.page-faq {
  --faq-num-col: 46px;
  --faq-answer-col: calc(var(--faq-num-col) + 18px);
  position: relative;
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
}

.page-faq::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 640px;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(118% 78% at 80% 0%, rgba(53, 224, 208, 0.16), transparent 62%),
    radial-gradient(88% 68% at 8% 14%, rgba(255, 138, 61, 0.10), transparent 64%);
}

.page-faq .section {
  position: relative;
  z-index: 1;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: calc(var(--header-h) + 46px) 0 52px;
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: 32px;
  margin-top: 26px;
}

.page-faq .faq-eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-faq h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 5.2vw, 52px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
  max-width: 22ch;
}

.page-faq .faq-lede {
  margin: 20px 0 0;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.78;
  color: rgba(242, 246, 255, 0.8);
  max-width: 60ch;
}

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

.page-faq .faq-hero-note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--orange);
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
  max-width: 52ch;
}

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

/* ---------- 分组锚点条 ---------- */
.page-faq .faq-jump {
  position: relative;
  z-index: 3;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(16, 31, 68, 0.86);
}

.page-faq .faq-jump-inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-top: 12px;
  padding-bottom: 12px;
  scrollbar-width: none;
}

.page-faq .faq-jump-inner::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-jump-item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--ink-2);
  color: var(--white);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-faq .faq-jump-item .mono {
  font-size: 12px;
  color: var(--cyan);
  transition: color var(--t-fast) var(--ease);
}

.page-faq .faq-jump-item:hover,
.page-faq .faq-jump-item:focus-visible {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-faq .faq-jump-item:hover .mono,
.page-faq .faq-jump-item:focus-visible .mono {
  color: var(--ink);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  padding: 52px 0 16px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-group:first-of-type {
  border-top: 0;
}

.page-faq .faq-group-head {
  display: grid;
  gap: 10px;
  max-width: 62ch;
}

.page-faq .faq-group-idx {
  display: inline-block;
  justify-self: start;
  padding: 3px 0 3px 10px;
  border-left: 2px solid var(--orange);
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-faq .faq-group-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--white);
}

.page-faq .faq-group-head p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(242, 246, 255, 0.68);
}

.page-faq .faq-group-body {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  border-top: 1px solid var(--line);
}

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

.page-faq .qa-q {
  display: grid;
  grid-template-columns: var(--faq-num-col) minmax(0, 1fr) 18px;
  gap: 12px;
  align-items: start;
  padding: 17px 4px;
  cursor: pointer;
  list-style: none;
  transition: background var(--t-fast) var(--ease);
}

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

.page-faq .qa-q::marker {
  content: "";
}

.page-faq .qa-q:hover {
  background: rgba(53, 224, 208, 0.06);
}

.page-faq .qa-q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .qa-num {
  padding-top: 4px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-faq .qa-title {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.62;
  color: var(--white);
}

.page-faq .qa[open] .qa-title {
  color: var(--cyan-soft);
}

.page-faq .qa-toggle {
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 3px;
}

.page-faq .qa-toggle::before,
.page-faq .qa-toggle::after {
  content: "";
  position: absolute;
  background: var(--cyan);
}

.page-faq .qa-toggle::before {
  top: 8px;
  left: 0;
  width: 18px;
  height: 1px;
}

.page-faq .qa-toggle::after {
  top: 0;
  left: 8px;
  width: 1px;
  height: 18px;
  transition: transform var(--t-fast) var(--ease);
}

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

.page-faq .qa-a {
  padding: 0 6px 0 var(--faq-answer-col);
  margin: 0 0 20px;
  animation: faq-reveal var(--t-mid) var(--ease) both;
}

.page-faq .qa[open] .qa-a {
  border-left: 2px solid var(--cyan);
}

.page-faq .qa-a p {
  margin: 0 0 10px;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(242, 246, 255, 0.82);
}

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

.page-faq .qa-a .mono {
  color: var(--cyan-soft);
}

@keyframes faq-reveal {
  from {
    opacity: 0.35;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 侧翼视觉 ---------- */
.page-faq .faq-aside {
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--ink-2);
  padding: 12px;
}

.page-faq .faq-aside .media-caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.66;
  color: var(--muted);
}

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

/* 排查顺序 */
.page-faq .faq-ladder-title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

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

.page-faq .faq-ladder-list li {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 11px 3px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.6;
  color: rgba(242, 246, 255, 0.84);
}

.page-faq .faq-ladder-list li:last-child {
  border-bottom: 1px solid var(--line);
  color: var(--cyan-soft);
}

.page-faq .faq-ladder-list .mono {
  color: var(--cyan);
  font-size: 13px;
}

/* 收藏与更新对照 */
.page-faq .faq-pair {
  display: grid;
  gap: 10px;
}

.page-faq .faq-pair-cell {
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 16px;
  background: linear-gradient(160deg, rgba(53, 224, 208, 0.08), transparent 70%);
}

.page-faq .faq-pair-cell--accent {
  background: linear-gradient(160deg, rgba(255, 138, 61, 0.14), transparent 70%);
}

.page-faq .faq-pair-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-faq .faq-pair-value {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 36px;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-pair-cell--accent .faq-pair-value {
  color: var(--orange);
}

.page-faq .faq-pair-desc {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.66;
  color: rgba(242, 246, 255, 0.78);
}

/* 设备说明 */
.page-faq .faq-device-title {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .faq-device-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .faq-device-list li {
  padding: 12px 0;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(242, 246, 255, 0.82);
}

.page-faq .faq-device-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-device-list .mono {
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-next {
  padding: 52px 0 76px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-next h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-next-lede {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(242, 246, 255, 0.68);
  max-width: 54ch;
}

.page-faq .faq-next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-faq .faq-next-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--ink-2);
  color: var(--white);
  font-size: 14px;
  text-decoration: none;
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-faq .faq-next-link .mono {
  font-size: 12px;
  color: var(--orange);
  transition: color var(--t-fast) var(--ease);
}

.page-faq .faq-next-link:hover,
.page-faq .faq-next-link:focus-visible {
  border-color: var(--cyan);
  background: rgba(53, 224, 208, 0.1);
}

.page-faq .faq-next-link:hover .mono,
.page-faq .faq-next-link:focus-visible .mono {
  color: var(--cyan);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 980px) {
  .page-faq {
    --faq-num-col: 72px;
  }

  .page-faq .faq-jump {
    position: sticky;
    top: var(--header-h-slim);
  }

  .page-faq .faq-hero {
    padding-top: calc(var(--header-h) + 64px);
  }

  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 48px;
    align-items: end;
  }

  .page-faq .faq-group {
    padding: 68px 0 22px;
  }

  .page-faq .faq-group-body--aside {
    grid-template-columns: minmax(0, 7fr) minmax(260px, 4fr);
    gap: 40px;
    align-items: start;
  }

  .page-faq .faq-group-body--reverse {
    grid-template-columns: minmax(250px, 4fr) minmax(0, 7fr);
  }

  .page-faq .faq-group-body--reverse .faq-aside {
    order: -1;
  }

  .page-faq .qa-q {
    padding: 20px 6px;
    grid-template-columns: var(--faq-num-col) minmax(0, 1fr) 20px;
  }

  .page-faq .qa-title {
    font-size: 17px;
  }

  .page-faq .faq-aside {
    position: sticky;
    top: calc(var(--header-h-slim) + 76px);
    padding: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-a {
    animation: none;
  }

  .page-faq .qa-toggle::after,
  .page-faq .faq-jump-item,
  .page-faq .faq-next-link {
    transition: none;
  }
}