.page-faq {
  --faq-rail: 264px;
  --faq-sticky: 92px;
}

.page-faq .breadcrumb {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(36px, 7vw, 84px) 0 clamp(32px, 5vw, 60px);
  border-bottom: 1px solid var(--grid);
  background:
    radial-gradient(130% 120% at 8% 0%, var(--signal-12), transparent 58%),
    linear-gradient(180deg, var(--panel), var(--ink));
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -60% auto;
  width: 520px;
  height: 340px;
  background: repeating-linear-gradient(
    115deg,
    var(--signal-06) 0 1px,
    transparent 1px 14px
  );
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-faq .faq-hero h1 {
  margin: 10px 0 0;
  font-family: var(--font-condensed);
  font-size: clamp(30px, 6.4vw, 54px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--white);
  max-width: 18em;
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-hero__quick {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--grid);
}

.page-faq .faq-hero__quick-item {
  border-bottom: 1px solid var(--grid);
}

.page-faq .faq-hero__quick-item a {
  display: block;
  padding: 13px 2px 13px 26px;
  position: relative;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-faq .faq-hero__quick-item a::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 50%;
  width: 12px;
  height: 1px;
  background: var(--signal);
  transform: translateY(-50%);
}

.page-faq .faq-hero__quick-item a:hover {
  color: var(--white);
  padding-left: 34px;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  padding-top: clamp(32px, 5vw, 64px);
  padding-bottom: clamp(56px, 8vw, 96px);
}

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

.page-faq .faq-toc__label,
.page-faq .faq-legend__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 8px;
}

.page-faq .faq-toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 8px 9px 10px;
  border-left: 2px solid var(--grid);
  font-size: 13.5px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .faq-toc__link:hover {
  color: var(--white);
  border-left-color: var(--signal);
  background: var(--signal-06);
}

.page-faq .faq-toc__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--signal);
}

.page-faq .faq-legend {
  margin-top: 28px;
  padding: 16px 16px 18px;
  border: 1px solid var(--grid);
  background: linear-gradient(150deg, var(--signal-06), transparent 70%), var(--panel);
}

.page-faq .faq-legend__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-legend__item {
  display: grid;
  grid-template-columns: 14px 1fr auto;
  align-items: center;
  gap: 10px;
  font-size: 13px;
}

.page-faq .faq-legend__swatch {
  width: 14px;
  height: 14px;
  display: block;
}

.page-faq .faq-legend__swatch--corner {
  background: var(--signal);
  box-shadow: 0 0 0 1px var(--signal-35);
}

.page-faq .faq-legend__swatch--offside {
  background: var(--amber);
  box-shadow: 0 0 0 1px var(--amber-40);
}

.page-faq .faq-legend__swatch--alert {
  background: var(--coral);
}

.page-faq .faq-legend__name {
  color: var(--white);
}

.page-faq .faq-legend__val {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
}

/* ---------- 右侧问答流 ---------- */
.page-faq .faq-flow {
  min-width: 0;
}

.page-faq .faq-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--grid);
}

.page-faq .faq-filter {
  font: inherit;
  font-size: 13px;
  padding: 7px 14px;
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .faq-filter:hover {
  color: var(--white);
  border-color: var(--signal-35);
}

.page-faq .faq-filter.is-active {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
  font-weight: 600;
}

.page-faq .faq-group {
  margin-bottom: clamp(40px, 6vw, 72px);
  scroll-margin-top: var(--faq-sticky);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--grid);
}

.page-faq .faq-group__index {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  color: var(--signal);
  letter-spacing: -0.02em;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-condensed);
  font-size: clamp(19px, 2.6vw, 24px);
  letter-spacing: 0.01em;
  color: var(--white);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  border: 1px solid var(--grid);
  border-left-width: 2px;
  border-top: none;
  background: linear-gradient(180deg, var(--panel), rgba(16, 43, 36, 0.5));
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-faq .qa:hover {
  border-color: var(--signal-35);
}

.page-faq .qa[open] {
  border-left-color: var(--signal);
  background: linear-gradient(180deg, var(--panel), var(--ink));
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--white);
}

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

.page-faq .qa__q::after {
  content: "";
  flex: none;
  align-self: center;
  margin-left: auto;
  width: 8px;
  height: 8px;
  border-right: 1.5px solid var(--signal);
  border-bottom: 1.5px solid var(--signal);
  transform: rotate(45deg);
  transition: transform 0.22s var(--ease);
}

.page-faq .qa[open] .qa__q::after {
  transform: rotate(-135deg);
}

.page-faq .qa__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--signal);
  padding-top: 2px;
}

.page-faq .qa__a {
  padding: 0 16px 18px 42px;
  border-top: 1px dashed var(--grid);
  margin-top: 2px;
  padding-top: 14px;
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .qa__a a {
  color: var(--mist);
  text-decoration: underline;
  text-decoration-color: var(--signal-35);
  text-underline-offset: 3px;
}

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

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 22px;
  border: 1px solid var(--grid);
  background: var(--panel);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-bottom: 1px solid var(--grid);
}

.page-faq .faq-figure__cap {
  padding: 11px 14px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  font-family: var(--font-mono);
}

/* ---------- 底部引导 ---------- */
.page-faq .faq-outro {
  display: grid;
  gap: 22px;
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--amber-40);
  background:
    linear-gradient(135deg, var(--amber-18), transparent 62%),
    var(--panel);
}

.page-faq .faq-outro__eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-faq .faq-outro__text {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--white);
}

.page-faq .faq-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(240px, 1fr);
    align-items: start;
  }

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

  .page-faq .qa__q {
    padding: 17px 20px;
  }

  .page-faq .qa__a {
    padding: 14px 20px 20px 48px;
  }

  .page-faq .faq-outro {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

/* ---------- 桌面两栏 ---------- */
@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    align-items: start;
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__q::after,
  .page-faq .qa,
  .page-faq .faq-toc__link,
  .page-faq .faq-filter,
  .page-faq .faq-hero__quick-item a {
    transition: none;
  }
}