:root {
    --primary-color: #4a90e2;
    --secondary-color: #f5f5f5;
    --text-color: #333;
    --danger-color: #e74c3c;
    --success-color: #2ecc71;
    --warning-color: #f1c40f;
    --priority-high: #ff4757;
    --priority-medium: #ffa502;
    --priority-low: #7bed9f;
}

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

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    background-color: #f0f2f5;
    color: var(--text-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
}

.task-form {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

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

input[type="text"],
textarea,
input[type="datetime-local"],
select {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

textarea {
    height: 100px;
    resize: vertical;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

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

.tasks-container {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.tasks-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.task-filters {
    display: flex;
    gap: 0.5rem;
}

.filter-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--primary-color);
    background: none;
    color: var(--primary-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
}

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

.task-card {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 1rem;
    margin-bottom: 1rem;
    background: var(--secondary-color);
    transition: transform 0.2s;
}

.task-card:hover {
    transform: translateY(-2px);
}

.task-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.task-title {
    font-size: 1.2rem;
    font-weight: 500;
    margin-right: 1rem;
}

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

.task-status {
    padding: 0.5rem;
    border-radius: 4px;
    border: 1px solid #ddd;
}

.btn-delete {
    background-color: var(--danger-color);
    color: white;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.task-description {
    margin: 0.5rem 0;
    color: #666;
}

.task-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: #888;
    margin-top: 0.5rem;
}

.priority-badge {
    padding: 0.2rem 0.5rem;
    border-radius: 3px;
    font-size: 0.8rem;
    font-weight: 500;
    color: white;
}

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

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

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

[data-status="completed"] {
    border-left: 4px solid var(--success-color);
}

[data-status="in-progress"] {
    border-left: 4px solid var(--warning-color);
}

[data-status="pending"] {
    border-left: 4px solid var(--danger-color);
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .tasks-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .task-filters {
        flex-wrap: wrap;
    }
    
    .task-header {
        flex-direction: column;
        gap: 1rem;
    }
    
    .task-actions {
        width: 100%;
        justify-content: space-between;
    }
}