/* Signal Series article layout */

.article-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 48px;
  border-bottom: 1px solid transparent;
  transition: all 0.4s;
}

.article-nav.scrolled {
  background: rgba(28, 26, 24, 0.94);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--border);
}

.article-nav .nav-mark {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.article-nav .mark-img {
  height: 28px;
  width: auto;
}

.article-nav .logotype {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--light);
}

.article-nav .logotype span { color: var(--amber); }

.article-nav .back-link {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
  text-decoration: none;
  border: 1px solid var(--amber-d);
  background: var(--amber-g);
  padding: 8px 18px;
  transition: all 0.2s;
}

.article-nav .back-link:hover {
  background: var(--amber);
  color: var(--void);
}

.article-nav-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

@media (max-width: 768px) {
  .article-nav {
    flex-wrap: wrap;
    gap: 12px;
  }
  .article-nav-actions {
    width: 100%;
    justify-content: stretch;
  }
  .article-nav-actions .back-link {
    flex: 1;
    text-align: center;
  }
}

.article-main {
  padding: 100px 24px 80px;
  max-width: 720px;
  margin: 0 auto;
}

.article-kicker {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 20px;
}

.article-main h1 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 600;
  line-height: 1.15;
  color: var(--light);
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.article-deck {
  font-size: 17px;
  line-height: 1.6;
  color: var(--sub);
  margin-bottom: 40px;
  font-weight: 400;
}

.article-meta {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  padding-bottom: 32px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border);
}

.article-main h2 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--light);
  margin: 40px 0 16px;
  letter-spacing: -0.02em;
}

.article-main p {
  font-size: 17px;
  line-height: 1.85;
  color: var(--text);
  margin-bottom: 20px;
}

.article-main p em {
  color: var(--light);
  font-style: italic;
}

.article-pull {
  border-left: 3px solid var(--amber);
  padding: 20px 0 20px 24px;
  margin: 32px 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  line-height: 1.45;
  color: var(--light);
}

.article-footer-nav {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.article-footer-nav a {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 12px 20px;
  border: 1px solid var(--border);
  color: var(--sub);
  transition: all 0.2s;
}

.article-footer-nav a:hover {
  border-color: var(--amber);
  color: var(--amber);
}

.article-footer-nav a.primary {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--void);
}

.article-footer-nav a.primary:hover {
  background: var(--amber-b);
}

/* Measurement Gap interactive (Series 001) */
#measurement-gap-lab {
  margin: 40px 0 48px;
  padding: 28px;
  background: var(--panel);
  border: 1px solid var(--border);
}

#measurement-gap-lab .lab-heading {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 20px;
}

#measurement-gap-lab .lab-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

#measurement-gap-lab [data-state] {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 12px 18px;
  border: 1px solid var(--border);
  background: var(--void);
  color: var(--sub);
  cursor: pointer;
  transition: all 0.2s;
}

#measurement-gap-lab [data-state].active {
  border-color: var(--amber);
  color: var(--light);
  background: var(--amber-g);
  box-shadow: 0 0 0 1px var(--amber-d);
}

#measurement-gap-lab [data-state="-1"].active { color: var(--amber-b); }

#measurement-gap-lab .lab-mode-toggle {
  width: 100%;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 10px 14px;
  border: 1px dashed var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

#measurement-gap-lab .lab-mode-toggle:hover {
  border-color: var(--amber);
  color: var(--amber);
}

#measurement-gap-lab.binary-mode .lab-mode-toggle {
  border-style: solid;
  border-color: var(--amber-d);
  color: var(--amber);
}

#measurement-gap-lab .lab-canvas {
  position: relative;
  height: 200px;
  margin-bottom: 20px;
  border: 1px solid var(--border);
  background:
    radial-gradient(circle at 50% 50%, rgba(224, 77, 38, 0.14), transparent 55%),
    var(--deep);
  overflow: hidden;
}

#measurement-gap-lab .lab-dot {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--ash);
  transition: opacity 0.35s ease, transform 0.35s ease, box-shadow 0.35s ease;
}

#measurement-gap-lab .lab-dot[data-state="-1"] { left: 18%; top: 42%; }
#measurement-gap-lab .lab-dot[data-state="0"] { left: 50%; top: 58%; transform: translate(-50%, -50%); }
#measurement-gap-lab .lab-dot[data-state="1"] { right: 18%; top: 38%; }

#measurement-gap-lab .lab-dot.active {
  transform: scale(1.35);
  border-color: var(--amber-b);
  background: var(--amber);
  box-shadow: 0 0 24px rgba(224, 77, 38, 0.45);
}

#measurement-gap-lab .lab-dot[data-state="0"].active {
  transform: translate(-50%, -50%) scale(1.35);
}

#measurement-gap-lab .lab-dot.dim { opacity: 0.35; }
#measurement-gap-lab .lab-dot.hidden { opacity: 0.08; pointer-events: none; }

#measurement-gap-lab .lab-binary-bar {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}

#measurement-gap-lab.binary-mode .lab-binary-bar::after {
  content: ' · −1 suppressed';
  color: var(--amber);
}

#measurement-gap-lab .lab-state-label {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--light);
  margin-bottom: 8px;
}

#measurement-gap-lab .lab-binary {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--amber);
  margin-bottom: 10px;
}

#measurement-gap-lab .lab-detail {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}

@media (max-width: 768px) {
  .article-nav { padding: 16px 20px; }
  .article-main { padding-top: 88px; }
  #measurement-gap-lab { padding: 20px 16px; }
}