.page-faq {
  --faq-rail: 250px;
  --faq-panel: #0E131A;
  --faq-glow: rgba(53, 242, 224, 0.45);
  background: var(--ink-900);
  color: var(--white);
  padding-bottom: 0;
}

.page-faq a {
  color: inherit;
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding-top: clamp(18px, 3vw, 30px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-faq .faq-crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-crumb a:hover,
.page-faq .faq-crumb a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-faq .faq-crumb span:last-child {
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 56px) 0 clamp(44px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
  background: var(--ink-900);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.4;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.15) 72%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.15) 72%, transparent 100%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -16%;
  right: -12%;
  width: min(52vw, 560px);
  aspect-ratio: 1 / 1;
  background: linear-gradient(140deg, var(--cyan), var(--cyan-deep));
  opacity: 0.16;
  clip-path: polygon(30% 0, 100% 0, 100% 70%, 0 100%);
  pointer-events: none;
}

.page-faq .faq-hero__bar {
  position: absolute;
  top: 14%;
  left: 50%;
  width: 38vw;
  max-width: 420px;
  height: 6px;
  background: linear-gradient(90deg, transparent, var(--amber), transparent);
  opacity: 0.85;
  transform: rotate(-14deg);
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 52px);
  align-items: end;
}

.page-faq .faq-hero__main h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(32px, 7vw, 68px);
  line-height: 1.06;
  letter-spacing: 0.005em;
  color: var(--white);
  max-width: 20ch;
}

.page-faq .faq-hero__main .lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-faq .faq-hero__stats b {
  display: inline-block;
  margin-right: 4px;
  font-size: 20px;
  font-weight: 500;
  color: var(--amber);
  letter-spacing: 0.02em;
}

.page-faq .faq-quick {
  display: grid;
  gap: 12px;
  margin-top: 12px;
}

.page-faq .faq-quick__item {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  background: var(--faq-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .faq-quick__item:hover,
.page-faq .faq-quick__item:focus-visible {
  transform: translateY(-4px);
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px var(--faq-glow), 0 14px 30px rgba(0, 0, 0, 0.5);
}

.page-faq .faq-quick__k {
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
}

.page-faq .faq-quick__v {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 主体骨架：左侧索引 + 右侧内容 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 48px);
  padding-top: clamp(28px, 4vw, 48px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-faq .faq-rail {
  position: static;
  padding: 0;
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  margin: 10px 0 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-rail__list li {
  flex: 0 0 auto;
}

.page-faq .faq-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-rail__list a .num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible,
.page-faq .faq-rail__list a[aria-current="true"] {
  color: var(--white);
  border-color: var(--cyan);
  background: rgba(53, 242, 224, 0.08);
}

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

/* ---------- 章节 ---------- */
.page-faq .faq-sec {
  padding: clamp(30px, 4vw, 52px) 0;
  border-top: 1px solid var(--line);
}

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

.page-faq .faq-sec__head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
  margin-bottom: clamp(16px, 2vw, 24px);
}

.page-faq .faq-sec__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-faq .faq-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(21px, 3.2vw, 31px);
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-faq .faq-sec__lede {
  margin: 0 0 clamp(18px, 3vw, 28px);
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-qa {
  display: grid;
  gap: 12px;
}

.page-faq .faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--faq-panel);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .faq-item:hover {
  border-color: rgba(53, 242, 224, 0.35);
}

.page-faq .faq-item[open] {
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px rgba(53, 242, 224, 0.22);
}

.page-faq .faq-item > summary {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 17px 20px 17px 24px;
  list-style: none;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--white);
}

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

.page-faq .faq-item > summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 3px;
  background: var(--cyan);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}

.page-faq .faq-item[open] > summary::before {
  opacity: 1;
}

.page-faq .faq-item > summary::after {
  content: "+";
  margin-left: auto;
  padding-left: 14px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.3;
  color: var(--cyan);
}

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

.page-faq .faq-item .accordion__body {
  padding: 0 20px 20px 24px;
}

.page-faq .faq-verdict {
  margin: 0 0 12px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-verdict strong {
  color: var(--amber-soft);
  font-weight: 600;
}

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

.page-faq .faq-steps li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-steps li::before {
  counter-increment: faqstep;
  content: counter(faqstep, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  padding-top: 4px;
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--faq-panel);
}

.page-faq .faq-figure--side {
  margin-top: 16px;
}

.page-faq .faq-figure--flow {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-faq .faq-figure--flow figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 四步流程 ---------- */
.page-faq .faq-flow4 {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-faq .faq-flow4__step {
  position: relative;
  padding: 22px 18px 18px;
  background: var(--faq-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-flow4__step::before {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
}

