:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --light-gray: #ecf0f1;
    --medium-gray: #bdc3c7;
    --white: #fff;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --success-color: #2ecc71;
    --copy-color: #9b59b6;
    --conflict-color-glow: rgba(255, 82, 82, 0.7);
    --base-font-size: 14px;
    --first-column-width: 100px;
    --data-column-width: 85px;
    --data-row-height: 85px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f6;
    color: #333;
    margin: 0;
    padding: 20px;
    font-size: var(--base-font-size);
}

.container, .auth-container {
    max-width: 95%;
    margin: auto;
    background: var(--white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

h1, h2, h3, h4 {
    text-align: center;
    color: var(--secondary-color);
}
h2 {
     border-bottom: 2px solid var(--primary-color);
     padding-bottom: 10px;
     margin-bottom: 25px;
}

.management-section {
    background-color: var(--light-gray);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 25px;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
    align-items: start;
}

.data-management-grid {
     display: grid;
     grid-template-columns: repeat(3, 1fr);
     gap: 30px;
}

label {
    font-weight: 600;
    margin-bottom: 5px;
    display: block;
    color: #34495e;
}

input, select, button {
    width: 100%;
    padding: 10px;
    border-radius: 6px;
    border: 1px solid var(--medium-gray);
    box-sizing: border-box;
    transition: all 0.3s ease;
    font-size: 1em;
}

select[multiple] {
    height: 120px;
    padding: 5px;
}

input:focus, select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.5);
    outline: none;
}

button {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    cursor: pointer;
    font-weight: bold;
    margin-top: 5px;
}

button:hover { background-color: #2980b9; }
button.edit-btn { background-color: var(--warning-color); padding: 5px 10px; font-size: 0.9em; margin: 0; }
button.edit-btn:hover { background-color: #e67e22; }
button.delete-btn { background-color: var(--danger-color); padding: 5px 10px; font-size: 0.9em; margin: 0;}
button.delete-btn:hover { background-color: #c0392b; }
button.cancel-btn { background-color: var(--medium-gray); }
button.cancel-btn:hover { background-color: #95a5a6; }
button.copy-btn { background-color: var(--copy-color); padding: 5px 10px; font-size: 0.9em; margin: 0;}
button.copy-btn:hover { background-color: #8e44ad; }

table { 
    width: 100%; 
    border-collapse: collapse; 
    margin-top: 0; 
    border: 3px solid var(--secondary-color);
}
th, td { border: 1px solid #ddd; padding: 2px; text-align: center; vertical-align: middle; }

.main-schedule-container table { table-layout: fixed; }
.main-schedule-container th:first-child, .main-schedule-container td:first-child { 
    width: var(--first-column-width); 
    white-space: normal; 
    word-break: break-word; 
    padding: 0 10px;
    border-left: 3px solid var(--secondary-color) !important;
}
.main-schedule-container th:not(:first-child), .main-schedule-container td:not(:first-child),
#dailyScheduleTable th, #dailyScheduleTable td,
#singleClassScheduleTable th, #singleClassScheduleTable td,
#singleTeacherScheduleTable th, #singleTeacherScheduleTable td {
    width: var(--data-column-width); 
    height: var(--data-row-height); 
}

th { background-color: var(--secondary-color); color: var(--white); position: sticky; top: 0; z-index: 2; }
.main-schedule-container th:first-child { position: sticky; right: 0; z-index: 3; }
.main-schedule-container td:first-child { font-weight: bold; background-color: var(--light-gray); position: sticky; right: 0; z-index: 1; }

.card {
    background-color: var(--primary-color); color: var(--white);
    border-radius: 6px; cursor: grab;
    font-weight: bold; box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    text-align: center; overflow: hidden; white-space: normal;
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    width: 90%; height: 90%; box-sizing: border-box; padding: 2px;
    font-size: var(--base-font-size); line-height: 1.2;
    transition: transform 0.2s ease, opacity 0.2s ease, background-color 0.3s;
}
.unassigned-card {
    width: 75px; height: 75px;
    margin: 4px; display: inline-flex;
}
.card:active, .card.dragging { 
    cursor: grabbing; 
    opacity: 0.5; 
    transform: scale(0.95);
}

.available-slot { box-shadow: inset 0 0 15px 5px rgba(76, 175, 80, 0.6); }
.unavailable-slot { box-shadow: inset 0 0 15px 5px rgba(244, 67, 54, 0.6); }
.conflict-slot { box-shadow: inset 0 0 15px 5px var(--conflict-color-glow); }

#unassigned-cards-container {
    background-color: #e8eaf6; border: 2px dashed var(--primary-color); border-radius: 8px;
    padding: 10px; margin-top: 20px; min-height: 90px; display: flex;
    flex-wrap: wrap; align-content: flex-start;
}

.data-list { list-style-type: none; padding: 0; max-height: 200px; overflow-y: auto; border: 1px solid #ccc; border-radius: 6px; margin-top: 10px; }
.data-list li { padding: 8px; border-bottom: 1px solid #eee; }
.data-list li:last-child { border-bottom: none; }

.view-controls-flex { display: flex; flex-wrap: wrap; gap: 20px; align-items: flex-end;}
.view-control-group { display: flex; align-items: center; gap: 5px; }
.view-control-group select { width: 180px; }
.icon-btn { width: 45px; height: 45px; padding: 0; display: flex; justify-content: center; align-items: center; }
.icon-btn svg { width: 24px; height: 24px; fill: white; }

.view-container { display: none; }
.active-view-btn { background-color: #2980b9; box-shadow: inset 0 2px 4px rgba(0,0,0,0.3); }

