.page-faq {
  --faq-bg: #0a1228;
  --faq-bg-deep: #050810;
  --faq-panel: #1f2c4c;
  --faq-text: #f5f7fa;
  --faq-muted: #b8c0d0;
  --faq-green: #39ff88;
  --faq-orange: #ff5a36;
  --faq-yellow: #ffd166;
  --faq-glass-line: rgba(255, 255, 255, 0.12);
  --faq-grid-line: rgba(57, 255, 136, 0.18);
  --faq-grid-line-strong: rgba(57, 255, 136, 0.35);
  --faq-font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --faq-font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Roboto Mono", Menlo, monospace;
  --faq-radius: 16px;
  --faq-gutter: clamp(1.25rem, 4vw, 2.5rem);
  background: var(--faq-bg);
  color: var(--faq-text);
  font-family: var(--faq-font-sans);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

.page-faq__breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem var(--faq-gutter) 0;
}

.page-faq__breadcrumb .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.8125rem;
}

.page-faq__breadcrumb .breadcrumb__item {
  position: relative;
}

.page-faq__breadcrumb .breadcrumb__item + .breadcrumb__item::before {
  content: "→";
  margin-right: 1rem;
  font-family: var(--faq-font-mono);
  color: var(--faq-green);
  opacity: 0.6;
}

.page-faq__breadcrumb a {
  color: var(--faq-muted);
  text-decoration: none;
  transition: color 240ms ease;
}

.page-faq__breadcrumb a:hover,
.page-faq__breadcrumb a[aria-current="page"] {
  color: var(--faq-green);
}

.page-faq__sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.page-faq__hero {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem var(--faq-gutter) 2.5rem;
}

.page-faq__hero::before {
  content: "";
  position: absolute;
  top: 2rem;
  right: 2rem;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(57, 255, 136, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.page-faq__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  position: relative;
}

.page-faq__display-title {
  font-size: clamp(2rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0.5rem 0 0.75rem;
  color: var(--faq-text);
}

.page-faq__hero-subtitle {
  font-size: clamp(1.125rem, 2.4vw, 1.75rem);
  font-weight: 500;
  margin: 0 0 0.75rem;
  color: var(--faq-green);
  letter-spacing: 0.01em;
}

.page-faq__hero-note {
  max-width: 44rem;
  font-size: 1rem;
  color: var(--faq-muted);
  margin: 0 0 1.5rem;
}

.page-faq__search-wrap {
  position: relative;
  max-width: 36rem;
  display: flex;
  align-items: center;
  background: rgba(31, 44, 76, 0.6);
  border: 1px solid var(--faq-glass-line);
  border-radius: 999px;
  padding: 0.625rem 1rem 0.625rem 2.75rem;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: border-color 240ms ease, box-shadow 240ms ease;
}

.page-faq__search-wrap:focus-within {
  border-color: var(--faq-green);
  box-shadow: 0 0 0 3px rgba(57, 255, 136, 0.15);
}

.page-faq__search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--faq-green);
  pointer-events: none;
}

.page-faq__search-input {
  flex: 1;
  background: transparent;
  border: 0;
  outline: 0;
  color: var(--faq-text);
  font-size: 0.9375rem;
  font-family: var(--faq-font-sans);
  padding: 0.25rem 0;
}

.page-faq__search-input::placeholder {
  color: rgba(184, 192, 208, 0.7);
}

.page-faq__search-hint {
  font-family: var(--faq-font-mono);
  font-size: 0.75rem;
  color: rgba(57, 255, 136, 0.7);
  white-space: nowrap;
  display: none;
}

.page-faq__hero-data {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 200px;
  height: 160px;
  display: none;
}

.page-faq__hero-data-label {
  font-family: var(--faq-font-mono);
  font-size: 0.65rem;
  color: var(--faq-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.page-faq__hero-data-code {
  position: absolute;
  right: 0;
  bottom: 3rem;
  font-family: var(--faq-font-mono);
  font-size: 0.75rem;
  color: var(--faq-green);
}

.page-faq__hero-data-code span {
  color: var(--faq-orange);
}

.page-faq__hero-data-line {
  position: absolute;
  right: 0;
  bottom: 2rem;
  width: 160px;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--faq-green));
}

