/* Engineering Agent PID - Control Systems Theme */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600;700&family=Noto+Sans+SC:wght@400;500;700&display=swap');

:root {
  --bg: #0a0a0f;
  --card-bg: #12121a;
  --card-border: #1e1e2e;
  --text: #e4e4e7;
  --text-dim: #71717a;
  --accent: #22d3ee;
  --accent-glow: rgba(34, 211, 238, 0.15);
  --danger: #f43f5e;
  --warning: #f59e0b;
  --success: #10b981;
  --pid-p: #f472b6;
  --pid-i: #a78bfa;
  --pid-d: #34d399;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-sans: 'Noto Sans SC', -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  padding: 1rem;
}

main {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1.5rem;
}

.hero {
  text-align: center;
}

.kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

h1 {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, var(--accent), var(--pid-p));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.lede {
  font-size: 1.1rem;
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto 1.5rem;
}

.video-block {
  margin-top: 1.5rem;
}

.video-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

video {
  width: 100%;
  max-width: 700px;
  border-radius: 8px;
  background: #000;
}

.metric-row {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.metric-chip {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  min-width: 120px;
  text-align: center;
}

.metric-chip .num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.metric-chip.warn .num {
  color: var(--warning);
}

.metric-chip .label {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.panel-head {
  margin-bottom: 1.5rem;
}

.panel-head h2 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.panel-head p {
  font-size: 0.9rem;
  color: var(--text-dim);
}

.sim-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
}

@media (max-width: 700px) {
  .sim-grid {
    grid-template-columns: 1fr;
  }
}

.control {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.control label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  display: block;
  margin-bottom: 0.25rem;
}

.control input[type="range"] {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--card-border);
  -webkit-appearance: none;
  appearance: none;
}

.control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 10px var(--accent-glow);
}

.sub-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 0.5rem;
}

.preset-row {
  display: flex;
  gap: 0.5rem;
}

.preset-btn {
  flex: 1;
  padding: 0.5rem;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--card-border);
  border-radius: 6px;
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.2s;
}

.preset-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.preset-btn.is-active {
  background: var(--accent-glow);
  border-color: var(--accent);
  color: var(--accent);
}

.pulse-btn {
  margin-top: 0.5rem;
  padding: 0.75rem;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  background: linear-gradient(135deg, var(--pid-p), var(--pid-i));
  border: none;
  border-radius: 6px;
  color: #fff;
  cursor: pointer;
  transition: all 0.2s;
}

.pulse-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(244, 114, 182, 0.3);
}

.dashboard {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.gauge-block {
  text-align: center;
}

.g-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.stability-meter {
  height: 8px;
  background: var(--card-border);
  border-radius: 4px;
  overflow: hidden;
  max-width: 300px;
  margin: 0 auto;
}

.stability-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--danger), var(--warning), var(--success));
  transition: width 0.3s ease;
}

.g-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 0.5rem;
}

.canvas-block {
  background: rgba(0,0,0,0.3);
  border-radius: 8px;
  padding: 1rem;
}

canvas {
  width: 100%;
  height: 200px;
  display: block;
}

.canvas-legend {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--text-dim);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dot.target { background: var(--accent); }
.dot.actual { background: var(--success); }
.dot.error { background: var(--danger); }

.metrics-panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.metric-box {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--card-border);
  border-radius: 6px;
  padding: 0.75rem;
  text-align: center;
}

.mb-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  margin-bottom: 0.25rem;
}

.mb-value {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
}

.insight {
  font-size: 0.9rem;
  color: var(--text);
  padding: 1rem;
  background: var(--accent-glow);
  border-radius: 6px;
  border-left: 3px solid var(--accent);
}

/* Taste Lab */
.taste-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.taste-slider {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.taste-slider label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  min-width: 140px;
}

.taste-slider input {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: var(--card-border);
  -webkit-appearance: none;
}

.taste-slider input::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--pid-i);
  cursor: pointer;
}

.slider-value {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  min-width: 40px;
  text-align: right;
}

.feedback-loop {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem;
  background: rgba(0,0,0,0.2);
  border-radius: 8px;
}

.loop-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.node-icon {
  font-size: 1.5rem;
}

.node-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
}

.loop-arrow {
  font-size: 1.25rem;
  color: var(--text-dim);
}

.loop-arrow.feedback {
  color: var(--success);
}

.output-preview {
  background: rgba(0,0,0,0.3);
  border-radius: 8px;
  padding: 1rem;
}

.preview-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.preview-content {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text);
  line-height: 1.8;
}

/* Paradigm Shift */
.shift-timeline {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
  padding-left: 2rem;
}

.shift-timeline::before {
  content: '';
  position: absolute;
  left: 0.5rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--card-border);
}

.shift-item {
  position: relative;
}

.shift-marker {
  position: absolute;
  left: -2rem;
  top: 0.25rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--card-bg);
}

.shift-content h3 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
  color: var(--accent);
}

.shift-content p {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Takeaways */
.takeaways h2 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.takeaways ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.takeaways li {
  padding-left: 1.5rem;
  position: relative;
  color: var(--text);
}

.takeaways li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
}

.source-link {
  display: inline-block;
  margin-top: 1.5rem;
  padding: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  background: var(--accent-glow);
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.2s;
}

.source-link:hover {
  background: rgba(34, 211, 238, 0.25);
}