.faq-hero {
  overflow: hidden;
  background:
    radial-gradient(760px 480px at 88% 12%, var(--color-accent-a28), var(--color-transparent) 66%),
    radial-gradient(820px 540px at 8% 100%, var(--color-accent-dark-a34), var(--color-transparent) 68%),
    linear-gradient(145deg, var(--color-night), var(--color-panel));
}

.faq-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--color-muted-a09) 1px, var(--color-transparent) 1px),
    linear-gradient(90deg, var(--color-muted-a09) 1px, var(--color-transparent) 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(90deg, var(--color-transparent), var(--color-night), var(--color-transparent));
}

.faq-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  align-items: center;
  gap: 72px;
}

.faq-hero-copy {
  min-width: 0;
}

.faq-hero h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(36px, 4vw, 48px);
  line-height: 1.08;
}

.faq-title-mark {
  border-bottom: 5px solid var(--color-lime);
  padding-bottom: 2px;
}

.faq-hero-description {
  max-width: 720px;
  margin-bottom: 28px;
  color: var(--color-text-muted);
  font-size: 17px;
  line-height: 1.9;
}

.faq-hero-actions,
.faq-next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.faq-order-card {
  position: relative;
  min-width: 0;
  padding: 28px;
  color: var(--color-text);
  background: linear-gradient(150deg, var(--color-panel-a96), var(--color-panel-raised));
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-deep), var(--shadow-glow);
}

.faq-order-card::before {
  content: '';
  position: absolute;
  top: -1px;
  right: 26px;
  left: 26px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-cyan));
  border-radius: var(--radius-pill);
}

.faq-order-label {
  margin-bottom: 18px;
  color: var(--color-cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.faq-order-list {
  display: grid;
  gap: 0;
  list-style: none;
}

.faq-order-list li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: center;
  gap: 13px;
  padding-top: 15px;
  padding-bottom: 15px;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border-a60);
}

.faq-order-list li:last-child {
  border-bottom: 0;
}

.faq-order-list span {
  color: var(--color-lime);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
}

.faq-index {
  padding-bottom: 54px;
}

.faq-index-intro {
  max-width: 760px;
  color: var(--color-ink-muted);
}

.faq-index .toc {
  margin-top: 28px;
}

.faq-reading-note {
  padding: 18px 20px;
  color: var(--color-ink-muted);
  background: var(--color-panel-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.faq-reading-note strong {
  color: var(--color-code-key);
}

.faq-category {
  scroll-margin-top: calc(var(--header-height) + 16px);
  padding-top: 66px;
  padding-bottom: 66px;
}

.faq-category-tinted {
  background:
    linear-gradient(135deg, var(--color-accent-a10), var(--color-transparent) 48%),
    var(--color-surface-pure);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.faq-category-layout {
  display: grid;
  grid-template-columns: minmax(250px, 0.62fr) minmax(0, 1.38fr);
  align-items: start;
  gap: 64px;
}

.faq-category-head {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 17px;
  min-width: 0;
}

.faq-category-number {
  display: grid;
  width: 54px;
  height: 42px;
  place-items: center;
  color: var(--color-night);
  background: var(--color-lime);
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 22px var(--color-lime-a22);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
}

.faq-category-head h2 {
  margin-bottom: 12px;
}

.faq-category-head p:last-child {
  margin-bottom: 0;
  color: var(--color-ink-muted);
}

.faq-category .faq-list {
  min-width: 0;
}

.faq-category .faq-item {
  box-shadow: 0 10px 28px var(--color-shadow-a18);
  transition: border-color var(--ease-standard), transform var(--ease-standard), box-shadow var(--ease-standard);
}

.faq-category .faq-item:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 16px 34px var(--color-shadow-a18);
}

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

.faq-category .faq-item[open] summary {
  color: var(--color-code-key);
}

.faq-category .faq-answer p {
  margin-bottom: 0;
}

.faq-category-dark {
  color: var(--color-text);
  background:
    radial-gradient(720px 460px at 100% 0%, var(--color-accent-a20), var(--color-transparent) 68%),
    var(--color-night);
}

.faq-category-dark h2 {
  color: var(--color-text);
}

.faq-category-dark .faq-category-head p:last-child {
  color: var(--color-text-muted);
}

.faq-category-dark .faq-item {
  background: var(--color-panel);
  border-color: var(--color-border);
  box-shadow: 0 16px 38px var(--color-shadow-a50);
}

.faq-category-dark .faq-item:hover,
.faq-category-dark .faq-item[open] {
  border-color: var(--color-cyan);
}

.faq-category-dark .faq-item summary {
  color: var(--color-text);
}

.faq-category-dark .faq-item summary::after {
  color: var(--color-lime);
}

.faq-category-dark .faq-item[open] summary {
  color: var(--color-cyan);
}

.faq-category-dark .faq-answer {
  color: var(--color-text-muted);
}

.faq-next {
  background:
    linear-gradient(120deg, var(--color-accent-a10), var(--color-transparent) 52%),
    var(--color-surface);
}

.faq-next-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 42px;
  padding: 34px;
  background: var(--color-surface-pure);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}

.faq-next-panel h2 {
  margin-bottom: 12px;
}

.faq-next-panel p:last-child {
  max-width: 760px;
  margin-bottom: 0;
  color: var(--color-ink-muted);
}

@media (max-width: 980px) {
  .faq-hero-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 44px;
  }

  .faq-order-card {
    max-width: 680px;
  }

  .faq-category-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
  }

  .faq-category-head {
    position: static;
  }

  .faq-next-panel {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .faq-hero h1 {
    font-size: clamp(24px, 7vw, 30px);
  }

  .faq-hero-description {
    font-size: 15px;
  }

  .faq-title-mark {
    border-bottom-width: 4px;
  }

  .faq-order-card {
    padding: 21px;
  }

  .faq-order-list li {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px;
  }

  .faq-category {
    padding-top: 54px;
    padding-bottom: 54px;
  }

  .faq-category-head {
    grid-template-columns: minmax(0, 1fr);
  }

  .faq-category-number {
    width: 48px;
    height: 38px;
  }

  .faq-next-panel {
    padding: 22px;
  }

  .faq-next-actions .button,
  .faq-hero-actions .button {
    width: 100%;
  }
}