.page-faq {
  --faq-surface: rgba(18, 39, 69, 0.62);
  --faq-surface-deep: rgba(12, 24, 48, 0.9);
  --faq-cyan-veil: rgba(53, 242, 224, 0.1);
  background: var(--abyss-900);
  color: var(--ink-050);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 5vw, 52px) 0 clamp(26px, 4vw, 46px);
  background:
    radial-gradient(120% 92% at 88% -10%, var(--faq-cyan-veil), transparent 62%),
    radial-gradient(80% 70% at 0% 110%, rgba(255, 106, 43, 0.11), transparent 70%),
    var(--abyss-950);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(53, 242, 224, 0.055) 0 1px, transparent 1px 92px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 82%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 82%);
  pointer-events: none;
}

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

.page-faq .faq-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: clamp(20px, 3vw, 30px) 0 14px;
  padding: 6px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan-200);
}

.page-faq .faq-hero__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal-500);
  box-shadow: 0 0 0 4px rgba(255, 106, 43, 0.18);
}

.page-faq .faq-hero h1 {
  margin: 0;
  max-width: 20em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4.6vw, 58px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ink-050);
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 38em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--mist-300);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-soft);
  background: rgba(7, 13, 28, 0.7);
}

.page-faq .faq-hero__num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--cyan-400);
}

.page-faq .faq-hero__num em {
  font-style: normal;
  font-size: 12px;
  margin-left: 1px;
  color: var(--cyan-200);
}

.page-faq .faq-hero__cap {
  font-size: 13px;
  color: var(--mist-300);
}

/* ---------- 主栅格 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding: clamp(8px, 2vw, 26px) 0 clamp(48px, 7vw, 96px);
}

/* ---------- 分组目录（移动端为顶部横条） ---------- */
.page-faq .faq-index {
  position: sticky;
  top: 0;
  z-index: 6;
  margin: 0 calc(var(--gutter) * -1) clamp(18px, 3vw, 26px);
  padding: 10px var(--gutter);
  background: rgba(4, 7, 15, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-index__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist-dim);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 2px 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-index__list li {
  flex: 0 0 auto;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-soft);
  background: var(--ocean-800);
  color: var(--mist-300);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .faq-index__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan-400);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-color: var(--line-strong);
  background: var(--ocean-700);
  color: var(--ink-050);
}

.page-faq .faq-index__link:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 104px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(28px, 4.6vw, 52px);
  padding-top: clamp(24px, 4vw, 44px);
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 56px);
  font-weight: 200;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--cyan-400);
  opacity: 0.36;
  transition: opacity 0.3s var(--ease), color 0.3s var(--ease);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 27px);
  letter-spacing: -0.01em;
  color: var(--ink-050);
}

.page-faq .faq-group__note {
  flex: 1 1 100%;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-300);
}

.page-faq .faq-group:target .faq-group__no {
  opacity: 1;
}

.page-faq .faq-group:target .faq-group__title {
  color: var(--cyan-200);
}

/* ---------- 手风琴条目 ---------- */
.page-faq .qa {
  margin-bottom: 10px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: linear-gradient(158deg, var(--faq-surface), var(--faq-surface-deep));
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-faq .qa:hover {
  border-color: var(--line-strong);
}

.page-faq .qa[open] {
  border-color: var(--line-strong);
  box-shadow: 0 0 24px rgba(53, 242, 224, 0.09);
}

.page-faq .qa__q {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--ink-050);
}

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

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: -2px;
  border-radius: var(--r-md);
}

.page-faq .qa__no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist-dim);
  transition: color 0.2s var(--ease);
}

.page-faq .qa[open] .qa__no {
  color: var(--cyan-400);
}

.page-faq .qa__text {
  flex: 1 1 auto;
}

.page-faq .qa__arrow {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-right: 3px;
  border-right: 1.5px solid var(--cyan-400);
  border-bottom: 1.5px solid var(--cyan-400);
  transform: rotate(-45deg);
  transition: transform 0.18s var(--ease);
}

.page-faq .qa[open] .qa__arrow {
  transform: rotate(45deg);
}

.page-faq .qa__a {
  margin: 0 16px 16px;
  padding: 2px 0 2px 14px;
  border-left: 2px solid rgba(53, 242, 224, 0.55);
}

