/* General Body Styles */
:root {
    --font-family: 'Vazirmatn', sans-serif;
    --transition-speed: 0.25s;
    --border-radius-sm: 5px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --table-zoom: 1;
    --highlight-color-rgb: 243, 156, 18;
}

.light-theme {
    --primary-bg: #f4f7fc;
    --secondary-bg: #ffffff;
    --header-bg: linear-gradient(135deg, #4a69bd, #1e3799);
    --sidebar-bg: #ffffff;
    --accent-color: #3c40c6;
    --accent-hover: #192a56;
    --text-primary: #1e272e;
    --text-secondary: #808e9b;
    --border-color: #e8eef3;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.07);
    --danger-color: #eb2f06;
    --success-color: #05c46b;
    --warning-color: #f39c12;
    --conflict-bg: #eb2f06;
    --conflict-text: #ffffff;
    --tooltip-bg: #1e272e;
    --tooltip-text: #ffffff;
    --locked-slot-bg: repeating-linear-gradient(45deg, #d1d8e0, #d1d8e0 5px, #e9ecef 5px, #e9ecef 10px);
    --table-header-bg: #f1f3f5;
    --table-row-hover: #f8f9fa;
    --field-color-opacity: 0.1;
    --day-separator-color: #b0bec5;
    --highlight-color: #f39c12;
}

.dark-theme {
    --primary-bg: #1e272e;
    --secondary-bg: #2d3436;
    --header-bg: linear-gradient(135deg, #2c3e50, #1B1464);
    --sidebar-bg: #2d3436;
    --accent-color: #82589f;
    --accent-hover: #6D214F;
    --text-primary: #dcdde1;
    --text-secondary: #a4a7ab;
    --border-color: #4a4a4a;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --danger-color: #ff6b6b;
    --success-color: #6ab04c;
    --warning-color: #f9ca24;
    --conflict-bg: #c0392b;
    --conflict-text: #ffffff;
    --tooltip-bg: #dcdde1;
    --tooltip-text: #1e272e;
    --locked-slot-bg: repeating-linear-gradient(45deg, #3a3a3a, #3a3a3a 5px, #4f4f4f 5px, #4f4f4f 10px);
    --table-header-bg: #3b3b3b;
    --table-row-hover: #3f3f3f;
    --field-color-opacity: 0.15;
    --day-separator-color: #546e7a;
    --highlight-color: #f9ca24;
}

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

body {
    font-family: var(--font-family);
    direction: rtl;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    margin: 0;
    font-size: 14px;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow: hidden; /* Prevent body scroll */
}

.hidden {
    display: none !important;
}

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

/* Header */
.app-header {
    background: var(--header-bg);
    color: #fff;
    padding: 0.75rem 1.5rem;
    box-shadow: var(--shadow);
    z-index: 100;
    flex-shrink: 0;
}

.header-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.header-title h1 {
    margin: 0;
    font-size: 1.4rem;
    font-weight: 500;
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.view-switcher,
.header-actions {
    display: flex;
    gap: 0.5rem;
}

.view-btn,
.action-btn,
.week-btn {
    padding: 0.5rem 1rem;
    font-family: var(--font-family);
    font-size: 0.9rem;
    color: #fff;
    background-color: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.view-btn:hover,
.action-btn:hover,
.week-btn:hover {
    background-color: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.view-btn.active,
.week-btn.active,
.action-btn.active {
    background-color: #fff;
    border-color: #fff;
    color: var(--accent-color);
    font-weight: bold;
}
.view-btn { padding: 0.5rem 0.75rem; } /* Make view switcher icons smaller */

.selector-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: rgba(0, 0, 0, 0.2);
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius-md);
}

#teacher-selector {
    background: transparent;
    color: #fff;
    border: none;
    font-family: var(--font-family);
    font-size: 1rem;
    padding: 0.2rem;
}

#teacher-selector option {
    background: #2d3748;
    color: #fff;
}

.zoom-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #fff;
}
#zoom-slider {
    width: 100px;
    cursor: pointer;
}

/* Main Content */
.main-content {
    display: flex;
    flex-grow: 1;
    overflow: hidden; /* Important for layout */
}

