.page-faq {
  --faq-card: var(--white);
  --faq-hair: var(--paper-line);
  background: var(--paper);
  color: var(--ink-soft);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  background: var(--blue-night);
  color: var(--on-night);
  padding: clamp(1.25rem, 3vw, 2rem) 0 clamp(2.25rem, 6vw, 4rem);
  overflow: hidden;
  isolation: isolate;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 76px 76px;
  opacity: 0.55;
  pointer-events: none;
}

.page-faq .hero-slash {
  position: absolute;
  top: 0;
  right: -6%;
  width: 58%;
  height: 100%;
  background: linear-gradient(135deg, rgba(33, 212, 194, 0.16), rgba(46, 155, 230, 0.06) 55%, transparent 80%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

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

.page-faq .hero-crumb .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}

.page-faq .hero-crumb .breadcrumb-list li {
  display: flex;
  align-items: baseline;
  color: var(--muted);
}

.page-faq .hero-crumb .breadcrumb-list li + li::before {
  content: "/";
  padding: 0 0.5rem;
  color: var(--line);
}

.page-faq .hero-crumb .breadcrumb-list a {
  color: var(--on-night-soft, var(--muted));
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease);
}

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

.page-faq .hero-crumb .breadcrumb-list [aria-current="page"] {
  color: var(--on-night);
}

.page-faq .hero-body {
  position: relative;
  z-index: 1;
  margin-top: clamp(1.5rem, 4vw, 2.75rem);
}

.page-faq .eyebrow {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--flag-yellow);
}

.page-faq .faq-title {
  margin: 0 0 1rem;
  max-width: 16ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 5.6vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-faq .faq-lede {
  margin: 0;
  max-width: 54ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--on-night);
}

.page-faq .hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2.75rem;
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.page-faq .hero-stat {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.page-faq .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-faq .stat-label {
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* ---------- 双栏骨架 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  padding: clamp(2rem, 5vw, 3.25rem) 0 clamp(3rem, 6vw, 5rem);
}

.page-faq .faq-index,
.page-faq .faq-flow {
  min-width: 0;
}

/* ---------- 左侧索引 ---------- */
.page-faq .faq-index-inner {
  border: 1px solid var(--faq-hair);
  background: var(--paper);
  padding: 1rem 1rem 1.25rem;
}

.page-faq .index-figure {
  margin: 0 0 1.25rem;
}

.page-faq .index-figure .figure-media {
  background: var(--blue-night);
  border: 1px solid var(--line);
  overflow: hidden;
}

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

.page-faq .index-label {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  border-bottom: 1px dashed var(--faq-hair);
  padding-bottom: 0.6rem;
}

.page-faq .faq-index-list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
}

.page-faq .faq-index-list li + li {
  margin-top: 0.15rem;
}

.page-faq .faq-index-list a {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.55rem 0.6rem 0.55rem 0.75rem;
  border-left: 2px solid var(--faq-hair);
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.9rem;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease), background 0.15s var(--ease);
}

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

.page-faq .faq-index-list a.is-current {
  border-left-color: var(--flag-yellow);
  background: var(--white);
  color: var(--ink);
}

.page-faq .faq-index-list .idx {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-faq .faq-index-list .lbl {
  flex: 1;
}

.page-faq .index-note {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px dashed var(--faq-hair);
  padding-top: 0.75rem;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  padding-bottom: clamp(1.75rem, 4vw, 2.75rem);
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
  border-bottom: 1px solid var(--faq-hair);
  scroll-margin-top: 5.5rem;
}

.page-faq .faq-group:last-of-type {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-faq .group-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.65rem 0.9rem;
  padding-bottom: 0.7rem;
  border-bottom: 2px solid var(--ink);
}

.page-faq .group-idx {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--flag-yellow);
  background: var(--ink);
  padding: 0.15rem 0.45rem;
}

.page-faq .group-title {
  margin: 0;
  flex: 1;
  min-width: 8ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.25rem, 3.2vw, 1.7rem);
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-faq .group-lede {
  margin: 0.9rem 0 1.15rem;
  max-width: 58ch;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 问答条目 ---------- */
.page-faq .qa-list {
  display: grid;
  gap: 0.6rem;
}

