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

:root {
    --primary-color: #4a90e2;
    --secondary-color: #50c878;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --success-color: #27ae60;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --border-color: #ddd;
    --text-color: #333;
    --bg-color: #f8f9fa;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    flex: 1;
}

/* Навигация */
.navbar {
    background-color: var(--dark-color);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    color: white;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-user {
    color: rgba(255,255,255,0.8);
}

/* Кнопки */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    text-decoration: none;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: #357abd;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

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

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

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

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

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
}

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

/* Формы */
.form-container {
    max-width: 600px;
    margin: 2rem auto;
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* Вход */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 200px);
}

.login-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
}

.login-card h1 {
    margin-bottom: 1.5rem;
    text-align: center;
}

.login-info {
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: var(--light-color);
    border-radius: 4px;
    font-size: 0.9rem;
}

/* Уведомления */
.flash-messages {
    margin: 1rem 0;
}

.alert {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

/* Таблицы */
.table-container {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    overflow-x: auto;
    margin: 1rem 0;
}

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

.data-table th,
.data-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background-color: var(--light-color);
    font-weight: 600;
}

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

/* Бейджи */
.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
}

.badge-success {
    background-color: var(--success-color);
    color: white;
}

.badge-danger {
    background-color: var(--danger-color);
    color: white;
}

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

.badge-admin {
    background-color: #9b59b6;
    color: white;
}

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

.badge-student {
    background-color: var(--secondary-color);
    color: white;
}

/* Дашборд */
.dashboard {
    padding: 2rem 0;
}

.dashboard h1 {
    margin-bottom: 2rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    text-align: center;
}

.stat-card h3 {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.stat-success {
    color: var(--success-color);
}

.stat-danger {
    color: var(--danger-color);
}

.dashboard-menu {
    margin-top: 2rem;
}

.dashboard-item {
    display: block;
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    text-decoration: none;
    color: inherit;
    margin-bottom: 1rem;
    transition: transform 0.2s;
}

.dashboard-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.dashboard-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.dashboard-item p {
    color: #666;
    font-size: 0.9rem;
}

/* Список предметов и групп */
.subjects-list,
.groups-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.subject-card,
.group-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.subject-card h3,
.group-card h3 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.subject-card p,
.group-card p {
    color: #666;
    margin-bottom: 0.5rem;
}

.card-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

/* Секции */
.section {
    margin: 2rem 0;
}

.section h2 {
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.subjects-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

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

.form-inline {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
    margin-bottom: 1.5rem;
}

.form-inline .form-control {
    flex: 1;
    min-width: 200px;
}

/* Заголовок страницы */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.page-header h1 {
    margin: 0;
}

/* Информационный блок */
.info-box {
    background: var(--light-color);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.info-box h3 {
    margin-bottom: 1rem;
}

.info-box ul {
    margin-left: 2rem;
    margin-top: 0.5rem;
}

.info-box pre {
    background: white;
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
    margin-top: 1rem;
}

/* Футер */
.footer {
    background-color: var(--dark-color);
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: auto;
}

.footer p {
    margin: 0;
}

/* Адаптивность */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .subjects-list,
    .groups-list {
        grid-template-columns: 1fr;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .data-table {
        font-size: 0.9rem;
    }
}