/* Sidebar */
.sidebar {
    width: 320px;
    flex-shrink: 0;
    background-color: var(--primary-bg);
    padding: 1rem;
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-speed);
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    gap: 1rem;
    overflow: hidden; /* Prevent its own scrollbar */
}

.sidebar-section {
    background: var(--secondary-bg);
    padding: 1rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    transition: all var(--transition-speed);
    overflow: hidden;
}

/* Allow sidebar sections to grow and shrink */
#unplaced-lessons-container, #teacher-load-container {
    flex-grow: 1;
    min-height: 150px;
    display: flex;
    flex-direction: column;
}

.sidebar-section.collapsed {
    flex-grow: 0;
    min-height: 50px; /* Height of the header */
    flex-shrink: 1;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-color);
    flex-shrink: 0;
}

.section-header.collapsible {
    cursor: pointer;
    margin-bottom: 0;
    padding-bottom: 0.75rem;
    transition: margin-bottom 0.3s ease;
}

.sidebar-section.collapsed .section-header {
    margin-bottom: 0;
}

.section-header h2 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.collapse-icon {
    transition: transform 0.3s ease;
}
.sidebar-section.collapsed .collapse-icon {
    transform: rotate(-180deg);
}

.section-content {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    overflow: hidden;
    transition: opacity 0.3s ease, max-height 0.4s ease, padding 0.4s ease;
    max-height: 1000px; /* Arbitrary large number for open state */
    opacity: 1;
}
.sidebar-section.collapsed .section-content {
    max-height: 0;
    opacity: 0;
    padding-top: 0 !important;
    padding-bottom: 0 !important;
    margin-top: -1rem; /* Counteract header margin */
    pointer-events: none;
}
#unplaced-lessons-container .section-content {
    padding-top: 1rem; /* Add padding back */
}


.add-btn {
    background: none;
    border: none;
    color: var(--accent-color);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color var(--transition-speed);
}

.add-btn:hover {
    color: var(--accent-hover);
}

#lesson-search {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    margin-bottom: 1rem;
    font-family: var(--font-family);
    font-size: 0.9rem;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    flex-shrink: 0;
}

.item-list {
    overflow-y: auto;
    padding-right: 0.5rem;
    flex-grow: 1; /* This makes the list take up available space */
    min-height: 100px; /* Ensure it's always droppable */
}

/* Add a visual cue for empty drop zone */
#unplaced-lessons-list:empty::after {
    content: 'درس‌ها را برای بازگرداندن به اینجا بکشید';
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    min-height: 100px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: center;
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 1rem;
}

.sidebar .item-list.drag-over-sidebar {
    background-color: var(--accent-color);
    opacity: 0.1;
    border-radius: var(--border-radius-lg);
}

.empty-list-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 1rem;
}

.list-item {
    background-color: var(--primary-bg);
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    border-radius: var(--border-radius-md);
    border-right: 5px solid var(--accent-color);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all var(--transition-speed);
}

.list-item.draggable {
    cursor: grab;
}

.list-item.dragging {
    opacity: 0.4;
    transform: scale(1.05);
    box-shadow: var(--shadow);
}

.item-name {
    font-weight: 500;
}

.list-item .teacher-name,
.list-item .room-name {
    font-size: 0.85em;
    color: var(--text-secondary);
}

.list-item .class-name-sidebar {
    font-size: 0.8em;
    font-weight: 700;
    color: var(--accent-color);
    margin-top: 4px;
}

.item-controls {
    display: flex;
    gap: 0.5rem;
}

.item-controls button {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-secondary);
    transition: color var(--transition-speed);
    padding: 0.25rem;
}

.item-controls button:hover {
    color: var(--accent-color);
}

.teacher-load-item {
    display: flex;
    justify-content: space-between;
    padding: 0.6rem 0.5rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
}
.teacher-load-item span:last-child {
    font-weight: bold;
    color: var(--accent-color);
}
.teacher-load-item .total-load {
    color: var(--text-secondary);
    font-size: 0.85em;
    margin-right: 4px;
}

