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

body {
    background-color: #f5f5f5;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    background-color: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 500px;
    transition: background-color 0.3s;
}

h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #333;
}

#todo-input {
    display: flex;
    margin-bottom: 15px;
    gap: 10px;
}

#_input {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

#taskBtn {
    padding: 10px 15px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s;
}

#taskBtn:hover {
    background-color: #45a049;
}

/* Search container */
.search-container {
    margin-bottom: 15px;
}

#search-input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

/* Todo list */
#todo-list {
    list-style: none;
    margin-bottom: 20px;
}

#todo-list li {
    display: flex;
    align-items: center;
    padding: 12px;
    background-color: #f9f9f9;
    border-radius: 4px;
    margin-bottom: 8px;
    transition: background-color 0.2s;
    gap: 10px;
}

#todo-list li:hover {
    background-color: #f0f0f0;
}

/* Task content */
.task-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.task-text {
    font-size: 16px;
    word-break: break-word;
}

.task-date {
    font-size: 12px;
    color: #777;
    margin-top: 4px;
}

/* Task buttons */
.complete-btn, .delete-btn, .edit-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s;
}

.complete-btn {
    color: #4CAF50;
}

.delete-btn {
    color: #f44336;
}

.edit-btn {
    color: #2196F3;
}

.complete-btn:hover, .delete-btn:hover, .edit-btn:hover {
    transform: scale(1.2);
}

/* Priority button */
.priority-btn {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
}

.priority-btn.low {
    background-color: #8bc34a;
}

.priority-btn.normal {
    background-color: #ffc107;
}

.priority-btn.high {
    background-color: #f44336;
}

/* Completed task styling */
li.completed .task-text {
    text-decoration: line-through;
    color: #888;
}

/* Edit input field */
.edit-input {
    width: 100%;
    padding: 8px;
    border: 1px solid #4CAF50;
    border-radius: 4px;
    font-size: 16px;
}

/* Actions area */
.actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    padding-top: 15px;
    border-top: 1px solid #eee;
}

.task-count {
    color: #777;
    font-size: 14px;
}

.filters {
    display: flex;
    gap: 5px;
}

.filter-btn {
    background: none;
    border: 1px solid #ddd;
    border-radius: 3px;
    padding: 6px 12px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 14px;
}

.filter-btn:hover {
    border-color: #4CAF50;
}

.filter-btn.active {
    background-color: #4CAF50;
    color: white;
    border-color: #4CAF50;
}

#clear-completed {
    background-color: #f44336;
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 3px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
}

#clear-completed:hover {
    background-color: #e53935;
}

#theme-toggle {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    padding: 5px;
}

/* Dark theme */
.dark-theme {
    background-color: #333;
    color: #f5f5f5;
}

.dark-theme .container {
    background-color: #444;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.dark-theme h2 {
    color: #f5f5f5;
}

.dark-theme #_input,
.dark-theme #search-input,
.dark-theme .edit-input {
    background-color: #555;
    border-color: #666;
    color: #f5f5f5;
}

.dark-theme #todo-list li {
    background-color: #555;
    color: #f5f5f5;
}

.dark-theme #todo-list li:hover {
    background-color: #606060;
}

.dark-theme .task-date {
    color: #bbb;
}

.dark-theme .task-count {
    color: #bbb;
}

.dark-theme .filter-btn {
    border-color: #666;
    color: #f5f5f5;
}

.dark-theme .actions {
    border-color: #555;
}

.dark-theme li.completed .task-text {
    color: #999;
}

/* Responsive design */
@media (max-width: 500px) {
    .container {
        padding: 15px;
    }
    
    #todo-input {
        flex-direction: column;
    }
    
    #taskBtn {
        width: 100%;
    }
    
    .actions {
        flex-direction: column;
        align-items: center;
    }
    
    .filters {
        margin: 10px 0;
    }
}