.page-faq {
  display: block;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-faq .crumbs {
  padding-block: var(--space-3);
}

.page-faq .crumbs a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: 1px dotted var(--color-line);
}

.page-faq .crumbs a:hover,
.page-faq .crumbs a:focus-visible {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: 1px solid var(--color-contrast-line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--color-contrast-line) 62%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in srgb, var(--color-contrast-line) 62%, transparent) 1px, transparent 1px);
  background-size: 73px 73px;
  opacity: 0.42;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 7px;
  background-image: repeating-linear-gradient(
    to right,
    var(--color-contrast-line) 0 1px,
    transparent 1px 26px
  );
  opacity: 0.95;
  pointer-events: none;
}

.page-faq .faq-hero-slash {
  position: absolute;
  inset-block: 0;
  right: -12%;
  width: 62%;
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--color-contrast-accent) 22%, transparent) 0%,
    transparent 68%
  );
  clip-path: polygon(24% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  padding-block: var(--section-y);
}

.page-faq .faq-coord {
  margin: 0 0 var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
  text-transform: uppercase;
}

.page-faq .faq-title {
  margin: 0 0 var(--space-4);
  max-width: 22ch;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
  border-bottom: 3px solid var(--color-contrast-accent);
  padding-bottom: var(--space-3);
  text-wrap: balance;
}

.page-faq .faq-lede {
  margin: 0;
  max-width: 54ch;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
}

.page-faq .faq-nums {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3) var(--space-4);
  margin: var(--space-6) 0 0;
  padding-top: var(--space-4);
  border-top: 1px dotted var(--color-contrast-line);
}

.page-faq .faq-num {
  margin: 0;
  position: relative;
  padding-left: var(--space-3);
}

.page-faq .faq-num::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 3px;
  height: calc(100% - 0.7em);
  background: var(--color-contrast-accent);
}

.page-faq .faq-num-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.page-faq .faq-num-val {
  margin: var(--space-1) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1.05;
  color: var(--color-contrast-ink);
}

.page-faq .faq-hero-figure {
  position: relative;
  border: 1px solid var(--color-contrast-line);
  background: color-mix(in srgb, var(--color-contrast-surface) 70%, #000 30%);
}

.page-faq .faq-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 8;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.06);
  opacity: 0.9;
}

.page-faq .faq-hero-caption {
  margin: 0;
  padding: var(--space-2) var(--space-3);
  border-top: 1px dotted var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

/* ---------- 分组索引 ---------- */

.page-faq .faq-index {
  background: var(--color-surface-alt);
  border-bottom: 1px dotted var(--color-line);
}

.page-faq .faq-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-line);
}

.page-faq .faq-index-item {
  border-bottom: 1px dotted var(--color-line);
}

.page-faq .faq-index-link {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: var(--space-1) var(--space-3);
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-2);
  text-decoration: none;
  color: var(--color-ink);
  transition: background 0.18s ease, padding-left 0.18s ease;
}

.page-faq .faq-index-link:hover,
.page-faq .faq-index-link:focus-visible {
  background: var(--color-primary-soft);
  padding-left: var(--space-4);
}

.page-faq .faq-index-pos {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  color: var(--color-primary);
  text-align: center;
  border: 1px solid var(--color-primary);
  aligned-self: start;
  align-self: start;
}

.page-faq .faq-index-name {
  grid-column: 2;
  grid-row: 1;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}

.page-faq .faq-index-meta {
  grid-column: 2;
  grid-row: 2;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

/* ---------- 问答分组 ---------- */

.page-faq .faq-group {
  border-bottom: 1px dotted var(--color-line);
}

.page-faq .faq-group:nth-of-type(even) {
  background: var(--color-surface-alt);
}

.page-faq .faq-list {
  border-top: 1px solid var(--color-line);
}

.page-faq .faq-q {
  border-bottom: 1px dotted var(--color-line);
}

.page-faq .faq-q summary {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr) 1.4rem;
  gap: var(--space-2) var(--space-3);
  align-items: baseline;
  padding: var(--space-3) var(--space-2);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  line-height: 1.5;
  color: var(--color-ink);
  transition: background 0.18s ease, color 0.18s ease;
}

