.page-faq {
  --faq-sec: clamp(46px, 8vw, 96px);
  --faq-gap: clamp(22px, 4vw, 44px);
  --faq-line: var(--line);
  display: block;
  background: var(--ink);
}

.page-faq .surface-paper,
.page-faq .surface-paper-2 {
  --faq-line: var(--line-ink);
}

.page-faq .surface-ink,
.page-faq .surface-ink-2 {
  --faq-line: var(--line);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  --fg: var(--paper);
  --fg-muted: var(--muted);
  position: relative;
  padding: clamp(20px, 4vw, 36px) 0 clamp(32px, 6vw, 62px);
  background:
    radial-gradient(120% 90% at 78% 0%, rgba(200, 255, 61, 0.08), transparent 62%),
    var(--ink);
  overflow: hidden;
}

.page-faq .faq-hero__frame {
  position: relative;
  margin-top: clamp(18px, 3vw, 28px);
  padding: clamp(22px, 4vw, 40px) clamp(18px, 3.4vw, 38px);
  border: 1px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(244, 241, 230, 0.055), rgba(244, 241, 230, 0));
}

.page-faq .faq-hero__frame::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 12%;
  width: 3px;
  height: 34%;
  background: var(--lime);
}

.page-faq .faq-hero__lede {
  margin: clamp(14px, 2.4vw, 22px) 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.85;
  color: var(--fg-muted);
}

/* ---------- 问题索引 ---------- */
.page-faq .faq-index {
  margin-top: clamp(26px, 4.5vw, 46px);
  padding-top: clamp(16px, 2.6vw, 24px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-index__title {
  margin: 0 0 clamp(12px, 2vw, 18px);
  font: 600 12px/1 var(--font-mono);
  letter-spacing: 0.2em;
  color: var(--lime);
}

.page-faq .faq-index__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: fx;
}

@media (min-width: 680px) {
  .page-faq .faq-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(18px, 3vw, 44px);
  }
}

.page-faq .faq-index__list li {
  counter-increment: fx;
}

.page-faq .faq-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 2px;
  border-bottom: 1px dashed var(--line);
  font: 500 13px/1.55 var(--font-mono);
  color: var(--paper);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-index__list a::before {
  content: counter(fx, decimal-leading-zero);
  flex: 0 0 auto;
  font-weight: 700;
  color: var(--brick);
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
  outline: none;
}

.page-faq .faq-index__list a:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-faq .faq-index__list a.is-active {
  color: var(--lime-soft);
  border-bottom-color: var(--line-strong);
}

.page-faq .faq-index__list a.is-active::before {
  color: var(--lime);
}

/* ---------- 首屏下方氛围图 ---------- */
.page-faq .faq-banner {
  margin: 0;
  background: var(--ink);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.05);
}

/* ---------- 分组通用 ---------- */
.page-faq .faq-group {
  padding: var(--faq-sec) 0;
  position: relative;
}

.page-faq .faq-group__head {
  display: grid;
  gap: clamp(8px, 1.4vw, 14px);
  margin-bottom: clamp(24px, 3.8vw, 40px);
  max-width: 68ch;
}

.page-faq .faq-group__no {
  font: 800 clamp(30px, 5vw, 46px)/1 var(--font-mono);
  letter-spacing: -0.03em;
  color: var(--brick);
}

.page-faq .faq-tick {
  display: block;
  width: 64px;
  height: 4px;
  background-image: repeating-linear-gradient(90deg, var(--lime) 0 4px, transparent 4px 11px);
}

.page-faq .faq-group__note {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--fg-muted);
}

.page-faq .faq-group__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
}

@media (min-width: 920px) {
  .page-faq .faq-group__body {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-list {
  border-top: 1px solid var(--faq-line);
  min-width: 0;
}

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

.page-faq .qa > summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: clamp(14px, 2.2vw, 20px) 0;
  cursor: pointer;
  list-style: none;
  font-size: clamp(16px, 1.8vw, 17px);
  font-weight: 700;
  line-height: 1.55;
  color: var(--fg);
  transition: color 0.2s var(--ease);
}

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

.page-faq .qa > summary::marker {
  content: "";
}

.page-faq .qa > summary::after {
  content: "";
  flex: 0 0 auto;
  width: 11px;
  height: 11px;
  margin-top: 5px;
  border-right: 2px solid var(--lime);
  border-bottom: 2px solid var(--lime);
  transform: rotate(45deg);
  transition: transform 0.24s var(--ease);
}

.page-faq .qa[open] > summary::after {
  transform: rotate(-135deg);
  margin-top: 9px;
}

.page-faq .qa > summary:hover {
  text-decoration: underline;
  text-decoration-color: var(--lime);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.page-faq .qa > summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-faq .qa__body {
  padding: 0 0 clamp(16px, 2.6vw, 24px);
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--fg);
  opacity: 0.86;
}

.page-faq .qa__body p {
  margin: 0 0 0.85em;
}

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

/* ---------- 侧栏卡片 ---------- */
.page-faq .faq-side {
  display: grid;
  gap: clamp(12px, 2vw, 18px);
  align-content: start;
  min-width: 0;
}

.page-faq .faq-card {
  display: grid;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-faq .surface-paper .faq-card,
.page-faq .surface-paper-2 .faq-card {
  background: var(--paper-2);
}

.page-faq .faq-card:hover,
.page-faq .faq-card:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--lime);
  border-color: var(--lime);
}

.page-faq .faq-card:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-faq .faq-card__label {
  font: 700 11px/1 var(--font-mono);
  letter-spacing: 0.16em;
  color: var(--brick);
}

.page-faq .faq-card__title {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-card__desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(22, 33, 29, 0.7);
}

/* ---------- 纠错邮箱块 ---------- */
.page-faq .faq-contact {
  display: grid;
  gap: 10px;
  justify-items: start;
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--paper);
  border: 1px solid var(--ink);
  border-left: 4px solid var(--brick);
  border-radius: var(--radius);
}

.page-faq .faq-contact__label {
  margin: 0;
  font: 700 11px/1 var(--font-mono);
  letter-spacing: 0.16em;
  color: var(--brick);
}

.page-faq .faq-contact__mail {
  margin: 0;
  font: 600 15px/1.5 var(--font-mono);
  color: var(--text);
  word-break: break-all;
}

/* ---------- 辅助图 ---------- */
.page-faq .faq-figure {
  margin: clamp(22px, 3.6vw, 34px) 0 0;
  border: 1px solid var(--line-ink);
  background: var(--paper-2);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.05);
}

.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line-ink);
  font-size: 12px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 深色分组内的细节 ---------- */
.page-faq .surface-ink .faq-figure,
.page-faq .surface-ink-2 .faq-figure {
  border-color: var(--line);
  background: var(--ink-2);
}

.page-faq .surface-ink .faq-figure figcaption,
.page-faq .surface-ink-2 .faq-figure figcaption {
  border-top-color: var(--line);
  color: var(--muted);
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-card,
  .page-faq .qa > summary,
  .page-faq .qa > summary::after,
  .page-faq .faq-index__list a {
    transition: none !important;
  }
  .page-faq .faq-card:hover,
  .page-faq .faq-card:focus-visible {
    transform: none;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 480px) {
  .page-faq .faq-hero__frame {
    padding: 18px 16px;
  }
  .page-faq .faq-index__list a {
    font-size: 12.5px;
  }
  .page-faq .qa > summary {
    gap: 10px;
  }
  .page-faq .faq-contact__mail {
    font-size: 13.5px;
  }
}