:root {
    --primary-color: #0059ff;
    --primary-hover: #0046cc;
    --primary-light: rgba(0, 89, 255, 0.08);
    --bg-dark: #0f172a;
    --bg-light: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --error-color: #ef4444;
    --font-ar: 'Tajawal', sans-serif;
    --font-en: 'Inter', sans-serif;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
}

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

body {
    font-family: var(--font-ar);
    background-color: var(--bg-light);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Utilities */
.hidden {
    display: none !important;
}

.mb-6 {
    margin-bottom: 24px;
}

.text-muted {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.badge {
    background-color: var(--primary-light);
    color: var(--primary-color);
    padding: 6px 12px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.75rem;
}

.bg-light {
    background-color: var(--bg-light) !important;
}

.flex-1 {
    flex: 1;
}

.flex-column {
    display: flex;
    flex-direction: column;
}

.gap-6 {
    gap: 24px;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    backdrop-filter: blur(4px);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    font-family: var(--font-ar);
    font-size: 0.925rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--bg-light);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

.btn-danger {
    background-color: rgba(239, 68, 68, 0.08);
    color: var(--error-color);
}

.btn-danger:hover {
    background-color: var(--error-color);
    color: white;
}

.btn-block {
    width: 100%;
}

.btn-icon {
    padding: 10px;
    border-radius: var(--radius-md);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
}

/* Form Controls */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: white;
    font-family: var(--font-ar);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-light);
}

/* Toast Message */
.toast {
    position: fixed;
    top: 24px;
    left: 24px;
    padding: 16px 24px;
    border-radius: var(--radius-md);
    background-color: var(--bg-dark);
    color: white;
    box-shadow: var(--shadow-md);
    z-index: 10000;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 12px;
    transform: translateY(-20px);
    opacity: 0;
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.3s ease;
}

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

.toast.success {
    background-color: var(--success-color);
}

.toast.error {
    background-color: var(--error-color);
}

/* 1. LOGIN STYLING */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background-color: var(--bg-light);
    background-image: radial-gradient(circle at 10% 20%, rgba(0, 89, 255, 0.05) 0%, transparent 40%),
                      radial-gradient(circle at 90% 80%, rgba(0, 89, 255, 0.03) 0%, transparent 45%);
}

.login-card {
    width: 100%;
    max-width: 440px;
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 40px;
    border: 1px solid var(--border-color);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.logo-dot {
    width: 12px;
    height: 12px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: inline-block;
}

.login-header h1 {
    font-size: 1.35rem;
    font-weight: 800;
    margin-bottom: 6px;
}

.login-header p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* 2. DASHBOARD CONTAINER STYLING */
.dashboard-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--bg-dark);
    color: #f1f5f9;
    display: flex;
    flex-direction: column;
    border-left: 1px solid rgba(255, 255, 255, 0.05);
    flex-shrink: 0;
}

.sidebar-header {
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.sidebar-header h3 {
    font-size: 1.15rem;
    font-weight: 800;
    color: white;
}

.sidebar-menu {
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    background: transparent;
    border: none;
    color: #94a3b8;
    font-family: var(--font-ar);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    text-align: right;
    width: 100%;
    transition: var(--transition);
}

.nav-item:hover, .nav-item.active {
    color: white;
    background-color: rgba(255, 255, 255, 0.05);
}

.nav-item.active {
    background-color: var(--primary-color);
}

.sidebar-footer {
    padding: 20px 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-family: var(--font-en);
}

.user-details {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.user-role {
    font-size: 0.75rem;
    color: #94a3b8;
}

.user-email {
    font-size: 0.85rem;
    color: white;
    font-family: var(--font-en);
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden;
}

.btn-logout {
    background: transparent;
    color: #f87171;
    border: 1px solid rgba(248, 113, 113, 0.2);
    width: 100%;
}

.btn-logout:hover {
    background-color: rgba(248, 113, 113, 0.1);
}

/* Main Workspace */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0; /* Prevents flex items from overflowing */
}

.top-bar {
    height: 70px;
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.top-bar h2 {
    font-size: 1.25rem;
    font-weight: 800;
}

.content-wrapper {
    padding: 32px;
    overflow-y: auto;
    flex: 1;
}

/* Cards */
.card {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    padding: 24px;
    position: relative;
    overflow: hidden;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.card-header h3 {
    font-size: 1.1rem;
    font-weight: 800;
}

/* TAB CONTENT */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Teacher Grid Table */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.grid-table {
    width: 100%;
    border-collapse: collapse;
    text-align: right;
    min-width: 700px;
}

.grid-table th {
    background-color: var(--bg-light);
    color: var(--text-secondary);
    font-weight: 700;
    font-size: 0.85rem;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-color);
}

.grid-table td {
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
    background-color: white;
}

.grid-table tbody tr:last-child td {
    border-bottom: none;
}

/* Subject Column styling */
.grid-table td:first-child {
    font-weight: 700;
    color: var(--text-primary);
    background-color: var(--bg-light);
    border-left: 1px solid var(--border-color);
    width: 180px;
}

/* Interactive cell */
.teacher-cell {
    cursor: pointer;
    transition: var(--transition);
    border-radius: var(--radius-sm);
    font-weight: 500;
    position: relative;
}

.teacher-cell:hover {
    background-color: var(--primary-light);
    color: var(--primary-color);
}

.teacher-cell::after {
    content: "تعديل ✎";
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.75rem;
    color: var(--primary-color);
    opacity: 0;
    transition: var(--transition);
}

.teacher-cell:hover::after {
    opacity: 1;
}

/* TIMETABLE VIEW */
.timetable-bar {
    display: flex;
    align-items: flex-end;
    gap: 20px;
    background-color: var(--bg-card);
    padding: 16px 24px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.timetable-bar .form-group {
    margin-bottom: 0;
}

.timetable-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.timetable-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    transition: var(--transition);
    position: relative;
    border-top: 4px solid var(--primary-color);
}

.timetable-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.slot-day-time {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.slot-day {
    font-weight: 800;
    color: var(--text-primary);
}

.slot-time {
    font-family: var(--font-en);
    background-color: var(--bg-light);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--primary-color);
    direction: ltr;
}

.slot-subject-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 8px 0;
}

.slot-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: auto;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px dotted var(--border-color);
}

.empty-state h4 {
    font-size: 1.15rem;
    font-weight: 800;
}

/* ADMIN CENTER VIEW */
.grid-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.admin-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.admin-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-light);
}

.admin-item-info {
    display: flex;
    flex-direction: column;
}

.admin-item-email {
    font-weight: 700;
    font-family: var(--font-en);
    font-size: 0.95rem;
}

.admin-item-date {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* MODALS */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.modal-overlay:not(.hidden) {
    opacity: 1;
    pointer-events: auto;
}

.modal-card {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 480px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transform: translateY(20px);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.175);
}

.modal-overlay:not(.hidden) .modal-card {
    transform: translateY(0);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.15rem;
    font-weight: 800;
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.modal-card form {
    padding: 24px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
}

/* RESPONSIVE DESIGN */
@media (max-width: 1024px) {
    .grid-2col {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .dashboard-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
    }
    
    .sidebar-menu {
        flex-direction: row;
        padding: 12px;
        overflow-x: auto;
    }
    
    .nav-item {
        padding: 8px 12px;
        font-size: 0.85rem;
        white-space: nowrap;
    }
    
    .content-wrapper {
        padding: 20px;
    }
    
    .timetable-bar {
        flex-direction: column;
        align-items: stretch;
    }
}