.page-faq {
  --faq-rail-w: 300px;
  --faq-line: rgba(232, 237, 247, .14);
  --faq-line-soft: rgba(232, 237, 247, .09);
  --faq-violet-tint: rgba(122, 77, 255, .18);
  --faq-cyan-tint: rgba(41, 230, 208, .10);
  --faq-orange-tint: rgba(255, 106, 43, .12);
  --faq-sticky: 108px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 28px 0 40px;
  overflow: hidden;
}
.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -120px -10% auto -20%;
  height: 420px;
  background:
    radial-gradient(60% 80% at 20% 30%, var(--tint-violet), transparent 65%),
    radial-gradient(50% 70% at 78% 12%, var(--faq-cyan-tint), transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}
.page-faq .faq-hero__title {
  margin: 14px 0 0;
  max-width: 20ch;
  color: var(--c-white);
}
.page-faq .faq-hero__lede {
  margin-top: 18px;
  max-width: 60ch;
  color: var(--c-body);
}
.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ---------- 布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding-bottom: 72px;
}

/* ---------- 左侧导航 ---------- */
.page-faq .faq-rail {
  display: grid;
  gap: 24px;
}
.page-faq .faq-rail__figure {
  margin: 0;
}
.page-faq .faq-rail__media {
  aspect-ratio: 12 / 7;
  border-radius: var(--r-md);
  border: 1px solid var(--faq-line);
  background:
    linear-gradient(150deg, rgba(14, 23, 64, .9), rgba(7, 15, 43, .95)),
    var(--c-midnight);
}
.page-faq .faq-rail__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
}

.page-faq .faq-scene {
  border: 1px solid var(--faq-line);
  border-radius: var(--r-md);
  padding: 18px 16px;
  background: linear-gradient(180deg, rgba(14, 23, 64, .7), rgba(7, 15, 43, .55));
}
.page-faq .faq-scene__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-cyan);
}
.page-faq .faq-scene__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}
.page-faq .faq-scene__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 10px;
  border-radius: var(--r-sm);
  color: var(--c-mist);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.page-faq .faq-scene__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-mute);
}
.page-faq .faq-scene__link:hover,
.page-faq .faq-scene__link:focus-visible {
  background: var(--tint-cyan);
  color: var(--c-white);
}
.page-faq .faq-scene__link:hover .faq-scene__num,
.page-faq .faq-scene__link:focus-visible .faq-scene__num {
  color: var(--c-orange);
}

.page-faq .faq-rail__card {
  border: 1px solid var(--faq-line);
  border-radius: var(--r-md);
  padding: 18px 16px;
  background: linear-gradient(160deg, rgba(122, 77, 255, .16), rgba(7, 15, 43, .5));
}
.page-faq .faq-rail__card-title {
  margin: 0 0 8px;
  font-weight: 800;
  color: var(--c-white);
  font-size: 16px;
}
.page-faq .faq-rail__card-text {
  margin: 0 0 14px;
  color: var(--c-body);
  font-size: 14px;
  line-height: 1.75;
}
.page-faq .faq-rail__btn {
  width: 100%;
  justify-content: center;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-stream {
  display: grid;
  gap: 36px;
  min-width: 0;
}

.page-faq .faq-group {
  padding: 28px 22px 24px;
  border-radius: var(--r-lg);
  border: 1px solid var(--faq-line-soft);
  background: linear-gradient(180deg, rgba(14, 23, 64, .55), rgba(7, 15, 43, .35));
  min-width: 0;
}
.page-faq .faq-group--violet {
  background: linear-gradient(180deg, rgba(122, 77, 255, .14), rgba(7, 15, 43, .4));
  border-color: rgba(122, 77, 255, .22);
}
.page-faq .faq-group--teal {
  background: linear-gradient(180deg, rgba(11, 59, 60, .6), rgba(7, 15, 43, .4));
  border-color: rgba(41, 230, 208, .16);
}
.page-faq .faq-group--wine {
  background: linear-gradient(180deg, rgba(110, 18, 48, .34), rgba(7, 15, 43, .4));
  border-color: rgba(255, 106, 43, .18);
}
.page-faq .faq-group--help {
  background: linear-gradient(160deg, rgba(41, 230, 208, .10), rgba(7, 15, 43, .5));
  border-color: var(--line-cyan);
}