.page-faq .qa__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-300);
}

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

.page-faq .qa__link {
  color: var(--cyan-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(141, 249, 239, 0.4);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .qa__link:hover,
.page-faq .qa__link:focus-visible {
  color: var(--cyan-400);
  border-color: var(--cyan-400);
}

.page-faq .qa__link:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
  border-radius: 3px;
}

/* ---------- 图 ---------- */
.page-faq .faq-figure {
  margin: 14px 0 0;
}

.page-faq .faq-figure img,
.page-faq .faq-aside__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  object-fit: cover;
}

/* ---------- 人工协助分组 ---------- */
.page-faq .faq-group--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-faq .faq-group--split .faq-group__head,
.page-faq .faq-group--split .faq-group__main {
  grid-column: 1 / -1;
}

.page-faq .faq-group--split .faq-group__main {
  min-width: 0;
}

.page-faq .faq-help__tail {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-faq .faq-aside {
  grid-column: 1 / -1;
  padding: 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  background: linear-gradient(200deg, rgba(12, 24, 48, 0.92), rgba(4, 7, 15, 0.92));
}

.page-faq .faq-aside__figure {
  margin: 0 0 14px;
}

.page-faq .faq-aside__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--cyan-200);
}

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

.page-faq .faq-aside__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist-300);
}

.page-faq .faq-aside__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--cyan-400);
  opacity: 0.75;
}

/* ---------- 收尾入口 ---------- */
.page-faq .faq-cta {
  margin-top: clamp(30px, 5vw, 58px);
  padding: clamp(22px, 3.6vw, 38px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  background:
    radial-gradient(90% 130% at 100% 0%, rgba(255, 106, 43, 0.14), transparent 62%),
    var(--ocean-800);
}

.page-faq .faq-cta__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--signal-500);
}

.page-faq .faq-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 2.8vw, 30px);
  letter-spacing: -0.01em;
  color: var(--ink-050);
}

.page-faq .faq-cta__text {
  margin: 0 0 20px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-300);
}

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

.page-faq .faq-cta__actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-strong);
  color: var(--ink-050);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-cta__actions a:first-child {
  background: var(--signal-500);
  border-color: var(--signal-500);
  color: #04070F;
}

.page-faq .faq-cta__actions a:last-child {
  background: transparent;
}

.page-faq .faq-cta__actions a:hover {
  transform: translateY(-2px);
}

.page-faq .faq-cta__actions a:last-child:hover {
  background: var(--ocean-700);
  border-color: var(--cyan-200);
}

.page-faq .faq-cta__actions a:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

/* ---------- 中屏 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-group--split {
    grid-template-columns: minmax(0, 1fr) 268px;
    gap: 20px 24px;
    align-items: start;
  }

  .page-faq .faq-aside {
    grid-column: 2;
  }
}

/* ---------- 桌面：左栏固定目录 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
    align-items: start;
    padding-top: clamp(26px, 3.4vw, 46px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: 108px;
    align-self: start;
    margin: 0;
    padding: 0;
    background: none;
    backdrop-filter: none;
    border-bottom: 0;
    border-left: 1px solid var(--line-soft);
    padding-left: 16px;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding: 0;
  }

  .page-faq .faq-index__link {
    width: 100%;
    justify-content: flex-start;
    padding: 9px 10px;
    border-color: transparent;
    background: transparent;
    font-size: 14px;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    background: var(--ocean-800);
    border-color: var(--line-soft);
  }

  .page-faq .faq-group {
    scroll-margin-top: 130px;
  }

  .page-faq .qa__q {
    padding: 17px 20px;
  }

  .page-faq .qa__a {
    margin: 0 20px 18px;
    padding-left: 16px;
  }

  .page-faq .faq-aside {
    position: sticky;
    top: 108px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-layout {
    grid-template-columns: 232px minmax(0, 1fr);
  }

  .page-faq .faq-group--split {
    grid-template-columns: minmax(0, 1fr) 300px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__arrow,
  .page-faq .qa,
  .page-faq .faq-index__link,
  .page-faq .faq-cta__actions a,
  .page-faq .faq-group__no {
    transition: none;
  }

  .page-faq .faq-cta__actions a:hover {
    transform: none;
  }
}