/**
 * arc-ledger /app：双列 + 右侧说明卡（非伪终端）
 */
.layout-arc.app-arc-page {
  --aa-bg: #f0f7ff;
  --aa-panel: #ffffff;
  --aa-line: rgba(15, 23, 42, 0.1);
  --aa-text: #1e293b;
  --aa-dim: #64748b;
  --aa-mint: #2563eb;
  --aa-violet: #7c3aed;
  --aa-gold: #ffc107;
}

.arc-app {
  background: linear-gradient(180deg, #e0efff 0%, #f8fafc 40%, #ffffff 100%);
  color: var(--aa-text);
  min-height: calc(100vh - 120px);
  padding: 36px 20px 64px;
}

.arc-app-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--aa-line);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.1);
}

@media (max-width: 880px) {
  .arc-app-inner {
    grid-template-columns: 1fr;
  }
}

.arc-app-left {
  padding: 40px 36px 44px;
  background: linear-gradient(145deg, #e0efff 0%, #f8fafc 55%, #ffffff 100%);
  border-right: 1px solid var(--aa-line);
}

@media (max-width: 880px) {
  .arc-app-left {
    border-right: none;
    border-bottom: 1px solid var(--aa-line);
  }
}

.arc-app-badge {
  display: inline-block;
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--aa-mint);
  margin-bottom: 16px;
}

.arc-app-left h1 {
  margin: 0 0 14px;
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  font-weight: 800;
  line-height: 1.2;
}

.arc-app-lead {
  margin: 0 0 28px;
  color: var(--aa-dim);
  font-size: 1rem;
  line-height: 1.65;
  max-width: 40ch;
}

.arc-app-bullets {
  margin: 0 0 32px;
  padding: 0;
  list-style: none;
}

.arc-app-bullets li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 12px;
  font-size: 0.92rem;
  color: var(--aa-text);
  line-height: 1.5;
}

.arc-app-bullets li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--aa-mint);
  font-weight: 700;
}

.arc-app-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.arc-app-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 0.12s ease;
}

.arc-app-actions a:hover {
  transform: translateY(-2px);
}

.arc-app-actions .apk {
  background: linear-gradient(118deg, #5b9fff, #417fff, #2f65d4);
  color: #ffffff;
  box-shadow: 0 10px 28px rgba(65, 127, 255, 0.28);
}

.arc-app-actions .ios {
  border: 1px solid var(--aa-line);
  color: var(--aa-text);
  background: #ffffff;
}

.arc-app-meta {
  margin-top: 28px;
  font-size: 0.8rem;
  color: var(--aa-dim);
  line-height: 1.55;
}

.arc-app-right {
  padding: 36px 32px 40px;
  background: var(--aa-panel);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.arc-app-sidecard {
  border: 1px solid var(--aa-line);
  border-radius: 14px;
  padding: 18px 18px 20px;
  background: #f8fafc;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.arc-app-sidecard__title {
  margin: 0 0 14px;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--aa-mint);
  font-weight: 800;
}

.arc-app-sidecard__steps {
  margin: 0;
  padding-left: 1.2em;
  color: var(--aa-dim);
  font-size: 0.88rem;
  line-height: 1.55;
}

.arc-app-sidecard__steps li {
  margin-bottom: 14px;
}

.arc-app-sidecard__steps li:last-child {
  margin-bottom: 0;
}

.arc-app-sidecard__steps strong {
  display: block;
  color: var(--aa-text);
  margin-bottom: 4px;
  font-size: 0.9rem;
  font-weight: 700;
}

.arc-app-sidecard__steps span {
  display: block;
}

.arc-app-shots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

/* 四格掠影：4:3 更接近参考稿（手机/仪表盘/人像混排），非竖屏手机框 */
.arc-app-shots figure {
  margin: 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--aa-line);
  aspect-ratio: 4 / 3;
  background: #e2e8f0;
}

.arc-app-shots img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.arc-app-changelog {
  border-top: 1px solid var(--aa-line);
  padding-top: 16px;
  margin-top: 4px;
}

.arc-app-changelog h2 {
  margin: 0 0 8px;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: var(--aa-dim);
}

.arc-app-changelog .ver {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--aa-mint);
}

.arc-app-changelog .date {
  font-size: 0.8rem;
  color: var(--aa-dim);
  margin-left: 8px;
}

.arc-app-changelog__hint {
  margin: 12px 0 0;
  font-size: 0.8rem;
  color: var(--aa-dim);
  line-height: 1.5;
}

.arc-app-lead--second {
  margin-top: 14px;
}

.arc-app-below {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 20px 56px;
}

.arc-app-section {
  margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(91, 154, 255, 0.16);
}

.arc-app-section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.arc-app-section__h {
  margin: 0 0 12px;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--aa-text);
}

.arc-app-section__lead {
  margin: 0 0 16px;
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--aa-dim);
  max-width: 68ch;
}

.arc-app-feature-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.arc-app-feature-list li {
  margin-bottom: 14px;
  padding-left: 0;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--aa-dim);
}

.arc-app-feature-list li:last-child {
  margin-bottom: 0;
}

.arc-app-feature-list strong {
  display: block;
  color: var(--aa-text);
  margin-bottom: 4px;
  font-size: 0.92rem;
}

.arc-app-faq {
  margin: 0;
}

.arc-app-faq__item {
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px dashed rgba(138, 155, 176, 0.28);
}

.arc-app-faq__item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.arc-app-faq dt {
  font-weight: 700;
  color: var(--aa-text);
  margin-bottom: 6px;
  font-size: 0.92rem;
}

.arc-app-faq dd {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--aa-dim);
}

.arc-app-inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.arc-app-inline-links a {
  color: var(--aa-mint);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
}

.arc-app-inline-links a:hover {
  text-decoration: underline;
}

.arc-app-scene-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.arc-app-scene-list li {
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px dashed rgba(138, 155, 176, 0.22);
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--aa-dim);
}

.arc-app-scene-list li:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.arc-app-scene-list strong {
  display: block;
  color: var(--aa-text);
  margin-bottom: 6px;
  font-size: 0.93rem;
}

.arc-app-section__footnote {
  margin: 18px 0 0;
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--aa-dim);
  max-width: 72ch;
}