/* === Global Styles & Resets === */
:root {
    /* Color Palette */
    --primary-color: #0d6efd;
    --primary-hover-color: #0b5ed7;
    --secondary-color: #6c757d;
    --secondary-hover-color: #5c636a;
    --success-color: #198754;
    --success-hover-color: #157347;
    --danger-color: #dc3545;
    --danger-hover-color: #c82333;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --header-bg: #343a40;
    --border-color: #dee2e6;
    --border-light-color: #e9ecef;
    --text-color: #212529;
    --text-muted-color: #6c757d;
    --error-bg-color: #f8d7da;
    --error-text-color: #721c24;
    --error-border-color: #f5c6cb;
    --focus-shadow-color: rgba(13, 110, 253, 0.25);

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;

    /* Borders */
    --border-radius: 4px;
    --border-width: 1px;
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Meiryo, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--light-color);
    color: var(--text-color);
    font-size: 14px;
    line-height: 1.5;
}

h1, h2, h3, p, button, input, select, label, textarea {
    margin: 0;
    padding: 0;
    font-family: inherit;
    font-size: inherit;
}

/* === Header === */
header {
    background-color: var(--header-bg);
    color: white;
    padding: var(--space-sm) var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

header h1 {
    font-size: 1.4rem;
    font-weight: 500;
    white-space: nowrap;
}

.header-controls {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
    flex-wrap: wrap;
}

/* === Main Content Area === */
main {
    flex-grow: 1;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* === Table Controls === */
.table-controls {
    margin-bottom: var(--space-md);
    display: flex;
    gap: var(--space-sm);
    align-items: center;
    flex-wrap: wrap;
}

#filterInput {
    min-width: 200px;
    flex-grow: 1;
}

/* === Table === */
.table-container {
    flex-grow: 1;
    overflow: auto;
    border: var(--border-width) solid var(--border-color);
    background-color: white;
    border-radius: var(--border-radius);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    border: var(--border-width) solid var(--border-light-color);
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    white-space: nowrap;
    vertical-align: middle;
}
td.placeholder-cell {
    text-align: center;
    padding: var(--space-xl);
    color: var(--text-muted-color);
}
td.placeholder-cell.error-cell { /* Style for error placeholder */
    color: var(--danger-color);
    font-weight: 500;
}


thead th {
    background-color: var(--light-color);
    position: sticky;
    top: 0;
    z-index: 10;
    font-weight: 600;
    border-bottom: calc(var(--border-width) * 2) solid var(--border-color);
}

thead th.sortable {
    cursor: pointer;
}
thead th.sortable:hover {
    background-color: var(--border-light-color);
}

thead th .sort-icon {
    font-size: 0.8em;
    margin-left: var(--space-xs);
    color: var(--text-muted-color);
    display: inline-block;
    width: 1em;
    text-align: center;
    opacity: 0.7;
}
thead th.sortable:hover .sort-icon {
    opacity: 1;
}

tbody tr:nth-child(even) {
    background-color: var(--light-color);
}
tbody tr:hover {
    background-color: var(--border-light-color);
}

/* Highlighted Error Row */
tbody tr.highlight-error {
    background-color: var(--error-bg-color) !important; /* Ensure override */
    color: var(--error-text-color);
}
tbody tr.highlight-error td {
    border-color: var(--error-border-color);
}
tbody tr.highlight-error input,
tbody tr.highlight-error select {
    border-color: var(--danger-color) !important; /* Important to override focus */
    background-color: #fff; /* Keep input background white */
}
/* Specific cell highlight for non-input errors */
td.cell-error {
    background-color: #ffeeee !important;
}


/* Table Input Elements */
tbody td input[type="text"],
tbody td input[type="number"],
tbody td select {
    width: 100%;
    padding: var(--space-xs) var(--space-sm);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: inherit;
    background-color: #fff;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}
tbody td input:focus,
tbody td select:focus {
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 0.2rem var(--focus-shadow-color);
}
/* Error state for input/select within cell */
tbody td input.input-error,
tbody td select.input-error {
    border-color: var(--danger-color) !important;
}


/* Checkbox & Action Cells */
.checkbox-cell {
    width: 45px;
    text-align: center;
    padding-left: var(--space-sm) !important;
    padding-right: var(--space-sm) !important;
}
.checkbox-cell input {
    cursor: pointer;
    width: 1em;
    height: 1em;
    vertical-align: middle;
}

.action-cell {
    width: 60px;
    text-align: center;
}
.small-button {
    padding: 0.2rem 0.5rem;
    font-size: 0.8rem;
    background-color: var(--danger-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.2s;
}
.small-button:hover:not(:disabled) { /* Added :not(:disabled) */
    background-color: var(--danger-hover-color);
}
.small-button:disabled { /* Added disabled style */
    opacity: 0.65;
    cursor: not-allowed;
}


