* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 800px;
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #5d67b2, #4a5699);
    color: white;
    padding: 1.5rem 2rem;
    text-align: center;
}

h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.subtitle {
    opacity: 0.9;
    font-size: 0.9rem;
}

.controls {
    padding: 1.5rem;
    background: #f8f9fa;
    border-bottom: 1px solid #e9ecef;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

input, select, button {
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
}

input:focus, select:focus {
    outline: none;
    border-color: #5d67b2;
    box-shadow: 0 0 0 2px rgba(93, 103, 178, 0.2);
}

input {
    flex: 1;
}

select {
    width: 120px;
}

button {
    background: #5d67b2;
    color: white;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
}

button:hover {
    background: #4a5699;
    transform: translateY(-2px);
}

.filter-section {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.filter-btn {
    background: transparent;
    color: #5d67b2;
    border: 1px solid #5d67b2;
    padding: 0.5rem 1rem;
}

.filter-btn.active {
    background: #5d67b2;
    color: white;
}

.tasks-container {
    padding: 1.5rem;
}

.tasks-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #e9ecef;
}

.task-count {
    font-size: 0.9rem;
    color: #666;
}

.sort-select {
    width: auto;
    padding: 0.5rem;
}

.task-list {
    list-style: none;
}

.task-item {
    background: white;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 10px;
    display: flex;
    align-items: flex-start;
    gap: 15px;
    transition: all 0.3s ease;
}

.task-item:hover {
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transform: translateY(-1px);
}

.task-checkbox {
    margin-top: 3px;
}

.task-content {
    flex: 1;
}

.task-title {
    font-weight: 600;
    margin-bottom: 5px;
    word-break: break-word;
}

.task-due {
    font-size: 0.85rem;
    color: #666;
    margin-bottom: 5px;
}

.task-category {
    display: inline-block;
    background: #e9ecef;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    color: #5d67b2;
}

.task-completed .task-title {
    text-decoration: line-through;
    color: #999;
}

.task-completed .task-category {
    background: #d4edda;
    color: #155724;
}

.task-actions {
    display: flex;
    gap: 10px;
}

.action-btn {
    background: transparent;
    color: #666;
    border: none;
    padding: 0.5rem;
    font-size: 1.1rem;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.action-btn:hover {
    background: #f8f9fa;
    color: #5d67b2;
}

.edit-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid #e9ecef;
}

.datetime-inputs {
    display: flex;
    gap: 10px;
}

.datetime-inputs input {
    flex: 1;
}

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: #999;
}

.empty-state p {
    margin-bottom: 1rem;
}

@media (max-width: 600px) {
    .input-group {
        flex-direction: column;
    }
    
    select, .datetime-inputs {
        width: 100%;
    }
    
    .filter-section {
        flex-direction: column;
    }
    
    .task-item {
        flex-direction: column;
        gap: 10px;
    }
    
    .task-actions {
        align-self: flex-end;
    }
}