.page-faq {
  padding-block: clamp(1.5rem, 4vw, 3rem) clamp(3rem, 8vw, 6rem);
}

/* 首屏 */
.page-faq .faq-hero {
  margin-top: 1.25rem;
  padding-top: clamp(1rem, 2.5vw, 1.75rem);
  border-top: 2px solid var(--line-600);
  display: grid;
  gap: 1rem;
  max-width: 64rem;
}

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

.page-faq .faq-hero h1 {
  margin: 0;
  font-size: clamp(2.125rem, 6.5vw, 3.75rem);
  line-height: 1.06;
  letter-spacing: -0.01em;
  font-weight: 700;
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 46rem;
  color: var(--text-300);
  font-size: clamp(0.9375rem, 2vw, 1.0625rem);
  line-height: 1.8;
}

.page-faq .faq-hero__index {
  list-style: none;
  margin: 0.25rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.75rem;
  font-size: 0.875rem;
  color: var(--text-300);
}

.page-faq .faq-hero__index li {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
}

.page-faq .faq-hero__index .mono {
  color: var(--pulse-500);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.page-faq .faq-hero__figure {
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
}

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

/* 主体两栏 */
.page-faq .faq-layout {
  margin-top: clamp(2rem, 5vw, 3.5rem);
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-faq .faq-rail {
  --accent: var(--cool-400);
}

.page-faq .faq-rail__title {
  margin: 0 0 0.75rem;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-300);
}

.page-faq .faq-rail__nav {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.35rem;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-rail__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--line-600);
  color: var(--text-100);
  text-decoration: none;
  font-size: 0.875rem;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-rail__link .mono {
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--text-300);
  transition: color 0.2s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  outline: none;
}

.page-faq .faq-rail__link:hover .mono,
.page-faq .faq-rail__link:focus-visible .mono {
  color: var(--accent);
}

.page-faq .faq-body {
  min-width: 0;
}

/* 分组 */
.page-faq .faq-group + .faq-group {
  margin-top: clamp(3rem, 7vw, 5rem);
}

.page-faq .faq-group--cool { --accent: var(--cool-400); }
.page-faq .faq-group--warm { --accent: var(--warm-400); }
.page-faq .faq-group--pulse { --accent: var(--pulse-500); }
.page-faq .faq-group--violet { --accent: var(--violet-500); }

.page-faq .faq-group__head {
  display: grid;
  gap: 0.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 2px solid var(--line-600);
}

.page-faq .faq-group__num {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.page-faq .faq-group__num::before {
  content: "";
  width: 22px;
  height: 3px;
  background: var(--accent);
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-size: clamp(1.375rem, 3vw, 1.75rem);
  line-height: 1.3;
}

.page-faq .faq-group__note {
  margin: 0;
  color: var(--text-300);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* 问答条目 */
.page-faq .faq-list {
  counter-reset: qa;
  display: grid;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.page-faq .faq-qa {
  counter-increment: qa;
  border: 2px solid var(--line-600);
  background: var(--ink-800);
  transition: border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-faq .faq-qa:hover {
  border-color: var(--accent);
}

.page-faq .faq-qa[open] {
  border-color: var(--accent);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-qa__summary {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: clamp(0.9rem, 2vw, 1.15rem) clamp(0.9rem, 2.5vw, 1.35rem);
  cursor: pointer;
  list-style: none;
  color: var(--text-100);
  font-size: clamp(1rem, 2vw, 1.0625rem);
  font-weight: 600;
  line-height: 1.5;
}

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

.page-faq .faq-qa__summary::marker {
  content: "";
}

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

.page-faq .faq-qa__num {
  flex: 0 0 auto;
  padding-top: 0.28rem;
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.page-faq .faq-qa__num::before {
  content: "Q" counter(qa, decimal-leading-zero);
}

.page-faq .faq-qa__q {
  flex: 1 1 auto;
  min-width: 0;
  overflow-wrap: anywhere;
}

.page-faq .faq-qa__mark {
  flex: 0 0 auto;
  width: 0;
  height: 0;
  margin-top: 0.45rem;
  border-left: 7px solid var(--text-300);
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  transition: transform 0.22s var(--ease), border-left-color 0.22s var(--ease);
}

.page-faq .faq-qa[open] .faq-qa__mark {
  transform: rotate(90deg);
  border-left-color: var(--accent);
}

.page-faq .faq-qa__body {
  padding: 0.9rem clamp(0.9rem, 2.5vw, 1.35rem) clamp(1.1rem, 2.5vw, 1.4rem);
  border-top: 1px solid var(--line-600);
  color: var(--text-300);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.page-faq .faq-qa__body p {
  margin: 0 0 0.75rem;
}

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

.page-faq .faq-qa__scope {
  display: inline-flex;
  align-items: center;
  padding: 0.22rem 0.5rem;
  border: 1px dashed var(--line-600);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  color: var(--text-300);
}

.page-faq .faq-qa__next a {
  color: var(--accent);
  font-size: 0.875rem;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-faq .faq-qa__next a:hover,
.page-faq .faq-qa__next a:focus-visible {
  color: var(--text-100);
  border-bottom-color: var(--text-100);
}

.page-faq .faq-inline-figure {
  margin: clamp(1.5rem, 3.5vw, 2.25rem) 0 0;
}

/* 求助区块 */
.page-faq .faq-help {
  --accent: var(--warm-300);
  margin-top: clamp(3rem, 8vw, 5.5rem);
  padding: clamp(1.5rem, 4vw, 2.75rem);
  border: 2px solid var(--line-600);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard-lg);
  display: grid;
  gap: 1rem;
}

.page-faq .faq-help__tag {
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.page-faq .faq-help h2 {
  margin: 0;
  font-size: clamp(1.375rem, 3.2vw, 1.875rem);
  line-height: 1.3;
}

.page-faq .faq-help__lede {
  margin: 0;
  max-width: 42rem;
  color: var(--text-300);
  line-height: 1.8;
}

.page-faq .faq-help__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-faq .faq-help__list li {
  position: relative;
  padding-left: 1.35rem;
  color: var(--text-300);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.page-faq .faq-help__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65rem;
  width: 8px;
  height: 2px;
  background: var(--accent);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.25rem;
}

.page-faq .faq-help__note {
  margin: 0;
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--text-300);
}

/* 桌面端 */
@media (min-width: 60rem) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(190px, 220px) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 4rem);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 5.5rem;
  }

  .page-faq .faq-rail__nav {
    flex-direction: column;
    gap: 0.15rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__link {
    border: 0;
    border-left: 2px solid var(--line-600);
    padding: 0.55rem 0.5rem 0.55rem 0.75rem;
    white-space: normal;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    border-left-color: var(--accent);
    background: var(--ink-800);
  }

  .page-faq .faq-qa__body {
    padding-left: calc(clamp(0.9rem, 2.5vw, 1.35rem) + 1.9rem);
  }

  .page-faq .faq-help__actions {
    gap: 1rem;
  }
}

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

  .page-faq .faq-qa[open] .faq-qa__mark {
    transform: none;
    border-left-color: var(--accent);
    border-top-color: transparent;
  }
}