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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

/* Dashboard body override */
body.dashboard-body {
    display: block;
    padding: 0;
    background: #f5f7fa;
}

/* Login Container */
.login-container {
    width: 100%;
    max-width: 450px;
}

.login-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    padding: 40px;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Header */
.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    color: #667eea;
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
}

.login-header p {
    color: #666;
    font-size: 16px;
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-danger {
    background: #fee;
    color: #c33;
    border: 1px solid #fcc;
}

.alert-success {
    background: #efe;
    color: #3c3;
    border: 1px solid #cfc;
}

.alert-info {
    background: #e7f3ff;
    color: #0066cc;
    border: 1px solid #b3d9ff;
}

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

.form-row {
    display: flex;
    gap: 10px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 500;
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 16px;
    transition: all 0.3s;
    outline: none;
    -webkit-appearance: none;
}

.form-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-text {
    display: block;
    margin-top: 5px;
    font-size: 12px;
    color: #666;
}

select.form-control {
    cursor: pointer;
    background-color: white;
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    -webkit-appearance: none;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-danger {
    background: #dc3545;
    color: white;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

.btn-block {
    display: block;
    width: 100%;
}

/* Links */
a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: #764ba2;
    text-decoration: underline;
}

/* Text Utilities */
.text-center {
    text-align: center;
}

.mt-3 {
    margin-top: 20px;
}

.mb-3 {
    margin-bottom: 20px;
}

/* Dashboard Styles */
.dashboard-container {
    background: #f5f7fa;
    min-height: 100vh;
}

.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px 20px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-size: 18px;
    font-weight: 700;
}

.navbar-menu {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    font-size: 14px;
}

.navbar-menu a {
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.15);
    transition: background 0.3s;
}

.navbar-menu a:hover {
    background: rgba(255, 255, 255, 0.25);
    text-decoration: none;
}

.content {
    padding: 15px;
    max-width: 1400px;
    margin: 0 auto;
}

.content h1 {
    font-size: 22px;
    margin-bottom: 20px;
    color: #333;
}

/* Cards */
.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    margin-bottom: 20px;
    overflow: hidden;
}

.card-header {
    font-size: 16px;
    font-weight: 600;
    color: #333;
    padding: 15px 20px;
    background: #f8f9fa;
    border-bottom: 1px solid #eee;
}

.card-body {
    padding: 20px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 25px;
}

.stat-card {
    background: white;
    padding: 20px 15px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.stat-value {
    font-size: 32px;
    font-weight: bold;
    color: #667eea;
    margin-bottom: 5px;
}

.stat-label {
    color: #666;
    font-size: 13px;
    font-weight: 600;
}

/* Tables - Responsive */
.table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table {
    width: 100%;
    border-collapse: collapse;
    min-width: 500px;
}

.table th,
.table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
    font-size: 14px;
}

.table th {
    background: #f8f9fa;
    font-weight: 600;
    color: #555;
    white-space: nowrap;
}

.table tr:hover {
    background: #f8f9fa;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 5px 12px;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 600;
}

.badge-admin {
    background: #ffc107;
    color: #000;
}

.badge-teacher {
    background: #667eea;
    color: white;
}

.badge-student {
    background: #28a745;
    color: white;
}

/* Status */
.status-active {
    color: #28a745;
    font-weight: 600;
}

.status-inactive {
    color: #dc3545;
    font-weight: 600;
}

/* Empty states */
.empty-message {
    padding: 40px 20px;
    text-align: center;
    color: #666;
}

/* Responsive */
@media (min-width: 600px) {
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 768px) {
    .content {
        padding: 25px;
    }
    
    .content h1 {
        font-size: 28px;
    }
    
    .stat-value {
        font-size: 36px;
    }
}

@media (min-width: 900px) {
    .stats-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: 25px 20px;
    }
    
    .btn {
        padding: 14px 20px;
        width: 100%;
    }
}