/* === Footer === */
footer {
    background-color: var(--border-light-color);
    padding: var(--space-sm) var(--space-lg);
    border-top: var(--border-width) solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

footer .history-controls,
footer .output-controls {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
}
footer label {
    margin-right: var(--space-xs);
    font-weight: 500;
}

/* === Buttons === */
.button {
    padding: var(--space-sm) var(--space-md);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background-color 0.2s ease-in-out, opacity 0.2s, box-shadow 0.15s ease-in-out;
    white-space: nowrap;
    text-align: center;
    color: white; /* Default text color */
    background-color: var(--secondary-color); /* Default background */
}
.button:hover:not(:disabled) {
    background-color: var(--secondary-hover-color);
}
.button:focus {
    outline: 0;
    box-shadow: 0 0 0 0.2rem var(--focus-shadow-color);
}

/* Button Variants */
.button.primary-action { background-color: var(--primary-color); }
.button.primary-action:hover:not(:disabled) { background-color: var(--primary-hover-color); }
.button.success { background-color: var(--success-color); }
.button.success:hover:not(:disabled) { background-color: var(--success-hover-color); }
.button.danger { background-color: var(--danger-color); }
.button.danger:hover:not(:disabled) { background-color: var(--danger-hover-color); }
.button.secondary { background-color: var(--secondary-color); }
.button.secondary:hover:not(:disabled) { background-color: var(--secondary-hover-color); }

.button:disabled, .button.disabled {
    background-color: var(--secondary-color);
    cursor: not-allowed;
    opacity: 0.65;
}

/* File Input Label as Button */
.file-label.button {
    display: inline-block;
    background-color: var(--primary-color);
}
.file-label.button:hover:not(.disabled) {
    background-color: var(--primary-hover-color);
}

/* Full Width Button */
.button.full-width {
    display: block;
    width: 100%;
}

/* === Inputs & Selects (Outside Table) === */
input[type="text"], select, textarea {
    padding: var(--space-sm) var(--space-md);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    background-color: #fff;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    width: 100%; /* Default to full width for inputs */
}
input[type="text"]:focus, select:focus, textarea:focus {
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 0.2rem var(--focus-shadow-color);
}

select {
     cursor: pointer;
     appearance: none;
     -webkit-appearance: none;
     background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e");
     background-repeat: no-repeat;
     background-position: right var(--space-md) center;
     background-size: 16px 12px;
     padding-right: calc(var(--space-md) * 2.5); /* Space for arrow */
}
/* Ensure filter input doesn't take full width in its flex container */
#filterInput {
    width: auto;
    min-width: 200px;
}

/* === Loading Indicator === */
.loading-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1050;
    flex-direction: column;
    gap: var(--space-md);
    color: var(--dark-color);
    font-weight: 500;
}

.spinner {
    border: 4px solid var(--border-light-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* === Modal Styles === */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.6); /* Slightly darker overlay */
    animation: modalFadeIn 0.3s ease-out;
}

.modal-content {
    background-color: #fff;
    margin: 8% auto;
    padding: var(--space-lg) var(--space-xl);
    border: none;
    width: 90%;
    max-width: 500px;
    border-radius: 8px;
    position: relative;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    animation: modalSlideIn 0.3s ease-out;
}
.modal-content.large {
    max-width: 800px;
}
/* History modal specific width */
#historyModal .modal-content {
    max-width: 1000px;
}


@keyframes modalFadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes modalSlideIn { from { transform: translateY(-30px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

.close-button {
    color: var(--text-muted-color);
    position: absolute;
    top: var(--space-sm);
    right: var(--space-md);
    font-size: 1.8rem;
    font-weight: bold;
    line-height: 1;
    cursor: pointer;
    transition: color 0.2s;
    padding: var(--space-xs); /* Easier to click */
}
.close-button:hover, .close-button:focus {
    color: var(--dark-color);
    text-decoration: none;
}

.modal h2 {
    margin-top: 0;
    margin-bottom: var(--space-lg);
    font-size: 1.25rem;
    font-weight: 500;
    border-bottom: var(--border-width) solid var(--border-color);
    padding-bottom: var(--space-sm);
}

/* Modal Form Elements */
.modal label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 500;
}
.modal select,
.modal input[type="text"],
.modal textarea {
    width: 100%;
    margin-bottom: var(--space-md);
}
.modal .button.modal-action-button { /* Button inside modal footer area */
    display: block;
    width: auto; /* Auto width */
    margin-left: auto; /* Align button to right */
    min-width: 100px;
}

