/* ==========================================================
   常见问题页 / .page-faq
   ========================================================== */

.page-faq {
  --faq-gap: clamp(30px, 4.6vw, 58px);
  --faq-fast: 0.16s cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* ---------- 首屏封面 ---------- */
.page-faq .faq-hero {
  padding-top: clamp(24px, 3.6vw, 54px);
  padding-bottom: 0;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 22px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 6vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.022em;
  max-width: 15em;
}

.page-faq .faq-hero__lede {
  max-width: 44em;
  padding-left: 18px;
  border-left: 3px solid var(--lime);
  color: var(--cold);
  font-size: clamp(15px, 1.3vw, 18px);
  line-height: 1.8;
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(26px, 3.4vw, 40px);
  padding-top: 20px;
  border-top: 3px solid var(--line);
}

.page-faq .faq-jump__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 15px;
  border: 3px solid var(--line);
  background: var(--deep);
  color: var(--cold);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: border-color var(--faq-fast), color var(--faq-fast), transform var(--faq-fast);
}

.page-faq .faq-jump__num {
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: 0.04em;
}

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

/* ---------- 分组骨架 ---------- */
.page-faq .faq-group {
  padding: var(--faq-gap) 0;
  border-top: 3px solid var(--line);
}

.page-faq .faq-group-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  margin-bottom: clamp(20px, 2.6vw, 32px);
}

.page-faq .faq-group-head__num {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  background: var(--lime);
  padding: 7px 10px;
  box-shadow: 4px 4px 0 var(--lime-deep);
}

.page-faq .faq-group-head__body h2 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 3vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.012em;
}

.page-faq .faq-group-head__body p {
  margin: 0;
  max-width: 54em;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
}

/* ---------- 三步路径 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(20px, 2.6vw, 30px);
}

.page-faq .faq-steps {
  list-style: none;
  margin: 0 0 clamp(22px, 2.8vw, 34px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border: 3px solid var(--line);
  background: var(--deep);
}

.page-faq .faq-step {
  padding: 20px 20px 22px;
  border-bottom: 3px solid var(--line);
}

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

.page-faq .faq-step__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.page-faq .faq-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.35;
}

.page-faq .faq-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--cold);
}

/* ---------- 问答组 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 12px;
}

.page-faq .faq-item {
  border: 3px solid var(--line);
  background: var(--deep);
  transition: border-color var(--faq-fast), transform var(--faq-fast);
}

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

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.5;
  color: var(--paper);
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__mark {
  position: relative;
  width: 22px;
  height: 22px;
  flex: none;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--lime);
  transition: transform var(--faq-fast), opacity var(--faq-fast);
}

.page-faq .faq-item__mark::before {
  left: 0;
  top: 10px;
  width: 22px;
  height: 3px;
}

.page-faq .faq-item__mark::after {
  left: 10px;
  top: 0;
  width: 3px;
  height: 22px;
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-item__a {
  padding: 16px 18px 20px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.82;
  color: var(--cold);
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 44em;
}

.page-faq .faq-item__a p + p {
  margin-top: 10px;
}

.page-faq .faq-item__a a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.page-faq .faq-chip {
  display: inline-block;
  margin: 0 5px 3px 0;
  padding: 2px 8px;
  border: 2px solid var(--line);
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  vertical-align: baseline;
  white-space: nowrap;
}

.page-faq .faq-item__a .mono {
  font-family: var(--font-num);
  color: var(--paper);
  word-break: break-all;
}

/* ---------- 图文并排（下载与客户端） ---------- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.4vw, 28px);
  align-items: start;
}

.page-faq .faq-split .faq-figure {
  margin: 0;
}

.page-faq .faq-split .media-frame {
  aspect-ratio: 10 / 7;
}

/* ---------- 旁注与收尾 ---------- */
.page-faq .note {
  margin-top: clamp(20px, 2.6vw, 30px);
  font-size: 14px;
  line-height: 1.75;
}

.page-faq .note .mono {
  font-family: var(--font-num);
  color: var(--paper);
  word-break: break-all;
}

.page-faq .faq-cta {
  border-top: 3px solid var(--line);
}

.page-faq .faq-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  align-items: center;
  padding: clamp(24px, 3.4vw, 42px) clamp(18px, 2.6vw, 34px);
  border: 3px solid var(--lime);
  background: var(--deep);
  box-shadow: var(--shadow-card);
}

.page-faq .faq-cta__text h2 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(20px, 2.6vw, 32px);
  line-height: 1.2;
}

.page-faq .faq-cta__text p {
  margin: 0;
  max-width: 42em;
  color: var(--cold);
  font-size: 15px;
  line-height: 1.75;
}

.page-faq .faq-cta__inner .btn {
  justify-self: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 860px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-step {
    border-bottom: 0;
    border-right: 3px solid var(--line);
  }

  .page-faq .faq-step:last-child {
    border-right: 0;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
  }

  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .page-faq .faq-cta__inner .btn {
    justify-self: end;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-item__q {
    padding: 18px 22px;
  }

  .page-faq .faq-item__a {
    padding: 18px 22px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-jump__link,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after {
    transition: none;
  }

  .page-faq .faq-jump__link:hover,
  .page-faq .faq-jump__link:focus-visible {
    transform: none;
  }
}