/* ============================================
   nslabs — The Core Issue
   System fault log / diagnostic console
   ============================================ */

:root {
  --bg-deep: #07090f;
  --bg-panel: #0d1324;
  --bg-elevated: #121a30;
  --accent: #4f7df5;
  --accent-2: #8b5cf6;
  --warn: #fbbf24;
  --danger: #f87171;
  --text-primary: #e8ecf6;
  --text-secondary: #8a93ad;
  --text-dim: #5b6480;
  --border: rgba(140, 160, 220, 0.10);
  --border-strong: rgba(140, 160, 220, 0.18);
  --radius-md: 12px;
  --radius-lg: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ============================================
   SECTION
   ============================================ */
.ns-problem {
  position: relative;
  padding: 140px 24px;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(800px 400px at 90% 10%, rgba(251, 191, 36, 0.06), transparent 60%),
    radial-gradient(900px 500px at 10% 90%, rgba(248, 113, 113, 0.06), transparent 60%),
    linear-gradient(180deg, #07090f 0%, #0a0e1a 100%);
}

.ns-problem::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(140, 160, 220, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(140, 160, 220, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, #000 30%, transparent 80%);
  pointer-events: none;
}

.ns-container {
  max-width: 1180px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

/* ============================================
   HEADER
   ============================================ */
.ns-problem-header {
  text-align: center;
  margin-bottom: 80px;
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
}

.ns-problem-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: "SF Mono", "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.32em;
  color: var(--warn);
  padding: 8px 16px;
  border: 1px solid rgba(251, 191, 36, 0.3);
  border-radius: 100px;
  background: rgba(251, 191, 36, 0.08);
  margin-bottom: 28px;
}

.ns-problem-label::before {
  content: "⚠";
  font-size: 12px;
  animation: pbBlink 1.4s ease-in-out infinite;
}

@keyframes pbBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.ns-problem-title {
  font-size: clamp(2rem, 4.6vw, 3.2rem);
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--text-primary);
}

/* ============================================
   CONSOLE SHELL
   ============================================ */
.ns-problem-timeline {
  position: relative;
  padding: 0;
  background: linear-gradient(180deg, rgba(13, 19, 36, 0.7), rgba(7, 9, 15, 0.7));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
}

/* Console header bar */
.ns-problem-timeline::before {
  content: "system.diagnostics — 4 faults detected";
  display: block;
  padding: 14px 22px;
  font-family: "SF Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  background: rgba(7, 9, 15, 0.8);
  border-bottom: 1px solid var(--border-strong);
  position: relative;
}

/* Traffic-light dots */
.ns-problem-timeline::after {
  content: "";
  position: absolute;
  top: 16px;
  right: 22px;
  width: 38px;
  height: 10px;
  background:
    radial-gradient(circle 4px at 5px 5px, var(--danger) 99%, transparent),
    radial-gradient(circle 4px at 19px 5px, var(--warn) 99%, transparent),
    radial-gradient(circle 4px at 33px 5px, #4ade80 99%, transparent);
}

/* ============================================
   FAULT ENTRY
   ============================================ */
.timeline-item {
  display: grid;
  grid-template-columns: 90px 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 28px 28px;
  border-bottom: 1px solid var(--border);
  position: relative;
  cursor: pointer;
  transition: background 0.4s, padding 0.4s;
  overflow: hidden;
}

.timeline-item:last-child { border-bottom: none; }

.timeline-item::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.timeline-item::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(79, 125, 245, 0.06), transparent 60%);
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
}

.timeline-item:hover {
  background: rgba(18, 26, 48, 0.4);
}

.timeline-item:hover::before { transform: scaleY(1); }
.timeline-item:hover::after { opacity: 1; }

/* Number column */
.timeline-number {
  font-family: "SF Mono", monospace;
  font-size: 2.2rem;
  font-weight: 200;
  color: var(--text-dim);
  letter-spacing: -0.02em;
  -webkit-text-stroke: 1px rgba(140, 160, 220, 0.2);
  -webkit-text-fill-color: transparent;
  transition: color 0.3s, -webkit-text-fill-color 0.3s;
  line-height: 1;
}

