.page-faq {
  --faq-rule: var(--line);
  --faq-soft: rgba(11, 36, 29, 0.72);
  --faq-body-text: #C9DED7;
  color: var(--paper);
  background-color: var(--ink);
  background-image:
    repeating-linear-gradient(90deg, rgba(36, 68, 59, 0.28) 0 1px, transparent 1px 88px),
    radial-gradient(120% 55% at 84% -8%, rgba(53, 242, 208, 0.12), transparent 62%),
    linear-gradient(180deg, #0B241D 0%, #06130F 58%, #06130F 100%);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-block: clamp(1.25rem, 3.5vw, 2.25rem) clamp(2rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 6.6vw, 4.1rem);
  line-height: 1.03;
  letter-spacing: -0.025em;
  margin: 0.5rem 0 1rem;
  color: var(--paper);
  text-wrap: balance;
}

.page-faq .faq-hero__lead {
  max-width: 54ch;
  margin: 0;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.85;
  color: var(--faq-body-text);
}

.page-faq .faq-quicklist {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
  border: 1px solid var(--faq-rule);
  background: var(--faq-rule);
}

.page-faq .faq-quick {
  position: relative;
  display: grid;
  gap: 0.3rem;
  padding: 1rem 1rem 1.05rem 1.25rem;
  background: var(--panel);
  color: var(--paper);
  text-decoration: none;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-faq .faq-quick::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1rem;
  bottom: 1rem;
  width: 2px;
  background: var(--orange);
  transform: scaleY(0.35);
  transform-origin: top;
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-quick:hover,
.page-faq .faq-quick:focus-visible {
  background: #0E2B22;
  color: var(--mint);
  outline: none;
}

.page-faq .faq-quick:hover::before,
.page-faq .faq-quick:focus-visible::before {
  transform: scaleY(1);
  background: var(--cyan);
}

.page-faq .faq-quick__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-faq .faq-quick__title {
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: 0.01em;
}

.page-faq .faq-quick__meta {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-faq .faq-hero__aside {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.page-faq .faq-figure {
  margin: 0;
  border: 1px solid var(--faq-rule);
  background: var(--panel);
  overflow: hidden;
}

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

.page-faq .faq-hero__aside .live-flag {
  margin: 0;
}

/* ---------- 索引 + 内容 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
  padding-block: clamp(2rem, 4vw, 3rem) clamp(3rem, 6vw, 5rem);
}

.page-faq .faq-index {
  border: 1px solid var(--faq-rule);
  background: var(--faq-soft);
  padding: 0.9rem 1rem 1rem;
}

.page-faq .faq-index__title {
  margin: 0 0 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.35rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  white-space: nowrap;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--faq-rule);
  color: var(--paper);
  text-decoration: none;
  font-size: 0.875rem;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-color: var(--cyan);
  color: var(--mint);
  outline: none;
}

.page-faq .faq-index__count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--orange);
}

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

/* ---------- 章节 ---------- */
.page-faq .faq-block {
  padding-top: clamp(1.75rem, 3.5vw, 2.5rem);
  border-top: 1px solid var(--faq-rule);
  margin-bottom: clamp(2.25rem, 5vw, 3.5rem);
}

.page-faq .faq-block:first-child {
  padding-top: 0;
  border-top: 0;
}

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

.page-faq .faq-block h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.6vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0 0 0.85rem;
  color: var(--paper);
  text-wrap: balance;
}

.page-faq .faq-block__lead {
  max-width: 64ch;
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--faq-body-text);
}

/* ---------- 步骤 ---------- */
.page-faq .faq-steps {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-step {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 0.75rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-step__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  color: var(--cyan);
  letter-spacing: -0.02em;
  padding-top: 0.15rem;
}

.page-faq .faq-step p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--faq-body-text);
}

.page-faq .faq-block .faq-figure {
  margin: 1.5rem 0;
}

/* ---------- 数据条 ---------- */
.page-faq .faq-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1px;
  margin: 1.5rem 0;
  border: 1px solid var(--faq-rule);
  background: var(--faq-rule);
}