/* Schedule Display */
.schedule-display {
    flex-grow: 1;
    padding: 1rem;
    overflow: auto; /* This is now the main scroll container */
    background-color: var(--primary-bg);
    position: relative;
}

.view-container {
    display: none;
    height: 100%;
}

.view-container.active {
    display: block;
}

.empty-state {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
    color: var(--text-secondary);
    text-align: center;
}

.empty-state h3 {
    color: var(--text-primary);
}

.schedule-container {
    overflow: auto;
    height: 100%;
    padding: 2px;
    border: 2px solid var(--day-separator-color);
    border-radius: var(--border-radius-lg);
}

/* Table Styles */
.schedule-table {
    width: 100%;
    border-collapse: collapse;
    text-align: center;
    table-layout: fixed;
    border-spacing: 0;
    font-size: calc(13px * var(--table-zoom));
}

.schedule-table th,
.schedule-table td {
    border: 1px solid var(--border-color);
    padding: 2px;
    min-width: calc(110px * var(--table-zoom));
    height: calc(85px * var(--table-zoom));
    transition: all var(--transition-speed);
    position: relative;
    vertical-align: top;
}

.schedule-table tbody tr {
    border-bottom: 2px solid var(--day-separator-color);
}

.schedule-table td.day-separator {
    border-left: 2px solid var(--day-separator-color);
}
.schedule-table th.day-separator {
    border-left: 2px solid var(--day-separator-color);
}


.schedule-table th {
    background-color: var(--table-header-bg);
    font-weight: 700;
    position: sticky;
    top: 0;
    z-index: 21; /* Higher than sticky-col */
    padding: calc(0.25rem * var(--table-zoom));
    height: auto;
    min-height: calc(30px * var(--table-zoom));
}

.schedule-table th.class-header {
    vertical-align: middle;
}
.schedule-table th.class-header > div {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
}

.schedule-table .day-header {
    top: 0;
    z-index: 22; /* Higher than period-header */
}

.schedule-table .period-header {
    top: calc(30px * var(--table-zoom));
    min-width: calc(80px * var(--table-zoom));
}

.schedule-table .sticky-col {
    position: sticky;
    right: 0;
    z-index: 25; /* Higher than regular cells */
    background-color: var(--table-header-bg);
    width: calc(150px * var(--table-zoom));
    border-left: 2px solid var(--day-separator-color);
}

.schedule-table thead tr:first-child .sticky-col { z-index: 30; } /* Highest */
.schedule-table thead tr:nth-child(2) .sticky-col { z-index: 30; }
.schedule-table tbody tr:hover { background-color: var(--table-row-hover); }
.schedule-table tbody tr {
    background-color: var(--secondary-bg);
    background-image: linear-gradient(to right, rgba(var(--field-color-rgb), var(--field-color-opacity)), rgba(var(--field-color-rgb), var(--field-color-opacity)));
}


.drop-zone {
    padding: 3px;
    transition: background-color var(--transition-speed);
}

.drop-zone.drag-over {
    background-color: var(--accent-color) !important;
    opacity: 0.3;
}
.drop-zone.invalid-drop {
    background-color: var(--danger-color) !important;
    opacity: 0.4;
    cursor: not-allowed;
}
.drop-zone.merge-select {
    background-color: var(--accent-color);
    opacity: 0.5;
}


.lesson-in-table {
    width: 100%;
    height: 100%;
    color: white;
    border-radius: var(--border-radius-sm);
    padding: calc(0.3rem * var(--table-zoom));
    cursor: grab;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: all var(--transition-speed);
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 -3px 8px rgba(0,0,0,0.2);
}

.preparing-export .lesson-in-table {
    box-shadow: none !important;
    border: 1px solid #777;
}

.lesson-in-table.highlighted-lesson {
    outline: 3px solid var(--highlight-color);
    outline-offset: -3px;
    animation: pulse-highlight 1.5s infinite;
}

@keyframes pulse-highlight {
    0% { box-shadow: inset 0 -3px 8px rgba(0,0,0,0.2), 0 0 0 0 rgba(var(--highlight-color-rgb), 0.7); }
    70% { box-shadow: inset 0 -3px 8px rgba(0,0,0,0.2), 0 0 0 10px rgba(var(--highlight-color-rgb), 0); }
    100% { box-shadow: inset 0 -3px 8px rgba(0,0,0,0.2), 0 0 0 0 rgba(var(--highlight-color-rgb), 0); }
}


