.page-faq {
  --faq-toc-width: 260px;
  --faq-code-bg: #0d1524;
  background-color: var(--color-bg);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  background-position: center top;
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.7;
  min-height: 70vh;
}

.page-faq .faq-container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-2);
}

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: 40px var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -120px;
  right: -160px;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 191, 255, 0.1) 0%, rgba(0, 191, 255, 0) 65%);
  pointer-events: none;
}

.page-faq .faq-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-secondary);
}

.page-faq .faq-breadcrumb a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.page-faq .faq-breadcrumb a:hover,
.page-faq .faq-breadcrumb a:focus-visible {
  color: var(--color-accent-green);
}

.page-faq .faq-breadcrumb__sep {
  opacity: 0.5;
}

.page-faq .faq-breadcrumb [aria-current="page"] {
  color: var(--color-accent-green);
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 20px;
}

.page-faq .faq-hero__title {
  margin: 0;
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(38px, 8vw, 72px);
  line-height: 0.95;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.page-faq .faq-hero__title span {
  display: block;
  margin-top: 12px;
  font-size: clamp(17px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text-secondary);
}

.page-faq .faq-hero__sub {
  max-width: 46ch;
  margin: 0;
  padding-left: 16px;
  border-left: 3px solid var(--color-accent-blue);
  font-size: 15px;
  color: var(--color-text-secondary);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.page-faq .faq-hero__meta-item {
  padding: 4px 12px;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.page-faq .faq-hero__meta-item strong {
  font-weight: 600;
  color: var(--color-accent-green);
}

.page-faq .faq-layout {
  padding-block: var(--space-3) var(--space-5);
}

.page-faq .faq-toc {
  position: sticky;
  top: var(--header-height);
  z-index: 20;
  margin-inline: calc(-1 * var(--space-2));
  padding: 12px var(--space-2);
  border-bottom: 1px solid var(--color-border);
  background: rgba(10, 14, 23, 0.92);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.page-faq .faq-toc__heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
}

.page-faq .faq-toc__count {
  color: var(--color-accent-green);
}

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

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

.page-faq .faq-toc__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid transparent;
  white-space: nowrap;
  font-size: 14px;
  text-decoration: none;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.page-faq .faq-toc__link:hover {
  background: rgba(0, 255, 136, 0.06);
  color: var(--color-text);
}

.page-faq .faq-toc__link:focus-visible {
  outline: 2px solid var(--color-accent-green);
  outline-offset: 2px;
}

.page-faq .faq-toc__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent-blue);
}

.page-faq .faq-toc__note {
  display: none;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  font-size: 12px;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.page-faq .faq-kbd {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid var(--color-border);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--faq-code-bg);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent-blue);
}

.page-faq .faq-group {
  margin-bottom: var(--space-4);
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: var(--space-2);
  padding: 12px 10px 12px 18px;
  border-bottom: 2px solid var(--color-border);
  background: linear-gradient(90deg, rgba(0, 255, 136, 0.06), transparent 40%);
  transition: border-color var(--transition-fast);
}

.page-faq .faq-group:target .faq-group__head {
  border-bottom-color: var(--color-accent-green);
}

.page-faq .faq-group:target .faq-group__num {
  color: var(--color-accent-green);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-accent-blue);
  transition: color var(--transition-fast);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 30px;
  font-style: italic;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.5px;
}

.page-faq .faq-group__tag {
  margin-left: auto;
  padding: 2px 8px;
  border: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-secondary);
}

.page-faq .faq-item {
  margin-bottom: var(--space-2);
  border: 1px solid var(--color-border);
  background: rgba(17, 24, 39, 0.5);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.page-faq .faq-item:hover {
  border-color: #374151;
}

.page-faq .faq-item:focus-within {
  border-color: var(--color-accent-green);
}

.page-faq .faq-item[open] {
  background: rgba(17, 24, 39, 0.75);
}

.page-faq .faq-item__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 48px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
}

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

.page-faq .faq-item[open] .faq-item__summary {
  border-bottom: 1px solid rgba(0, 255, 136, 0.12);
}

.page-faq .faq-item__no {
  flex-shrink: 0;
  padding: 2px 6px;
  border: 1px solid rgba(0, 191, 255, 0.18);
  background: rgba(0, 191, 255, 0.08);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent-blue);
}

.page-faq .faq-item__q {
  flex: 1;
  font-size: 16px;
  font-weight: 650;
  line-height: 1.45;
}

.page-faq .faq-item__toggle {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--color-accent-green);
  clip-path: polygon(0 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.page-faq .faq-item__toggle::before {
  content: "+";
  line-height: 1;
}

.page-faq .faq-item[open] .faq-item__toggle {
  border-color: rgba(0, 255, 136, 0.3);
  background: rgba(0, 255, 136, 0.1);
}

.page-faq .faq-item[open] .faq-item__toggle::before {
  content: "\2013";
}

.page-faq .faq-item__answer {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 0.25s ease, opacity 0.2s ease;
}

.page-faq .faq-item[open] .faq-item__answer {
  grid-template-rows: 1fr;
  opacity: 1;
}

.page-faq .faq-item__inner {
  min-height: 0;
  overflow: hidden;
  padding: 0 16px 16px;
  font-size: 15px;
  line-height: 1.8;
  overflow-wrap: anywhere;
}

.page-faq .faq-answer {
  margin: 0 0 10px;
  color: var(--color-text-secondary);
}

