:root {
  /* QuantDash Colors based on 'Obsidian Lens' */
  --surface: #131313;
  --surface-lowest: #0e0e0e;
  --surface-container: #201f1f;
  --surface-container-high: #2a2a2a;
  
  --primary: #00d4aa; /* Teal */
  --on-primary: #000000;
  
  --on-surface: #e5e2e1;
  --on-surface-variant: #bacac2;
  
  --outline: #85948d;
  --outline-variant: #3b4a44;
  
  --error: #ffb4ab;
  --error-container: #93000a;
  --on-error-container: #ffdad6;
  
  /* Utilities mapped */
  --bg-surface: var(--surface);
  --bg-surface-lowest: var(--surface-lowest);
  --bg-surface-container: var(--surface-container);
  --bg-surface-container-high: var(--surface-container-high);
  
  --bg-primary: var(--primary);
  --text-on-primary: var(--on-primary);
  
  --text-primary: var(--primary);
  --text-on-surface: var(--on-surface);
  --text-on-surface-variant: var(--on-surface-variant);
  
  --border-outline-variant: var(--outline-variant);
}

body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--surface);
    color: var(--on-surface);
}

.font-inter { font-family: 'Inter', sans-serif; }
.font-jetbrains { font-family: 'JetBrains Mono', monospace; }

/* Emulate basic Tailwind classes used in HTML */
.bg-surface { background-color: var(--surface); }
.bg-surface-lowest { background-color: var(--surface-lowest); }
.bg-surface-container { background-color: var(--surface-container); }
.bg-surface-container-high { background-color: var(--surface-container-high); }
.bg-primary { background-color: var(--primary); }
.bg-error-container { background-color: var(--error-container); }

.text-primary { color: var(--primary); }
.text-on-primary { color: var(--on-primary); }
.text-on-surface { color: var(--on-surface); }
.text-on-surface-variant { color: var(--on-surface-variant); }
.text-on-error-container { color: var(--on-error-container); }

.text-data-lg {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.125rem;
    font-weight: 500;
}
.text-label-caps {
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 700;
}

.border { border-width: 1px; border-style: solid; }
.border-b { border-bottom-width: 1px; border-bottom-style: solid; }
.border-l { border-left-width: 1px; border-left-style: solid; }
.border-outline-variant { border-color: var(--outline-variant); }

/* Layout utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-4 { gap: 1rem; }
.flex-1 { flex: 1 1 0%; }
.h-screen { height: 100vh; }
.min-h-screen { min-height: 100vh; }
.w-full { width: 100%; }
.max-w-sm { max-width: 24rem; }
.w-80 { width: 20rem; }
.p-8 { padding: 2rem; }
.p-4 { padding: 1rem; }
.p-3 { padding: 0.75rem; }
.p-2 { padding: 0.5rem; }
.p-1 { padding: 0.25rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-1 { padding-top: 0.25rem; padding-bottom: 0.25rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }

/* Text utilities */
.text-center { text-align: center; }
.text-2xl { font-size: 1.5rem; line-height: 2rem; }
.text-xl { font-size: 1.25rem; line-height: 1.75rem; }
.text-lg { font-size: 1.125rem; line-height: 1.75rem; }
.text-sm { font-size: 0.875rem; line-height: 1.25rem; }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.block { display: block; }
.hidden { display: none; }
.overflow-hidden { overflow: hidden; }
.overflow-y-auto { overflow-y: auto; }
.relative { position: relative; }
.rounded { border-radius: 0.25rem; }

/* Interactions */
.transition-colors { transition-property: color, background-color, border-color, text-decoration-color, fill, stroke; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.hover\:bg-surface-variant:hover { background-color: var(--surface-container-high); }
.hover\:opacity-90:hover { opacity: 0.9; }
.hover\:text-on-surface:hover { color: var(--on-surface); }
.focus\:border-primary:focus { border-color: var(--primary); }
.focus\:outline-none:focus { outline: 2px solid transparent; outline-offset: 2px; }

/* Heatmap Tooltip */
.d3-tooltip {
    position: absolute;
    text-align: left;
    padding: 0.75rem;
    font: 12px 'Inter', sans-serif;
    background: var(--surface-container-high);
    color: var(--on-surface);
    border: 1px solid var(--outline-variant);
    border-radius: 4px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 10;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
}