.page-faq .qa {
  border: 1px solid var(--faq-hair);
  border-radius: var(--r);
  background: var(--faq-card);
  position: relative;
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-faq .qa:hover {
  border-color: var(--line);
}

.page-faq .qa[open] {
  border-color: var(--cyan);
}

.page-faq .qa[open]::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 12px;
  height: 12px;
  border-top: 2px solid var(--cyan);
  border-right: 2px solid var(--cyan);
}

.page-faq .qa summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.95rem 1.1rem;
  cursor: pointer;
  list-style: none;
}

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

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

.page-faq .qa-idx {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-faq .qa-q {
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
}

.page-faq .qa-mark {
  align-self: center;
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .qa[open] .qa-mark {
  border-color: var(--cyan);
  transform: rotate(-135deg) translate(-2px, -2px);
}

.page-faq .qa-body {
  padding: 0.15rem 1.1rem 1.15rem;
  border-top: 1px dashed var(--faq-hair);
  margin-top: 0.15rem;
}

.page-faq .qa-body p {
  margin: 0.85rem 0 0;
  max-width: 62ch;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-faq .qa-steps {
  margin: 0.85rem 0 0;
  padding: 0;
  list-style: none;
  counter-reset: qa-step;
  border-left: 1px solid var(--faq-hair);
}

.page-faq .qa-steps li {
  counter-increment: qa-step;
  position: relative;
  padding: 0.35rem 0 0.35rem 1.9rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-faq .qa-steps li::before {
  content: counter(qa-step, decimal-leading-zero);
  position: absolute;
  left: 0.6rem;
  top: 0.38rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--cyan);
}

.page-faq .qa-body .btn {
  margin-top: 1rem;
}

/* ---------- 分组配图 ---------- */
.page-faq .group-figure {
  margin: 1.4rem 0 0;
}

.page-faq .group-figure .figure-media {
  background: var(--blue-night);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .figure-cap {
  margin: 0.6rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 还没解决 ---------- */
.page-faq .faq-group--night {
  background: var(--blue-night);
  border: 1px solid var(--line);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.page-faq .faq-group--night::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.5;
  pointer-events: none;
}

.page-faq .faq-group--night > * {
  position: relative;
}

.page-faq .faq-group--night .group-head {
  border-bottom-color: var(--line);
}

.page-faq .faq-group--night .group-idx {
  background: var(--flag-yellow);
  color: var(--blue-night);
}

.page-faq .faq-group--night .group-title {
  color: var(--white);
}

.page-faq .faq-group--night .group-lede {
  color: var(--on-night);
}

.page-faq .contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: 0.5rem;
}

.page-faq .contact-cell {
  background: var(--panel);
  padding: 1.1rem 1.15rem 1.25rem;
}

.page-faq .contact-key {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--flag-yellow);
}

.page-faq .contact-val {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  color: var(--white);
  word-break: break-word;
}

.page-faq .contact-val.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.page-faq .contact-hint {
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--on-night);
}

.page-faq .contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: clamp(2rem, 3.5vw, 3.5rem);
  }

  .page-faq .faq-index-inner {
    position: sticky;
    top: 5.5rem;
  }

  .page-faq .qa summary {
    padding: 1.05rem 1.35rem;
  }

  .page-faq .qa-body {
    padding: 0.25rem 1.35rem 1.35rem 4.1rem;
  }

  .page-faq .qa-body p,
  .page-faq .qa-steps {
    margin-top: 1rem;
  }

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

@media (max-width: 599px) {
  .page-faq .hero-slash {
    width: 80%;
    opacity: 0.7;
  }

  .page-faq .hero-stats {
    gap: 1rem 1.5rem;
  }

  .page-faq .qa summary {
    gap: 0.55rem;
    padding: 0.85rem 0.9rem;
  }

  .page-faq .qa-body {
    padding-left: 0.9rem;
    padding-right: 0.9rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa-mark,
  .page-faq .faq-index-list a,
  .page-faq .hero-crumb .breadcrumb-list a {
    transition: none;
  }
}