.page-faq {
  --faq-gap: 16px;
  --faq-offset: 104px;
}

/* ============ 首屏 ============ */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(26px, 4vw, 44px);
  border-bottom: 1px solid var(--ink-700);
  background:
    radial-gradient(760px 300px at 8% 0%, rgba(255, 107, 44, 0.14), transparent 72%),
    radial-gradient(620px 280px at 88% 20%, rgba(44, 229, 200, 0.09), transparent 74%),
    linear-gradient(180deg, var(--ink-800), var(--ink-900));
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(20, 42, 66, 0.7) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20, 42, 66, 0.7) 1px, transparent 1px);
  background-size: 80px 80px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 14px;
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero__title {
  margin: 0 0 16px;
  max-width: 20ch;
  font-size: var(--fs-h1);
  line-height: 1.16;
  letter-spacing: -0.012em;
  color: var(--fog);
}

.page-faq .faq-hero__lead {
  margin: 0 0 26px;
  max-width: 60ch;
  line-height: 1.75;
  color: var(--slate);
}

.page-faq .faq-hero__lead strong {
  color: var(--fog);
  font-weight: 700;
}

.page-faq .faq-hero__tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
}

.page-faq .faq-hero__hint {
  margin: 0;
  font-size: var(--fs-xs);
  letter-spacing: 0.05em;
  color: var(--slate);
}

/* 关键词输入 */
.page-faq .faq-search {
  position: relative;
  flex: 1 1 260px;
  max-width: 400px;
}

.page-faq .faq-search::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 50%;
  width: 11px;
  height: 11px;
  margin-top: -8px;
  border: 1.5px solid var(--slate);
  border-radius: 50%;
  pointer-events: none;
}

.page-faq .faq-search::after {
  content: "";
  position: absolute;
  left: 27px;
  top: 50%;
  width: 6px;
  height: 1.5px;
  margin-top: 1px;
  background: var(--slate);
  transform: rotate(45deg);
  transform-origin: left center;
  pointer-events: none;
}

.page-faq .faq-search__input {
  width: 100%;
  padding: 12px 18px 12px 42px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-pill);
  background: var(--ink-800);
  color: var(--fog);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.4;
  outline: none;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

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

.page-faq .faq-search__input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(44, 229, 200, 0.16);
}

/* ============ 两列骨架 ============ */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  padding-top: clamp(28px, 5vw, 52px);
  padding-bottom: clamp(48px, 8vw, 96px);
  min-width: 0;
}

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

/* ============ 分类索引 ============ */
.page-faq .faq-side {
  min-width: 0;
}

.page-faq .faq-side__title {
  margin: 0 0 10px;
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-faq .faq-side__list {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-side__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-pill);
  background: var(--ink-800);
  color: var(--fog);
  font-size: var(--fs-xs);
  line-height: 1.5;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-side__no {
  color: var(--slate);
  font-size: 0.75rem;
  transition: color var(--dur) var(--ease);
}

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

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

.page-faq .faq-side__link.is-active {
  border-color: var(--signal);
  color: var(--signal);
}

.page-faq .faq-side__link.is-active .faq-side__no {
  color: var(--signal);
}

.page-faq .faq-side__deco {
  display: none;
  margin: 24px 0 0;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink-800);
  opacity: 0.6;
}

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

/* ============ 问答分组 ============ */
.page-faq .faq-group {
  scroll-margin-top: var(--faq-offset);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(34px, 5vw, 58px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ink-700);
}

.page-faq .faq-group__idx {
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  color: var(--signal);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: var(--fs-h3);
  line-height: 1.35;
  color: var(--fog);
}

.page-faq .faq-group__note {
  margin: 12px 0 18px;
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: var(--slate);
}

.page-faq .faq-group--signal .faq-group__idx { color: var(--signal); }
.page-faq .faq-group--cyan .faq-group__idx { color: var(--cyan); }
.page-faq .faq-group--violet .faq-group__idx { color: var(--violet); }
.page-faq .faq-group--amber .faq-group__idx { color: var(--amber); }
.page-faq .faq-group--mint .faq-group__idx { color: var(--mint); }

