.page-faq {
  --faq-nav-w: 236px;
  background: var(--ink-900);
  color: var(--mist);
  padding-bottom: 64px;
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumbs {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line-soft);
  background:
    linear-gradient(140deg, rgba(22, 48, 92, .85) 0%, rgba(11, 30, 58, 0) 58%),
    var(--ink-900);
}
.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -90px;
  right: -140px;
  width: 420px;
  height: 420px;
  background: linear-gradient(160deg, rgba(42, 245, 214, .16), rgba(42, 245, 214, 0) 68%);
  clip-path: polygon(42% 0, 100% 0, 100% 100%);
  pointer-events: none;
}
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--orange) 45%, var(--grass) 72%, transparent);
  opacity: .8;
}
.page-faq .faq-hero__inner {
  position: relative;
  padding-top: 46px;
  padding-bottom: 38px;
}
.page-faq .faq-hero h1 {
  margin: 10px 0 18px;
  max-width: 20ch;
}
.page-faq .faq-hero .lede {
  max-width: 58ch;
  margin: 0;
  color: var(--mist);
}
.page-faq .faq-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 24px 0 0;
}
.page-faq .faq-inline-link {
  color: var(--cyan);
  text-decoration: none;
  font-size: 14px;
  border-bottom: 1px solid rgba(42, 245, 214, .45);
  padding-bottom: 2px;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-faq .faq-inline-link:hover,
.page-faq .faq-inline-link:focus-visible {
  color: var(--amber);
  border-color: var(--amber);
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding-top: 30px;
}

/* ---------- 左侧分类时间轴 ---------- */
.page-faq .faq-nav {
  align-self: start;
}
.page-faq .faq-nav__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--dim);
}
.page-faq .faq-nav__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.page-faq .faq-nav__list::-webkit-scrollbar {
  display: none;
}
.page-faq .faq-nav__item {
  flex: 0 0 auto;
}
.page-faq .faq-nav__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  color: var(--steel);
  text-decoration: none;
  white-space: nowrap;
  font-size: 14px;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.page-faq .faq-nav__link:hover,
.page-faq .faq-nav__link:focus-visible {
  color: var(--mist);
  border-color: var(--cyan);
  background: var(--cyan-soft);
}
.page-faq .faq-nav__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-faq .faq-block {
  --faq-accent: var(--cyan);
  padding: 30px 0 38px;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 110px;
}
.page-faq .faq-block[data-tone="orange"] { --faq-accent: var(--orange); }
.page-faq .faq-block[data-tone="grass"]  { --faq-accent: var(--grass); }
.page-faq .faq-block[data-tone="amber"]  { --faq-accent: var(--amber); }

.page-faq .faq-block__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 12px;
}
.page-faq .faq-block__num {
  flex: 0 0 auto;
  padding: 3px 7px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  letter-spacing: .08em;
  color: var(--faq-accent);
  border: 1px solid currentColor;
  clip-path: polygon(5px 0, 100% 0, 100% calc(100% - 5px), calc(100% - 5px) 100%, 0 100%, 0 5px);
}
.page-faq .faq-block__intro {
  margin: 0 0 20px;
  max-width: 62ch;
  color: var(--steel);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 插图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 22px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  overflow: hidden;
}
.page-faq .faq-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-faq .faq-figure .media__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--steel);
}

