.page-faq {
  --faq-rail: 220px;
  background: var(--c-ink);
  color: var(--c-grey);
  padding-bottom: clamp(2rem, 5vw, 4rem);
  overflow-x: clip;
}

.page-faq a {
  color: var(--c-ice);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-faq a:hover,
.page-faq a:focus-visible {
  color: var(--c-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq img {
  max-width: 100%;
  height: auto;
}

.page-faq .crumbs {
  padding-top: clamp(0.9rem, 2.5vw, 1.6rem);
}

/* 首屏 */
.page-faq .faq-hero {
  display: grid;
  gap: clamp(1.2rem, 3vw, 2rem);
  padding: clamp(1.2rem, 3.5vw, 2.4rem) 0 clamp(1.4rem, 3.5vw, 2.6rem);
  border-bottom: 1px solid var(--line);
  background-image: linear-gradient(180deg, rgba(8, 26, 43, 0.72), rgba(10, 42, 36, 0) 78%);
}

.page-faq .faq-hero h1 {
  margin: 0.5rem 0 0;
  font-size: clamp(1.9rem, 1.28rem + 3vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--c-paper);
  max-width: 22ch;
}

.page-faq .faq-hero .lede {
  margin-top: 1rem;
  max-width: 62ch;
  color: var(--c-grey);
}

.page-faq .faq-hero-side {
  border: 1px solid var(--line-strong);
  background: rgba(31, 77, 66, 0.28);
  padding: 1rem 1rem 0.9rem;
}

.page-faq .side-label {
  margin: 0 0 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-sand);
}

.page-faq .hero-stats {
  margin: 0;
  display: grid;
  gap: 0.6rem;
}

.page-faq .hero-stats > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.8rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px dashed var(--line-soft);
}

.page-faq .hero-stats > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-faq .hero-stats dt {
  font-size: 0.82rem;
  color: var(--c-grey);
}

.page-faq .hero-stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--c-paper);
  white-space: nowrap;
}

.page-faq .hero-stats .num {
  color: var(--c-neon);
  font-size: 1.05rem;
}

/* 双栏骨架 */
.page-faq .faq-layout {
  display: grid;
  gap: clamp(1.2rem, 3vw, 2.4rem);
  padding-top: clamp(1.2rem, 3vw, 2.2rem);
}

.page-faq .faq-rail {
  border: 1px solid var(--line);
  background: rgba(8, 26, 43, 0.55);
  padding: 0.85rem;
}

.page-faq .rail-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--c-sand);
}

.page-faq .rail-links {
  list-style: none;
  margin: 0.6rem 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .rail-links a {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.5rem 0.55rem;
  border-left: 2px solid transparent;
  color: var(--c-grey);
  font-size: 0.93rem;
  white-space: nowrap;
}

.page-faq .rail-links a:hover,
.page-faq .rail-links a:focus-visible {
  background: rgba(124, 255, 107, 0.08);
  border-left-color: var(--c-neon);
  color: var(--c-paper);
  text-decoration: none;
}

.page-faq .rail-n {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-sand);
}

.page-faq .rail-note {
  margin: 0.9rem 0 0;
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--c-ice);
}

/* 章节 */
.page-faq .faq-section {
  padding: clamp(1.4rem, 3.5vw, 2.4rem) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 108px;
}

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

.page-faq .sec-head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.page-faq .sec-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(0.85rem, 0.8rem + 0.3vw, 1rem);
  letter-spacing: 0.05em;
  color: var(--c-neon);
  transition: color var(--dur) var(--ease);
}

.page-faq .sec-head h2 {
  margin: 0;
  font-size: clamp(1.28rem, 1.02rem + 1.2vw, 1.88rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-faq .faq-section:target .sec-num {
  color: var(--c-ember);
}

.page-faq .faq-section:target .sec-head h2 {
  color: var(--c-neon);
}

.page-faq .sec-lede {
  margin: 0 0 1.1rem;
  max-width: 66ch;
  line-height: 1.75;
}

/* 三步上手 */
.page-faq .step-list {
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.8rem;
}

.page-faq .step {
  border: 1px solid var(--line);
  border-top: 2px solid var(--c-moss);
  background-image: linear-gradient(158deg, rgba(31, 77, 66, 0.42), rgba(8, 26, 43, 0.5));
  padding: 1.05rem 1rem 1rem;
}

.page-faq .step::before {
  counter-increment: step;
  content: "0" counter(step);
  display: block;
  margin-bottom: 0.65rem;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  line-height: 1;
  color: rgba(124, 255, 107, 0.45);
  transition: color var(--dur) var(--ease);
}

.page-faq .step:hover::before {
  color: var(--c-neon);
}

.page-faq .step-tag {
  display: inline-block;
  margin-bottom: 0.5rem;
  padding: 0.16rem 0.45rem;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--c-sand);
}

.page-faq .step h3 {
  margin: 0 0 0.45rem;
  font-size: 1.04rem;
  line-height: 1.36;
  color: var(--c-paper);
}

.page-faq .step p {
  margin: 0 0 0.6rem;
  font-size: 0.94rem;
  line-height: 1.72;
}

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

.page-faq .step-link {
  margin-top: 0.75rem;
}

.page-faq .step-link a {
  display: inline-block;
  padding-bottom: 1px;
  border-bottom: 1px solid rgba(142, 216, 232, 0.4);
  font-family: var(--font-mono);
  font-size: 0.79rem;
}

