.page-faq {
  --faq-cut: 22px;
  --faq-rail: 210px;
  overflow-x: clip;
  color: var(--mist);
  padding-bottom: 72px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  display: grid;
  gap: 30px;
  padding-block: 36px 34px;
  isolation: isolate;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -12% -8% auto -32%;
  height: 128%;
  background:
    radial-gradient(58% 52% at 28% 42%, rgba(23, 195, 162, 0.16), transparent 70%),
    radial-gradient(48% 48% at 86% 18%, rgba(91, 75, 224, 0.22), transparent 72%);
  z-index: -1;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: min(420px, 58%);
  height: 4px;
  transform: skewX(-24deg);
  transform-origin: left bottom;
  background: linear-gradient(90deg, var(--teal), rgba(23, 195, 162, 0));
}

.page-faq .faq-hero__eyebrow {
  margin: 18px 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.22em;
  color: var(--teal);
}

.page-faq .faq-hero h1 {
  margin: 0 0 16px;
  font-size: clamp(26px, 5.6vw, 42px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--snow);
  max-width: 18ch;
}

.page-faq .faq-hero__intro {
  margin: 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.85;
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin: 24px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid rgba(92, 104, 132, 0.28);
  font-size: 13px;
}

.page-faq .faq-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-faq .faq-hero__factlabel {
  color: var(--mist);
}

.page-faq .faq-hero__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
}

.page-faq .faq-hero__figure {
  margin: 0;
  position: relative;
  background: var(--panel-deep);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%);
  overflow: hidden;
}

.page-faq .faq-hero__figure::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 42%;
  background: linear-gradient(180deg, rgba(10, 19, 48, 0), rgba(10, 19, 48, 0.85));
  pointer-events: none;
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
}

/* ---------- 正文骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: 28px;
  padding-top: 32px;
}

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

/* ---------- 左侧主题导航 ---------- */
.page-faq .faq-nav {
  min-width: 0;
}

.page-faq .faq-nav__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: var(--rule);
}

.page-faq .faq-nav__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .faq-nav__list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-nav__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 12px;
  font-size: 13.5px;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-nav__link:hover,
.page-faq .faq-nav__link:focus-visible {
  color: var(--snow);
  background: rgba(23, 195, 162, 0.1);
  border-bottom-color: var(--teal);
}

.page-faq .faq-nav__no {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  color: var(--rule);
}

.page-faq .faq-nav__link:hover .faq-nav__no {
  color: var(--teal-soft);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 96px;
}

.page-faq .faq-group + .faq-group {
  margin-top: 56px;
  padding-top: 44px;
  border-top: 1px solid rgba(92, 104, 132, 0.22);
}

.page-faq .faq-group__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: var(--teal);
}

.page-faq .faq-group__head h2 {
  margin: 10px 0 12px;
  font-size: clamp(20px, 3.6vw, 27px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.012em;
  color: var(--snow);
}

.page-faq .faq-group__head::after {
  content: "";
  display: block;
  width: 86px;
  height: 4px;
  margin-top: 16px;
  transform: skewX(-24deg);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--teal), rgba(23, 195, 162, 0));
}

.page-faq .faq-group__lead {
  margin: 14px 0 22px;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-group__items {
  border-top: 1px solid rgba(92, 104, 132, 0.22);
}

/* ---------- 单条问答 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid rgba(92, 104, 132, 0.22);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 4px 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--snow);
  transition: color 0.2s var(--ease);
}

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

.page-faq .faq-item__q:hover {
  color: var(--teal-soft);
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.page-faq .faq-item__q::after {
  content: "+";
  flex: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 800;
  line-height: 1;
  color: var(--teal);
  transition: color 0.24s var(--ease);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "–";
  color: var(--ember);
}

.page-faq .faq-item__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--rule);
  transition: color 0.24s var(--ease);
}

.page-faq .faq-item[open] .faq-item__no {
  color: var(--ember);
}

.page-faq .faq-item__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-item__a {
  margin: 0 0 18px 12px;
  padding: 2px 0 2px 20px;
  border-left: 2px solid rgba(23, 195, 162, 0.32);
  font-size: 14.6px;
  line-height: 1.85;
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
  max-width: 66ch;
}

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

.page-faq .faq-item__a a {
  color: var(--teal-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

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

.page-faq .num {
  font-family: var(--font-mono);
  font-weight: 800;
  color: var(--ember);
  letter-spacing: 0.01em;
}

/* ---------- 周期模块配图与刻度图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 26px;
  position: relative;
  background: var(--panel-deep);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  padding: 12px 16px 16px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px solid rgba(92, 104, 132, 0.24);
}

.page-faq .faq-span {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  margin: 14px 0 4px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-faq {
    padding-bottom: 104px;
  }

  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 48px;
    padding-block: 62px 56px;
  }

  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding-top: 48px;
  }

  .page-faq .faq-nav {
    position: sticky;
    top: 92px;
  }

  .page-faq .faq-nav__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-nav__link {
    border-bottom: 0;
    border-left: 2px solid transparent;
    padding: 10px 12px;
    white-space: normal;
  }

  .page-faq .faq-nav__link:hover,
  .page-faq .faq-nav__link:focus-visible {
    border-bottom-color: transparent;
    border-left-color: var(--teal);
  }

  .page-faq .faq-item__a {
    margin-left: 18px;
    padding-left: 26px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-hero h1 {
    max-width: 16ch;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-nav__link,
  .page-faq .faq-item__q,
  .page-faq .faq-item__q::after,
  .page-faq .faq-item__no {
    transition: none;
  }
}