:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2c3e50;
    --secondary-light: #34495e;
    --success-color: #2ecc71;
    --danger-color: #e74c3c;
    --warning-color: #f1c40f;
    --info-color: #1abc9c;
    --purple-color: #9b59b6;
    --light-bg: #f5f7fa;
    --white: #ffffff;
    --text-color: #333333;
    --text-muted: #7f8c8d;
    --border-color: #e0e0e0;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --radius: 8px;
    --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-main);
    margin: 0;
    padding: 0;
    background-color: var(--light-bg);
    color: var(--text-color);
    line-height: 1.6;
}

/* Layout */
.dashboard-wrapper {
    display: flex;
    min-height: 100vh;
    position: relative;
}

.main-content {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
    height: 100vh;
    background-color: var(--light-bg);
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--secondary-color);
    color: #ecf0f1;
    transition: all 0.3s ease;
    flex-shrink: 0;
    height: 100vh;
    overflow-y: auto;
    box-shadow: 2px 0 5px rgba(0,0,0,0.05);
    z-index: 100;
}

.sidebar-toggle {
    display: none;
}

.close-sidebar {
    display: none;
}

.sidebar .brand {
    padding: 24px;
    text-align: center;
    background-color: var(--info-color);
    color: white;
}

.sidebar .brand h2 {
    margin: 0;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar ul li {
    border-bottom: 1px solid var(--secondary-light);
}

.sidebar ul li a {
    display: block;
    padding: 16px 24px;
    color: #ecf0f1;
    text-decoration: none;
    transition: background 0.3s, padding-left 0.3s;
    font-weight: 500;
}

.sidebar ul li a:hover {
    background-color: var(--secondary-light);
    padding-left: 28px;
}

/* Submenu */
.has-submenu > a {
    position: relative;
    cursor: pointer;
}

.has-submenu > a::after {
    content: '▼';
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.7em;
    opacity: 0.7;
    transition: transform 0.3s;
}

.submenu {
    display: none;
    background: #1a252f;
    padding: 0;
}

.submenu.open {
    display: block;
}

.submenu li a {
    padding-left: 40px;
    font-size: 0.9em;
    background: #1a252f;
    border-bottom: 1px solid #2c3e50;
}

.submenu li a:hover {
    background: #0d1217;
    padding-left: 44px;
}

/* Top Bar */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--white);
    padding: 16px 24px;
    margin-bottom: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.top-bar h3 {
    margin: 0;
    color: var(--secondary-color);
    font-weight: 600;
}

/* Dashboard Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 30px;
}

.stat-card {
    background-color: var(--white);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-left: 5px solid transparent;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.stat-card h3 {
    margin: 0 0 12px 0;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.stat-card .number {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--secondary-color);
}

/* Card Accents & Details */
.card-accent-success { border-left-color: var(--success-color); }
.card-accent-danger { border-left-color: var(--danger-color); }
.card-accent-warning { border-left-color: var(--warning-color); }
.card-accent-info { border-left-color: var(--info-color); }
.card-accent-purple { border-left-color: var(--purple-color); }

.card-details {
    margin-top: 16px;
    font-size: 0.9rem;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    align-items: center;
}

.card-divider {
    border: 0;
    border-top: 1px solid var(--border-color);
    margin: 12px 0;
}

.detail-note {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: right;
    margin-top: 8px;
    font-style: italic;
}

.card-link {
    margin-top: 10px;
}

.card-link a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.2s;
    display: inline-flex;
    align-items: center;
}

.card-link a:hover {
    color: var(--primary-color);
}

.text-success { color: var(--success-color); }
.text-danger { color: var(--danger-color); }
.text-info { color: var(--info-color); }
.text-large { font-size: 1.1em; }
.unit { font-size: 0.5em; color: var(--text-muted); vertical-align: middle; }

/* Charts */
.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
    margin-bottom: 30px;
}

.chart-card {
    background-color: var(--white);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s ease;
}

.chart-card:hover {
    box-shadow: var(--shadow-md);
}

.chart-card h3 {
    text-align: center;
    color: var(--secondary-color);
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.chart-card canvas {
    max-width: 100%;
}

/* Dashboard Cards (Quick Actions etc) */
.dashboard-card {
    background-color: var(--white);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
}

.dashboard-card h3 {
    margin-top: 0;
    margin-bottom: 20px;
    color: var(--secondary-color);
    font-size: 1.2rem;
}

/* Quick Actions Grid */
.quick-actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
}

