.page-faq {
  --faq-gap: clamp(1rem, 2.2vw, 1.6rem);
  --faq-pad: clamp(1rem, 2.4vw, 1.75rem);
  --faq-line: 2px solid var(--hairline);
  display: block;
  padding-bottom: clamp(2.5rem, 6vw, 5rem);
}

.page-faq a:focus-visible,
.page-faq summary:focus-visible,
.page-faq input:focus-visible + .faq-check__label {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 首屏框景 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: var(--faq-gap);
  margin-top: clamp(0.75rem, 2vw, 1.25rem);
}

.page-faq .faq-hero__frame {
  position: relative;
  border: var(--faq-line);
  border-color: var(--ink-700);
  background:
    radial-gradient(120% 90% at 0% 0%, rgba(46, 217, 255, 0.12), transparent 62%),
    linear-gradient(160deg, var(--ink-800), var(--ink-900) 72%);
  box-shadow: var(--shadow-hard-lg);
  padding: calc(var(--faq-pad) + 0.7rem) var(--faq-pad) var(--faq-pad);
  overflow: hidden;
}

.page-faq .faq-hero__ticks {
  position: absolute;
  inset: 0 0 auto 0;
  height: 12px;
  background: repeating-linear-gradient(90deg, var(--ink-700) 0 1px, transparent 1px 14px);
  border-bottom: 1px solid var(--hairline);
  pointer-events: none;
}

.page-faq .faq-hero__title {
  margin: 0.45rem 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.85rem, 6.2vw, 3.8rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: var(--paper);
  max-width: 22ch;
}

.page-faq .faq-hero__lede {
  margin: 1rem 0 0;
  max-width: 58ch;
  font-family: var(--font-body);
  font-size: clamp(0.96rem, 1.5vw, 1.06rem);
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.4rem;
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0;
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0.9rem 0 0;
  border-top: 1px dashed var(--ink-700);
  font-size: 0.8rem;
  color: var(--muted);
}

.page-faq .faq-hero__meta li {
  padding-right: 0.9rem;
  margin-right: 0.9rem;
  border-right: 1px solid var(--hairline);
}

.page-faq .faq-hero__meta li:last-child {
  padding-right: 0;
  margin-right: 0;
  border-right: 0;
}

.page-faq .faq-hero__meta .mono {
  color: var(--green);
  font-weight: 600;
}

.page-faq .faq-hero__side {
  display: grid;
  gap: 0.7rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-faq .data-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  border: var(--faq-line);
  border-color: var(--ink-700);
  background: var(--ink-800);
  padding: 0.75rem 0.85rem;
}

.page-faq .data-card__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-faq .data-card__value {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .data-card--live .data-card__value {
  color: var(--green);
}

.page-faq .data-card--alert .data-card__value {
  color: var(--amber);
}

/* ---------- 双栏：左索引 + 右内容 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: var(--faq-gap);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-faq .faq-index {
  border: var(--faq-line);
  border-color: var(--ink-700);
  background: var(--ink-800);
  padding: 1rem;
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-index__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.3rem;
}

.page-faq .faq-index__link {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
  padding: 0.45rem 0.55rem;
  border-left: 3px solid transparent;
  text-decoration: none;
  color: var(--paper);
  font-size: 0.9rem;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-left-color: var(--green);
  background: rgba(57, 255, 136, 0.08);
}

.page-faq .faq-index__no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
}

.page-faq .faq-index__hint {
  margin: 0.9rem 0 0;
  padding-top: 0.7rem;
  border-top: 1px solid var(--hairline);
  font-size: 0.76rem;
  line-height: 1.7;
  color: var(--muted);
}

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

/* ---------- 区块头 ---------- */
.page-faq .faq-section + .faq-section {
  margin-top: clamp(2rem, 5vw, 3.25rem);
  padding-top: clamp(1.75rem, 4vw, 2.75rem);
  border-top: var(--faq-line);
  border-color: var(--ink-700);
}

.page-faq .faq-section__head {
  display: grid;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.page-faq .faq-section__no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .faq-section__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.3rem, 3.2vw, 1.95rem);
  line-height: 1.22;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-faq .faq-section__note {
  margin: 0;
  max-width: 60ch;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-section__intro {
  margin: 0 0 1.1rem;
  max-width: 62ch;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 四类问题 ---------- */
.page-faq .faq-quad {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-faq .faq-quad__item {
  position: relative;
  overflow: hidden;
  border: var(--faq-line);
  border-color: var(--ink-700);
  background: var(--ink-800);
  padding: 1rem 1rem 1rem 1.4rem;
  box-shadow: var(--shadow-hard);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-quad__item::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: var(--cyan);
}

