.page-faq {
  --faq-cut: 14px;
  --faq-pad: clamp(16px, 3vw, 28px);
  position: relative;
  color: var(--text);
  font-family: var(--font-body);
  background-color: var(--carbon);
  background-image:
    linear-gradient(var(--line-faint) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-faint) 1px, transparent 1px);
  background-size: 48px 48px;
  overflow-x: hidden;
}

/* 面包屑 */
.page-faq .faq-crumbs {
  padding: 20px var(--gutter) 0;
}
.page-faq .faq-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--index);
}
.page-faq .faq-crumbs li + li::before {
  content: "／";
  margin-right: 8px;
  color: var(--green-line);
}
.page-faq .faq-crumbs a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color .2s ease;
}
.page-faq .faq-crumbs a:hover {
  color: var(--cyan);
}

/* 首屏 */
.page-faq .faq-hero {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(26px, 5vw, 52px) var(--gutter) clamp(30px, 5vw, 58px);
  border-bottom: 1px solid var(--line-soft);
}
.page-faq .faq-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--index);
}
.page-faq .faq-hero__no {
  padding: 3px 8px;
  color: var(--carbon);
  background: var(--amber);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}
.page-faq .faq-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(48px, 11vw, 116px);
  line-height: .92;
  letter-spacing: -.02em;
  font-weight: 700;
  color: var(--cyan-soft);
}
.page-faq .faq-hero__text {
  max-width: 62ch;
  margin: 0;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* 轮次刻度带 */
.page-faq .faq-scale {
  position: relative;
  max-width: 520px;
  height: 30px;
  margin-top: 26px;
  border-bottom: 1px solid var(--line-faint);
  background-image: repeating-linear-gradient(90deg, var(--line-soft) 0 1px, transparent 1px 17px);
}
.page-faq .faq-scale__fill {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 96%;
  height: 3px;
  background: linear-gradient(90deg, var(--green-line), var(--cyan));
}
.page-faq .faq-scale__mark {
  position: absolute;
  right: 0;
  bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--amber);
}

.page-faq .faq-hero__fig {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--green-deep);
  border: 1px solid var(--line-soft);
  clip-path: polygon(var(--faq-cut) 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%, 0 var(--faq-cut));
}
.page-faq .faq-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.92) contrast(1.05);
}

/* 主体两栏 */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 36px);
  padding: clamp(28px, 5vw, 56px) var(--gutter);
}

.page-faq .faq-side__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--index);
}
.page-faq .faq-side__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
}
.page-faq .faq-side__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 13px 9px 14px;
  border-left: 1px solid var(--line-faint);
  color: var(--text-dim);
  font-size: 14px;
  white-space: nowrap;
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}
.page-faq .faq-side__link:hover,
.page-faq .faq-side__link:focus-visible {
  color: var(--cyan-soft);
  border-left-color: var(--cyan);
  background: var(--cyan-wash);
}
.page-faq .faq-side__no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--green-line);
}

/* 折叠问答组 */
.page-faq .faq-group {
  position: relative;
  margin-bottom: clamp(14px, 2vw, 20px);
  background: var(--panel);
  border: 1px solid var(--line-faint);
  scroll-margin-top: 84px;
  clip-path: polygon(var(--faq-cut) 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%, 0 var(--faq-cut));
  transition: border-color .24s ease;
}
.page-faq .faq-group:hover {
  border-color: var(--line-soft);
}
.page-faq .faq-group::before {
  content: "";
  position: absolute;
  left: 0;
  top: var(--faq-cut);
  bottom: 0;
  width: 1px;
  background: var(--line-soft);
  transition: width .24s ease, background-color .24s ease;
}
.page-faq .faq-group[data-open]::before {
  width: 3px;
  background: var(--cyan);
}

.page-faq .faq-group__head {
  margin: 0;
}
.page-faq .faq-group__trigger {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px var(--faq-pad);
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.page-faq .faq-group__trigger:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}
.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--amber);
}
.page-faq .faq-group__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 26px);
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-faq .faq-group__hint {
  display: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--index);
}
.page-faq .faq-group__mark {
  width: 11px;
  height: 11px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform .24s ease;
}
.page-faq .faq-group[data-open] .faq-group__mark {
  transform: rotate(225deg);
}

.page-faq .faq-group__panel {
  padding: 0 var(--faq-pad) clamp(12px, 2vw, 18px);
}
.page-faq .faq-group__panel[hidden] {
  display: none;
}

/* 问答条目 */
.page-faq .qa {
  padding: 18px 0;
}
.page-faq .qa + .qa {
  border-top: 1px dashed var(--line-faint);
}
.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 9px;
  font-size: clamp(16px, 1.7vw, 20px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--cyan-soft);
}
.page-faq .qa__idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--index);
}
.page-faq .qa__a {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-dim);
}
.page-faq .qa__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
  transition: border-color .2s ease, color .2s ease;
}
.page-faq .qa__a a:hover {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan);
}

/* 分组内配图 */
.page-faq .faq-figure {
  margin: 4px 0 18px;
  overflow: hidden;
  background: var(--green-deep);
  border: 1px solid var(--line-faint);
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line-faint);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .03em;
  color: var(--index);
}

/* 底部索引条 */
.page-faq .faq-indexbar {
  padding: clamp(24px, 4vw, 40px) var(--gutter) clamp(40px, 6vw, 64px);
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(15, 59, 46, .38), rgba(11, 15, 14, 0));
}
.page-faq .faq-indexbar__label {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--index);
}
.page-faq .faq-indexbar__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-faq .faq-indexbar__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid var(--line-faint);
  color: var(--text-dim);
  font-size: 13px;
  text-decoration: none;
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  transition: color .2s ease, background-color .2s ease, border-color .2s ease;
}
.page-faq .faq-indexbar__link:hover,
.page-faq .faq-indexbar__link:focus-visible {
  color: var(--carbon);
  background: var(--cyan);
  border-color: var(--cyan);
}
.page-faq .faq-indexbar__no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber);
}
.page-faq .faq-indexbar__link:hover .faq-indexbar__no {
  color: var(--green-deep);
}

/* 桌面端布局 */
@media (min-width: 720px) {
  .page-faq .faq-group__hint {
    display: block;
  }
  .page-faq .qa__a {
    margin-left: 30px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.3fr) minmax(280px, .8fr);
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: 224px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
    align-items: start;
  }
  .page-faq .faq-side {
    position: sticky;
    top: 84px;
  }
  .page-faq .faq-side__list {
    display: block;
    overflow: visible;
    padding: 0;
  }
  .page-faq .faq-side__link {
    padding: 10px 12px 10px 14px;
  }
  .page-faq .faq-side__list li + li {
    margin-top: 4px;
  }
}