.page-faq {
  --faq-gutter: clamp(16px, 2vw, 24px);
  color: var(--c-body);
  background: var(--c-ink);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--c-line);
  background:
    radial-gradient(120% 90% at 84% -10%, rgba(200, 255, 61, 0.12), transparent 58%),
    linear-gradient(180deg, #07160F 0%, var(--c-ink) 72%);
}
.page-faq .faq-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.24;
  filter: saturate(0.75) contrast(1.1);
  pointer-events: none;
}
.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(6, 18, 14, 0.62) 0%, rgba(6, 18, 14, 0.9) 58%, var(--c-ink) 100%);
  pointer-events: none;
}
.page-faq .faq-hero__inner {
  position: relative;
  z-index: 2;
  padding-top: clamp(28px, 4vw, 48px);
  padding-bottom: clamp(48px, 7vw, 88px);
}
.page-faq .faq-hero__lead {
  max-width: 62ch;
  margin: 0 0 26px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-muted);
}
.page-faq .faq-hero h1 {
  margin: 0 0 18px;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(32px, 5.2vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--c-white);
}
.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: clamp(32px, 5vw, 56px);
}
.page-faq .faq-hero__cut {
  position: absolute;
  left: -4%;
  right: -4%;
  bottom: 26px;
  z-index: 1;
  height: 2px;
  background: linear-gradient(90deg, rgba(200, 255, 61, 0), rgba(200, 255, 61, 0.85), rgba(200, 255, 61, 0));
  transform: rotate(-2.4deg);
  transform-origin: right center;
  pointer-events: none;
}

/* ---------- 五步序号带 ---------- */
.page-faq .faq-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-faq .faq-step {
  position: relative;
}
.page-faq .faq-step__sum {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px 8px;
  padding: 14px 0 12px;
  list-style: none;
  cursor: pointer;
  border-top: 1px dashed var(--c-line-soft);
}
.page-faq .faq-step__sum::-webkit-details-marker {
  display: none;
}
.page-faq .faq-step__sum:focus-visible {
  outline: 2px solid var(--c-lime);
  outline-offset: 4px;
}
.page-faq .faq-step__num {
  grid-column: 1 / 2;
  justify-self: start;
  padding: 8px 12px;
  font-family: var(--f-mono);
  font-size: clamp(40px, 5vw, 64px);
  line-height: 0.92;
  letter-spacing: 0.02em;
  color: var(--c-lime);
  background: rgba(16, 41, 31, 0.72);
  border: 1px solid var(--c-line-soft);
}
.page-faq .faq-step__plus {
  position: relative;
  grid-column: 2 / 3;
  justify-self: end;
  width: 14px;
  height: 14px;
  margin-top: 8px;
}
.page-faq .faq-step__plus::before,
.page-faq .faq-step__plus::after {
  content: "";
  position: absolute;
  background: var(--c-lime);
  transition: transform 0.2s ease;
}
.page-faq .faq-step__plus::before {
  left: 0;
  right: 0;
  top: 6px;
  height: 2px;
}
.page-faq .faq-step__plus::after {
  top: 0;
  bottom: 0;
  left: 6px;
  width: 2px;
}
.page-faq .faq-step__d[open] .faq-step__plus::after {
  transform: scaleY(0);
}
.page-faq .faq-step__title {
  grid-column: 1 / -1;
  margin-top: 2px;
  font-family: var(--f-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-white);
}
.page-faq .faq-step__hint {
  grid-column: 1 / -1;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-muted);
}
.page-faq .faq-step__body {
  padding: 4px 0 16px;
}
.page-faq .faq-step__body p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
}
.page-faq .faq-step__go {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.4);
  padding-bottom: 2px;
}
.page-faq .faq-step__go:hover {
  color: var(--c-white);
  border-bottom-color: var(--c-white);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: 44px;
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: clamp(40px, 6vw, 72px);
}
.page-faq .faq-sec + .faq-sec {
  margin-top: clamp(44px, 6vw, 72px);
}
.page-faq .faq-sec__lead {
  max-width: 68ch;
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-muted);
}

/* ---------- 栏目分布 ---------- */
.page-faq .faq-cols {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}
.page-faq .faq-col {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 14px;
  align-items: start;
  padding: 18px 2px;
  border-top: 1px solid var(--c-line);
}
.page-faq .faq-col:last-child {
  border-bottom: 1px solid var(--c-line);
}
.page-faq .faq-col__idx {
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-lime-dim);
}
.page-faq .faq-col h3 {
  margin: 0 0 6px;
  font-family: var(--f-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--c-white);
}
.page-faq .faq-col p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
}
.page-faq .faq-col__n {
  padding-top: 2px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-white);
  white-space: nowrap;
}

