.page-faq {
  background: var(--canvas);
  color: var(--graphite);
  font-family: var(--font-sans);
}

/* ---------- 面包屑 ---------- */
.page-faq .crumb {
  padding: 18px 0 0;
}
.page-faq .crumb__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: var(--fs-small);
}
.page-faq .crumb__item + .crumb__item::before {
  content: "/";
  color: var(--line);
  margin-right: 6px;
}
.page-faq .crumb__link {
  color: rgba(14, 21, 18, 0.72);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
  transition: color var(--ease), border-color var(--ease);
}
.page-faq .crumb__link:hover {
  color: var(--ink);
  border-color: var(--flash);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 28px 0 46px;
  overflow: hidden;
}
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--ink);
  transform: rotate(-0.6deg);
  transform-origin: left center;
  opacity: 0.85;
}
.page-faq .faq-hero__inner {
  display: grid;
  gap: 30px;
  align-items: end;
}
.page-faq .faq-hero__title {
  margin: 12px 0 14px;
  font-size: var(--fs-display);
  line-height: 1.06;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 34ch;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: rgba(14, 21, 18, 0.78);
}
.page-faq .faq-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  background: var(--ink);
  color: var(--on-dark);
  padding: 22px 18px;
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
  box-shadow: var(--shadow-2);
}
.page-faq .fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 0 12px;
  border-left: 1px solid var(--line-dark);
}
.page-faq .fact:first-child {
  border-left: 0;
  padding-left: 0;
}
.page-faq .fact__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--flash);
  line-height: 1.1;
}
.page-faq .fact__label {
  font-size: var(--fs-micro);
  color: var(--on-dark-dim);
  line-height: 1.5;
}

/* ---------- 三步上手 ---------- */
.page-faq .faq-flow {
  background: var(--canvas);
}
.page-faq .faq-flow__inner {
  display: grid;
  gap: 34px;
}
.page-faq .section-head__title {
  font-size: var(--fs-h2);
  font-weight: 800;
  color: var(--ink);
  margin: 0 0 8px;
}
.page-faq .section-head__note {
  margin: 0;
  max-width: 42ch;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: rgba(14, 21, 18, 0.68);
}
.page-faq .step-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  counter-reset: step;
}
.page-faq .step {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line-soft);
}
.page-faq .step:last-child {
  border-bottom: 1px solid var(--line-soft);
}
.page-faq .step__no {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--flash);
  color: var(--ink);
  font-size: 16px;
  font-weight: 700;
  font-family: var(--font-mono);
}
.page-faq .step__title {
  margin: 2px 0 6px;
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--ink);
}
.page-faq .step__text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: rgba(14, 21, 18, 0.78);
  max-width: 46ch;
}
.page-faq .faq-flow__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}
.page-faq .faq-flow__figure {
  margin: 0;
}
.page-faq .figure__media {
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--canvas-2);
}
.page-faq .figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-faq .figure__cap {
  margin-top: 8px;
  font-size: var(--fs-micro);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: rgba(14, 21, 18, 0.6);
}

/* ---------- 主体：目录树 + 问答流 ---------- */
.page-faq .faq-body {
  background: var(--canvas);
}
.page-faq .faq-body__inner {
  display: grid;
  gap: 40px;
}
.page-faq .faq-tree__label {
  margin: 0 0 12px;
  color: var(--ink);
}
.page-faq .faq-tree__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line-soft);
}
.page-faq .faq-tree__link {
  position: relative;
  display: block;
  padding: 9px 0 9px 16px;
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  transition: color var(--ease);
}
.page-faq .faq-tree__link::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 50%;
  transform: translateY(-50%);
  width: 2px;
  height: 0;
  background: var(--flash);
  transition: height var(--ease-slow);
}
.page-faq .faq-tree__link:hover::before,
.page-faq .faq-tree__link:focus-visible::before {
  height: 100%;
}
.page-faq .faq-tree__item--start .faq-tree__link::before {
  height: 100%;
}
.page-faq .faq-tree__note {
  margin: 16px 0 12px;
  font-size: var(--fs-micro);
  line-height: 1.75;
  color: rgba(14, 21, 18, 0.62);
}
.page-faq .faq-tree__btn {
  display: inline-block;
}

