.page-faq,
.page-faq *,
.page-faq *::before,
.page-faq *::after {
  box-sizing: border-box;
}

.page-faq {
  --faq-cut: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  --faq-grad-line: linear-gradient(90deg, var(--c-accent), var(--c-primary-light), var(--c-warning));
  background: var(--c-gray);
}

/* ===== Hero 首屏 ===== */
.page-faq .faq-hero {
  position: relative;
  background: var(--grad-primary);
  overflow: hidden;
  padding: calc(var(--gutter) + 24px) var(--gutter) 96px;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(244, 242, 238, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244, 242, 238, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 40px;
  background: var(--faq-grad-line);
  clip-path: polygon(0 100%, 0 50%, 100% 0, 100% 100%);
  opacity: 0.8;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.page-faq .faq-hero__content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.page-faq .faq-hero__tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.24em;
  color: var(--c-accent);
  text-transform: uppercase;
  border-bottom: 2px solid rgba(163, 255, 18, 0.6);
  padding-bottom: 10px;
  margin-bottom: 20px;
}

.page-faq .faq-hero__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 2.6rem;
  line-height: 1.08;
  color: var(--c-white);
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.page-faq .faq-hero__sub {
  display: block;
  margin-top: 10px;
  font-size: 0.42em;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--c-beige);
  opacity: 0.9;
  text-transform: none;
}

.page-faq .faq-hero__desc {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(244, 242, 238, 0.16);
  width: 100%;
}

.page-faq .faq-hero__stats span {
  font-size: 0.85rem;
  color: var(--c-muted);
}

.page-faq .faq-hero__stats strong {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-accent);
  margin-right: 4px;
}

.page-faq .faq-hero__jumps {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-faq .faq-pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border: 1px solid rgba(244, 242, 238, 0.35);
  color: var(--c-white);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.88rem;
  text-decoration: none;
  clip-path: var(--faq-cut);
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.page-faq .faq-pill:hover,
.page-faq .faq-pill:focus-visible {
  background: var(--c-accent);
  color: var(--c-dark);
  border-color: var(--c-accent);
}

.page-faq .faq-hero__figure {
  margin: 0;
  order: 2;
  clip-path: var(--faq-cut);
  box-shadow: var(--shadow-neon);
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
}

/* ===== 主体区域 ===== */
.page-faq .faq-main {
  background:
    linear-gradient(135deg, rgba(163, 255, 18, 0.03) 0%, transparent 50%),
    repeating-linear-gradient(-45deg, rgba(244, 242, 238, 0.02) 0 1px, transparent 1px 16px),
    var(--c-gray);
  padding: var(--gutter);
}

.page-faq .faq-main__inner {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  gap: 48px;
  padding: 48px 0 96px;
}

/* ===== 侧边栏分类 ===== */
.page-faq .faq-sidebar__sticky {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.page-faq .faq-sidebar__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--c-accent);
  padding-left: 14px;
  border-left: 3px solid var(--c-accent);
}

.page-faq .faq-sidebar__nav {
  display: grid;
  gap: 8px;
}

.page-faq .faq-sidebar__nav a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  text-decoration: none;
  background: rgba(18, 16, 31, 0.5);
  border-left: 3px solid transparent;
  color: var(--c-white);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.page-faq .faq-sidebar__nav a:hover,
.page-faq .faq-sidebar__nav a:focus-visible {
  background: rgba(18, 16, 31, 0.85);
  border-left-color: var(--c-accent);
}

.page-faq .faq-sidebar__no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-terracotta);
}

.page-faq .faq-sidebar__figure {
  margin: 16px 0 0;
  clip-path: var(--faq-cut);
}

.page-faq .faq-sidebar__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-faq .faq-sidebar__figure figcaption {
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--c-muted);
  line-height: 1.6;
}

/* ===== FAQ 区块 ===== */
.page-faq .faq-sections {
  display: grid;
  gap: 56px;
  min-width: 0;
}

.page-faq .faq-block {
  position: relative;
  padding-top: 30px;
  border-top: 1px solid rgba(184, 185, 196, 0.22);
}

.page-faq .faq-block::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--c-primary-light);
}

