/* CSS переменные для светлой темы */
:root {
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --primary-color: #4a90e2;
    --primary-hover: #357abd;
    --success-color: #52c41a;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --border-color: #e1e8ed;
    --shadow: rgba(0, 0, 0, 0.1);
    --completed-bg: #f0f9ff;
    --delete-color: #ff4d4f;
    --delete-hover: #ff7875;
    --modal-overlay: rgba(0, 0, 0, 0.5);
    --highlight-bg: #fff3cd;
    --priority-high: #ef4444;
    --priority-medium: #f59e0b;
    --priority-low: #10b981;
    --deadline-warning: #f59e0b;
    --deadline-danger: #ef4444;
    --progress-bg: #e9ecef;
    --kanban-bg: #f8f9fa;
    --toast-bg: #333333;
}

/* CSS переменные для тёмной темы */
[data-theme="dark"] {
    --bg-color: #1a1a2e;
    --card-bg: #16213e;
    --primary-color: #4a90e2;
    --primary-hover: #5a9fe8;
    --success-color: #4ade80;
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --border-color: #3f3f46;
    --shadow: rgba(0, 0, 0, 0.3);
    --completed-bg: #1e3a5f;
    --delete-color: #f87171;
    --delete-hover: #fca5a5;
    --modal-overlay: rgba(0, 0, 0, 0.7);
    --highlight-bg: #78350f;
    --progress-bg: #374151;
    --kanban-bg: #1e293b;
    --toast-bg: #e4e4e7;
}

/* Сброс стилей и базовые настройки */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    padding: 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

/* Заголовок */
.header {
    text-align: center;
    padding: 30px 20px;
    margin-bottom: 30px;
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.header-title {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}

.header-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

/* Переключатель темы */
.theme-toggle {
    position: relative;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.theme-toggle:hover {
    transform: rotate(15deg);
    box-shadow: 0 4px 12px var(--shadow);
}

/* Progress Bar (#24) */
.progress-section {
    width: 100%;
    margin-bottom: 20px;
}

.progress-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 2px 8px var(--shadow);
    padding: 20px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.progress-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.progress-text {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 600;
}

.progress-bar-container {
    width: 100%;
    height: 12px;
    background-color: var(--progress-bg);
    border-radius: 6px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
    border-radius: 6px;
    transition: width 0.5s ease;
    width: 0%;
}

/* View Toggle */
.view-toggle-section {
    width: 100%;
    margin-bottom: 20px;
}

.view-toggle-card {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.view-toggle-btn {
    padding: 10px 20px;
    border: 2px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.view-toggle-btn:hover {
    border-color: var(--primary-color);
    background-color: var(--bg-color);
}

.view-toggle-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Основной контент */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Секция добавления задачи */
.add-task-section {
    width: 100%;
}

.add-task-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 2px 8px var(--shadow);
    padding: 20px;
}

.add-task-form {
    display: flex;
    gap: 12px;
    align-items: stretch;
}

.task-input {
    flex: 1;
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    color: var(--text-primary);
    background-color: var(--bg-color);
    transition: all 0.2s ease;
}

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

.task-input::placeholder {
    color: var(--text-secondary);
}

/* Кнопки */
.btn {
    padding: 14px 24px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--text-secondary);
    color: white;
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
}

.btn-icon {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.btn-icon:hover {
    background-color: var(--bg-color);
}

/* Секция фильтров */
.filters-section {
    width: 100%;
}

.filters-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 2px 8px var(--shadow);
    padding: 20px;
}

.search-container {
    margin-bottom: 16px;
}

.search-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    color: var(--text-primary);
    background-color: var(--bg-color);
    transition: all 0.2s ease;
}

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

.filters-row {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.filter-label {
    font-size: 14px;
    color: var(--text-secondary);
    white-space: nowrap;
}

.filter-select {
    padding: 8px 12px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    color: var(--text-primary);
    background-color: var(--bg-color);
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.tasks-count {
    margin-top: 12px;
    font-size: 14px;
    color: var(--text-secondary);
    text-align: right;
}

/* Секция категорий */
.categories-section {
    width: 100%;
}

.categories-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 2px 8px var(--shadow);
    padding: 20px;
}

.categories-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.categories-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.categories-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.category-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

.category-tag:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 8px var(--shadow);
}

.category-tag.active {
    border-color: var(--text-primary);
}

.category-tag .category-delete {
    opacity: 0;
    cursor: pointer;
    font-size: 14px;
    transition: opacity 0.2s ease;
}

