.page-faq {
  --faq-step-bg: #16261F;
  --faq-code-a: var(--lime);
  --faq-code-b: var(--flame);
  --faq-code-c: var(--cyan);
  padding-bottom: 0;
}

/* 面包屑 */
.page-faq__crumb {
  padding-top: 18px;
  padding-bottom: 4px;
}

/* 首屏 */
.page-faq__hero {
  position: relative;
  padding: clamp(26px, 4.5vw, 48px) 0 clamp(34px, 5.5vw, 64px);
  overflow: hidden;
}

.page-faq__hero::before {
  content: "";
  position: absolute;
  inset: -18% -8% auto auto;
  width: min(64vw, 660px);
  height: min(64vw, 660px);
  background:
    radial-gradient(circle at 30% 30%, rgba(198, 255, 61, 0.16), rgba(198, 255, 61, 0) 62%),
    radial-gradient(circle at 70% 72%, rgba(255, 90, 43, 0.13), rgba(255, 90, 43, 0) 58%);
  clip-path: polygon(14% 0, 100% 8%, 86% 100%, 0 84%);
  pointer-events: none;
  z-index: 0;
}

.page-faq__hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}

@media (min-width: 900px) {
  .page-faq__hero-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    column-gap: clamp(32px, 4vw, 60px);
  }
}

.page-faq__hero-copy h1 {
  margin: 10px 0 0;
}

.page-faq__lead {
  margin: 20px 0 0;
  max-width: 36em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}

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

/* 首屏路线 */
.page-faq__hero-side {
  display: grid;
  gap: 16px;
  align-content: start;
  padding: 22px 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, var(--panel), var(--elevated));
  clip-path: polygon(0 0, 100% 3%, 96% 100%, 0 96%);
}

.page-faq__side-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lime);
  text-transform: uppercase;
}

.page-faq__route {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-faq__route-step {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 7px 0;
}

.page-faq__route-step::after {
  content: "";
  position: absolute;
  left: 23px;
  top: 52px;
  bottom: -6px;
  width: 2px;
  background: linear-gradient(180deg, rgba(198, 255, 61, 0.7), rgba(198, 255, 61, 0));
}

.page-faq__route-step:last-child::after {
  display: none;
}

.page-faq__route-dot {
  flex: none;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: rgba(11, 20, 18, 0.7);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.page-faq__route-name {
  font-size: 15px;
  color: var(--text);
}

.page-faq__side-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* 布局：正文 + 侧导轨 */
.page-faq__layout {
  padding-bottom: clamp(56px, 8vw, 96px);
  display: grid;
  gap: 0;
}

.page-faq__rail {
  display: none;
}

@media (min-width: 1040px) {
  .page-faq__layout {
    grid-template-columns: 148px minmax(0, 1fr);
    column-gap: clamp(40px, 4.5vw, 64px);
  }

  .page-faq__rail {
    display: grid;
    gap: 6px;
    align-content: start;
    position: sticky;
    top: 116px;
    padding-top: 12px;
  }
}

.page-faq__rail-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 10px 7px 12px;
  border-left: 2px solid var(--line);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  text-decoration: none;
  color: var(--muted);
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-faq__rail-link:hover,
.page-faq__rail-link:focus-visible {
  color: var(--text);
  border-left-color: var(--lime);
  background: rgba(198, 255, 61, 0.07);
}

.page-faq__rail-link.is-active,
.page-faq__rail-link[aria-current="true"] {
  color: var(--lime);
  border-left-color: var(--lime);
  background: rgba(198, 255, 61, 0.1);
}

.page-faq__rail-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-faq__rail-label {
  font-size: 13px;
}

/* 章节 */
.page-faq__section {
  position: relative;
  padding: clamp(38px, 5.5vw, 64px) 0;
  border-top: 1px solid var(--line);
}

.page-faq__section:first-child {
  border-top: 0;
  padding-top: 8px;
}

.page-faq__section--last {
  padding-bottom: 0;
}

.page-faq__section .section-head {
  display: grid;
  gap: 6px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-faq__section .section-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--flame);
}

.page-faq__section .section-title {
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq__section .section-kicker {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-faq__body {
  margin: 0 0 18px;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

/* 图片 */
.page-faq__figure {
  margin: 0 0 clamp(22px, 3.5vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--panel);
}

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

.page-faq__figure--narrow {
  max-width: 780px;
  margin-top: clamp(22px, 3.5vw, 34px);
}

/* 手风琴步骤 */
.page-faq__steps {
  display: grid;
  gap: 12px;
  counter-reset: faq-step;
}

.page-faq__step {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel);
  overflow: hidden;
  transition: border-color 0.26s var(--ease), transform 0.26s var(--ease);
}

.page-faq__step + .page-faq__step {
  margin-left: clamp(0px, 3vw, 40px);
}

.page-faq__step[open] {
  border-color: rgba(198, 255, 61, 0.42);
  box-shadow: 0 0 0 1px rgba(198, 255, 61, 0.08) inset;
}

.page-faq__step-head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-faq__step-head::-webkit-details-marker {
  display: none;
}

.page-faq__step-head:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-faq__step-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--lime);
  line-height: 1;
}

.page-faq__step-title {
  flex: 1 1 auto;
  font-size: clamp(15px, 1.6vw, 18px);
  font-weight: 600;
  color: var(--text);
}

