.page-faq {
  --faq-card: #141C36;
  --faq-card-soft: rgba(20, 28, 54, 0.68);
  --faq-grid-dot: rgba(0, 229, 255, 0.2);
  --faq-glow-green: var(--c-green-glass);
  background: var(--c-bg);
  color: var(--c-white);
  line-height: 1.6;
}

/* ===== Hero 帮助中心首屏 ===== */
.page-faq-hero {
  position: relative;
  overflow: hidden;
  padding: 34px 0 0;
  background:
    radial-gradient(ellipse at 82% 4%, rgba(0, 255, 157, 0.1) 0%, transparent 52%),
    radial-gradient(ellipse at 12% 100%, rgba(0, 229, 255, 0.08) 0%, transparent 48%),
    linear-gradient(180deg, rgba(7, 10, 24, 0.1) 0%, rgba(7, 10, 24, 0.92) 100%);
}
.page-faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--faq-grid-dot) 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.46;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to right, transparent, #000 32%, #000 72%, transparent);
  mask-image: linear-gradient(to right, transparent, #000 32%, #000 72%, transparent);
}
.page-faq-hero__inner {
  position: relative;
}
.page-faq-hero__content {
  max-width: 880px;
  padding-bottom: 30px;
}
.page-faq-hero__crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--c-gray);
  margin-bottom: 18px;
}
.page-faq-hero__sep { opacity: 0.45; }
.page-faq-hero__badge {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.page-faq-hero__version {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  padding: 5px 12px 5px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-blue);
  background: var(--c-blue-glass);
}
.page-faq-hero h1 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: clamp(27px, 4.6vw, 45px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--c-white);
}
.page-faq-hero__lede {
  max-width: 700px;
  margin: 0 0 26px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-gray);
}
.page-faq-search {
  position: relative;
  max-width: 620px;
}
.page-faq-search input {
  width: 100%;
  max-width: 100%;
  background: rgba(11, 16, 38, 0.86);
  border: 1px solid var(--c-line);
  border-radius: 16px;
  padding: 16px 20px 16px 50px;
  color: var(--c-white);
  font-size: 15px;
  font-family: var(--font-body);
  transition: border-color var(--ease), box-shadow var(--ease), background var(--ease);
}
.page-faq-search input::placeholder { color: rgba(138, 148, 166, 0.72); }
.page-faq-search input:focus {
  outline: none;
  border-color: var(--c-green);
  background: rgba(11, 16, 38, 0.96);
  box-shadow: 0 0 0 4px var(--c-green-glass), 0 0 28px rgba(0, 255, 157, 0.12);
}
.page-faq-search::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 50%;
  width: 14px;
  height: 14px;
  border: 2px solid var(--c-green);
  border-radius: 50%;
  transform: translateY(-62%);
  pointer-events: none;
  box-sizing: border-box;
}
.page-faq-search::after {
  content: "";
  position: absolute;
  left: 29px;
  top: calc(50% + 1px);
  width: 8px;
  height: 2px;
  background: var(--c-green);
  transform: rotate(45deg);
  transform-origin: 0 50%;
  pointer-events: none;
}
.page-faq-search__hint {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--c-gray);
}
.page-faq-hero__banner {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 20px 20px 0 0;
  border: 1px solid var(--c-line);
  border-bottom: none;
  box-shadow: var(--shadow);
  background: var(--c-card);
}

/* ===== 热门问题 ===== */
.page-faq-hot {
  padding: 68px 0 10px;
  scroll-margin-top: calc(var(--header-h) + 20px);
}
.page-faq-hot .section-head { margin-bottom: 30px; }
.page-faq-hot .section-head__kicker { color: var(--c-green); }
.page-faq-hot__desc,
.page-faq-catalog__desc,
.page-faq-support__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-gray);
}
.page-faq-hot__grid {
  display: grid;
  gap: 12px;
  max-width: 860px;
  margin-inline: auto;
}

/* ===== 通用手风琴项 ===== */
.page-faq-item {
  background: var(--faq-card-soft);
  border: 1px solid var(--c-line);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color var(--ease), background var(--ease), box-shadow var(--ease);
}
.page-faq-item[open] {
  background: rgba(26, 35, 64, 0.86);
  border-color: var(--c-line-strong);
  box-shadow: 0 12px 30px -20px rgba(0, 0, 0, 0.7);
}
.page-faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 650;
  line-height: 1.5;
  color: var(--c-white);
  transition: color var(--ease);
}
.page-faq-item summary::-webkit-details-marker { display: none; }
.page-faq-item summary::after {
  content: "+";
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--c-line);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--c-green);
  transition: transform var(--ease), background var(--ease), border-color var(--ease);
}
.page-faq-item[open] summary { color: var(--c-green); }
.page-faq-item[open] summary::after {
  transform: rotate(135deg);
  background: var(--c-green-glass);
  border-color: rgba(0, 255, 157, 0.4);
}
.page-faq-item__body {
  padding: 0 22px 22px;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--c-gray);
}
.page-faq-item__body p { margin: 0; }
.page-faq-item__body strong {
  color: var(--c-white);
  font-weight: 650;
}
.page-faq-item__body a {
  color: var(--c-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.3);
  transition: color var(--ease), border-color var(--ease);
}
.page-faq-item__body a:hover {
  color: var(--c-green);
  border-color: var(--c-green);
}
.page-faq-mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
  color: var(--c-blue);
  background: var(--c-blue-glass);
  border-radius: 4px;
  padding: 2px 6px;
  white-space: nowrap;
}

