/* ============================================================
   帮助问答 · page-faq
   ============================================================ */

.page-faq {
  --faq-num-w: 46px;
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-faq .crumbs {
  padding-top: 26px;
}

.page-faq .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-faq .crumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-faq .crumbs li + li::before {
  content: "/";
  color: var(--line);
}

.page-faq .crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

.page-faq .crumbs a:hover,
.page-faq .crumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan-deep);
}

.page-faq .crumbs [aria-current="page"] {
  color: var(--cyan-deep);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: 26px;
  padding-bottom: 12px;
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 18px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 34px;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--text);
  max-width: 18ch;
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

/* 搜索框 */
.page-faq .faq-search {
  margin-top: 28px;
  padding: 18px 20px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.page-faq .faq-search__label {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-search__input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  padding: 11px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--night);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  transition: border-color var(--speed) var(--ease), box-shadow var(--speed) var(--ease);
}

.page-faq .faq-search__input::placeholder {
  color: var(--muted);
}

.page-faq .faq-search__input:hover {
  border-color: #4d7a6c;
}

.page-faq .faq-search__input:focus-visible {
  border-color: var(--cyan-deep);
  box-shadow: 0 0 0 3px rgba(47, 224, 174, 0.18);
}

.page-faq .faq-search__hint {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* 首屏配图 */
.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--night-2);
}

.page-faq .faq-hero__media::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(200deg, rgba(123, 247, 208, 0.16), transparent 46%);
  mix-blend-mode: screen;
  z-index: 1;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq .faq-hero__media figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: var(--night-2);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 主体布局：锚点栏 + 问答流 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-top: 40px;
  padding-bottom: 72px;
}

/* ---------- 左侧分类锚点 ---------- */
.page-faq .faq-rail {
  border-top: 2px solid var(--cyan-deep);
  padding-top: 16px;
}

.page-faq .faq-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  padding: 7px 0;
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan-deep);
}

.page-faq .faq-rail__n {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan-deep);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-rail__meta {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 问答流 ---------- */
.page-faq .faq-stream {
  display: flex;
  flex-direction: column;
  gap: 44px;
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: 104px;
  min-width: 0;
}

/* 分组标题带：玻璃质感 */
.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 4px 16px;
  margin-bottom: 16px;
  padding: 16px 20px 15px;
  border: 1px solid rgba(123, 247, 208, 0.2);
  border-radius: var(--radius);
  background:
    linear-gradient(118deg, rgba(28, 70, 56, 0.62) 0%, rgba(10, 35, 28, 0.42) 62%, rgba(5, 20, 15, 0.3) 100%);
  -webkit-backdrop-filter: blur(7px);
  backdrop-filter: blur(7px);
}

.page-faq .faq-group__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 32px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 21px;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-group__desc {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  margin-bottom: 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  transition: border-color var(--speed) var(--ease), background var(--speed) var(--ease), box-shadow var(--speed) var(--ease);
}

.page-faq .faq-item:hover {
  border-color: rgba(123, 247, 208, 0.42);
}

.page-faq .faq-item[open] {
  border-color: rgba(123, 247, 208, 0.62);
  background: linear-gradient(180deg, rgba(28, 70, 56, 0.58) 0%, var(--panel) 70%);
  box-shadow: inset 3px 0 0 var(--cyan-deep);
}

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: var(--faq-num-w) minmax(0, 1fr) 18px;
  align-items: start;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15.5px;
  line-height: 1.55;
  color: var(--text);
  transition: color var(--speed) var(--ease);
}

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

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

.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible {
  color: var(--cyan);
  outline: none;
}

.page-faq .faq-item__n {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.9;
  letter-spacing: 0.05em;
  color: var(--cyan-deep);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-item__t {
  min-width: 0;
}

/* 展开 / 收起指示 */
.page-faq .faq-item__sign {
  position: relative;
  width: 18px;
  height: 18px;
  align-self: center;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  background: var(--cyan-deep);
  transition: transform var(--speed) var(--ease), opacity var(--speed) var(--ease);
}

.page-faq .faq-item__sign::before {
  width: 14px;
  height: 2px;
}

.page-faq .faq-item__sign::after {
  width: 2px;
  height: 14px;
}

.page-faq .faq-item[open] .faq-item__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

/* 答案区 */
.page-faq .faq-item__a {
  padding: 0 18px 18px calc(var(--faq-num-w) + 30px);
}

.page-faq .faq-item[open] .faq-item__a {
  animation: faqReveal 190ms var(--ease) both;
}

@keyframes faqReveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-faq .faq-item__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(123, 247, 208, 0.35);
  transition: border-color var(--speed) var(--ease), color var(--speed) var(--ease);
}

.page-faq .faq-item__a a:hover,
.page-faq .faq-item__a a:focus-visible {
  color: var(--cyan-deep);
  border-bottom-color: var(--cyan-deep);
}

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-hot {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-mono {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--text);
  word-break: break-all;
}

/* ---------- 数据字段组横幅图 ---------- */
.page-faq .faq-banner {
  margin: 0 0 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--night-2);
}

.page-faq .faq-banner img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  max-height: 270px;
  object-fit: cover;
}

.page-faq .faq-banner figcaption {
  padding: 10px 16px;
  border-top: 1px solid var(--line);
  background: var(--night-2);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 末组：联系方式与行动 ---------- */
.page-faq .faq-group--last .faq-group__head {
  border-color: rgba(255, 176, 32, 0.28);
  background:
    linear-gradient(118deg, rgba(28, 70, 56, 0.66) 0%, rgba(10, 35, 28, 0.46) 100%);
}

.page-faq .faq-group--last .faq-group__num {
  color: var(--amber);
}

.page-faq .faq-help {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--line);
}

.page-faq .faq-help__item {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: var(--panel);
}

.page-faq .faq-help__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-help__value {
  font-family: var(--font-mono);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--cyan);
  text-decoration: none;
  word-break: break-all;
  border-bottom: 1px solid transparent;
  transition: color var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

.page-faq .faq-help__value:hover,
.page-faq .faq-help__value:focus-visible {
  color: var(--cyan-deep);
  border-bottom-color: var(--cyan-deep);
}

.page-faq .faq-help__value--plain {
  font-family: var(--font-body);
  color: var(--muted);
  border-bottom: none;
}

.page-faq .faq-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-hero h1 {
    font-size: 46px;
  }

  .page-faq .faq-help {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-help__item--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding-top: 34px;
    padding-bottom: 16px;
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 1fr);
    gap: 56px;
    align-items: end;
  }

  .page-faq .faq-hero h1 {
    font-size: 60px;
    line-height: 1.04;
  }

  .page-faq .faq-hero__lede {
    font-size: 17px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 56px;
    padding-top: 56px;
    padding-bottom: 96px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 100px;
  }

  .page-faq .faq-rail__list {
    display: block;
  }

  .page-faq .faq-rail__link {
    display: flex;
  }

  .page-faq .faq-group__num {
    font-size: 40px;
  }

  .page-faq .faq-group__title {
    font-size: 26px;
  }

  .page-faq .faq-item__q {
    font-size: 16.5px;
    padding: 18px 20px;
  }

  .page-faq .faq-item__a {
    padding: 0 20px 20px calc(var(--faq-num-w) + 32px);
  }

  .page-faq .faq-item__a p {
    font-size: 15px;
  }

  .page-faq .faq-banner img {
    max-height: 300px;
  }

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

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] .faq-item__a {
    animation: none;
  }

  .page-faq .faq-item__sign::before,
  .page-faq .faq-item__sign::after {
    transition: none;
  }
}