.page-faq__hero-data-grid {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 160px;
  height: 1.5rem;
  background-image: linear-gradient(to right, var(--faq-grid-line) 1px, transparent 1px);
  background-size: 16px 100%;
}

.page-faq__hero-data-num {
  position: absolute;
  right: 0;
  top: 0;
  font-family: var(--faq-font-mono);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--faq-text);
  opacity: 0.1;
}

.page-faq__layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--faq-gutter) 4rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-faq__sidebar {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.page-faq__sidebar-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--faq-glass-line);
}

.page-faq__sidebar-index {
  font-family: var(--faq-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--faq-muted);
  text-transform: uppercase;
}

.page-faq__sidebar-coord {
  font-family: var(--faq-font-mono);
  font-size: 0.75rem;
  color: var(--faq-green);
}

.page-faq__nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-faq__nav-item {
  flex: 0 1 auto;
}

.page-faq__nav-link {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.625rem 0.875rem;
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--faq-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: background 240ms ease, border-color 240ms ease, color 240ms ease, box-shadow 240ms ease;
}

.page-faq__nav-link svg {
  flex-shrink: 0;
  color: currentColor;
}

.page-faq__nav-link:hover {
  color: var(--faq-green);
  border-color: rgba(57, 255, 136, 0.25);
  box-shadow: 0 0 20px rgba(57, 255, 136, 0.08);
}

.page-faq__nav-link.is-active {
  color: var(--faq-green);
  border-color: rgba(57, 255, 136, 0.35);
  background: linear-gradient(135deg, rgba(57, 255, 136, 0.08), transparent);
}

.page-faq__nav-count {
  font-family: var(--faq-font-mono);
  font-size: 0.6875rem;
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
  background: rgba(57, 255, 136, 0.1);
  color: var(--faq-green);
  margin-left: auto;
}

.page-faq__sidebar-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 14px;
  object-fit: cover;
  aspect-ratio: 3 / 4;
  display: none;
}

.page-faq__content {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
}

.page-faq__category {
  scroll-margin-top: 90px;
}

.page-faq__category-head {
  display: flex;
  align-items: baseline;
  gap: 0.875rem;
  margin-bottom: 0.5rem;
}

.page-faq__category-tag {
  font-family: var(--faq-font-mono);
  font-size: 0.8125rem;
  color: var(--faq-orange);
  letter-spacing: 0.08em;
}

.page-faq__category-title {
  font-size: clamp(1.375rem, 3.4vw, 2rem);
  font-weight: 700;
  margin: 0;
  color: var(--faq-text);
  letter-spacing: -0.01em;
}

.page-faq__category-desc {
  color: var(--faq-muted);
  font-size: 0.9375rem;
  margin: 0 0 1.75rem;
  max-width: 38rem;
}

.page-faq__item {
  border-top: 1px solid var(--faq-glass-line);
  border-left: 3px solid transparent;
  transition: border-left-color 240ms ease, background 240ms ease;
}

.page-faq__item:hover {
  border-left-color: rgba(57, 255, 136, 0.35);
}

.page-faq__question {
  margin: 0;
}

.page-faq__toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 1.125rem 0.75rem 1.125rem 0;
  background: none;
  border: 0;
  cursor: pointer;
  color: var(--faq-text);
  font-family: var(--faq-font-sans);
  text-align: left;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.45;
  transition: color 240ms ease;
}

.page-faq__toggle:hover {
  color: var(--faq-green);
}

.page-faq__toggle-num {
  font-family: var(--faq-font-mono);
  font-size: 0.75rem;
  color: var(--faq-muted);
  flex-shrink: 0;
  opacity: 0.7;
}

.page-faq__toggle-text {
  flex: 1;
}

.page-faq__toggle-icon {
  position: relative;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-left: auto;
}

.page-faq__toggle-icon::before,
.page-faq__toggle-icon::after {
  content: "";
  position: absolute;
  background: var(--faq-green);
  transition: transform 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

.page-faq__toggle[aria-expanded="true"] .page-faq__toggle-icon::before {
  transform: rotate(180deg);
}

