.page-faq {
  display: block;
  background: var(--c-navy);
  color: var(--c-text);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--c-navy);
  border-bottom: 1px solid var(--c-line);
  padding: clamp(2rem, 5vw, 3.25rem) 0 clamp(2.75rem, 6vw, 4.5rem);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(169, 180, 194, .09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(169, 180, 194, .09) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse at 15% 0%, #000 8%, transparent 74%);
  mask-image: radial-gradient(ellipse at 15% 0%, #000 8%, transparent 74%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -180px;
  right: -160px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 53, .32), transparent 68%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 860px;
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--c-signal);
}

.page-faq .faq-hero__title {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-size: var(--fs-display);
  line-height: 1.06;
  letter-spacing: -.03em;
  color: var(--c-paper);
}

.page-faq .faq-hero__lead {
  margin: 0 0 1.75rem;
  max-width: 62ch;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--c-text-dim);
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: .75rem;
  margin: 0 0 1.75rem;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__stat {
  border-left: 2px solid var(--c-signal);
  padding: .1rem 0 .1rem .85rem;
}

.page-faq .faq-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--c-paper);
  letter-spacing: -.01em;
}

.page-faq .faq-hero__cap {
  display: block;
  margin-top: .2rem;
  font-size: var(--fs-small);
  color: var(--c-text-dim);
}

/* ---------- 章节通用 ---------- */
.page-faq .section-head__title {
  margin: .35rem 0 .6rem;
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  line-height: 1.2;
  letter-spacing: -.02em;
}

.page-faq .section-head__desc {
  max-width: 66ch;
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.8;
}

.page-faq .section--paper .section-head__title,
.page-faq .section--sand .section-head__title {
  color: var(--c-ink);
}

.page-faq .section--paper .section-head__desc,
.page-faq .section--sand .section-head__desc {
  color: var(--c-ink-soft);
}

/* ---------- 问题信号索引 ---------- */
.page-faq .faq-index-section {
  background: var(--c-navy);
}

.page-faq .signal-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: .9rem;
  margin-top: 2rem;
}

.page-faq .signal-card {
  position: relative;
  display: block;
  padding: 1.25rem 1.25rem 1.35rem;
  background: var(--c-navy-2);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  text-decoration: none;
  color: var(--c-text);
  transition: transform .25s ease, border-color .25s ease, background .25s ease;
}

.page-faq .signal-card:hover,
.page-faq .signal-card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--c-signal);
  background: var(--c-navy-3);
}

.page-faq .signal-card__dot {
  display: block;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  margin-bottom: .85rem;
}

.page-faq .signal-card__dot--signal {
  background: var(--c-signal);
  box-shadow: 0 0 0 5px rgba(255, 107, 53, .16);
}

.page-faq .signal-card__dot--mist {
  background: var(--c-mist);
  box-shadow: 0 0 0 5px rgba(169, 180, 194, .14);
}

.page-faq .signal-card__dot--mint {
  background: var(--c-mint);
  box-shadow: 0 0 0 5px rgba(46, 196, 182, .16);
}

.page-faq .signal-card__label {
  display: block;
  font-family: var(--font-display);
  font-size: 1.12rem;
  letter-spacing: -.01em;
  color: var(--c-paper);
}

.page-faq .signal-card__hint {
  display: block;
  margin-top: .4rem;
  font-size: var(--fs-small);
  line-height: 1.65;
  color: var(--c-text-dim);
}

.page-faq .signal-card__go {
  display: block;
  margin-top: .9rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .08em;
  color: var(--c-signal);
}

/* ---------- 现象 / 步骤 双栏 ---------- */
.page-faq .faq-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  margin-top: 1.75rem;
}

.page-faq .faq-flow__title {
  margin: 0 0 .85rem;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  letter-spacing: -.01em;
  color: var(--c-ink);
}

