.page-faq {
  --faq-accent: var(--cyan);
  position: relative;
  padding-bottom: clamp(56px, 9vw, 108px);
  background:
    radial-gradient(1000px 560px at 6% -12%, rgba(0, 229, 199, 0.10), transparent 62%),
    radial-gradient(760px 460px at 102% 4%, rgba(255, 122, 69, 0.075), transparent 58%),
    var(--sea);
  color: var(--mist);
  font-family: var(--font-cn);
  overflow-x: clip;
}

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

.page-faq .mono {
  font-family: var(--font-mono);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  margin: clamp(18px, 3.6vw, 36px) 0 clamp(32px, 5vw, 58px);
  padding: clamp(26px, 4.4vw, 52px) clamp(20px, 3.8vw, 46px);
  border: 1px solid var(--line);
  border-radius: var(--r);
  background:
    linear-gradient(150deg, rgba(0, 229, 199, 0.10), transparent 44%),
    linear-gradient(180deg, var(--card-top), var(--card-bot));
  box-shadow: inset 0 1px 0 rgba(230, 247, 245, 0.06);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(42, 74, 102, 0.6);
  border-radius: calc(var(--r) - 3px);
  pointer-events: none;
}

.page-faq .faq-kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: 0 0 18px;
  max-width: 22ch;
  font-size: clamp(29px, 5.4vw, 52px);
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-faq .faq-lede {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.88;
  color: rgba(230, 247, 245, 0.8);
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 26px;
  padding: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: calc(var(--r) - 2px);
  overflow: hidden;
}

.page-faq .faq-stats > div {
  background: rgba(7, 20, 39, 0.78);
  padding: 12px 14px;
}

.page-faq .faq-stats dt {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-faq .faq-stats dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--mist);
}

.page-faq .faq-quick {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ---------- 主体栅格 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  align-items: start;
}

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

/* ---------- 左侧问题索引 ---------- */

.page-faq .faq-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 8px 2px 10px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq .rail-title {
  display: none;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-faq .faq-rail a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: none;
  padding: 8px 13px;
  border: 1px solid transparent;
  border-radius: 999px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--steel);
  text-decoration: none;
  transition: color 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-faq .faq-rail a .mono {
  font-size: 11px;
  color: var(--cyan);
  opacity: 0.85;
}

.page-faq .faq-rail a:hover,
.page-faq .faq-rail a:focus-visible {
  color: var(--mist);
  background: rgba(0, 229, 199, 0.1);
  border-color: rgba(0, 229, 199, 0.42);
}

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

/* ---------- 问题区块 ---------- */

.page-faq .faq-block {
  position: relative;
  margin-bottom: clamp(32px, 5vw, 58px);
  padding-left: clamp(16px, 2.4vw, 26px);
  scroll-margin-top: 96px;
}

.page-faq .faq-block::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--faq-accent), transparent 88%);
  opacity: 0.75;
}

.page-faq #faq-access { --faq-accent: var(--cyan); }
.page-faq #faq-download { --faq-accent: var(--green); }
.page-faq #faq-version { --faq-accent: var(--orange); }
.page-faq #faq-favorite { --faq-accent: var(--cyan); }
.page-faq #faq-browser { --faq-accent: var(--amber); }
.page-faq #faq-support { --faq-accent: var(--cyan); }

.page-faq .faq-block-head {
  margin-bottom: 18px;
}

.page-faq .faq-index {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--faq-accent);
}

.page-faq .faq-block h2 {
  margin: 8px 0 10px;
  font-size: clamp(21px, 3.1vw, 30px);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-faq .faq-intro {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(230, 247, 245, 0.72);
}

/* ---------- 折叠面板 ---------- */

.page-faq .faq-list {
  counter-reset: faq;
  display: grid;
  gap: 10px;
}

.page-faq .faq-item {
  counter-increment: faq;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(14, 39, 66, 0.66), rgba(10, 27, 49, 0.66));
  overflow: hidden;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease), background 0.3s var(--ease);
}

.page-faq .faq-item:hover {
  border-color: rgba(0, 229, 199, 0.34);
}

.page-faq .faq-item[open] {
  border-color: rgba(0, 229, 199, 0.5);
  background: linear-gradient(180deg, rgba(16, 44, 74, 0.82), rgba(10, 27, 49, 0.8));
  box-shadow: 0 20px 44px -34px rgba(0, 229, 199, 0.7);
}

