.page-faq {
  --faq-rail: 118px;
  --faq-flow-gap: clamp(1rem, 2.5vw, 1.5rem);
  background: var(--ink-900);
  color: var(--text-light);
  overflow-x: clip;
}

.page-faq .section--paper {
  color: var(--ink-brown);
}

/* 面包屑 */
.page-faq .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 0 0 clamp(1.5rem, 4vw, 2.5rem);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-faq .crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

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

.page-faq .crumbs__sep {
  color: var(--line);
}

.page-faq .crumbs [aria-current="page"] {
  color: var(--gold-soft);
  border-bottom-color: transparent;
}

/* 首屏 */
.page-faq .faq-hero {
  padding-block: clamp(1.25rem, 4vw, 2.5rem) clamp(2.25rem, 6vw, 4rem);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-faq .eyebrow {
  margin: 0 0 .6rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-faq .faq-hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.95rem, 6vw, 3.9rem);
  line-height: 1.03;
  letter-spacing: .02em;
  color: var(--text-light);
  text-wrap: balance;
}

.page-faq .lede {
  max-width: 40rem;
  margin: 0;
  font-size: clamp(.95rem, 1.6vw, 1.05rem);
  line-height: 1.8;
  color: var(--text-light);
  opacity: .84;
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem 1.6rem;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: clamp(.85rem, 2vw, 1.1rem) 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .05em;
  color: var(--muted);
}

.page-faq .faq-hero__meta b {
  color: var(--gold-soft);
  font-weight: 600;
  margin-right: .4rem;
}

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

/* 章节标题组 */
.page-faq .faq-head {
  display: grid;
  gap: .55rem;
  margin: 0 0 clamp(1.5rem, 4vw, 2.5rem);
}

.page-faq .faq-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 3.6vw, 2.35rem);
  line-height: 1.12;
  letter-spacing: .015em;
}

.page-faq .faq-head .measure {
  margin: 0;
  font-size: .95rem;
  line-height: 1.8;
  opacity: .8;
}

/* 症状分流 */
.page-faq .faq-symptoms {
  background: var(--ink-700);
  padding-block: clamp(2rem, 5vw, 3.75rem);
}

.page-faq .sym-grid {
  position: relative;
  display: grid;
  gap: .9rem;
}

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

.page-faq .sym-card {
  position: relative;
  display: block;
  padding: clamp(1.05rem, 2.4vw, 1.4rem) clamp(1.15rem, 2.4vw, 1.6rem) 2.1rem;
  background: var(--ink-500);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  cursor: pointer;
  transition: background .18s var(--ease), border-color .18s var(--ease);
}

.page-faq .sym-card::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 3px;
  background: var(--cyan);
  transition: width .24s var(--ease);
}

.page-faq .sym-card:hover {
  background: var(--ink-700);
}

.page-faq .sym-card:hover::after,
.page-faq .sym-input:checked + .sym-card::after {
  width: 100%;
}

.page-faq .sym-input:checked + .sym-card {
  background: var(--ink-700);
  border-color: var(--gold);
}

.page-faq .sym-input:focus-visible + .sym-card,
.page-faq .sym-input:focus-visible + .sym-reset {
  outline: 2px solid var(--gold-soft);
  outline-offset: 3px;
}

.page-faq .sym-card__num {
  display: block;
  margin-bottom: .7rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-faq .sym-card__title {
  display: block;
  margin-bottom: .5rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.1rem, 2.4vw, 1.35rem);
  letter-spacing: .02em;
  color: var(--text-light);
}

.page-faq .sym-card__text {
  display: block;
  font-size: .875rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .sym-card__route {
  display: block;
  margin-top: .9rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-faq .sym-reset-wrap {
  position: relative;
  margin: 1.15rem 0 0;
}

.page-faq .sym-reset {
  display: inline-block;
  padding-bottom: .15rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--muted);
  border-bottom: 1px dashed var(--line);
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-faq .sym-input:checked + .sym-reset {
  color: var(--gold-soft);
  border-bottom-color: var(--gold);
}

/* 七步路径 */
.page-faq .faq-steps {
  padding-block: clamp(2.25rem, 7vw, 4.5rem);
}

.page-faq .steps-layout {
  display: grid;
  gap: 1.25rem;
}

.page-faq .step-track ol {
  display: flex;
  gap: .35rem;
  margin: 0;
  padding: 0 0 .35rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .track-link {
  display: flex;
  align-items: baseline;
  gap: .45rem;
  padding: .4rem .6rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .05em;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  border-left: 2px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-faq .track-link em {
  font-family: var(--font-body);
  font-style: normal;
  font-size: .72rem;
}

