@import url('https://fonts.googleapis.com/css2?family=Tajawal:wght@400;500;700&display=swap');

:root {
    /* Light Theme */
    --primary-color: #4f46e5;
    --primary-dark: #4338ca;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    
    --text-main: #1e293b;
    --text-muted: #64748b;
    
    --bg-main: #f8fafc;
    --bg-white: #ffffff;
    --bg-alt: #f1f5f9;
    --bg-hover: #e0e7ff;
    
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --conflict-bg: #fee2e2;
    --conflict-bg-alt: #fecaca;
    --conflict-border: #ef4444;
    --alert-bg: #fef3c7;
    --alert-text: #92400e;
    --alert-border: #fde68a;
    
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.3);
}

[data-theme="dark"] {
    --primary-color: #6366f1;
    --primary-dark: #818cf8;
    --secondary-color: #94a3b8;
    --success-color: #10b981;
    --danger-color: #f87171;
    --warning-color: #fbbf24;
    
    --text-main: #f8fafc;
    --text-muted: #cbd5e1;
    
    --bg-main: #0f172a;
    --bg-white: #1e293b;
    --bg-alt: #334155;
    --bg-hover: #312e81;
    
    --border-color: #334155;
    --border-light: #1e293b;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
    
    --conflict-bg: #450a0a;
    --conflict-bg-alt: #7f1d1d;
    --conflict-border: #dc2626;
    --alert-bg: #422006;
    --alert-text: #fde68a;
    --alert-border: #78350f;
    
    --glass-bg: rgba(30, 41, 59, 0.85);
    --glass-border: rgba(51, 65, 85, 0.3);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Tajawal', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography & Utilities */
h1, h2, h3, h4, h5, h6 { font-weight: 700; color: var(--text-main); }
.text-center { text-align: center; }
.full-width { grid-column: 1 / -1; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    border: none;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}
.btn:active { transform: translateY(1px); }
.btn-sm { padding: 0.35rem 0.85rem; font-size: 0.875rem; }
.btn-primary { background-color: var(--primary-color); color: white; }
.btn-primary:hover { background-color: var(--primary-dark); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.btn-secondary { background-color: var(--secondary-color); color: white; }
.btn-secondary:hover { filter: brightness(1.1); }
.btn-success { background-color: var(--success-color); color: white; }
.btn-success:hover { filter: brightness(1.1); }
.btn-danger { background-color: var(--danger-color); color: white; }
.btn-danger:hover { filter: brightness(1.1); }
.btn-outline { background-color: transparent; border: 1px solid var(--border-color); color: var(--text-main); box-shadow: none; }
.btn-outline:hover { background-color: var(--bg-alt); border-color: var(--primary-color); color: var(--primary-color); }

/* Forms */
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 500; color: var(--text-main); }
.form-control {
    width: 100%;
    padding: 0.65rem 1rem;
    background-color: var(--bg-white);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}
.form-control:focus { outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2); }

/* Header */
.app-header {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 2.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}
.logo { display: flex; align-items: center; gap: 0.75rem; color: var(--primary-color); }
.app-logo { width: 40px; height: 40px; object-fit: cover; border-radius: 8px; box-shadow: var(--shadow-sm); }
.logo h1 { font-size: 1.5rem; margin: 0; letter-spacing: -0.5px; }
.main-nav { display: flex; gap: 0.5rem; }
.nav-btn {
    background: transparent;
    border: none;
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.6rem 1.25rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.nav-btn:hover { color: var(--text-main); background-color: var(--bg-alt); }
.nav-btn.active { color: var(--primary-color); background-color: var(--bg-hover); font-weight: 700; }
.header-actions { display: flex; gap: 0.75rem; }

/* Main Content */
.app-content { padding: 2rem; max-width: 1400px; margin: 0 auto; }
.view-section { display: none; animation: fadeIn 0.4s ease-out; }
.view-section.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* Toolbar */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
    background: var(--bg-white);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}
.toolbar-left, .toolbar-right { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }
.toolbar-right select { min-width: 140px; }

/* Schedule Container (Sidebar + Grid) */
.schedule-container {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 1.5rem;
    align-items: start;
}