.page-faq .faq-group__head {
  margin-bottom: 22px;
}
.page-faq .faq-group__kicker {
  display: inline-block;
  margin: 0 0 10px;
  padding: 4px 10px;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-cyan);
  background: var(--faq-cyan-tint);
}
.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(24px, 4.6vw, 34px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.2;
  color: var(--c-white);
}
.page-faq .faq-group__intro {
  margin: 12px 0 0;
  max-width: 46ch;
  color: var(--c-mute);
  font-size: 15px;
  line-height: 1.75;
}

.page-faq .faq-group__figure {
  margin: 0 0 22px;
}
.page-faq .faq-group__media {
  aspect-ratio: 5 / 4;
  border-radius: var(--r-md);
  border: 1px solid var(--faq-line);
  overflow: hidden;
  background: linear-gradient(150deg, rgba(14, 23, 64, .9), rgba(7, 15, 43, .95));
}
.page-faq .faq-group__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-faq .faq-group__figure .figure__caption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--c-mute);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  border-top: 1px solid var(--faq-line);
  padding: 4px 0;
}
.page-faq .qa:first-of-type {
  border-top-color: var(--faq-line-soft);
}
.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 16px 4px 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--c-mist);
  transition: color var(--dur) var(--ease);
  position: relative;
}
.page-faq .qa__q::-webkit-details-marker {
  display: none;
}
.page-faq .qa__q::after {
  content: "";
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  margin-left: auto;
  margin-top: 6px;
  border-right: 2px solid var(--c-cyan);
  border-bottom: 2px solid var(--c-cyan);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease);
}
.page-faq .qa[open] .qa__q {
  color: var(--c-white);
}
.page-faq .qa[open] .qa__q::after {
  transform: rotate(-135deg);
}
.page-faq .qa__q:hover,
.page-faq .qa__q:focus-visible {
  color: var(--c-cyan);
}
.page-faq .qa__label {
  flex: 0 0 auto;
  align-self: flex-start;
  margin-top: 2px;
  padding: 2px 8px;
  border-radius: var(--r-xs);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--c-cyan);
  background: var(--faq-cyan-tint);
  border: 1px solid var(--faq-line-soft);
}
.page-faq .qa__a {
  padding: 0 4px 18px 0;
}
.page-faq .qa__a p {
  margin: 0;
  max-width: 40em;
  color: var(--c-body);
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 客服结束区 ---------- */
.page-faq .faq-help {
  display: grid;
  gap: 18px;
}
.page-faq .faq-help__text {
  margin: 0;
  max-width: 52ch;
  color: var(--c-body);
  font-size: 15px;
  line-height: 1.85;
}
.page-faq .faq-help__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-faq .faq-help__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 12px 14px;
  border-radius: var(--r-sm);
  border: 1px solid var(--faq-line-soft);
  background: rgba(7, 15, 43, .5);
}
.page-faq .faq-help__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-mute);
}
.page-faq .faq-help__value {
  font-weight: 700;
  color: var(--c-white);
  text-decoration: none;
  font-size: 15px;
  word-break: break-all;
}
.page-faq a.faq-help__value:hover,
.page-faq a.faq-help__value:focus-visible {
  color: var(--c-orange);
}
.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-logline {
  margin: 0;
  padding: 18px 20px;
  border-left: 2px solid var(--c-cyan);
  color: var(--c-mute);
  font-size: 14px;
  line-height: 1.8;
  background: linear-gradient(90deg, var(--faq-cyan-tint), transparent 70%);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}

/* 焦点环 */
.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

/* ---------- 滚动显现 ---------- */
.page-faq [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .38s var(--ease), transform .38s var(--ease);
}
.page-faq [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-layout {
    gap: 48px;
  }
  .page-faq .faq-group {
    padding: 34px 30px 30px;
  }
  .page-faq .faq-group__figure {
    margin-bottom: 26px;
  }
  .page-faq .faq-help__actions .btn {
    min-width: 158px;
    justify-content: center;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-faq .faq-hero {
    padding: 40px 0 56px;
  }
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-sticky);
  }
  .page-faq .faq-stream {
    gap: 44px;
  }
}

/* ---------- 大屏增强 ---------- */
@media (min-width: 1440px) {
  .page-faq {
    --faq-rail-w: 340px;
  }
  .page-faq .faq-group__title {
    font-size: 36px;
  }
}

/* ---------- 减弱动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq [data-reveal],
  .page-faq [data-reveal].is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-faq .qa__q::after,
  .page-faq .faq-scene__link {
    transition: none;
  }
}