/* ===== 使用指南 · 页面专属样式（作用域 .page-faq） ===== */

.page-faq {
  --faq-sticky-top: 104px;
  --faq-index-w: 340px;
  background: var(--porcelain);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumb {
  padding-top: 22px;
  padding-bottom: 14px;
}

.page-faq .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
  color: var(--slate);
}

.page-faq .breadcrumb__item a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}

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

.page-faq .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 40px 0 104px;
  background: linear-gradient(96deg, var(--deep) 0%, var(--deep-2) 56%, #1E3450 100%);
  color: var(--porcelain);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: -2%;
  right: -2%;
  bottom: -1px;
  height: 56px;
  background: var(--porcelain);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 32px;
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero .eyebrow {
  margin: 0;
  color: var(--gold-soft);
  font-size: 13px;
  letter-spacing: .18em;
}

.page-faq .faq-hero .display-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 5.4vw, 54px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--porcelain);
}

.page-faq .faq-hero__intro {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-faq .faq-quick {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-on-dark);
}

.page-faq .faq-quick__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-on-dark);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-faq .faq-quick__num {
  padding-top: 3px;
  font-size: 13px;
  color: var(--gold);
}

.page-faq .faq-hero__rule {
  height: 2px;
  margin-top: 44px;
  background: linear-gradient(90deg, var(--gold) 0%, rgba(212, 175, 55, .16) 58%, rgba(212, 175, 55, 0) 100%);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  padding: 4px 0 80px;
}

.page-faq .faq-layout {
  display: grid;
  gap: 36px;
}

.page-faq .faq-index .toc {
  border-top: 2px solid var(--deep);
  padding-top: 16px;
}

.page-faq .faq-index .toc__title {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--slate);
}

.page-faq .faq-index .toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index .toc__list li {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-index .toc__link {
  display: grid;
  grid-template-columns: 10px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 13px 2px;
  color: var(--ink);
  font-size: 15px;
  text-decoration: none;
  transition: color var(--t) var(--ease), padding-left var(--t) var(--ease);
}

.page-faq .faq-index .toc__link:hover {
  color: var(--red);
  padding-left: 8px;
}

.page-faq .faq-index__dot {
  width: 8px;
  height: 8px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: transparent;
  transition: background-color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-faq .faq-index .toc__link[aria-current="true"] {
  color: var(--red);
  font-weight: 700;
}

.page-faq .faq-index .toc__link[aria-current="true"] .faq-index__dot {
  background: var(--red);
  border-color: var(--red);
}

.page-faq .faq-index__count {
  font-size: 12px;
  color: var(--slate);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  margin-bottom: 52px;
  scroll-margin-top: 110px;
}

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

.page-faq .faq-group__head {
  margin-bottom: 18px;
}

.page-faq .faq-group__head .exhibit-tag {
  margin: 0;
  color: var(--slate);
}

.page-faq .faq-group .section-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-faq .faq-group__lead {
  max-width: 56ch;
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

.page-faq .faq-figure {
  margin: 0 0 24px;
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  border-top: 1px solid var(--line);
}

.page-faq .faq-item:last-of-type {
  border-bottom: 1px solid var(--line);
}

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

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

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 14px;
  padding: 18px 4px;
  cursor: pointer;
  list-style: none;
  transition: background-color var(--t) var(--ease);
}

.page-faq .faq-item__q:hover {
  background-color: rgba(230, 222, 210, .48);
}

.page-faq .faq-item__num {
  font-size: 13px;
  color: var(--slate);
  transition: color var(--t) var(--ease);
}

.page-faq .faq-item__text {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink);
}

.page-faq .faq-item__icon {
  position: relative;
  align-self: center;
  width: 12px;
  height: 12px;
  color: var(--slate);
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform var(--t) var(--ease), opacity var(--t) var(--ease);
}

.page-faq .faq-item__icon::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 2px;
}

.page-faq .faq-item__icon::after {
  left: 5px;
  top: 0;
  width: 2px;
  height: 12px;
}

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

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

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

.page-faq .faq-item__a {
  margin-left: 2px;
  padding: 0 8px 24px 48px;
  border-left: 2px solid transparent;
  transition: border-color var(--t) var(--ease);
}

.page-faq .faq-item[open] .faq-item__a {
  border-left-color: var(--gold);
  animation: faqReveal 220ms var(--ease) both;
}

@keyframes faqReveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .faq-item__a p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink);
}

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

.page-faq .faq-item__a a {
  color: var(--red);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}

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

.page-faq .faq-path {
  display: block;
  width: 100%;
  max-width: 360px;
  height: 34px;
  margin: 16px 0 8px;
}

.page-faq .faq-path__line {
  stroke: var(--line-strong);
  stroke-width: 1;
}

.page-faq .faq-path__dot--red {
  fill: var(--red);
}

.page-faq .faq-path__dot--gold {
  fill: var(--gold);
}

.page-faq .faq-path__dot--deep {
  fill: var(--deep);
}

.page-faq .faq-caption {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 焦点反馈 ---------- */
.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

/* ---------- 尾部行动区 ---------- */
.page-faq .faq-cta {
  position: relative;
  padding: 56px 0 60px;
  background: linear-gradient(100deg, var(--deep-2) 0%, var(--deep) 100%);
  color: var(--porcelain);
  overflow: hidden;
}

.page-faq .faq-cta::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--gold), var(--red));
}

.page-faq .faq-cta__inner {
  display: grid;
  gap: 24px;
}

.page-faq .faq-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--porcelain);
}

.page-faq .faq-cta p {
  max-width: 58ch;
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-hero {
    padding: 56px 0 116px;
  }

  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 48px;
  }

  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 48px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

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

  .page-faq .faq-group {
    margin-bottom: 64px;
  }
}

@media (max-width: 560px) {
  .page-faq .faq-item__q {
    gap: 10px;
    padding: 16px 2px;
  }

  .page-faq .faq-item__a {
    padding: 0 2px 22px 2px;
    border-left-width: 0;
  }

  .page-faq .faq-item[open] .faq-item__a {
    padding-left: 14px;
    border-left-width: 2px;
  }

  .page-faq .faq-item__text {
    font-size: 15px;
  }
}