.page-faq {
  --faq-rail: 250px;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 6vw, 54px) 0 clamp(32px, 7vw, 66px);
  background:
    radial-gradient(130% 100% at 92% 0%, rgba(61, 240, 196, 0.14), transparent 60%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -22%;
  width: min(560px, 78%);
  height: 320px;
  background: linear-gradient(120deg, rgba(255, 122, 47, 0.2), rgba(255, 122, 47, 0) 72%);
  clip-path: polygon(0 46%, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-faq .faq-hero h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(38px, 10vw, 62px);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-faq .faq-hero__sub {
  margin: 12px 0 0;
  max-width: 24ch;
  font-family: var(--font-display);
  font-size: clamp(18px, 4.4vw, 26px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--cyan);
}

.page-faq .faq-hero .lede {
  margin-top: 18px;
  max-width: 62ch;
  color: var(--text-soft);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 12px;
  margin: 30px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-faq .faq-stats li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-faq .faq-stats__num {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-stats__label {
  font-size: 13px;
  color: var(--gray);
}

/* ---------- 更新概览 ---------- */
.page-faq .faq-update__head .lede {
  margin-top: 14px;
  max-width: 68ch;
}

.page-faq .faq-update__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 30px;
}

.page-faq .faq-update__notes {
  display: grid;
  gap: 14px;
}

.page-faq .faq-note {
  margin: 0;
  padding: 6px 0 6px 16px;
  border-left: 2px solid var(--cyan-deep);
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 目录 + 问答主体 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-faq .faq-index {
  padding: 18px 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: linear-gradient(160deg, rgba(18, 48, 38, 0.72), rgba(8, 24, 20, 0.94));
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.page-faq .faq-index__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 8px;
  border-radius: 10px;
  font-size: 15px;
  color: var(--chalk);
  text-decoration: none;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  background: rgba(61, 240, 196, 0.1);
  color: var(--cyan);
}

.page-faq .faq-index__no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan-deep);
}

.page-faq .faq-index__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gray);
}

.page-faq .faq-index__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--gray);
}

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

.page-faq .faq-part {
  margin-bottom: 58px;
  scroll-margin-top: 100px;
}

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

.page-faq .faq-part__head {
  padding-top: 18px;
  margin-bottom: 20px;
  border-top: 2px solid var(--cyan);
}

.page-faq .faq-part__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-faq .faq-part__title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 5.4vw, 32px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-faq .faq-part__desc {
  margin: 10px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-faq .faq-figure {
  margin: 22px 0 20px;
}

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

/* ---------- 问答折叠 ---------- */
.page-faq .faq-list {
  border-top: 1px solid var(--line);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
  transition: background-color 0.18s ease;
}

.page-faq .faq-item[open] {
  background: linear-gradient(180deg, rgba(18, 48, 38, 0.5), rgba(18, 48, 38, 0));
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 6px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--chalk);
  transition: color 0.18s ease;
}

.page-faq .faq-item > summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item > summary:hover,
.page-faq .faq-item > summary:focus-visible {
  color: var(--cyan);
}

.page-faq .faq-item > summary::after {
  content: "+";
  flex: 0 0 auto;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.2;
  color: var(--cyan);
  transition: transform 0.2s ease;
}

.page-faq .faq-item[open] > summary::after {
  transform: rotate(45deg);
}

.page-faq .faq-item__no {
  flex: 0 0 auto;
  min-width: 22px;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gray);
}

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

.page-faq .faq-item__a {
  padding: 0 6px 18px 40px;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-faq .faq-item__a code {
  padding: 1px 5px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--cyan);
  background: rgba(61, 240, 196, 0.09);
}

.page-faq .faq-item__a a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 筛选维度示意带 ---------- */
.page-faq .faq-filterband {
  margin: 22px 0 20px;
  padding: 16px 14px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: linear-gradient(135deg, rgba(18, 48, 38, 0.62), rgba(8, 24, 20, 0.92));
  overflow: hidden;
}

.page-faq .faq-filterband svg {
  display: block;
  width: 100%;
  height: auto;
  min-width: 640px;
}

.page-faq .faq-filterband {
  overflow-x: auto;
}

.page-faq .band-bg {
  fill: rgba(4, 13, 11, 0.55);
}

.page-faq .band-axis {
  stroke: var(--line-strong);
  stroke-width: 1;
}

.page-faq .band-chip rect {
  fill: rgba(61, 240, 196, 0.07);
  stroke: rgba(61, 240, 196, 0.3);
  stroke-width: 1;
}

.page-faq .band-chip.is-active rect {
  fill: rgba(61, 240, 196, 0.22);
  stroke: var(--cyan);
}

.page-faq .band-label {
  fill: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 15px;
  text-anchor: middle;
}

.page-faq .band-chip.is-active .band-label {
  fill: var(--chalk);
}

.page-faq .band-hint {
  fill: var(--gray);
  font-family: var(--font-mono);
  font-size: 13px;
}

/* ---------- 联系收尾 ---------- */
.page-faq .faq-help__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-faq .faq-help__text .lede {
  margin-top: 14px;
  max-width: 60ch;
}

.page-faq .faq-help__list {
  display: grid;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-help__list li {
  position: relative;
  padding-left: 22px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-faq .faq-help__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 2px;
  background: var(--orange);
}

.page-faq .faq-help__links {
  margin: 20px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-mid);
}

.page-faq .faq-help__links a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-help__card {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: linear-gradient(150deg, rgba(18, 48, 38, 0.78), rgba(8, 24, 20, 0.95));
}

.page-faq .faq-help__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.page-faq .faq-help__value {
  margin: 5px 0 16px;
  font-family: var(--font-mono);
  font-size: 16.5px;
  line-height: 1.5;
  color: var(--chalk);
  word-break: break-all;
}

.page-faq .faq-help__meta {
  margin: 0 0 18px;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--text-mid);
}

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

  .page-faq .faq-item__a {
    padding-left: 44px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-update__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-faq .faq-help__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 104px;
  }
}

@media (max-width: 560px) {
  .page-faq .faq-item > summary {
    font-size: 15.5px;
    padding: 14px 2px;
  }

  .page-faq .faq-item__a {
    padding: 0 2px 16px 2px;
  }

  .page-faq .faq-item__no {
    min-width: 18px;
  }

  .page-faq .faq-filterband svg {
    min-width: 580px;
  }
}

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