.page-faq .faq-inline-link {
  color: var(--color-accent-blue);
  text-decoration: underline;
  text-decoration-color: rgba(0, 191, 255, 0.4);
  text-underline-offset: 3px;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

.page-faq .faq-inline-link:hover,
.page-faq .faq-inline-link:focus-visible {
  color: var(--color-accent-green);
  text-decoration-color: var(--color-accent-green);
}

.page-faq .faq-steps__title {
  margin: 12px 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--color-accent-green);
}

.page-faq .faq-steps {
  counter-reset: faqstep;
  margin: 0 0 12px;
  padding: 12px 16px 12px;
  border: 1px solid var(--color-border);
  background: rgba(0, 0, 0, 0.18);
  list-style: none;
}

.page-faq .faq-steps > li {
  position: relative;
  counter-increment: faqstep;
  margin-bottom: 6px;
  padding-left: 32px;
  color: var(--color-text-secondary);
}

.page-faq .faq-steps > li:last-child {
  margin-bottom: 0;
}

.page-faq .faq-steps > li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border: 1px solid rgba(0, 191, 255, 0.3);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent-blue);
}

.page-faq .faq-path {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid rgba(0, 191, 255, 0.2);
  border-radius: 2px;
  background: rgba(0, 191, 255, 0.07);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent-blue);
}

.page-faq .faq-tip {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 14px;
  padding: 10px 12px;
  border-left: 3px solid var(--color-accent-orange);
  background: rgba(255, 69, 0, 0.05);
  font-size: 14px;
  color: var(--color-text);
}

.page-faq .faq-tip--blue {
  border-left-color: var(--color-accent-blue);
  background: rgba(0, 191, 255, 0.05);
}

.page-faq .faq-tip--blue .faq-tip__label {
  color: var(--color-accent-blue);
}

.page-faq .faq-tip__label {
  flex-shrink: 0;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent-orange);
}

.page-faq .faq-figure {
  margin: 16px 0 4px;
  border: 1px solid var(--color-border);
  background: var(--color-deep);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 500px;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  padding: 8px 12px;
  border-top: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-secondary);
}

.page-faq .faq-related {
  padding-block: var(--space-4);
  border-top: 1px solid var(--color-border);
  background: rgba(5, 8, 16, 0.6);
}

.page-faq .faq-related__head {
  margin-bottom: var(--space-3);
}

.page-faq .faq-related__label {
  display: inline-block;
  margin-bottom: 6px;
  padding-left: 12px;
  border-left: 3px solid var(--color-accent-blue);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent-blue);
}

.page-faq .faq-related__title {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: 34px;
  font-style: italic;
  font-weight: 900;
  line-height: 1;
}

.page-faq .faq-related__sub {
  max-width: 56ch;
  margin: 0;
  color: var(--color-text-secondary);
}

.page-faq .faq-related__grid {
  display: grid;
  gap: var(--space-2);
}

.page-faq .faq-related__link {
  --entry-accent: var(--color-border);
  display: block;
  padding: 16px;
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--entry-accent);
  background: rgba(17, 24, 39, 0.5);
  text-decoration: none;
  color: var(--color-text);
  transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.page-faq .faq-related__link--home {
  --entry-accent: var(--color-accent-green);
}

.page-faq .faq-related__link--download {
  --entry-accent: var(--color-accent-blue);
}

.page-faq .faq-related__link--about {
  --entry-accent: var(--color-accent-blue);
}

.page-faq .faq-related__link--contact {
  --entry-accent: var(--color-accent-orange);
}

.page-faq .faq-related__link:hover {
  background: rgba(17, 24, 39, 0.9);
  border-color: var(--entry-accent);
  transform: translateY(-2px);
}

.page-faq .faq-related__link:focus-visible {
  outline: 2px solid var(--color-accent-green);
  outline-offset: 2px;
}

.page-faq .faq-related__num {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent-blue);
}

.page-faq .faq-related__name {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.4px;
}

.page-faq .faq-related__desc {
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-text-secondary);
}

@media (min-width: 720px) {
  .page-faq .faq-container {
    padding-inline: var(--space-3);
  }

  .page-faq .faq-item__inner {
    padding: 0 20px 20px 52px;
  }

  .page-faq .faq-related__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero {
    padding-block: 72px var(--space-5);
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1fr) 420px;
    gap: var(--space-5);
    align-items: end;
  }

  .page-faq .faq-hero__sub {
    margin-bottom: 8px;
  }

  .page-faq .faq-hero__meta {
    grid-column: 1 / -1;
  }

  .page-faq .faq-layout {
    display: grid;
    grid-template-columns: var(--faq-toc-width) minmax(0, 1fr);
    gap: var(--space-4);
    align-items: start;
  }

  .page-faq .faq-toc {
    position: sticky;
    top: calc(var(--header-height) + 24px);
    margin-inline: 0;
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    background: transparent;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }

  .page-faq .faq-toc__list {
    flex-direction: column;
    gap: 2px;
    overflow-x: visible;
  }

  .page-faq .faq-toc__link {
    white-space: normal;
    padding: 10px 12px;
    border-left: 2px solid transparent;
  }

  .page-faq .faq-toc__link:hover {
    border-left-color: var(--color-accent-green);
    background: linear-gradient(90deg, rgba(0, 255, 136, 0.06), transparent);
  }

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

  .page-faq .faq-group__title {
    font-size: 36px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-related__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}