.page-faq {
  --faq-rule: rgba(16, 24, 40, 0.14);
  --faq-rule-strong: rgba(16, 24, 40, 0.28);
  --faq-rule-dark: rgba(0, 229, 255, 0.24);
  --faq-sticky-top: 6.5rem;
  background: var(--paper);
  color: var(--ink);
}

.page-faq .faq-crumb-bar {
  background: var(--paper);
  padding: 1rem 0 0;
}

.page-faq .faq-crumb-bar .breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-faq .faq-crumb-bar .breadcrumb a {
  color: var(--teal);
  text-decoration: none;
}

.page-faq .faq-crumb-bar .breadcrumb a:hover {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--indigo-900);
  padding: clamp(2.25rem, 6vw, 4.5rem) 0 clamp(2.5rem, 7vw, 5rem);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.07) 1px, transparent 1px);
  background-size: 72px 72px;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -8rem;
  top: -8rem;
  width: 22rem;
  height: 22rem;
  border-radius: 50%;
  border: 1px solid var(--faq-rule-dark);
  box-shadow: 0 0 0 40px rgba(0, 229, 255, 0.03), 0 0 0 80px rgba(0, 229, 255, 0.02);
  pointer-events: none;
}

.page-faq .faq-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
  align-items: end;
}

.page-faq .faq-hero-copy .section-label {
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0 0 1rem;
}

.page-faq .faq-hero-copy h1 {
  color: var(--white);
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.4vw, 3.6rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 1.25rem;
  max-width: 22ch;
}

.page-faq .faq-hero-copy .lede {
  color: rgba(255, 255, 255, 0.82);
  font-size: 1rem;
  line-height: 1.85;
  margin: 0 0 1.75rem;
  max-width: 54ch;
}

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

.page-faq .faq-hero-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.55);
  margin: 0;
  padding-top: 1rem;
  border-top: 1px solid var(--faq-rule-dark);
}

.page-faq .faq-hero-figure {
  margin: 0;
  border: 1px solid var(--faq-rule-dark);
  background: var(--indigo-700);
  aspect-ratio: 1 / 1;
  max-width: 25rem;
  width: 100%;
  overflow: hidden;
}

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

/* ---------- 高频六问 ---------- */

.page-faq .faq-hot {
  padding-top: clamp(2.5rem, 6vw, 4rem);
  padding-bottom: clamp(2rem, 5vw, 3rem);
}

.page-faq .faq-hot-head {
  margin-bottom: 1.5rem;
}

.page-faq .faq-hot-head .section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 0.6rem;
}

.page-faq .faq-hot-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--ink);
}

.page-faq .faq-hot-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--faq-rule);
  border: 1px solid var(--faq-rule);
}

.page-faq .faq-hot-list li a {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.5rem 0.9rem;
  padding: 1rem 1.1rem;
  background: var(--white);
  color: var(--ink);
  text-decoration: none;
  transition: background-color 160ms ease, box-shadow 160ms ease;
}

.page-faq .faq-hot-list li a:hover,
.page-faq .faq-hot-list li a:focus-visible {
  background: #FBFCFE;
  box-shadow: inset 3px 0 0 var(--cyan);
}

.page-faq .faq-hot-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--teal);
  border: 1px solid rgba(0, 107, 122, 0.3);
  padding: 0.2rem 0.45rem;
  white-space: nowrap;
  align-self: center;
}

.page-faq .faq-hot-q {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.55;
  min-width: 0;
}

.page-faq .faq-hot-arrow {
  font-family: var(--font-mono);
  color: var(--amber);
  font-size: 1rem;
  line-height: 1;
}

/* ---------- 分类索引 ---------- */

.page-faq .faq-index {
  padding-top: clamp(1.5rem, 4vw, 2rem);
  padding-bottom: clamp(2.5rem, 6vw, 3.5rem);
}

.page-faq .faq-index-head {
  margin-bottom: 1.75rem;
}

.page-faq .faq-index-head .section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 0.6rem;
}

.page-faq .faq-index-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 0.6rem;
}

.page-faq .faq-index-sub {
  margin: 0;
  color: var(--slate);
  font-size: 0.92rem;
  line-height: 1.7;
  max-width: 48ch;
}

.page-faq .faq-index-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--faq-rule);
  border: 1px solid var(--faq-rule);
}

.page-faq .faq-index-card {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 1.5rem 1.35rem;
  background: var(--white);
  text-decoration: none;
  color: var(--ink);
  border-left: 3px solid transparent;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.page-faq .faq-index-card:hover,
.page-faq .faq-index-card:focus-visible {
  border-left-color: var(--amber);
  background: #FCFDFE;
}

