.page-faq {
  --faq-rail-w: 220px;
  --faq-top-offset: calc(var(--topbar-h) + 20px);
  display: block;
  background: var(--ink-900);
  color: var(--white);
  font-family: var(--font-head);
  overflow-x: clip;
}

/* ===== 首屏 ===== */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: clamp(22px, 4.5vw, 46px) 0 clamp(26px, 5vw, 56px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.55;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(105deg, rgba(0, 0, 0, 0.95), transparent 74%);
  mask-image: linear-gradient(105deg, rgba(0, 0, 0, 0.95), transparent 74%);
}

.page-faq .faq-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
}

@media (min-width: 900px) {
  .page-faq .faq-hero-inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(240px, 0.75fr);
    align-items: end;
  }
}

.page-faq .breadcrumb {
  margin-bottom: clamp(16px, 3vw, 26px);
}

.page-faq .crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--moss);
}

.page-faq .crumb-list > li {
  margin: 0;
}

.page-faq .crumb-link {
  color: var(--moss);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-faq .crumb-link:hover,
.page-faq .crumb-link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-faq .crumb-sep {
  color: var(--line);
}

.page-faq .crumb-current {
  color: var(--silver);
}

.page-faq .faq-title {
  margin: 10px 0 0;
  max-width: 20ch;
  font-size: clamp(1.75rem, 6.2vw, 3.2rem);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.025em;
  color: var(--white);
}

.page-faq .faq-lede {
  margin: clamp(14px, 2.2vw, 20px) 0 0;
  max-width: 56ch;
  font-size: clamp(0.95rem, 1.6vw, 1.06rem);
  line-height: 1.8;
  color: var(--silver);
}

.page-faq .faq-hero-meta {
  display: grid;
  gap: 16px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

@media (min-width: 900px) {
  .page-faq .faq-hero-meta {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 22px;
  }
}

.page-faq .faq-hero-num {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
}

.page-faq .faq-hero-num .display-num {
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 8vw, 3.6rem);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--lime);
}

.page-faq .faq-hero-num-label {
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--moss);
}

.page-faq .faq-facts {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-facts li {
  display: grid;
  grid-template-columns: 16px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  font-size: 0.78rem;
  line-height: 1.55;
  letter-spacing: 0.02em;
  color: var(--silver);
}

.page-faq .faq-facts li::before {
  content: "";
  display: block;
  height: 1px;
  background: var(--lime);
}

/* ===== 横向主题带 ===== */
.page-faq .faq-band {
  border-bottom: 1px solid var(--line);
  background: var(--ink-800);
}

.page-faq .faq-band-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  padding-top: 12px;
  padding-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--silver);
}

.page-faq .faq-band-label {
  flex: none;
  color: var(--lime);
}

.page-faq .faq-band-text {
  flex: 1 1 auto;
  min-width: 0;
  line-height: 1.6;
}

.page-faq .faq-band-rule {
  position: relative;
  flex: 1 1 60px;
  min-width: 40px;
  height: 1px;
  background: var(--line);
}

.page-faq .faq-band-rule::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -5px;
  height: 11px;
  background-image: repeating-linear-gradient(to right, var(--line) 0 1px, transparent 1px 14px);
}

/* ===== 主布局 ===== */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  padding-top: clamp(26px, 5vw, 58px);
  padding-bottom: clamp(34px, 6vw, 78px);
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }
}

/* ===== 左侧索引 ===== */
.page-faq .faq-rail {
  min-width: 0;
}

@media (min-width: 1000px) {
  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-top-offset);
    align-self: start;
    max-height: calc(100vh - var(--topbar-h) - 40px);
    overflow: auto;
  }
}

.page-faq .faq-rail-title {
  margin: 0 0 12px;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--moss);
}

.page-faq .faq-index {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-faq .faq-index-item {
  flex: 0 0 auto;
}

@media (min-width: 1000px) {
  .page-faq .faq-index {
    flex-direction: column;
    gap: 2px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-faq .faq-index-item {
    flex: none;
  }
}

.page-faq .faq-index-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  color: var(--silver);
  font-size: 0.86rem;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

@media (min-width: 1000px) {
  .page-faq .faq-index-link {
    border: 0;
    border-left: 2px solid var(--line);
    padding: 11px 12px;
    white-space: normal;
  }
}

.page-faq .faq-index-link:hover,
.page-faq .faq-index-link:focus-visible {
  color: var(--white);
  border-left-color: var(--lime);
  background: var(--ink-800);
}

