/* ===== 常见问答 · 页面专属样式（作用域 .page-faq） ===== */

.page-faq {
  --faq-line: rgba(34, 48, 79, .9);
  --faq-grid: 24px;
  --faq-gap: clamp(16px, 2.4vw, 28px);
  padding-bottom: clamp(40px, 7vw, 88px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  border-bottom: 1px solid var(--line);
  padding: clamp(22px, 4vw, 44px) 0 clamp(32px, 5.5vw, 64px);
  background:
    radial-gradient(120% 90% at 88% -12%, rgba(138, 92, 255, .20), transparent 62%),
    radial-gradient(90% 80% at 4% 4%, rgba(53, 224, 208, .12), transparent 58%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, var(--faq-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--faq-line) 1px, transparent 1px);
  background-size: var(--faq-grid) var(--faq-grid);
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, .38) 58%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, .38) 58%, transparent 100%);
  opacity: .55;
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(18px, 3vw, 32px);
}

.page-faq .faq-hero__copy .display {
  margin: 10px 0 0;
  line-height: 1.12;
}

.page-faq .faq-hero__copy .lead {
  margin-top: clamp(14px, 2vw, 20px);
  max-width: 36em;
}

.page-faq .faq-hero__points {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-hero__points li {
  position: relative;
  padding-left: 24px;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--text-dim);
}

.page-faq .faq-hero__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 14px;
  height: 1px;
  background: var(--cyan);
}

.page-faq .faq-hero__media {
  margin: 0;
}

.page-faq .media-frame {
  overflow: hidden;
}

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

/* ---------- 快速索引 ---------- */
.page-faq .faq-index {
  padding-top: clamp(36px, 6vw, 72px);
}

.page-faq .faq-index__head {
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-faq .faq-index__head .editorial {
  margin: 0 0 8px;
}

.page-faq .faq-index__head p {
  margin: 0;
  max-width: 40em;
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-index__item {
  background-color: var(--surface);
  min-width: 0;
}

.page-faq .faq-index__link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  padding: 18px 18px 20px;
  color: var(--text);
  text-decoration: none;
  transition: background-color .22s var(--ease), transform .22s var(--ease);
}

.page-faq .faq-index__link::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cyan);
  transform: scaleY(.12);
  transform-origin: top center;
  transition: transform .3s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  background-color: var(--surface-2);
  transform: translateY(-2px);
}

.page-faq .faq-index__link:hover::after,
.page-faq .faq-index__link:focus-visible::after {
  transform: scaleY(1);
}

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

.page-faq .faq-index__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-faq .faq-index__no {
  color: var(--gold);
  font-size: var(--fs-sm);
  letter-spacing: .12em;
}

.page-faq .faq-index__count {
  font-size: var(--fs-xs);
  color: var(--text-dim);
  letter-spacing: .08em;
}

.page-faq .faq-index__name {
  font-family: var(--font-sans);
  font-size: var(--fs-md);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.35;
}

.page-faq .faq-index__desc {
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 问答章节 ---------- */
.page-faq .faq-block {
  padding: clamp(36px, 6vw, 76px) 0 0;
  scroll-margin-top: 84px;
}

.page-faq .faq-block + .faq-block {
  border-top: 1px solid var(--line);
  margin-top: clamp(36px, 6vw, 72px);
}

.page-faq .faq-block__head {
  display: grid;
  gap: 8px;
  max-width: 46em;
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-faq .chapter-no {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  letter-spacing: .16em;
  color: var(--gold);
}

.page-faq .faq-block__head .editorial {
  margin: 0;
}

.page-faq .faq-block__lede {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--text-dim);
}

.page-faq .faq-block__body {
  display: grid;
  gap: clamp(22px, 3.5vw, 40px);
  min-width: 0;
}

/* ---------- 折叠面板 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
  min-width: 0;
}

.page-faq .faq {
  position: relative;
  background-color: var(--surface-2);
  border-left: 2px solid transparent;
  transition: border-left-color .22s var(--ease), background-color .22s var(--ease);
}

