.page-faq {
  --faq-sticky-top: 96px;
  position: relative;
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, rgba(30, 58, 82, 0.35) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 58, 82, 0.35) 1px, transparent 1px);
  background-size: 64px 64px;
  color: var(--muted);
  font-family: var(--font-body);
  line-height: 1.75;
  padding-bottom: 72px;
  overflow-x: hidden;
}

.page-faq .faq-top {
  padding-top: 22px;
}

.page-faq .breadcrumbs {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--muted-dim);
  margin-bottom: 26px;
}

.page-faq .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-faq .faq-hero {
  border-left: 4px solid var(--cyan);
  padding-left: clamp(14px, 3vw, 26px);
  padding-bottom: 10px;
}

.page-faq .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--orange);
  margin: 0 0 10px;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.85rem, 7vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 0 0 16px;
  max-width: 20ch;
}

.page-faq .faq-lead {
  max-width: 52ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--muted);
  margin: 0;
}

.page-faq .faq-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.page-faq .faq-switch__item {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--paper);
  background: var(--ink-panel);
  border: 1px solid var(--line);
  border-radius: 2px;
  text-decoration: none;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-faq .faq-switch__item:hover,
.page-faq .faq-switch__item:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-2px);
}

.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: 30px;
}

/* ---------- 目录 ---------- */
.page-faq .faq-toc {
  border: 1px solid var(--line);
  background: var(--ink-panel);
  padding: 16px 18px;
  box-shadow: var(--shadow-hard);
  scroll-margin-top: var(--faq-sticky-top);
}

.page-faq .faq-toc__title {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin: 0 0 10px;
  text-transform: uppercase;
}

.page-faq .faq-toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-toc a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  font-size: 0.88rem;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px dashed var(--line-soft);
  transition: color 0.18s var(--ease), padding-left 0.18s var(--ease);
}

.page-faq .faq-toc li:last-child a {
  border-bottom: 0;
}

.page-faq .faq-toc a:hover,
.page-faq .faq-toc a:focus-visible {
  color: var(--paper);
  padding-left: 6px;
}

.page-faq .faq-toc__num {
  flex: none;
  font-size: 0.72rem;
  color: var(--cyan);
}

/* ---------- 正文段落 ---------- */
.page-faq .faq-sec {
  border-top: 1px solid var(--line);
  padding: 26px 0 8px;
  scroll-margin-top: var(--faq-sticky-top);
}

.page-faq .faq-sec:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-faq .faq-sec__kicker {
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--orange);
  margin: 0 0 8px;
}

.page-faq .faq-sec h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.28rem, 4.4vw, 1.9rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0 0 10px;
  max-width: 24ch;
}

.page-faq .faq-sec__intro {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 18px;
  max-width: 56ch;
}

/* ---------- 检查项 ---------- */
.page-faq .faq-checks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-faq .faq-checks li {
  display: flex;
  gap: 12px;
  padding: 13px 15px;
  background: var(--ink-panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  transition: border-left-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-faq .faq-checks li:hover {
  border-left-color: var(--orange);
  transform: translateX(2px);
}

.page-faq .faq-checks h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--paper);
  margin: 0 0 4px;
}

.page-faq .faq-checks p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-check__num {
  flex: none;
  font-size: 0.76rem;
  color: var(--cyan);
  padding-top: 3px;
}

/* ---------- 设备分组 ---------- */
.page-faq .faq-device {
  margin-top: 22px;
}

.page-faq .faq-device h3 {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--paper);
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-device h3::before {
  content: "";
  width: 9px;
  height: 9px;
  background: var(--cyan);
  flex: none;
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-q {
  background: var(--ink-panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  margin-bottom: 8px;
  scroll-margin-top: var(--faq-sticky-top);
  transition: border-left-color 0.18s var(--ease);
}

.page-faq .faq-q[open] {
  border-left-color: var(--orange);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-q summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 13px 42px 13px 15px;
  font-size: 0.93rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
}

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

.page-faq .faq-q summary::after {
  content: "+";
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--cyan);
}

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

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

.page-faq .faq-q summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}

.page-faq .faq-a {
  padding: 12px 15px 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--muted);
}

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

.page-faq .faq-a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 208, 0.4);
}

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

/* ---------- 步骤列表 ---------- */
.page-faq .faq-steps {
  list-style: none;
  counter-reset: faqstep;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-faq .faq-steps li {
  counter-increment: faqstep;
  position: relative;
  padding-left: 34px;
  font-size: 0.88rem;
  line-height: 1.7;
}

.page-faq .faq-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--orange);
  border: 1px solid var(--line);
  padding: 1px 4px;
}

/* ---------- 提示条 ---------- */
.page-faq .faq-note {
  margin: 16px 0 0;
  padding: 11px 15px;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--paper);
  background: rgba(255, 106, 61, 0.1);
  border-left: 3px solid var(--orange);
}

.page-faq .faq-note a {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 106, 61, 0.5);
}

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

/* ---------- 联系信息 ---------- */
.page-faq .faq-contact {
  margin-top: 18px;
  padding: 16px 18px;
  background: var(--ink-deep);
  border: 1px solid var(--line);
}

.page-faq .faq-contact__line {
  margin: 0 0 8px;
  font-size: 0.9rem;
  color: var(--paper);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
}

.page-faq .faq-contact__line .mono {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  border: 1px solid var(--line);
  padding: 1px 6px;
}

.page-faq .faq-contact__note {
  margin: 10px 0 0;
  font-size: 0.83rem;
  line-height: 1.7;
  color: var(--muted-dim);
}

/* ---------- 下一步入口 ---------- */
.page-faq .faq-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 20px;
}

.page-faq .faq-next a {
  display: block;
  padding: 15px 16px;
  background: var(--ink-panel);
  border: 1px solid var(--line);
  text-decoration: none;
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease), background 0.18s var(--ease);
}

.page-faq .faq-next a:hover,
.page-faq .faq-next a:focus-visible {
  border-color: var(--cyan);
  background: var(--ink-deep);
  transform: translateY(-2px);
}

.page-faq .faq-next strong {
  display: block;
  font-family: var(--font-display);
  font-size: 0.93rem;
  color: var(--paper);
  margin-bottom: 5px;
}

.page-faq .faq-next span {
  font-size: 0.83rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-faq .faq-back {
  margin: 22px 0 0;
}

.page-faq .faq-back a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 208, 0.4);
  padding-bottom: 2px;
}

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

/* ---------- 图片 ---------- */
.page-faq .media {
  margin: 0 0 6px;
}

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

.page-faq .media__caption {
  margin: 10px 0 20px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.02em;
  color: var(--muted-dim);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-checks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-faq .faq-sec {
    padding: 34px 0 10px;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: 262px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

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

  .page-faq .faq-hero h1 {
    max-width: 22ch;
  }

  .page-faq .faq-sec h2 {
    max-width: 26ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-switch__item,
  .page-faq .faq-checks li,
  .page-faq .faq-next a,
  .page-faq .faq-toc a {
    transition: none;
  }

  .page-faq .faq-switch__item:hover,
  .page-faq .faq-checks li:hover,
  .page-faq .faq-next a:hover {
    transform: none;
  }
}