/* ============ 使用指南 / 排障手册 ============ */

.page-faq {
  --faq-body: rgba(233, 238, 245, .78);
  --faq-quiet: #93A3B8;

  padding-top: clamp(84px, 11vw, 132px);
  padding-bottom: clamp(56px, 8vw, 104px);
  font-family: var(--f-head);
  color: var(--text);
  overflow-x: hidden;
}

.page-faq *,
.page-faq *::before,
.page-faq *::after {
  box-sizing: border-box;
}

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

/* ---------- 面包屑 ---------- */

.page-faq .faq-crumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--index);
}

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

.page-faq .faq-crumb a:hover {
  color: var(--grass-lite);
}

.page-faq .faq-crumb .crumb-sep {
  opacity: .45;
}

.page-faq .faq-crumb [aria-current="page"] {
  color: var(--text);
}

/* ---------- 章节通用头部 ---------- */

.page-faq .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--grass-lite);
}

.page-faq .eyebrow::before {
  content: "";
  display: block;
  width: 22px;
  height: 1px;
  background: var(--grass);
}

.page-faq .faq-sec-head {
  max-width: 720px;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-faq .faq-sec-head h2,
.page-faq .faq-ios-copy h2 {
  margin: 12px 0 0;
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-faq .faq-sec-lede {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--faq-body);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding: clamp(26px, 4vw, 46px) 0 clamp(38px, 5.5vw, 68px);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  max-width: 16ch;
  font-size: clamp(36px, 6.2vw, 74px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -.032em;
  color: var(--text);
}

.page-faq .faq-hero .lede {
  margin: 22px 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--faq-body);
}

.page-faq .faq-hero-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--line-soft);
  overflow: hidden;
}

.page-faq .faq-hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 15px 18px;
  background: var(--stand);
}

.page-faq .faq-hero-facts .mono {
  font-family: var(--f-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--grass-lite);
}

.page-faq .faq-hero-facts em {
  font-style: normal;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--index);
}

/* ---------- 第一站：安装三步 ---------- */

.page-faq .faq-install {
  padding-top: clamp(48px, 7vw, 92px);
  padding-bottom: clamp(48px, 7vw, 92px);
}

.page-faq .faq-figure {
  margin: 0 0 clamp(28px, 3.6vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: linear-gradient(150deg, var(--tunnel), var(--stand) 58%, var(--night));
  overflow: hidden;
}

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

.page-faq .faq-figure-cap {
  padding: 12px 18px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--index);
}

.page-faq .step-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--line);
  overflow: hidden;
}

.page-faq .step-card {
  position: relative;
  padding: clamp(22px, 3vw, 34px);
  background: var(--stand);
}

.page-faq .step-card::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--grass), transparent 72%);
  opacity: .4;
  transition: opacity var(--dur) var(--ease);
}

.page-faq .step-card:hover::after {
  opacity: 1;
}

.page-faq .step-index {
  display: block;
  margin-bottom: 14px;
  font-family: var(--f-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--grass);
}

.page-faq .step-card h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--text);
}

.page-faq .step-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--faq-body);
}

.page-faq .faq-escape {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 16px 20px;
  border-left: 2px solid var(--ember);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: rgba(255, 90, 43, .07);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text);
}

/* ---------- 第二站：iOS 反馈 ---------- */

.page-faq .faq-ios {
  padding-top: clamp(48px, 7vw, 92px);
  padding-bottom: clamp(48px, 7vw, 92px);
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-ios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 54px);
}

.page-faq .faq-ios-intro {
  margin: 18px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--faq-body);
}

.page-faq .faq-steps {
  list-style: none;
  counter-reset: fstep;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .faq-steps li {
  counter-increment: fstep;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--faq-body);
}

.page-faq .faq-steps li::before {
  content: counter(fstep, decimal-leading-zero);
  padding-top: 3px;
  font-family: var(--f-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--grass-lite);
}

.page-faq .faq-steps strong {
  font-weight: 700;
  color: var(--text);
}

.page-faq .faq-aside-note {
  margin: 24px 0 0;
  padding: 14px 18px;
  border: 1px solid rgba(245, 200, 107, .35);
  border-radius: var(--r-sm);
  background: rgba(245, 200, 107, .07);
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--text);
}

.page-faq .faq-ios-shot {
  margin: 0;
  max-width: 420px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: linear-gradient(180deg, var(--tunnel), var(--night));
  overflow: hidden;
}

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

/* ---------- 第三站：问答清单 ---------- */

.page-faq .faq-qa {
  padding-top: clamp(48px, 7vw, 92px);
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  overflow: hidden;
  white-space: nowrap;
}

.page-faq .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-faq .filter-chip {
  display: inline-flex;
  align-items: center;
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--glass);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  font-size: 13.5px;
  line-height: 1;
  color: var(--faq-quiet);
  cursor: pointer;
  user-select: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .filter-chip:hover {
  color: var(--text);
  border-color: var(--grass-lite);
}