/* File Load Modal */
#fileLoadModal .modal-form-step {
    margin-bottom: var(--space-md);
}
#fileLoadModal #modalFileLabel {
    width: 100%;
    display: block;
    text-align: center;
}
#fileLoadModal #startLoadButton {
    margin-top: var(--space-lg);
}
#fileLoadModal .note {
    font-size: 0.8em;
    color: var(--text-muted-color);
    margin-top: var(--space-xs);
    text-align: left; /* Align note text left */
}
.selected-file-name {
    display: block;
    margin-top: var(--space-sm);
    font-size: 0.85em;
    color: var(--text-muted-color);
    text-align: center;
    word-break: break-all;
    min-height: 1.2em; /* Reserve space even when empty */
}

/* Edit Modal - Input/Select Toggle */
#editModal #bulkEditSelectValue {
    /* Initially hidden, shown by JS when needed */
    display: none;
}


/* Master Management Modal */
.master-section {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: var(--border-width) solid var(--border-light-color);
}
.master-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}
.master-section h3 {
    margin-bottom: var(--space-sm);
    font-size: 1.1rem;
    font-weight: 500;
    color: #495057;
}
.master-section textarea {
    margin-bottom: var(--space-sm);
    font-family: Consolas, 'Courier New', monospace;
    min-height: 80px;
    line-height: 1.4;
}
.master-section .note {
    font-size: 0.85em;
    color: var(--text-muted-color);
    margin-top: var(--space-xs);
}

/* Manual Modal Content */
#manualContent {
    max-height: 65vh;
    overflow-y: auto;
    margin-top: var(--space-md);
    padding: var(--space-md);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--light-color);
    line-height: 1.6;
}
#manualContent h2, #manualContent h3 {
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
    font-weight: 600;
}
#manualContent ol, #manualContent ul {
    padding-left: var(--space-lg);
    margin-bottom: var(--space-md);
}
#manualContent code {
    background-color: var(--border-light-color);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-family: Consolas, 'Courier New', monospace;
}
#manualContent strong { font-weight: 600; }
#manualContent iframe {
    width: 100%;
    height: 60vh;
    border: none;
    border-radius: var(--border-radius);
}

/* History Modal Table */
.history-table-container {
    max-height: 60vh;
    overflow-y: auto;
    border: var(--border-width) solid var(--border-color);
    margin-bottom: var(--space-md);
}
#historyTable {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85em;
}
#historyTable th, #historyTable td {
    border: var(--border-width) solid var(--border-light-color);
    padding: var(--space-xs) var(--space-sm);
    text-align: left;
    vertical-align: top;
    white-space: normal; /* Allow wrap */
}
#historyTable thead th {
    background-color: var(--light-color);
    position: sticky;
    top: 0;
    font-weight: 600;
}
/* History Column Widths (Adjust as needed) */
#historyTable th:nth-child(1) { width: 130px; } /* Timestamp */
#historyTable th:nth-child(2) { width: 80px; }  /* Worker */
#historyTable th:nth-child(3) { width: 120px; } /* Operation */
#historyTable th:nth-child(4) { width: 150px; } /* Target */
#historyTable th:nth-child(5),
#historyTable th:nth-child(6) { width: auto; }  /* Old/New Value */

#historyTable tbody tr:nth-child(even) {
    background-color: var(--light-color);
}
.history-actions {
    text-align: right;
    margin-top: var(--space-md);
}

/* === Toast Notifications === */
.toast-container {
    position: fixed; /* Stay in place */
    bottom: var(--space-lg); /* Position at bottom */
    right: var(--space-lg);  /* Position at right */
    z-index: 1060; /* High z-index to appear above most elements */
    display: flex;
    flex-direction: column; /* Stack toasts vertically */
    align-items: flex-end; /* Align toasts to the right */
    gap: var(--space-sm); /* Spacing between toasts */
}

.toast {
    background-color: rgba(52, 58, 64, 0.9); /* Dark semi-transparent background */
    color: white;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--border-radius);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
    opacity: 0; /* Start hidden */
    transform: translateY(20px); /* Start slightly lower */
    transition: opacity 0.3s ease-out, transform 0.3s ease-out;
    max-width: 350px; /* Limit width */
    word-wrap: break-word; /* Wrap long messages */
    cursor: pointer; /* Allow clicking to dismiss */
    font-size: 0.9rem;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* Optional: Different toast types */
.toast.success {
    background-color: rgba(25, 135, 84, 0.9); /* Success green */
}
.toast.error {
    background-color: rgba(220, 53, 69, 0.9); /* Danger red */
}
.toast.warning {
     background-color: rgba(255, 193, 7, 0.9); /* Warning yellow */
     color: #333; /* Darker text for yellow */
}
.toast.info {
     background-color: rgba(13, 202, 240, 0.9); /* Info cyan */
      color: #333; /* Darker text for cyan */
}