.page-faq .faq-quad__item--cache::before {
  background: var(--amber);
}

.page-faq .faq-quad__item--tag::before {
  background: var(--violet);
}

.page-faq .faq-quad__item--nav::before {
  background: var(--green);
}

.page-faq .faq-quad__item:hover {
  transform: translateY(-2px);
  border-color: var(--ink-700);
  box-shadow: var(--shadow-hard-lg);
}

.page-faq .faq-quad__no {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-faq .faq-quad__name {
  margin: 0.35rem 0 0.4rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1rem;
  line-height: 1.45;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-quad__desc {
  margin: 0 0 0.75rem;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-quad__link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

.page-faq .faq-quad__link:hover {
  color: var(--green);
}

/* ---------- 图片框 ---------- */
.page-faq .faq-figure {
  margin: 0;
  border: var(--faq-line);
  border-color: var(--ink-700);
  background: var(--ink-800);
  padding: 0.6rem;
  box-shadow: var(--shadow-hard);
}

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

.page-faq .faq-figure__cap {
  padding: 0.65rem 0.2rem 0.1rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 折叠步骤卡 ---------- */
.page-faq .faq-steps {
  display: grid;
  gap: 0.7rem;
  margin: 0 0 1.25rem;
}

.page-faq .faq-step {
  border: var(--faq-line);
  border-color: var(--ink-700);
  background: var(--ink-800);
}

.page-faq .faq-step__sum {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.85rem 1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--paper);
  transition: background-color 0.2s ease;
}

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

.page-faq .faq-step__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-step[open] > .faq-step__sum::after {
  content: "−";
  color: var(--green);
}

.page-faq .faq-step[open] > .faq-step__sum {
  border-bottom: 2px solid var(--ink-700);
  background: linear-gradient(90deg, rgba(57, 255, 136, 0.09), transparent 72%);
}

.page-faq .faq-step__no {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--green);
  white-space: nowrap;
}

.page-faq .faq-step__body {
  padding: 1rem;
}

.page-faq .faq-step__grid {
  margin: 0;
  display: grid;
  gap: 0.9rem;
}

.page-faq .faq-step__cell {
  min-width: 0;
  border-left: 2px solid var(--ink-700);
  padding-left: 0.75rem;
}

.page-faq .faq-step__cell--judge {
  border-left-color: var(--orange);
}

.page-faq .faq-step__cell dt {
  margin-bottom: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-faq .faq-step__cell dd {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-step__cell--judge dd {
  color: var(--paper);
}

/* ---------- 命令块 ---------- */
.page-faq .faq-cmd {
  border: var(--faq-line);
  border-color: var(--ink-700);
  border-left: 5px solid var(--cyan);
  background: var(--ink-900);
  padding: 1rem;
}

.page-faq .faq-cmd__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .faq-cmd__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-cmd__list li::before {
  content: "› ";
  color: var(--green);
  font-family: var(--font-mono);
}

.page-faq .faq-cmd__list .mono {
  color: var(--amber);
  font-size: 0.82rem;
}

/* ---------- 标签三项字段 ---------- */
.page-faq .faq-fields {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-faq .faq-fields__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  border: var(--faq-line);
  border-color: var(--ink-700);
  background: var(--ink-800);
  padding: 0.9rem 1rem;
}

.page-faq .faq-fields__no {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--violet);
  padding-top: 0.15rem;
}

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

.page-faq .faq-fields__name {
  margin: 0 0 0.35rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 0.98rem;
  line-height: 1.5;
  color: var(--paper);
}

.page-faq .faq-fields__desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-fields__desc a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-faq .faq-fields__desc a:hover {
  color: var(--green);
}

/* ---------- 导航状态 ---------- */
.page-faq .faq-state {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-faq .faq-state__item {
  display: grid;
  gap: 0.45rem;
  align-content: start;
  border: var(--faq-line);
  border-color: var(--ink-700);
  background: var(--ink-800);
  padding: 0.9rem 1rem;
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-state__item .tag {
  justify-self: start;
}

