.page-faq {
  --faq-toc-w: 272px;
  --faq-accent: var(--cyan);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 7vw, 88px) 0 clamp(36px, 5vw, 68px);
  background:
    radial-gradient(110% 80% at 8% 0%, rgba(108, 76, 255, 0.3), transparent 62%),
    radial-gradient(70% 60% at 100% 4%, rgba(34, 243, 228, 0.14), transparent 60%),
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(152, 163, 198, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(152, 163, 198, 0.07) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(82% 72% at 46% 18%, #000 0%, transparent 78%);
  mask-image: radial-gradient(82% 72% at 46% 18%, #000 0%, transparent 78%);
}

.page-faq .faq-hero__inner {
  position: relative;
  display: grid;
  gap: 34px;
  align-items: center;
}

.page-faq .faq-hero .crumbs {
  margin-bottom: 18px;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(34px, 6.6vw, 68px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-faq .faq-hero h1 em {
  display: block;
  font-style: normal;
  color: var(--cyan);
  text-shadow: var(--glow-cyan);
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 54ch;
  color: var(--mist);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
}

.page-faq .faq-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 26px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-stats li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 12px;
  border-left: 2px solid var(--line-strong);
}

.page-faq .faq-stats__n {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 600;
  color: var(--ice);
}

.page-faq .faq-stats__l {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-faq .faq-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-faq .faq-hero__media {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--line-strong);
  background: var(--ink-700);
  box-shadow: var(--shadow-card);
  transform: rotate(-1.2deg);
}

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

.page-faq .faq-hero__cap {
  margin: 10px 2px 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 主体框架 ---------- */
.page-faq .faq-body {
  padding: clamp(40px, 6vw, 84px) 0 clamp(56px, 8vw, 104px);
  background:
    radial-gradient(90% 60% at 100% 0%, rgba(255, 46, 136, 0.08), transparent 62%),
    var(--ink-900);
}

.page-faq .faq-layout {
  display: grid;
  gap: 36px;
}

/* ---------- 左栏目录 ---------- */
.page-faq .faq-toc {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(20, 26, 69, 0.92), rgba(10, 14, 42, 0.92));
  box-shadow: var(--shadow-card);
  padding: 18px 16px;
}

.page-faq .faq-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-faq .faq-toc__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-toc__link {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  padding: 9px 10px;
  border-left: 2px solid transparent;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.22s ease, border-color 0.22s ease, background-color 0.22s ease;
}

.page-faq .faq-toc__link:hover {
  color: var(--ice);
  border-left-color: var(--amber);
  background: rgba(255, 176, 32, 0.07);
}

.page-faq .faq-toc__link[aria-current] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(34, 243, 228, 0.09);
}

.page-faq .faq-toc__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--violet);
  letter-spacing: 0.06em;
}

.page-faq .faq-toc__link[aria-current] .faq-toc__num {
  color: var(--cyan);
}

.page-faq .faq-toc__txt {
  min-width: 0;
}

.page-faq .faq-toc__side {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-strong);
}

.page-faq .faq-toc__side a {
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-toc__side a:hover {
  color: var(--ice);
  border-bottom-color: var(--cyan);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  padding-top: clamp(30px, 4.4vw, 52px);
  scroll-margin-top: 136px;
}

.page-faq .faq-group:first-child {
  padding-top: 0;
}

.page-faq .faq-group--search { --faq-accent: var(--cyan); }
.page-faq .faq-group--compare { --faq-accent: var(--magenta); }
.page-faq .faq-group--download { --faq-accent: var(--amber); }
.page-faq .faq-group--screen { --faq-accent: var(--violet); }
.page-faq .faq-group--device { --faq-accent: var(--green); }
.page-faq .faq-group--help { --faq-accent: var(--cyan); }

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--violet);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-faq .faq-group__title::after {
  content: "";
  display: block;
  width: 52px;
  height: 2px;
  margin-top: 10px;
  background: var(--faq-accent);
  box-shadow: 0 0 12px var(--faq-accent);
}

.page-faq .faq-group__note {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--mist);
}