.page-faq .faq-block--download::before { background: var(--c-accent); }
.page-faq .faq-block--device::before { background: var(--c-primary-light); }
.page-faq .faq-block--version::before { background: var(--c-warning); }
.page-faq .faq-block--data::before { background: var(--c-moss); }
.page-faq .faq-block--archive::before { background: var(--c-terracotta); }
.page-faq .faq-block--contact::before { background: var(--c-neon-pink); }

.page-faq .faq-block__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
}

.page-faq .faq-block__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--c-terracotta);
}

.page-faq .faq-block__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.7rem;
  line-height: 1.2;
  color: var(--c-white);
}

/* ===== 手风琴 ===== */
.page-faq .faq-item {
  margin-bottom: 10px;
  background: rgba(18, 16, 31, 0.52);
  border-left: 3px solid transparent;
  transition: border-color var(--transition-med);
}

.page-faq .faq-block--download .faq-item:hover { border-left-color: var(--c-accent); }
.page-faq .faq-block--device .faq-item:hover { border-left-color: var(--c-primary-light); }
.page-faq .faq-block--version .faq-item:hover { border-left-color: var(--c-warning); }
.page-faq .faq-block--data .faq-item:hover { border-left-color: var(--c-moss); }
.page-faq .faq-block--archive .faq-item:hover { border-left-color: var(--c-terracotta); }
.page-faq .faq-block--contact .faq-item:hover { border-left-color: var(--c-neon-pink); }

.page-faq .faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  list-style: none;
  cursor: pointer;
  padding: 18px 20px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.05rem;
  line-height: 1.5;
  color: var(--c-white);
  transition: color var(--transition-fast);
}

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

.page-faq .faq-item summary:hover {
  color: var(--c-accent);
}

.page-faq .faq-item summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 400;
  line-height: 1;
  color: var(--c-terracotta);
  transition: transform var(--transition-med), color var(--transition-med);
}

.page-faq .faq-item[open] summary::after {
  transform: rotate(45deg);
  color: var(--c-accent);
}

.page-faq .faq-item__a {
  padding: 4px 20px 20px;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-faq .faq-item__a p {
  margin: 0;
}

.page-faq .faq-item[open] .faq-item__a {
  animation: page-faq-in var(--transition-med) ease both;
}

.page-faq .faq-item__a a {
  color: var(--c-accent);
  text-decoration: underline;
  text-decoration-color: rgba(163, 255, 18, 0.4);
  text-underline-offset: 3px;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

.page-faq .faq-item__a a:hover,
.page-faq .faq-item__a a:focus-visible {
  color: var(--c-white);
  text-decoration-color: var(--c-white);
}

@keyframes page-faq-in {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ===== 联系 CTA ===== */
.page-faq .faq-block__cta {
  margin-top: 28px;
  padding: 22px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 1px solid rgba(163, 255, 18, 0.35);
  background: linear-gradient(135deg, rgba(163, 255, 18, 0.09), transparent 60%);
  clip-path: var(--faq-cut);
}

.page-faq .faq-block__cta p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--c-white);
}

/* ===== 响应式增强 ===== */
@media (min-width: 640px) {
  .page-faq .faq-hero__title {
    font-size: 3.4rem;
  }

  .page-faq .faq-block__title {
    font-size: 1.9rem;
  }

  .page-faq .faq-main__inner {
    gap: 40px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding-top: calc(var(--gutter) + 64px);
    padding-bottom: 120px;
  }

  .page-faq .faq-hero__inner {
    display: grid;
    grid-template-columns: 1fr 1.15fr;
    align-items: center;
    gap: 48px;
  }

  .page-faq .faq-hero__figure {
    order: initial;
  }

  .page-faq .faq-hero__title {
    font-size: 4.1rem;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-main__inner {
    grid-template-columns: 280px 1fr;
    gap: 64px;
    align-items: start;
  }

  .page-faq .faq-sidebar__sticky {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-faq .faq-hero__title {
    font-size: 4.8rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] .faq-item__a {
    animation: none;
  }

  .page-faq .faq-item summary::after {
    transition: none;
  }
}