.page-faq .track-link:hover,
.page-faq .track-link[aria-current="true"] {
  color: var(--gold-soft);
  border-left-color: var(--gold);
}

.page-faq .track-link:hover span,
.page-faq .track-link[aria-current="true"] span {
  color: var(--gold);
}

.page-faq .step-flow {
  display: grid;
  gap: var(--faq-flow-gap);
}

.page-faq .step {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .35rem .85rem;
  padding: clamp(1rem, 2.4vw, 1.4rem) clamp(1rem, 2.4vw, 1.5rem) clamp(1.1rem, 2.6vw, 1.55rem);
  background: var(--paper);
  color: var(--ink-brown);
  border: 1px solid var(--line);
  border-left: 2px solid var(--gold);
  transition: border-color .18s var(--ease);
}

.page-faq .step + .step::before {
  content: "";
  position: absolute;
  left: 12px;
  top: calc(-1 * var(--faq-flow-gap));
  width: 1px;
  height: var(--faq-flow-gap);
  background: var(--gold);
  opacity: .55;
}

.page-faq .step:has(details[open]) {
  border-left-color: var(--cyan);
}

.page-faq .step__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  line-height: .95;
  letter-spacing: -.02em;
  color: var(--gold);
}

.page-faq .step__body {
  display: grid;
  gap: .65rem;
  min-width: 0;
}

.page-faq .step__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  letter-spacing: .03em;
  color: var(--ink-brown);
}

.page-faq .step__action,
.page-faq .step__stop {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
}

.page-faq .step__label {
  display: inline-block;
  margin-right: .45rem;
  padding: .08rem .38rem;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .12em;
  color: var(--ink-brown);
  border: 1px solid var(--gold);
  vertical-align: 2px;
}

.page-faq .step__stop {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .25rem .45rem;
  padding: .6rem .7rem;
  background: var(--paper-2);
  border-left: 2px solid var(--green);
}

.page-faq .step__stop .step__label {
  border-color: var(--green);
}

.page-faq .step .fold {
  margin-top: .1rem;
  background: var(--paper-2);
  border: 1px solid var(--line);
}

.page-faq .step .fold[open] {
  border-color: var(--cyan);
}

.page-faq .step .fold__summary {
  padding: .55rem .7rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .07em;
  color: var(--ink-brown);
  cursor: pointer;
}

.page-faq .step .fold__body {
  padding: .7rem;
  border-top: 1px solid var(--line);
  font-size: .875rem;
  line-height: 1.8;
}

.page-faq .step .fold__body p {
  margin: 0 0 .6rem;
}

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

.page-faq .step .fold__body a,
.page-faq .ec-do a {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-faq .step .fold__body a:hover,
.page-faq .ec-do a:hover {
  color: var(--ink-brown);
  text-decoration-color: var(--gold);
}

/* 按设备分组的问答 */
.page-faq .faq-devices {
  padding-block: clamp(2.25rem, 6vw, 4rem);
}

.page-faq .device-grid {
  display: grid;
  gap: 1rem;
}

.page-faq .device-panel {
  padding: 1.1rem .2rem 1.25rem;
  border-top: 2px solid var(--gold);
  border-bottom: 1px solid var(--line);
}

.page-faq .device-panel__os {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  color: var(--ink-brown);
  opacity: .6;
}

.page-faq .device-panel h3 {
  margin: .35rem 0 .85rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: .03em;
  color: var(--ink-brown);
}

.page-faq .device-panel .fold {
  border-top: 1px solid var(--line);
  border-bottom: 0;
}

.page-faq .device-panel .fold:last-child {
  border-bottom: 1px solid var(--line);
}

.page-faq .device-panel .fold__summary {
  padding: .6rem 0;
  font-size: .85rem;
  line-height: 1.6;
  color: var(--ink-brown);
  cursor: pointer;
}

.page-faq .device-panel .fold__body {
  padding: 0 0 .7rem;
  font-size: .85rem;
  line-height: 1.8;
}

.page-faq .device-panel .fold__body p {
  margin: 0;
}

/* 错误提示对照 */
.page-faq .faq-errors {
  padding-block: clamp(2.25rem, 6vw, 4rem);
}

.page-faq .errors-layout {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.25rem);
}