.page-faq .faq-index-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  background: var(--indigo-900);
  padding: 0.2rem 0.5rem;
  align-self: flex-start;
}

.page-faq .faq-index-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-faq .faq-index-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--slate);
}

.page-faq .faq-index-count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--teal);
  margin-top: 0.25rem;
}

/* ---------- 主体双栏 ---------- */

.page-faq .faq-main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: start;
  padding-top: clamp(1rem, 3vw, 2rem);
  padding-bottom: clamp(3rem, 7vw, 4.5rem);
}

.page-faq .faq-side-mobile {
  border: 1px solid var(--faq-rule);
  background: var(--white);
}

.page-faq .faq-side-mobile > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal);
}

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

.page-faq .faq-side-mobile > summary::after {
  content: "＋";
  color: var(--amber);
  font-size: 1rem;
}

.page-faq .faq-side-mobile[open] > summary::after {
  content: "－";
}

.page-faq .faq-side-mobile .faq-side-list {
  padding: 0 1.1rem 1.1rem;
}

.page-faq .faq-side {
  display: none;
}

.page-faq .faq-side-inner {
  border-top: 2px solid var(--indigo-900);
  padding-top: 1rem;
}

.page-faq .toc-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 0 0 0.9rem;
}

.page-faq .faq-side-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: side;
}

.page-faq .faq-side-list li {
  counter-increment: side;
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-side-list li a {
  display: block;
  padding: 0.7rem 0 0.7rem 2rem;
  position: relative;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.9rem;
  line-height: 1.5;
  transition: color 160ms ease;
}

.page-faq .faq-side-list li a::before {
  content: counter(side, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.78rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--slate);
  letter-spacing: 0.04em;
}

.page-faq .faq-side-list li a:hover,
.page-faq .faq-side-list li a:focus-visible {
  color: var(--teal);
}

.page-faq .faq-side-list li a[aria-current="true"] {
  color: var(--teal);
  font-weight: 600;
  box-shadow: inset 2px 0 0 var(--cyan);
  padding-left: 0.75rem;
}

.page-faq .faq-side-list li a[aria-current="true"]::before {
  left: -1.15rem;
  color: var(--amber);
}

.page-faq .faq-side-meta {
  margin: 1.25rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  line-height: 1.9;
  color: var(--slate);
}

.page-faq .faq-side-meta .batch-tag {
  display: inline-block;
  margin-top: 0.3rem;
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  scroll-margin-top: var(--faq-sticky-top);
  padding-bottom: clamp(2.5rem, 6vw, 3.5rem);
  border-bottom: 1px solid var(--faq-rule);
  margin-bottom: clamp(2.5rem, 6vw, 3.5rem);
}

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

.page-faq .faq-group-head {
  margin-bottom: 1.5rem;
}

.page-faq .faq-group-head .section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
  background: var(--mist);
  padding: 0.3rem 0.6rem;
  margin: 0 0 0.85rem;
}

.page-faq .faq-group-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.15rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 0 0 0.7rem;
  max-width: 26ch;
}

.page-faq .faq-group-head p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--slate);
  max-width: 58ch;
}

/* ---------- 图片 ---------- */

.page-faq .faq-figure {
  margin: 0 0 1.75rem;
  border: 1px solid var(--faq-rule);
  background: var(--mist);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 12 / 7;
}

.page-faq .faq-figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--slate);
  padding: 0.65rem 0.9rem;
  border-top: 1px solid var(--faq-rule);
  background: var(--white);
}

/* ---------- 问答折叠 ---------- */

.page-faq .faq-qlist {
  counter-reset: q;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-q {
  counter-increment: q;
  scroll-margin-top: var(--faq-sticky-top);
  border-bottom: 1px solid var(--faq-rule);
  background: var(--white);
  box-shadow: inset 0 0 0 0 var(--cyan);
  transition: box-shadow 180ms ease;
}

.page-faq .faq-q[open] {
  box-shadow: inset 3px 0 0 var(--cyan);
}

.page-faq .faq-q > summary {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 1.05rem 1.1rem;
  cursor: pointer;
  list-style: none;
  transition: color 160ms ease;
}

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

.page-faq .faq-q > summary::before {
  content: "Q" counter(q, decimal-leading-zero);
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--teal);
  line-height: 1.85;
}

.page-faq .faq-q > summary::after {
  content: "＋";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1.4;
  color: var(--slate);
  transition: color 160ms ease;
}

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

.page-faq .faq-q > summary:hover .faq-q-text,
.page-faq .faq-q > summary:focus-visible .faq-q-text {
  color: var(--teal);
}

.page-faq .faq-q-text {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.7;
  color: var(--ink);
  transition: color 160ms ease;
}

