/* ===== 知识中心（/knowledge/）页面专属样式 ===== */
.page-faq {
  --faq-index-w: 236px;
  --faq-sec-gap: clamp(22px, 3.4vw, 42px);
  background: var(--ink);
  color: var(--ice);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(22px, 4vw, 50px) 0 clamp(32px, 5vw, 72px);
  border-bottom: 2px solid var(--tactic);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
}

@media (min-width: 1000px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: end;
  }
}

.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-faq .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--lime);
}

.page-faq .faq-hero__title {
  margin: 16px 0 0;
  font-family: var(--sans);
  font-size: clamp(33px, 7.2vw, 74px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--ice);
}

.page-faq .faq-hero__title em {
  display: block;
  font-style: normal;
  color: var(--lime);
}

.page-faq .faq-hero__desc {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-hero__panel {
  border: 2px solid var(--tactic);
  background: var(--grad-stand);
  box-shadow: var(--shadow-hard);
  padding: clamp(20px, 3vw, 30px);
}

.page-faq .faq-hero__stats {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.page-faq .faq-hero__stats li {
  border-left: 2px solid var(--lime);
  padding-left: 12px;
}

.page-faq .faq-hero__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-faq .faq-hero__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

.page-faq .faq-hero__note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 2px solid var(--tactic);
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 索引 + 问答流 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.6vw, 48px);
  padding-top: clamp(28px, 5vw, 64px);
  padding-bottom: clamp(28px, 5vw, 64px);
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    align-items: start;
  }
}

.page-faq .faq-index {
  border: 2px solid var(--tactic);
  background: var(--stand);
  padding: 18px;
}

.page-faq .faq-index__title {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(136px, 1fr));
  gap: 4px;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.5;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--ice);
  border-left-color: var(--lime);
  background: rgba(124, 255, 61, 0.07);
}

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

@media (min-width: 1024px) {
  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

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

/* ---------- 问答分区 ---------- */
.page-faq .faq-stream {
  display: grid;
  gap: clamp(6px, 1.4vw, 16px);
  min-width: 0;
}

.page-faq .faq-sec {
  padding: var(--faq-sec-gap) 0;
  border-top: 2px solid var(--tactic);
  min-width: 0;
}

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

.page-faq .faq-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: 4px 16px;
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-faq .sec-num {
  grid-row: 1 / span 2;
  font-family: var(--mono);
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-faq .faq-sec__title {
  margin: 0;
  font-size: clamp(21px, 2.8vw, 30px);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--ice);
}

.page-faq .faq-sec__lead {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-sec__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 30px);
  min-width: 0;
}

@media (min-width: 940px) {
  .page-faq .faq-sec__body--split {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-sec__body--split-rev {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.45fr);
    align-items: start;
  }
}

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

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

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

/* ---------- 手风琴 ---------- */
.page-faq .faq-item {
  border: 2px solid var(--tactic);
  background: var(--stand);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.page-faq .faq-item + .faq-item {
  margin-top: 12px;
}

.page-faq .faq-item[open] {
  border-color: var(--lime);
  box-shadow: var(--shadow-soft);
}

.page-faq .faq-item > summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 15px 50px 15px 16px;
  font-size: clamp(14.5px, 1.5vw, 16px);
  font-weight: 700;
  line-height: 1.55;
  color: var(--ice);
  transition: color 0.18s ease;
}

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

.page-faq .faq-item > summary::marker {
  content: "";
}

.page-faq .faq-item > summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 15px;
  font-family: var(--mono);
  font-size: 18px;
  line-height: 1;
  color: var(--lime);
  transition: color 0.18s ease;
}

.page-faq .faq-item[open] > summary::after {
  content: "\2013";
  color: var(--amber);
}

.page-faq .faq-item > summary:hover {
  color: var(--lime);
}

.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.page-faq .faq-item__body {
  padding: 16px 18px 18px;
  border-top: 2px solid var(--tactic);
}

.page-faq .faq-item[open] .faq-item__body {
  border-top-color: rgba(124, 255, 61, 0.35);
  animation: faqOpen 0.28s ease both;
}

.page-faq .faq-item__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

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

/* ---------- 设备同步示意 ---------- */
.page-faq .faq-devices {
  margin: 0;
  border: 2px solid var(--tactic);
  background: var(--stand);
  padding: clamp(14px, 2vw, 22px);
}

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

.page-faq .faq-devices figcaption {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 容量刻度 ---------- */
.page-faq .faq-scale {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

@media (min-width: 700px) {
  .page-faq .faq-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-faq .faq-scale li {
  border: 2px solid var(--tactic);
  border-top-color: var(--cyan);
  background: var(--ink);
  padding: 9px 11px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--lime);
}

.page-faq .faq-scale li span {
  display: block;
  margin-top: 3px;
  font-family: var(--sans);
  font-size: 11.5px;
  letter-spacing: 0;
  color: var(--mist);
}

/* ---------- 收尾路径 ---------- */
.page-faq .faq-start {
  margin-top: clamp(18px, 3vw, 44px);
  padding: clamp(34px, 5vw, 72px) 0;
  background: var(--grad-stand);
  border-top: 2px solid var(--tactic);
}

.page-faq .faq-start__title {
  margin: 12px 0 0;
  font-size: clamp(22px, 3.2vw, 36px);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--ice);
}

.page-faq .faq-start__steps {
  list-style: none;
  margin: clamp(22px, 3vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 900px) {
  .page-faq .faq-start__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-faq .faq-start__steps li {
  display: grid;
  align-content: start;
  gap: 8px;
  border: 2px solid var(--tactic);
  background: rgba(5, 11, 30, 0.72);
  padding: 20px;
}

.page-faq .faq-start__num {
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-faq .faq-start__steps h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 900;
  line-height: 1.4;
  color: var(--ice);
}

.page-faq .faq-start__steps p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-start__steps a,
.page-faq .faq-start__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 214, 255, 0.5);
}

.page-faq .faq-start__steps a:hover,
.page-faq .faq-start__steps a:focus-visible,
.page-faq .faq-start__note a:hover,
.page-faq .faq-start__note a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-faq .faq-start__note {
  margin: 22px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item > summary,
  .page-faq .faq-item > summary::after,
  .page-faq .faq-index__link {
    transition: none;
  }

  .page-faq .faq-item[open] .faq-item__body {
    animation: none;
  }
}