/* ---------- 高频问答 ---------- */
.page-faq .faq-q {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}
.page-faq .faq-q > li {
  border-top: 1px solid var(--c-line);
}
.page-faq .faq-q > li:last-child {
  border-bottom: 1px solid var(--c-line);
}
.page-faq .faq-q summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 15px 2px;
  list-style: none;
  cursor: pointer;
}
.page-faq .faq-q summary::-webkit-details-marker {
  display: none;
}
.page-faq .faq-q summary:focus-visible {
  outline: 2px solid var(--c-lime);
  outline-offset: 2px;
}
.page-faq .faq-q summary:hover .faq-q__text {
  color: var(--c-lime);
}
.page-faq .faq-q__text {
  flex: 1 1 220px;
  font-family: var(--f-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--c-body);
  transition: color 0.18s ease;
}
.page-faq .faq-q__tag {
  flex: 0 0 auto;
  padding: 3px 8px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-orange);
  border: 1px solid rgba(255, 154, 60, 0.45);
  white-space: nowrap;
}
.page-faq .faq-q__a {
  max-width: 64ch;
  padding: 0 2px 18px;
}
.page-faq .faq-q__a p {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-muted);
}
.page-faq .faq-q__a a {
  font-size: 13px;
  color: var(--c-lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.4);
  padding-bottom: 2px;
}
.page-faq .faq-q__a a:hover {
  color: var(--c-white);
  border-bottom-color: var(--c-white);
}

/* ---------- 版本 3.2 ---------- */
.page-faq .faq-version {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3.4vw, 36px);
  background: var(--c-panel);
  border: 1px solid var(--c-line);
}
.page-faq .faq-version::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 42px;
  height: 42px;
  background: var(--c-ink);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}
.page-faq .faq-version__grid {
  display: grid;
  gap: 22px;
  margin-top: 20px;
}
.page-faq .faq-version__list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-faq .faq-version__list li {
  position: relative;
  padding: 12px 0 12px 0;
  border-top: 1px dashed var(--c-line-soft);
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
}
.page-faq .faq-version__list li .mono {
  display: block;
  margin-bottom: 4px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-lime);
}
.page-faq .faq-version__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--c-muted);
}
.page-faq .faq-version__note a {
  color: var(--c-lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.4);
}
.page-faq .faq-version__fig {
  margin: 0;
}
.page-faq .faq-version__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c-line-soft);
  background: var(--c-ink);
}
.page-faq .faq-version__fig figcaption {
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--c-muted);
}

/* ---------- 侧栏索引 ---------- */
.page-faq .faq-side__t {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
}
.page-faq .faq-side__t + .faq-side__list {
  margin-bottom: 24px;
}
.page-faq .faq-side__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-faq .faq-side__link {
  display: block;
  padding: 6px 10px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-muted);
  text-decoration: none;
  border: 1px solid var(--c-line);
}
.page-faq .faq-side__link:hover,
.page-faq .faq-side__link:focus-visible {
  color: var(--c-lime);
  border-color: var(--c-lime-dim);
}
.page-faq .faq-side__link[aria-current="true"],
.page-faq .faq-side__link.is-active {
  color: var(--c-ink);
  background: var(--c-lime);
  border-color: var(--c-lime);
}

/* ---------- 联系 ---------- */
.page-faq .faq-support {
  padding-bottom: clamp(56px, 8vw, 96px);
}
.page-faq .faq-support .section-head {
  border-bottom-color: var(--c-line);
}
.page-faq .faq-support__grid {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}
.page-faq .faq-support__card {
  padding: 18px;
  background: rgba(16, 41, 31, 0.62);
  border: 1px solid var(--c-line);
}
.page-faq .faq-support__k {
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-lime);
}
.page-faq .faq-support__v {
  margin: 0 0 8px;
  font-family: var(--f-mono);
  font-size: 14px;
  line-height: 1.5;
  color: var(--c-white);
  word-break: break-word;
}
.page-faq .faq-support__d {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-muted);
}
.page-faq .faq-support__note {
  max-width: 70ch;
  margin: 20px 0 22px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-muted);
  border-left: 2px solid var(--c-lime);
  padding-left: 14px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 28px;
  }
  .page-faq .faq-support__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 36px;
  }
  .page-faq .faq-step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 42px;
    left: 100%;
    width: 36px;
    border-top: 1px dashed var(--c-line-soft);
    pointer-events: none;
  }
  .page-faq .faq-body {
    grid-template-columns: minmax(0, 1fr) 232px;
    column-gap: 56px;
    align-items: start;
  }
  .page-faq .faq-side {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
  .page-faq .faq-side__list {
    display: block;
  }
  .page-faq .faq-side__list li + li {
    margin-top: 6px;
  }
  .page-faq .faq-side__link {
    padding: 8px 0 8px 12px;
    border: 0;
    border-left: 1px solid var(--c-line);
  }
  .page-faq .faq-side__link:hover,
  .page-faq .faq-side__link:focus-visible {
    border-left-color: var(--c-lime-dim);
  }
  .page-faq .faq-side__link[aria-current="true"],
  .page-faq .faq-side__link.is-active {
    color: var(--c-lime);
    background: transparent;
    border-left: 2px solid var(--c-lime);
    padding-left: 12px;
  }
  .page-faq .faq-version__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 28px;
    align-items: start;
  }
  .page-faq .faq-support__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-step__plus::before,
  .page-faq .faq-step__plus::after,
  .page-faq .faq-q__text {
    transition: none;
  }
}