.page-faq {
  --faq-pad: clamp(16px, 4vw, 56px);
  background: var(--by-ink);
  color: var(--by-paper);
  overflow-x: hidden;
}

.page-faq .faq-crumbs {
  padding-top: clamp(18px, 3vw, 28px);
}

.page-faq .by-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--by-mist);
}

.page-faq .by-crumbs li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-faq .by-crumbs li + li::before {
  content: "/";
  color: var(--by-hair-strong);
}

.page-faq .by-crumbs a {
  color: var(--by-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--by-ease), border-color 0.2s var(--by-ease);
}

.page-faq .by-crumbs a:hover {
  color: var(--by-lime);
  border-bottom-color: var(--by-lime);
}

/* 首屏 */
.page-faq .faq-hero {
  padding-block: clamp(24px, 4vw, 52px) clamp(30px, 5vw, 60px);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

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

.page-faq .faq-hero__text .by-eyebrow {
  margin: 0 0 16px;
}

.page-faq h1.by-title {
  margin: 0 0 18px;
  font-size: clamp(32px, 6vw, 68px);
  line-height: 1.04;
}

.page-faq .faq-hero__text .by-lead {
  max-width: 48ch;
  margin: 0;
  color: var(--by-pale);
  font-size: 16px;
  line-height: 1.8;
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-jump a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  border: 1px solid var(--by-hair-strong);
  color: var(--by-pale);
  text-decoration: none;
  font-family: var(--by-font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  transition: border-color 0.2s var(--by-ease), color 0.2s var(--by-ease),
    background 0.2s var(--by-ease);
}

.page-faq .faq-jump a::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--by-lime);
}

.page-faq .faq-jump a:hover {
  border-color: var(--by-lime);
  color: var(--by-lime);
  background: var(--by-veil);
}

.page-faq .faq-hero__figure {
  margin: 0;
  min-width: 0;
}

.page-faq .faq-hero__figure .by-media {
  border: 1px solid var(--by-hair-strong);
}

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

.page-faq .faq-hero__figure .by-figure__cap,
.page-faq .faq-aside .by-figure__cap {
  margin-top: 10px;
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--by-mist);
}

/* 三类分流 */
.page-faq .faq-tree {
  border-top: 1px solid var(--by-hair);
  border-bottom: 1px solid var(--by-hair);
  background: var(--by-ink-2);
  padding-block: clamp(34px, 5vw, 64px);
}

.page-faq .faq-tree__head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-faq .faq-tree__head .by-title {
  margin: 0;
  font-size: clamp(24px, 3.2vw, 38px);
}

.page-faq .faq-tree__branches {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--by-hair);
  border: 1px solid var(--by-hair);
}

.page-faq .faq-branch {
  background: var(--by-ink-2);
  padding: 22px 20px 24px;
  min-width: 0;
  transition: background 0.2s var(--by-ease);
}

.page-faq .faq-branch:hover {
  background: linear-gradient(0deg, var(--by-veil), var(--by-veil)), var(--by-ink-2);
}

.page-faq .faq-branch__idx {
  margin: 0 0 10px;
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--by-lime);
}

.page-faq .faq-branch__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.page-faq .faq-branch__desc {
  margin: 0 0 18px;
  color: var(--by-mist);
  font-size: 14px;
  line-height: 1.7;
}

.page-faq .faq-branch__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 0 18px;
}

.page-faq .faq-branch__list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--by-hair-lime);
}

.page-faq .faq-branch__list li {
  position: relative;
  margin-bottom: 10px;
}

.page-faq .faq-branch__list li:last-child {
  margin-bottom: 0;
}

.page-faq .faq-branch__list li::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 10px;
  width: 10px;
  height: 1px;
  background: var(--by-hair-lime);
}

.page-faq .faq-branch__list a {
  color: var(--by-pale);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.6;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--by-ease), border-color 0.2s var(--by-ease);
}

.page-faq .faq-branch__list a:hover {
  color: var(--by-lime);
  border-bottom-color: var(--by-lime);
}

/* 正文两栏 */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  padding-block: clamp(32px, 5vw, 72px);
}

