/* ===== 页面作用域变量 ===== */
.page-faq {
  --faq-gap: clamp(3.25rem, 7vw, 5.5rem);
  --section-c: var(--color-neon);
  --section-c-soft: rgba(200, 255, 0, 0.08);
  color: var(--color-text);
  padding-bottom: 1.5rem;
}

/* ===== 面包屑 ===== */
.page-faq__crumb {
  padding-top: 1.5rem;
}
.page-faq__crumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-dim);
}
.page-faq__crumb a {
  color: var(--color-text-dim);
  text-decoration: none;
  transition: color 0.3s var(--ease);
}
.page-faq__crumb a:hover {
  color: var(--color-neon);
}
.page-faq__crumb li + li::before {
  content: "/";
  margin-right: 0.4rem;
  color: var(--color-border);
}

/* ===== 首屏帮助中心 ===== */
.page-faq__hero {
  position: relative;
  padding: clamp(2.5rem, 5vw, 4.5rem) 0 2rem;
  overflow: hidden;
}
.page-faq__hero::before {
  content: "";
  position: absolute;
  inset: 0 0 0 52%;
  background: repeating-linear-gradient(
    135deg,
    transparent 0 6px,
    var(--color-border) 6px 12px
  );
  opacity: 0.25;
  clip-path: polygon(18% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}
.page-faq__hero::after {
  content: "";
  position: absolute;
  width: 200px;
  height: 200px;
  right: -70px;
  top: 10px;
  border: 2px dashed var(--color-red);
  border-radius: 50%;
  opacity: 0.3;
  pointer-events: none;
}
.page-faq__hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}
.page-faq__hero-copy .chapter-label {
  display: inline-block;
  margin-bottom: 1rem;
}
.page-faq__hero-copy h1 {
  margin: 0 0 1rem;
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 4vw, 2.9rem);
  font-weight: 900;
  font-style: italic;
  line-height: 1.15;
  color: var(--color-text);
  max-width: 12em;
}
.page-faq__hero-copy .lead {
  max-width: 42em;
  margin: 0 0 1.4rem;
  color: var(--color-text-dim);
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: 1.7;
}
.page-faq__hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.page-faq__hero-icon {
  display: none;
}

/* ===== 主题快速导航 ===== */
.page-faq__index {
  padding: 2.5rem 0 0.5rem;
  position: relative;
  z-index: 2;
}
.page-faq__index-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  border: 1px solid var(--color-border);
  background: var(--color-bg-2);
  padding: 0.75rem;
  margin: 0;
}
.page-faq__index-link {
  --link-c: var(--color-border);
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1rem 1.1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  text-decoration: none;
  overflow: hidden;
  transition: transform 0.3s var(--ease), background 0.3s var(--ease), border-color 0.3s var(--ease);
}
.page-faq__index-link::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--link-c);
  transition: width 0.3s var(--ease);
}
.page-faq__index-link:hover {
  transform: translateY(-3px);
  background: var(--color-bg-2);
}
.page-faq__index-link:hover::after {
  width: 9px;
}
.page-faq__index-link--install {
  --link-c: var(--color-neon);
}
.page-faq__index-link--sync {
  --link-c: var(--color-blue);
}
.page-faq__index-link--update {
  --link-c: var(--color-gold);
}
.page-faq__index-link--tablet {
  --link-c: var(--color-red);
}
.page-faq__index-num {
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  background: var(--link-c);
  color: var(--color-bg);
  border-radius: 50%;
}
.page-faq__index-name {
  flex: 1;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text);
}
.page-faq__index-mark {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-text-dim);
  transition: transform 0.3s var(--ease), color 0.3s var(--ease);
}
.page-faq__index-link:hover .page-faq__index-mark {
  transform: translate(3px, 3px);
  color: var(--link-c);
}

/* ===== 各章节公共 ===== */
.page-faq__section {
  position: relative;
  padding-top: var(--faq-gap);
  scroll-margin-top: 80px;
}
.page-faq__section + .page-faq__section {
  border-top: 1px solid var(--color-border);
  margin-top: var(--faq-gap);
}
.page-faq__section-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem 2.5rem;
  align-items: start;
}

/* 章节主题色 */
.page-faq__section--install {
  --section-c: var(--color-neon);
  --section-c-soft: rgba(200, 255, 0, 0.08);
}
.page-faq__section--sync {
  --section-c: var(--color-blue);
  --section-c-soft: rgba(41, 208, 255, 0.08);
}
.page-faq__section--update {
  --section-c: var(--color-gold);
  --section-c-soft: rgba(255, 200, 92, 0.08);
}
.page-faq__section--tablet {
  --section-c: var(--color-red);
  --section-c-soft: rgba(255, 78, 54, 0.08);
}

/* ===== 章节侧栏 ===== */
.page-faq__aside {
  position: relative;
}
.page-faq__section-idx {
  position: absolute;
  top: -1rem;
  right: 0.25rem;
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 900;
  font-size: 4.8rem;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--section-c);
  opacity: 0.4;
  pointer-events: none;
  z-index: 0;
}
.page-faq__aside .chapter-label {
  position: relative;
  z-index: 1;
  display: inline-block;
  margin-bottom: 0.7rem;
}
.page-faq__aside .section-title {
  position: relative;
  z-index: 1;
  margin: 0 0 1rem;
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 900;
  font-style: italic;
  line-height: 1.2;
  color: var(--color-text);
  max-width: 7em;
}
.page-faq__aside .section-title__accent {
  color: var(--section-c);
}
.page-faq__aside-desc {
  color: var(--color-text-dim);
  line-height: 1.7;
  font-size: 0.95rem;
  margin: 0 0 1.2rem;
  max-width: 26em;
}
.page-faq__aside .btn {
  pointer-events: auto;
}