.lesson-in-table:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow);
    z-index: 5;
}

.lesson-in-table .lesson-name-cell,
.lesson-in-table .teacher-name-cell {
    white-space: normal; /* Allow text to wrap */
    overflow: visible;
    text-overflow: clip;
    width: 100%;
    display: block;
    line-height: 1.3;
}

.lesson-in-table .lesson-name-cell {
    font-weight: bold;
    font-size: calc(0.9em * var(--table-zoom));
}

.lesson-in-table .teacher-name-cell {
    font-size: calc(0.8em * var(--table-zoom));
    opacity: 0.9;
    margin-top: calc(4px * var(--table-zoom));
}

.lesson-in-table.conflict {
    background-color: var(--conflict-bg) !important;
    color: var(--conflict-text) !important;
    animation: pulse 1.5s infinite;
}

/* Shared Slot Styles */
.shared-slot-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
    gap: 2px;
    justify-content: space-around;
}
.shared-slot-container .lesson-in-table {
    flex-grow: 1;
    height: auto;
    min-height: 0;
    padding: calc(2px * var(--table-zoom));
    box-shadow: inset 0 -1px 3px rgba(0,0,0,0.2);
}

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.7; } }

.locked-slot {
    background: var(--locked-slot-bg);
    cursor: not-allowed;
}

#active-highlights-container {
    padding: 1rem 0 0.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
    min-height: 40px;
    border-top: 1px solid var(--border-color);
    margin-top: 1rem;
}

.highlight-tag {
    background-color: var(--highlight-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius-md);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.highlight-tag .remove-highlight-btn {
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity var(--transition-speed);
    background: none;
    border: none;
    color: white;
    padding: 0 0.2rem;
    line-height: 1;
}
.highlight-tag .remove-highlight-btn:hover {
    opacity: 1;
}

/* Integrated View Styles */
#app-container.integrated-view .schedule-display {
    overflow: visible;
}
#app-container.integrated-view .schedule-container {
    overflow: visible;
    height: auto;
}
#app-container.integrated-view .schedule-table th,
#app-container.integrated-view .schedule-table td {
    height: 60px;
    min-width: 90px;
    padding: 0;
    font-size: 11px;
}
#app-container.integrated-view .schedule-table .sticky-col { width: 100px; }
#app-container.integrated-view .lesson-in-table { padding: 0.2rem; font-size: 0.85em; }
#app-container.integrated-view .lesson-in-table .teacher-name-cell { margin-top: 2px; }

/* Validation Panel */
.validation-panel {
    background-color: var(--secondary-bg);
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.1);
    z-index: 50;
    transition: max-height 0.4s ease-in-out;
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
    max-height: 45px; /* Collapsed height */
    overflow: hidden;
}

.validation-panel.open { 
    max-height: 250px; /* Expanded height */
}

.validation-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1.5rem;
    cursor: pointer;
    height: 45px;
}

.validation-header h3 { margin: 0; font-size: 1.1rem; }

.toggle-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    transition: transform var(--transition-speed);
}

.validation-panel.open .toggle-btn { transform: rotate(180deg); }

.validation-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    padding: 1rem 1.5rem;
    overflow-y: auto;
}

.stats-container h4,
.conflicts-container h4 {
    margin-top: 0;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.stat-item,
.conflict-item { font-size: 0.9rem; padding: 0.25rem 0; }
.conflict-item { color: var(--danger-color); }
.no-conflict-text { color: var(--success-color); }

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 1001;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s;
}

#settings-modal { z-index: 1000; }
#confirm-modal { z-index: 1002; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal-content {
    background-color: var(--secondary-bg);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    width: 90%;
    max-width: 500px;
    position: relative;
    box-shadow: var(--shadow);
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