/* Teachers Sidebar */
.teachers-sidebar {
    background: var(--bg-white);
    padding: 1.25rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    max-height: calc(100vh - 200px);
    overflow-y: auto;
}
.teachers-sidebar::-webkit-scrollbar { width: 6px; }
.teachers-sidebar::-webkit-scrollbar-thumb { background-color: var(--border-color); border-radius: 10px; }
.teachers-sidebar h3 { margin-bottom: 1.25rem; padding-bottom: 0.75rem; border-bottom: 1px solid var(--border-color); font-size: 1.2rem; }
.teacher-list-filter { margin-bottom: 1rem; }
.draggable-teacher {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    padding: 1rem;
    margin-bottom: 0.75rem;
    border-radius: var(--border-radius);
    cursor: grab;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}
.draggable-teacher:active { cursor: grabbing; transform: scale(0.98); }
.draggable-teacher:hover { border-color: var(--primary-color); transform: translateY(-3px); box-shadow: var(--shadow-md); background: var(--bg-white); }
.teacher-name { font-weight: 700; color: var(--primary-color); font-size: 1.1rem; }
.teacher-subject { font-size: 0.9rem; color: var(--text-muted); margin-top: 0.2rem; }
.teacher-quota { font-size: 0.85rem; background: var(--bg-alt); color: var(--text-main); padding: 0.2rem 0.6rem; border-radius: 6px; display: inline-block; margin-top: 0.5rem; align-self: flex-start; font-weight: 500; border: 1px solid var(--border-color); }

/* Schedule Grid */
.schedule-grid-wrapper {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    overflow-x: auto;
}
.master-schedule table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    text-align: center;
}
.master-schedule th, .master-schedule td {
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    min-width: 120px;
}
.master-schedule th {
    background-color: var(--bg-alt);
    font-weight: 700;
    color: var(--text-main);
    position: sticky;
    top: 0;
    z-index: 10;
}
.master-schedule tr:first-child th:first-child { border-top-right-radius: var(--border-radius); }
.master-schedule tr:first-child th:last-child { border-top-left-radius: var(--border-radius); }
.day-header { background-color: var(--primary-color) !important; color: white !important; font-size: 1.1rem; border-color: var(--primary-dark) !important; }

/* Grid Cells (Droppable Area) */
.schedule-cell {
    height: 90px;
    vertical-align: top;
    position: relative;
    transition: background-color 0.2s, border-color 0.2s;
    background-color: var(--bg-main);
}
.schedule-cell.drag-over {
    background-color: var(--bg-hover);
    border: 2px dashed var(--primary-color);
}
.schedule-cell.conflict {
    background-color: var(--conflict-bg);
    border: 2px solid var(--danger-color);
    animation: flashConflict 1.5s infinite alternate;
}

@keyframes flashConflict {
    from { background-color: var(--conflict-bg); }
    to { background-color: var(--conflict-bg-alt); }
}

.assigned-slot {
    background: var(--bg-white);
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    padding: 0.5rem;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    position: relative;
    transition: var(--transition);
}
.assigned-slot:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.assigned-slot .remove-btn {
    position: absolute;
    top: -8px;
    left: -8px;
    background: var(--danger-color);
    border: none;
    color: white;
    cursor: pointer;
    font-size: 0.8rem;
    width: 22px; height: 22px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    opacity: 0;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}
.assigned-slot:hover .remove-btn { opacity: 1; transform: scale(1.1); }
.assigned-slot.conflict-slot {
    border-color: var(--conflict-border);
    background: var(--conflict-bg);
}
.assigned-slot .t-name { font-weight: 700; font-size: 0.95rem; color: var(--text-main); }
.assigned-slot .t-subject { font-size: 0.8rem; color: var(--text-muted); margin-top: 2px; }

/* Settings Grid */
.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 2rem;
}
.settings-card {
    background: var(--bg-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: var(--transition);
}
.settings-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card-header {
    background: var(--bg-alt);
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.card-header h2 { font-size: 1.25rem; margin: 0; display: flex; align-items: center; gap: 0.75rem; color: var(--primary-color); }
.card-body { padding: 1.5rem; }
.setting-item { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; padding-bottom: 1rem; border-bottom: 1px solid var(--border-color); }
.setting-item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.setting-label { font-weight: 500; color: var(--text-muted); }
.setting-value { font-weight: 700; font-size: 1.2rem; color: var(--text-main); background: var(--bg-alt); padding: 0.2rem 1rem; border-radius: 20px; }

