.page-faq {
  --faq-line: 3px solid var(--ink-900);
  --faq-line-dark: 3px solid var(--ink-700);
  background: var(--snow);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: var(--faq-line);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0 0 0 auto;
  width: 46%;
  background: var(--ink-700);
  clip-path: polygon(38% 0, 100% 0, 100% 100%, 0 100%);
  opacity: .55;
  pointer-events: none;
}

.page-faq .faq-hero .breadcrumb {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(.9rem, 3vw, 1.8rem);
}

.page-faq .faq-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 5vw, 3rem);
  padding: clamp(1.75rem, 5vw, 3rem) 0 clamp(3rem, 8vw, 6rem);
}

.page-faq .faq-hero-copy h1 {
  overflow-wrap: break-word;
}

.page-faq .faq-hero-copy .lede {
  margin-top: clamp(.9rem, 2.4vw, 1.5rem);
  max-width: 62ch;
}

.page-faq .faq-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  border: var(--faq-line-dark);
  background: rgba(5, 13, 28, .74);
  box-shadow: 7px 7px 0 var(--signal);
}

.page-faq .faq-stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .3rem 1rem;
  padding: .9rem 1.05rem;
  border-bottom: var(--faq-line-dark);
}

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

.page-faq .faq-stat-label {
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-stat-value {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--signal);
  min-width: 0;
  overflow-wrap: anywhere;
}

/* ---------- 主体画布 ---------- */

.page-faq .faq-main {
  padding: var(--band) 0;
}

.page-faq .faq-index {
  align-self: start;
  display: grid;
  gap: 1.4rem;
}

.page-faq .faq-toc {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--faq-line);
}

.page-faq .faq-toc > li {
  border-bottom: 1px solid var(--mist);
}

.page-faq .faq-toc .toc-link {
  color: var(--ink-800);
  font-weight: 500;
  line-height: 1.45;
}

.page-faq .faq-toc-num {
  display: inline-block;
  min-width: 2em;
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 700;
  color: var(--rock);
}

.page-faq .faq-sidetip {
  padding: 1rem 1.1rem 1.15rem;
  background: var(--snow);
}

.page-faq .faq-sidetip-title {
  margin: 0 0 .65rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--ink-700);
}

.page-faq .faq-sidetip-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .55rem;
  font-size: .9rem;
  line-height: 1.55;
}

.page-faq .faq-sidetip-list a {
  color: var(--ink-800);
  text-decoration: none;
  border-bottom: 2px solid var(--mist);
}

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

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  scroll-margin-top: 8rem;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(2.5rem, 6vw, 4.5rem);
}

.page-faq .faq-group-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .3rem .85rem;
  padding: .85rem 1.1rem;
  background: var(--mist);
  border: var(--faq-line);
  border-left-width: 10px;
}

.page-faq .faq-group-num {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ink-800);
}

.page-faq .faq-group-title {
  flex: 1 1 auto;
  margin: 0;
  font-size: clamp(1.08rem, 2.6vw, 1.5rem);
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--ink-900);
}

.page-faq .faq-group-meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .07em;
  color: var(--ink-700);
}

/* ---------- 图片 ---------- */

.page-faq .faq-figure {
  margin: 1.3rem 0 1.5rem;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: var(--faq-line);
  background: var(--ink-900);
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  margin-top: .6rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .02em;
  line-height: 1.6;
  color: var(--rock);
}

.page-faq .faq-figure--side {
  margin-top: 1.4rem;
}

/* ---------- 问答列 ---------- */

.page-faq .faq-list {
  margin-top: 1.15rem;
  display: grid;
  gap: .65rem;
}

.page-faq .faq-item {
  border: var(--faq-line);
  background: #ffffff;
}

.page-faq .faq-item[open] {
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-item > summary {
  padding: .95rem 1.1rem;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink-900);
}

.page-faq .faq-item > summary:hover {
  background: rgba(63, 169, 245, .09);
}

.page-faq .faq-item[open] > summary {
  background: var(--ink-800);
  color: var(--snow);
  border-bottom: var(--faq-line);
}

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

.page-faq .faq-q-num {
  display: inline-block;
  margin-right: .6rem;
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
  color: var(--rock);
}

.page-faq .faq-item[open] .faq-q-num {
  color: var(--signal);
}

.page-faq .faq-body {
  padding: 1rem 1.1rem 1.15rem;
  background: #ffffff;
}

.page-faq .faq-item[open] > .faq-body {
  animation: page-faq-reveal 180ms var(--ease) both;
}

@keyframes page-faq-reveal {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-faq .faq-body p {
  margin: 0;
  max-width: 68ch;
  line-height: 1.75;
  color: var(--graphite);
}

.page-faq .faq-body a {
  color: var(--ink-700);
  text-decoration: none;
  border-bottom: 2px solid var(--ice);
}

.page-faq .faq-body a:hover,
.page-faq .faq-body a:focus-visible {
  color: var(--ice);
}

.page-faq .faq-body .copy-btn {
  margin-top: .9rem;
}

/* ---------- 电脑端双栏 ---------- */

.page-faq .faq-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.4rem;
}

.page-faq .faq-split .faq-list {
  margin-top: 1.15rem;
}

/* ---------- 联系卡片 ---------- */

.page-faq .faq-contact-card {
  margin-top: 1.5rem;
  padding: clamp(1.2rem, 3vw, 2rem);
  background: var(--ink-800);
  color: var(--snow);
  border: var(--faq-line);
  box-shadow: 8px 8px 0 var(--signal);
}

.page-faq .faq-contact-eyebrow {
  margin: 0 0 .85rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-faq .faq-contact-steps {
  list-style: none;
  margin: 0 0 1.3rem;
  padding: 0;
  display: grid;
  gap: .5rem;
  font-size: .95rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-faq .faq-contact-steps li {
  position: relative;
  padding-left: 1.4rem;
}

.page-faq .faq-contact-steps li::before {
  content: "›";
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--signal);
}

.page-faq .faq-contact-channels {
  margin: 0;
  display: grid;
  gap: .9rem;
}

.page-faq .faq-contact-channels dt {
  margin-bottom: .3rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-contact-channels dd {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem .8rem;
}

.page-faq .faq-contact-channels .data {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--signal);
  overflow-wrap: anywhere;
}

.page-faq .faq-contact-note {
  margin: 1.3rem 0 0;
  padding-top: .95rem;
  border-top: var(--faq-line-dark);
  font-size: .92rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-contact-note a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 2px solid var(--signal);
}

/* ---------- 响应式 ---------- */

@media (max-width: 480px) {
  .page-faq .faq-hero-copy h1 {
    font-size: clamp(1.85rem, 8.6vw, 2.5rem);
  }

  .page-faq .faq-stat-value {
    font-size: 1rem;
  }

  .page-faq .faq-item > summary,
  .page-faq .faq-body {
    padding-left: .85rem;
    padding-right: .85rem;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: 62fr 38fr;
    align-items: end;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-index {
    position: sticky;
    top: 7.5rem;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-split {
    grid-template-columns: 1.5fr 1fr;
    align-items: start;
    gap: clamp(1.5rem, 3vw, 2.5rem);
  }

  .page-faq .faq-figure--side {
    margin-top: 1.15rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] > .faq-body {
    animation: none;
  }
}