.page-faq {
  --faq-rail: 250px;
  background: var(--ph-void);
  color: var(--ph-ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 52px 0 44px;
  overflow: hidden;
  border-bottom: 1px solid var(--ph-line-soft);
  background:
    radial-gradient(circle at 88% 4%, rgba(92, 225, 255, 0.16), transparent 54%),
    linear-gradient(118deg, rgba(109, 60, 255, 0.32) 0%, rgba(42, 26, 85, 0.18) 44%, rgba(7, 6, 13, 0) 68%),
    var(--ph-void);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(115deg, rgba(156, 147, 191, 0.10) 0 1px, transparent 1px 22px);
  opacity: 0.55;
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__title {
  margin: 16px 0 0;
  max-width: 16em;
  font-family: var(--ph-font-display);
  font-weight: 800;
  font-size: clamp(32px, 5vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--ph-ink);
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 620px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ph-muted);
}

.page-faq .faq-hero__facts {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  font-family: var(--ph-font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ph-muted);
}

.page-faq .faq-hero__facts li {
  display: flex;
  align-items: center;
  gap: 9px;
}

.page-faq .faq-hero__facts li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ph-neon);
  box-shadow: 0 0 10px rgba(53, 242, 165, 0.9);
}

/* ---------- 主体栅格 ---------- */
.page-faq .faq-main__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

/* ---------- 左侧主题导航 ---------- */
.page-faq .faq-rail__title {
  margin: 0 0 10px;
  font-family: var(--ph-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ph-muted);
}

.page-faq .faq-rail__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-faq .faq-rail__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--ph-line);
  border-radius: var(--ph-pill);
  background: rgba(28, 26, 43, 0.6);
  color: var(--ph-muted);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ph-ease), border-color 0.2s var(--ph-ease), background 0.2s var(--ph-ease);
}

.page-faq .faq-rail__link .ph-num {
  color: var(--ph-ice);
  font-size: 12px;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--ph-ink);
  border-color: var(--ph-ice);
  background: rgba(92, 225, 255, 0.10);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  margin-bottom: 46px;
}

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

.page-faq .faq-group .ph-sect-head {
  margin-bottom: 18px;
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  position: relative;
  margin-bottom: 12px;
  border: 1px solid var(--ph-line-soft);
  border-radius: var(--ph-radius);
  background: linear-gradient(180deg, rgba(42, 26, 85, 0.52), rgba(12, 10, 22, 0.92));
  overflow: hidden;
  transition: border-color 0.25s var(--ph-ease), transform 0.25s var(--ph-ease), box-shadow 0.25s var(--ph-ease);
}

.page-faq .faq-item:hover {
  transform: translateY(-3px);
  border-color: var(--ph-line);
  box-shadow: var(--ph-shadow);
}

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

.page-faq .faq-item > summary {
  position: relative;
  display: block;
  padding: 16px 46px 16px 20px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ph-ink);
  transition: color 0.2s var(--ph-ease);
}

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

.page-faq .faq-item > summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--ph-neon);
  opacity: 0;
  transition: opacity 0.22s var(--ph-ease);
}

.page-faq .faq-item[open] > summary::before {
  opacity: 1;
}

.page-faq .faq-item > summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 15px;
  font-family: var(--ph-font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--ph-ice);
}

.page-faq .faq-item[open] > summary::after {
  content: "\2013";
  color: var(--ph-neon);
}

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

.page-faq .faq-item__body {
  padding: 2px 20px 18px 20px;
  border-top: 1px solid var(--ph-line-soft);
}

.page-faq .faq-item__body p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ph-muted);
}

.page-faq .faq-item__body a {
  color: var(--ph-ice);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-item__body a:hover {
  color: var(--ph-neon);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 26px 0 0;
}

.page-faq .faq-figure--square {
  max-width: 520px;
}

.page-faq .faq-figure .ph-media {
  border: 1px solid var(--ph-line);
  border-radius: var(--ph-radius-lg);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 路径示意 ---------- */
.page-faq .faq-path {
  margin: 28px 0 0;
  padding: 24px 20px 16px;
  border: 1px solid var(--ph-line);
  border-radius: var(--ph-radius-lg);
  background:
    radial-gradient(circle at 16% 28%, rgba(109, 60, 255, 0.28), transparent 62%),
    var(--ph-panel-2);
}

.page-faq .faq-path .ph-eyebrow {
  margin: 0 0 6px;
}

.page-faq .faq-path__svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 900px;
}

/* ---------- 结尾引导 ---------- */
.page-faq .faq-cta__box {
  display: grid;
  gap: 24px;
  padding: 30px 24px;
  border: 1px solid var(--ph-line);
  border-radius: var(--ph-radius-lg);
  background: linear-gradient(120deg, rgba(109, 60, 255, 0.30), rgba(12, 10, 22, 0.92) 64%);
  box-shadow: var(--ph-shadow);
}

.page-faq .faq-cta__title {
  margin: 10px 0 0;
  font-family: var(--ph-font-display);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.2;
  color: var(--ph-ink);
}

.page-faq .faq-cta__desc {
  margin: 12px 0 0;
  max-width: 640px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ph-muted);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-main__grid {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--ph-header-h) + 20px);
  }

  .page-faq .faq-rail__nav {
    display: block;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--ph-line-soft);
  }

  .page-faq .faq-rail__link {
    display: flex;
    width: 100%;
    padding: 11px 14px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    white-space: normal;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    border-left-color: var(--ph-neon);
    background: rgba(109, 60, 255, 0.12);
    color: var(--ph-ink);
  }

  .page-faq .faq-hero {
    padding: 72px 0 60px;
  }

  .page-faq .faq-cta__box {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 40px 44px;
  }

  .page-faq .faq-group {
    margin-bottom: 56px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-hero {
    padding: 88px 0 68px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-rail__link,
  .page-faq .faq-item > summary::before {
    transition: none;
  }

  .page-faq .faq-item:hover {
    transform: none;
  }
}