.page-faq .section--deep .faq-flow__title {
  color: var(--c-paper);
}

.page-faq .plain-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .plain-list li {
  position: relative;
  padding: .55rem 0 .55rem 1.4rem;
  border-bottom: 1px dashed rgba(7, 19, 34, .16);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--c-ink-soft);
}

.page-faq .plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.22em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-signal);
}

/* ---------- 步骤列表 ---------- */
.page-faq .step-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .step-list__item {
  position: relative;
  display: flex;
  gap: .85rem;
  padding: 0 0 1.1rem 0;
}

.page-faq .step-list__item::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 28px;
  bottom: 0;
  width: 1px;
  background: rgba(255, 107, 53, .35);
}

.page-faq .step-list__item:last-child {
  padding-bottom: 0;
}

.page-faq .step-list__item:last-child::before {
  display: none;
}

.page-faq .step-list__num {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 27px;
  height: 27px;
  border-radius: 50%;
  background: rgba(255, 107, 53, .14);
  border: 1px solid var(--c-signal);
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
  color: var(--c-signal);
}

.page-faq .step-list__item p {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.72;
  color: var(--c-ink-soft);
}

.page-faq .step-list--on-dark .step-list__item p {
  color: var(--c-text-dim);
}

/* ---------- 提示框 ---------- */
.page-faq .tip-box {
  margin-top: 1.75rem;
  padding: 1.15rem 1.25rem;
  border-radius: var(--radius-m);
  background: var(--c-sand);
  border-left: 3px solid var(--c-mint-deep);
}

.page-faq .tip-box__label {
  margin: 0 0 .45rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-mint-deep);
}

.page-faq .tip-box__text {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--c-ink-soft);
}

.page-faq .tip-box__text a {
  color: var(--c-ink);
  text-decoration: underline;
  text-decoration-color: var(--c-signal);
  text-underline-offset: 3px;
}

/* ---------- 折叠面板 ---------- */
.page-faq .faq-panel {
  margin-top: .85rem;
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-faq .faq-panel--light {
  background: #fff;
  border: 1px solid rgba(7, 19, 34, .14);
}

.page-faq .faq-panel--dark {
  background: var(--c-navy-2);
  border: 1px solid var(--c-line);
}

.page-faq .faq-panel__summary {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  padding: 1rem 1.15rem;
  cursor: pointer;
  list-style: none;
  font-size: var(--fs-body);
  font-weight: 600;
  transition: color .2s ease;
}

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

.page-faq .faq-panel--light .faq-panel__summary {
  color: var(--c-ink);
}

.page-faq .faq-panel--dark .faq-panel__summary {
  color: var(--c-paper);
}

.page-faq .faq-panel__marker {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--c-mist);
  transition: background .2s ease, transform .2s ease;
}

.page-faq .faq-panel[open] .faq-panel__marker {
  background: var(--c-mint);
  transform: rotate(45deg);
}

.page-faq .faq-panel__summary:hover .faq-panel__marker {
  background: var(--c-signal);
}

.page-faq .faq-panel__body {
  padding: 0 1.15rem 1.15rem 2.35rem;
  animation: faq-fade .28s ease both;
}

.page-faq .faq-panel__body p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.82;
}

.page-faq .faq-panel--light .faq-panel__body p {
  color: var(--c-ink-soft);
}

.page-faq .faq-panel--dark .faq-panel__body p {
  color: var(--c-text-dim);
}

@keyframes faq-fade {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 大屏异常 ---------- */
.page-faq .screen-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  margin-top: 1.75rem;
}

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

.page-faq .media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-m);
  border: 1px solid var(--c-line);
}

.page-faq .media__caption {
  margin: .65rem 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--c-mist);
}

.page-faq .prompt-box {
  margin-bottom: 1.5rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-s);
  background: var(--c-void);
  border: 1px solid var(--c-line-strong);
  border-left: 3px solid var(--c-mint);
}

.page-faq .prompt-box__line {
  margin: 0 0 .4rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  line-height: 1.7;
  letter-spacing: .03em;
  color: var(--c-mint);
  word-break: break-word;
}

