/* Переменные цветов и стилей */
:root {
    --primary: #4361ee;
    --primary-dark: #3a56d4;
    --secondary: #7209b7;
    --success: #4cc9f0;
    --danger: #f72585;
    --warning: #f8961e;
    --info: #4895ef;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --gray-light: #e9ecef;
    --border-radius: 12px;
    --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

/* Темная тема */
[data-theme="dark"] {
    --light: #121212;
    --dark: #f8f9fa;
    --gray-light: #2d2d2d;
    --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--light);
    color: var(--dark);
    line-height: 1.6;
    transition: var(--transition);
    overflow-x: hidden;
}

/* Боковая панель */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 260px;
    height: 100vh;
    background: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
}

.sidebar-header {
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 600;
}

.logo i {
    font-size: 1.5rem;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    display: none;
}

.sidebar-menu {
    list-style: none;
    padding: 20px 0;
    flex-grow: 1;
}

.menu-item {
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: var(--transition);
    border-left: 4px solid transparent;
}

.menu-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.menu-item.active {
    background-color: rgba(255, 255, 255, 0.15);
    border-left-color: white;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-btn {
    width: 100%;
    padding: 12px;
    margin-bottom: 10px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: var(--border-radius);
    color: white;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: var(--transition);
}

.sidebar-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Основной контент */
.main-content {
    margin-left: 260px;
    padding: 30px;
    min-height: 100vh;
    transition: var(--transition);
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 20px;
}

.header-title h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 5px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-title p {
    color: var(--gray);
    font-size: 1rem;
}

.header-actions {
    display: flex;
    gap: 15px;
}

/* Кнопки */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(67, 97, 238, 0.3);
}

.btn-secondary {
    background-color: var(--gray-light);
    color: var(--dark);
}

.btn-secondary:hover {
    background-color: #d1d5db;
    transform: translateY(-2px);
}

/* Секции контента */
.content-section {
    display: none;
    animation: fadeIn 0.5s ease;
}

.content-section.active {
    display: block;
}

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

/* Контейнер задач */
.tasks-container {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

[data-theme="dark"] .tasks-container {
    background-color: #1e1e1e;
    color: #f0f0f0;
}

.tasks-header {
    padding: 24px;
    border-bottom: 1px solid var(--gray-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.tasks-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.tasks-controls {
    display: flex;
    gap: 15px;
}

.module-selector {
    display: flex;
    background-color: var(--gray-light);
    border-radius: var(--border-radius);
    padding: 4px;
}

[data-theme="dark"] .module-selector {
    background-color: #2d2d2d;
}

.module-btn {
    padding: 8px 16px;
    border: none;
    background: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.module-btn.active {
    background-color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .module-btn.active {
    background-color: #3d3d3d;
    color: #f0f0f0;
}

/* Список задач */
.tasks-list {
    display: none;
    padding: 24px;
}

.tasks-list.active {
    display: block;
}

.task-item {
    background-color: var(--gray-light);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 20px;
    transition: var(--transition);
}

[data-theme="dark"] .task-item {
    background-color: #2d2d2d;
    color: #f0f0f0;
}

.task-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.task-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.task-number {
    font-weight: 600;
    color: var(--primary);
    font-size: 1.1rem;
}

.task-theory-btn {
    background: none;
    border: none;
    color: var(--info);
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 5px;
}

.task-text {
    font-size: 1.1rem;
    margin-bottom: 15px;
    line-height: 1.6;
}

.answer-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
    background-color: white;
    color: var(--dark);
}

[data-theme="dark"] .answer-input {
    background-color: #3d3d3d;
    border-color: #555;
    color: #f0f0f0;
}

.answer-input:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.answer-input.error {
    border-color: var(--danger);
    background-color: rgba(247, 37, 133, 0.05);
}

/* Загрузка */
.loading {
    display: none;
    text-align: center;
    padding: 40px;
    color: var(--primary);
}

.spinner {
    border: 4px solid rgba(67, 97, 238, 0.2);
    border-left-color: var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Теория */
.theory-container {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 30px;
}

[data-theme="dark"] .theory-container {
    background-color: #1e1e1e;
    color: #f0f0f0;
}

.theory-container h2 {
    margin-bottom: 24px;
    font-size: 1.8rem;
    font-weight: 600;
}

.theory-modules {
    display: grid;
    gap: 30px;
}

.theory-module h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    font-size: 1.4rem;
    color: var(--primary);
}