.modal-content.wide { max-width: 900px; }

.modal-content > h2 {
    flex-shrink: 0;
}

.modal-content > .settings-tabs {
    flex-shrink: 0;
}

.modal-content > .tab-content {
    overflow-y: auto;
}

.close-btn {
    color: #aaa;
    position: absolute;
    left: 1rem;
    top: 1rem;
    font-size: 1.75rem;
    font-weight: bold;
    cursor: pointer;
}

.modal-content form { display: flex; flex-direction: column; gap: 1rem; }

.modal-content input,
.modal-content select {
    padding: 0.75rem;
    font-family: var(--font-family);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    background-color: var(--primary-bg);
    color: var(--text-primary);
}

.form-submit-btn {
    padding: 0.75rem 1.5rem;
    color: white;
    border: none;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-size: 1rem;
    background-color: var(--success-color);
    transition: background-color var(--transition-speed);
    font-family: var(--font-family);
}

.form-submit-btn:hover { filter: brightness(1.1); }
.form-submit-btn.danger { background-color: var(--danger-color); }
.form-submit-btn.secondary { background-color: var(--text-secondary); }

.settings-tabs {
    display: flex;
    flex-wrap: wrap;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.tab-btn {
    background: none;
    border: none;
    padding: 0.75rem 1rem;
    cursor: pointer;
    font-family: var(--font-family);
    font-size: 1rem;
    color: var(--text-secondary);
    position: relative;
    border-bottom: 3px solid transparent;
}

.tab-btn.active {
    color: var(--accent-color);
    font-weight: bold;
    border-bottom-color: var(--accent-color);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

.settings-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.settings-section { display: flex; flex-direction: column; gap: 0.75rem; }
.settings-section h3 {
    margin-top: 0;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

.panel-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.75rem;
    font-family: var(--font-family);
    font-size: 1rem;
    color: white;
    background-color: var(--accent-color);
    border: none;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: background-color var(--transition-speed);
}

.panel-btn:hover { background-color: var(--accent-hover); }
.panel-btn.danger { background-color: var(--danger-color); }
.panel-btn.danger:hover { filter: brightness(0.9); }
.panel-btn.warning { background-color: var(--warning-color); }
.panel-btn.warning:hover { filter: brightness(1.1); }
.panel-btn.success { background-color: var(--success-color); }
.panel-btn.success:hover { filter: brightness(0.9); }
.panel-btn.secondary { background-color: var(--text-secondary); }
.panel-btn.secondary:hover { filter: brightness(1.1); }

.help-text { font-size: 0.85rem; color: var(--text-secondary); margin: -0.5rem 0 0.5rem; }

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0;
}

.toggle-switch-label { position: relative; display: inline-block; width: 50px; height: 26px; }
.toggle-switch-input { opacity: 0; width: 0; height: 0; }
.toggle-switch-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    border-radius: 26px;
    transition: var(--transition-speed);
}
.toggle-switch-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: 50%;
    transition: var(--transition-speed);
}
.toggle-switch-input:checked+.toggle-switch-slider { background-color: var(--accent-color); }
.toggle-switch-input:checked+.toggle-switch-slider:before { transform: translateX(24px); }

.management-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}
.management-column { background: var(--primary-bg); padding: 1rem; border-radius: var(--border-radius-lg); }
.management-column .item-list { max-height: 350px; overflow-y: auto; }
.management-column h3 { margin-top: 0; }

.constraints-controls { display: flex; gap: 1rem; margin-bottom: 1rem; align-items: center; }
#constraints-schedule table { width: 100%; }
#constraints-schedule td {
    height: 40px;
    cursor: pointer;
    transition: background-color var(--transition-speed);
    border: 1px solid var(--border-color);
}
#constraints-schedule td:hover { background-color: var(--primary-bg); }
#constraints-schedule .locked-slot { background: var(--locked-slot-bg); }

#change-log-tab .item-list {
    max-height: 400px;
    overflow-y: auto;
}
#change-log-list .list-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    border-right-color: var(--warning-color);
}
.log-time {
    font-size: 0.8em;
    color: var(--text-secondary);
}
.log-desc {
    font-size: 0.9em;
}


.about-section p { line-height: 1.8; }
.contact-links p { display: flex; align-items: center; gap: 0.75rem; }