.page-faq .faq-a {
  padding: 0 1.1rem 1.25rem 1.1rem;
  font-size: 0.94rem;
  line-height: 1.85;
  color: rgba(16, 24, 40, 0.82);
}

.page-faq .faq-a p {
  margin: 0 0 0.6rem;
}

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

.page-faq .faq-steps {
  counter-reset: step;
  list-style: none;
  margin: 0 0 0.85rem;
  padding: 0;
}

.page-faq .faq-steps li {
  counter-increment: step;
  position: relative;
  padding-left: 2.1rem;
  margin-bottom: 0.55rem;
  line-height: 1.8;
}

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

.page-faq .faq-steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.15em;
  width: 1.5rem;
  height: 1.5rem;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.02em;
  color: var(--teal);
  background: var(--mist);
  border: 1px solid var(--faq-rule);
}

/* ---------- 联系区块 ---------- */

.page-faq .faq-contact {
  scroll-margin-top: var(--faq-sticky-top);
  background: var(--indigo-900);
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 clamp(3rem, 7vw, 5rem);
  position: relative;
  overflow: hidden;
}

.page-faq .faq-contact::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.06) 1px, transparent 1px);
  background-size: 72px 72px;
}

.page-faq .faq-contact-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}

.page-faq .faq-contact-copy .section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 0.9rem;
}

.page-faq .faq-contact-copy h2 {
  color: var(--white);
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
  max-width: 20ch;
}

.page-faq .faq-contact-copy > p {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.95rem;
  line-height: 1.85;
  margin: 0 0 1.75rem;
  max-width: 52ch;
}

.page-faq .faq-contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--faq-rule-dark);
  border: 1px solid var(--faq-rule-dark);
}

.page-faq .faq-contact-list li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.1rem 1.15rem;
  background: rgba(19, 42, 94, 0.55);
}

.page-faq .faq-contact-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--amber);
  line-height: 1.9;
}

.page-faq .faq-contact-list strong {
  display: block;
  color: var(--white);
  font-size: 0.98rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.page-faq .faq-contact-list p {
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.86rem;
  line-height: 1.75;
}

.page-faq .faq-contact-card {
  background: var(--white);
  border-top: 3px solid var(--amber);
  padding: 1.6rem 1.35rem;
}

.page-faq .faq-contact-card .section-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 1rem;
}

.page-faq .faq-contact-dl {
  margin: 0 0 1.2rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-faq .faq-contact-dl dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--slate);
  text-transform: uppercase;
  padding-top: 0.8rem;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-contact-dl dt:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.page-faq .faq-contact-dl dd {
  margin: 0.25rem 0 0.85rem;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--ink);
  word-break: break-word;
}

.page-faq .faq-contact-dl dd a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 107, 122, 0.35);
}

.page-faq .faq-contact-dl dd a:hover,
.page-faq .faq-contact-dl dd a:focus-visible {
  color: var(--indigo-900);
  border-bottom-color: var(--amber);
}

.page-faq .faq-contact-tip {
  font-size: 0.84rem;
  line-height: 1.8;
  color: var(--slate);
  margin: 0 0 1.35rem;
  padding-top: 1rem;
  border-top: 1px solid var(--faq-rule);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-faq .faq-index-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-a {
    padding-left: 4rem;
  }

  .page-faq .faq-q > summary {
    padding-left: 1.35rem;
    padding-right: 1.35rem;
  }

  .page-faq .faq-contact-dl {
    grid-template-columns: 6.5rem minmax(0, 1fr);
    column-gap: 1rem;
    align-items: baseline;
  }

  .page-faq .faq-contact-dl dt {
    padding-top: 0;
    border-top: 0;
  }

  .page-faq .faq-contact-dl dd {
    margin: 0 0 0.85rem;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr);
    gap: 3rem;
  }

  .page-faq .faq-hero-figure {
    margin-left: auto;
  }

  .page-faq .faq-contact-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 3rem;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-main {
    grid-template-columns: 15.5rem minmax(0, 1fr);
    gap: 3.5rem;
    padding-top: 2.5rem;
  }

  .page-faq .faq-side-mobile {
    display: none;
  }

  .page-faq .faq-side {
    display: block;
  }

  .page-faq .faq-side-inner {
    position: sticky;
    top: var(--faq-sticky-top);
  }
}

@media (min-width: 1120px) {
  .page-faq .faq-index-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-hot-list li a,
  .page-faq .faq-index-card,
  .page-faq .faq-q,
  .page-faq .faq-q > summary,
  .page-faq .faq-q-text,
  .page-faq .faq-side-list li a {
    transition: none;
  }
}