.category-tag:hover .category-delete {
    opacity: 1;
}

/* Список задач */
.tasks-section {
    width: 100%;
}

.tasks-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Карточка задачи */
.task-card {
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    padding: 16px 20px;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    transition: all 0.2s ease;
    border-left: 4px solid transparent;
}

.task-card[data-priority="high"] {
    border-left-color: var(--priority-high);
}

.task-card[data-priority="medium"] {
    border-left-color: var(--priority-medium);
}

.task-card[data-priority="low"] {
    border-left-color: var(--priority-low);
}

.task-card:hover {
    box-shadow: 0 4px 12px var(--shadow);
    transform: translateY(-2px);
}

.task-card.task-completed {
    background-color: var(--completed-bg);
    opacity: 0.8;
}

.task-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 0;
}

.task-main-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.task-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
    flex-shrink: 0;
    accent-color: var(--success-color);
}

.task-text {
    font-size: 15px;
    color: var(--text-primary);
    cursor: pointer;
    flex: 1;
    word-break: break-word;
    line-height: 1.5;
}

.task-completed .task-text {
    text-decoration: line-through;
    color: var(--text-secondary);
}

.task-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.task-category {
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.task-priority {
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    color: white;
}

.task-priority.high {
    background-color: var(--priority-high);
}

.task-priority.medium {
    background-color: var(--priority-medium);
}

.task-priority.low {
    background-color: var(--priority-low);
}

.task-deadline {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--text-secondary);
}

.task-deadline.overdue {
    color: var(--deadline-danger);
    font-weight: 600;
}

.task-deadline.warning {
    color: var(--deadline-warning);
    font-weight: 600;
}

.task-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.btn-edit {
    color: var(--text-secondary);
}

.btn-edit:hover {
    background-color: var(--bg-color);
    color: var(--primary-color);
}

.btn-delete {
    color: var(--delete-color);
}

.btn-delete:hover {
    background-color: rgba(255, 77, 79, 0.1);
    color: var(--delete-hover);
}

/* Subtask button */
.btn-subtask {
    color: var(--primary-color);
}

.btn-subtask:hover {
    background-color: rgba(74, 144, 226, 0.1);
    color: var(--primary-hover);
}

/* Подсветка поиска */
.highlight {
    background-color: var(--highlight-bg);
    padding: 1px 2px;
    border-radius: 2px;
}

/* Модальное окно */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--modal-overlay);
}

.modal-content {
    position: relative;
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 24px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 8px 32px var(--shadow);
    animation: modalSlideIn 0.3s ease;
    max-height: 80vh;
    overflow-y: auto;
}

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

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

.modal-header h3 {
    font-size: 18px;
    color: var(--text-primary);
}

.modal-close {
    font-size: 24px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.2s ease;
}

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

.modal-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.form-input {
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    color: var(--text-primary);
    background-color: var(--bg-color);
    transition: all 0.2s ease;
}

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

.color-picker {
    display: flex;
    align-items: center;
    gap: 12px;
}

.color-input {
    width: 50px;
    height: 40px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    padding: 2px;
}

.color-presets {
    display: flex;
    gap: 6px;
}

.color-preset {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: transform 0.2s ease;
}

.color-preset:hover {
    transform: scale(1.1);
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 8px;
}

/* Achievements Modal (#26) */
.achievements-content {
    max-width: 500px;
}

.achievements-list {
    display: grid;
    gap: 12px;
}

.achievement-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: 8px;
    background-color: var(--bg-color);
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.achievement-item.unlocked {
    border-color: var(--success-color);
    background: linear-gradient(135deg, rgba(82, 196, 26, 0.1), rgba(74, 144, 226, 0.1));
}

.achievement-item.locked {
    opacity: 0.5;
}

.achievement-icon {
    font-size: 32px;
}

.achievement-info {
    flex: 1;
}

.achievement-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.achievement-desc {
    font-size: 12px;
    color: var(--text-secondary);
}

.achievement-progress {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Hotkeys Modal (#25) */
.hotkeys-content {
    max-width: 400px;
}

.hotkeys-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.hotkey-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px;
    border-radius: 6px;
    background-color: var(--bg-color);
}

.hotkey-item kbd {
    padding: 6px 12px;
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-family: monospace;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    box-shadow: 0 2px 0 var(--border-color);
}