.page-faq .faq-index-link:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-faq .faq-index-num {
  flex: none;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--moss);
  transition: color 0.18s ease;
}

.page-faq .faq-index-link:hover .faq-index-num,
.page-faq .faq-index-link:focus-visible .faq-index-num {
  color: var(--lime);
}

/* ===== 折叠问答组 ===== */
.page-faq .faq-main {
  min-width: 0;
}

.page-faq .faq-group {
  border-top: 1px solid var(--line);
  scroll-margin-top: var(--faq-top-offset);
}

.page-faq .faq-group:last-child {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group-head {
  margin: 0;
  font-size: 1rem;
  font-weight: 400;
}

.page-faq .faq-toggle {
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(10px, 2vw, 20px);
  margin: 0;
  padding: clamp(16px, 2.6vw, 24px) 2px;
  background: transparent;
  border: 0;
  color: var(--white);
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  transition: background-color 0.18s ease;
}

.page-faq .faq-toggle:hover {
  background: rgba(200, 244, 90, 0.05);
}

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

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--moss);
  transition: color 0.18s ease;
}

.page-faq .faq-toggle[aria-expanded="true"] .faq-num {
  color: var(--lime);
}

.page-faq .faq-topic {
  font-size: clamp(1.02rem, 2.4vw, 1.28rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-sign {
  position: relative;
  flex: none;
  justify-self: end;
  width: 22px;
  height: 22px;
  border: 1px solid var(--line);
  transition: border-color 0.18s ease;
}

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

.page-faq .faq-sign::before {
  left: 5px;
  right: 5px;
  top: 50%;
  height: 2px;
  margin-top: -1px;
}

.page-faq .faq-sign::after {
  top: 5px;
  bottom: 5px;
  left: 50%;
  width: 2px;
  margin-left: -1px;
}

.page-faq .faq-toggle[aria-expanded="true"] .faq-sign {
  border-color: var(--lime);
}

.page-faq .faq-toggle[aria-expanded="true"] .faq-sign::after {
  transform: scaleY(0);
  opacity: 0;
}

/* ===== 面板与答案 ===== */
.page-faq .faq-panel[hidden] {
  display: none;
}

.page-faq .faq-panel {
  border-top: 1px solid var(--line);
  background: linear-gradient(to bottom, rgba(20, 48, 42, 0.5), transparent 72%);
}

.page-faq .faq-panel-inner {
  display: grid;
  gap: clamp(22px, 3.4vw, 32px);
  padding: clamp(20px, 3vw, 30px) 2px clamp(24px, 3.6vw, 36px) clamp(0px, 2vw, 48px);
}

.page-faq .faq-qa {
  display: grid;
  gap: 10px;
  max-width: 72ch;
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.page-faq .qa-question {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 8px;
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.6;
  color: var(--white);
}

.page-faq .qa-question::before {
  content: "Q";
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-faq .qa-answer {
  margin: 0;
  max-width: 62ch;
  padding-left: 26px;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-faq .qa-answer .mono {
  color: var(--white);
  font-size: 0.92em;
}

/* ===== 配图 ===== */
.page-faq .faq-figure {
  margin: 4px 0 0;
  padding: 0;
  max-width: 640px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--ink-800);
  object-fit: cover;
}

.page-faq .faq-figure--wide img {
  aspect-ratio: 1000 / 625;
}

.page-faq .faq-figure--support img {
  aspect-ratio: 3 / 2;
}

.page-faq .faq-figure .media-caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--moss);
}

/* ===== 收束带 ===== */
.page-faq .faq-outro {
  border-top: 1px solid var(--line);
  background: var(--ink-800);
  padding: clamp(32px, 5vw, 64px) 0;
}

.page-faq .faq-outro-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.5vw, 40px);
}

@media (min-width: 820px) {
  .page-faq .faq-outro-inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(240px, 0.7fr);
    align-items: start;
  }
}

.page-faq .faq-outro-title {
  margin: 10px 0 0;
  max-width: 24ch;
  font-size: clamp(1.3rem, 3.4vw, 2rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-faq .faq-outro-text {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-faq .faq-outro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-faq .faq-outro-nav {
  padding-top: 4px;
}

@media (min-width: 820px) {
  .page-faq .faq-outro-nav {
    border-left: 1px solid var(--line);
    padding-left: 26px;
  }
}

.page-faq .faq-outro-nav-title {
  margin: 0 0 12px;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--moss);
}

.page-faq .faq-outro-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 0.88rem;
}

.page-faq .faq-outro-links a {
  line-height: 1.6;
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}