.page-faq__toggle[aria-expanded="true"] .page-faq__toggle-icon::after {
  transform: scaleY(0);
}

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

.page-faq__answer {
  display: none;
  visibility: hidden;
}

.page-faq__answer.is-open {
  display: block;
  visibility: visible;
}

.page-faq__answer-inner {
  padding: 0 0.75rem 1.375rem 2.125rem;
  max-width: 42rem;
  color: var(--faq-muted);
  font-size: 0.9375rem;
  background: linear-gradient(135deg, rgba(57, 255, 136, 0.06), transparent 70%);
  border-radius: 0 0 12px 12px;
}

.page-faq__answer-inner p {
  margin: 0 0 0.75rem;
}

.page-faq__answer-inner p:last-child {
  margin-bottom: 0;
}

.page-faq__answer-inner a {
  color: var(--faq-green);
  text-decoration: none;
  font-family: var(--faq-font-mono);
  font-size: 0.8125rem;
  transition: all 240ms ease;
}

.page-faq__answer-inner a:hover {
  color: var(--faq-orange);
  text-decoration: underline;
}

.page-faq__contact-panel {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--faq-glass-line);
  min-height: 280px;
  display: flex;
  align-items: center;
  margin-top: 1rem;
}

.page-faq__contact-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.6;
}

.page-faq__contact-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(5, 8, 16, 0.92) 0%, rgba(10, 18, 40, 0.75) 55%, rgba(31, 44, 76, 0.35) 100%);
  pointer-events: none;
}

.page-faq__contact-copy {
  position: relative;
  padding: 2rem 1.5rem;
  max-width: 30rem;
}

.page-faq__contact-title {
  font-size: clamp(1.375rem, 3vw, 1.75rem);
  font-weight: 700;
  margin: 0 0 0.5rem;
  color: var(--faq-text);
}

.page-faq__contact-text {
  color: var(--faq-muted);
  font-size: 0.9375rem;
  margin: 0 0 1.25rem;
}

.page-faq__contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-faq__contact-actions .btn {
  border-radius: 999px;
}

@media (max-width: 639px) {
  .page-faq__hero-data-num {
    font-size: 1.75rem;
  }

  .page-faq__toggle {
    font-size: 0.9375rem;
    gap: 0.625rem;
    padding: 1rem 0.5rem 1rem 0;
  }

  .page-faq__category-head {
    flex-wrap: wrap;
  }

  .page-faq__answer-inner {
    padding-left: 1.625rem;
  }

  .page-faq__contact-copy {
    padding: 1.5rem 1.25rem;
  }

  .page-faq__contact-actions .btn {
    flex: 1 1 100%;
    justify-content: center;
  }
}

@media (min-width: 640px) {
  .page-faq__search-hint {
    display: inline-block;
    margin-left: 0.75rem;
    padding-left: 0.75rem;
    border-left: 1px solid var(--faq-glass-line);
  }

  .page-faq__hero {
    padding-top: 2rem;
    padding-bottom: 3.5rem;
  }

  .page-faq__hero-grid {
    grid-template-columns: 1fr 220px;
  }

  .page-faq__hero-data {
    display: block;
  }

  .page-faq__nav-list {
    flex-direction: column;
  }

  .page-faq__nav-item {
    display: block;
  }

  .page-faq__nav-link {
    justify-content: flex-start;
  }
}

@media (min-width: 960px) {
  .page-faq__layout {
    grid-template-columns: 260px 1fr;
    gap: 3rem;
  }

  .page-faq__sidebar {
    position: sticky;
    top: 90px;
    align-self: start;
    max-height: calc(100vh - 110px);
    overflow-y: auto;
    padding-right: 0.5rem;
  }

  .page-faq__sidebar-img {
    display: block;
  }

  .page-faq__content {
    gap: 4.5rem;
  }

  .page-faq__contact-copy {
    padding: 2.5rem 2.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq__toggle-icon::before,
  .page-faq__toggle-icon::after,
  .page-faq__search-wrap,
  .page-faq__nav-link,
  .page-faq__item,
  .page-faq__toggle {
    transition: none;
  }

  .page-faq__answer.is-open {
    transition: none;
  }
}