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

:root {
  --bg-primary: #fafafa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f5f5f5;
  --text-primary: #171717;
  --text-secondary: #737373;
  --text-tertiary: #a3a3a3;
  --accent-primary: #525252;
  --accent-secondary: #404040;
  --border-color: #e5e5e5;
  --success: #34c759;
  --danger: #ff3b30;
  --warning: #ff9500;
  --canvas-bg: #ffffff;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #171717;
    --bg-tertiary: #262626;
    --text-primary: #fafafa;
    --text-secondary: #a3a3a3;
    --text-tertiary: #737373;
    --accent-primary: #a3a3a3;
    --accent-secondary: #d4d4d4;
    --border-color: #262626;
    --success: #32d74b;
    --danger: #ff453a;
    --warning: #ff9f0a;
    --canvas-bg: #000000;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.4);
  }
}

body {
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    Arial,
    sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
}

.container {
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.sidebar {
  width: 400px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  padding: 24px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar h2 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.sidebar h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.functions-panel {
  flex: 1;
}

#functions-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
  max-height: 400px;
  overflow-y: auto;
}

.function-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: all 0.15s ease;
}

.function-item:hover {
  border-color: var(--text-tertiary);
}

.function-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.function-color {
  width: 20px;
  height: 20px;
  border-radius: 3px;
  cursor: pointer;
  border: 1.5px solid var(--border-color);
  flex-shrink: 0;
}

.function-input {
  flex: 1;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 8px 10px;
  color: var(--text-primary);
  font-family:
    "SF Mono", "Monaco", "Inconsolata", "Fira Code", "Droid Sans Mono",
    "Source Code Pro", monospace;
  font-size: 0.875rem;
  transition: all 0.15s ease;
}

.function-input:focus {
  outline: none;
  border-color: var(--text-secondary);
  background: var(--bg-primary);
}

.function-controls {
  display: flex;
  gap: 8px;
}

.btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8125rem;
  font-weight: 500;
  transition: all 0.15s ease;
}

.btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--text-tertiary);
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--text-primary);
  border-color: var(--text-primary);
  color: var(--bg-secondary);
  width: 100%;
  padding: 10px 16px;
  font-weight: 600;
}

.btn-primary:hover {
  color: var(--text-primary);
  border-color: var(--accent-secondary);
}

.btn-small {
  padding: 5px 10px;
  font-size: 0.75rem;
}

.btn-danger {
  color: var(--danger);
  border-color: var(--border-color);
  background: var(--bg-secondary);
}

.btn-danger:hover {
  background: var(--danger);
  border-color: var(--danger);
  color: white;
}

.controls-panel,
.legend-panel,
.asymptotes-panel {
  background: var(--bg-primary);
  padding: 16px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.asymptotes-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.asymptote-group {
  border-left: 2px solid var(--border-color);
  padding-left: 12px;
}

.asymptote-group-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.asymptote-values {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.asymptote-value {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-family: "SF Mono", "Monaco", "Inconsolata", "Fira Code", monospace;
  padding: 4px 8px;
  background: var(--bg-secondary);
  border-radius: 3px;
  border: 1px solid var(--border-color);
}

.asymptotes-list:empty::before {
  content: "No asymptotes detected";
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-style: italic;
}

.control-group {
  margin-bottom: 16px;
}

.control-group:last-child {
  margin-bottom: 0;
}

.control-group label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
}

.control-group input[type="number"] {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 6px 8px;
  color: var(--text-primary);
  width: 70px;
  margin: 0 4px;
  transition: all 0.15s ease;
  font-size: 0.875rem;
}

.control-group input[type="number"]:focus {
  outline: none;
  border-color: var(--text-secondary);
  background: var(--bg-primary);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.legend-item:last-child {
  margin-bottom: 0;
}

.legend-color {
  width: 16px;
  height: 16px;
  border-radius: 2px;
  border: 1.5px solid var(--border-color);
  flex-shrink: 0;
}

.graph-container {
  flex: 1;
  position: relative;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

#graph-canvas {
  background: var(--canvas-bg);
  border: 1px solid var(--border-color);
  cursor: crosshair;
  box-shadow: var(--shadow-md);
  max-width: calc(100vw - 400px);
}

.tooltip {
  position: absolute;
  background: var(--text-primary);
  color: var(--bg-secondary);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.8125rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  pointer-events: none;
  display: none;
  z-index: 1000;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--text-primary);
}

.tooltip.show {
  display: block;
}

.function-info {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  min-height: 20px;
}
.info-text {
  display: flex;
  gap: 3px;
}

.info-badge {
  background: var(--bg-tertiary);
  padding: 3px 8px;
  border-radius: 3px;
  font-size: 0.6875rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
}

.info-badge.asymptote {
  border-color: var(--danger);
  transition: all 0.15s ease;
}

.info-badge.asymptote:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(255, 59, 48, 0.2);
}

.info-badge.hole {
  border-color: var(--warning);
  transition: all 0.15s ease;
}

.info-badge.hole:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(255, 149, 0, 0.2);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* Responsive design */
@media (max-width: 768px) {
  .main-content {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    max-height: 40vh;
  }
  #graph-canvas {
    max-width: unset;
  }
}