.page-faq {
  --faq-line: var(--grid);
  --faq-panel: var(--panel);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 132px 0 58px;
  border-bottom: 1px solid var(--faq-line);
  background:
    radial-gradient(760px 340px at 8% -12%, rgba(162, 75, 255, 0.22), transparent 68%),
    radial-gradient(620px 320px at 94% 4%, rgba(255, 106, 26, 0.16), transparent 70%);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--faq-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--faq-line) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.4;
  -webkit-mask-image: radial-gradient(78% 68% at 32% 42%, #000 0%, transparent 76%);
  mask-image: radial-gradient(78% 68% at 32% 42%, #000 0%, transparent 76%);
  pointer-events: none;
}

.page-faq .faq-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 44px;
  align-items: end;
}

.page-faq .faq-hero-copy {
  max-width: 640px;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(38px, 6.4vw, 62px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.02;
  color: var(--text);
}

.page-faq .faq-hero h1::after {
  content: "";
  display: block;
  width: 76px;
  height: 4px;
  margin-top: 18px;
  background: linear-gradient(90deg, var(--orange), var(--purple));
}

.page-faq .faq-lede {
  margin: 22px 0 22px;
  max-width: 42ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--dim);
}

.page-faq .faq-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-hero-media {
  margin: 0;
  transform: translateY(-10px);
}

.page-faq .faq-hero-media .media-frame {
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-hard);
}

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

/* ---------- 主体双栏 ---------- */
.page-faq .faq-body {
  padding: 64px 0 104px;
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}

/* ---------- 左侧分组目录 ---------- */
.page-faq .faq-index {
  position: sticky;
  top: 104px;
  padding: 18px 16px;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-md);
  background: rgba(15, 23, 40, 0.88);
  backdrop-filter: blur(6px);
}

.page-faq .faq-index-title {
  margin: 0 0 14px;
  padding-left: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--dim);
}

.page-faq .faq-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-faq .index-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 10px 10px 14px;
  border-left: 2px solid var(--faq-line);
  border-radius: 0;
  color: var(--dim);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}

.page-faq .index-link:hover {
  color: var(--text);
  border-left-color: var(--purple);
  background: rgba(162, 75, 255, 0.08);
}

.page-faq .index-link:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -2px;
}

.page-faq .index-link[aria-current] {
  color: var(--orange);
  border-left-color: var(--orange);
  background: rgba(255, 106, 26, 0.09);
}

.page-faq .faq-index-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  opacity: 0.85;
}

/* ---------- 分组与问答 ---------- */
.page-faq .faq-groups {
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: 112px;
}

.page-faq .faq-group + .faq-group {
  margin-top: 56px;
  padding-top: 56px;
  border-top: 1px dashed var(--faq-line);
}

.page-faq .faq-group-head {
  display: grid;
  gap: 8px;
  margin-bottom: 22px;
}

.page-faq .faq-group-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-faq .faq-group-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 30px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text);
}

.page-faq .faq-group-desc {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--dim);
}

.page-faq .faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-faq .faq-item {
  border: 1px solid var(--faq-line);
  border-left: 3px solid var(--faq-line);
  border-radius: var(--radius-sm);
  background: var(--faq-panel);
  transition: border-color 0.16s ease, transform 0.16s ease;
}

.page-faq .faq-item:hover {
  border-color: rgba(255, 106, 26, 0.45);
  border-left-color: var(--orange);
  transform: translateY(-2px);
}

.page-faq .faq-item[open] {
  border-color: rgba(255, 106, 26, 0.3);
  border-left-color: var(--orange);
}

.page-faq .faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 15px 18px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--text);
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-q::after {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: -4px;
  border-right: 2px solid var(--orange);
  border-bottom: 2px solid var(--orange);
  transform: rotate(45deg);
  transition: transform 0.18s ease, margin-top 0.18s ease;
}

.page-faq .faq-item[open] .faq-q::after {
  transform: rotate(-135deg);
  margin-top: 4px;
}

.page-faq .faq-q:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -3px;
  border-radius: var(--radius-sm);
}

.page-faq .faq-a {
  padding: 0 18px 18px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--dim);
}

.page-faq .faq-a p {
  margin: 0;
  max-width: 46ch;
}

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

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

.page-faq .faq-a a:hover {
  color: var(--orange);
}

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

.page-faq .faq-figure .media-frame {
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-faq .faq-figure .media-caption {
  margin-top: 10px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 36px;
  }
}

@media (max-width: 900px) {
  .page-faq .faq-hero {
    padding: 108px 0 48px;
  }

  .page-faq .faq-hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    align-items: start;
  }

  .page-faq .faq-hero-media {
    transform: none;
  }

  .page-faq .faq-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .page-faq .faq-index {
    position: static;
    top: auto;
    padding: 14px;
  }

  .page-faq .faq-index-title {
    padding-left: 0;
    margin-bottom: 10px;
  }

  .page-faq .faq-index-list {
    flex-direction: row;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: none;
  }

  .page-faq .faq-index-list::-webkit-scrollbar {
    display: none;
  }

  .page-faq .index-link {
    white-space: nowrap;
    border: 1px solid var(--faq-line);
    border-left: 1px solid var(--faq-line);
    border-radius: var(--radius-pill);
    padding: 8px 13px;
    background: rgba(15, 23, 40, 0.7);
  }

  .page-faq .index-link[aria-current] {
    border-color: var(--orange);
  }
}

@media (max-width: 640px) {
  .page-faq .faq-hero {
    padding: 96px 0 44px;
  }

  .page-faq .faq-lede {
    font-size: 16px;
  }

  .page-faq .faq-body {
    padding: 44px 0 76px;
  }

  .page-faq .faq-group + .faq-group {
    margin-top: 40px;
    padding-top: 40px;
  }

  .page-faq .faq-q {
    padding: 14px 15px;
    font-size: 15px;
    gap: 12px;
  }

  .page-faq .faq-a {
    padding: 0 15px 16px;
  }

  .page-faq .faq-a p {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-q::after,
  .page-faq .index-link {
    transition: none;
  }

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