.page-faq {
  --faq-rule: 1px solid rgba(199, 206, 216, 0.16);
  --faq-gap: 22px;
  --faq-sticky-top: 92px;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-top: 28px;
  background: var(--grad-night);
  border-bottom: var(--edge-strong);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    180deg,
    rgba(199, 206, 216, 0.055) 0 1px,
    transparent 1px 5px
  );
}

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

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 8vw, 58px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--white);
  margin: 12px 0 16px;
  max-width: 24ch;
}

.page-faq .faq-hero .lede {
  max-width: 42ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-faq .faq-hero-figure {
  margin: 30px 0 0;
  border: var(--edge-strong);
  border-bottom: 0;
  background: var(--panel-deep);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

/* ---------- 分组索引条 ---------- */
.page-faq .faq-index {
  background: var(--panel-deep);
  border-bottom: var(--edge-strong);
}

.page-faq .faq-index-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 14px 0;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-index-list li {
  flex: none;
}

.page-faq .faq-index-list a {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid rgba(199, 206, 216, 0.2);
  border-radius: var(--radius);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

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

.page-faq .faq-index-list a[aria-current="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-layout {
  align-items: start;
  row-gap: 28px;
}

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

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

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 96px;
}

.page-faq .faq-group + .faq-group,
.page-faq .faq-group + .faq-figure {
  margin-top: 30px;
  padding-top: 30px;
  border-top: var(--faq-rule);
}

.page-faq .faq-group-head {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.page-faq .faq-num {
  flex: none;
  font-family: var(--font-serif);
  font-size: clamp(48px, 13vw, 88px);
  line-height: 0.78;
  color: var(--cyan-deep);
  opacity: 0.6;
  transform: translateY(-2px);
  user-select: none;
}

.page-faq .faq-group-meta {
  min-width: 0;
  padding-top: 4px;
}

.page-faq .faq-group-idx {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-faq .faq-group-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 4.6vw, 30px);
  line-height: 1.22;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-faq .faq-group-lede {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-list {
  margin-top: 18px;
  border-top: var(--hairline);
}

.page-faq .faq-item {
  border-bottom: var(--hairline);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 2px;
  list-style: none;
  cursor: pointer;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.7;
  color: var(--text);
  transition: color 0.2s var(--ease);
}

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

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

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

.page-faq .faq-arrow {
  flex: none;
  margin-top: 6px;
  margin-left: auto;
  color: var(--muted);
  transition: transform 0.24s var(--ease), color 0.24s var(--ease);
}

.page-faq .faq-item[open] .faq-arrow {
  transform: rotate(180deg);
  color: var(--cyan);
}

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

.page-faq .faq-a {
  margin: 0 0 18px 2px;
  padding-left: 16px;
  border-left: 2px solid var(--cyan-deep);
}

.page-faq .faq-a p {
  margin: 0 0 10px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

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

.page-faq .faq-steps {
  margin: 0 0 10px;
  padding: 0;
  list-style: none;
  counter-reset: faq-step;
}

.page-faq .faq-steps li {
  position: relative;
  counter-increment: faq-step;
  padding-left: 36px;
  margin-bottom: 9px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--silver);
}

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

.page-faq .faq-steps li::before {
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 3px;
  padding: 1px 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  border: 1px solid var(--cyan-deep);
  border-radius: var(--radius);
}

/* ---------- 章节插图 ---------- */
.page-faq .faq-figure {
  margin: 30px 0 0;
  border: var(--edge);
  border-radius: var(--radius);
  background: var(--panel-deep);
  overflow: hidden;
}

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

.page-faq .faq-figure .media-cap {
  margin: 0;
  padding: 10px 14px;
  border-top: var(--hairline);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 联系路径 ---------- */
.page-faq .faq-contact {
  margin-top: 18px;
  border-top: var(--hairline);
}

.page-faq .faq-contact-row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: var(--hairline);
}

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

.page-faq .faq-contact-row .contact-value {
  font-size: 15px;
  line-height: 1.72;
  color: var(--text);
  word-break: break-word;
}

.page-faq .faq-contact-row .contact-value a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 214, 0.4);
}

.page-faq .faq-contact-row .contact-value a:hover {
  border-bottom-color: var(--cyan);
}

.page-faq .faq-note {
  margin: 16px 0 0;
  padding: 12px 14px;
  font-family: var(--font-serif);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
  border-left: 2px solid var(--yellow);
  background: rgba(255, 176, 32, 0.06);
}

.page-faq .faq-more {
  margin: 34px 0 0;
  padding-top: 20px;
  border-top: var(--edge-strong);
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-faq .faq-more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 214, 0.4);
}

.page-faq .faq-more a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 侧栏 ---------- */
.page-faq .faq-sticky {
  position: static;
}

.page-faq .faq-helpcard {
  padding: 22px 20px;
  border: var(--edge-strong);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-soft);
}

.page-faq .faq-help-kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-faq .faq-help-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-faq .faq-help-text {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver);
}

.page-faq .faq-help-actions {
  display: grid;
  gap: 10px;
}

.page-faq .faq-help-actions .btn {
  width: 100%;
  justify-content: center;
  text-align: center;
}

.page-faq .faq-help-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: var(--hairline);
}

.page-faq .faq-help-stats div {
  min-width: 0;
}

.page-faq .faq-help-stats dt {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 4px;
}

.page-faq .faq-help-stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.4;
  color: var(--cyan);
}

.page-faq .faq-aside-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-aside-note a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid rgba(199, 206, 216, 0.35);
}

.page-faq .faq-aside-note a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-hero-figure img {
    aspect-ratio: 8 / 3;
  }

  .page-faq .faq-contact-row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

  .page-faq .faq-contact-row .contact-label {
    padding-top: 2px;
  }

  .page-faq .faq-hero h1 {
    margin-top: 16px;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-sticky {
    position: sticky;
    top: var(--faq-sticky-top);
  }

  .page-faq .faq-aside {
    padding-top: 6px;
  }

  .page-faq .faq-group-head {
    gap: 18px;
  }

  .page-faq .faq-hero {
    padding-top: 40px;
  }
}

@media (max-width: 719px) {
  .page-faq .faq-hero-figure {
    box-shadow: var(--shadow-soft);
  }

  .page-faq .faq-group + .faq-group,
  .page-faq .faq-group + .faq-figure {
    margin-top: 26px;
    padding-top: 26px;
  }

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