.theory-content {
    display: grid;
    gap: 20px;
}

.theory-item {
    background-color: var(--gray-light);
    border-radius: var(--border-radius);
    padding: 20px;
    transition: var(--transition);
}

[data-theme="dark"] .theory-item {
    background-color: #2d2d2d;
    color: #f0f0f0;
}

.theory-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.theory-item h4 {
    margin-bottom: 10px;
    font-size: 1.2rem;
    color: var(--dark);
}

[data-theme="dark"] .theory-item h4 {
    color: #f0f0f0;
}

.theory-item p {
    margin-bottom: 8px;
}

.theory-example {
    background-color: white;
    border-radius: 8px;
    padding: 15px;
    margin-top: 10px;
    border-left: 4px solid var(--primary);
}

[data-theme="dark"] .theory-example {
    background-color: #3d3d3d;
    color: #f0f0f0;
}

/* Заметки */
.notes-container {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 30px;
}

[data-theme="dark"] .notes-container {
    background-color: #1e1e1e;
    color: #f0f0f0;
}

.notes-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.note {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: var(--border-radius);
    padding: 20px;
    position: relative;
    transition: var(--transition);
    border: 1px solid #e2e8f0;
}

[data-theme="dark"] .note {
    background: linear-gradient(135deg, #2d2d2d, #3d3d3d);
    border-color: #555;
    color: #f0f0f0;
}

.note:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.note-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #e2e8f0;
}

[data-theme="dark"] .note-header {
    border-bottom-color: #555;
}

.note-title {
    font-weight: 600;
    color: var(--dark);
    font-size: 1.2rem;
    border: none;
    background: none;
    width: 100%;
    margin-right: 10px;
    font-family: 'Inter', sans-serif;
}

[data-theme="dark"] .note-title {
    color: #f0f0f0;
}

.note-title:focus {
    outline: none;
    background-color: rgba(255, 250, 205, 0.5);
    border-radius: 4px;
    padding: 4px;
}

[data-theme="dark"] .note-title:focus {
    background-color: rgba(255, 255, 255, 0.1);
}

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

.note-action {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    padding: 5px;
    border-radius: 4px;
    transition: var(--transition);
    color: var(--gray);
}

.note-action:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--dark);
}

[data-theme="dark"] .note-action:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: #f0f0f0;
}

.note-content {
    border: none;
    background: none;
    width: 100%;
    min-height: 120px;
    resize: vertical;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--dark);
}

[data-theme="dark"] .note-content {
    color: #f0f0f0;
}

.note-content:focus {
    outline: none;
    background-color: rgba(255, 250, 205, 0.5);
    border-radius: 4px;
    padding: 8px;
}

[data-theme="dark"] .note-content:focus {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Прогресс */
.progress-container {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 30px;
}

[data-theme="dark"] .progress-container {
    background-color: #1e1e1e;
    color: #f0f0f0;
}

.progress-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--border-radius);
    padding: 24px;
    color: white;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(67, 97, 238, 0.3);
}

.stat-icon {
    font-size: 2rem;
    opacity: 0.8;
}

.stat-info h3 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 5px;
    opacity: 0.9;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
}

.progress-chart {
    background-color: var(--gray-light);
    border-radius: var(--border-radius);
    padding: 24px;
}

[data-theme="dark"] .progress-chart {
    background-color: #2d2d2d;
}

.progress-chart h3 {
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.chart-container {
    display: grid;
    gap: 15px;
}

.chart-bar {
    display: flex;
    align-items: center;
    gap: 15px;
}

.chart-label {
    width: 120px;
    font-weight: 500;
}

.chart-progress {
    flex-grow: 1;
    height: 20px;
    background-color: white;
    border-radius: 10px;
    overflow: hidden;
}

[data-theme="dark"] .chart-progress {
    background-color: #3d3d3d;
}

.chart-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 10px;
    transition: width 1s ease;
}

.chart-value {
    width: 50px;
    text-align: right;
    font-weight: 600;
}

/* Модальные окна */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 20px;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background-color: white;
    border-radius: var(--border-radius);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    animation: slideUp 0.3s ease;
}

[data-theme="dark"] .modal-content {
    background-color: #1e1e1e;
    color: #f0f0f0;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--gray-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

[data-theme="dark"] .modal-header {
    border-bottom-color: #555;
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--gray);
    transition: var(--transition);
    padding: 5px;
    border-radius: 4px;
}

.close-btn:hover {
    background-color: var(--gray-light);
    color: var(--dark);
}