.page-faq .faq-metric {
  padding: 1rem;
  background: var(--panel);
}

.page-faq .faq-metric__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--orange);
}

.page-faq .faq-metric__label {
  display: block;
  margin-top: 0.55rem;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 版本线 ---------- */
.page-faq .faq-versions {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-version {
  display: grid;
  grid-template-columns: 6rem minmax(0, 1fr);
  gap: 0.3rem 0.9rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-version__id {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-faq .faq-version__year {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--amber);
  align-self: center;
}

.page-faq .faq-version__desc {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--faq-body-text);
}

/* ---------- 说明块 ---------- */
.page-faq .faq-notes {
  display: grid;
  gap: 1px;
  margin: 1.5rem 0;
  border: 1px solid var(--faq-rule);
  background: var(--faq-rule);
}

.page-faq .faq-note {
  position: relative;
  padding: 1rem 1rem 1rem 1.2rem;
  background: var(--slate);
}

.page-faq .faq-note::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cyan);
}

.page-faq .faq-note strong {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.03em;
  color: var(--mint);
  margin-bottom: 0.4rem;
}

.page-faq .faq-note p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--faq-body-text);
}

/* ---------- 联系块 ---------- */
.page-faq .faq-contact {
  display: grid;
  gap: 1rem;
  justify-items: start;
  margin-top: 1.5rem;
  padding: 1.25rem;
  border: 1px solid rgba(53, 242, 208, 0.35);
  background: linear-gradient(135deg, rgba(53, 242, 208, 0.1), rgba(22, 35, 44, 0.92));
}

.page-faq .faq-contact p {
  margin: 0;
  max-width: 56ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--paper);
}

/* ---------- 折叠面板 ---------- */
.page-faq .faq-qa {
  margin-top: 1.5rem;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-item__q {
  position: relative;
  display: block;
  cursor: pointer;
  list-style: none;
  padding: 1.05rem 2.25rem 1.05rem 0.85rem;
  font-size: 0.9688rem;
  font-weight: 500;
  line-height: 1.6;
  color: var(--paper);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

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

.page-faq .faq-item__q::after {
  content: "+";
  position: absolute;
  right: 0.85rem;
  top: 0.95rem;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--cyan);
  transition: transform 0.18s var(--ease);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "–";
}

.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible {
  color: var(--mint);
  background: rgba(53, 242, 208, 0.06);
  outline: none;
}

.page-faq .faq-item[open] .faq-item__q {
  color: var(--mint);
  background: rgba(53, 242, 208, 0.05);
}

.page-faq .faq-item[open] .faq-item__q::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8rem;
  bottom: 0.8rem;
  width: 3px;
  background: var(--orange);
}

.page-faq .faq-item__a {
  padding: 0.1rem 1.1rem 1.4rem 0.95rem;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 66ch;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--faq-body-text);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-quicklist {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-contact {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    justify-items: stretch;
  }

  .page-faq .faq-contact .btn {
    justify-self: end;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-faq .faq-quicklist {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-faq .faq-index {
    position: sticky;
    top: 5.5rem;
    align-self: start;
    padding: 1.1rem 1rem 1.2rem;
  }

  .page-faq .faq-index__list {
    display: grid;
    gap: 0.15rem;
    overflow: visible;
    padding: 0;
  }

  .page-faq .faq-index__link {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 0.5rem;
    white-space: normal;
    border-color: transparent;
    padding: 0.45rem 0.25rem;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    border-color: transparent;
    color: var(--mint);
  }

  .page-faq .faq-version {
    grid-template-columns: 6.5rem 4rem minmax(0, 1fr);
    align-items: baseline;
  }

  .page-faq .faq-version__desc {
    grid-column: 3;
  }

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

  .page-faq .faq-item__q {
    padding-left: 1.05rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-quick,
  .page-faq .faq-quick::before,
  .page-faq .faq-item__q,
  .page-faq .faq-index__link {
    transition: none;
  }
}