.page-faq {
  --faq-rail-w: 248px;
  background-color: var(--abyss);
  color: var(--score-white);
  max-width: 100%;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 36px) 0 44px;
  border-bottom: 1px solid var(--line-dim);
  background:
    radial-gradient(760px 380px at 14% -20%, rgba(53, 240, 208, 0.16), transparent 68%),
    radial-gradient(620px 340px at 92% 118%, rgba(19, 160, 140, 0.16), transparent 70%),
    var(--abyss);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -10%;
  right: -70px;
  width: 200px;
  height: 120%;
  background: repeating-linear-gradient(
    to bottom,
    rgba(53, 240, 208, 0.22) 0 1px,
    transparent 1px 14px
  );
  transform: skewX(-12deg);
  pointer-events: none;
}

.page-faq .faq-crumbs {
  position: relative;
  z-index: 1;
  margin-bottom: 26px;
}

.page-faq .faq-crumbs .breadcrumbs {
  margin: 0;
}

.page-faq .faq-eyebrow {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon-cyan);
}

.page-faq .faq-eyebrow::before {
  content: "";
  width: 30px;
  height: 2px;
  background: var(--neon-cyan);
}

.page-faq .faq-title {
  position: relative;
  z-index: 1;
  max-width: 22ch;
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(29px, 6.6vw, 54px);
  line-height: 1.1;
  letter-spacing: 0.015em;
}

.page-faq .faq-lede {
  position: relative;
  z-index: 1;
  max-width: 68ch;
  margin: 20px 0 0;
  font-size: 17px;
  line-height: 1.78;
  color: var(--steel-mist);
}

@media (min-width: 680px) {
  .page-faq .faq-lede {
    font-size: 18px;
  }
}

/* ---------- 目录 + 正文 布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 40px 0 72px;
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 56px;
    padding: 64px 0 104px;
  }
}

.page-faq .faq-rail {
  margin-bottom: 28px;
  padding-left: 16px;
  border-left: 1px solid var(--line-dim);
}

@media (min-width: 960px) {
  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
    margin-bottom: 0;
    padding-left: 20px;
  }
}

.page-faq .faq-rail-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel-mist);
}

.page-faq .faq-rail-list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail-link {
  display: block;
  padding: 8px 0 8px 12px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.5;
  color: var(--steel-mist);
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-faq .faq-rail-link:hover,
.page-faq .faq-rail-link:focus-visible {
  color: var(--score-white);
  border-left-color: var(--cyan-deep);
}

.page-faq .faq-rail-link.is-active,
.page-faq .faq-rail-link[aria-current="true"] {
  color: var(--neon-cyan);
  border-left-color: var(--neon-cyan);
}

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

/* ---------- 主题分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 20px);
  padding: 30px 0 14px;
  border-top: 1px solid var(--line-dim);
}

.page-faq .faq-group:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .faq-group-head {
  margin-bottom: 10px;
}

.page-faq .faq-group-no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--neon-cyan);
}

.page-faq .faq-group-title {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 4.4vw, 34px);
  line-height: 1.15;
  letter-spacing: 0.02em;
}

.page-faq .faq-group-note {
  max-width: 60ch;
  margin: 0 0 6px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--steel-mist);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--line-dim);
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 0;
  list-style: none;
  cursor: pointer;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.55;
  color: var(--score-white);
  transition: color 160ms var(--ease);
}

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

.page-faq .faq-item > summary::after {
  content: "+";
  flex: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.35;
  color: var(--neon-cyan);
}

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

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

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

.page-faq .faq-answer {
  margin: 0 0 18px;
  padding: 16px 18px;
  border-left: 2px solid var(--neon-cyan);
  background: var(--grid-slate);
  animation: faq-reveal 280ms var(--ease);
}

.page-faq .faq-answer p {
  max-width: 68ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--score-white);
}

.page-faq .faq-answer p + p {
  margin-top: 12px;
}

.page-faq .faq-answer strong {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--signal-orange);
}

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

@keyframes faq-reveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 版本节奏 ---------- */
.page-faq .faq-versions {
  display: grid;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-version {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line-dim);
  background: var(--sea-slab);
}

.page-faq .faq-version:first-child {
  border-top: 1px solid var(--line-dim);
}

.page-faq .faq-version-tag {
  flex: none;
  min-width: 72px;
  font-family: var(--font-mono);
  font-size: 18px;
  letter-spacing: 0.08em;
  color: var(--score-white);
}

.page-faq .faq-version-label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--steel-mist);
}

.page-faq .faq-version.is-current {
  background: var(--grid-slate);
  border-left: 3px solid var(--signal-orange);
}

.page-faq .faq-version.is-current .faq-version-tag {
  color: var(--signal-orange);
  font-weight: 700;
}

/* ---------- 三步查找 ---------- */
.page-faq .faq-steps {
  display: grid;
  gap: 0;
  margin: 20px 0 6px;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line-dim);
}

.page-faq .faq-step {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  border-bottom: 1px solid var(--line-dim);
  background: var(--sea-slab);
}

.page-faq .faq-step:last-child {
  border-bottom: 0;
}

.page-faq .faq-step-no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--neon-cyan);
}

.page-faq .faq-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--score-white);
}

@media (min-width: 760px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-step {
    flex-direction: column;
    gap: 10px;
    border-bottom: 0;
    border-right: 1px solid var(--line-dim);
    border-top: 3px solid var(--neon-cyan);
  }

  .page-faq .faq-step:last-child {
    border-right: 0;
  }
}

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

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

.page-faq .faq-figure .frame-caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--steel-mist);
}

/* ---------- 联系路径 ---------- */
.page-faq .faq-contact-list {
  display: grid;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-contact-row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-dim);
}

.page-faq .faq-contact-row:first-child {
  border-top: 1px solid var(--line-dim);
}

.page-faq .faq-contact-key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--neon-cyan);
}

.page-faq .faq-contact-text {
  max-width: 62ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--score-white);
}

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

@media (min-width: 720px) {
  .page-faq .faq-contact-row {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

/* ---------- 返回顶部 ---------- */
.page-faq .top-btn {
  position: fixed;
  right: 18px;
  bottom: 22px;
  z-index: 40;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line-dim);
  background: var(--grid-slate);
  color: var(--neon-cyan);
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 240ms var(--ease), transform 240ms var(--ease), visibility 240ms var(--ease);
}

.page-faq .top-btn[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.page-faq .top-btn:hover,
.page-faq .top-btn:focus-visible {
  border-color: var(--neon-cyan);
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-answer {
    animation: none;
  }

  .page-faq .faq-rail-link,
  .page-faq .faq-item > summary,
  .page-faq .top-btn {
    transition: none;
  }
}