.highlight-controls {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    align-items: center;
}
.highlight-controls select {
    flex-grow: 1;
}

/* Toast, Tooltip */
#toast-container { position: fixed; bottom: 20px; left: 20px; z-index: 9999; }
.toast {
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    border-radius: var(--border-radius-md);
    color: white;
    font-size: 1rem;
    box-shadow: var(--shadow);
    opacity: 0;
    transform: translateY(100%);
    animation: slideUp 0.5s forwards;
    max-width: 350px;
    display: flex;
    align-items: center;
    gap: 1rem;
}
.toast-btn {
    padding: 0.3rem 0.8rem;
    border: 1px solid white;
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    white-space: nowrap;
    font-family: var(--font-family); /* Font fix */
}
.toast-btn:hover { background-color: rgba(255, 255, 255, 0.4); }

@keyframes slideUp { to { opacity: 1; transform: translateY(0); } }

.toast.success { background-color: var(--success-color); }
.toast.error { background-color: var(--danger-color); }
.toast.info { background-color: var(--accent-color); }
.toast.warning { background-color: var(--warning-color); }

#confirm-modal .modal-content { max-width: 400px; text-align: center; }
#confirm-title { font-size: 1.25rem; color: var(--danger-color); }
.confirm-buttons { display: flex; justify-content: center; gap: 1rem; margin-top: 1.5rem; }

#conflict-tooltip {
    position: fixed;
    background-color: var(--tooltip-bg);
    color: var(--tooltip-text);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-md);
    z-index: 10001;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-speed);
    font-size: 0.9rem;
}

/* Loading Spinner */
#loading-spinner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
}
.dark-theme #loading-spinner { background: rgba(0, 0, 0, 0.8); }
.spinner {
    border: 8px solid #f3f3f3;
    border-top: 8px solid var(--accent-color);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
}

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

/* Print Styles */
@media print {
    @page { size: A4 landscape; margin: 0.5cm; }

    body {
        background-color: #fff !important;
        color: #000 !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
        overflow: visible !important;
    }
    
    body.printing .sidebar, 
    body.printing .app-header, 
    body.printing .validation-panel,
    body.printing .main-content > *:not(.schedule-display),
    body.printing .schedule-display > *:not(.view-container.active):not(#print-all-container) {
        display: none !important;
    }
    
    body.printing #app-container, 
    body.printing .main-content, 
    body.printing .schedule-display, 
    body.printing .view-container.active,
    body.printing .schedule-container {
        display: block !important;
        height: auto !important;
        overflow: visible !important;
        width: 100% !important;
        padding: 0 !important;
        margin: 0 !important;
        border: none !important;
    }

    .schedule-table {
        font-size: 7pt;
        width: 100%;
        border-spacing: 0;
        transform: scale(1);
        border: 1px solid #333;
    }

    .schedule-table th, .schedule-table td {
        border: 1px solid #ccc !important;
        background-color: #fff !important;
        color: #000 !important;
        padding: 1px;
    }
    
    .schedule-table .sticky-col { position: static; }

    .lesson-in-table {
        border: 1px solid #999;
        height: 100%;
        padding: 2px;
        font-size: 6.5pt;
        box-shadow: none;
    }

    body.bw-print .lesson-in-table {
        background-color: #fff !important;
        color: #000 !important;
    }

    body:not(.bw-print) .lesson-in-table {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    body:not(.bw-print) .lesson-in-table.conflict {
        background-color: #ffdddd !important;
        border-color: red !important;
    }

    #print-all-container {
        display: block !important;
    }
    #print-all-container .schedule-container {
        page-break-before: always;
    }
    #print-all-container .schedule-container:first-child {
        page-break-before: auto;
    }
}
/* Sample File Links in Settings Modal */
.sample-links-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin: 0.5rem 0 1.25rem; /* Adds space above and below the links */
}

.sample-link {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 1rem;
    background-color: var(--primary-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-speed);
    font-size: 0.9rem;
    font-weight: 500;
}

.sample-link:hover {
    background-color: var(--border-color);
    color: var(--accent-color);
    border-color: var(--accent-color);
    transform: translateY(-2px);
}