/**
 * School Management System - Main Stylesheet
 * Modern and Responsive Design
 */

:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --secondary: #06b6d4;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --dark: #1f2937;
    --light: #f9fafb;
    --gray: #6b7280;
    --white: #ffffff;
    --border: #e5e7eb;
    --golden: linear-gradient(130deg, #78350f 0%, #f59e0b 55%, #78350f 100%);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--light);
    color: var(--dark);
    line-height: 1.6;
}

/* Sidebar Styles */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    width: 260px;
    background: linear-gradient(180deg, #4f46e5 0%, #4338ca 100%);
    color: white;
    transition: all 0.3s;
    overflow-y: auto;
    z-index: 1000;
    box-shadow: 4px 0 10px rgba(0, 0, 0, 0.1);
}

.sidebar-header {
    padding: 2rem 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.sidebar-header p {
    font-size: 0.875rem;
    opacity: 0.8;
    margin: 0.25rem 0 0;
}

.sidebar-menu {
    list-style: none;
    padding: 1rem 0;
}

.sidebar-menu li {
    margin: 0.25rem 0;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    padding: 0.875rem 1.5rem;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: all 0.3s;
    border-left: 3px solid transparent;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
    background: rgba(255, 255, 255, 0.1);
    border-left-color: white;
    color: white;
}

.sidebar-menu a i {
    margin-right: 0.75rem;
    font-size: 1.125rem;
    width: 24px;
}

/* Main Content */
.main-content {
    margin-left: 260px;
    padding: 2rem;
    min-height: 100vh;
    transition: margin-left 0.3s;
}

/* Navbar */
.navbar {
    background: linear-gradient(135deg, #cdd0dc, #ffffff); 
    padding: 1rem 2rem;
    margin: -2rem -2rem 2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-left h4 {
    margin: 0;
    color: var(--dark);
    font-size: 1.5rem;
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    transition: background 0.3s;
}

.user-profile:hover {
    background: var(--light);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

/* Cards */
.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    margin-bottom: 1.5rem;
    overflow: hidden;
    transition: all 0.3s;
    border: 2px solid var(--border);
}
.card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
            border-color: var(--primary);
        }
        

.card-header {
    background: linear-gradient(135deg, #667eea, #764ba2); 
    color:#ffffff;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    font-size: 1.125rem;
}

.card-body {
    padding: 1.5rem;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform 0.3s, box-shadow 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-icon.primary { background: linear-gradient(135deg, #4f46e5, #6366f1); color: white; }
.stat-icon.success { background: linear-gradient(135deg, #10b981, #34d399); color: white; }
.stat-icon.warning { background: linear-gradient(135deg, #f59e0b, #fbbf24); color: white; }
.stat-icon.danger { background: linear-gradient(135deg, #ef4444, #f87171); color: white; }

.stat-details h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0;
}

.stat-details p {
    color: var(--gray);
    margin: 0.25rem 0 0;
    font-size: 0.875rem;
}

/* Tables */
.table-container {
    overflow-x: auto;
}

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

thead {
    background: var(--light);
}

th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--dark);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

tbody tr:hover {
    background: var(--light);
}

/* Buttons */
.btn {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
    font-size: 0.875rem;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

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

.btn-success:hover {
    background: #059669;
}

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

.btn-danger:hover {
    background: #dc2626;
}

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

.btn-secondary:hover {
    background: #4b5563;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.9375rem;
    transition: all 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

select.form-control {
    cursor: pointer;
}

/* Badges */
.badge {
    padding: 0.375rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-block;
}

.badge-success { background: #d1fae5; color: #065f46; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-info { background: #dbeafe; color: #1e40af; }
.badge-primary { background: #e0e7ff; color: #3730a3; }

/* Alerts */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid var(--success);
}

.alert-danger {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--danger);
}

.alert-info {
    background: #dbeafe;
    color: #1e40af;
    border-left: 4px solid var(--info);
}

/* Loading Spinner */
.spinner {
    border: 3px solid var(--border);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 2rem auto;
}

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

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 0.5rem;
    background: none;
    border: none;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--dark);
    margin: 3px 0;
    transition: all 0.3s;
    border-radius: 3px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Sidebar Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

.sidebar-overlay.active {
    display: block;
}

/* Responsive */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .sidebar {
        transform: translateX(-100%);
        z-index: 1000;
    }
    
