:root {
    --primary-color: #007bff;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

.bg-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.login-card {
    border: none;
    border-radius: 15px;
    background: white;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2) !important;
}

.form-control {
    border-radius: 8px;
    border: 2px solid #e9ecef;
    padding: 10px 15px;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.15);
}

.btn {
    border-radius: 8px;
    font-weight: 600;
    padding: 10px 20px;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

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

.btn-success:hover {
    background-color: #218838;
    border-color: #218838;
}

.alert {
    border-radius: 8px;
    border-left: 4px solid;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.subject-card {
    border: none;
    border-radius: 12px;
    transition: all 0.3s ease;
    border-top: 4px solid var(--primary-color);
}

.subject-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1) !important;
}

.subject-card h5 {
    color: var(--dark-color);
    font-weight: 600;
    margin-bottom: 8px;
}

.progress {
    background-color: #e9ecef;
    border-radius: 10px;
    height: 25px;
}

.progress-bar {
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    font-weight: 600;
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.navbar {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
}

.card {
    border: none;
    border-radius: 12px;
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1) !important;
}

.card-title {
    color: var(--dark-color);
    font-weight: 600;
    margin-bottom: 15px;
}

.table {
    border-radius: 8px;
    overflow: hidden;
}

.table-dark {
    background-color: var(--dark-color) !important;
}

.table tbody tr {
    transition: all 0.3s ease;
}

.table tbody tr:hover {
    background-color: rgba(102, 126, 234, 0.1);
}

.badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-weight: 500;
}

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

.badge.bg-warning {
    background-color: var(--warning-color) !important;
    color: #000;
}

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

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

.modal-content {
    background: white;
    border-radius: 12px;
    padding: 20px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@media (max-width: 768px) {
    .col-md-4 {
        flex: 0 0 100%;
    }

    .login-card {
        margin: 20px;
    }

    .card-body {
        padding: 15px;
    }

    .btn {
        padding: 8px 15px;
        font-size: 0.9rem;
    }

    .navbar-brand {
        font-size: 1.2rem;
    }

    .table-sm {
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .container-fluid {
        padding: 10px;
    }

    .card-body {
        padding: 12px;
    }

    h2 {
        font-size: 1.5rem;
    }

    .progress {
        height: 20px;
    }

    .badge {
        padding: 4px 8px;
        font-size: 0.8rem;
    }
}

.text-primary {
    color: var(--primary-color) !important;
}

.text-success {
    color: var(--success-color) !important;
}

.text-danger {
    color: var(--danger-color) !important;
}

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

.fade {
    animation: fadeInOut 0.5s ease;
}

@keyframes fadeInOut {
    0%, 100% {
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
}