/* =========================================================
   帮助中心 · 页面专属样式（作用域：.page-faq）
   ========================================================= */

.page-faq {
  position: relative;
  background: var(--field);
  overflow-x: hidden;
}

.page-faq .faq-hero {
  position: relative;
  padding: 24px 0 0;
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  left: -12%;
  right: -12%;
  height: 68%;
  background:
    radial-gradient(58% 78% at 78% 10%, rgba(200, 255, 61, 0.11), transparent 68%),
    radial-gradient(48% 66% at 10% 0%, rgba(56, 224, 208, 0.09), transparent 70%);
  pointer-events: none;
}

.page-faq .faq-hero > .shell {
  position: relative;
  z-index: 1;
}

/* ---------- 首屏文字 ---------- */
.page-faq .faq-hero__head {
  max-width: 60ch;
  margin-top: 22px;
}

.page-faq .faq-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 7.6vw, 80px);
  line-height: 1.0;
  letter-spacing: -0.018em;
  color: var(--fog);
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 44ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist);
}

/* ---------- 首屏图 ---------- */
.page-faq .faq-hero__figure {
  margin: 34px 0 0;
  border: 1px solid var(--grid);
  background: var(--stand);
}

.page-faq .faq-hero__figure .figure__media {
  overflow: hidden;
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) brightness(0.86);
}

.page-faq .faq-hero__figure .figure__caption,
.page-faq .faq-figure .figure__caption {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 14px;
  border-top: 1px solid var(--grid);
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

.page-faq .figure__index {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--signal);
  flex: 0 0 auto;
}

/* ---------- 主体区 ---------- */
.page-faq .faq-guide {
  padding-top: 60px;
}

.page-faq .faq-guide__head {
  margin-bottom: 30px;
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

/* ---------- 索引列 ---------- */
.page-faq .faq-index {
  border: 1px solid var(--grid);
  background: rgba(22, 34, 74, 0.42);
  padding: 14px 12px;
}

.page-faq .faq-index__label {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--mist);
}

.page-faq .faq-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  border-left: 3px solid transparent;
  color: var(--fog);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: border-color 120ms var(--ease), background-color 120ms var(--ease), color 120ms var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-left-color: var(--signal);
  background: rgba(200, 255, 61, 0.07);
  color: var(--signal);
  outline: none;
}

.page-faq .faq-index__num {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--signal);
}

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

/* ---------- 答案列 ---------- */
.page-faq .faq-answers {
  display: grid;
  gap: 40px;
  min-width: 0;
}

.page-faq .faq-group {
  min-width: 0;
  scroll-margin-top: 84px;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--grid);
}

.page-faq .faq-group__num {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--signal);
  flex: 0 0 auto;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.4vw, 28px);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.25;
  color: var(--fog);
}

/* ---------- 折叠问题项 ---------- */
.page-faq .faq-item {
  border: 1px solid var(--grid);
  background: var(--stand);
  margin-bottom: 10px;
  transition: border-color 120ms var(--ease), background-color 120ms var(--ease);
}

.page-faq .faq-item:hover {
  border-color: rgba(200, 255, 61, 0.42);
}

.page-faq .faq-item[open] {
  border-color: rgba(200, 255, 61, 0.55);
  background: linear-gradient(180deg, rgba(200, 255, 61, 0.045), rgba(200, 255, 61, 0) 42%), var(--stand);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.65;
  color: var(--fog);
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__marker {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 8px;
  background: var(--grid);
  transition: background-color 120ms var(--ease);
}

.page-faq .faq-item__q:hover .faq-item__marker,
.page-faq .faq-item[open] .faq-item__marker {
  background: var(--signal);
}

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

.page-faq .faq-item__q::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 18px;
  line-height: 1.3;
  color: var(--mist);
  transition: color 120ms var(--ease);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "–";
  color: var(--signal);
}

.page-faq .faq-item__a {
  border-top: 1px solid rgba(36, 53, 107, 0.85);
  padding: 14px 18px 18px 36px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

.page-faq .faq-item__a p {
  margin: 0 0 12px;
}

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

.page-faq .faq-item__a a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.42);
  transition: border-color 120ms var(--ease);
}

.page-faq .faq-item__a a:hover {
  border-bottom-color: var(--signal);
}

/* ---------- 答案内列表 ---------- */
.page-faq .faq-list {
  margin: 0 0 12px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-faq .faq-list li {
  position: relative;
  padding-left: 16px;
}

.page-faq .faq-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 7px;
  height: 1px;
  background: var(--signal);
}

.page-faq .faq-list strong {
  color: var(--fog);
  font-weight: 600;
}

/* ---------- 答案旁示意图 ---------- */
.page-faq .faq-figure {
  margin: 20px 0 0;
  border: 1px solid var(--grid);
  background: var(--relay);
}

.page-faq .faq-figure .figure__media {
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(1.05) brightness(0.9);
}

/* ---------- 末组强调 ---------- */
.page-faq .faq-group--contact .faq-group__head {
  border-bottom-color: rgba(200, 255, 61, 0.5);
}

.page-faq .faq-group--contact .faq-item[open] {
  border-color: rgba(56, 224, 208, 0.55);
  background: linear-gradient(180deg, rgba(56, 224, 208, 0.06), rgba(56, 224, 208, 0) 42%), var(--stand);
}

/* =========================================================
   断点
   ========================================================= */

@media (min-width: 700px) {
  .page-faq .faq-hero {
    padding-top: 36px;
  }

  .page-faq .faq-hero__figure {
    margin-top: 44px;
  }

  .page-faq .faq-guide {
    padding-top: 84px;
  }

  .page-faq .faq-guide__head {
    margin-bottom: 40px;
  }

  .page-faq .faq-answers {
    gap: 52px;
  }

  .page-faq .faq-item__q {
    padding: 17px 22px;
    font-size: 17px;
  }

  .page-faq .faq-item__a {
    padding: 16px 44px 22px 42px;
    font-size: 16px;
  }

  .page-faq .faq-figure {
    margin-top: 26px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 84px;
  }

  .page-faq .faq-item__a {
    padding-right: 64px;
    max-width: 62ch;
  }

  .page-faq .faq-figure {
    max-width: 560px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-hero__head {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }

  .page-faq .faq-hero__title {
    max-width: 16ch;
  }

  .page-faq .faq-layout {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 72px;
  }
}

/* =========================================================
   动效降级
   ========================================================= */

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