.page-faq {
  --faq-rail: 258px;
  --faq-accent: var(--cyan);
  padding-bottom: 96px;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 26px 0 42px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: -25% -12% -45% 38%;
  background-image:
    linear-gradient(112deg, transparent 49.4%, var(--line) 49.4%, var(--line) 50%, transparent 50%),
    linear-gradient(112deg, transparent 74.4%, var(--line) 74.4%, var(--line) 75%, transparent 75%),
    radial-gradient(58% 68% at 78% 22%, rgba(43, 232, 198, 0.12), transparent 72%);
  opacity: 0.85;
  pointer-events: none;
}

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

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  max-width: 17ch;
  font-family: var(--font-sans);
  font-size: clamp(30px, 7.4vw, 54px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-faq .faq-hero .lede {
  margin: 18px 0 0;
  max-width: 58ch;
  color: var(--slate);
  font-size: 16px;
  line-height: 1.75;
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  padding-top: 34px;
}

/* ---------- 左栏目录 ---------- */
.page-faq .faq-rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-dim);
}

.page-faq .faq-toc {
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-toc li + li {
  border-top: 1px solid var(--line);
}

.page-faq .faq-toc a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 4px;
  color: var(--mist);
  font-size: 15px;
  text-decoration: none;
  transition: color 0.18s ease, padding-left 0.18s ease;
}

.page-faq .faq-toc a:hover {
  color: var(--cyan);
  padding-left: 9px;
}

.page-faq .faq-toc a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 8px;
}

.page-faq .faq-cnt {
  margin-left: auto;
  font-size: 12px;
  color: var(--slate);
}

.page-faq .faq-dot {
  display: inline-block;
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-faq .faq-dot--cyan { background: var(--cyan); }
.page-faq .faq-dot--orange { background: var(--orange); }
.page-faq .faq-dot--signal { background: var(--signal); }

.page-faq .faq-filter {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-filter label {
  display: block;
  margin-bottom: 9px;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--slate);
}

.page-faq .faq-filter input {
  box-sizing: border-box;
  width: 100%;
  padding: 11px 16px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: rgba(13, 42, 66, 0.72);
  color: var(--mist);
  font-family: var(--font-sans);
  font-size: 14px;
}

.page-faq .faq-filter input::placeholder {
  color: #6c86a0;
}

.page-faq .faq-filter input:focus {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 108px;
}

.page-faq .faq-group + .faq-group {
  margin-top: 58px;
}

.page-faq .faq-group--cyan { --faq-accent: var(--cyan); }
.page-faq .faq-group--orange { --faq-accent: var(--orange); }
.page-faq .faq-group--signal { --faq-accent: var(--signal); }

.page-faq .faq-group-head {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 0 12px 15px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group-head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  bottom: 15px;
  width: 3px;
  border-radius: 3px;
  background: var(--faq-accent);
}

.page-faq .faq-group-head .faq-dot {
  background: var(--faq-accent);
}

.page-faq .faq-group-head h2 {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(20px, 4.4vw, 26px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-faq .faq-group-note {
  margin: 13px 0 0;
  color: var(--slate);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: 22px 0 6px;
  max-width: 100%;
}

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

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--faq-accent);
  color: var(--slate);
  font-size: 12.5px;
  line-height: 1.6;
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-items {
  margin-top: 6px;
}

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

.page-faq .faq-item summary {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 6px;
  color: var(--mist);
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.6;
  list-style: none;
  cursor: pointer;
  transition: color 0.18s ease;
}

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

.page-faq .faq-item summary:hover {
  color: var(--cyan);
}

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
  border-radius: 8px;
}

.page-faq .faq-item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 500;
  line-height: 1;
  color: var(--faq-accent);
}

.page-faq .faq-item[open] summary::after {
  content: "\2212";
}

.page-faq .faq-num {
  flex: 0 0 34px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--faq-accent);
}

.page-faq .faq-a {
  padding: 0 6px 22px 54px;
  color: var(--slate);
  font-size: 14.5px;
  line-height: 1.8;
}

.page-faq .faq-a p {
  margin: 0;
}

.page-faq .faq-a a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 结尾导流 ---------- */
.page-faq .faq-outro {
  margin: 48px 0 0;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius);
  background: rgba(13, 42, 66, 0.55);
  color: var(--slate);
  font-size: 14.5px;
  line-height: 1.8;
}

.page-faq .faq-outro a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 返回顶部 ---------- */
.page-faq .faq-top {
  position: fixed;
  right: 16px;
  bottom: 96px;
  z-index: 30;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: rgba(13, 42, 66, 0.92);
  color: var(--cyan);
  font-size: 13px;
  text-decoration: none;
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(10px);
}

.page-faq .faq-top:hover {
  border-color: var(--cyan);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-figure {
    max-width: 380px;
  }

  .page-faq .faq-figure--wide {
    max-width: 100%;
  }

  .page-faq .faq-item summary {
    font-size: 16.5px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: 58px;
    padding-top: 52px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 104px;
  }

  .page-faq .faq-top {
    right: 30px;
    bottom: 34px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-a {
    max-width: 68ch;
  }
}