/* ============ 问答卡片 ============ */
.page-faq .faq-card {
  position: relative;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
  background: var(--ink-800);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-card + .faq-card {
  margin-top: var(--faq-gap);
}

.page-faq .faq-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--signal);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform var(--dur) var(--ease);
}

.page-faq .faq-card:hover {
  border-color: var(--ink-600);
}

.page-faq .faq-card[open] {
  border-color: rgba(255, 107, 44, 0.45);
  background: #0d2135;
}

.page-faq .faq-card[open]::before {
  transform: scaleY(1);
}

.page-faq .faq-card__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  color: var(--fog);
  font-weight: 600;
  font-size: var(--fs-body);
  line-height: 1.5;
  transition: color var(--dur) var(--ease);
}

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

.page-faq .faq-card__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}

.page-faq .faq-card[open] .faq-card__q {
  color: var(--signal);
}

.page-faq .faq-card__code {
  flex: 0 0 auto;
  padding: 2px 9px;
  border: 1px solid rgba(255, 194, 75, 0.32);
  border-radius: var(--radius-pill);
  background: rgba(255, 194, 75, 0.1);
  color: var(--amber);
  font-size: var(--fs-xs);
  font-weight: 400;
  line-height: 1.7;
  letter-spacing: 0.04em;
}

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

.page-faq .faq-card__chev {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: 6px;
  border-right: 1.5px solid var(--slate);
  border-bottom: 1.5px solid var(--slate);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-card[open] .faq-card__chev {
  transform: rotate(-135deg);
  border-color: var(--signal);
}

.page-faq .faq-card__a {
  padding: 14px 18px 18px;
  border-top: 1px solid var(--ink-700);
  color: var(--slate);
  line-height: 1.75;
  font-size: var(--fs-body);
}

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

/* ============ 辅助图示 ============ */
.page-faq .faq-figure {
  margin: 0 0 20px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-faq .faq-figure .media__caption {
  padding: 10px 16px;
  border-top: 1px solid var(--ink-700);
  color: var(--slate);
  font-size: var(--fs-xs);
  line-height: 1.6;
}

/* ============ 求助卡 ============ */
.page-faq .faq-assist {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 20px;
  padding: 22px 20px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(91, 227, 154, 0.08), rgba(11, 29, 48, 0.9) 62%);
}

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

.page-faq .faq-assist__text {
  margin: 0 0 14px;
  color: var(--fog);
  line-height: 1.7;
}

.page-faq .faq-assist__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 0;
}

.page-faq .faq-assist__link {
  color: var(--cyan);
  font-size: var(--fs-xs);
  line-height: 1.7;
  text-decoration: none;
  border-bottom: 1px solid rgba(44, 229, 200, 0.35);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-assist__link:hover,
.page-faq .faq-assist__link:focus-visible {
  color: var(--fog);
  border-color: var(--fog);
  outline: none;
}

.page-faq .faq-assist .btn {
  align-self: flex-start;
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-faq .faq-card__q {
    padding: 18px 22px;
  }

  .page-faq .faq-card__a {
    padding: 16px 22px 22px;
  }

  .page-faq .faq-assist {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 26px 28px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-faq .faq-side {
    position: sticky;
    top: var(--faq-offset);
    align-self: start;
  }

  .page-faq .faq-side__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-side__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-pill) var(--radius-pill) 0;
    background: transparent;
    padding: 9px 12px;
    white-space: normal;
    line-height: 1.6;
  }

  .page-faq .faq-side__link.is-active {
    border-left-color: var(--signal);
    background: rgba(255, 107, 44, 0.1);
  }

  .page-faq .faq-side__link:hover,
  .page-faq .faq-side__link:focus-visible {
    border-left-color: var(--cyan);
    background: rgba(44, 229, 200, 0.07);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-card,
  .page-faq .faq-card::before,
  .page-faq .faq-card__chev,
  .page-faq .faq-card__q,
  .page-faq .faq-side__link,
  .page-faq .faq-side__no,
  .page-faq .faq-search__input,
  .page-faq .faq-assist__link {
    transition-duration: 0.01ms;
  }
}