.page-faq {
  position: relative;
  padding-bottom: clamp(2rem, 5vw, 4rem);
  background:
    radial-gradient(720px 320px at 88% 2%, rgba(0, 179, 212, 0.12), transparent 70%),
    radial-gradient(520px 260px at 6% 45%, rgba(125, 77, 154, 0.08), transparent 70%),
    var(--color-bg);
}

.page-faq .faq-hero {
  position: relative;
  padding-top: clamp(2.5rem, 6vw, 4.5rem);
  padding-bottom: clamp(2rem, 4vw, 3.25rem);
  border-bottom: 1px solid var(--color-border);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 34%;
  height: 100%;
  background: linear-gradient(135deg, rgba(0, 179, 212, 0.10), rgba(125, 77, 154, 0.06));
  clip-path: polygon(16% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

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

.page-faq .faq-hero h1 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2rem, 4.5vw, 3.75rem);
  line-height: 1.08;
  letter-spacing: 0.01em;
  margin: 0.75rem 0 1rem;
  max-width: 20ch;
  color: var(--color-ink);
}

.page-faq .faq-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-charcoal);
}

.page-faq .faq-hero-tags::before {
  content: "";
  width: 28px;
  height: 3px;
  align-self: center;
  border-radius: 3px;
  background: var(--color-accent);
}

.page-faq .faq-lead {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.75;
  color: var(--color-charcoal);
  max-width: 62ch;
  margin: 1.25rem 0 0;
}

.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-faq .faq-radio {
  position: absolute;
  left: -9999px;
  opacity: 0;
  pointer-events: none;
}

.page-faq .faq-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-faq .faq-filter-panel,
.page-faq .faq-index {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-float);
}

.page-faq .faq-filter-title,
.page-faq .faq-index-title {
  display: block;
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-charcoal);
  margin-bottom: 0.9rem;
}

.page-faq .faq-filter-options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-faq .faq-filter-label {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-charcoal);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.page-faq .faq-filter-label:hover {
  border-color: var(--color-accent);
  color: var(--color-ink);
}

.page-faq #faq-all:checked ~ .faq-sidebar .faq-filter-label[for="faq-all"],
.page-faq #faq-access:checked ~ .faq-sidebar .faq-filter-label[for="faq-access"],
.page-faq #faq-version:checked ~ .faq-sidebar .faq-filter-label[for="faq-version"],
.page-faq #faq-data:checked ~ .faq-sidebar .faq-filter-label[for="faq-data"],
.page-faq #faq-contact:checked ~ .faq-sidebar .faq-filter-label[for="faq-contact"] {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-white);
}

.page-faq .faq-index {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-faq .faq-index-link {
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--color-charcoal);
  font-size: 0.9rem;
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.page-faq .faq-index-link:hover {
  background: var(--color-bg);
  color: var(--color-ink);
  transform: translateX(3px);
}

.page-faq .faq-related {
  display: block;
  background: linear-gradient(135deg, rgba(0, 179, 212, 0.08), rgba(125, 77, 154, 0.08)), var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  text-decoration: none;
  color: var(--color-ink);
  box-shadow: var(--shadow-float);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.page-faq .faq-related:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(27, 42, 74, 0.14), 0 0 0 1px rgba(0, 179, 212, 0.12);
}

.page-faq .faq-related-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.page-faq .faq-related-text {
  display: block;
  font-size: 0.95rem;
  line-height: 1.6;
}

.page-faq .faq-list .faq-section {
  display: none;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.page-faq #faq-all:checked ~ .faq-list .faq-section {
  display: block;
}

.page-faq #faq-access:checked ~ .faq-list .faq-section[data-cat="access"],
.page-faq #faq-version:checked ~ .faq-list .faq-section[data-cat="version"],
.page-faq #faq-data:checked ~ .faq-list .faq-section[data-cat="data"],
.page-faq #faq-contact:checked ~ .faq-list .faq-section[data-cat="contact"] {
  display: block;
}

.page-faq .faq-section-head {
  display: grid;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
  padding-left: 1rem;
  border-left: 4px solid var(--color-border);
}

.page-faq .faq-section[data-cat="access"] .faq-section-head {
  border-left-color: var(--color-accent);
}

.page-faq .faq-section[data-cat="version"] .faq-section-head {
  border-left-color: var(--color-warm);
}

.page-faq .faq-section[data-cat="data"] .faq-section-head {
  border-left-color: var(--color-decor);
}

.page-faq .faq-section[data-cat="contact"] .faq-section-head {
  border-left-color: var(--color-alert);
}

.page-faq .faq-sec-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-charcoal);
}

.page-faq .faq-section-head h2 {
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  line-height: 1.1;
  margin: 0;
  color: var(--color-ink);
}

