.page-faq {
  --faq-hair: rgba(244, 239, 226, 0.14);
  --faq-hair-soft: rgba(244, 239, 226, 0.26);
  --faq-text-soft: rgba(244, 239, 226, 0.78);
  --faq-ink-text: rgba(32, 28, 20, 0.78);
  background: var(--paper);
  color: var(--brown);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 28px 0 44px;
  background: var(--ink-900);
  color: var(--paper);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 84% -12%, rgba(201, 242, 77, 0.18), transparent 62%),
    radial-gradient(80% 70% at -6% 112%, rgba(255, 90, 33, 0.14), transparent 60%),
    repeating-linear-gradient(112deg, rgba(255, 255, 255, 0.035) 0 2px, transparent 2px 10px);
  pointer-events: none;
}

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

.page-faq .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  font-size: 0.8125rem;
}

.page-faq .breadcrumb li {
  color: var(--steel);
}

.page-faq .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: rgba(140, 163, 156, 0.7);
}

.page-faq .breadcrumb a {
  color: var(--faq-text-soft);
  text-decoration: none;
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--lime);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: 30px;
}

.page-faq .faq-hero .eyebrow {
  color: var(--lime);
  margin: 0 0 12px;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 7.4vw, 3.9rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  max-width: 17ch;
}

.page-faq .faq-hero .lede {
  max-width: 54ch;
  margin: 0;
  font-size: 1rem;
  line-height: 1.62;
  color: var(--faq-text-soft);
}

.page-faq .faq-hero__stats {
  display: grid;
  gap: 14px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__stats li {
  padding-top: 10px;
  border-top: 1px solid var(--faq-hair-soft);
  font-size: 0.8125rem;
  line-height: 1.5;
  color: rgba(244, 239, 226, 0.68);
}

.page-faq .faq-hero__stats b {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 1.1875rem;
  letter-spacing: 0.02em;
  color: var(--lime);
}

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

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-faq .faq-hero__media .annotation {
  color: var(--steel);
}

/* ---------- 主体：左树右答 ---------- */
.page-faq .faq-body {
  padding: 40px 0 56px;
  background: var(--ink-900);
  color: var(--paper);
}

.page-faq .faq-layout {
  display: grid;
  gap: 32px;
}

/* 左侧问题树 */
.page-faq .faq-tree {
  position: relative;
  padding: 22px 18px;
  background: var(--ink-800);
  border: 1px solid var(--faq-hair);
  overflow: hidden;
}

.page-faq .faq-tree__bg {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0.18;
  pointer-events: none;
}

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

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

.page-faq .faq-tree__inner .annotation {
  color: var(--steel);
}

.page-faq .faq-tree__list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-tree__item {
  position: relative;
  padding-left: 22px;
}

.page-faq .faq-tree__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0;
  height: 100%;
  width: 1px;
  background: rgba(201, 242, 77, 0.3);
}

.page-faq .faq-tree__item:first-child::before {
  top: 18px;
}

.page-faq .faq-tree__item:last-child::before {
  height: 18px;
}

.page-faq .faq-tree__link {
  position: relative;
  display: block;
  padding: 9px 0;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-faq .faq-tree__link::before {
  content: "";
  position: absolute;
  left: -21px;
  top: 15px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--lime);
  border-radius: 50%;
  background: var(--ink-800);
  transition: background 0.2s var(--ease);
}

.page-faq .faq-tree__link span {
  display: block;
  margin-top: 3px;
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--steel);
}

.page-faq .faq-tree__link:hover,
.page-faq .faq-tree__link:focus-visible {
  color: var(--lime);
}

.page-faq .faq-tree__link:hover::before,
.page-faq .faq-tree__link:focus-visible::before {
  background: var(--lime);
}

.page-faq .faq-tree__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(201, 242, 77, 0.25);
  font-size: 0.8125rem;
  line-height: 1.58;
  color: var(--steel);
}

/* 右侧答案面板 */
.page-faq .faq-answers > .faq-group:last-child {
  margin-bottom: 0;
}

.page-faq .faq-group {
  margin-bottom: 22px;
  padding: 20px 18px 8px;
  background: var(--glass);
  border: 1px solid var(--faq-hair);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  scroll-margin-top: 92px;
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 4px;
}

.page-faq .faq-group__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.375rem;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--ember);
}

