.page-faq {
  --faq-accent: var(--cyan);
  --faq-line-soft: rgba(78, 242, 195, 0.14);
  background-color: var(--night);
  color: var(--warm);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-block: clamp(22px, 5vw, 52px) clamp(28px, 4vw, 46px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background-image: repeating-linear-gradient(90deg, var(--cyan) 0 26px, transparent 26px 58px);
  opacity: 0.4;
  pointer-events: none;
}

.page-faq .faq-hero__title {
  font-family: var(--font-display);
  font-size: clamp(30px, 6.6vw, 58px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  max-width: 24ch;
  color: var(--warm);
}

.page-faq .faq-hero__lede {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .faq-stats {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-faq .faq-stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 11px 13px;
  background-color: var(--board);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
}

.page-faq .faq-stat__k {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-faq .faq-stat__v {
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.4vw, 23px);
  font-weight: 700;
  color: var(--warm);
  line-height: 1.1;
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-faq .faq-rail {
  border-top: 2px solid var(--line);
  padding-top: 14px;
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 8px 13px;
  background-color: var(--board);
  border: 1px solid var(--line);
  color: var(--warm);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.3;
  transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

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

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

.page-faq .faq-rail__hint {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 30ch;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 96px;
  margin-bottom: clamp(38px, 6vw, 66px);
}

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

.page-faq .faq-group--install {
  --faq-accent: var(--orange);
}

.page-faq .faq-group--digest {
  --faq-accent: var(--cyan);
}

.page-faq .faq-group--account {
  --faq-accent: var(--orange);
}

.page-faq .faq-group__head {
  border-left: 3px solid var(--faq-accent);
  padding: 2px 0 2px 14px;
}

.page-faq .faq-group__plate {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 9px;
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--night);
  background-color: var(--faq-accent);
  padding: 2px 7px;
  line-height: 1.4;
}

.page-faq .faq-group__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.4vw, 33px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.005em;
  color: var(--warm);
}

.page-faq .faq-group__note {
  margin: 9px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
  max-width: 56ch;
}

.page-faq .faq-figure {
  margin: 18px 0 14px;
  background-color: var(--board);
  border: 1px solid var(--line);
  overflow: hidden;
}

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

/* ---------- 手风琴 ---------- */
.page-faq .faq-qalist {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-faq .qa {
  background-color: var(--board);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.page-faq .qa[open] {
  border-left-color: var(--faq-accent);
  box-shadow: inset 0 0 0 1px var(--faq-line-soft);
}

.page-faq .qa:hover {
  border-color: rgba(78, 242, 195, 0.34);
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-height: 44px;
  padding: 14px 15px;
  margin: 0;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--warm);
  transition: color 0.15s ease;
}

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

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

.page-faq .qa__q::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--faq-accent);
}

.page-faq .qa[open] .qa__q::after {
  content: "−";
}

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

.page-faq .qa__q:hover {
  color: var(--cyan);
}

.page-faq .qa__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--faq-accent);
}

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

.page-faq .qa__a {
  padding: 0 15px 16px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .qa__a p {
  margin: 0 0 10px;
}

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

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

.page-faq .qa__steps {
  list-style: none;
  margin: 10px 0 10px;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-faq .qa__steps li {
  display: flex;
  gap: 9px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.7;
}

.page-faq .qa__stepnum {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 19px;
  height: 19px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--night);
  background-color: var(--faq-accent);
}

.page-faq .qa__linkrow {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.page-faq .qa__linkrow .btn {
  text-decoration: none;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .qa__q {
    padding: 15px 18px;
    font-size: 15.5px;
  }

  .page-faq .qa__a {
    padding: 0 18px 18px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: 214px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 92px;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 4px;
  }

  .page-faq .faq-rail__link {
    justify-content: flex-start;
    border-color: transparent;
    border-left: 2px solid var(--line);
    background-color: transparent;
    padding: 9px 10px;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    background-color: var(--board);
    border-left-color: var(--cyan);
  }

  .page-faq .faq-rail__hint {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__q,
  .page-faq .faq-rail__link {
    transition: none;
  }
}