.page-faq .faq-sec-desc {
  color: var(--color-charcoal);
  line-height: 1.6;
  margin-top: 0.25rem;
  max-width: 48em;
}

.page-faq .faq-figure {
  margin: 0 0 1.5rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-float);
}

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

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

.page-faq .faq-caption {
  padding: 0.75rem 1rem;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--color-charcoal);
  border-top: 1px solid var(--color-border);
}

.page-faq .faq-item {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-left-width: 4px;
  border-radius: var(--radius-md);
  margin-bottom: 0.85rem;
  overflow: hidden;
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.page-faq .faq-section[data-cat="access"] .faq-item {
  border-left-color: var(--color-accent);
}

.page-faq .faq-section[data-cat="version"] .faq-item {
  border-left-color: var(--color-warm);
}

.page-faq .faq-section[data-cat="data"] .faq-item {
  border-left-color: var(--color-decor);
}

.page-faq .faq-section[data-cat="contact"] .faq-item {
  border-left-color: var(--color-alert);
}

.page-faq .faq-item:hover {
  box-shadow: var(--shadow-float);
}

.page-faq .faq-item summary {
  list-style: none;
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr) 1.75rem;
  gap: 0.75rem 0.9rem;
  align-items: center;
  padding: 1.05rem 1.1rem;
  cursor: pointer;
  outline: none;
}

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

.page-faq .faq-item summary:focus-visible {
  box-shadow: inset 0 0 0 2px var(--color-accent);
}

.page-faq .faq-qnum {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1;
  color: var(--color-charcoal);
  opacity: 0.85;
}

.page-faq .faq-qtext {
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--color-ink);
}

.page-faq .faq-icon {
  position: relative;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  display: block;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.page-faq .faq-icon::before,
.page-faq .faq-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0.7rem;
  height: 2px;
  border-radius: 2px;
  background: var(--color-ink);
  transform: translate(-50%, -50%);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.page-faq .faq-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-faq .faq-item[open] .faq-icon::before {
  transform: translate(-50%, -50%) rotate(45deg);
}

.page-faq .faq-item[open] .faq-icon::after {
  transform: translate(-50%, -50%) rotate(135deg);
}

.page-faq .faq-item[open] .faq-icon {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.page-faq .faq-item[open] .faq-icon::before,
.page-faq .faq-item[open] .faq-icon::after {
  background: var(--color-white);
}

.page-faq .faq-a {
  padding: 0 1.1rem 1.35rem;
  border-top: 1px dashed var(--color-border);
  margin-top: 0;
  color: var(--color-charcoal);
  font-size: 0.965rem;
  line-height: 1.75;
}

.page-faq .faq-a-list {
  margin: 0.5rem 0 1rem;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.4rem;
}

.page-faq .faq-a-list li::marker {
  color: var(--color-accent);
}

.page-faq .faq-step-list {
  margin: 0.5rem 0 1rem;
  padding-left: 1.4rem;
  display: grid;
  gap: 0.5rem;
}

.page-faq .faq-step-list li::marker {
  color: var(--color-warm);
  font-weight: 700;
}

.page-faq .faq-inline-link {
  color: var(--color-accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(0, 179, 212, 0.4);
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

.page-faq .faq-inline-link:hover {
  color: var(--color-ink);
  text-decoration-color: var(--color-ink);
}

.page-faq .faq-contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.page-faq .faq-contact-card {
  display: grid;
  gap: 0.35rem;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.25rem;
}

.page-faq .faq-section[data-cat="contact"] .faq-contact-card {
  border-left: 4px solid var(--color-alert);
}

.page-faq .faq-contact-label {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-charcoal);
}

.page-faq .faq-contact-value {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-ink);
  word-break: break-word;
}

@media (min-width: 640px) {
  .page-faq .faq-contact-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .page-faq .faq-lead {
    margin-left: clamp(3rem, 12vw, 9rem);
    border-left: 3px solid var(--color-border);
    padding-left: 1.5rem;
  }

  .page-faq .faq-item summary {
    grid-template-columns: 3rem minmax(0, 1fr) 2rem;
    padding: 1.15rem 1.5rem;
  }

  .page-faq .faq-qnum {
    font-size: 1.5rem;
  }

  .page-faq .faq-icon {
    width: 2rem;
    height: 2rem;
  }

  .page-faq .faq-a {
    padding-left: 5.25rem;
    padding-right: 2.5rem;
  }

  .page-faq .faq-a-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    list-style: none;
    padding-left: 0;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: 280px minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-faq .faq-sidebar {
    position: sticky;
    top: calc(var(--ticker-h) + var(--nav-h) + 1rem);
  }

  .page-faq .faq-filter-options {
    flex-direction: column;
  }

  .page-faq .faq-filter-label {
    width: 100%;
  }
}