/* ================= 帮助中心 · page-faq ================= */

.page-faq {
  --faq-shadow: 5px 5px 0 rgba(7, 11, 34, .9);
  --faq-border: 2px solid var(--line);
  padding-bottom: var(--s-7);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: var(--s-4) 0 var(--s-3);
}

.page-faq .faq-hero .eyebrow {
  color: var(--cyan);
  letter-spacing: .14em;
}

.page-faq .faq-hero__title {
  margin: var(--s-2) 0 0;
  font-size: clamp(2.6rem, 9vw, 4.4rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--text);
}

.page-faq .faq-hero__title::after {
  content: "";
  display: block;
  width: 88px;
  height: 6px;
  margin-top: var(--s-3);
  background: linear-gradient(90deg, var(--purple), var(--amber));
}

.page-faq .faq-hero__lede {
  margin: var(--s-3) 0 0;
  max-width: 40em;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text);
}

.page-faq .faq-hero__figure {
  margin: var(--s-5) 0 0;
}

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

/* ---------- 分类筛选 ---------- */
.page-faq .faq-filter {
  margin-top: var(--s-5);
  padding-top: var(--s-3);
  border-top: var(--faq-border);
}

.page-faq .faq-filter__hint {
  margin: 0 0 var(--s-2);
  font-size: .8125rem;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-faq .filter-bar {
  display: flex;
  gap: var(--s-1);
  overflow-x: auto;
  padding: 4px 2px 10px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .filter-chip {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  border: 2px solid var(--line);
  border-radius: 2px;
  background: var(--ink-800);
  color: var(--text);
  font: inherit;
  font-size: .9375rem;
  font-weight: 600;
  letter-spacing: -.01em;
  white-space: nowrap;
  cursor: pointer;
  transition: border-color 180ms var(--ease), color 180ms var(--ease), background 180ms var(--ease);
}

.page-faq .filter-chip:hover {
  border-color: var(--purple-light);
  color: var(--purple-light);
}

.page-faq .filter-chip[aria-pressed="true"] {
  border-color: var(--amber);
  color: var(--amber);
  background: rgba(255, 184, 77, .08);
}

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

/* ---------- 主体骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s-4);
  margin-top: var(--s-4);
}

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

/* ---------- 分组 ---------- */
.page-faq .faq-sec {
  padding-top: var(--s-3);
  border-top: var(--faq-border);
  margin-bottom: var(--s-6);
}

.page-faq .faq-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: var(--s-2);
  row-gap: 6px;
  align-items: baseline;
  margin-bottom: var(--s-4);
}

.page-faq .faq-sec__num {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 7vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--purple);
}

.page-faq .faq-sec__title {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-size: clamp(1.35rem, 4vw, 1.9rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--text);
}

.page-faq .faq-sec__lede {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  max-width: 40em;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  border: var(--faq-border);
  background: var(--ink-800);
  box-shadow: var(--faq-shadow);
  margin-bottom: var(--s-2);
  transition: border-color 180ms var(--ease);
}

.page-faq .qa[open] {
  border-color: var(--purple);
}

.page-faq .qa__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  column-gap: var(--s-2);
  padding: 18px var(--s-2);
  list-style: none;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--text);
}

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

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

.page-faq .qa__idx {
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--purple-light);
  transition: color 180ms var(--ease);
}

.page-faq .qa[open] .qa__idx {
  color: var(--amber);
}

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

.page-faq .qa__icon {
  position: relative;
  flex: none;
  width: 22px;
  height: 22px;
  border: 2px solid var(--purple);
  transition: border-color 180ms var(--ease);
}

.page-faq .qa[open] .qa__icon {
  border-color: var(--amber);
}

.page-faq .qa__icon::before,
.page-faq .qa__icon::after {
  content: "";
  position: absolute;
  background: var(--purple);
  transition: transform 180ms var(--ease), background 180ms var(--ease);
}

.page-faq .qa__icon::before {
  left: 4px;
  right: 4px;
  top: 50%;
  height: 2px;
  transform: translateY(-50%);
}

.page-faq .qa__icon::after {
  top: 4px;
  bottom: 4px;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
}

.page-faq .qa[open] .qa__icon::before,
.page-faq .qa[open] .qa__icon::after {
  background: var(--amber);
}

.page-faq .qa[open] .qa__icon::after {
  transform: translateX(-50%) scaleY(0);
}

.page-faq .qa__a {
  border-top: 1px solid var(--line);
  padding: 16px var(--s-2) 20px;
  background: linear-gradient(180deg, rgba(108, 59, 255, .07), transparent 70%);
}

.page-faq .qa__a p {
  margin: 0 0 .85em;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--text);
}

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

.page-faq .qa__a .link {
  color: var(--cyan);
}

/* ---------- 分组内配图 ---------- */
.page-faq .qa-figure {
  margin: var(--s-3) 0 0;
  max-width: 420px;
}

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

/* ---------- 右侧问题目录 ---------- */
.page-faq .faq-toc {
  border: var(--faq-border);
  background: var(--ink-800);
  padding: var(--s-2);
}

.page-faq .faq-toc__title {
  margin: 0 0 var(--s-2);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-faq .faq-toc__list {
  display: flex;
  gap: var(--s-1);
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-toc__item {
  flex: 0 0 auto;
}

.page-faq .faq-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border: 2px solid transparent;
  border-radius: 2px;
  white-space: nowrap;
  font-size: .875rem;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-faq .faq-toc__num {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--purple-light);
  transition: color 180ms var(--ease);
}

.page-faq .faq-toc__link:hover {
  color: var(--text);
  border-color: var(--line);
}

.page-faq .faq-toc__link[aria-current="true"] {
  color: var(--amber);
  border-color: var(--amber);
  background: rgba(255, 184, 77, .09);
}

.page-faq .faq-toc__link[aria-current="true"] .faq-toc__num {
  color: var(--amber);
}

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

/* ---------- 中等屏 ---------- */
@media (min-width: 640px) {
  .page-faq .qa__a {
    padding-left: calc(var(--s-2) + 42px);
    padding-right: var(--s-4);
  }

  .page-faq .qa__q {
    padding: 20px var(--s-3);
  }
}

/* ---------- 桌面：目录常驻右侧 ---------- */
@media (min-width: 1040px) {
  .page-faq .faq-shell {
    grid-template-columns: minmax(0, 1fr) 236px;
    column-gap: var(--s-5);
    align-items: start;
  }

  .page-faq .faq-main {
    grid-column: 1;
    grid-row: 1;
  }

  .page-faq .faq-toc {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-toc__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-toc__item {
    flex: 1 1 auto;
  }

  .page-faq .faq-toc__link {
    display: flex;
    width: 100%;
    justify-content: flex-start;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .filter-chip,
  .page-faq .qa,
  .page-faq .qa__idx,
  .page-faq .qa__icon,
  .page-faq .qa__icon::before,
  .page-faq .qa__icon::after,
  .page-faq .faq-toc__link,
  .page-faq .faq-toc__num {
    transition: none;
  }
}