.page-faq {
  --faq-rail: 208px;
  --faq-ink-soft: #cfdcd6;
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-top: calc(var(--header-h) + clamp(18px, 4vw, 44px));
  padding-bottom: clamp(18px, 3vw, 30px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(640px 320px at 84% 8%, rgba(53, 240, 174, 0.13), transparent 68%),
    radial-gradient(520px 300px at 4% 92%, rgba(108, 99, 255, 0.14), transparent 70%);
}

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

.page-faq .faq-crumbs {
  margin-bottom: clamp(18px, 3vw, 32px);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(24px, 3vw, 46px);
  align-items: end;
}

.page-faq .faq-hero__title {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-size: clamp(34px, 6vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 17ch;
}

.page-faq .faq-hero__lead .lede {
  max-width: 58ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.65;
  color: var(--faq-ink-soft);
}

.page-faq .faq-hero__panel {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.page-faq .faq-hero__cell {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 8px;
  min-height: 104px;
  padding: 18px 20px;
  background: var(--ink-2);
  border: 1px solid var(--grid);
  border-radius: var(--radius-lg);
}

.page-faq .faq-hero__cell--wide {
  background:
    linear-gradient(140deg, rgba(53, 240, 174, 0.12), transparent 62%),
    var(--ink-2);
  border-color: rgba(53, 240, 174, 0.32);
}

.page-faq .faq-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 3.6vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
}

.page-faq .faq-hero__cell--amber .faq-hero__num {
  color: var(--amber);
}

.page-faq .faq-hero__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 筛选条 ---------- */
.page-faq .faq-workspace {
  position: relative;
}

.page-faq .faq-toolbar {
  position: sticky;
  top: var(--header-h);
  z-index: 12;
  margin-top: clamp(14px, 2.5vw, 26px);
  padding: 12px 0;
  background: rgba(10, 31, 26, 0.94);
  border-top: 1px solid var(--grid);
  border-bottom: 1px solid var(--grid);
  backdrop-filter: blur(10px);
}

.page-faq .faq-toolbar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 22px;
}

.page-faq .faq-toolbar .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-toolbar .filter-chip[aria-pressed="true"] {
  color: var(--signal);
  box-shadow: inset 0 0 0 1px var(--signal);
}

.page-faq .faq-toolbar__count {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-toolbar__count .num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--signal);
}

/* ---------- 主体：索引 + 问答流 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding-top: clamp(24px, 4vw, 44px);
}

.page-faq .faq-index {
  display: block;
}

.page-faq .faq-index__title {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-index__list {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-index__link {
  display: block;
  padding: 8px 16px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--grid);
  border-radius: var(--radius-pill);
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--paper);
  background: var(--ink-2);
  border-color: rgba(53, 240, 174, 0.5);
}

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

/* ---------- 分组 ---------- */
.page-faq .faq-stream {
  min-width: 0;
}

.page-faq .faq-group {
  padding: clamp(22px, 3vw, 34px) 0;
  border-top: 1px solid var(--grid);
  scroll-margin-top: calc(var(--header-h) + 84px);
}

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

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  margin-bottom: clamp(16px, 2vw, 24px);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--signal);
}

.page-faq .faq-group__title {
  flex: 1 1 auto;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.1;
  color: var(--paper);
}

.page-faq .faq-group__intro {
  flex: 1 1 100%;
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.62;
  color: var(--muted);
}

/* ---------- 插图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--grid);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-2);
}

.page-faq .faq-figure__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-faq .faq-figure__caption {
  padding: 10px 16px 12px;
  border-top: 1px solid var(--grid);
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 12px;
}

.page-faq .faq-item {
  background: var(--ink-2);
  border: 1px solid var(--grid);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.24s ease, background 0.24s ease;
}

.page-faq .faq-item[hidden] {
  display: none;
}

.page-faq .faq-item[open] {
  border-color: rgba(53, 240, 174, 0.42);
  background:
    linear-gradient(180deg, rgba(53, 240, 174, 0.07), transparent 58%),
    var(--ink-2);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 17px clamp(18px, 2.4vw, 26px);
  font-size: clamp(16px, 1.5vw, 18px);
  font-weight: 600;
  line-height: 1.48;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -3px;
  border-radius: var(--radius-lg);
}

.page-faq .faq-item__mark {
  position: relative;
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border: 1px solid var(--grid);
  border-radius: 50%;
  transition: border-color 0.24s ease;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--signal);
  border-radius: 2px;
  transition: transform 0.24s ease, opacity 0.24s ease;
}

.page-faq .faq-item__mark::before {
  width: 10px;
  height: 2px;
  left: 5px;
  top: 9px;
}

.page-faq .faq-item__mark::after {
  width: 2px;
  height: 10px;
  left: 9px;
  top: 5px;
}

.page-faq .faq-item[open] .faq-item__mark {
  border-color: var(--signal);
}

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

.page-faq .faq-item__a {
  padding: 0 clamp(18px, 2.4vw, 26px) clamp(18px, 2.4vw, 24px);
  animation: page-faq-panel-in 0.28s ease both;
}

@keyframes page-faq-panel-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
  max-width: 74ch;
  font-size: 16px;
  line-height: 1.74;
  color: var(--faq-ink-soft);
}

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

.page-faq .faq-item__a a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 174, 0.45);
  padding-bottom: 1px;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-hero__panel {
    grid-template-columns: 1fr 1fr;
  }

  .page-faq .faq-hero__cell--wide {
    grid-column: 1 / -1;
    min-height: 118px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  }

  .page-faq .faq-hero__title {
    margin-top: 14px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 88px);
  }

  .page-faq .faq-index__list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--grid);
  }

  .page-faq .faq-index__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-pill) var(--radius-pill) 0;
    margin-left: -1px;
    padding: 9px 14px;
    white-space: normal;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    background: var(--ink-2);
    border-left-color: var(--signal);
  }
}

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

  .page-faq .faq-item,
  .page-faq .faq-item__mark,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .faq-index__link {
    transition: none;
  }
}