    .sidebar.active {
        transform: translateX(0);
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.3);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .navbar {
        padding: 1rem;
    }
    
    .navbar-left {
        display: flex;
        align-items: center;
        gap: 1rem;
    }
    
    .navbar-right {
        flex-wrap: wrap;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.d-flex { display: flex; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }

        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 9999;
            align-items: center;
            justify-content: center;
        }
        .modal.active { display: flex; }
        .modal-content {
            background: white;
            border-radius: 15px;
            max-width: 600px;
            width: 90%;
            max-height: 90vh;
            overflow-y: auto;
        }
        .modal-header {
            background: linear-gradient(135deg, #10b981, #34d399);
            color: white;
            padding: 1.5rem;
            border-radius: 15px 15px 0 0;
        }
        .modal-body { padding: 2rem; }
        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
        }

        /* Enhanced Sidebar with Submenu Support */
.sidebar-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-menu > li {
    margin-bottom: 0.25rem;
}

.sidebar-menu > li > a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.3s ease;
    border-radius: 8px;
    margin: 0 0.5rem;
}

.sidebar-menu > li > a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transform: translateX(5px);
}

.sidebar-menu > li > a.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.sidebar-menu > li > a i {
    margin-right: 0.75rem;
    width: 20px;
    text-align: center;
}

/* Submenu Parent Item */
.sidebar-menu > li.has-submenu > a {
    cursor: pointer;
}

.sidebar-menu > li.has-submenu > a .submenu-arrow {
    transition: transform 0.3s ease;
    font-size: 0.75rem;
    opacity: 0.7;
}

.sidebar-menu > li.has-submenu.open > a .submenu-arrow {
    transform: rotate(180deg);
}

/* Submenu Container */
.submenu {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.3s ease;
    opacity: 0;
    background: rgba(0, 0, 0, 0.15);
    border-radius: 8px;
    margin: 0.25rem 0.5rem 0.5rem 0.5rem;
}

.sidebar-menu > li.has-submenu.open .submenu {
    max-height: 500px;
    opacity: 1;
    padding: 0.5rem 0;
}

/* Submenu Items */
.submenu li {
    margin: 0;
}

.submenu li a {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem 0.75rem 3rem;
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    position: relative;
}

.submenu li a::before {
    content: '';
    position: absolute;
    left: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    transition: all 0.3s ease;
}

.submenu li a:hover {
    background: rgba(255, 255, 255, 0.08);
    color: white;
    padding-left: 3.25rem;
}

.submenu li a:hover::before {
    background: white;
    transform: translateY(-50%) scale(1.3);
}

.submenu li a.active {
    background: rgba(102, 126, 234, 0.2);
    color: white;
    font-weight: 600;
    border-left: 3px solid #667eea;
}

.submenu li a.active::before {
    background: #667eea;
    transform: translateY(-50%) scale(1.5);
}

.submenu li a i {
    font-size: 0.75rem;
    margin-right: 0.75rem;
    opacity: 0.8;
    width: 16px;
    text-align: center;
}

/* Badge for notifications */
.menu-badge {
    background: #ef4444;
    color: white;
    font-size: 0.7rem;
    padding: 0.15rem 0.4rem;
    border-radius: 10px;
    font-weight: 600;
    margin-left: 0.5rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .submenu li a {
        padding-left: 2.5rem;
        font-size: 0.85rem;
    }
    
    .submenu li a::before {
        left: 1rem;
    }
}

   .quick-action-card {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s;
            border: 2px solid var(--border);
        }
        .quick-action-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
            border-color: var(--primary);
        }
        .quick-action-icon {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.5rem;
            margin: 0 auto 1rem;
        }

        /* Hide mobile row by default */
.mobile-row {
    display: none;
}

/* Avatar */
.avatar-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

/* Mobile card styling */
.mobile-card {
    background: #ffffff;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.mobile-top {
    display: flex;
    gap: 10px;
    align-items: center;
}

.mobile-actions {
    margin-top: 10px;
}

/* MOBILE VIEW */
@media (max-width: 768px) {

    .desktop-row {
        display: none;
    }

    .mobile-row {
        display: table-row;
    }

    .responsive-table thead {
        display: none;
    }

}