.page-faq {
  --faq-gap: clamp(20px, 3vw, 36px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(20px, 4vw, 44px) 0 clamp(28px, 5vw, 56px);
  isolation: isolate;
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -18%;
  right: -14%;
  width: min(760px, 78%);
  height: 118%;
  background: linear-gradient(140deg, rgba(47, 224, 208, 0.16), rgba(75, 58, 143, 0.34) 58%, rgba(110, 31, 58, 0.22));
  border-radius: 46% 54% 60% 40% / 52% 44% 56% 48%;
  transform: rotate(-7deg);
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  align-items: center;
}

.page-faq .faq-hero__title {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--porcelain);
}

.page-faq .faq-hero__copy .lede {
  max-width: 60ch;
}

.page-faq .faq-hero__ticks {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-faq .faq-hero__ticks .mono {
  color: var(--cyan);
  font-weight: 700;
  margin-right: 4px;
}

.page-faq .faq-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero__media {
  margin: 0;
}

/* ---------- 主骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  padding-bottom: clamp(44px, 7vw, 96px);
}

.page-faq .faq-rail {
  align-self: start;
}

.page-faq .faq-rail .rail__link .mono {
  color: var(--amber);
  font-size: 11px;
  letter-spacing: 0.12em;
  margin-right: 8px;
}

.page-faq .faq-body {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  min-width: 0;
}

/* ---------- 分类面板 ---------- */
.page-faq .faq-block {
  position: relative;
  padding: clamp(20px, 3vw, 32px) clamp(16px, 2.6vw, 30px) clamp(10px, 2vw, 18px);
  background: var(--indigo);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-faq .faq-block::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--cat, var(--cyan));
  opacity: 0.9;
}

.page-faq .faq-block--entry {
  --cat: var(--cyan);
}

.page-faq .faq-block--updates {
  --cat: var(--neon);
  background: var(--abyss);
}

.page-faq .faq-block--data {
  --cat: var(--amber);
}

.page-faq .faq-block--library {
  --cat: var(--violet);
  background: rgba(75, 58, 143, 0.24);
}

.page-faq .faq-block--device {
  --cat: var(--cyan);
}

.page-faq .faq-block--support {
  --cat: var(--amber);
  background: rgba(110, 31, 58, 0.3);
}

.page-faq .faq-block .section__title {
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.2;
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-list {
  margin-top: clamp(12px, 2vw, 20px);
}

.page-faq .qa {
  border-top: 1px solid var(--line);
}

.page-faq .qa:first-child {
  border-top: 0;
}

.page-faq .qa__q {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 2px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.45;
  color: var(--porcelain);
  transition: color 0.16s var(--ease);
}

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

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

.page-faq .qa__q:hover {
  color: var(--cyan);
}

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

.page-faq .qa__arrow {
  flex: none;
  width: 9px;
  height: 9px;
  margin-left: auto;
  border-right: 2px solid var(--fog);
  border-bottom: 2px solid var(--fog);
  transform: rotate(-45deg);
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .qa[open] .qa__arrow {
  transform: rotate(45deg);
  border-color: var(--cyan);
}

.page-faq .qa__a {
  max-width: 68ch;
  padding: 0 2px 18px 22px;
  color: var(--fog);
  font-size: 15px;
  line-height: 1.75;
  border-left: 1px solid var(--line);
  margin-left: 2px;
}

.page-faq .qa[open] .qa__a {
  animation: faq-fade 0.2s var(--ease) both;
}

.page-faq .qa__a p {
  margin: 0 0 8px;
}

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

@keyframes faq-fade {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 设备图 ---------- */
.page-faq .faq-device {
  margin: clamp(14px, 2vw, 22px) 0 0;
}

/* ---------- 步骤与联络面板 ---------- */
.page-faq .faq-callout {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin-top: clamp(12px, 2vw, 20px);
}

.page-faq .faq-callout__lead {
  margin: 0;
  color: var(--porcelain);
  font-size: 15.5px;
  line-height: 1.7;
  max-width: 60ch;
}

.page-faq .steps {
  counter-reset: step;
  list-style: none;
  display: grid;
  gap: 10px;
  margin: 14px 0 0;
  padding: 0;
}

.page-faq .steps li {
  position: relative;
  counter-increment: step;
  padding-left: 42px;
  color: var(--fog);
  font-size: 15px;
  line-height: 1.7;
}

.page-faq .steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-faq .faq-callout__contact {
  padding: clamp(16px, 2.4vw, 24px);
  background: rgba(11, 30, 58, 0.62);
  border: 1px solid var(--line-cyan);
  border-radius: var(--r-md);
}

.page-faq .faq-callout__line {
  margin: 0 0 8px;
  color: var(--porcelain);
  font-size: 15px;
}

.page-faq .faq-callout__line .mono {
  color: var(--cyan);
  word-break: break-all;
}

.page-faq .faq-callout__note {
  margin: 12px 0 16px;
  color: var(--fog);
  font-size: 13.5px;
  line-height: 1.7;
}

.page-faq .faq-callout__note .link,
.page-faq .qa__a .link {
  color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-callout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(32px, 4vw, 60px);
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--head-h) + 18px);
  }
}

@media (max-width: 480px) {
  .page-faq .qa__a {
    padding-left: 12px;
  }

  .page-faq .steps li {
    padding-left: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__arrow,
  .page-faq .qa__q {
    transition: color 0.16s linear, border-color 0.16s linear;
  }

  .page-faq .qa[open] .qa__a {
    animation: none;
  }
}