.page-faq .faq-rail {
  border: 1px solid var(--by-hair);
  background: var(--by-ink-3);
  padding: 18px 16px;
}

.page-faq .faq-rail__title {
  margin: 0 0 14px;
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--by-mist);
}

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

.page-faq .faq-rail__list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--by-hair-lime);
}

.page-faq .faq-rail__list li {
  position: relative;
  margin-bottom: 12px;
}

.page-faq .faq-rail__list li::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 9px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--by-lime);
  background: var(--by-ink-3);
}

.page-faq .faq-rail__list a {
  color: var(--by-pale);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--by-ease), border-color 0.2s var(--by-ease);
}

.page-faq .faq-rail__list a:hover {
  color: var(--by-lime);
  border-bottom-color: var(--by-lime);
}

.page-faq .faq-rail__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--by-hair);
  font-size: 12px;
  line-height: 1.7;
  color: var(--by-mist);
}

.page-faq .faq-main {
  min-width: 0;
  display: grid;
  gap: clamp(36px, 5vw, 68px);
}

/* 章节 */
.page-faq .faq-chapter {
  scroll-margin-top: 96px;
  min-width: 0;
}

.page-faq .faq-chapter .by-band {
  background: transparent;
  border-top: 1px solid var(--by-hair-strong);
  padding: 14px 0 0;
  margin: 0 0 18px;
}

.page-faq .faq-chapter .by-band__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
}

.page-faq .faq-chapter .by-band__index {
  margin: 0;
  font-family: var(--by-font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--by-lime);
}

.page-faq .faq-chapter .by-band__title {
  flex: 1 1 300px;
  margin: 0;
  font-size: clamp(21px, 2.8vw, 30px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: 0.01em;
}

.page-faq .faq-chapter .by-band__meta {
  margin: 0;
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--by-mist);
}

.page-faq .faq-chapter__intro {
  margin: 0 0 20px;
  max-width: 62ch;
  color: var(--by-pale);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-faq .faq-chapter__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

/* 折叠问答 */
.page-faq .faq-acc {
  display: grid;
  gap: 1px;
  background: var(--by-hair);
  border: 1px solid var(--by-hair);
  min-width: 0;
}

.page-faq .faq-acc__item {
  background: var(--by-ink-2);
  border-left: 2px solid transparent;
  transition: border-color 0.2s var(--by-ease), background 0.2s var(--by-ease);
}

.page-faq .faq-acc__item:hover {
  border-left-color: var(--by-hair-lime);
}

.page-faq .faq-acc__item[data-open] {
  border-left-color: var(--by-lime);
  background: linear-gradient(0deg, var(--by-veil), var(--by-veil)), var(--by-ink-2);
}

.page-faq .faq-acc__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 20px;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 15px 16px;
  background: none;
  border: 0;
  color: var(--by-paper);
  font-family: var(--by-font-sans);
  font-size: 15px;
  line-height: 1.55;
  text-align: left;
  cursor: pointer;
  transition: color 0.2s var(--by-ease);
}

.page-faq .faq-acc__head:hover {
  color: var(--by-lime);
}

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

.page-faq .faq-acc__num {
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--by-lime);
}

.page-faq .faq-acc__sign {
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border: 1px solid var(--by-hair-strong);
  color: var(--by-lime);
  font-family: var(--by-font-mono);
  font-size: 13px;
  line-height: 1;
}

.page-faq .faq-acc__sign::before {
  content: "+";
}

.page-faq .faq-acc__item[data-open] .faq-acc__sign::before,
.page-faq .faq-acc__head[aria-expanded="true"] .faq-acc__sign::before {
  content: "\2212";
}

.page-faq .faq-acc__body {
  padding: 0 16px 18px;
}

.page-faq .faq-acc__body p {
  margin: 0 0 10px;
  color: var(--by-pale);
  font-size: 14.5px;
  line-height: 1.85;
}

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

.page-faq .faq-acc__body a {
  color: var(--by-lime);
  text-decoration: none;
  border-bottom: 1px solid var(--by-hair-lime);
}