.page-faq .faq-flow4__step:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
}

.page-faq .faq-flow4__step .num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-faq .faq-flow4__step h3 {
  margin: 10px 0 8px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
}

.page-faq .faq-flow4__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 提示清单 ---------- */
.page-faq .faq-note {
  margin-top: clamp(22px, 3vw, 32px);
  padding: clamp(20px, 3vw, 28px);
  background: var(--faq-panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius-sm);
}

.page-faq .faq-note__title {
  margin: 0 0 14px;
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
}

.page-faq .faq-checklist {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-checklist li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

.page-faq .faq-checklist--tight li {
  font-size: 14px;
}

/* ---------- 换设备确认顺序 ---------- */
.page-faq .faq-roadmap {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: road;
}

.page-faq .faq-roadmap li {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 30px) clamp(38px, 5vw, 56px);
  border-left: 1px solid var(--line);
  margin-left: 8px;
}

.page-faq .faq-roadmap li:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-faq .faq-roadmap li::before {
  counter-increment: road;
  content: counter(road, decimal-leading-zero);
  position: absolute;
  left: -1px;
  top: 0;
  transform: translateX(-50%);
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-faq .faq-roadmap__k {
  display: block;
  margin-bottom: 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
}

.page-faq .faq-roadmap li p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 标签筛选 ---------- */
.page-faq .faq-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(18px, 3vw, 26px);
}

.page-faq .faq-taglist {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-faq .faq-tagcard {
  padding: 20px;
  background: var(--faq-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-tagcard:hover {
  transform: translateY(-4px);
  border-color: rgba(53, 242, 224, 0.45);
}

.page-faq .faq-tagcard[hidden] {
  display: none;
}

.page-faq .faq-tagcard__cat {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber-soft);
}

.page-faq .faq-tagcard h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
}

.page-faq .faq-tagcard p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 联系入口切换 ---------- */
.page-faq .faq-contact-teaser {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  grid-template-columns: minmax(0, 1fr);
  padding: clamp(22px, 3vw, 34px);
  background:
    linear-gradient(160deg, rgba(53, 242, 224, 0.07), transparent 62%),
    var(--faq-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-faq .faq-contact-teaser__body p {
  margin: 0 0 16px;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-contact-teaser__body .btn {
  margin-top: 20px;
}

.page-faq .faq-links {
  display: grid;
  gap: 10px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-links a {
  display: block;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-links a:hover,
.page-faq .faq-links a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-sec--last {
  padding-bottom: 0;
}

.page-faq .faq-mail {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
  padding: clamp(20px, 3vw, 28px);
  background: var(--faq-panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius-sm);
}

.page-faq .faq-mail__info {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.page-faq .faq-mail__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-faq .faq-mail__value {
  font-family: var(--font-mono);
  font-size: clamp(15px, 2.4vw, 19px);
  letter-spacing: 0.02em;
  color: var(--white);
  word-break: break-all;
}

.page-faq .faq-mail__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-faq .faq-mail__actions .copy-status {
  font-size: 13px;
  color: var(--cyan);
}

.page-faq .faq-next {
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
  margin-top: clamp(20px, 3vw, 28px);
}

.page-faq .faq-next__item {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  background: var(--ink-900);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .faq-next__item:hover,
.page-faq .faq-next__item:focus-visible {
  transform: translateY(-4px);
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px var(--faq-glow);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-flow4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-taglist {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-faq .faq-contact-teaser {
    grid-template-columns: 8fr 4fr;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: 7fr 5fr;
  }

  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    padding-top: 4px;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__list a {
    display: flex;
    width: 100%;
    border-radius: 999px;
    justify-content: flex-start;
  }

  .page-faq .faq-sec__split {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: clamp(24px, 3vw, 40px);
    align-items: start;
  }

  .page-faq .faq-figure--side {
    margin-top: 0;
  }

  .page-faq .faq-flow4__step {
    padding: 24px 20px 20px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-hero__main h1 {
    font-size: clamp(52px, 5.4vw, 76px);
  }

  .page-faq .faq-sec__split {
    grid-template-columns: minmax(0, 1fr) 340px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-quick__item,
  .page-faq .faq-tagcard,
  .page-faq .faq-flow4__step,
  .page-faq .faq-next__item {
    transition: none;
  }

  .page-faq .faq-quick__item:hover,
  .page-faq .faq-tagcard:hover,
  .page-faq .faq-flow4__step:hover,
  .page-faq .faq-next__item:hover {
    transform: none;
  }
}