/* ===== 分类检索 ===== */
.page-faq-catalog {
  padding: 68px 0 10px;
  scroll-margin-top: calc(var(--header-h) + 20px);
}
.page-faq-catalog .section-head__kicker { color: var(--c-green); }
.page-faq-catalog__layout {
  display: grid;
  gap: 34px;
  margin-top: 32px;
}
.page-faq-catalog__aside-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  padding-left: 10px;
  border-left: 2px solid var(--c-green);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-gray);
}
.page-faq-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-faq-index a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 42px 14px 16px;
  background: var(--faq-card-soft);
  border: 1px solid var(--c-line);
  border-radius: 12px;
  color: var(--c-white);
  text-decoration: none;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 600;
  transition: border-color var(--ease), background var(--ease), transform var(--ease);
}
.page-faq-index a::after {
  content: "→";
  position: absolute;
  right: 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-blue);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--ease), transform var(--ease);
}
.page-faq-index a:hover {
  border-color: var(--c-line-strong);
  background: var(--c-green-glass);
  transform: translateX(4px);
}
.page-faq-index a:hover::after {
  opacity: 1;
  transform: translateX(0);
}
.page-faq-index__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-green);
  min-width: 2em;
}
.page-faq-catalog__tip {
  display: flex;
  gap: 12px;
  margin-top: 24px;
  padding: 14px 18px;
  border-left: 2px solid var(--c-blue);
  border-radius: 0 12px 12px 0;
  background: var(--c-blue-glass);
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-gray);
}
.page-faq-catalog__tip-label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-blue);
}
.page-faq-catalog__tip p { margin: 0; }
.page-faq-catalog__main { min-width: 0; }

.page-faq-cat {
  scroll-margin-top: calc(var(--header-h) + 24px);
  margin-bottom: 52px;
}
.page-faq-cat:last-child { margin-bottom: 0; }
.page-faq-cat__title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-line);
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 750;
  color: var(--c-white);
}
.page-faq-cat__title span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 26px;
  padding: 0 8px;
  border: 1px solid rgba(0, 255, 157, 0.28);
  border-radius: 6px;
  background: var(--c-green-glass);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-green);
}
.page-faq-cat__media {
  margin-top: 22px;
  padding: 10px;
  border: 1px dashed rgba(0, 229, 255, 0.3);
  border-radius: 16px;
  background: rgba(20, 28, 54, 0.5);
}
.page-faq-cat__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  max-width: 600px;
  margin-inline: auto;
  border-radius: 10px;
  object-fit: cover;
}
.page-faq-cat__media-note {
  padding: 10px 8px 4px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-gray);
}

/* ===== 联系支持 ===== */
.page-faq-support {
  padding: 68px 0 80px;
  scroll-margin-top: calc(var(--header-h) + 20px);
}
.page-faq-support .section-head__kicker { color: var(--c-blue); }
.page-faq-support__grid {
  display: grid;
  gap: 14px;
  margin-top: 32px;
}
.page-faq-support__card {
  position: relative;
  overflow: hidden;
  padding: 22px 20px;
  border: 1px solid var(--c-line);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(32, 42, 74, 0.62), rgba(20, 28, 54, 0.78));
  transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}
.page-faq-support__card::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0;
  background: radial-gradient(ellipse at 82% -18%, var(--c-green-glass), transparent 70%);
  transition: opacity var(--ease);
  pointer-events: none;
}
.page-faq-support__card:hover {
  border-color: var(--c-line-strong);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}
.page-faq-support__card:hover::before { opacity: 1; }
.page-faq-support__card--primary {
  border-color: rgba(0, 255, 157, 0.34);
  background: linear-gradient(135deg, rgba(0, 255, 157, 0.1), rgba(20, 28, 54, 0.86));
}
.page-faq-support__label {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-green);
}
.page-faq-support__value {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-white);
  word-break: break-all;
}
.page-faq-support__meta {
  display: block;
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-gray);
}
.page-faq-support__guide {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 28px;
  padding: 24px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-blue-glass);
}
.page-faq-support__guide-text {
  flex: 1;
  min-width: 260px;
}
.page-faq-support__guide h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-white);
}
.page-faq-support__guide p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-gray);
}
.page-faq-support__guide a {
  color: var(--c-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.28);
  transition: color var(--ease), border-color var(--ease);
}
.page-faq-support__guide a:hover {
  color: var(--c-green);
  border-color: var(--c-green);
}

/* ===== 响应式：平板 / 桌面 ===== */
@media (min-width: 600px) {
  .page-faq-support__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq-hero {
    padding-top: 56px;
  }
  .page-faq-hero__content {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    column-gap: 48px;
    align-items: end;
  }
  .page-faq-hero__content .page-faq-hero__crumbs,
  .page-faq-hero__content .page-faq-hero__badge,
  .page-faq-hero__content h1,
  .page-faq-hero__content .page-faq-hero__lede,
  .page-faq-hero__content .page-faq-search {
    grid-column: 1;
  }
  .page-faq-hero__content .page-faq-hero__badge {
    grid-row: 1;
    grid-column: 2;
    margin: 0 0 12px;
  }
  .page-faq-hero__content::before {
    content: "HELP · ARCHIVE";
    grid-row: 2;
    grid-column: 2;
    align-self: end;
    justify-self: end;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.18em;
    color: rgba(0, 229, 255, 0.44);
    border: 1px solid var(--c-line);
    border-radius: 999px;
    padding: 6px 14px;
    white-space: nowrap;
  }
  .page-faq-hot__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    max-width: none;
  }
  .page-faq-catalog__layout {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
  .page-faq-catalog__aside {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
  .page-faq-catalog__main {
    border-left: 1px solid var(--c-line);
    padding-left: 32px;
  }
  .page-faq-support__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-faq-support__guide {
    padding: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition: none !important;
    animation: none !important;
  }
}