.page-faq .faq-acc__body a:hover {
  border-bottom-color: var(--by-lime);
}

.page-faq .faq-path {
  counter-reset: faqstep;
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .faq-path li {
  position: relative;
  padding-left: 28px;
  color: var(--by-pale);
  font-size: 14px;
  line-height: 1.75;
}

.page-faq .faq-path li::before {
  counter-increment: faqstep;
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--by-lime);
}

/* 图片侧栏 */
.page-faq .faq-aside {
  margin: 0;
  min-width: 0;
}

.page-faq .faq-aside .by-media {
  border: 1px solid var(--by-hair-strong);
}

/* 步骤技能树 */
.page-faq .faq-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-faq .faq-steps li {
  position: relative;
  padding: 0 0 20px 30px;
}

.page-faq .faq-steps li::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 15px;
  bottom: 0;
  width: 1px;
  background: var(--by-hair-lime);
}

.page-faq .faq-steps li::after {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--by-lime);
  background: var(--by-ink);
}

.page-faq .faq-steps li.is-active::after {
  background: var(--by-lime);
}

.page-faq .faq-steps li:last-child {
  padding-bottom: 0;
}

.page-faq .faq-steps li:last-child::before {
  display: none;
}

.page-faq .faq-steps__num {
  display: block;
  margin-bottom: 3px;
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--by-lime);
}

.page-faq .faq-steps__title {
  display: block;
  margin-bottom: 3px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.page-faq .faq-steps__text {
  display: block;
  color: var(--by-mist);
  font-size: 14px;
  line-height: 1.75;
}

/* 冷白数据条 */
.page-faq .faq-spec {
  margin: 0 0 22px;
  padding: 18px 18px 8px;
  background: var(--by-paper);
  color: var(--by-ink);
  border: 1px solid var(--by-line);
  border-left: 4px solid var(--by-lime);
}

.page-faq .faq-spec__title {
  margin: 0 0 10px;
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--by-ink);
  opacity: 0.62;
}

.page-faq .faq-spec__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(2, 9, 6, 0.14);
}

.page-faq .faq-spec__row:last-child {
  border-bottom: 0;
}

.page-faq .faq-spec__key {
  font-size: 13px;
  line-height: 1.6;
  color: var(--by-ink);
  opacity: 0.74;
}

.page-faq .faq-spec__val {
  font-family: var(--by-font-mono);
  font-weight: 700;
  font-size: 13.5px;
  color: var(--by-ink);
  text-align: right;
}

/* 人工咨询 */
.page-faq .faq-contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--by-hair-strong);
  background: var(--by-ink-2);
}

.page-faq .faq-contact .faq-chapter__intro {
  margin-bottom: 14px;
}

.page-faq .faq-contact__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-contact__list li {
  position: relative;
  padding-left: 18px;
  color: var(--by-pale);
  font-size: 14px;
  line-height: 1.7;
}

.page-faq .faq-contact__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 1px;
  background: var(--by-lime);
}

.page-faq .faq-contact__box {
  padding: 16px;
  border: 1px solid var(--by-hair);
  background: var(--by-ink-3);
}

.page-faq .faq-contact__box .faq-spec__title {
  color: var(--by-mist);
  opacity: 1;
}

.page-faq .faq-contact__meta {
  font-family: var(--by-font-mono);
  font-size: 13px;
  color: var(--by-lime);
  word-break: break-all;
}

.page-faq .faq-next {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-faq .faq-next .by-btn {
  font-size: 14px;
}

/* 响应式 */
@media (min-width: 640px) {
  .page-faq .faq-spec {
    padding: 20px 22px 10px;
  }

  .page-faq .faq-acc__head {
    padding: 17px 20px;
    font-size: 15.5px;
  }

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

  .page-faq .faq-steps li {
    padding-left: 34px;
  }
}

@media (min-width: 760px) {
  .page-faq .faq-tree__branches {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-contact {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
    gap: clamp(32px, 4vw, 64px);
  }

  .page-faq .faq-hero__figure {
    margin-bottom: 6px;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-body {
    grid-template-columns: 236px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 92px;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-chapter__split {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    align-items: start;
    gap: 28px;
  }

  .page-faq .faq-aside {
    position: sticky;
    top: 92px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition: none !important;
    animation: none !important;
  }
}
<<<END>>>