.page-faq .ec-list {
  min-width: 0;
}

.page-faq .ec-row {
  display: grid;
  gap: .5rem;
  padding: .85rem 1rem;
  background: var(--ink-500);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  transition: background .18s var(--ease), border-color .18s var(--ease);
}

.page-faq .ec-row + .ec-row {
  margin-top: .5rem;
}

.page-faq .ec-row:hover {
  background: var(--ink-700);
  border-left-color: var(--cyan);
}

.page-faq .ec-code {
  display: block;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-faq .ec-msg {
  display: block;
  margin-top: .2rem;
  font-size: .9rem;
  color: var(--text-light);
}

.page-faq .ec-cause {
  margin: 0;
  font-size: .76rem;
  letter-spacing: .03em;
  color: var(--muted);
}

.page-faq .ec-do {
  margin: .3rem 0 0;
  font-size: .86rem;
  line-height: 1.7;
  color: var(--cyan);
}

.page-faq .ec-note {
  margin: .5rem 0 0;
  padding-top: .5rem;
  border-top: 1px dashed var(--line);
  font-size: .78rem;
  line-height: 1.65;
  color: var(--muted);
  transition: color .18s var(--ease);
}

.page-faq .ec-row:hover .ec-note {
  color: var(--text-light);
}

.page-faq .errors-fig {
  margin: 0;
}

/* 转人工 */
.page-faq .faq-support {
  padding-block: clamp(2.25rem, 6vw, 4rem);
}

.page-faq .support-grid {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.75rem);
}

.page-faq .support-materials h3 {
  margin: 0 0 .9rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: .03em;
  color: var(--ink-brown);
}

.page-faq .support-materials ol {
  display: grid;
  gap: .6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .support-materials li {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  gap: .55rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--line);
  font-size: .9rem;
  line-height: 1.75;
}

.page-faq .sup-num {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-faq .support-materials__note {
  margin: .9rem 0 0;
  font-size: .85rem;
  line-height: 1.75;
  opacity: .75;
}

.page-faq .support-side__hours {
  margin: 0 0 1rem;
  font-size: .88rem;
  line-height: 1.8;
}

.page-faq .support-side__hours b {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--gold);
  margin-right: .5rem;
}

.page-faq .support-links {
  display: grid;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .support-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .7rem .85rem;
  font-size: .875rem;
  color: var(--ink-brown);
  text-decoration: none;
  border: 1px solid var(--line);
  transition: border-color .18s var(--ease), background .18s var(--ease);
}

.page-faq .support-links a::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--gold);
  transition: transform .18s var(--ease);
}

.page-faq .support-links a:hover {
  background: var(--paper-2);
  border-color: var(--gold);
}

.page-faq .support-links a:hover::after {
  transform: translateX(3px);
}

/* 症状筛选：仅在浏览器支持 :has 时生效，默认完整显示七步 */
.page-faq:has(#sym-open:checked) .step:not(.is-open),
.page-faq:has(#sym-login:checked) .step:not(.is-login),
.page-faq:has(#sym-layout:checked) .step:not(.is-layout) {
  display: none;
}

/* 断点 */
@media (min-width: 640px) {
  .page-faq .device-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem 1.75rem;
  }

  .page-faq .ec-row {
    grid-template-columns: minmax(0, 11rem) minmax(0, 1fr);
    gap: 1rem;
    align-items: start;
    padding: .9rem 1.1rem;
  }
}

@media (min-width: 860px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: end;
  }

  .page-faq .sym-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .support-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-faq .steps-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: clamp(1.5rem, 3vw, 2.5rem);
    align-items: start;
  }

  .page-faq .step-track {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }

  .page-faq .step-track ol {
    flex-direction: column;
    gap: .1rem;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-faq .track-link {
    padding: .5rem .6rem;
  }

  .page-faq .track-link span {
    font-size: 1.05rem;
    font-weight: 700;
  }

  .page-faq .track-link[aria-current="true"] span {
    font-size: 1.3rem;
  }
}

@media (min-width: 1120px) {
  .page-faq .device-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .errors-layout {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .85fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .sym-card,
  .page-faq .sym-card::after,
  .page-faq .track-link,
  .page-faq .ec-row,
  .page-faq .ec-note,
  .page-faq .support-links a,
  .page-faq .support-links a::after,
  .page-faq .crumbs a,
  .page-faq .step {
    transition: none;
  }
}
<<<END>>>