:root {
  --bg-color: #0f1115;
  --card-bg: #1a1d24;
  --card-hover: #22262f;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --text-muted: #6b7280;
  --accent-primary: #00d2ff;
  --accent-secondary: #ff00ff;
  --accent-tertiary: #00ff9d;
  --danger: #ff4a4a;
  --warning: #ffaa00;
  --border-color: #2a2e36;
  --border-focus: #4a4f5a;
  --radius-sm: 4px;
  --radius-md: 8px;
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Inter', sans-serif;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
}

header {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
}

h1 {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.badge {
  background: rgba(0, 210, 255, 0.1);
  color: var(--accent-primary);
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  border: 1px solid rgba(0, 210, 255, 0.2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

main {
  flex: 1;
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 280px 1fr 1fr;
  gap: 1.5rem;
  height: auto;
  min-height: calc(100vh - 70px);
  max-width: 1920px;
  margin: 0 auto;
  width: 100%;
}

@media (max-width: 1200px) {
  main {
    grid-template-columns: 280px 1fr;
  }

  .matrix-container {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  main {
    grid-template-columns: 1fr;
  }
}

.panel {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  height: fit-content;
}

.panel-header {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  font-weight: 700;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 500;
}

.value-display {
  font-family: var(--font-mono);
  color: var(--accent-primary);
  font-size: 0.75rem;
  background: rgba(0, 210, 255, 0.1);
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-sm);
}

.value-input {
  font-family: var(--font-mono);
  color: var(--accent-primary);
  font-size: 0.75rem;
  background: rgba(0, 210, 255, 0.1);
  padding: 0.1rem 0.4rem;
  border: 1px solid rgba(0, 210, 255, 0.2);
  border-radius: var(--radius-sm);
  width: 60px;
  text-align: right;
}

select,
input[type='range'] {
  width: 100%;
  background: transparent;
  cursor: pointer;
}

select {
  background-color: var(--bg-color);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.8rem;
}

input[type='range'] {
  -webkit-appearance: none;
}

input[type='range']::-webkit-slider-runnable-track {
  width: 100%;
  height: 4px;
  background: var(--border-color);
  border-radius: 2px;
}

input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  height: 14px;
  width: 14px;
  border-radius: 50%;
  background: var(--accent-primary);
  margin-top: -5px;
  transition: transform 0.1s;
}

input[type='range']::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.button-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

button {
  padding: 0.75rem;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #000;
}

.btn-primary:hover {
  background-color: #33dbff;
}

.btn-secondary {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  border-color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.05);
}

.btn-danger {
  background-color: rgba(255, 74, 74, 0.1);
  color: var(--danger);
  border: 1px solid rgba(255, 74, 74, 0.3);
}

.btn-danger:hover {
  background-color: rgba(255, 74, 74, 0.2);
}

.math-block {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  background: #13151a;
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  line-height: 1.6;
}

.viz-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  height: auto;
  min-height: 70vh;
}

.metrics-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem;
}

.metric-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 0.75rem;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.metric-label {
  font-size: 0.6rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 700;
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.canvas-wrapper {
  flex: 1;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
  min-height: 400px;
}

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

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

.matrix-wrapper {
  flex: 1;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
  min-height: 400px;
}

.matrix-title {
  position: absolute;
  top: 10px;
  left: 10px;
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 700;
  z-index: 10;
  background: rgba(26, 29, 36, 0.9);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}

.colorbar {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 200px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
}

.colorbar-gradient {
  flex: 1;
  border-radius: var(--radius-sm);
}

.colorbar-labels {
  position: absolute;
  right: 30px;
  top: 50%;
  transform: translateY(-50%);
  height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  font-size: 0.6rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

#loading {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-color);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  flex-direction: column;
  gap: 1rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.hidden {
  display: none !important;
}

.knot-preset {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.knot-preset button {
  padding: 0.5rem;
  font-size: 0.65rem;
}
.home-link {
  position: fixed;
  top: 12px;
  right: 12px;
  z-index: 9999;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  background: rgba(26, 29, 36, 0.92);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  text-decoration: none;
  backdrop-filter: blur(8px);
  transition: all 0.15s ease;
}
.home-link:hover {
  background: var(--card-hover);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}