.page-faq {
  --faq-sticky-top: 84px;
  --faq-tint: rgba(47, 230, 198, 0.08);
  padding-bottom: 104px;
}

.page-faq .page-shell {
  padding-top: clamp(16px, 3vw, 30px);
}

.page-faq .breadcrumb {
  margin-bottom: clamp(28px, 5vw, 52px);
  font-size: 13px;
  letter-spacing: 0.04em;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  display: grid;
  gap: 34px;
  padding-bottom: clamp(40px, 6vw, 64px);
  border-bottom: 1px solid var(--edge);
}

.page-faq .faq-hero h1 {
  margin: 18px 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7.6vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-faq .hero-copy .lede {
  max-width: 50ch;
}

.page-faq .hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 16px;
}

.page-faq .hero-copy .stamp {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .hero-media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}

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

/* ---------- 分类导航 ---------- */

.page-faq .faq-nav {
  position: sticky;
  top: var(--faq-sticky-top);
  z-index: 6;
  margin: 22px 0 0;
  padding: 12px 0;
  background: linear-gradient(180deg, rgba(10, 19, 17, 0.97) 0%, rgba(10, 19, 17, 0.78) 72%, rgba(10, 19, 17, 0) 100%);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.page-faq .faq-nav .chip-row {
  display: flex;
  flex-wrap: nowrap;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-nav .chip-row::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-nav .chip {
  flex: 0 0 auto;
  padding: 9px 18px;
  border: 1px solid var(--edge);
  border-radius: 999px;
  background: var(--deep-green);
  color: var(--white);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-faq .faq-nav .chip:hover,
.page-faq .faq-nav .chip:focus-visible {
  border-color: var(--signal);
  color: var(--signal);
  background: rgba(47, 230, 198, 0.1);
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  padding-top: clamp(56px, 8vw, 88px);
  scroll-margin-top: 150px;
}

.page-faq .group-head {
  display: grid;
  gap: 12px;
  max-width: 64ch;
}

.page-faq .group-head .section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.6vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--white);
  margin: 0;
}

.page-faq .group-head .prose {
  max-width: 58ch;
}

/* ---------- 问答条目 ---------- */

.page-faq .qa-list {
  margin-top: clamp(26px, 4vw, 40px);
  border-top: 1px solid var(--edge);
}

.page-faq .qa-item {
  position: relative;
  border-bottom: 1px solid var(--edge);
}

.page-faq .qa-item summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 14px;
  padding: 22px 6px 22px 20px;
  cursor: pointer;
  list-style: none;
  transition: background 0.22s var(--ease);
}

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

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

.page-faq .qa-item summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 2px;
  background: var(--signal);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.22s var(--ease);
}

.page-faq .qa-item[open] summary::before {
  transform: scaleY(1);
}

.page-faq .qa-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 0.8;
  color: var(--signal);
  transition: color 0.22s var(--ease);
}

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

.page-faq .qa-item summary:hover,
.page-faq .qa-item summary:focus-visible {
  background: var(--faq-tint);
}

.page-faq .qa-item[open] summary {
  background: var(--faq-tint);
}

.page-faq .qa-num {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--score);
  padding-top: 4px;
}

.page-faq .qa-q {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.3vw, 21px);
  line-height: 1.42;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .qa-a {
  padding: 0 6px 26px 20px;
  max-width: 70ch;
  animation: faq-answer-in 0.24s var(--ease) both;
}

.page-faq .qa-a p {
  margin: 0 0 10px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--mist);
}

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

@keyframes faq-answer-in {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 组内延伸入口 ---------- */

.page-faq .group-link {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 0;
}

/* ---------- 配图 ---------- */

.page-faq .score-media {
  margin: clamp(32px, 5vw, 52px) 0 0;
  max-width: 720px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-faq .score-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 20 / 13;
  object-fit: cover;
}

.page-faq .score-media figcaption {
  padding: 14px 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  background: var(--deep-green);
}

/* ---------- 仍未解决 ---------- */

.page-faq .faq-help .help-panel {
  padding: clamp(28px, 5vw, 56px);
  border-radius: var(--radius-lg);
  background: linear-gradient(140deg, var(--deep-green) 0%, var(--charcoal) 68%);
  border-left: 2px solid var(--signal);
}

.page-faq .help-panel .section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.6vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--white);
  margin: 14px 0 16px;
}

.page-faq .help-panel .prose {
  max-width: 62ch;
}

.page-faq .contact-mail {
  color: var(--signal);
  font-size: 15px;
  word-break: break-all;
}

.page-faq .help-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
  border-top: 1px solid var(--edge);
  padding-top: 24px;
}

.page-faq .help-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 68ch;
}

.page-faq .help-index {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--score);
}

.page-faq .help-panel .prose a {
  color: var(--signal);
  text-decoration: underline;
  text-decoration-color: var(--signal-deep);
  text-underline-offset: 3px;
}

/* ---------- 回顶 ---------- */

.page-faq .faq-back {
  margin: clamp(56px, 8vw, 88px) 0 0;
  text-align: right;
  border-top: 1px solid var(--edge);
  padding-top: 24px;
}

.page-faq .faq-back a {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.22s var(--ease);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    gap: clamp(32px, 5vw, 72px);
  }

  .page-faq .hero-media img {
    aspect-ratio: 3 / 4;
    min-height: 360px;
  }

  .page-faq .qa-item summary {
    gap: 20px;
    padding: 26px 8px 26px 26px;
  }

  .page-faq .qa-a {
    padding: 0 8px 30px 60px;
  }

  .page-faq .faq-group:nth-of-type(even) .group-head {
    margin-left: auto;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-hero h1 {
    max-width: 18ch;
  }
}

@media (max-width: 520px) {
  .page-faq .qa-num {
    display: none;
  }

  .page-faq .qa-item summary {
    grid-template-columns: minmax(0, 1fr) auto;
    padding-left: 16px;
  }

  .page-faq .qa-a {
    padding-left: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-item summary,
  .page-faq .qa-item summary::before,
  .page-faq .qa-item summary::after,
  .page-faq .faq-nav .chip,
  .page-faq .faq-back a {
    transition: none;
  }

  .page-faq .qa-a {
    animation: none;
  }
}