.page-faq .faq-q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.85vw, 16.5px);
  font-weight: 600;
  line-height: 1.62;
  color: var(--mist);
  transition: color 0.25s var(--ease);
}

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

.page-faq .faq-q::before {
  content: counter(faq, decimal-leading-zero);
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 2.1;
  color: var(--faq-accent);
}

.page-faq .faq-q::after {
  content: "+";
  margin-left: auto;
  flex: none;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
  color: var(--steel);
  transition: transform 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease);
}

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

.page-faq .faq-item[open] .faq-q::after {
  content: "−";
  transform: rotate(180deg);
  color: var(--faq-accent);
  border-color: rgba(0, 229, 199, 0.5);
}

.page-faq .faq-q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}

.page-faq .faq-a {
  padding: 0 16px 17px 44px;
  font-size: 15.5px;
  line-height: 1.88;
  color: rgba(230, 247, 245, 0.78);
}

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

.page-faq .faq-a p + p {
  margin-top: 10px;
}

/* ---------- 配图 ---------- */

.page-faq .faq-figure {
  margin: 0 0 18px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(14, 39, 66, 0.6), var(--trench));
  overflow: hidden;
}

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

.page-faq .faq-figure .media-caption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

/* ---------- 版本时间轴 ---------- */

.page-faq .faq-timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0 0 18px;
  padding: 1px;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}

.page-faq .faq-timeline li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 15px;
  background: rgba(7, 20, 39, 0.8);
}

.page-faq .faq-timeline li.is-current {
  background:
    linear-gradient(90deg, rgba(255, 122, 69, 0.18), rgba(7, 20, 39, 0.8) 58%);
}

.page-faq .faq-tl-node {
  flex: none;
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-faq .faq-timeline li.is-current .faq-tl-node {
  border-color: transparent;
  background: var(--orange);
  color: var(--trench);
  font-weight: 700;
}

.page-faq .faq-tl-text {
  font-size: 14.5px;
  line-height: 1.6;
  color: rgba(230, 247, 245, 0.74);
}

.page-faq .faq-timeline li.is-current .faq-tl-text {
  color: var(--mist);
}

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

/* ---------- 联系信息卡 ---------- */

.page-faq .faq-contact {
  margin-bottom: 18px;
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--r);
  background:
    linear-gradient(135deg, rgba(0, 229, 199, 0.09), transparent 52%),
    linear-gradient(180deg, var(--card-top), var(--card-bot));
}

.page-faq .faq-contact dl {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: 0;
}

.page-faq .faq-contact dt {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-contact dd {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--mist);
  word-break: break-word;
}

.page-faq .faq-contact a {
  color: var(--mist);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: rgba(0, 229, 199, 0.55);
}

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

.page-faq .faq-contact .faq-note {
  margin-top: 5px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 收尾 ---------- */

.page-faq .faq-outro {
  position: relative;
  margin-top: clamp(8px, 2vw, 18px);
  padding: clamp(22px, 3.2vw, 34px);
  border: 1px dashed var(--line);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(7, 20, 39, 0.75), rgba(11, 31, 58, 0.6));
}

.page-faq .faq-outro-title {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 800;
  color: var(--mist);
}

.page-faq .faq-outro-text {
  margin: 0 0 18px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(230, 247, 245, 0.72);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-faq .faq-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-timeline li {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 16px 15px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: 226px minmax(0, 1fr);
    gap: clamp(28px, 3.6vw, 54px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding: 18px 14px 20px;
    border: 1px solid var(--line);
    border-radius: var(--r);
    background: linear-gradient(180deg, rgba(14, 39, 66, 0.85), rgba(10, 27, 49, 0.85));
  }

  .page-faq .rail-title {
    display: block;
  }

  .page-faq .faq-rail a {
    border-radius: 6px;
    padding: 9px 11px;
  }

  .page-faq .faq-a {
    padding: 0 26px 20px 46px;
  }

  .page-faq .faq-q {
    padding: 17px 22px;
  }

  .page-faq .faq-contact dl {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-q::after,
  .page-faq .faq-rail a {
    transition: none;
  }
}