.page-faq {
  --faq-indent: clamp(0px, 7vw, 132px);
  background: var(--ink);
  color: var(--white);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--night);
  padding: clamp(30px, 6vw, 78px) 0 clamp(24px, 4vw, 52px);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: 8%;
  right: -16%;
  width: clamp(140px, 26vw, 300px);
  aspect-ratio: 1 / 1;
  background: var(--red);
  opacity: .15;
  border-radius: 46% 54% 58% 42% / 52% 44% 56% 48%;
  pointer-events: none;
}

.page-faq .faq-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-faq .breadcrumb {
  margin: 0 0 clamp(18px, 3vw, 30px);
  font-size: 13px;
  color: var(--mist);
}

.page-faq .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--white);
}

.page-faq .faq-title {
  margin: 8px 0 18px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 7.2vw, 66px);
  line-height: 1.07;
  letter-spacing: -.02em;
  color: var(--board);
}

.page-faq .faq-lede {
  margin: 0 0 clamp(22px, 3.6vw, 36px);
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: rgba(233, 238, 247, .74);
}

/* ---------- 分组快速跳转 ---------- */

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-jump li:nth-child(1) { --accent: var(--red); }
.page-faq .faq-jump li:nth-child(2) { --accent: var(--blue); }
.page-faq .faq-jump li:nth-child(3) { --accent: var(--green); }
.page-faq .faq-jump li:nth-child(4) { --accent: var(--yellow); }
.page-faq .faq-jump li:nth-child(5) { --accent: var(--white); }

.page-faq .faq-jump a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent, var(--red));
  border-radius: 999px;
  background: rgba(27, 44, 72, .55);
  color: var(--white);
  font-size: 13.5px;
  line-height: 1.2;
  text-decoration: none;
  transition: background .2s var(--ease), border-color .2s var(--ease);
}

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  background: var(--panel);
}

.page-faq .faq-jump-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent, var(--red));
  letter-spacing: .04em;
}

/* ---------- 问答主体 ---------- */

.page-faq .faq-body {
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-faq .faq-body > .faq-group:nth-of-type(1) { --accent: var(--red); }
.page-faq .faq-body > .faq-group:nth-of-type(2) { --accent: var(--blue); }
.page-faq .faq-body > .faq-group:nth-of-type(3) { --accent: var(--green); }
.page-faq .faq-body > .faq-group:nth-of-type(4) { --accent: var(--yellow); }
.page-faq .faq-body > .faq-group:nth-of-type(5) { --accent: var(--white); }

.page-faq .faq-group {
  position: relative;
  padding: clamp(30px, 5vw, 56px) 0 clamp(26px, 4vw, 46px);
}

.page-faq .faq-group::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 58px;
  height: 5px;
  border-radius: 3px;
  background: var(--accent, var(--red));
}

.page-faq .faq-group-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-size: clamp(13px, 1.5vw, 17px);
  letter-spacing: .06em;
  color: var(--accent, var(--red));
}

.page-faq .faq-group-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 4.2vw, 42px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--board);
}

/* ---------- 配图 ---------- */

.page-faq .faq-figure {
  margin: 0 0 clamp(20px, 3.4vw, 34px);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}

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

.page-faq .faq-figure--wide img { aspect-ratio: 2 / 1; }
.page-faq .faq-figure--side img { aspect-ratio: 4 / 3; }

/* ---------- 问答条目 ---------- */

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

.page-faq .faq-item {
  border-top: 1px solid var(--line);
  border-radius: 18px;
  transition: background .24s var(--ease);
}

.page-faq .faq-item[open] {
  background: var(--panel);
  border-top-color: transparent;
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: clamp(16px, 2.6vw, 24px) clamp(8px, 1.8vw, 20px);
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item summary:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 3px;
  border-radius: 14px;
}

.page-faq .faq-item summary::after {
  content: "+";
  flex: 0 0 auto;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.4vw, 24px);
  line-height: 1;
  color: var(--accent, var(--red));
  transition: transform .22s var(--ease);
}

.page-faq .faq-item[open] summary::after {
  content: "−";
  transform: translateY(-1px);
}

.page-faq .faq-q {
  flex: 1 1 auto;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(18px, 3vw, 29px);
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-faq .faq-a {
  padding: 0 clamp(8px, 1.8vw, 20px) clamp(16px, 2.6vw, 26px);
}

.page-faq .faq-a p {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.78;
  color: rgba(233, 238, 247, .76);
}

.page-faq .faq-a a {
  color: var(--board);
  text-decoration: underline;
  text-decoration-color: var(--accent, var(--red));
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-faq .faq-a a:hover,
.page-faq .faq-a a:focus-visible {
  color: var(--red);
}

/* ---------- 桌面端错位 ---------- */

@media (min-width: 900px) {
  .page-faq .faq-group-head {
    gap: 6px 22px;
  }

  .page-faq .faq-a {
    padding-left: var(--faq-indent);
    padding-right: clamp(20px, 4vw, 60px);
  }

  .page-faq .faq-figure--side {
    width: min(520px, 60%);
    margin-left: auto;
    margin-right: 0;
  }

  .page-faq .faq-body > .faq-group:nth-of-type(even) {
    margin-left: clamp(0px, 4vw, 64px);
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-item summary {
    padding-right: clamp(24px, 3vw, 40px);
  }
}