.page-faq {
  background: var(--ink);
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(26px, 4.5vw, 52px) 0 clamp(30px, 5vw, 60px);
  background:
    radial-gradient(120% 100% at 88% -20%, rgba(53, 240, 200, 0.12), transparent 58%),
    var(--ink);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), rgba(53, 240, 200, 0.15) 38%, var(--flame) 94%);
}

.page-faq .breadcrumb {
  margin-bottom: clamp(16px, 3vw, 28px);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(34px, 6.8vw, 78px);
  line-height: 1.06;
  letter-spacing: -0.005em;
  color: var(--text);
  margin: 12px 0 18px;
  max-width: 20ch;
}

.page-faq .faq-hero .lede {
  max-width: 66ch;
  color: var(--cyan-soft);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  margin: 0;
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 22px;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-stats__item dt {
  font-family: var(--font-narrow);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-stats__item dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(15px, 2vw, 19px);
  font-weight: 600;
  color: var(--cyan);
}

/* ---------- 双栏骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 46px);
  padding-top: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(56px, 8vw, 108px);
}

/* ---------- 左侧分类轨道 ---------- */
.page-faq .faq-rail {
  background: var(--panel);
  padding: 20px 18px 22px;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-narrow);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--flame);
}

.page-faq .faq-rail__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 20px;
}

.page-faq .faq-rail__nav a {
  display: block;
  padding: 8px 12px;
  font-family: var(--font-narrow);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-faq .faq-rail__nav a:hover,
.page-faq .faq-rail__nav a:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: var(--panel-2);
}

.page-faq .faq-rail__nav a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 1px;
}

.page-faq .faq-rail .finder {
  margin: 0 0 10px;
}

.page-faq .faq-rail .finder__input {
  width: 100%;
  box-sizing: border-box;
  background: var(--ink);
  border: 1px solid var(--line);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 14px;
  padding: 10px 12px;
}

.page-faq .faq-rail .finder__input::placeholder {
  color: var(--muted);
}

.page-faq .faq-rail .finder__input:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 1px;
  border-color: var(--cyan);
}

.page-faq .faq-rail__hint {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

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

.page-faq .faq-group {
  scroll-margin-top: 24px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(46px, 6vw, 82px);
}

.page-faq .faq-group__head {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  align-items: baseline;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-group__head::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 58px;
  height: 2px;
  background: var(--cyan);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--flame);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(21px, 2.9vw, 30px);
  line-height: 1.28;
  letter-spacing: 0.01em;
  color: var(--text);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  margin-top: 10px;
  background: var(--panel);
  transition: background-color 0.18s ease;
}

.page-faq .qa:hover,
.page-faq .qa[open] {
  background: var(--panel-2);
}

.page-faq .qa__q {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 22px;
  gap: 12px;
  align-items: center;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  color: var(--text);
  font-size: clamp(15px, 1.7vw, 16.5px);
  font-weight: 500;
  line-height: 1.6;
}

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

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

.page-faq .qa__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--flame);
}

.page-faq .qa__sign {
  position: relative;
  justify-self: end;
  width: 16px;
  height: 16px;
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 0.18s ease, opacity 0.18s ease;
}

.page-faq .qa__sign::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-faq .qa__sign::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-faq .qa[open] .qa__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .qa__a {
  background: var(--doc);
  color: var(--ink);
  border-left: 3px solid var(--cyan);
  padding: 18px 20px 20px;
  font-size: 15px;
  line-height: 1.85;
}

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

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

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

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

.page-faq .faq-shot img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.06) brightness(0.9);
}

.page-faq .faq-shot figcaption {
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-shot--wide {
  margin: 18px 0 4px;
}

/* ---------- 图文并排分组 ---------- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 4px;
}

.page-faq .faq-split .faq-shot {
  margin: 0;
}

/* ---------- 相关问题 ---------- */
.page-faq .rel {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-faq .rel__label {
  margin: 0 0 10px;
  font-family: var(--font-narrow);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .rel__row {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.page-faq .rel__item {
  flex: 0 0 auto;
  padding: 8px 14px;
  border: 1px solid var(--line);
  color: var(--cyan-soft);
  font-size: 13.5px;
  line-height: 1.5;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-faq .rel__item:hover,
.page-faq .rel__item:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 280px) minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-shell {
    grid-template-columns: minmax(210px, 250px) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 20px;
  }

  .page-faq .faq-rail__nav {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }
}

@media (max-width: 560px) {
  .page-faq .qa__q {
    grid-template-columns: 32px minmax(0, 1fr) 20px;
    gap: 8px;
    padding: 14px 14px;
  }

  .page-faq .qa__a {
    padding: 16px 16px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__sign::before,
  .page-faq .qa__sign::after,
  .page-faq .faq-rail__nav a,
  .page-faq .rel__item {
    transition: none;
  }
}