[data-theme="dark"] .close-btn:hover {
    background-color: #3d3d3d;
    color: #f0f0f0;
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 20px 24px;
    border-top: 1px solid var(--gray-light);
    display: flex;
    justify-content: flex-end;
}

[data-theme="dark"] .modal-footer {
    border-top-color: #555;
}

/* Результаты */
.result-text {
    font-size: 1.2rem;
    margin-bottom: 20px;
    text-align: center;
    line-height: 1.6;
}

.math-fact {
    background: linear-gradient(135deg, #ffeaa7, #fab1a0);
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    border-left: 4px solid #e17055;
}

[data-theme="dark"] .math-fact {
    background: linear-gradient(135deg, #3d3d3d, #4d4d4d);
    color: #f0f0f0;
}

.fact-title {
    font-weight: bold;
    color: #2d3436;
    margin-bottom: 10px;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

[data-theme="dark"] .fact-title {
    color: #f0f0f0;
}

.fact-content {
    color: #2d3436;
    line-height: 1.5;
    font-style: italic;
}

[data-theme="dark"] .fact-content {
    color: #f0f0f0;
}

.incorrect-answers {
    margin-top: 20px;
    padding: 15px;
    background-color: rgba(247, 37, 133, 0.05);
    border-radius: 8px;
    border-left: 4px solid var(--danger);
}

[data-theme="dark"] .incorrect-answers {
    background-color: rgba(247, 37, 133, 0.1);
}

.incorrect-title {
    font-weight: bold;
    color: var(--danger);
    margin-bottom: 10px;
}

.incorrect-list {
    list-style-type: none;
}

.incorrect-item {
    margin-bottom: 8px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(247, 37, 133, 0.2);
}

.task-example {
    font-style: italic;
    color: var(--gray);
    margin-top: 5px;
    font-size: 0.9rem;
}

/* Настройки */
.setting-group {
    margin-bottom: 20px;
}

.setting-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.setting-input, .setting-select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
    background-color: white;
    color: var(--dark);
}

[data-theme="dark"] .setting-input,
[data-theme="dark"] .setting-select {
    background-color: #2d2d2d;
    border-color: #555;
    color: #f0f0f0;
}

.setting-input:focus, .setting-select:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.setting-description {
    font-size: 0.9rem;
    color: var(--gray);
    margin-top: 5px;
}

.setting-checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
}

.setting-checkbox input {
    width: 18px;
    height: 18px;
}

.api-status {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
    font-size: 0.9rem;
}

.api-status.connected {
    color: var(--success);
}

.api-status.disconnected {
    color: var(--danger);
}

/* Уведомления */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 16px 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: 350px;
    animation: slideInRight 0.3s ease;
    border-left: 4px solid var(--primary);
}

[data-theme="dark"] .toast {
    background-color: #2d2d2d;
    color: #f0f0f0;
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(100%); }
    to { opacity: 1; transform: translateX(0); }
}

.toast.success {
    border-left-color: var(--success);
}

.toast.error {
    border-left-color: var(--danger);
}

.toast.warning {
    border-left-color: var(--warning);
}

.toast.info {
    border-left-color: var(--info);
}

.toast-icon {
    font-size: 1.2rem;
}

.toast-message {
    flex-grow: 1;
}

.toast-close {
    background: none;
    border: none;
    font-size: 1rem;
    cursor: pointer;
    color: var(--gray);
}

/* Адаптивность */
@media (max-width: 992px) {
    .sidebar {
        width: 70px;
        overflow: hidden;
    }
    
    .sidebar-header {
        justify-content: center;
    }
    
    .logo span, .menu-item span, .sidebar-btn span {
        display: none;
    }
    
    .main-content {
        margin-left: 70px;
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .sidebar.expanded {
        width: 260px;
    }
    
    .sidebar.expanded .logo span, 
    .sidebar.expanded .menu-item span, 
    .sidebar.expanded .sidebar-btn span {
        display: inline;
    }
}

@media (max-width: 768px) {
    .main-content {
        padding: 20px;
        margin-left: 0;
    }
    
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .content-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .header-actions {
        width: 100%;
        justify-content: space-between;
    }
    
    .tasks-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .notes-grid {
        grid-template-columns: 1fr;
    }
    
    .progress-stats {
        grid-template-columns: 1fr;
    }
    
    .chart-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .chart-label {
        width: 100%;
    }
    
    .chart-value {
        width: 100%;
        text-align: left;
    }
}