.page-faq .faq-group h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.1875rem;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.page-faq .faq-group__note {
  margin: 6px 0 12px;
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--steel);
}

.page-faq .faq-group__tools {
  display: flex;
  justify-content: flex-end;
  margin: 0 0 6px;
}

.page-faq .copy-btn {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

/* 手风琴条目 */
.page-faq .faq-item {
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 0;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
  transition: color 0.2s var(--ease);
}

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

.page-faq .faq-item summary::before {
  content: "+";
  flex: 0 0 auto;
  width: 16px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  line-height: 1.3;
  color: var(--lime);
}

.page-faq .faq-item[open] summary::before {
  content: "–";
  color: var(--ember);
}

.page-faq .faq-item summary:hover {
  color: var(--lime-soft);
}

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

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

.page-faq .faq-item__body {
  padding: 0 0 16px 28px;
  animation: faq-rise 0.3s var(--ease) both;
}

.page-faq .faq-item__body p {
  margin: 0 0 10px;
  font-size: 0.9375rem;
  line-height: 1.62;
  color: var(--faq-text-soft);
}

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

.page-faq .faq-item__body a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-item__body a:hover,
.page-faq .faq-item__body a:focus-visible {
  color: var(--lime-soft);
}

.page-faq .faq-steps {
  margin: 12px 0 14px;
  padding: 0;
  list-style: none;
  counter-reset: faq-step;
}

.page-faq .faq-steps li {
  position: relative;
  counter-increment: faq-step;
  padding-left: 32px;
  margin-bottom: 8px;
  font-size: 0.9375rem;
  line-height: 1.58;
  color: var(--faq-text-soft);
}

.page-faq .faq-steps li::before {
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border: 1px solid var(--ember);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ember);
}

@keyframes faq-rise {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 尾部：纸底求助区 ---------- */
.page-faq .faq-tail {
  padding: 44px 0 60px;
  background: var(--paper);
  color: var(--brown);
}

.page-faq .faq-tail .faq-group {
  margin: 0 0 30px;
  padding: 0;
  background: transparent;
  border: 0;
  border-top: 1px solid rgba(32, 28, 20, 0.2);
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  padding-top: 26px;
}

.page-faq .faq-tail .faq-group h2 {
  font-size: clamp(1.375rem, 4vw, 1.875rem);
  color: var(--brown);
}

.page-faq .faq-tail .faq-group__note {
  color: rgba(32, 28, 20, 0.62);
  font-size: 0.875rem;
}

.page-faq .faq-tail .faq-item {
  border-top-color: rgba(32, 28, 20, 0.16);
}

.page-faq .faq-tail .faq-item summary {
  color: var(--brown);
}

.page-faq .faq-tail .faq-item summary:hover {
  color: var(--ember);
}

.page-faq .faq-tail .faq-item__body p {
  color: var(--faq-ink-text);
}

.page-faq .faq-tail .faq-item__body a {
  color: #B33A12;
}

.page-faq .faq-tail .faq-item__body a:hover,
.page-faq .faq-tail .faq-item__body a:focus-visible {
  color: var(--ember);
}

.page-faq .faq-tail__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-tail .btn--ghost {
  border-color: rgba(32, 28, 20, 0.35);
  color: var(--brown);
}

.page-faq .faq-tail .btn--ghost:hover,
.page-faq .faq-tail .btn--ghost:focus-visible {
  border-color: var(--ember);
  color: var(--ember);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-faq .faq-hero__stats b {
    font-size: 1.25rem;
  }

  .page-faq .faq-group {
    padding: 24px 24px 10px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: 36px 0 60px;
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: end;
    gap: 52px;
  }

  .page-faq .faq-hero__media img {
    aspect-ratio: 5 / 4;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    padding: 56px 0 72px;
  }

  .page-faq .faq-layout {
    grid-template-columns: minmax(230px, 292px) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-faq .faq-tree {
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-group h2 {
    font-size: 1.375rem;
  }

  .page-faq .faq-item summary {
    font-size: 1.0625rem;
    padding: 16px 0;
  }
}

@media (max-width: 920px) {
  .page-faq .faq-tail {
    padding-bottom: 104px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__body {
    animation: none;
  }

  .page-faq .faq-tree__link,
  .page-faq .faq-item summary,
  .page-faq .faq-tree__link::before {
    transition: none;
  }
}