.schedule-print-header { display: none; text-align: center; margin-bottom: 20px; }
.schedule-print-header h3 { margin: 0; }
.schedule-print-header p { margin: 2px 0; }

.day-divider { border-right: 3px solid var(--secondary-color) !important; }

.text-display { display: none; font-size: var(--base-font-size); }

body.text-mode .card { display: none; }
body.text-mode .text-display {
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    width: 100%; height: 100%; line-height: 1.2;
    text-align: center; word-wrap: break-word; color: black;
}

body.colors-off .card {
    background-color: var(--light-gray) !important;
    color: var(--secondary-color) !important;
    border: 1px solid var(--medium-gray);
}
body.colors-off .text-display {
    background-color: transparent !important;
    color: black !important;
}

.modal {
    display: none; position: fixed; z-index: 1000; left: 0; top: 0;
    width: 100%; height: 100%; overflow: auto; background-color: rgba(0,0,0,0.5);
}
.modal-content {
    background-color: #fefefe; margin: 5% auto; padding: 20px;
    border: 1px solid #888; width: 80%; max-width: 800px; border-radius: 10px;
}
.modal-close-btn { color: #aaa; float: left; font-size: 28px; font-weight: bold; cursor: pointer; }
#teacherAvailabilityGrid td, #teacherAvailabilityGrid th { height: 40px; width: 40px; cursor: pointer; font-size: 1.2em; }
#teacherAvailabilityGrid td.available { background-color: #d4edda; color: #155724; }
#teacherAvailabilityGrid td.unavailable { background-color: #f8d7da; color: #721c24; }
#editTeacherSubjectsCheckboxes label { display: flex; align-items: center; gap: 8px; margin-bottom: 5px; }
#editTeacherSubjectsCheckboxes input[type="checkbox"] { width: auto; height: auto; }

#app-container { display: none; }
.auth-container { max-width: 400px; margin: 5% auto; }
.auth-form { display: flex; flex-direction: column; gap: 15px; }
.auth-toggle { color: var(--primary-color); cursor: pointer; text-align: center; margin-top: 10px; }
#user-info { text-align: left; padding: 10px; }

.toggle-header { display: flex; justify-content: space-between; align-items: center; cursor: pointer; }
.toggle-icon { font-size: 1.5em; font-weight: bold; }
.quota-table-container { max-height: 520px; overflow-y: auto; }
#teacher-stats ul { list-style-type: none; padding: 0; column-count: 3; }

.action-buttons-group, .export-buttons-group { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.action-buttons-group button, .export-buttons-group button { flex: 1; min-width: 120px; }
.action-buttons-group button:nth-child(1) { background-color: var(--success-color); }
.action-buttons-group button:nth-child(2) { background-color: var(--warning-color); }
.action-buttons-group button:nth-child(3) { background-color: var(--copy-color); }
.export-buttons-group button:nth-child(1) { background-color: #1e3a59; }
.export-buttons-group button:nth-child(2) { background-color: #c0392b; }
.export-buttons-group button:nth-child(3) { background-color: #27ae60; }
.export-buttons-group button:nth-child(4) { background-color: #2980b9; }

.table-display-options { display: flex; gap: 15px; flex-wrap: wrap; align-items: center; justify-content: center; margin-top: 10px; }
.table-display-options .option-group { display: flex; gap: 5px; align-items: center; }
.table-display-options button { padding: 5px 10px; font-size: 0.9em; width: auto; }

@media (max-width: 768px) {
    .data-management-grid { grid-template-columns: 1fr; }
    .form-grid { grid-template-columns: 1fr; }
    body { padding: 10px; }
    .container { padding: 15px; }
    h1 { font-size: 1.5em; }
    h2 { font-size: 1.2em; }
    #teacher-stats ul { column-count: 1; }
}

/* ==========================================================================
   --- كود الطباعة الاحترافي ---
   ========================================================================== */
@media print {
    /* --- إعدادات الصفحة --- */
    @page {
        size: A4 landscape; /* تحديد حجم الصفحة A4 وبالعرض */
        margin: 1cm;      /* هوامش الصفحة */
    }

    /* --- إخفاء العناصر غير المرغوب فيها --- */
    body > *:not(.printable-area) {
        display: none !important;
    }
    .no-print, .modal, #user-info {
        display: none !important;
    }
    
    /* --- إظهار وتنسيق العناصر المراد طباعتها --- */
    body {
        padding: 0;
        margin: 0;
        --base-font-size: 10px; /* تصغير حجم الخط الأساسي للطباعة */
    }
    .printable-area {
        display: block !important;
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
    }
    .container {
        box-shadow: none !important;
        padding: 0 !important;
        margin: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
    }
    .schedule-print-header {
        display: block !important; /* إظهار رأس الطباعة */
    }

    /* --- التحكم في فواصل الصفحات (أهم جزء) --- */
    /* ابدأ صفحة جديدة قبل كل صف أو معلم في الجداول العامة */
    .page-break-before {
        page-break-before: always !important;
    }
    /* لا تبدأ بصفحة فارغة */
    tr.page-break-before:first-child {
        page-break-before: avoid !important;
    }
    
    /* --- تنسيق الجداول للطباعة --- */
    table {
        width: 100% !important;
        page-break-inside: avoid; /* محاولة إبقاء الجدول في صفحة واحدة */
    }
    .card { display: none !important; }
    .text-display { display: flex !important; }
    th, td { font-size: 8pt !important; }
}
/* لإخفاء كل الأزرار في شريط التصدير بشكل افتراضي */
.export-buttons-group > * {
  display: none;
}
/* لإظهار زري PDF و Excel فقط */
.export-buttons-group #pdfBtn,
.export-buttons-group #excelBtn {
  display: block;
}