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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.task-input {
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

#taskForm {
    display: flex;
    gap: 10px;
}

#taskInput {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

#taskInput:focus {
    outline: none;
    border-color: #667eea;
}

#taskForm button {
    padding: 12px 24px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#taskForm button:hover {
    background: #5a67d8;
}

.filters {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    justify-content: center;
}

.filter-btn {
    padding: 8px 16px;
    background: white;
    border: 2px solid #e1e5e9;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
}

.filter-btn.active,
.filter-btn:hover {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

.task-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    color: white;
    font-size: 14px;
}

.clear-btn {
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-size: 12px;
}

.clear-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.task-list {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

#taskList {
    list-style: none;
}

.task-item {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid #e1e5e9;
    transition: background-color 0.3s ease;
}

.task-item:hover {
    background-color: #f8f9fa;
}

.task-item.completed {
    opacity: 0.6;
}

.task-item.completed .task-text {
    text-decoration: line-through;
    color: #6c757d;
}

.task-checkbox {
    width: 20px;
    height: 20px;
    margin-right: 15px;
    cursor: pointer;
}

.task-text {
    flex: 1;
    font-size: 16px;
    color: #333;
}

.task-delete {
    padding: 6px 12px;
    background: #dc3545;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    transition: background-color 0.3s ease;
}

.task-delete:hover {
    background: #c82333;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: #6c757d;
}

.empty-state h3 {
    margin-bottom: 10px;
    font-size: 1.2rem;
}

footer {
    text-align: center;
    margin-top: 40px;
    color: white;
    opacity: 0.8;
}

@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    #taskForm {
        flex-direction: column;
    }
    
    .filters {
        flex-wrap: wrap;
    }
    
    .task-stats {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
}