/* Data Tables */
.table-responsive { overflow-x: auto; }
.data-table { width: 100%; border-collapse: separate; border-spacing: 0; }
.data-table th, .data-table td { padding: 1rem; text-align: right; border-bottom: 1px solid var(--border-color); }
.data-table th { background-color: var(--bg-alt); font-weight: 700; color: var(--text-muted); text-transform: uppercase; font-size: 0.9rem; letter-spacing: 0.5px; }
.data-table tr { transition: var(--transition); }
.data-table tr:hover { background-color: var(--bg-hover); }
.action-btns { display: flex; gap: 0.5rem; justify-content: flex-end; }
.action-btns button { padding: 0.4rem 0.75rem; font-size: 0.9rem; border-radius: 6px; }

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}
.modal.show { display: flex; animation: modalFadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1); }
@keyframes modalFadeIn { from { opacity: 0; backdrop-filter: blur(0px); } to { opacity: 1; backdrop-filter: blur(4px); } }
.modal-content {
    background-color: var(--bg-white);
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transform: scale(1);
    animation: modalScaleIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes modalScaleIn { from { transform: scale(0.95) translateY(10px); opacity: 0; } to { transform: scale(1) translateY(0); opacity: 1; } }
.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-alt);
}
.close-modal { font-size: 1.5rem; cursor: pointer; color: var(--text-muted); transition: var(--transition); }
.close-modal:hover { color: var(--danger-color); transform: rotate(90deg); }
.modal-body { padding: 1.75rem 1.5rem; }
.modal-footer {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    background: var(--bg-alt);
}

/* Alerts */
.alert { padding: 1rem 1.25rem; border-radius: var(--border-radius); margin-bottom: 1.25rem; display: flex; align-items: center; gap: 0.75rem; }
.alert-warning { background-color: var(--alert-bg); color: var(--alert-text); border: 1px solid var(--alert-border); font-weight: 500; }

/* Toasts */
.toast-container {
    position: fixed;
    bottom: 24px;
    left: 24px;
    z-index: 9999;
}

    display: flex;
    flex-direction: column;
    gap: 12px;
}
.toast {
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    color: white;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 1rem;
    font-weight: 500;
    animation: slideIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards, fadeOut 0.4s ease 3s forwards;
    opacity: 0;
}
.toast.success { background-color: var(--success-color); }
.toast.error { background-color: var(--danger-color); }
.toast.warning { background-color: var(--warning-color); color: #000; }
@keyframes slideIn { from { transform: translateX(-120%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes fadeOut { from { opacity: 1; transform: translateY(10px); } to { opacity: 0; display: none; } }

/* Print Styles */
@media print {
    .no-print { display: none !important; }
    body { background: white; color: black; }
    .app-content { padding: 0; margin: 0; max-width: none; }
    .schedule-container { display: block; }
    .schedule-grid-wrapper { box-shadow: none; padding: 0; border: none; }
    .master-schedule th, .master-schedule td { border-color: #000; color: #000; }
    .assigned-slot { border-color: #333; background: white; box-shadow: none; }
}

.empty-state {
    text-align: center;
    padding: 5rem 2rem;
    color: var(--text-muted);
    background: var(--bg-white);
    border-radius: var(--border-radius);
    border: 1px dashed var(--border-color);
}
.empty-state i {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    color: var(--border-color);
}

/* --- Dashboard & Stats --- */
.dashboard-bar {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
    background: #fdfdfd;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #eee;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

body.dark-mode .dashboard-bar {
    background: var(--bg-color);
    border-color: var(--border-color);
}

.stat-card {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    border-right: 1px solid var(--border-color);
    padding-right: 15px;
}
.stat-card:last-child {
    border-right: none;
    padding-right: 0;
}

.stat-title {
    font-size: 0.85rem;
    color: var(--text-color);
    opacity: 0.8;
    margin-bottom: 5px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.progress-bar-bg {
    background: var(--border-color);
    height: 10px;
    border-radius: 5px;
    overflow: hidden;
    margin-top: 5px;
}