.page-faq__step-sign {
  flex: none;
  position: relative;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--line);
  transition: border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-faq__step-sign::before,
.page-faq__step-sign::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  translate: -50% -50%;
  background: var(--lime);
  border-radius: 1px;
}

.page-faq__step-sign::before {
  width: 12px;
  height: 2px;
}

.page-faq__step-sign::after {
  width: 2px;
  height: 12px;
  transition: opacity 0.24s var(--ease);
}

.page-faq__step[open] .page-faq__step-sign {
  background: rgba(198, 255, 61, 0.14);
  border-color: var(--lime);
}

.page-faq__step[open] .page-faq__step-sign::after {
  opacity: 0;
}

.page-faq__step-body {
  margin: 0;
  padding: 0 18px 18px calc(18px + clamp(20px, 3vw, 30px) + 14px);
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

@media (max-width: 640px) {
  .page-faq__step-body {
    padding-left: 18px;
  }
}

/* 编号示例 */
.page-faq__code-card {
  display: grid;
  gap: 10px;
  padding: clamp(18px, 3vw, 28px);
  margin-bottom: 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(135deg, var(--panel), var(--faq-step-bg));
  clip-path: polygon(0 5%, 100% 0, 98.5% 96%, 1% 100%);
}

.page-faq__code-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-faq__code {
  margin: 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
  font-family: var(--font-mono);
  font-size: clamp(28px, 6vw, 56px);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.1;
}

.page-faq__code-seg {
  padding: 0 6px;
  border-radius: 4px;
}

.page-faq__code-seg--a {
  color: var(--faq-code-a);
  background: rgba(198, 255, 61, 0.1);
}

.page-faq__code-seg--b {
  color: var(--faq-code-b);
  background: rgba(255, 90, 43, 0.1);
}

.page-faq__code-seg--c {
  color: var(--faq-code-c);
  background: rgba(63, 210, 199, 0.1);
}

.page-faq__code-dash {
  color: var(--line);
}

.page-faq__code-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

@media (min-width: 760px) {
  .page-faq__code-legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-faq__code-item {
  padding: 16px 16px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: rgba(18, 33, 29, 0.6);
}

.page-faq__code-key {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 9px;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
}

.page-faq__code-key--a {
  color: var(--ink);
  background: var(--lime);
}

.page-faq__code-key--b {
  color: var(--ink);
  background: var(--flame);
}

.page-faq__code-key--c {
  color: var(--ink);
  background: var(--cyan);
}

.page-faq__code-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* 设备选择 */
.page-faq__device {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

@media (min-width: 820px) {
  .page-faq__device {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-faq__device-item:nth-child(2) {
    translate: 0 22px;
  }
}

.page-faq__device-item {
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel);
  transition: transform 0.26s var(--ease), border-color 0.26s var(--ease);
}

.page-faq__device-item:hover {
  border-color: rgba(63, 210, 199, 0.5);
}

.page-faq__device-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-faq__device-title {
  margin: 0 0 8px;
  font-size: 16.5px;
  line-height: 1.4;
  color: var(--text);
}

.page-faq__device-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* 排查项 */
.page-faq__trouble {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

@media (min-width: 820px) {
  .page-faq__trouble {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-faq__trouble-item {
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(18, 33, 29, 0.9), rgba(11, 20, 18, 0.9));
}

.page-faq__trouble-icon {
  display: block;
  width: 30px;
  height: 30px;
  margin-bottom: 12px;
  border-radius: var(--r-sm);
}

.page-faq__trouble-icon--a {
  background: var(--lime);
  clip-path: polygon(0 12%, 100% 0, 100% 88%, 0 100%);
}

.page-faq__trouble-icon--b {
  background: var(--flame);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.page-faq__trouble-icon--c {
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 14%, 82% 100%, 0 86%);
}

.page-faq__trouble-title {
  margin: 0 0 8px;
  font-size: 16.5px;
  line-height: 1.4;
  color: var(--text);
}

.page-faq__trouble-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* 订阅 */
.page-faq__sub {
  display: grid;
  gap: 14px;
}

@media (min-width: 820px) {
  .page-faq__sub {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-faq__sub-card {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 22px 20px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel);
}

.page-faq__sub-card .chip {
  justify-self: start;
}

.page-faq__sub-title {
  margin: 0;
  font-size: 18px;
  line-height: 1.35;
  color: var(--text);
}

.page-faq__sub-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq__sub-link {
  justify-self: start;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px dashed rgba(198, 255, 61, 0.5);
  padding-bottom: 2px;
}

.page-faq__sub-link:hover,
.page-faq__sub-link:focus-visible {
  color: var(--text);
  border-bottom-color: var(--text);
}

/* 联系收束 */
.page-faq__contact {
  display: grid;
  gap: 20px;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(140deg, var(--elevated), var(--panel));
  clip-path: polygon(0 6%, 100% 0, 97% 100%, 0 94%);
}

@media (min-width: 820px) {
  .page-faq__contact {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 32px;
  }
}

.page-faq__contact-text .page-faq__body {
  margin-bottom: 12px;
}

.page-faq__contact-text .page-faq__body:last-child {
  margin-bottom: 0;
}

.page-faq__contact .btn {
  justify-self: start;
}

@media (min-width: 820px) {
  .page-faq__contact .btn {
    justify-self: end;
  }
}
<<<END>>>