.page-faq {
  padding-block: clamp(24px, 5vw, 64px) clamp(48px, 8vw, 96px);
  background:
    linear-gradient(180deg, rgba(6, 59, 59, 0.55) 0%, rgba(7, 10, 11, 0) 320px),
    var(--ink);
  color: var(--bone);
}

.page-faq .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-faq .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--steel);
}

.page-faq .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(142, 165, 163, 0.5);
}

.page-faq .breadcrumb-list a {
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-faq .breadcrumb-list [aria-current="page"] {
  color: var(--bone);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding-bottom: clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--border);
}

.page-faq .faq-hero .eyebrow {
  margin-bottom: 16px;
}

.page-faq .faq-hero h1 {
  margin: 0;
  max-width: 18em;
  font-family: var(--font-display);
  font-size: clamp(30px, 6vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-faq .faq-hero .lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.75;
  color: rgba(243, 248, 245, 0.82);
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--grid);
  border: 1px solid var(--border);
}

.page-faq .faq-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--panel);
}

.page-faq .faq-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-stat-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-faq .faq-hero-figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
  border: 1px solid var(--border);
  background: var(--panel);
}

.page-faq .faq-hero-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq .faq-hero-figure figcaption,
.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 主体两栏 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(28px, 4vw, 48px);
}

.page-faq .faq-rail {
  align-self: start;
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 2px solid var(--cyan);
}

.page-faq .faq-rail-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--steel);
  text-transform: uppercase;
}

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

.page-faq .faq-rail-link {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 10px 10px 10px 8px;
  color: var(--bone);
  font-size: 14px;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-rail-link:hover,
.page-faq .faq-rail-link:focus-visible {
  background: var(--panel-2);
  border-left-color: var(--purple);
  transform: translateX(2px);
}

.page-faq .faq-rail-idx {
  font-size: 11px;
  color: var(--steel);
}

.page-faq .faq-rail-link:hover .faq-rail-idx,
.page-faq .faq-rail-link:focus-visible .faq-rail-idx {
  color: var(--orange);
}

.page-faq .faq-rail-count {
  font-size: 11px;
  color: var(--steel);
  border: 1px solid var(--border);
  padding: 1px 6px;
}

.page-faq .faq-rail-note {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.page-faq .faq-rail-note p {
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--steel);
}

.page-faq .faq-rail-note .btn {
  width: 100%;
  justify-content: center;
}

/* ---------- 问答分组 ---------- */

.page-faq .faq-flow {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: 80px;
  border-top: 1px solid var(--border);
  padding-top: clamp(20px, 3vw, 28px);
}

.page-faq .faq-group-head {
  display: grid;
  gap: 10px;
  margin-bottom: 18px;
}

.page-faq .faq-group-head .tag {
  justify-self: start;
}

.page-faq .faq-group h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 800;
}

.page-faq .faq-group-intro {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(243, 248, 245, 0.7);
}

.page-faq .faq-figure {
  margin: 0 0 18px;
  border: 1px solid var(--border);
  background: var(--panel);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ---------- 折叠项 ---------- */

.page-faq .faq-item {
  border: 1px solid var(--border);
  border-bottom: none;
  background: var(--panel);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

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

.page-faq .faq-item[open] {
  background: var(--panel-2);
  border-color: rgba(46, 242, 200, 0.34);
}

.page-faq .faq-item summary {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 44px 16px 16px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--bone);
  list-style: none;
}

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

.page-faq .faq-item summary::after {
  content: "+";
  position: absolute;
  top: 14px;
  right: 14px;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--cyan);
  border: 1px solid var(--grid);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq .faq-item[open] summary::after {
  content: "−";
  background: var(--cyan);
  color: var(--ink);
  border-color: var(--cyan);
  transform: rotate(180deg);
}

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

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

.page-faq .faq-answer {
  padding: 0 16px 18px;
  border-left: 2px solid rgba(46, 242, 200, 0.35);
  margin-left: 16px;
  padding-left: 14px;
}

.page-faq .faq-answer p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(243, 248, 245, 0.8);
}

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

.page-faq .faq-list {
  margin: 0 0 10px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-faq .faq-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(243, 248, 245, 0.8);
}

.page-faq .faq-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 1px;
  background: var(--orange);
}

.page-faq .faq-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 242, 200, 0.4);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

/* ---------- 下一步 ---------- */

.page-faq .faq-next {
  display: grid;
  gap: 20px;
  padding: clamp(20px, 4vw, 32px);
  background: linear-gradient(135deg, var(--teal) 0%, var(--indigo) 100%);
  border: 1px solid rgba(243, 248, 245, 0.16);
}

.page-faq .faq-next h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 26px);
  line-height: 1.3;
  font-weight: 800;
}

.page-faq .faq-next-copy p:last-child {
  margin: 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(243, 248, 245, 0.78);
}

.page-faq .faq-next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .faq-next-actions .btn {
  flex: 1 1 auto;
  justify-content: center;
  min-width: 132px;
}

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

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-item summary {
    padding: 18px 52px 18px 20px;
    font-size: 16px;
  }

  .page-faq .faq-answer {
    padding: 0 20px 20px;
    margin-left: 20px;
    padding-left: 18px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--head-h) + 24px);
  }

  .page-faq .faq-next {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item summary::after,
  .page-faq .faq-rail-link,
  .page-faq .breadcrumb-list a,
  .page-faq .faq-link {
    transition: none;
  }

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