.page-faq {
  --faq-rail-w: 236px;
  --faq-loop: 128px;
  display: block;
  background-color: var(--ink);
  background-image:
    linear-gradient(180deg, rgba(0, 229, 255, 0.06), transparent 360px),
    repeating-linear-gradient(90deg, rgba(22, 48, 79, 0.28) 0 1px, transparent 1px var(--faq-loop));
  padding-bottom: clamp(56px, 9vw, 104px);
}

.page-faq .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-head {
  position: relative;
  padding: clamp(28px, 5vw, 52px) 0 clamp(26px, 4vw, 40px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-head::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -70px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.16), transparent 68%);
  pointer-events: none;
}

.page-faq .faq-head .page-head__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin: 0 0 clamp(14px, 2vw, 20px);
}

.page-faq .faq-head__ver {
  font-size: 12px;
  color: var(--cyan);
  border-left: 2px solid var(--line);
  padding-left: 12px;
}

.page-faq .faq-h1 {
  max-width: 20ch;
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 700;
}

.page-faq .faq-head .page-head__lede {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 主体分栏 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  padding-top: clamp(26px, 4vw, 46px);
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 左侧分类列 ---------- */

.page-faq .faq-rail {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 16px 14px 18px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

@media (min-width: 900px) {
  .page-faq .faq-rail {
    position: sticky;
    top: 104px;
  }
}

.page-faq .faq-rail__title {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-faq .faq-rail__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

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

.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 8px 8px 10px;
  border-left: 2px solid var(--line);
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--cyan);
  background: rgba(0, 229, 255, 0.07);
}

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

.page-faq .faq-rail__link[aria-current="true"] {
  color: var(--paper);
  border-left-color: var(--cyan);
  background: rgba(0, 229, 255, 0.11);
}

.page-faq .faq-rail__dot {
  flex: none;
  width: 7px;
  height: 7px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-faq .faq-rail__list li:nth-child(2) .faq-rail__dot { background: var(--orange); }
.page-faq .faq-rail__list li:nth-child(3) .faq-rail__dot { background: var(--mint); }
.page-faq .faq-rail__list li:nth-child(4) .faq-rail__dot { background: var(--amber); }
.page-faq .faq-rail__list li:nth-child(5) .faq-rail__dot { background: var(--cyan); }

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

.page-faq .faq-rail__count {
  margin-left: auto;
  font-size: 12px;
  color: var(--muted);
}

.page-faq .faq-rail__foot {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 右侧问答流 ---------- */

.page-faq .faq-stream {
  display: flex;
  flex-direction: column;
  gap: clamp(36px, 5vw, 62px);
  min-width: 0;
}

.page-faq .faq-block {
  scroll-margin-top: 108px;
  min-width: 0;
}

.page-faq #ver { --c: var(--cyan); }
.page-faq #sub { --c: var(--orange); }
.page-faq #mobile { --c: var(--mint); }
.page-faq #device { --c: var(--amber); }
.page-faq #feedback { --c: var(--cyan); }
.page-faq #help { --c: var(--orange); }

.page-faq .faq-block__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding-bottom: 12px;
  margin-bottom: clamp(16px, 2.2vw, 24px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-block__title {
  margin: 0;
  font-size: clamp(20px, 2.8vw, 28px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-faq .faq-block__tag {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c, var(--cyan));
  border: 1px solid currentColor;
  padding: 2px 7px;
  white-space: nowrap;
}

.page-faq .faq-block__note {
  margin: 0 0 0 auto;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 问答卡 ---------- */

.page-faq .qa-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

@media (min-width: 720px) {
  .page-faq .qa-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 18px;
    align-items: start;
  }

  .page-faq .qa-grid > .qa:nth-child(even) {
    margin-top: 26px;
  }
}

.page-faq .qa {
  min-width: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.page-faq .qa:hover {
  border-color: #1d4067;
}

.page-faq .qa[open] {
  background: var(--panel-2);
  border-color: var(--line);
  box-shadow: inset 2px 0 0 var(--c, var(--cyan));
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 14px 15px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
  transition: background-color 0.18s ease;
}

