.layout-signal { color-scheme: dark; }
.layout-signal body { background: var(--theme-surface); }
.signal-shell { position: relative; min-height: 100vh; }
.signal-scan {
  pointer-events: none; position: fixed; inset: 0; z-index: 0;
  background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(57,255,136,0.03) 2px, rgba(57,255,136,0.03) 4px);
}
.signal-header, .signal-main, .signal-footer { position: relative; z-index: 1; }
.signal-header-grid {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 16px;
  width: min(var(--content-max-width), calc(100% - 32px)); margin: 0 auto; padding: 20px 0;
  border-bottom: 1px solid var(--border-color);
}
.signal-kicker { margin: 0; font-size: 0.7rem; letter-spacing: 0.2em; color: var(--theme-primary); }
.signal-title { margin: 4px 0 0; font-family: var(--font-display); font-weight: 800; }
.signal-title a { text-decoration: none; color: var(--text-body); }
.signal-tag { margin: 4px 0 0; font-size: 0.8rem; color: var(--text-muted); }
.signal-main { width: min(var(--content-max-width), calc(100% - 32px)); margin: 0 auto; padding-bottom: 40px; }
.signal-hero {
  margin: 28px 0; padding: 24px; border: 1px solid var(--border-color);
  background: var(--theme-card); border-radius: var(--radius-panel);
}
.signal-prompt { margin: 0 0 8px; color: var(--theme-primary); font-size: 0.85rem; }
.signal-hero h1 { margin: 0 0 8px; font-family: var(--font-display); font-size: clamp(1.4rem, 3vw, 2rem); }
.signal-about { margin-top: 32px; padding: 20px; border-left: 3px solid var(--theme-primary); background: var(--theme-card); }
.signal-footer {
  border-top: 1px solid var(--border-color); padding: 24px 16px 40px;
  display: grid; gap: 12px; justify-items: center; text-align: center;
}
.signal-footer-bars { display: flex; gap: 4px; }
.signal-footer-bars span { width: 24px; height: 4px; background: var(--theme-primary); opacity: 0.5; }
.signal-footer-bars span:nth-child(2) { opacity: 0.8; width: 40px; }
.signal-footer-id { font-size: 0.75rem; letter-spacing: 0.15em; color: var(--theme-primary); margin: 0; }
.signal-footer a { color: var(--theme-primary); }