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

.page-faq .faq-q summary:hover {
  background: var(--color-primary-soft);
}

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

.page-faq .faq-q summary::after {
  content: "+";
  grid-column: 3;
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: var(--weight-body);
  line-height: 1;
  color: var(--color-primary);
  text-align: right;
}

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

.page-faq .faq-q[open] summary::after {
  content: "−";
  color: var(--color-accent);
}

.page-faq .faq-q-id {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  padding-top: 0.35em;
}

.page-faq .faq-q[open] .faq-q-id {
  color: var(--color-accent);
}

.page-faq .faq-q-text {
  grid-column: 2;
}

.page-faq .faq-a {
  margin: 0 var(--space-2) var(--space-4) calc(2.6rem + var(--space-3));
  padding-left: var(--space-4);
  border-left: 2px solid var(--color-primary);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

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

.page-faq .faq-a p + p {
  margin-top: var(--space-3);
}

.page-faq .faq-a a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 2px solid var(--color-highlight);
  padding-bottom: 1px;
}

.page-faq .faq-a a:hover,
.page-faq .faq-a a:focus-visible {
  border-bottom-color: var(--color-accent);
  color: var(--color-accent);
}

.page-faq .mark {
  background: var(--color-highlight);
  color: var(--color-ink);
  padding: 0 0.22em;
  font-weight: var(--weight-heading);
}

.page-faq .mark-line {
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 1px;
}

/* ---------- 反馈路径图 ---------- */

.page-faq .faq-figure {
  margin: var(--space-6) 0 0;
  padding: var(--space-3);
  border: 1px solid var(--color-line);
  background: var(--color-surface);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  border: 1px dotted var(--color-line);
  filter: saturate(0.8);
}

.page-faq .faq-figure-caption {
  margin: var(--space-3) 0 0;
  padding-top: var(--space-2);
  border-top: 1px dotted var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.05em;
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* ---------- 延伸入口 ---------- */

.page-faq .faq-more {
  background: var(--color-surface-deep);
}

.page-faq .faq-more-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

.page-faq .faq-more-link {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr) 1.2rem;
  gap: var(--space-3);
  align-items: start;
  height: 100%;
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-2);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-primary);
  text-decoration: none;
  color: var(--color-ink);
  transition: border-left-color 0.18s ease, background 0.18s ease;
}

.page-faq .faq-more-link:hover,
.page-faq .faq-more-link:focus-visible {
  border-left-color: var(--color-accent);
  background: var(--color-primary-soft);
}

.page-faq .faq-more-idx {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.15;
  color: var(--color-primary);
}

.page-faq .faq-more-body {
  display: block;
}

.page-faq .faq-more-name {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  margin-bottom: var(--space-1);
}

.page-faq .faq-more-desc {
  display: block;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-faq .faq-more-go {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  line-height: 1.15;
  color: var(--color-ink-muted);
  text-align: right;
}

/* ---------- 响应式 ---------- */

@media (min-width: 680px) {
  .page-faq .faq-nums {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-faq .faq-index-link {
    grid-template-columns: 3.2rem minmax(0, 1fr);
    padding-left: var(--space-3);
  }

  .page-faq .faq-q summary {
    grid-template-columns: 3.2rem minmax(0, 1fr) 1.4rem;
    padding-inline: var(--space-3);
  }

  .page-faq .faq-a {
    margin-left: calc(3.2rem + var(--space-3) + var(--space-3));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-8);
    align-items: center;
    padding-block: var(--section-y-lg);
  }

  .page-faq .faq-index-link {
    grid-template-columns: 3.2rem minmax(0, 1fr) auto;
    align-items: baseline;
  }

  .page-faq .faq-index-meta {
    grid-column: 3;
    grid-row: 1;
    text-align: right;
  }

  .page-faq .faq-q summary {
    grid-template-columns: 3.2rem minmax(0, 1fr) 1.4rem;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-more-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index-link,
  .page-faq .faq-q summary,
  .page-faq .faq-more-link {
    transition: none;
  }
}