html {
  background: #fafafa;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  min-height: 100vh;
  font-weight: 300;
}

body {
  margin: 0;
  padding: 0;
  color: #2d3748;
}

h1 {
  text-align: center;
  color: #1a202c;
  font-size: 2.5rem;
  font-weight: 300;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.2;
}

.subtitle {
  text-align: center;
  color: #4a5568;
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  font-weight: 300;
}

.link-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.link-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 400;
  font-size: 0.9rem;
  transition: all 200ms ease;
  border: 1px solid #e2e8f0;
  background: white;
  color: #2d3748;
  min-width: 130px;
  justify-content: center;
}

.link-btn:hover {
  border-color: #cbd5e0;
  background: #f7fafc;
}

.btn-icon {
  font-size: 1rem;
  display: flex;
  align-items: center;
  line-height: 1;
}

.btn-text {
  letter-spacing: 0.01em;
  font-weight: 400;
}

.blog-btn:hover,
.twitter-btn:hover,
.arxiv-btn:hover {
  background: #f7fafc;
}

.container {
  padding: 3rem 1rem;
  margin: auto;
  max-width: 1240px;
  width: 100%;
}

#app {
  position: relative;
  overflow: visible;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0;
}

/* Parameter Controls */
.parameter-controls {
  background: white;
  border-radius: 4px;
  border: 1px solid #e2e8f0;
  padding: 24px 32px;
  margin: 20px 0;
  display: flex;
  gap: 48px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

.param-group {
  display: flex;
  gap: 32px;
  align-items: center;
}

.param-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 200px;
}

.param-label {
  font-weight: 400;
  color: #2d3748;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.param-label > span:not(.tooltip-icon) {
  color: #2d3748;
  font-weight: 500;
  background: #f7fafc;
  padding: 2px 8px;
  border-radius: 3px;
  min-width: 40px;
  text-align: center;
  border: 1px solid #e2e8f0;
}

/* Tooltip styling */
.tooltip-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #e2e8f0;
  color: #4a5568;
  font-size: 0.7rem;
  font-weight: 600;
  cursor: help;
  position: relative;
  transition: all 0.2s ease;
  margin-left: 4px;
}

.tooltip-icon:hover {
  background: #cbd5e0;
  color: #2d3748;
}

.tooltip-icon::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  background: #1a202c;
  color: white;
  padding: 10px 14px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 400;
  line-height: 1.5;
  white-space: normal;
  width: 260px;
  max-width: 90vw;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  pointer-events: none;
  z-index: 1000;
  text-align: left;
}

.tooltip-icon::before {
  content: '';
  position: absolute;
  bottom: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: #1a202c;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  pointer-events: none;
  z-index: 1000;
}

.tooltip-icon:hover::after,
.tooltip-icon:hover::before {
  opacity: 1;
  visibility: visible;
}

.param-slider {
  width: 100% !important;
  height: 2px !important;
  -webkit-appearance: none;
  appearance: none;
  background: #cbd5e0;
  border-radius: 1px;
  outline: none;
  transition: background 0.2s;
}

.param-slider:hover {
  background: #a0aec0;
}

.param-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: #2d3748;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.2s;
}

.param-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  background: #1a202c;
}

.param-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: #2d3748;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.2s;
}

.param-slider::-moz-range-thumb:hover {
  transform: scale(1.15);
  background: #1a202c;
}

.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.param-checkbox {
  display: flex !important;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: #4a5568;
  cursor: pointer;
  user-select: none;
  font-weight: 300;
}

.param-checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: #2d3748;
  border-radius: 3px;
}

.param-checkbox:hover {
  color: #2d3748;
}

.param-checkbox label {
  cursor: pointer;
  font-weight: 300;
}

.instructions {
  margin: 48px auto;
  padding: 32px;
  background: white;
  border-radius: 4px;
  border: 1px solid #e2e8f0;
  max-width: 1240px;
}

.instructions h2 {
  color: #1a202c;
  margin-bottom: 16px;
  font-weight: 300;
  font-size: 1.5rem;
}

.instructions h3 {
  color: #2d3748;
  margin: 24px 0 12px 0;
  font-weight: 400;
  font-size: 1rem;
  letter-spacing: 0.01em;
}

.instructions ul, .instructions ol {
  margin-left: 20px;
  color: #4a5568;
}

.instructions li {
  margin: 8px 0;
  line-height: 1.7;
  font-weight: 300;
}

.instructions strong {
  color: #2d3748;
  font-weight: 500;
  background: #f7fafc;
  padding: 2px 6px;
  border-radius: 3px;
  border: 1px solid #e2e8f0;
}

/* Canvas Wrapper */
#canvas-wrapper {
  margin: 40px auto 50px;
  max-width: 1240px;
  padding: 0 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.canvas-title {
  font-size: 1.1rem;
  font-weight: 400;
  color: #2d3748;
  margin: 0;
  letter-spacing: 0;
}

#app {
  position: relative;
  width: 100%;
  max-width: 1240px;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

#loading-indicator {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1000;
  background: rgba(250, 250, 250, 0.95);
  padding: 24px 32px;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid #e2e8f0;
  border-top-color: #2d3748;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-text {
  color: #2d3748;
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}

canvas {
  border: 1px solid #e2e8f0;
  display: block;
  border-radius: 4px;
  max-width: 1240px;
  height: 600px;
  background: white;
}

