rem) var(--faq-pad);
  list-style: none;
  cursor: pointer;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1rem, 1.8vw, 1.14rem);
  line-height: 1.5;
  color: var(--c-deep);
}

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

.page-faq .qa__q::after {
  content: "+";
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 1.3rem;
  line-height: 1;
  color: var(--c-coral);
  transform: translateY(0.12em);
}

.page-faq .qa[open] .qa__q::after {
  content: "−";
}

.page-faq .qa__num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-coral);
  padding-top: 0.35em;
}

.page-faq .qa__a {
  margin: 0 var(--faq-pad) clamp(1rem, 2.4vw, 1.35rem);
  padding-top: 0.9rem;
  border-top: 1px solid rgba(16, 24, 32, 0.18);
  font-size: 0.98rem;
}

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

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

.page-faq .qa__path {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: baseline;
  font-size: 0.88rem;
  color: var(--c-slate);
}

.page-faq .qa__path .mono {
  color: var(--c-channel);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-faq .qa__a a {
  color: var(--c-channel);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.page-faq .qa__a a:hover {
  color: var(--c-coral);
}

.page-faq .qa__a .mono {
  font-size: 0.85rem;
  color: var(--c-deep);
}

/* ---------- 图片 ---------- */

.page-faq .page-faq__figure {
  margin: clamp(1rem, 2.6vw, 1.6rem) 0 0;
}

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

.page-faq .media-frame__cap {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--c-slate);
}

/* ---------- 记录清单 ---------- */

.page-faq .faq-records {
  list-style: none;
  margin: clamp(1rem, 2.6vw, 1.5rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.6rem;
}

.page-faq .faq-records li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.7rem 0.9rem;
  border: var(--frame) solid var(--c-ink);
  background: var(--c-warm);
  font-size: 0.94rem;
  line-height: 1.6;
}

.page-faq .faq-records .mono {
  padding-right: 0.65rem;
  border-right: 2px solid var(--c-coral);
  color: var(--c-deep);
  font-weight: 700;
  font-size: 0.84rem;
  white-space: nowrap;
}

/* ---------- 沙岩旧版区 ---------- */

.page-faq .faq-block--sand {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  padding: clamp(1.15rem, 3vw, 1.9rem);
  border: var(--frame) solid var(--c-ink);
  background: var(--c-sand);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-block--sand .qa {
  background: var(--c-warm);
}

.page-faq__contact {
  margin-top: clamp(1rem, 2.6vw, 1.5rem);
  padding-top: clamp(0.9rem, 2.2vw, 1.2rem);
  border-top: var(--frame) solid var(--c-ink);
}

.page-faq__copyline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-items: center;
  margin: 0 0 0.65rem;
}

.page-faq__copyline .mono {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--c-deep);
  word-break: break-all;
}

.page-faq__contact-note {
  margin: 0.9rem 0 0;
  max-width: 50ch;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--c-ink);
}

/* ---------- 深色收束区 ---------- */

.page-faq .faq-block--deep {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  padding: clamp(1.25rem, 3.2vw, 2.2rem);
  border: var(--frame) solid var(--c-ink);
  background: var(--c-deep);
  color: var(--c-mist);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-block--deep h2 {
  color: var(--c-mist);
}

.page-faq .faq-block--deep p {
  max-width: 52ch;
  margin: 0.9rem 0 0;
  font-size: 0.98rem;
  color: rgba(244, 247, 245, 0.92);
}

.page-faq .faq-block--deep a {
  color: var(--c-coral-soft);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.page-faq .faq-block--deep a:hover {
  color: var(--c-mist);
}

.page-faq .faq-block__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-faq .faq-records {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq__hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(1.5rem, 4vw, 3.5rem);
  }
}

@media (min-width: 960px) {
  .page-faq__body {
    grid-template-columns: minmax(180px, 220px) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-faq__index {
    position: sticky;
    top: var(--faq-sticky);
    align-self: start;
  }

  .page-faq .qa--narrow {
    max-width: 84%;
  }

  .page-faq .qa--right {
    margin-left: auto;
    max-width: 86%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition: none !important;
    animation: none !important;
  }
}