.page-faq #f-all:checked ~ .filter-bar label[for="f-all"],
.page-faq #f-install:checked ~ .filter-bar label[for="f-install"],
.page-faq #f-push:checked ~ .filter-bar label[for="f-push"],
.page-faq #f-account:checked ~ .filter-bar label[for="f-account"] {
  background: var(--grass);
  border-color: var(--grass);
  color: var(--night);
  font-weight: 700;
}

.page-faq .faq-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
}

.page-faq .faq-list {
  display: grid;
  gap: 10px;
  min-width: 0;
}

.page-faq .faq-item {
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--stand);
  overflow: hidden;
  scroll-margin-top: 130px;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-item:hover {
  border-color: rgba(111, 216, 166, .38);
}

.page-faq .faq-item[open] {
  border-color: rgba(111, 216, 166, .5);
  background: var(--tunnel);
}

.page-faq .faq-item:target {
  border-color: var(--gold);
  box-shadow: 0 0 0 1px rgba(245, 200, 107, .38);
}

.page-faq .faq-q {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 12px;
  padding: 18px clamp(16px, 2.4vw, 24px);
  list-style: none;
  cursor: pointer;
  font-size: clamp(16px, 1.6vw, 19px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
  transition: color var(--dur) var(--ease);
}

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

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

.page-faq .faq-q:focus-visible {
  outline: 2px solid var(--grass-lite);
  outline-offset: -4px;
}

.page-faq .faq-num {
  font-family: var(--f-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .05em;
  color: var(--grass-lite);
}

.page-faq .faq-item[open] .faq-num {
  color: var(--grass);
}

.page-faq .faq-chev {
  position: relative;
  justify-self: end;
  width: 14px;
  height: 14px;
}

.page-faq .faq-chev::before,
.page-faq .faq-chev::after {
  content: "";
  position: absolute;
  background: var(--index);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-chev::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .faq-chev::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

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

.page-faq .faq-item[open] .faq-chev::before {
  background: var(--grass-lite);
}

.page-faq .faq-a {
  margin: 0 clamp(16px, 2.4vw, 24px);
  padding: 16px 0 24px;
  border-top: 1px solid var(--line-soft);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--faq-body);
}

.page-faq .faq-a p {
  margin: 0 0 12px;
}

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

.page-faq .faq-a .faq-steps {
  margin-top: 14px;
}

.page-faq .switch-list {
  list-style: none;
  counter-reset: sw;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-faq .switch-list li {
  counter-increment: sw;
  position: relative;
  padding: 12px 14px 12px 50px;
  border: 1px solid rgba(63, 163, 114, .22);
  border-radius: var(--r-sm);
  background: rgba(63, 163, 114, .08);
  font-size: 14px;
  line-height: 1.72;
  color: var(--faq-body);
}

.page-faq .switch-list li::before {
  content: "0" counter(sw);
  position: absolute;
  left: 16px;
  top: 12px;
  font-family: var(--f-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--grass-lite);
}

/* ---------- 右侧索引 ---------- */

.page-faq .faq-index {
  display: none;
}

.page-faq .faq-index-title {
  margin: 0 0 14px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--index);
}

.page-faq .faq-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .idx-item a {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 8px;
  padding: 7px 8px;
  border-radius: 6px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--faq-quiet);
  text-decoration: none;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .idx-item a:hover,
.page-faq .idx-item a:focus-visible {
  color: var(--text);
  background: rgba(63, 163, 114, .12);
}

.page-faq .idx-num {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--grass);
  padding-top: 2px;
}

/* ---------- 筛选联动 ---------- */

.page-faq #f-install:checked ~ .faq-shell .faq-item:not([data-cat="install"]):not([data-cat="ios"]),
.page-faq #f-install:checked ~ .faq-shell .idx-item:not([data-cat="install"]):not([data-cat="ios"]) {
  display: none;
}

.page-faq #f-push:checked ~ .faq-shell .faq-item:not([data-cat="push"]),
.page-faq #f-push:checked ~ .faq-shell .idx-item:not([data-cat="push"]) {
  display: none;
}

.page-faq #f-account:checked ~ .faq-shell .faq-item:not([data-cat="account"]):not([data-cat="sub"]),
.page-faq #f-account:checked ~ .faq-shell .idx-item:not([data-cat="account"]):not([data-cat="sub"]) {
  display: none;
}

/* ---------- 断点 ---------- */

@media (min-width: 700px) {
  .page-faq .step-rail {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, .85fr);
    align-items: end;
  }

  .page-faq .faq-ios-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(260px, .85fr);
    align-items: start;
  }
}

@media (min-width: 1020px) {
  .page-faq .faq-shell {
    grid-template-columns: minmax(0, 1fr) 250px;
    align-items: start;
  }

  .page-faq .faq-index {
    display: block;
    position: sticky;
    top: 122px;
    align-self: start;
    max-height: calc(100vh - 172px);
    overflow-y: auto;
    padding-left: 20px;
    border-left: 1px solid var(--line);
  }
}

@media (max-width: 560px) {
  .page-faq .faq-q {
    grid-template-columns: 32px minmax(0, 1fr) 16px;
    gap: 8px;
  }

  .page-faq .faq-steps li {
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 8px;
  }

  .page-faq .switch-list li {
    padding-left: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 1ms !important;
  }
}
<<<END>>>