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

.page-faq .qa__q:hover {
  background: rgba(0, 229, 255, 0.06);
}

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

.page-faq .qa__tag {
  flex: none;
  margin-top: 3px;
  padding: 2px 6px;
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--ink-on-accent);
  background: var(--c, var(--cyan));
  white-space: nowrap;
}

.page-faq .qa__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .qa__icon {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
  margin-top: 4px;
}

.page-faq .qa__icon::before,
.page-faq .qa__icon::after {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
  background: var(--muted);
  transition: transform 0.22s ease, background-color 0.22s ease;
}

.page-faq .qa__icon::after {
  transform: rotate(90deg);
}

.page-faq .qa[open] .qa__icon::after {
  transform: rotate(0deg);
}

.page-faq .qa[open] .qa__icon::before,
.page-faq .qa[open] .qa__icon::after {
  background: var(--c, var(--cyan));
}

.page-faq .qa__a {
  padding: 14px 15px 16px;
  border-top: 1px solid var(--line);
  animation: faq-open 0.26s ease both;
}

@keyframes faq-open {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-faq .qa__a p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

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

.page-faq .qa__a strong {
  color: var(--paper);
  font-weight: 600;
}

.page-faq .qa__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.4);
}

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

.page-faq .qa__steps {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin: 0 0 10px;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
}

.page-faq .qa__steps li {
  position: relative;
  padding-left: 32px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
  counter-increment: faqstep;
}

.page-faq .qa__steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  width: 22px;
  text-align: center;
  font-family: var(--f-mono);
  font-size: 10.5px;
  line-height: 19px;
  color: var(--ink-on-accent);
  background: var(--c, var(--cyan));
}

.page-faq .qa__steps li:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 10px;
  top: 23px;
  bottom: -9px;
  width: 1px;
  background: linear-gradient(to bottom, var(--line), transparent);
}

.page-faq .qa__steps li a {
  color: var(--cyan);
  text-decoration: none;
}

.page-faq .qa__copy {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  padding: 10px 12px;
  border: 1px dashed var(--line);
  background: rgba(0, 229, 255, 0.05);
}

.page-faq .qa__copy code {
  font-family: var(--f-mono);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--cyan);
  word-break: break-all;
}

/* ---------- 图片 ---------- */

.page-faq .faq-fig {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 420px;
}

.page-faq .faq-fig--wide {
  max-width: 720px;
}

.page-faq .faq-fig .fig__frame {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

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

.page-faq .faq-fig .fig__cap {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  font-family: var(--f-mono);
}

.page-faq .faq-fig .fig__tag {
  display: inline-block;
  margin-top: 8px;
  padding: 2px 8px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-on-accent);
  background: var(--c, var(--cyan));
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

/* ---------- 帮助区 ---------- */

.page-faq .faq-help__box {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(255, 138, 43, 0.12), transparent 58%),
    var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-faq .faq-help__lead {
  max-width: 52ch;
  margin: 0 0 16px;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.75;
  color: var(--paper);
}

.page-faq .faq-help__meta {
  display: grid;
  gap: 8px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-help__meta li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

.page-faq .faq-help__meta li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 8px;
  height: 2px;
  background: var(--mint);
}

.page-faq .faq-help__contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding: 12px 14px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  background: rgba(6, 18, 37, 0.6);
}

.page-faq .faq-help__contact > span {
  font-size: 13px;
  color: var(--cyan);
  word-break: break-all;
}

.page-faq .faq-help__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 窄屏收敛 ---------- */

@media (max-width: 480px) {
  .page-faq .faq-rail {
    padding: 14px 12px 16px;
  }

  .page-faq .faq-rail__link {
    padding: 7px 6px 7px 9px;
    font-size: 13px;
    gap: 6px;
  }

  .page-faq .faq-rail__count {
    font-size: 11px;
  }

  .page-faq .qa__q {
    font-size: 14.5px;
    padding: 12px 13px;
  }

  .page-faq .qa__a {
    padding: 12px 13px 14px;
  }

  .page-faq .faq-fig {
    max-width: 100%;
  }

  .page-faq .faq-help__acts .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}

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

  .page-faq .qa__q,
  .page-faq .qa,
  .page-faq .qa__icon::before,
  .page-faq .qa__icon::after,
  .page-faq .faq-rail__link {
    transition: none;
  }
}