.page-faq {
  --faq-side-w: 216px;
  --faq-dot: 8px;
  background: var(--ink-900);
  color: var(--white);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-faq .faq-hero {
  position: relative;
  border-bottom: 1px solid var(--line);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 88px 88px;
  background-position: center top;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 14% 0%, rgba(55, 214, 255, .10), transparent 62%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
  padding-top: calc(var(--header-h) + 30px);
  padding-bottom: clamp(36px, 6vw, 64px);
}

.page-faq .faq-hero__lead .eyebrow {
  margin-top: 14px;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.95rem, 5.4vw, 3.35rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -.01em;
  margin: .34em 0 .5em;
  max-width: 17em;
}

.page-faq .faq-hero .lede {
  max-width: 62ch;
  color: var(--cool-300);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 诊断路径面板 */
.page-faq .faq-board {
  position: relative;
  padding: 20px clamp(16px, 3vw, 24px);
  border: 1px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(18, 24, 32, .96), rgba(10, 20, 33, .96));
  min-width: 0;
}

.page-faq .faq-board__slot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line-strong);
}

.page-faq .faq-board__ver {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--cool-400);
}

.page-faq .faq-board__steps {
  list-style: none;
  margin: 0;
  padding: 18px 0 0;
  display: grid;
  gap: 16px;
}

.page-faq .faq-board__steps li {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
}

.page-faq .faq-board__num {
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--lime);
  padding-top: 3px;
}

.page-faq .faq-board__steps strong {
  display: block;
  font-size: .94rem;
  margin-bottom: 4px;
}

.page-faq .faq-board__steps p {
  margin: 0;
  font-size: .82rem;
  line-height: 1.72;
  color: var(--cool-400);
}

.page-faq .faq-board__foot {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line-strong);
  font-size: .76rem;
  line-height: 1.7;
  color: var(--cool-400);
}

/* 流程图 */
.page-faq .faq-diagram {
  padding-top: clamp(28px, 5vw, 48px);
}

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

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

/* 主布局 */
.page-faq .faq-layout {
  display: grid;
  gap: 28px;
  padding-top: clamp(32px, 5vw, 56px);
}

/* 左侧分类 */
.page-faq .faq-side {
  min-width: 0;
}

.page-faq .faq-side__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--cool-400);
}

.page-faq .faq-side__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-side__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  background: var(--ink-850);
  color: var(--cool-300);
  font-size: .84rem;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .2s ease, color .2s ease, background .2s ease;
}

.page-faq .faq-side__link:hover,
.page-faq .faq-side__link:focus-visible {
  border-color: var(--lime);
  color: var(--white);
  background: rgba(184, 255, 61, .06);
  outline: none;
}

.page-faq .faq-side__no {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--lime);
}

.page-faq .faq-side__top {
  display: inline-block;
  margin-top: 14px;
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--cool-400);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-side__top:hover,
.page-faq .faq-side__top:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

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

.page-faq .faq-block {
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-faq .faq-block + .faq-block {
  margin-top: clamp(38px, 6vw, 66px);
}

.page-faq .faq-block__head {
  display: grid;
  gap: 9px;
  margin-bottom: 18px;
}

.page-faq .faq-block h2 {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  font-weight: 800;
  line-height: 1.2;
  margin: 0;
}

.page-faq .faq-block__intro {
  margin: 0;
  max-width: 64ch;
  font-size: .92rem;
  line-height: 1.82;
  color: var(--cool-400);
}

/* 折叠条目 */
.page-faq .faq-item {
  border: 1px solid var(--line);
  background: var(--ink-850);
  border-radius: var(--radius);
  transition: border-color .2s ease;
}

.page-faq .faq-item + .faq-item {
  margin-top: 10px;
}

.page-faq .faq-item[open] {
  border-color: var(--line-strong);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 18px;
  list-style: none;
  cursor: pointer;
  font-size: .95rem;
  font-weight: 700;
  line-height: 1.6;
  color: var(--white);
  transition: background .2s ease;
}

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

.page-faq .faq-item summary:hover {
  background: rgba(55, 214, 255, .05);
}

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

.page-faq .faq-item summary::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--lime);
  line-height: 1.5;
}

.page-faq .faq-item[open] summary::after {
  content: "–";
}

.page-faq .faq-item__dot {
  flex: 0 0 auto;
  width: var(--faq-dot);
  height: var(--faq-dot);
  margin-top: 8px;
  border-radius: 50%;
  background: var(--cool-400);
  transition: background .2s ease, box-shadow .2s ease;
}

