* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

:root {
    --primary: #4361ee;
    --secondary: #3f37c9;
    --success: #4cc9f0;
    --warning: #f72585;
    --danger: #f44336;
    --dark: #1a1a2e;
    --light: #f8f9fa;
    --gray: #6c757d;
    --border: #e0e0e0;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
}

body {
    background: #f0f2f5;
    color: var(--dark);
    min-height: 100vh;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding: 20px;
    background: white;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.header-left h1 {
    font-size: 2rem;
    color: var(--primary);
}

.header-left h1 i {
    margin-right: 10px;
}

.subtitle {
    color: var(--gray);
    font-size: 0.9rem;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 15px;
    background: var(--light);
    border-radius: 8px;
}

.user-info i {
    font-size: 1.2rem;
    color: var(--primary);
}

.date-display {
    color: var(--gray);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 15px;
}

.stat-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.8rem;
}

.stat-info {
    flex: 1;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    color: var(--gray);
    margin-bottom: 5px;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--dark);
}

/* Action Bar */
.action-bar {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
}

.btn-primary, .btn-secondary {
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    background: var(--secondary);
    transform: translateY(-2px);
}

.btn-secondary {
    background: white;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.dashboard-card {
    background: white;
    border-radius: 15px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

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

.card-header h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--dark);
}

.search-box {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 15px;
    background: var(--light);
    border-radius: 8px;
}

.search-box i {
    color: var(--gray);
}

.search-box input {
    border: none;
    background: none;
    outline: none;
    font-size: 0.95rem;
}

.card-body {
    padding: 20px;
}

/* Students Card - Spans 2 columns */
.students-card {
    grid-column: span 2;
}

/* Table Styles */
.table-responsive {
    overflow-x: auto;
}

#studentsTable {
    width: 100%;
    border-collapse: collapse;
}

#studentsTable th {
    text-align: left;
    padding: 12px;
    background: var(--light);
    color: var(--dark);
    font-weight: 600;
}

#studentsTable td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
}

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

.status-badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.status-good {
    background: #d4edda;
    color: #155724;
}

.status-warning {
    background: #fff3cd;
    color: #856404;
}

.status-danger {
    background: #f8d7da;
    color: #721c24;
}

.action-buttons {
    display: flex;
    gap: 8px;
}

.action-btn {
    padding: 6px 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
}

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

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

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

/* Charts Card */
.charts-card {
    grid-column: span 1;
}

.chart-tabs {
    display: flex;
    gap: 10px;
}

.chart-tab {
    padding: 8px 15px;
    border: none;
    background: var(--light);
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.chart-tab.active {
    background: var(--primary);
    color: white;
}

.chart-container {
    height: 300px;
    position: relative;
}

/* Activity Card */
.activity-card {
    grid-column: span 1;
}

.activity-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-icon {
    width: 40px;
    height: 40px;
    background: var(--light);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.activity-content {
    flex: 1;
}

.activity-title {
    font-weight: 500;
    margin-bottom: 4px;
}

.activity-time {
    font-size: 0.8rem;
    color: var(--gray);
}

/* Quick Actions Card */
.quick-actions-card {
    grid-column: span 1;
}

.quick-actions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.quick-action-btn {
    padding: 20px;
    border: 2px solid var(--border);
    border-radius: 10px;
    background: white;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.quick-action-btn:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.quick-action-btn i {
    font-size: 2rem;
    color: var(--primary);
}

.quick-action-btn span {
    font-size: 0.9rem;
    font-weight: 500;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: white;
    margin: 50px auto;
    padding: 0;
    border-radius: 15px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 5px 30px rgba(0,0,0,0.3);
}

.modal-content.modal-lg {
    max-width: 800px;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background: white;
    z-index: 1;
}

.modal-header .close {
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--gray);
}

.modal-header .close:hover {
    color: var(--danger);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 15px;
    position: sticky;
    bottom: 0;
    background: white;
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin: 15px 0;
}

.subject-input label {
    font-size: 0.9rem;
    margin-bottom: 3px;
}

.attendance-input {
    margin: 15px 0;
}

/* Report Styles */
.report-section {
    margin-bottom: 30px;
}

.report-section h3 {
    margin-bottom: 15px;
    color: var(--primary);
}

.report-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

.report-table th,
.report-table td {
    padding: 10px;
    border: 1px solid var(--border);
    text-align: left;
}

.report-table th {
    background: var(--light);
}

.summary-box {
    background: var(--light);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
}

.summary-box p {
    margin: 5px 0;
}

/* Footer */
footer {
    margin-top: 40px;
    padding: 20px;
    text-align: center;
    background: white;
    border-radius: 10px;
    color: var(--gray);
}

.footer-content .small {
    font-size: 0.8rem;
    margin-top: 5px;
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .students-card,
    .charts-card,
    .activity-card,
    .quick-actions-card {
        grid-column: span 1;
    }
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .action-bar {
        flex-wrap: wrap;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .subjects-grid {
        grid-template-columns: 1fr;
    }
    
    .quick-actions-grid {
        grid-template-columns: 1fr;
    }
}