.progress-bar-fill {
    background: var(--secondary-color);
    height: 100%;
    width: 0%;
    transition: width 0.3s ease;
}

/* --- Lock Icon --- */
.lock-btn {
    position: absolute;
    top: 2px;
    left: 2px;
    background: none;
    border: none;
    color: rgba(0,0,0,0.3);
    cursor: pointer;
    font-size: 0.8rem;
    padding: 2px 4px;
    border-radius: 3px;
}

body.dark-mode .lock-btn {
    color: rgba(255,255,255,0.3);
}

.lock-btn:hover {
    color: var(--primary-color);
    background: rgba(0,0,0,0.05);
}

.locked-slot {
    border: 2px solid var(--primary-color) !important;
}

.locked-slot .lock-btn {
    color: var(--primary-color);
}

/* --- Print Styles --- */
@media print {
    .no-print {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .print-header {
        display: block !important;
        text-align: center;
        margin-bottom: 20px;
        padding-bottom: 10px;
        border-bottom: 2px solid #ccc;
    }

    .print-header h1 {
        margin: 0 0 10px 0;
        font-size: 24px;
    }

    .print-header p {
        margin: 5px 0;
        font-size: 16px;
    }

    /* Standard Print */
    @page {
        margin: 10mm;
    }

    /* Comprehensive Print Mode (A3) */
    body.comprehensive-print-mode @page {
        size: A3 landscape;
        margin: 10mm;
    }
    
    body.comprehensive-print-mode .view-section {
        display: none !important;
    }

    body.comprehensive-print-mode #comprehensive-print-container {
        display: flex !important;
        flex-wrap: wrap;
        gap: 10px;
        justify-content: center;
    }

    #comprehensive-print-container .class-schedule-wrapper {
        width: 48%; /* Fits 2 tables side-by-side on A3 landscape comfortably */
        margin-bottom: 20px;
        page-break-inside: avoid;
    }
    
    #comprehensive-print-container h3 {
        text-align: center;
        margin-bottom: 5px;
        background: #f0f0f0;
        padding: 5px;
        border: 1px solid #ccc;
        font-size: 14px;
    }

    #comprehensive-print-container table {
        width: 100%;
        border-collapse: collapse;
        text-align: center;
        font-size: 11px;
    }

    #comprehensive-print-container th, 
    #comprehensive-print-container td {
        border: 1px solid #000;
        padding: 2px;
        word-wrap: break-word;
    }

    #comprehensive-print-container th {
        background-color: #f0f0f0;
        font-weight: bold;
    }

    #comprehensive-print-container .assigned-slot {
        padding: 2px !important;
        border-radius: 4px;
        border: none;
        box-shadow: none;
        min-height: 40px;
    }

    #comprehensive-print-container .t-name {
        font-weight: bold;
        font-size: 11px;
    }

    #comprehensive-print-container .t-subject {
        font-size: 10px;
    }
}

.print-header {
    display: none;
}
#comprehensive-print-container {
    display: none;
}

/* --- Search Highlight --- */
.table-searching .assigned-slot {
    opacity: 0.15;
    transition: opacity 0.2s, transform 0.2s;
}
.table-searching .assigned-slot.highlight-match {
    opacity: 1 !important;
    box-shadow: 0 0 12px rgba(0, 123, 255, 0.6) !important;
    transform: scale(1.05);
    z-index: 10;
    position: relative;
    border: 2px solid #007bff !important;
}

/* --- Mobile Responsiveness --- */
@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    .main-nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    .schedule-container {
        grid-template-columns: 1fr;
    }
    .teachers-sidebar {
        max-height: 300px;
        order: -1;
    }
    .dashboard-bar {
        flex-direction: column;
        gap: 0.5rem;
    }
    .stat-card {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 0.5rem;
        padding-right: 0;
    }
    .stat-card:last-child {
        border-bottom: none;
    }
    .toolbar-left, .toolbar-right {
        justify-content: center;
        width: 100%;
    }
    .toolbar-right select, .toolbar-right input {
        width: 100%;
        max-width: none;
    }
}