.page-faq .faq:hover {
  background-color: var(--surface);
}

.page-faq .faq[open] {
  border-left-color: var(--cyan);
  background-color: var(--surface);
}

.page-faq .faq:focus-within {
  border-left-color: var(--cyan);
}

.page-faq .faq__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  font-weight: 600;
  line-height: 1.65;
  letter-spacing: -.005em;
  transition: color .2s var(--ease);
}

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

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

.page-faq .faq__q::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  font-weight: 400;
  line-height: 1;
  color: var(--gold);
  transition: color .2s var(--ease);
}

.page-faq .faq[open] .faq__q::after {
  content: "\2013";
  color: var(--cyan);
}

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

.page-faq .faq__q-text {
  min-width: 0;
}

.page-faq .faq__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  line-height: 1.6;
  letter-spacing: .06em;
  color: var(--gold);
  border: 1px solid var(--line);
  padding: 0 5px;
}

.page-faq .faq__a {
  padding: 0 16px 18px 16px;
  font-size: var(--fs-sm);
  line-height: 1.78;
  color: var(--text-dim);
}

.page-faq .faq__a p {
  margin: 0 0 10px;
  max-width: 40em;
}

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

.page-faq .faq__steps {
  counter-reset: faqstep;
  list-style: none;
  margin: 4px 0 12px;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-faq .faq__steps li {
  counter-increment: faqstep;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.page-faq .faq__steps li::before {
  content: counter(faqstep);
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  line-height: 1;
  color: var(--ink-900);
  background-color: var(--cyan);
}

/* ---------- 侧栏与示意图 ---------- */
.page-faq .faq-side {
  display: grid;
  gap: 12px;
  align-content: start;
  min-width: 0;
}

.page-faq .faq-side__media {
  margin: 0;
}

.page-faq .faq-side__cap {
  margin: 0;
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: var(--text-dim);
  border-left: 2px solid var(--gold);
  padding-left: 10px;
}

.page-faq .faq-figure {
  margin: 0;
  padding: clamp(16px, 2.5vw, 24px);
  border: 1px solid var(--line);
  background-color: var(--surface);
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-faq .faq-figure__svg {
  display: block;
  width: 100%;
  max-width: 380px;
  height: auto;
}

.page-faq .faq-figure__cap {
  font-size: var(--fs-xs);
  letter-spacing: .06em;
  color: var(--text-dim);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-help {
  margin-top: clamp(40px, 7vw, 88px);
  padding: clamp(32px, 5.5vw, 64px) 0 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 84px;
}

.page-faq .faq-help__inner {
  display: grid;
  gap: 14px;
  max-width: 62em;
}

.page-faq .faq-help__inner .editorial {
  margin: 0;
}

.page-faq .faq-help__text {
  margin: 0;
  font-size: var(--fs-base);
  line-height: 1.78;
  color: var(--text-dim);
  max-width: 40em;
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.page-faq .faq-help__meta {
  margin: clamp(16px, 2.5vw, 26px) 0 0;
  display: grid;
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-help__row {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background-color: var(--surface);
}

.page-faq .faq-help__key {
  margin: 0;
  font-size: var(--fs-xs);
  letter-spacing: .1em;
  color: var(--gold);
}

.page-faq .faq-help__val {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--text);
  overflow-wrap: anywhere;
}

.page-faq .faq-help__more {
  margin: 4px 0 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .faq-help__more a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--gold);
  text-underline-offset: 4px;
}

.page-faq .faq-help__more a:hover,
.page-faq .faq-help__more a:focus-visible {
  color: var(--cyan);
  text-decoration-color: var(--cyan);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq__q {
    padding: 17px 20px;
  }

  .page-faq .faq__a {
    padding: 0 20px 20px 20px;
  }

  .page-faq .faq-help__row {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
    padding: 15px 18px;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
  }

  .page-faq .faq-block__body--split {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-index__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__link,
  .page-faq .faq-index__link::after,
  .page-faq .faq,
  .page-faq .faq__q::after {
    transition: none;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    transform: none;
  }
}