/* ===== 折叠问答 ===== */
.page-faq__qa {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}
.page-faq__item {
  border: 1px solid var(--color-border);
  border-left-width: 5px;
  border-left-color: var(--section-c);
  background: var(--color-surface);
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.page-faq__item[open] {
  background: var(--color-bg-2);
  border-left-width: 8px;
}
.page-faq__q {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.2rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text);
  transition: color 0.3s var(--ease);
}
.page-faq__q::-webkit-details-marker {
  display: none;
}
.page-faq__q:hover {
  color: var(--section-c);
}
.page-faq__q:focus-visible,
.page-faq__index-link:focus-visible {
  outline: 2px solid var(--section-c, var(--color-neon));
  outline-offset: 2px;
}
.page-faq__qnum {
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--section-c);
  color: var(--color-bg);
  transition: transform 0.3s var(--ease);
}
.page-faq__q:hover .page-faq__qnum {
  transform: scale(1.08);
}
.page-faq__qtext {
  flex: 1;
  min-width: 0;
}
.page-faq__toggle {
  position: relative;
  width: 20px;
  height: 20px;
  flex: 0 0 20px;
}
.page-faq__toggle::before,
.page-faq__toggle::after {
  content: "";
  position: absolute;
  background: var(--section-c);
  transition: transform 0.3s var(--ease), background 0.3s var(--ease);
}
.page-faq__toggle::before {
  left: 0;
  right: 0;
  top: 9px;
  height: 2px;
}
.page-faq__toggle::after {
  left: 9px;
  top: 0;
  bottom: 0;
  width: 2px;
}
.page-faq__item[open] .page-faq__toggle::after {
  transform: scaleY(0);
}

/* ===== 展开答案 ===== */
.page-faq__a {
  display: none;
  padding: 0 1.2rem 1.15rem 3.35rem;
}
.page-faq__item[open] .page-faq__a {
  display: block;
  animation: pageFaqFade 0.35s var(--ease);
}
.page-faq__a p {
  margin: 0.9rem 0 0;
  line-height: 1.75;
  color: var(--color-text-dim);
  font-size: 0.92rem;
  border-top: 1px dashed var(--color-border);
  padding-top: 0.9rem;
}
.page-faq__a strong {
  color: var(--color-text);
}

@keyframes pageFaqFade {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 跨设备同步示意图 ===== */
.page-faq__sync {
  margin: 0.4rem 0 0;
  padding: 1rem;
  border: 1px dashed var(--section-c);
  background: var(--section-c-soft);
}
.page-faq__sync img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--color-border);
}
.page-faq__sync .caption {
  margin-top: 0.75rem;
  font-size: 0.78rem;
}

/* ===== 底部联系引导 ===== */
.page-faq__cta {
  margin-top: var(--faq-gap);
  padding-bottom: 3.5rem;
}
.page-faq__cta-card {
  position: relative;
  border: 1px solid var(--color-border);
  background: linear-gradient(135deg, var(--color-bg-2) 0%, var(--color-surface) 60%);
  padding: clamp(1.8rem, 4vw, 3rem);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
  overflow: hidden;
}
.page-faq__cta-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: linear-gradient(180deg, var(--color-neon), var(--color-blue), var(--color-gold), var(--color-red));
}
.page-faq__cta-card h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-style: italic;
  font-weight: 900;
  color: var(--color-text);
}
.page-faq__cta-card p {
  color: var(--color-text-dim);
  margin: 0;
  line-height: 1.7;
  max-width: 34em;
}

/* ===== 首屏图标 ===== */
.page-faq__help-img {
  width: 120px;
  height: 120px;
  display: block;
  border-radius: 50%;
  border: 2px solid var(--color-red);
  object-fit: cover;
  transform: rotate(3deg);
  box-shadow: 8px 8px 0 var(--color-border), 12px 12px 0 rgba(255, 78, 54, 0.12);
}

/* ===== 响应式断点 ===== */
@media (min-width: 640px) {
  .page-faq__index-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-faq__index-link {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.8rem;
    padding: 1.3rem 1.2rem 1.2rem;
  }
  .page-faq__index-name {
    font-size: 1rem;
  }
}

@media (min-width: 768px) {
  .page-faq__hero-grid {
    grid-template-columns: 1fr auto;
    gap: 3rem;
  }
  .page-faq__hero-icon {
    display: block;
    align-self: center;
    padding-right: 1.5rem;
  }
  .page-faq__hero::before {
    left: 58%;
  }
  .page-faq__section-idx {
    font-size: 6rem;
  }
}

@media (min-width: 900px) {
  .page-faq__section-grid {
    grid-template-columns: repeat(12, 1fr);
  }
  .page-faq__section-grid > [data-col="4"] {
    grid-column: span 4;
  }
  .page-faq__section-grid > [data-col="8"] {
    grid-column: span 8;
  }
}

@media (min-width: 1024px) {
  .page-faq__index-list {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-faq__qa {
    padding-top: 0.5rem;
  }
  .page-faq__aside-desc {
    font-size: 1rem;
  }
}