:root {
    /* Base UI Colors */
    --bg-main: #fcfcfc;
    --text-main: #2b2b2b;
    --text-muted: #6e6e6e;
    --border-light: #e0e0e0;
    --row-hover: #f4f4f5;
    --link-color: #0056b3;
    --font-ui: system-ui, -apple-system, sans-serif;
    --link-color: #0056b3;
    --table-bg: #ffffff;
    --table-row-alt: #f9f9f9;
    --table-border: #dddddd;
    --header-bg: #ffffff;
    
    /* Subtle Utility Colors for Category Theming */
    --cat-new-bg: #e3f2fd;
    --cat-above-max-bg: #e8f5e9;
    --cat-above-avg-bg: #f1f8e9;
    --cat-below-avg-bg: #ffebee;
    --cat-low-data-bg: #fff3e0;
    --cat-min-bid-bg: #f3e5f5;
    --cat-generic-bg: #f8f9fa; /* For custom search term categories */
}

/* Dark Theme Variables */
[data-theme="dark"] {
  --bg-main: #121212;
  --text-main: #e0e0e0;
  --text-muted: #6e6e6e;
  --link-color: #66b3ff;
  --table-bg: #1e1e1e;
  --table-row-alt: #2a2a2a;
  --table-border: #444444;
  --header-bg: #1a1a1a;
}

body {
    font-family: var(--font-ui);
    background-color: var(--bg-main);
    color: var(--text-main);
    margin: 0;
    padding: 20px;
    line-height: 1.5;
    transition: background-color 0.3s ease, color 0.3 ease;
}

a {
    color: var(--link-color);
}

table {
    background-color: var(--table-bg);
    border-collapse: collapse;
}

th, td {
    border: 1px solid var(--table-border);
}

th {
    background-color: var(--header-bg);
}

#theme-toggle {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  transition: background-color 0.2s ease;
}

#theme-toggle:hover {
  background-color: rgba(128, 128, 128, 0.2);
}
/* --- Search Toolbar --- */
.toolbar {
    margin-bottom: 1.5rem;
    position: sticky;
    top: 0;
    background: var(--bg-main);
    padding: 10px 0;
    z-index: 100;
}

#global-search {
    width: 100%;
    max-width: 400px;
    padding: 8px 12px;
    border: 1px solid var(--border-light);
    border-radius: 4px;
    font-size: 1rem;
}

/* --- Structural Blocks --- */
.category-block {
    margin-bottom: 2.5rem;
}

.category-block h2 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    padding-bottom: 0.25rem;
    border-bottom: 2px solid var(--border-light);
}

.table-container {
    /* OPTION A: overflow-x removed so the sticky context is the window, not the container */
    border: 1px solid var(--border-light);
    border-radius: 4px;
    background-color: #fff;
}

/* --- Data Table --- */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th, .data-table td {
    padding: 8px 12px;
    text-align: left;
}

.data-table td {
    border-bottom: 1px solid var(--border-light);
}

/* Monospace for numeric columns to ensure vertical alignment of digits */
.data-table td:nth-child(n+3):nth-child(-n+9) {
    font-family: 'Courier New', Courier, monospace;
}

/* --- Sticky Headers (Option A Fixes) --- */
.data-table th {
    position: sticky;
    
    /* Offset clears the height of the sticky .toolbar (43px input + 20px padding) */
    top: 63px; 
    
    z-index: 10;
    user-select: none;
    border-bottom: none; /* Prevent double borders */
    
    /* Enforce borders safely in sticky context so they don't visually detach */
    box-shadow: inset 0 -1px 0 var(--border-light), inset 0 1px 0 var(--border-light); 
}

.data-table th.sortable {
    cursor: pointer;
}

.data-table th.sortable:hover {
    /* Darkens the header slightly on hover, regardless of its category color */
    filter: brightness(0.95);
}

/* Sorting Indicators */
.data-table th.sortable::after {
    content: '\21D5'; /* Up/Down arrow */
    margin-left: 5px;
    opacity: 0.3;
}
.data-table th.sortable.asc::after { content: '\2191'; opacity: 1; }
.data-table th.sortable.desc::after { content: '\2193'; opacity: 1; }

.data-table tbody tr:hover {
    background-color: var(--row-hover);
}

.data-table a {
    color: var(--link-color);
    text-decoration: none;
}
.data-table a:hover {
    text-decoration: underline;
}

/* --- Thematic Category Coloring --- 
.cat-new h2 { border-color: var(--cat-new-bg); }
.cat-new th { background-color: var(--cat-new-bg); }

.cat-above-max h2 { border-color: var(--cat-above-max-bg); }
.cat-above-max th { background-color: var(--cat-above-max-bg); }

.cat-above-avg h2 { border-color: var(--cat-above-avg-bg); }
.cat-above-avg th { background-color: var(--cat-above-avg-bg); }

.cat-below-avg h2 { border-color: var(--cat-below-avg-bg); }
.cat-below-avg th { background-color: var(--cat-below-avg-bg); }

.cat-low-data h2 { border-color: var(--cat-low-data-bg); }
.cat-low-data th { background-color: var(--cat-low-data-bg); }

.cat-min-bid h2 { border-color: var(--cat-min-bid-bg); }
.cat-min-bid th { background-color: var(--cat-min-bid-bg); }
*/