.page-faq .faq-group {
  scroll-margin-top: 26px;
}
.page-faq .faq-group + .faq-group {
  margin-top: 46px;
}
.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--ink);
}
.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.08em;
  background: var(--flash);
  color: var(--ink);
  padding: 3px 7px;
  font-weight: 700;
}
.page-faq .faq-group__title {
  margin: 0;
  font-size: var(--fs-h2);
  font-weight: 800;
  color: var(--ink);
}
.page-faq .faq-group__note {
  margin: 12px 0 6px;
  max-width: 52ch;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: rgba(14, 21, 18, 0.66);
}
.page-faq .faq-group__figure {
  margin: 24px 0 0;
}

/* 折叠问答 */
.page-faq .qa {
  border-bottom: 1px solid var(--line-soft);
}
.page-faq .qa__q {
  display: grid;
  grid-template-columns: 52px 1fr 20px;
  gap: 12px;
  align-items: start;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}
.page-faq .qa__q::-webkit-details-marker {
  display: none;
}
.page-faq .qa__q::after {
  content: "";
  align-self: start;
  margin-top: 9px;
  width: 20px;
  height: 4px;
  background: var(--ink);
  transition: height var(--ease), background-color var(--ease);
}
.page-faq .qa[open] .qa__q::after {
  height: 20px;
  background: var(--flash);
}
.page-faq .qa__no {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  text-align: center;
  padding: 3px 4px;
  border: 1px solid var(--line);
  color: var(--ink);
  background: var(--canvas);
}
.page-faq .qa__text {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--graphite);
  transition: color var(--ease);
}
.page-faq .qa:hover .qa__text,
.page-faq .qa[open] .qa__text {
  color: var(--ink);
}
.page-faq .qa__a {
  padding: 0 0 20px;
}
.page-faq .qa__a p {
  margin: 0 0 10px;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: rgba(14, 21, 18, 0.8);
  max-width: 56ch;
}
.page-faq .qa__a p:last-child {
  margin-bottom: 0;
}
.page-faq .qa__a .key {
  display: inline;
  background: var(--flash-soft);
  color: var(--ink);
  font-weight: 700;
  padding: 1px 5px;
  box-decoration-break: clone;
}
.page-faq .qa__a a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--flash);
  text-underline-offset: 3px;
}

/* ---------- 底部求助 ---------- */
.page-faq .faq-help {
  background: var(--ink);
  color: var(--on-dark);
  padding-top: 46px;
  padding-bottom: 46px;
}
.page-faq .faq-help__inner {
  display: grid;
  gap: 22px;
}
.page-faq .faq-help__title {
  margin: 0 0 10px;
  font-size: var(--fs-h2);
  font-weight: 800;
  color: var(--canvas);
}
.page-faq .faq-help__lede {
  margin: 0;
  max-width: 48ch;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--on-dark);
}
.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-faq .faq-help .btn--ghost {
  color: var(--canvas);
  border-color: var(--line-dark);
}
.page-faq .faq-help .btn--ghost:hover {
  border-color: var(--flash);
  color: var(--flash);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-hero {
    padding: 36px 0 54px;
  }
  .page-faq .fact__num {
    font-size: 30px;
  }
  .page-faq .qa__a {
    padding-left: 64px;
  }
  .page-faq .faq-help__inner {
    grid-template-columns: 1.5fr auto;
    align-items: end;
    gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: 1.45fr 0.9fr;
    gap: 48px;
  }
  .page-faq .faq-flow__inner {
    grid-template-columns: 1.05fr 1fr;
    align-items: start;
    gap: 46px;
  }
  .page-faq .faq-flow__figure {
    margin-top: 6px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body__inner {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 52px;
  }
  .page-faq .faq-tree {
    position: sticky;
    top: 26px;
    align-self: start;
  }
  .page-faq .qa__a {
    padding-left: 84px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__q::after,
  .page-faq .faq-tree__link::before,
  .page-faq .qa__text {
    transition: none;
  }
}