/* Основные стили */
:root {
    --primary-color: #4a6baf;
    --primary-dark: #3a5a9f;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --body-bg: #f5f8fa;
    --card-bg: #ffffff;
    --border-color: #dee2e6;
    --text-color: #333333;
    --text-muted: #6c757d;
}

/* Стили для сетки проектов */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

/* Стили для сетки пользователей */
.users-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.teachers-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

/* Стили для карточки пользователя */
.user-card {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.user-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    overflow: hidden;
    margin-bottom: 15px;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    background-color: #3498db;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-weight: bold;
}

.user-info {
    margin-bottom: 15px;
}

.user-info h3 {
    margin: 0 0 5px;
    font-size: 18px;
}

.user-username {
    color: #666;
    margin: 0;
    font-size: 14px;
}

/* Дополнительные стили для секций */
.featured-projects,
.featured-students,
.featured-teachers {
    padding: 40px 0;
}

.featured-students {
    background-color: #f9f9f9;
}

.text-center {
    text-align: center;
}

.mt-4 {
    margin-top: 20px;
}

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

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Типография */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: 0.5rem;
    font-weight: 600;
    line-height: 1.2;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Шапка */
header {
    background-color: var(--card-bg);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    padding: 1rem 0;
    margin-bottom: 2rem;
}

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

.logo h1 {
    font-size: 1.5rem;
    margin: 0;
    color: var(--primary-color);
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 1.5rem;
}

nav ul li a {
    color: var(--text-color);
    font-weight: 500;
	font-size: 18px;
}

nav ul li a.active {
    color: var(--primary-color);
    font-weight: 600;
}

/* Подвал */
footer {
    background-color: var(--card-bg);
    padding: 1.5rem 0;
    margin-top: 3rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Кнопки */
.btn {
    display: inline-block;
    font-weight: 500;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 1px solid transparent;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 0.25rem;
    transition: all 0.15s ease-in-out;
    cursor: pointer;
    text-decoration: none;
}

.btn:hover {
    text-decoration: none;
}

.btn.primary {
    color: #fff;
    background-color:var(--primary-dark);
    border-color: var(--primary-color);
}
.btn.primaryy {
    color: #fff;
    background-color:#ffffff;
    border-color: var(--primary-color);
}

.btn.primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
}

.btn.secondary {
    color: #fff;
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.btn.secondary:hover {
    background-color: #5a6268;
    border-color: #545b62;
}

.btn.small {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    line-height: 1.5;
    border-radius: 0.2rem;
}

/* Формы */
.form-group {
    margin-bottom: 1rem;
}

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

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group textarea,
.form-group select {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-color);
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out;
}

.form-group textarea {
    resize: vertical;
}

.form-group input[type="file"] {
    display: block;
    width: 100%;
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.radio-group {
    display: flex;
    gap: 1rem;
}

.radio-group label {
    display: flex;
    align-items: center;
    font-weight: normal;
    margin-bottom: 0;
}

.radio-group input[type="radio"] {
    margin-right: 0.5rem;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 1.5rem;
}

.form-footer {
    margin-top: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
}

/* Карточки */
.card {
    background-color: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.card-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(0, 0, 0, 0.02);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h3 {
    margin: 0;
    font-size: 1.25rem;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background-color: rgba(0, 0, 0, 0.02);
}

/* Сообщения */
.success-message,
.error-message {
    padding: 1rem;
    border-radius: 0.25rem;
    margin-bottom: 1.5rem;
}

.success-message {
    background-color: rgba(40, 167, 69, 0.1);
    border: 1px solid rgba(40, 167, 69, 0.2);
    color: var(--success-color);
}

.error-message {
    background-color: rgba(220, 53, 69, 0.1);
    border: 1px solid rgba(220, 53, 69, 0.2);
    color: var(--danger-color);
}

.error-message ul {
    margin: 0;
    padding-left: 1.5rem;
}

/* Главная страница */
.hero {
    text-align: center;
    padding: 3rem 0;
    margin-bottom: 3rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: 0.5rem;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.features {
    padding: 3rem 0;
}

.features h2 {
    text-align: center;
    margin-bottom: 2.5rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.how-it-works {
    padding: 3rem 0;
    background-color: var(--light-color);
    margin: 3rem 0;
}

.how-it-works h2 {
    text-align: center;
    margin-bottom: 2.5rem;
}

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

.step {
    text-align: center;
}

.step-number {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 3rem;
    height: 3rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
    font-weight: bold;
}