/* 文档索引 */
.page-faq .doc-index {
  counter-reset: doc;
  display: grid;
  gap: 0.7rem;
}

.page-faq .doc-group {
  position: relative;
  border: 1px solid var(--line);
  background: rgba(8, 26, 43, 0.5);
  padding: 0.9rem 1rem 0.9rem 3.3rem;
}

.page-faq .doc-group::before {
  counter-increment: doc;
  content: counter(doc, decimal-leading-zero);
  position: absolute;
  left: 0.95rem;
  top: 0.88rem;
  font-family: var(--font-mono);
  font-size: 1.18rem;
  line-height: 1;
  color: var(--c-sand);
}

.page-faq .doc-group--key {
  border-color: rgba(124, 255, 107, 0.45);
  background-image: linear-gradient(152deg, rgba(31, 77, 66, 0.55), rgba(8, 26, 43, 0.62));
}

.page-faq .doc-group h3 {
  margin: 0 0 0.25rem;
  font-size: 1.02rem;
  color: var(--c-paper);
}

.page-faq .doc-meta {
  margin: 0 0 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.04em;
  color: var(--c-ice);
}

.page-faq .doc-items {
  margin: 0;
  padding-left: 1rem;
  display: grid;
  gap: 0.28rem;
  font-size: 0.9rem;
  line-height: 1.6;
}

.page-faq .doc-more {
  margin: 0.7rem 0 0;
  font-size: 0.82rem;
}

.page-faq .doc-figure {
  margin: 1.1rem 0 0;
}

.page-faq .doc-figure img {
  display: block;
  width: 100%;
}

/* iOS 权益 */
.page-faq .ios-grid {
  display: grid;
  gap: clamp(1rem, 3vw, 1.8rem);
}

.page-faq .ios-copy p {
  margin: 0 0 0.9rem;
  line-height: 1.78;
  max-width: 64ch;
}

.page-faq .tier-list {
  list-style: none;
  margin: 1rem 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-faq .tier-list li {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed var(--line-soft);
  font-size: 0.93rem;
  line-height: 1.6;
}

.page-faq .tier-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-faq .path-steps {
  list-style: none;
  margin: 1.1rem 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.page-faq .path-steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.7rem;
  align-items: baseline;
  padding: 0.5rem 0.8rem;
  border-left: 2px solid var(--c-moss);
  background: rgba(31, 77, 66, 0.22);
  font-size: 0.92rem;
  line-height: 1.6;
}

.page-faq .path-steps .step-tag {
  margin-bottom: 0;
}

.page-faq .ios-note {
  font-size: 0.92rem;
  line-height: 1.76;
  color: var(--c-grey);
  border-top: 1px solid var(--line);
  padding-top: 0.9rem;
}

.page-faq .ios-note .num {
  font-family: var(--font-mono);
  color: var(--c-ember);
}

.page-faq .ios-figure {
  margin: 0;
}

/* 导出与常见问题 */
.page-faq .filter-wrap {
  margin-top: 0.3rem;
}

.page-faq .faq-list {
  display: grid;
  gap: 0.55rem;
  margin-top: 1rem;
}

.page-faq .faq-item {
  border: 1px solid var(--line);
  background: rgba(8, 26, 43, 0.5);
  padding: 0 1rem;
  transition: border-color var(--dur) var(--ease);
}

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

.page-faq .faq-item summary {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.8rem;
  padding: 0.8rem 0;
  list-style: none;
  cursor: pointer;
  font-size: 0.97rem;
  color: var(--c-paper);
}

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

.page-faq .faq-item summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--c-neon);
}

.page-faq .faq-item[open] summary::after {
  content: "−";
}

.page-faq .faq-item[open] {
  border-color: rgba(124, 255, 107, 0.35);
}

.page-faq .faq-item p {
  margin: 0 0 0.9rem;
  max-width: 68ch;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--c-grey);
}

.page-faq .export-more {
  margin: 1rem 0 0;
  font-size: 0.88rem;
}

/* 联系支持 */
.page-faq .contact-grid {
  display: grid;
  gap: 0.8rem;
}

.page-faq .contact-card {
  border: 1px solid var(--line);
  background: rgba(31, 77, 66, 0.26);
  padding: 1rem;
}

.page-faq .contact-k {
  margin: 0 0 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--c-sand);
}

.page-faq .contact-v {
  margin: 0 0 0.55rem;
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 0.85rem + 0.4vw, 1.1rem);
  word-break: break-word;
}

.page-faq .contact-v a {
  color: var(--c-neon);
}

.page-faq .contact-tip {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--c-grey);
}

.page-faq .contact-more {
  margin: 1.1rem 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
}

/* 移动端：目录转为横向滑动条 */
@media (max-width: 899px) {
  .page-faq .rail-links {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    padding-bottom: 0.35rem;
  }

  .page-faq .rail-links a {
    border-left: 0;
    border-bottom: 2px solid transparent;
  }

  .page-faq .rail-links a:hover,
  .page-faq .rail-links a:focus-visible {
    border-left-color: transparent;
    border-bottom-color: var(--c-neon);
  }
}

@media (min-width: 640px) {
  .page-faq .contact-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-faq .step-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1fr) 288px;
    align-items: end;
  }

  .page-faq .ios-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.6rem);
    align-items: start;
  }

  .page-faq .faq-rail-inner {
    position: sticky;
    top: 112px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq a,
  .page-faq .step::before,
  .page-faq .sec-num,
  .page-faq .faq-item {
    transition: none;
  }
}