.page-faq .prompt-box__line:last-child {
  margin-bottom: 0;
  color: var(--c-text-dim);
}

/* ---------- 订阅与设备 ---------- */
.page-faq .device-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  margin-top: 1.75rem;
}

.page-faq .check-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .check-list__item {
  display: flex;
  align-items: flex-start;
  gap: .8rem;
  padding: .7rem 0;
  border-bottom: 1px dashed rgba(7, 19, 34, .18);
}

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

.page-faq .check-list__box {
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  margin: .16rem 0 0;
  accent-color: var(--c-mint-deep);
  cursor: pointer;
}

.page-faq .check-list__label {
  cursor: pointer;
}

.page-faq .check-list__text {
  display: block;
  font-size: var(--fs-body);
  line-height: 1.72;
  color: var(--c-ink-soft);
}

.page-faq .check-list__box:checked + .check-list__label .check-list__text {
  color: var(--c-mint-deep);
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}

.page-faq .device-grid__note {
  margin: 1.15rem 0 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--c-ink-soft);
}

.page-faq .device-grid__note a {
  color: var(--c-ink);
  text-decoration: underline;
  text-decoration-color: var(--c-signal);
  text-underline-offset: 3px;
}

/* ---------- 联系支持 ---------- */
.page-faq .support-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.15rem;
  margin-top: 1.75rem;
}

.page-faq .support-card {
  padding: 1.35rem 1.3rem 1.5rem;
  border-radius: var(--radius-m);
  background: var(--c-navy-2);
  border: 1px solid var(--c-line);
}

.page-faq .support-card--contact {
  background: linear-gradient(160deg, var(--c-navy-3), var(--c-navy-2));
  border-color: rgba(255, 107, 53, .38);
}

.page-faq .support-card__title {
  margin: 0 0 .75rem;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  letter-spacing: -.01em;
  color: var(--c-paper);
}

.page-faq .support-card__text {
  margin: .9rem 0 0;
  font-size: var(--fs-small);
  line-height: 1.78;
  color: var(--c-text-dim);
}

.page-faq .support-card__text a {
  color: var(--c-signal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .mail-template {
  margin: 0;
  padding: 1rem;
  border-radius: var(--radius-s);
  background: var(--c-void);
  border: 1px solid var(--c-line);
  overflow-x: auto;
}

.page-faq .mail-template code {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  line-height: 1.85;
  color: var(--c-mint);
  white-space: pre;
}

.page-faq .support-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .support-list__item {
  display: flex;
  flex-wrap: wrap;
  gap: .2rem .9rem;
  padding: .6rem 0;
  border-bottom: 1px solid var(--c-line);
}

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

.page-faq .support-list__label {
  flex: 0 0 auto;
  min-width: 5.2em;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .08em;
  color: var(--c-mist);
}

.page-faq .support-list__value {
  font-size: var(--fs-small);
  line-height: 1.6;
  color: var(--c-paper);
  word-break: break-word;
}

.page-faq .faq-backlink {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-backlink__text {
  font-size: var(--fs-small);
  color: var(--c-mist);
  text-decoration: underline;
  text-decoration-color: var(--c-signal);
  text-underline-offset: 3px;
}

.page-faq .faq-backlink__text:hover {
  color: var(--c-paper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .page-faq .signal-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-faq .support-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-flow {
    grid-template-columns: 1fr 1.15fr;
    gap: 2.5rem;
  }

  .page-faq .screen-split {
    grid-template-columns: 1fr 1fr;
    align-items: start;
    gap: 2.5rem;
  }

  .page-faq .device-grid {
    grid-template-columns: 1.25fr .85fr;
    align-items: start;
    gap: 2.5rem;
  }

  .page-faq .signal-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-hero__inner {
    padding-right: 3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .signal-card,
  .page-faq .faq-panel__body,
  .page-faq .faq-panel__marker {
    transition: none;
    animation: none;
  }

  .page-faq .signal-card:hover {
    transform: none;
  }
}