.quick-action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background-color: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--secondary-color);
    transition: all 0.3s ease;
    text-align: center;
}

.quick-action-btn:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.quick-action-btn .icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.quick-action-btn .text {
    font-weight: 600;
    font-size: 0.95rem;
}

/* Forms */
.content-card {
    background-color: var(--white);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--secondary-color);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

button, .button {
    cursor: pointer;
    border: none;
    border-radius: var(--radius);
    font-family: inherit;
    transition: all 0.3s;
}

/* Form Grid */
.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.form-full-width {
    grid-column: span 2;
}

.form-actions {
    grid-column: span 2;
    text-align: right;
    margin-top: 10px;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-top: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--white);
    white-space: nowrap;
}

.data-table th, 
.data-table td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--light-bg);
}

.data-table th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: var(--secondary-color);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
}

.data-table tbody tr:hover {
    background-color: #fcfcfc;
}

/* Buttons & Badges */
.status-badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    display: inline-block;
}

.status-success { background-color: #d4edda; color: #155724; }
.status-warning { background-color: #fff3cd; color: #856404; }
.status-danger, .alert-error { background-color: #f8d7da; color: #721c24; }

.badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.9em;
    font-weight: 500;
    display: inline-block;
}

.badge-info {
    background-color: #e0f7fa;
    color: #006064;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    border-radius: var(--radius);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    margin-right: 8px;
    transition: all 0.3s ease;
}

.edit-btn {
    background-color: #e3f2fd;
    color: #1976d2;
}

.edit-btn:hover {
    background-color: #bbdefb;
    color: #1565c0;
}

.delete-btn {
    background-color: #ffebee;
    color: #c62828;
}

.delete-btn:hover {
    background-color: #ffcdd2;
    color: #b71c1c;
}

/* Login Page Styles */
.login-body {
    min-height: 100vh;
    margin: 0;
    display: flex;
    flex-direction: column;
}

.split-container {
    display: flex;
    flex: 1;
    width: 100%;
    min-height: 100vh;
}

.school-column {
    flex: 1;
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    padding: 40px;
    text-align: center;
}

.school-column img {
    max-width: 150px;
    margin-bottom: 30px;
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.2));
}

.school-column h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.form-column {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--white);
    padding: 40px;
}

.login-form {
    width: 100%;
    max-width: 400px;
    padding: 40px;
}

.login-form h2 {
    margin-top: 0;
    color: var(--secondary-color);
    margin-bottom: 30px;
    font-size: 2rem;
    text-align: center;
}

.login-form button {
    width: 100%;
    padding: 14px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    margin-top: 20px;
    transition: background 0.3s;
}

.login-form button:hover {
    background-color: var(--primary-dark);
}

/* Mobile Responsive */
@media (max-width: 992px) {
    .charts-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .dashboard-wrapper {
        flex-direction: column;
    }

    .sidebar-toggle {
        display: block;
        position: fixed;
        top: 10px;
        left: 10px;
        z-index: 200;
        background-color: var(--secondary-color);
        color: #ecf0f1;
        border: none;
        padding: 8px 12px;
        border-radius: 4px;
        font-size: 1.2rem;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: 260px;
        height: 100vh;
        max-height: 100vh;
        box-shadow: 2px 0 5px rgba(0,0,0,0.2);
        border-bottom: none;
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }
    
    .close-sidebar {
        display: block;
        background: transparent;
        border: none;
        color: #ecf0f1;
        font-size: 1.4rem;
        cursor: pointer;
    }

    .sidebar ul {
        display: block;
        overflow-x: visible;
        white-space: normal;
    }

    .sidebar ul li {
        border-right: none;
        border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    
    .sidebar ul li a {
        padding: 15px 20px;
        font-size: 0.9rem;
    }
    
    .main-content {
        padding: 16px;
        height: auto;
        overflow-y: visible;
        margin-left: 0;
        padding-top: 56px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .form-full-width, .form-actions {
        grid-column: span 1;
    }
    
    .split-container {
        flex-direction: column;
    }
    
    .school-column {
        padding: 40px 20px;
        min-height: 200px;
    }
    
    .form-column {
        padding: 20px;
    }
    
    .quick-actions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .quick-actions-grid {
        grid-template-columns: 1fr;
    }
    
    .top-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .stat-card .number {
        font-size: 1.8rem;
    }
}

/* Alerts */
.alert {
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid transparent;
    border-radius: var(--radius);
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert-danger, .alert-error {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}