.step h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

/* Страница авторизации и регистрации */
.auth-section {
    padding: 2rem 0;
}

.auth-form-container {
    max-width: 500px;
    margin: 0 auto;
    background-color: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    padding: 2rem;
}

.auth-form-container h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-form {
    margin-top: 1.5rem;
}

/* Профиль */
.profile-header {
    background-color: var(--card-bg);
    padding: 2rem 0;
    margin-bottom: 2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.profile-info {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.profile-photo {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    overflow: hidden;
    background-color: var(--light-color);
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.no-photo {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--primary-color);
    color: white;
    font-size: 4rem;
    font-weight: bold;
}

.profile-details h2 {
    margin-bottom: 0.5rem;
}

.role-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

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

.role-badge.teacher {
    background-color: var(--warning-color);
    color: var(--dark-color);
}

.profile-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

@media (max-width: 768px) {
    .profile-grid {
        grid-template-columns: 1fr;
    }
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.skill-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background-color: var(--light-color);
    border-radius: 0.25rem;
    font-size: 0.875rem;
}

.projects-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.project-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 1rem;
    background-color: var(--light-color);
    border-radius: 0.5rem;
}

.project-info {
    flex: 1;
}

.project-info h4 {
    margin-bottom: 0.25rem;
    font-size: 1.1rem;
}

.project-status {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.project-status.in_progress {
    background-color: var(--warning-color);
    color: var(--dark-color);
}

.project-status.completed {
    background-color: var(--success-color);
    color: white;
}

.project-status.reviewed {
    background-color: var(--info-color);
    color: white;
}

.project-date {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.stats-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.stats-item:last-child {
    border-bottom: none;
}

.stats-label {
    font-weight: 500;
}

.stats-value {
    font-weight: 600;
}

.chart-container {
    margin-top: 1.5rem;
    height: 200px;
}

.hidden {
    display: none;
}

.active {
    display: block;
}

.text-muted {
    color: var(--text-muted);
}

/* Проекты */
.projects-section {
    padding: 2rem 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.section-header h2 {
    margin: 0;
}

.empty-state {
    text-align: center;
    padding: 3rem;
    background-color: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.empty-state p {
    margin-bottom: 1.5rem;
    color: var(--text-muted);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background-color: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

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

.project-card-header h3 {
    margin: 0;
    font-size: 1.1rem;
}

.project-card-body {
    padding: 1rem;
    min-height: 100px;
}

.project-card-footer {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.project-actions {
    display: flex;
    gap: 0.5rem;
}

.project-form {
    max-width: 800px;
    margin: 0 auto;
}

.file-info {
    margin-top: 0.5rem;
    font-size: 0.875rem;
}

/* Страница проекта */
.project-section {
    padding: 2rem 0;
}

.header-actions {
    display: flex;
    gap: 1rem;
}

.project-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

@media (max-width: 768px) {
    .project-grid {
        grid-template-columns: 1fr;
    }
}

.project-meta {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.project-description h4,
.project-file h4 {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.project-file {
    margin-top: 1.5rem;
}

.feedback-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.feedback-item {
    padding: 1rem;
    background-color: var(--light-color);
    border-radius: 0.5rem;
}

.feedback-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.feedback-author {
    font-weight: 500;
}

.feedback-date {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.add-feedback {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.add-feedback h4 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.grade-summary {
    text-align: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.average-grade {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.grade-value {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.grade-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.grade-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.grade-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem;
    background-color: var(--light-color);
    border-radius: 0.25rem;
}

.add-grade {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.add-grade h4 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Админ-панель */
.admin-section {
    padding: 2rem 0;
}

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

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

.stat-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-muted);
}

.admin-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

@media (max-width: 992px) {
    .admin-grid {
        grid-template-columns: 1fr;
    }
}

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

.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: rgba(0, 0, 0, 0.02);
    font-weight: 600;
}

.status-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.status-badge.in_progress {
    background-color: var(--warning-color);
    color: var(--dark-color);
}

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

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

.top-students {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.student-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background-color: var(--light-color);
    border-radius: 0.25rem;
}

.student-name {
    font-weight: 500;
    display: block;
}

.student-projects {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.student-grade {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* Адаптивность */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    nav ul li {
        margin: 0 0.75rem;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .profile-info {
        flex-direction: column;
        text-align: center;
    }
    
    .section-header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .project-item {
        flex-direction: column;
        gap: 1rem;
    }
    
    .project-actions {
        width: 100%;
        justify-content: center;
    }
    
    .header-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .header-actions .btn {
        width: 100%;
        text-align: center;
    }
}