.page-faq {
  --faq-panel: rgba(7, 21, 18, .72);
  --faq-panel-soft: rgba(61, 90, 76, .18);
  --faq-grid-line: rgba(42, 52, 49, .38);
  --faq-mint-line: rgba(61, 242, 182, .45);
  color: var(--paper);
}

.page-faq .breadcrumb {
  padding-top: 1.25rem;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(2rem, 6vw, 4rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--faq-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--faq-grid-line) 1px, transparent 1px);
  background-size: 80px 80px, 80px 80px;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 18% 0%, rgba(11, 31, 26, 0) 0%, var(--ink-800) 76%);
  pointer-events: none;
}

.page-faq .faq-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
}

.page-faq .faq-hero-copy h1 {
  margin: .55rem 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 8vw, 3.5rem);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -.015em;
  color: var(--white);
}

.page-faq .faq-hero-copy .lede {
  max-width: 48ch;
  color: var(--muted);
}

.page-faq .faq-device-row {
  display: grid;
  gap: .75rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-device {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: .85rem 1rem;
  border: 1px solid var(--line);
  border-left-width: 3px;
  background: var(--faq-panel);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.page-faq .faq-device--ios { border-left-color: var(--amber); }
.page-faq .faq-device--android { border-left-color: var(--clay); }
.page-faq .faq-device--pad { border-left-color: var(--aqua); }

.page-faq .faq-device strong {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--white);
}

.page-faq .faq-device .mono {
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-device-note {
  font-size: .82rem;
  color: var(--moss);
  filter: brightness(1.7);
}

.page-faq .faq-hero-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--faq-panel);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  overflow: hidden;
}

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

/* ---------- 主体布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: 2.25rem;
}

.page-faq .faq-index {
  padding: 1.1rem 1rem;
  border: 1px solid var(--line);
  background: var(--faq-panel);
  position: relative;
}

.page-faq .faq-index::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 2px;
  background: linear-gradient(180deg, var(--mint), transparent 85%);
  opacity: .7;
}

.page-faq .faq-index-title {
  margin: 0 0 .7rem;
  font-size: .74rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-index-list {
  display: grid;
  gap: .1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index-list a {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  padding: .5rem .6rem;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-size: .9rem;
  text-decoration: none;
  transition: color .25s var(--ease), border-color .25s var(--ease), background-color .25s var(--ease);
}

.page-faq .faq-index-list a:hover,
.page-faq .faq-index-list a:focus-visible {
  color: var(--mint);
  border-left-color: var(--mint);
  background: var(--faq-panel-soft);
}

.page-faq .faq-index-list .mono {
  font-size: .74rem;
  color: var(--moss);
  filter: brightness(1.8);
  font-variant-numeric: tabular-nums;
}

/* ---------- 问答区块 ---------- */
.page-faq .faq-block + .faq-block {
  margin-top: clamp(2.5rem, 5vw, 3.5rem);
}

.page-faq .faq-block-head {
  display: grid;
  gap: .55rem;
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-block-title {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.page-faq .faq-block-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 4.2vw, 1.95rem);
  font-weight: 800;
  line-height: 1.25;
  color: var(--white);
}

.page-faq .faq-block-head p {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: .95rem;
}

.page-faq .faq-figure {
  margin: 0 0 1.5rem;
  border: 1px solid var(--line);
  background: var(--faq-panel);
  overflow: hidden;
}

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

.page-faq .faq-figure figcaption {
  padding: .7rem 1rem;
  border-top: 1px solid var(--line);
  font-size: .82rem;
  color: var(--muted);
}

.page-faq .qa {
  border: 1px solid var(--line);
  background: var(--faq-panel);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  transition: border-color .25s var(--ease);
}

.page-faq .qa + .qa {
  margin-top: .75rem;
}

.page-faq .qa:hover {
  border-color: var(--moss);
}

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

.page-faq .qa summary {
  display: flex;
  align-items: baseline;
  gap: .85rem;
  padding: 1.05rem 1.15rem;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 1rem;
  color: var(--paper);
}

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

.page-faq .qa summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--mint);
}

.page-faq .qa[open] summary::after {
  content: "−";
}

.page-faq .qa-q {
  flex: 1;
}

.page-faq .qa-num {
  flex: none;
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-faq .qa-body {
  padding: 0 1.15rem 1.2rem;
  color: var(--muted);
  font-size: .95rem;
}

.page-faq .qa-body p {
  margin: 0 0 .75rem;
}

.page-faq .qa-body p:last-child {
  margin-bottom: 0;
}

.page-faq .qa-body strong {
  color: var(--paper);
  font-weight: 700;
}

.page-faq .qa-body .mono {
  color: var(--aqua);
  font-size: .88rem;
  word-break: break-all;
}

.page-faq .qa-body a {
  color: var(--mint);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .qa-body a:hover {
  color: var(--aqua);
}

/* ---------- 结尾引导 ---------- */
.page-faq .faq-cta {
  display: grid;
  gap: 1.25rem;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  background: linear-gradient(135deg, var(--faq-panel-soft), var(--faq-panel));
}

.page-faq .faq-cta h2 {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3.6vw, 1.8rem);
  font-weight: 800;
  color: var(--white);
}

.page-faq .faq-cta p {
  margin: 0;
  max-width: 56ch;
  color: var(--muted);
  font-size: .95rem;
}

.page-faq .faq-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-faq .faq-device-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
    gap: 3rem;
  }

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

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-faq .faq-side {
    position: sticky;
    top: 104px;
  }

  .page-faq .qa summary {
    padding: 1.15rem 1.35rem;
    font-size: 1.05rem;
  }

  .page-faq .qa-body {
    padding: 0 1.35rem 1.35rem;
    font-size: 1rem;
    line-height: 1.75;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .faq-index-list a {
    transition: none;
  }
}