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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

h1 {
    color: #333;
    margin-bottom: 10px;
    font-size: 28px;
}

.subtitle {
    color: #666;
    margin-bottom: 20px;
    font-size: 14px;
}

.api-status {
    background: #f0f0f0;
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 12px;
    color: #666;
}

.api-status.connected {
    background: #d4edda;
    color: #155724;
}

.add-form {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.add-form input {
    flex: 1;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.add-form input:focus {
    outline: none;
    border-color: #667eea;
}

.add-form button {
    padding: 12px 24px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: background 0.3s;
}

.add-form button:hover {
    background: #5a67d8;
}

.filter-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.filter-btn {
    padding: 8px 16px;
    background: #f0f0f0;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
}

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

.todo-list {
    list-style: none;
    margin-bottom: 20px;
}

.todo-item {
    display: flex;
    align-items: center;
    padding: 12px;
    background: #f8f9fa;
    border-radius: 10px;
    margin-bottom: 10px;
    transition: transform 0.2s;
}

.todo-item:hover {
    transform: translateX(5px);
}

.todo-item input[type="checkbox"] {
    margin-right: 15px;
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.todo-item .todo-text {
    flex: 1;
    font-size: 16px;
}

.todo-item.completed .todo-text {
    text-decoration: line-through;
    color: #999;
}

.todo-item button {
    background: #dc3545;
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    margin-left: 10px;
    transition: background 0.3s;
}

.todo-item button:hover {
    background: #c82333;
}

.stats {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
    color: #666;
    font-size: 14px;
}

.loading {
    text-align: center;
    padding: 40px;
    color: #666;
}