/* ---------- 问答项 ---------- */
.page-faq .qa-list {
  border-bottom: 1px solid var(--line-soft);
}
.page-faq .qa {
  position: relative;
  padding-left: 14px;
  border-top: 1px solid var(--line-soft);
}
.page-faq .qa::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: transparent;
  transition: background .24s var(--ease);
}
.page-faq .qa[open]::before {
  background: var(--faq-accent);
}
.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 6px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--mist);
  transition: color .2s var(--ease);
}
.page-faq .qa__q::-webkit-details-marker {
  display: none;
}
.page-faq .qa__q:hover {
  color: var(--faq-accent);
}
.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}
.page-faq .qa__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  color: var(--faq-accent);
}
.page-faq .qa__icon {
  position: relative;
  flex: 0 0 auto;
  width: 15px;
  height: 15px;
  margin-top: 7px;
  margin-left: auto;
}
.page-faq .qa__icon::before,
.page-faq .qa__icon::after {
  content: "";
  position: absolute;
  background: var(--faq-accent);
  transition: transform .24s var(--ease), opacity .24s var(--ease);
}
.page-faq .qa__icon::before {
  top: 50%;
  left: 0;
  width: 100%;
  height: 1.5px;
  transform: translateY(-50%);
}
.page-faq .qa__icon::after {
  left: 50%;
  top: 0;
  width: 1.5px;
  height: 100%;
  transform: translateX(-50%);
}
.page-faq .qa[open] .qa__icon::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}
.page-faq .qa__a {
  padding: 0 6px 18px 26px;
  max-width: 68ch;
  color: var(--steel);
  font-size: 15px;
  line-height: 1.85;
}
.page-faq .qa__a p {
  margin: 0;
}
.page-faq .qa[open] .qa__a {
  animation: faqFade .28s var(--ease);
}
@keyframes faqFade {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: none; }
}
.page-faq .hl {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
  letter-spacing: .02em;
}

/* ---------- 收尾 ---------- */
.page-faq .faq-help {
  margin-top: 12px;
}
.page-faq .faq-help__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 28px;
  padding: 26px 22px;
  border-left: 3px solid var(--orange);
  background:
    linear-gradient(120deg, rgba(255, 138, 61, .12), rgba(11, 30, 58, 0) 62%),
    var(--ink-800);
}
.page-faq .faq-help__title {
  flex: 0 0 auto;
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: .02em;
  color: var(--mist);
}
.page-faq .faq-help__text {
  flex: 1 1 260px;
  margin: 0;
  color: var(--steel);
  font-size: 14.5px;
  line-height: 1.8;
}

/* ---------- 断点：平板以上 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-block__num { font-size: 13px; }
  .page-faq .qa__q { font-size: 16px; }
  .page-faq .qa__a {
    padding-left: 34px;
    font-size: 15.5px;
  }
  .page-faq .faq-help__inner { padding: 30px 30px; }
}

/* ---------- 断点：桌面 ---------- */
@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-nav-w) minmax(0, 1fr);
    gap: 56px;
    padding-top: 44px;
    align-items: start;
  }
  .page-faq .faq-nav {
    position: sticky;
    top: 104px;
  }
  .page-faq .faq-nav__list {
    display: block;
    overflow: visible;
    border-left: 1px solid var(--line);
  }
  .page-faq .faq-nav__item {
    display: block;
  }
  .page-faq .faq-nav__link {
    position: relative;
    display: block;
    padding: 11px 0 11px 18px;
    border: 0;
    background: none;
    clip-path: none;
    white-space: normal;
    line-height: 1.45;
    font-size: 14.5px;
  }
  .page-faq .faq-nav__link:hover,
  .page-faq .faq-nav__link:focus-visible {
    background: none;
    color: var(--mist);
  }
  .page-faq .faq-nav__link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 50%;
    width: 1px;
    height: 16px;
    background: var(--cyan);
    transform: translateY(-50%) scaleY(0);
    transition: transform .22s var(--ease);
  }
  .page-faq .faq-nav__link:hover::before,
  .page-faq .faq-nav__link:focus-visible::before {
    transform: translateY(-50%) scaleY(1);
  }
  .page-faq .faq-nav__num {
    display: inline-block;
    margin-right: 8px;
  }
  .page-faq .qa__q { padding: 18px 8px; }
  .page-faq .qa__a { padding: 0 8px 20px 36px; }
}

/* ---------- 降低动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .qa[open] .qa__a { animation: none; }
  .page-faq .qa::before,
  .page-faq .qa__icon::before,
  .page-faq .qa__icon::after,
  .page-faq .faq-nav__link,
  .page-faq .faq-nav__link::before,
  .page-faq .faq-inline-link {
    transition: none;
  }
}