.page-faq .faq-state__name {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 0.98rem;
  color: var(--paper);
}

.page-faq .faq-state__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-inline-note {
  margin: 0;
  border-left: 4px solid var(--amber);
  background: rgba(255, 209, 102, 0.08);
  padding: 0.7rem 0.9rem;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--paper);
}

.page-faq .faq-inline-note a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-faq .faq-inline-note a:hover {
  color: var(--cyan);
}

/* ---------- 换设备清单 ---------- */
.page-faq .faq-device {
  display: grid;
  gap: var(--faq-gap);
  align-items: start;
}

.page-faq .faq-check {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-faq .faq-check__item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  border: var(--faq-line);
  border-color: var(--ink-700);
  background: var(--ink-800);
  padding: 0.8rem 0.9rem;
  transition: border-color 0.22s ease, background-color 0.22s ease;
}

.page-faq .faq-check__box {
  flex: 0 0 auto;
  width: 1.15rem;
  height: 1.15rem;
  margin: 0.25rem 0 0;
  accent-color: var(--green);
  cursor: pointer;
}

.page-faq .faq-check__label {
  display: flex;
  gap: 0.6rem;
  min-width: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--muted);
  cursor: pointer;
}

.page-faq .faq-check__label b {
  color: var(--paper);
  font-weight: 700;
}

.page-faq .faq-check__no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--cyan);
  padding-top: 0.15rem;
}

.page-faq .faq-check__box:checked ~ .faq-check__label {
  color: var(--paper);
}

.page-faq .faq-check__box:checked ~ .faq-check__label .faq-check__no {
  color: var(--green);
}

.page-faq .faq-check__item:has(.faq-check__box:checked) {
  border-color: var(--green);
  background: linear-gradient(90deg, rgba(57, 255, 136, 0.1), var(--ink-800) 70%);
}

/* ---------- 提交反馈 ---------- */
.page-faq .faq-submit {
  display: grid;
  gap: var(--faq-gap);
}

.page-faq .faq-template {
  border: var(--faq-line);
  border-color: var(--ink-700);
  border-left: 5px solid var(--amber);
  background: var(--ink-900);
  padding: 1rem 1rem 1rem 1.1rem;
}

.page-faq .faq-template__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-faq .faq-template__list {
  margin: 0.75rem 0 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.5rem;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--paper);
}

.page-faq .faq-template__list li::marker {
  font-family: var(--font-mono);
  color: var(--amber);
}

.page-faq .faq-contact {
  display: grid;
  gap: 0.8rem;
  align-content: start;
  border: var(--faq-line);
  border-color: var(--ink-700);
  background: var(--ink-800);
  padding: 1rem;
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-contact__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1rem;
  color: var(--paper);
}

.page-faq .faq-contact__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-faq .faq-contact__row {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr);
  gap: 0.6rem;
  align-items: baseline;
}

.page-faq .faq-contact__key {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-faq .faq-contact__val {
  font-size: 0.88rem;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-faq .faq-contact__val.mono {
  font-size: 0.84rem;
  color: var(--green);
}

.page-faq .faq-contact__note {
  margin: 0;
  padding-top: 0.75rem;
  border-top: 1px solid var(--hairline);
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-contact__cta {
  justify-self: start;
}

/* ---------- 断点 ---------- */
@media (min-width: 40rem) {
  .page-faq .faq-quad {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-faq .faq-step__grid--duo {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 56rem) {
  .page-faq .faq-device {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
  }

  .page-faq .faq-submit {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

@media (min-width: 62rem) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1fr) minmax(220px, 280px);
    align-items: start;
  }

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

  .page-faq .faq-layout {
    grid-template-columns: minmax(200px, 250px) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 5.5rem;
  }

  .page-faq .faq-section__head {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    column-gap: 1.75rem;
    align-items: end;
  }

  .page-faq .faq-section__no {
    grid-column: 1 / -1;
  }

  .page-faq .faq-section__title {
    grid-column: 1;
  }

  .page-faq .faq-section__note {
    grid-column: 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-quad__item,
  .page-faq .faq-index__link,
  .page-faq .faq-step__sum,
  .page-faq .faq-check__item {
    transition: none;
  }

  .page-faq .faq-quad__item:hover {
    transform: none;
  }
}