.hotkey-item span {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Subtask Modal (#27) */
.subtask-progress {
    margin-bottom: 16px;
}

.subtask-progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--progress-bg);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 8px;
}

.subtask-progress-fill {
    height: 100%;
    background-color: var(--success-color);
    transition: width 0.3s ease;
}

.add-subtask-form {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.add-subtask-form .form-input {
    flex: 1;
}

.subtasks-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.subtask-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    border-radius: 6px;
    background-color: var(--bg-color);
}

.subtask-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--success-color);
}

.subtask-text {
    flex: 1;
    font-size: 14px;
    color: var(--text-primary);
}

.subtask-item.completed .subtask-text {
    text-decoration: line-through;
    color: var(--text-secondary);
}

.subtask-delete {
    background: none;
    border: none;
    color: var(--delete-color);
    cursor: pointer;
    font-size: 16px;
    padding: 4px;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.subtask-delete:hover {
    opacity: 1;
}

/* Kanban Board (#28) */
.kanban-section {
    width: 100%;
}

.kanban-board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    overflow-x: auto;
}

.kanban-column {
    background-color: var(--kanban-bg);
    border-radius: 12px;
    padding: 16px;
    min-height: 400px;
}

.kanban-column-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border-color);
}

.kanban-column-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.kanban-count {
    background-color: var(--primary-color);
    color: white;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.kanban-column-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.kanban-task-card {
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    padding: 12px;
    cursor: grab;
    transition: all 0.2s ease;
    border-left: 4px solid transparent;
}

.kanban-task-card:hover {
    box-shadow: 0 4px 12px var(--shadow);
    transform: translateY(-2px);
}

.kanban-task-card.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.kanban-task-card[data-priority="high"] {
    border-left-color: var(--priority-high);
}

.kanban-task-card[data-priority="medium"] {
    border-left-color: var(--priority-medium);
}

.kanban-task-card[data-priority="low"] {
    border-left-color: var(--priority-low);
}

.kanban-task-title {
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: 8px;
    word-break: break-word;
}

.kanban-task-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
}

.kanban-task-subtasks {
    font-size: 11px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--toast-bg);
    color: var(--bg-color);
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    box-shadow: 0 4px 12px var(--shadow);
    z-index: 2000;
    opacity: 0;
    transition: all 0.3s ease;
    max-width: 90%;
    text-align: center;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Адаптивность для мобильных устройств */
@media (max-width: 767px) {
    body {
        padding: 16px;
    }

    .header {
        padding: 20px 16px;
        margin-bottom: 24px;
    }

    .header-title {
        font-size: 24px;
    }

    .header-actions {
        order: -1;
        width: 100%;
        justify-content: center;
        margin-bottom: 8px;
    }

    .add-task-card {
        padding: 16px;
    }

    .add-task-form {
        flex-direction: column;
        gap: 12px;
    }

    .task-input {
        width: 100%;
    }

    .btn-primary {
        width: 100%;
    }

    .filters-row {
        flex-direction: column;
        gap: 12px;
    }

    .filter-group {
        width: 100%;
    }

    .filter-select {
        flex: 1;
    }

    .categories-header {
        flex-direction: column;
        gap: 12px;
        align-items: stretch;
    }

    .kanban-board {
        grid-template-columns: 1fr;
    }

    .kanban-column {
        min-height: 200px;
    }

    .task-card {
        padding: 14px 16px;
        gap: 12px;
    }

    .task-content {
        gap: 8px;
    }

    .task-text {
        font-size: 14px;
    }

    .task-actions {
        gap: 6px;
    }

    .btn-icon {
        width: 36px;
        height: 36px;
        font-size: 18px;
    }
}

/* Состояние пустого списка */
.tasks-list:empty::after {
    content: "Пока нет задач. Добавьте первую задачу!";
    display: block;
    text-align: center;
    color: var(--text-secondary);
    padding: 40px 20px;
    font-size: 15px;
}

/* Улучшение доступности */
.btn:focus,
.task-checkbox:focus,
.task-input:focus,
.btn-icon:focus,
.filter-select:focus,
.form-input:focus,
.view-toggle-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Анимация появления задачи */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.task-card {
    animation: slideIn 0.3s ease;
}

/* Achievement unlock animation */
@keyframes achievementPop {
    0% {
        transform: scale(0.8);
        opacity: 0;
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.achievement-item.unlocked {
    animation: achievementPop 0.5s ease;
}