.timeline-item:hover .timeline-number {
  -webkit-text-fill-color: var(--accent);
  -webkit-text-stroke-color: transparent;
}

/* Content */
.timeline-content {
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
  z-index: 1;
}

.timeline-content h3 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 12px;
}

.timeline-content h3::before {
  content: "FAULT";
  font-family: "SF Mono", monospace;
  font-size: 9px;
  letter-spacing: 0.25em;
  color: var(--danger);
  background: rgba(248, 113, 113, 0.12);
  border: 1px solid rgba(248, 113, 113, 0.3);
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 500;
  flex-shrink: 0;
}

.timeline-content p {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--text-secondary);
  max-width: 640px;
}

/* Severity meter (right-side visual) */
.timeline-item .severity {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  position: relative;
  z-index: 1;
}

.severity-label {
  font-family: "SF Mono", monospace;
  font-size: 9px;
  letter-spacing: 0.25em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.severity-bars {
  display: flex;
  gap: 3px;
}

.severity-bars span {
  width: 5px;
  height: 18px;
  background: rgba(140, 160, 220, 0.12);
  border-radius: 1px;
  transition: background 0.3s, height 0.3s;
}

.severity-bars span.on {
  background: linear-gradient(180deg, var(--warn), var(--danger));
  box-shadow: 0 0 8px rgba(248, 113, 113, 0.5);
}

.timeline-item:hover .severity-bars span.on { animation: pbBars 1s ease-in-out infinite; }

@keyframes pbBars {
  0%, 100% { transform: scaleY(1); }
  50% { transform: scaleY(0.7); }
}

/* ============================================
   CONCLUSION
   ============================================ */
.ns-problem-conclusion {
  margin-top: 80px;
  padding: 56px 32px;
  text-align: center;
  background: linear-gradient(135deg, rgba(79, 125, 245, 0.10), rgba(139, 92, 246, 0.06));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}

.ns-problem-conclusion::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(120deg, var(--accent), transparent 40%, transparent 60%, var(--accent-2));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.5;
  pointer-events: none;
}

.ns-problem-conclusion::after {
  content: "";
  position: absolute;
  width: 400px; height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79,125,245,0.15), transparent 70%);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  filter: blur(60px);
  pointer-events: none;
  animation: pbBreath 5s ease-in-out infinite;
}

@keyframes pbBreath {
  0%, 100% { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 1; transform: translate(-50%, -50%) scale(1.15); }
}

.ns-problem-conclusion p {
  margin: 0;
  font-size: 1.4rem;
  line-height: 1.55;
  color: var(--text-secondary);
  position: relative;
  z-index: 1;
}

.ns-problem-conclusion strong {
  display: block;
  margin-top: 12px;
  font-size: 1.7rem;
  font-weight: 600;
  background: linear-gradient(120deg, var(--text-primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 820px) {
  .ns-problem { padding: 100px 18px; }
  .timeline-item {
    grid-template-columns: 60px 1fr;
    gap: 18px;
    padding: 22px 20px;
  }
  .timeline-item .severity {
    grid-column: 1 / -1;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding-left: 78px;
  }
  .timeline-number { font-size: 1.6rem; }
  .timeline-content h3 { font-size: 1.05rem; flex-wrap: wrap; gap: 8px; }
  .timeline-content p { font-size: 0.92rem; }
  .ns-problem-timeline::before { font-size: 9px; padding: 12px 18px; }
  .ns-problem-timeline::after { right: 14px; }
}

@media (max-width: 480px) {
  .ns-problem-conclusion { padding: 36px 22px; }
  .ns-problem-conclusion p { font-size: 1.1rem; }
  .ns-problem-conclusion strong { font-size: 1.3rem; }
}