.canvas-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  width: 100%;
  max-width: 1240px;
  margin-top: 0;
}

.control-panel {
  background: white;
  border-radius: 4px;
  border: 1px solid #e2e8f0;
  padding: 0;
  display: flex;
  flex-direction: column;
  overflow: visible;
}

.panel-header {
  background: #fafafa;
  padding: 16px 20px;
  border-bottom: 1px solid #e2e8f0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-radius: 4px 4px 0 0;
}

.panel-subtitle {
  font-size: 0.75rem;
  font-weight: 500;
  color: #718096;
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.panel-content {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px;
  overflow: visible;
}

.control-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.graph-params {
  background: #f7fafc;
  padding: 12px;
  border-radius: 4px;
  border: 1px solid #e2e8f0;
  margin-top: 4px;
}

.sliders-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  align-items: start;
}

.button-row {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

.checkbox-row {
  flex-direction: row;
  gap: 16px;
  margin-top: 4px;
}

.control-row label {
  font-weight: 400;
  color: #4a5568;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.control-row select {
  padding: 9px 36px 9px 12px;
  border-radius: 4px;
  border: 1px solid #cbd5e0;
  background: white;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 400;
  color: #2d3748;
  cursor: pointer;
  transition: all 150ms ease;
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 14px;
  width: 100%;
}

.control-row select:hover {
  border-color: #a0aec0;
}

.control-row select:focus {
  outline: none;
  border-color: #718096;
}

.control-row button {
  -webkit-appearance: none;
  appearance: none;
  border: 1px solid #e2e8f0;
  border-radius: 4px;
  padding: 10px 18px;
  font-family: inherit;
  font-weight: 400;
  font-size: 0.875rem;
  letter-spacing: 0;
  cursor: pointer;
  transition: all 150ms ease;
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  flex: 1;
  min-width: fit-content;
  background: white;
  color: #2d3748;
}

.control-row button:hover {
  background: #f7fafc;
  border-color: #cbd5e0;
}

.control-row button:active {
  background: #edf2f7;
}

/* All buttons get same minimal style */
#btn-export-pattern,
#btn-export-graph,
#btn-load-graph {
  background: white;
  color: #2d3748;
  border: 1px solid #e2e8f0;
}

#btn-export-pattern:hover,
#btn-export-graph:hover,
#btn-load-graph:hover {
  background: #f7fafc;
  border-color: #cbd5e0;
}

#btn-export-pattern:active,
#btn-export-graph:active,
#btn-load-graph:active {
  background: #edf2f7;
}

.control-row button:focus {
  outline: none;
  border-color: #a0aec0;
}

/* Responsive adjustments */
@media (max-width: 1100px) {
  .container {
    max-width: 95%;
  }

  h1 {
    font-size: 2rem;
  }

  .subtitle {
    font-size: 0.95rem;
    padding: 0 10px;
  }

  .link-buttons {
    gap: 10px;
  }

  .link-btn {
    min-width: 120px;
    padding: 9px 18px;
    font-size: 0.875rem;
  }

  .parameter-controls {
    flex-direction: column;
    gap: 24px;
  }

  .param-group {
    flex-direction: column;
    width: 100%;
  }

  .param-item {
    width: 100%;
  }
}

@media (max-width: 1100px) {
  #canvas-wrapper {
    margin: 30px auto 40px;
  }

  .canvas-controls {
    grid-template-columns: 1fr;
    gap: 20px;
    margin-top: 12px;
  }

  .panel-header {
    padding: 16px 18px;
  }

  .panel-content {
    padding: 18px;
  }

  #app {
    max-width: 100%;
    margin-bottom: 16px;
  }

  .instructions {
    max-width: 100%;
    margin: 30px 0;
  }

  canvas {
    max-width: 100%;
    width: 100%;
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 1.75rem;
  }

  .subtitle {
    font-size: 0.9rem;
    margin-bottom: 24px;
    padding: 0 15px;
  }

  .link-buttons {
    gap: 8px;
    padding: 0 10px;
  }

  .link-btn {
    min-width: 100px;
    padding: 8px 14px;
    font-size: 0.85rem;
  }

  .btn-icon {
    font-size: 0.95rem;
  }

  #canvas-wrapper {
    padding: 0 10px;
    margin: 24px auto 32px;
    gap: 12px;
  }

  .canvas-title {
    font-size: 1rem;
  }

  .panel-header {
    padding: 14px 16px;
  }

  .panel-subtitle {
    font-size: 0.7rem;
  }

  .panel-content {
    padding: 16px;
  }

  .sliders-row {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .button-row {
    flex-direction: column;
  }

  .control-row button {
    width: 100%;
  }

  .checkbox-row {
    flex-direction: column;
    gap: 10px;
  }

  #app {
    width: 100%;
    height: auto;
    aspect-ratio: 2/1;
    max-width: 100%;
    margin-bottom: 14px;
  }

  .instructions {
    margin: 24px 0;
    padding: 20px;
  }

  canvas {
    max-width: 100%;
    width: 100%;
    height: auto !important;
  }

  .canvas-controls {
    gap: 16px;
    margin-top: 8px;
  }
}