.faq-hero {
  position: relative;
  overflow-x: clip;
  background:
    radial-gradient(circle at 82% 18%, var(--color-pink-soft), transparent 28%),
    radial-gradient(circle at 68% 78%, var(--color-blue-soft), transparent 32%),
    var(--color-page);
  color: var(--color-ink);
  padding-top: clamp(54px, 7vw, 86px);
  padding-bottom: clamp(64px, 8vw, 96px);
}

.faq-hero::after {
  position: absolute;
  right: 7%;
  bottom: 8%;
  width: 120px;
  height: 120px;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-large);
  content: "";
  pointer-events: none;
  transform: rotate(12deg);
}

.faq-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  align-items: center;
  gap: clamp(32px, 6vw, 82px);
}

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

.faq-hero-copy .subtitle {
  margin-bottom: 1.6rem;
}

.faq-route-panel {
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  color: var(--color-ink);
  box-shadow: var(--shadow-device);
  padding: clamp(22px, 4vw, 34px);
}

.faq-route-label,
.faq-category-code {
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.faq-route-label {
  margin-bottom: 1rem;
}

.faq-route {
  margin: 0;
  padding: 0;
  list-style: none;
}

.faq-route li {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 16px;
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.faq-route li:last-child {
  padding-bottom: 0;
}

.faq-route-index {
  display: grid;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  place-items: center;
  border-radius: var(--radius-small);
  background: var(--color-pink-soft);
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
}

.faq-route li:nth-child(2) .faq-route-index {
  background: var(--color-blue-soft);
  color: var(--color-cyan-deep);
}

.faq-route li:nth-child(3) .faq-route-index {
  background: var(--color-orange-soft);
  color: var(--color-warning);
}

.faq-route strong,
.faq-route span {
  display: block;
}

.faq-route strong {
  font-size: 0.95rem;
}

.faq-route li div > span {
  color: var(--color-muted);
  font-size: 0.82rem;
}

.faq-nav-section {
  background: var(--color-surface);
  color: var(--color-ink);
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
}

.faq-category-nav {
  margin-bottom: 28px;
}

.faq-category-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.faq-category-card {
  display: flex;
  min-width: 0;
  min-height: 168px;
  flex-direction: column;
  justify-content: flex-end;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  color: var(--color-ink);
  padding: 22px;
  text-decoration: none;
  transition: border-color var(--speed-normal), box-shadow var(--speed-normal), transform var(--speed-normal);
}

.faq-category-card:hover {
  border-color: var(--color-accent);
  color: var(--color-ink);
  box-shadow: var(--shadow-raised);
  transform: translateY(-3px);
}

.faq-category-card strong,
.faq-category-card > span {
  display: block;
}

.faq-category-card strong {
  margin-top: auto;
  font-family: var(--font-display);
  font-size: 1.12rem;
}

.faq-category-card > span:last-child {
  margin-top: 0.35rem;
  color: var(--color-muted);
  font-size: 0.85rem;
}

.faq-group-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(280px, 0.55fr);
  align-items: end;
  gap: 28px;
  margin-bottom: clamp(28px, 5vw, 48px);
}

.faq-group-heading h2,
.faq-group-heading p {
  margin-bottom: 0;
}

.faq-group-heading > p {
  color: var(--color-muted);
}

#basics,
#installation,
#usage,
#troubleshooting {
  scroll-margin-top: 84px;
}

.faq-list-surface {
  border-right: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
  padding-right: clamp(18px, 4vw, 34px);
  padding-left: clamp(18px, 4vw, 34px);
}

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

.faq-note {
  margin-top: 28px;
}

.diagnostic-strip {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-border);
  color: var(--color-ink);
  margin-bottom: 28px;
}

.diagnostic-strip span {
  position: relative;
  min-width: 0;
  background: var(--color-surface);
  color: var(--color-ink-soft);
  padding: 0.85rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-align: center;
}

.diagnostic-strip span:nth-child(2) {
  background: var(--color-blue-soft);
}

.diagnostic-strip span:nth-child(3) {
  background: var(--color-pink-soft);
}

.diagnostic-strip span:nth-child(4) {
  background: var(--color-orange-soft);
}

.faq-followup {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-pink-soft);
  color: var(--color-ink);
  margin-top: clamp(34px, 6vw, 62px);
  padding: clamp(24px, 5vw, 42px);
}

.faq-followup h2 {
  margin-bottom: 0.65rem;
}

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

@media (max-width: 900px) {
  .faq-hero-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .faq-route-panel {
    max-width: 680px;
  }

  .faq-category-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .faq-group-heading {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }
}

@media (max-width: 640px) {
  .faq-hero {
    padding-top: 42px;
    padding-bottom: 64px;
  }

  .faq-hero::after {
    display: none;
  }

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

  .faq-category-card {
    min-height: 138px;
  }

  .diagnostic-strip {
    grid-template-columns: minmax(0, 1fr);
  }

  .diagnostic-strip span {
    text-align: left;
  }

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

  .faq-followup .button {
    width: 100%;
  }
}