.page-faq {
  --faq-panel: rgba(12, 39, 64, 0.62);
  --faq-panel-low: rgba(12, 39, 64, 0.22);
  --faq-cyan-wash: rgba(47, 227, 210, 0.08);
  color: var(--mist);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(24px, 5vw, 48px) 0 clamp(32px, 5vw, 60px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 120px 120px;
  opacity: 0.3;
  -webkit-mask-image: radial-gradient(130% 100% at 18% 0%, #000 0%, transparent 78%);
  mask-image: radial-gradient(130% 100% at 18% 0%, #000 0%, transparent 78%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  align-items: center;
}

.page-faq .faq-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 7.4vw, 68px);
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--white);
  text-wrap: balance;
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-hero__figure {
  margin: 0;
  width: 100%;
}

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

/* ---------- 主体两栏 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  padding-top: clamp(30px, 5vw, 54px);
  padding-bottom: clamp(56px, 8vw, 96px);
}

/* ---------- 左栏索引 ---------- */
.page-faq .faq-index {
  position: sticky;
  top: 0;
  z-index: 30;
  padding: 12px 0 14px;
  background: var(--ink-900);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 8px;
  margin: 10px 0 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-faq .faq-index__link {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease), background 0.16s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: var(--faq-cyan-wash);
}

.page-faq .faq-index__no {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .faq-aside__block {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-aside__block--accent {
  border-top-color: var(--cyan);
}

.page-faq .faq-aside__links {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-aside__links li + li {
  margin-top: 2px;
}

.page-faq .faq-aside__links a {
  display: block;
  min-height: 44px;
  padding: 12px 2px;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
  transition: color 0.16s var(--ease), padding-left 0.16s var(--ease);
}

.page-faq .faq-aside__links a:hover,
.page-faq .faq-aside__links a:focus-visible {
  color: var(--cyan);
  padding-left: 8px;
}

.page-faq .faq-aside__tip {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--graphite);
}

/* ---------- 分类区块 ---------- */
.page-faq .faq-cat {
  scroll-margin-top: 96px;
}

.page-faq .faq-cat + .faq-cat {
  margin-top: clamp(44px, 6vw, 72px);
}

.page-faq .faq-cat__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-cat__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-faq .faq-cat__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.05;
  letter-spacing: -0.005em;
  color: var(--white);
}

.page-faq .faq-cat__intro {
  margin: 14px 0 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-faq .faq-cat__body {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: 6px;
}

.page-faq .faq-cat__figure {
  margin: 0;
  width: 100%;
}

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

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
  transition: background 0.18s var(--ease);
}

.page-faq .faq-item[open] {
  background: linear-gradient(180deg, var(--faq-panel), var(--faq-panel-low));
}

.page-faq .faq-item__q {
  position: relative;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  min-height: 44px;
  padding: 18px 44px 18px 2px;
  list-style: none;
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--white);
  transition: color 0.16s var(--ease);
}

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

.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible {
  color: var(--cyan-soft);
}

.page-faq .faq-item__q::before,
.page-faq .faq-item__q::after {
  content: "";
  position: absolute;
  right: 8px;
  top: 50%;
  width: 12px;
  height: 1.5px;
  background: var(--cyan);
  transform: translateY(-50%);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.page-faq .faq-item__q::before {
  transform: translateY(-50%) rotate(90deg);
}

.page-faq .faq-item[open] .faq-item__q::before {
  transform: translateY(-50%) rotate(0deg);
  opacity: 0;
}

.page-faq .faq-item__no {
  flex: 0 0 auto;
  padding-top: 4px;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-faq .faq-item__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-item__a {
  margin: 0 2px;
  padding: 16px 34px 22px 0;
  border-top: 1px solid var(--line-soft);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-item__a p {
  margin: 0;
}

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

.page-faq .faq-item__lead {
  color: var(--cyan-soft);
  font-weight: 600;
}

.page-faq .faq-item__a a,
.page-faq .faq-contact a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

/* ---------- 反馈块 ---------- */
.page-faq .faq-contact {
  margin-top: clamp(28px, 4vw, 40px);
  padding: 24px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: 2px;
  background: var(--faq-panel);
}

.page-faq .faq-contact__mail {
  margin: 12px 0 0;
  font-size: clamp(18px, 3.2vw, 24px);
  letter-spacing: 0.02em;
  color: var(--white);
  word-break: break-all;
}

.page-faq .faq-contact__note {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-faq .faq-contact__more {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-item__a {
    padding-left: 44px;
    padding-right: 56px;
  }

  .page-faq .faq-cat__body {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.62fr);
    align-items: start;
    gap: clamp(24px, 3.4vw, 40px);
  }

  .page-faq .faq-cat--device .faq-cat__items {
    display: grid;
    gap: 0;
  }

  .page-faq .faq-cat__figure {
    position: sticky;
    top: 96px;
  }
}

/* ---------- 桌面分屏 ---------- */
@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 32fr) minmax(0, 68fr);
    align-items: start;
  }

  .page-faq .faq-aside {
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-index {
    position: static;
    padding: 0;
    background: transparent;
    border-bottom: 0;
  }

  .page-faq .faq-index__list {
    display: block;
    margin: 12px 0 0;
    padding: 0;
    border-top: 1px solid var(--line);
    overflow: visible;
  }

  .page-faq .faq-index__link {
    display: flex;
    width: 100%;
    min-height: 46px;
    padding: 11px 2px;
    border: 0;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
    font-size: 15px;
    white-space: normal;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    background: transparent;
    padding-left: 10px;
  }

  .page-faq .faq-cat {
    scroll-margin-top: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__link,
  .page-faq .faq-aside__links a,
  .page-faq .faq-item,
  .page-faq .faq-item__q,
  .page-faq .faq-item__q::before,
  .page-faq .faq-item__q::after {
    transition: none;
  }
}