.page-faq .faq-item[open] .faq-item__dot {
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(184, 255, 61, .14);
}

.page-faq .faq-item__body {
  padding: 0 18px 18px 38px;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--cool-300);
}

.page-faq .faq-item__body ol {
  margin: 0;
  padding-left: 1.15em;
}

.page-faq .faq-item__body li {
  margin: .52em 0;
}

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

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

/* 大屏检查清单 */
.page-faq .faq-screen__figure {
  margin: 22px 0 0;
}

.page-faq .faq-checklist__title {
  margin: 24px 0 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--cool-400);
}

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

.page-faq .faq-check {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 11px 13px;
  border: 1px dashed var(--line-strong);
  background: rgba(18, 24, 32, .62);
  cursor: pointer;
  transition: border-color .2s ease, background .2s ease;
}

.page-faq .faq-check:hover {
  border-color: var(--cool-400);
}

.page-faq .faq-check input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-faq .faq-check__box {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 16px;
  height: 16px;
  margin-top: 3px;
  border: 1px solid var(--cool-400);
  transition: border-color .2s ease, background .2s ease;
}

.page-faq .faq-check__box::after {
  content: "";
  width: 8px;
  height: 8px;
  background: transparent;
  transition: background .2s ease;
}

.page-faq .faq-check input:checked + .faq-check__box {
  border-color: var(--lime);
  background: rgba(184, 255, 61, .14);
}

.page-faq .faq-check input:checked + .faq-check__box::after {
  background: var(--lime);
}

.page-faq .faq-check input:focus-visible + .faq-check__box {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-faq .faq-check__text {
  font-size: .86rem;
  line-height: 1.7;
  color: var(--cool-300);
}

.page-faq .faq-check__key {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  color: var(--lime);
}

/* 联络准备 */
.page-faq .faq-prep {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-prep li {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  background: var(--ink-850);
  border-left: 2px solid var(--line-strong);
}

.page-faq .faq-prep__k {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--lime);
}

.page-faq .faq-prep__v {
  font-size: .88rem;
  line-height: 1.72;
  color: var(--cool-300);
}

.page-faq .faq-note {
  margin: 18px 0 0;
  padding: 13px 16px;
  border-left: 2px solid var(--orange);
  background: rgba(255, 122, 26, .08);
  font-size: .86rem;
  line-height: 1.78;
  color: var(--cool-300);
}

.page-faq .faq-contact-strip {
  margin-top: 22px;
  padding: 18px;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(90deg, rgba(184, 255, 61, .05), transparent 55%),
    var(--ink-800);
  display: grid;
  gap: 14px;
}

.page-faq .faq-contact-strip__line {
  margin: 0;
  font-size: .86rem;
  line-height: 1.85;
  color: var(--cool-300);
  word-break: break-word;
}

.page-faq .faq-contact-strip__mono {
  font-family: var(--font-mono);
  font-size: .84rem;
  color: var(--white);
}

.page-faq .faq-contact-strip__sep {
  margin: 0 6px;
  color: var(--cool-400);
}

.page-faq .faq-contact-strip .btn {
  justify-self: start;
}

.page-faq .faq-block__tail {
  margin: 18px 0 0;
  font-size: .85rem;
  line-height: 1.8;
  color: var(--cool-400);
}

/* 中等屏 */
@media (min-width: 720px) {
  .page-faq .faq-checklist {
    grid-template-columns: 1fr 1fr;
  }

  .page-faq .faq-prep li {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: baseline;
    gap: 14px;
    border-left-color: var(--lime);
  }

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

/* 桌面端：左侧分类吸顶 */
@media (min-width: 940px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.28fr) minmax(300px, .72fr);
    align-items: start;
    gap: 48px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-side-w) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-faq .faq-side {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

  .page-faq .faq-side__list {
    flex-direction: column;
    overflow: visible;
  }

  .page-faq .faq-side__link {
    white-space: normal;
    width: 100%;
  }

  .page-faq .faq-prep li {
    grid-template-columns: 112px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item summary,
  .page-faq .faq-item__dot,
  .page-faq .faq-side__link,
  .page-faq .faq-check,
  .page-faq .faq-check__box,
  .page-faq .faq-check__box::after {
    transition: none;
  }
}
<<<END>>>