.page-faq {
  --faq-gap: 28px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 26px 0 40px;
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(123, 77, 255, 0.22), transparent 62%),
    radial-gradient(90% 80% at -10% 110%, rgba(0, 229, 208, 0.14), transparent 60%),
    var(--ink);
  border-bottom: 1px solid var(--tick);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 100%;
  background-image: repeating-linear-gradient(180deg, var(--tick) 0 1px, transparent 1px 14px);
  opacity: 0.5;
  pointer-events: none;
}

@media (min-width: 720px) {
  .page-faq .faq-hero {
    padding: 34px 0 52px;
  }

  .page-faq .faq-hero::after {
    width: 56px;
  }
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  max-width: 22ch;
  font-size: clamp(30px, 7.2vw, 54px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.page-faq .faq-lede {
  margin: 16px 0 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-faq .faq-lede {
    font-size: 17px;
  }
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  background: var(--tick);
  border: 1px solid var(--tick);
}

@media (min-width: 900px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-faq .faq-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px 16px;
  background: var(--navy);
}

.page-faq .faq-stat-num {
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--cyan);
}

@media (min-width: 900px) {
  .page-faq .faq-stat-num {
    font-size: 24px;
  }
}

.page-faq .faq-stat-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 双栏骨架 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding-top: 36px;
  padding-bottom: 64px;
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 52px;
    padding-top: 56px;
    padding-bottom: 96px;
  }
}

/* ---------- 问题目录 ---------- */
.page-faq .faq-toc {
  padding: 18px 16px;
  border: 1px solid var(--tick);
  background: var(--navy);
}

@media (min-width: 1024px) {
  .page-faq .faq-toc {
    position: sticky;
    top: 28px;
  }
}

.page-faq .faq-toc-title {
  margin: 0 0 14px;
  padding-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1.2px;
  color: var(--paper);
  border-bottom: 1px solid var(--tick);
}

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

.page-faq .faq-toc-link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 10px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-faq .faq-toc-link:hover,
.page-faq .faq-toc-link:focus-visible {
  color: var(--paper);
  border-left-color: var(--cyan);
  background: rgba(0, 229, 208, 0.07);
}

.page-faq .faq-toc-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
}

.page-faq .faq-toc-note {
  margin: 16px 0 0;
  padding-top: 14px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px dashed var(--tick);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  margin-bottom: 52px;
  scroll-margin-top: 90px;
}

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

.page-faq .faq-group-head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--tick);
}

.page-faq .faq-num {
  flex: none;
  padding: 9px 10px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  background: var(--paper);
  box-shadow: 3px 3px 0 var(--orange);
}

.page-faq .faq-group-head h2 {
  margin: 0;
  font-size: clamp(21px, 3.6vw, 28px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-faq .faq-group-sub {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-group-body {
  margin-top: 18px;
}

@media (min-width: 900px) {
  .page-faq .faq-group-body--media {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }
}

/* ---------- 可展开卡片 ---------- */
.page-faq .faq-item {
  margin-top: 10px;
  border: 1px solid var(--tick);
  border-left: 3px solid var(--tick);
  background: var(--panel);
  transition: border-left-color 0.2s var(--ease);
}

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

.page-faq .faq-item summary {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 15px 16px;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item summary::after {
  content: "+";
  flex: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.2;
  color: var(--cyan);
}

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

.page-faq .faq-item[open] > summary {
  background: linear-gradient(90deg, rgba(0, 229, 208, 0.09), rgba(0, 229, 208, 0) 62%);
}

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

.page-faq .faq-a {
  position: relative;
  padding: 0 16px 18px;
  animation: faq-open 0.28s var(--ease) both;
}

.page-faq .faq-a::before {
  content: "";
  position: absolute;
  top: 0;
  left: 16px;
  right: 16px;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), rgba(0, 229, 208, 0) 72%);
}

@keyframes faq-open {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-faq .faq-a p {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-faq .faq-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 208, 0.4);
}

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

/* ---------- 步骤列表 ---------- */
.page-faq .faq-steps {
  counter-reset: faq-step;
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-faq .faq-steps li {
  position: relative;
  counter-increment: faq-step;
  padding: 0 0 14px 40px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper);
}

.page-faq .faq-steps li::before {
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  width: 26px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 18px;
  text-align: center;
  color: var(--cyan);
  background: var(--ink);
  border: 1px solid var(--tick);
}

.page-faq .faq-steps li::after {
  content: "";
  position: absolute;
  left: 13px;
  top: 26px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--tick), rgba(42, 54, 70, 0));
}

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

.page-faq .faq-steps li:last-child::after {
  display: none;
}

/* ---------- 术语提示 ---------- */
.page-faq .kw {
  position: relative;
  color: var(--paper);
  border-bottom: 1px solid var(--cyan);
  cursor: help;
}

.page-faq .kw::after {
  content: attr(data-tip);
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  z-index: 6;
  width: max-content;
  max-width: 240px;
  padding: 8px 10px;
  font-size: 12.5px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--paper);
  background: var(--navy);
  border: 1px solid var(--cyan);
  box-shadow: 4px 4px 0 rgba(0, 229, 208, 0.18);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease), visibility 0.18s;
  pointer-events: none;
}

.page-faq .kw:hover::after,
.page-faq .kw:focus::after {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- 插图 ---------- */
.page-faq .faq-figure {
  margin: 18px 0 0;
  padding: 10px;
  border: 1px solid var(--tick);
  background: var(--navy);
}

@media (min-width: 900px) {
  .page-faq .faq-group-body--media .faq-figure {
    margin-top: 10px;
  }
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--tick);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-figure--wide {
  margin-top: 22px;
}

/* ---------- 末尾行动块 ---------- */
.page-faq .faq-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
  align-items: center;
  justify-content: space-between;
  margin-top: 20px;
  padding: 22px 20px;
  border: 1px solid var(--tick);
  background:
    linear-gradient(135deg, rgba(123, 77, 255, 0.18), rgba(0, 229, 208, 0.07) 58%, transparent),
    var(--navy);
}

.page-faq .faq-cta-text {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-cta .btn {
  flex: none;
}

@media (max-width: 599px) {
  .page-faq .faq-cta .btn {
    width: 100%;
    text-align: center;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-a {
    animation: none;
  }

  .page-faq .faq-toc-link,
  .page-faq .faq-item,
  .page-faq .kw::after {
    transition: none;
  }
}