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

:root {
    --primary-color: #4a90e2;
    --primary-dark: #357abd;
    --secondary-color: #50c878;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --success-color: #27ae60;
    --bg-color: #f5f6fa;
    --card-bg: #ffffff;
    --text-color: #2c3e50;
    --text-muted: #7f8c8d;
    --border-color: #dfe6e9;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 20px rgba(0,0,0,0.15);
    --sidebar-width: 250px;
    --header-height: 70px;
}

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

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    height: var(--header-height);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 30px;
    height: 100%;
}

.header h1 {
    font-size: 24px;
    font-weight: 600;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-info span {
    font-size: 14px;
}

/* Main Container */
.main-container {
    display: flex;
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--card-bg);
    border-right: 1px solid var(--border-color);
    position: fixed;
    left: 0;
    top: var(--header-height);
    bottom: 0;
    overflow-y: auto;
    box-shadow: 2px 0 10px rgba(0,0,0,0.05);
}

.nav-menu {
    padding: 20px 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px 25px;
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background-color: #f8f9fa;
    border-left-color: var(--primary-color);
}

.nav-item.active {
    background-color: #e3f2fd;
    border-left-color: var(--primary-color);
    color: var(--primary-color);
    font-weight: 600;
}

.nav-icon {
    font-size: 20px;
}

/* Content Area */
.content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 30px;
    overflow-y: auto;
}

.section {
    display: none;
}

.section.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.section h2 {
    font-size: 28px;
    color: var(--text-color);
    margin-bottom: 20px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.stat-icon {
    font-size: 48px;
    opacity: 0.8;
}

.stat-info h3 {
    font-size: 36px;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-info p {
    color: var(--text-muted);
    font-size: 14px;
}

/* Recent Activity */
.recent-activity {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-top: 20px;
}

.recent-activity h3 {
    margin-bottom: 20px;
    color: var(--text-color);
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.activity-item {
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.activity-item .activity-time {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 5px;
}

.activity-item .activity-text {
    color: var(--text-color);
}

/* Filters */
.filters {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.search-input,
.filter-select,
.filter-input {
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.search-input {
    flex: 1;
    min-width: 250px;
}

.filter-select,
.filter-input {
    min-width: 150px;
}

.search-input:focus,
.filter-select:focus,
.filter-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Tables */
.table-container {
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 20px;
}

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

.data-table thead {
    background-color: #f8f9fa;
}

.data-table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: var(--text-color);
    border-bottom: 2px solid var(--border-color);
    font-size: 14px;
    text-transform: uppercase;
}

.data-table td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
}

.data-table tbody tr {
    transition: background-color 0.2s ease;
}

.data-table tbody tr:hover {
    background-color: #f8f9fa;
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-danger,
.btn-success,
.btn-warning,
.btn-logout {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
}

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

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
    padding: 8px 15px;
    font-size: 13px;
}

.btn-danger:hover {
    background-color: #c0392b;
}

.btn-success {
    background-color: var(--success-color);
    color: white;
    padding: 8px 15px;
    font-size: 13px;
}

.btn-success:hover {
    background-color: #229954;
}

.btn-warning {
    background-color: var(--warning-color);
    color: white;
    padding: 8px 15px;
    font-size: 13px;
}

.btn-warning:hover {
    background-color: #d68910;
}

.btn-logout {
    background-color: transparent;
    color: white;
    border: 1px solid white;
}

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

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

/* Badges */
.badge {
    display: inline-block;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-success {
    background-color: #d4edda;
    color: #155724;
}

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

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

.badge-info {
    background-color: #d1ecf1;
    color: #0c5460;
}

.badge-secondary {
    background-color: #e2e3e5;
    color: #383d41;
}

/* Note List */
.note-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.note-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
}

.note-card.tipo-disciplinare {
    border-left-color: var(--danger-color);
}

.note-card.tipo-didattica {
    border-left-color: var(--warning-color);
}

.note-card.tipo-comportamento {
    border-left-color: var(--primary-color);
}

.note-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.note-student {
    font-weight: 600;
    font-size: 16px;
}

.note-badges {
    display: flex;
    gap: 8px;
}

.note-meta {
    display: flex;
    gap: 15px;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.note-description {
    color: var(--text-color);
    margin-top: 10px;
}

.note-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

/* Materie Grid */
.materie-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.materia-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.materia-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.materia-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-color);
}

.materia-description {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 15px;
}

.materia-actions {
    display: flex;
    gap: 10px;
}

/* Averages Section */
.averages-section {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-top: 20px;
}

.averages-section h3 {
    margin-bottom: 20px;
    color: var(--text-color);
}

.medie-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
}

.media-card {
    background-color: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.media-materia {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 5px;
}

.media-valore {
    font-size: 24px;
    color: var(--primary-color);
    font-weight: 600;
}

.media-valore.excellent {
    color: var(--success-color);
}

.media-valore.good {
    color: var(--primary-color);
}

.media-valore.average {
    color: var(--warning-color);
}

.media-valore.poor {
    color: var(--danger-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--card-bg);
    border-radius: 10px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 25px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    color: var(--text-color);
    font-size: 20px;
}

.close {
    font-size: 28px;
    font-weight: 300;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.3s ease;
}

.close:hover {
    color: var(--text-color);
}

.modal form {
    padding: 25px;
}

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

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
    font-weight: 500;
    font-size: 14px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    margin-top: 20px;
}

/* Loading */
.loading {
    text-align: center;
    color: var(--text-muted);
    padding: 20px;
    font-style: italic;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        position: relative;
        top: 0;
    }

    .content {
        margin-left: 0;
    }

    .main-container {
        flex-direction: column;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .filters {
        flex-direction: column;
    }

    .search-input,
    .filter-select,
    .filter-input {
        width: 100%;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .table-container {
        overflow-x: auto;
    }

    .materie-grid {
        grid-template-columns: 1fr;
    }

    .medie-grid {
        grid-template-columns: 1fr;
    }
}