/* styles.css */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #4b5563;
    --background-color: #f3f4f6;
    --card-background: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --danger-color: #ef4444;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --transition-default: all 0.3s ease;
}

[data-theme="dark"] {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #9ca3af;
    --background-color: #1f2937;
    --card-background: #374151;
    --text-primary: #f3f4f6;
    --text-secondary: #d1d5db;
    --border-color: #4b5563;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-primary);
    transition: var(--transition-default);
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Navigation Bar */
.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: var(--card-background);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-sm);
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.search-filter-container {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.search-box input {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    background-color: var(--background-color);
    color: var(--text-primary);
    width: 250px;
}

.filter-controls {
    display: flex;
    gap: 0.5rem;
}

.filter-controls select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    background-color: var(--background-color);
    color: var(--text-primary);
}

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

/* Statistics */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background-color: var(--card-background);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition-default);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 600;
    color: var(--primary-color);
}

.stat-label {
    color: var(--text-secondary);
    margin-top: 0.5rem;
    font-size: 0.875rem;
}

.stat-trend {
    color: var(--text-secondary);
    font-size: 0.75rem;
    margin-top: 0.5rem;
}

/* Analytics Dashboard */
.analytics-dashboard {
    background-color: var(--card-background);
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
}

.analytics-dashboard.hidden {
    display: none;
}

.analytics-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

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

.analytics-card {
    background-color: var(--background-color);
    padding: 1rem;
    border-radius: 0.375rem;
    min-height: 300px;
}

.analytics-card h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* Boards */
.board-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.board {
    background-color: var(--card-background);
    border-radius: 0.5rem;
    padding: 1.5rem;
    min-height: 500px;
    box-shadow: var(--shadow-sm);
}

.board-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
}

.task-count {
    background-color: var(--secondary-color);
    color: var(--card-background);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.875rem;
}

/* Tasks */
.task-list {
    min-height: 200px;
}

.task {
    background-color: var(--background-color);
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 0.75rem;
    cursor: move;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-default);
    border: 1px solid var(--border-color);
}

.task:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.task-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 0.75rem;
}

.task h3 {
    font-size: 1rem;
    color: var(--text-primary);
    margin-right: 1rem;
}

.priority-badge {
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: capitalize;
}

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

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

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

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

.tag {
    background-color: var(--primary-color);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
}

.task-date {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

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

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition-default);
    font-size: 0.875rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

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

.btn-secondary:hover {
    opacity: 0.9;
}

.btn-icon {
    font-size: 1.125rem;
}

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

.modal-content {
    background-color: var(--card-background);
    padding: 2rem;
    border-radius: 0.5rem;
    width: 90%;
    max-width: 500px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition-default);
}

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

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.625rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    background-color: var(--background-color);
    color: var(--text-primary);
    transition: var(--transition-default);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

.checklist-container {
    margin-bottom: 1rem;
}

.checklist-item {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.btn-remove-item {
    background: none;
    border: none;
    color: var(--danger-color);
    cursor: pointer;
    font-size: 1.25rem;
}

/* Context Menu */
.context-menu {
    display: none;
    position: fixed;
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    padding: 0.5rem 0;
    box-shadow: var(--shadow-md);
    z-index: 1000;
}

.context-menu ul {
    list-style: none;
}

.context-menu li {
    padding: 0.5rem 1rem;
    cursor: pointer;
    color: var(--text-primary);
    transition: var(--transition-default);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.context-menu li:hover {
    background-color: var(--background-color);
}

.menu-icon {
    font-size: 1rem;
}

/* Notification */
.notification {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    padding: 1rem 1.5rem;
    border-radius: 0.375rem;
    background-color: var(--card-background);
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    display: none;
    animation: slideIn 0.3s ease-out;
}

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

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

.notification.warning {
    background-color: var(--warning-color);
    color: white;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .top-nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-left {
        flex-direction: column;
        gap: 1rem;
    }
    
    .search-filter-container {
        flex-direction: column;
        width: 100%;
    }
    
    .search-box input,
    .filter-controls select {
        width: 100%;
    }
    
    .board-container {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        padding: 1.5rem;
    }
    
    .analytics-grid {
        grid-template-columns: 1fr;
    }
}