/* ---------- 问答卡 ---------- */
.page-faq .qa {
  position: relative;
  margin: 0 0 12px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--faq-accent);
  background: linear-gradient(180deg, rgba(20, 26, 69, 0.74), rgba(10, 14, 42, 0.74));
  box-shadow: var(--shadow-card);
  transition: transform 0.24s ease, border-color 0.24s ease;
}

.page-faq .qa:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  border-left-color: var(--faq-accent);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  color: var(--ice);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.62;
}

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

.page-faq .qa__q::marker {
  content: "";
}

.page-faq .qa__idx {
  flex: none;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--faq-accent);
}

.page-faq .qa__mark {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
  margin-top: 6px;
  margin-left: auto;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--faq-accent);
  border-radius: 2px;
  transition: transform 0.24s ease, opacity 0.24s ease;
}

.page-faq .qa__mark::before {
  top: 7px;
  left: 0;
  width: 16px;
  height: 2px;
}

.page-faq .qa__mark::after {
  top: 0;
  left: 7px;
  width: 2px;
  height: 16px;
}

.page-faq .qa[open] .qa__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .qa__body {
  padding: 0 20px 18px 52px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
  animation: faq-body-in 0.26s ease both;
}

.page-faq .qa__body p {
  margin: 0 0 10px;
}

.page-faq .qa__body p:last-child {
  margin-bottom: 0;
}

.page-faq .qa__go {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
}

.page-faq .qa__go::before {
  content: "→";
  font-family: var(--font-mono);
  color: var(--faq-accent);
}

.page-faq .qa__go a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 243, 228, 0.34);
  transition: border-color 0.2s ease;
}

.page-faq .qa__go a:hover {
  border-bottom-color: var(--cyan);
}

@keyframes faq-body-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 对照示意图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 22px;
  padding: 8px;
  border: 1px solid var(--line);
  background: var(--ink-700);
  box-shadow: var(--shadow-card);
}

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

.page-faq .faq-figure__cap {
  margin: 10px 4px 2px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 联系卡 ---------- */
.page-faq .faq-contact {
  margin: 0 0 20px;
  padding: 20px 22px;
  border: 1px solid rgba(34, 243, 228, 0.28);
  background:
    linear-gradient(135deg, rgba(34, 243, 228, 0.09), rgba(108, 76, 255, 0.12)),
    var(--ink-700);
  box-shadow: var(--shadow-card);
}

.page-faq .faq-contact__t {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-faq .faq-contact__list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-contact__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  align-items: baseline;
  font-size: 14px;
  color: var(--ice);
}

.page-faq .faq-contact__k {
  flex: none;
  min-width: 62px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

/* ---------- 响应式 ---------- */
@media (max-width: 999px) {
  .page-faq .faq-toc__list {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding-bottom: 6px;
  }

  .page-faq .faq-toc__list li {
    flex: 0 0 auto;
    scroll-snap-align: start;
  }

  .page-faq .faq-toc__link {
    grid-template-columns: auto auto;
    gap: 8px;
    border-left: none;
    border-bottom: 2px solid transparent;
    background: rgba(237, 242, 255, 0.04);
    white-space: nowrap;
  }

  .page-faq .faq-toc__link:hover,
  .page-faq .faq-toc__link[aria-current] {
    border-left: none;
    border-bottom-color: var(--cyan);
  }
}

@media (max-width: 620px) {
  .page-faq .faq-hero__media {
    transform: none;
  }

  .page-faq .qa__q {
    padding: 14px 14px;
    font-size: 15.5px;
  }

  .page-faq .qa__body {
    padding: 0 16px 16px 16px;
    font-size: 14.5px;
  }

  .page-faq .faq-group__note {
    margin-left: 0;
  }

  .page-faq .faq-contact {
    padding: 16px 14px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 54px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-toc-w) minmax(0, 1fr);
    gap: 56px;
  }

  .page-faq .faq-toc {
    position: sticky;
    top: 124px;
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-hero__media,
  .page-faq .qa,
  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after {
    transition: none;
  }

  .page-faq .qa:hover {
    transform: none;
  }

  .page-faq .qa__body {
    animation: none;
  }
}