:root {
    /* Light mode colors */
    --bg-color: #ffffff;
    --text-color: #000000;
    --toolbar-bg: #f3f3f3;
    --toolbar-border: #ccc;
    --cell-border: #ccc;
    --cell-bg: #ffffff;
    --cell-focus-border: #4a90e2;
    --cell-focus-bg: #e8f0fe;
    --button-bg: #ffffff;
    --button-border: #bbb;
    --button-hover-bg: #d9d9d9;
    --toolbar-height: 48px;
}

/* Dark mode overrides */
[data-theme="dark"] {
    --bg-color: #1e1e1e;
    --text-color: #e0e0e0;
    --toolbar-bg: #2b2b2b;
    --toolbar-border: #444;
    --cell-border: #555;
    --cell-bg: #2a2a2a;
    --cell-focus-border: #7aa2f7;
    --cell-focus-bg: #3b4252;
    --button-bg: #333;
    --button-border: #666;
    --button-hover-bg: #1a1a1a;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    overflow: hidden;
    background-color: var(--bg-color);
    color: var(--text-color);
}

#toolbar {
    display: flex;
    gap: 16px;
    padding: 8px;
    background: var(--toolbar-bg);
    border-bottom: 1px solid var(--toolbar-border);
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 10;
    min-height: var(--toolbar-height);
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 6px;
    border-right: 1px solid var(--toolbar-border);
    padding-right: 10px;
    flex-direction: column;
    flex-wrap: nowrap;
}

.toolbar-action-group {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-direction: row;
    flex-wrap: wrap;
}

.group-label {
    font-size: 12px;
    font-weight: bold;
    color: var(--text-color);
    opacity: 0.7;
    margin-right: 4px;
}

#toolbar button {
    border: 1px solid var(--button-border);
    background: var(--button-bg);
    cursor: pointer;
    padding: 4px 8px;
    font-weight: bold;
    color: var(--text-color);
    border-radius: 6px;
    transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
}

#toolbar button:hover {
    background: var(--button-hover-bg);
}

#toolbar button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--toolbar-bg);
    color: var(--text-color);
}

#toolbar input {
    border: 1px solid var(--button-border);
    background: var(--button-bg);
    cursor: pointer;
    padding: 4px 8px;
    font-weight: bold;
    color: var(--text-color);
    width: 2.3rem;
    border-radius: 6px;
}

#toolbar input:focus,
#toolbar input:focus-visible {
    background: var(--button-hover-bg);
    outline: none;
}

#toolbar input:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--toolbar-bg);
    color: var(--text-color);
}

.number-input-controls-container .arrow-btn-div {
    width: .8rem;
    height: .7rem;
    color: var(--text-color);
    background: var(--button-bg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--button-border);
}

.number-input-controls-container .arrow-btn-div:hover {
    background: var(--button-hover-bg);
}

.number-input-controls-container {
    width: 1rem;
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    align-items: center;
    margin-left: 2px;
}

.number-input-container {
    display: flex;
    flex-direction: row;
    align-items: center;
}

#toolbar select {
    border: 1px solid var(--button-border);
    background: var(--button-bg);
    cursor: pointer;
    padding: 4px 8px;
    font-weight: bold;
    color: var(--text-color);
    width: 4rem;
    border-radius: 6px;
}

#toolbar select:focus,
#toolbar select:focus-visible {
    background: var(--button-hover-bg);
    outline: none;
}

#toolbar select:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--toolbar-bg);
    color: var(--text-color);
}

#sheet-container {
    overflow: auto;
    height: calc(100vh - var(--toolbar-height) - var(--toolbar-height));
    background-color: var(--bg-color);
    padding-top: var(--toolbar-height);
}

table {
    border-collapse: collapse;
    margin-bottom: 2rem;
    width: max-content;
}

th,
td {
    border: 1px solid var(--cell-border);
    width: 80px;
    height: 25px;
    text-align: center;
    font-size: 14px;
    background-color: var(--cell-bg);
    color: var(--text-color);
}

th {
    position: sticky;
    top: 0;
    z-index: 5;
    background: var(--cell-bg);
    border: 1px solid var(--cell-border);
    height: 25px;
    font-weight: normal;
}

tr th:first-child {
    position: sticky;
    left: 0;
    z-index: 6;
    background: var(--cell-bg);
    border-right: 1px solid var(--cell-border);
}

td:first-child {
    position: sticky;
    left: 0;
    z-index: 4;
    background: var(--cell-bg);
}

tbody tr:nth-child(even) td {
    background-color: color-mix(in srgb, var(--cell-bg) 92%, var(--text-color));
}

td[contenteditable="true"]:focus {
    outline: 2px solid var(--cell-focus-border);
    background: var(--cell-focus-bg);
}

/* Minor layout polish for toolbar groups */
.toolbar-group {
    gap: 8px;
}

.toolbar-action-group {
    gap: 8px;
}